/* ============================================
   GUIA PROCESAL MERCANTIL - GLASSMORPHISM
   Mobile-first, frosted glass aesthetic
   ============================================ */

:root {
    --primary: #a78bfa;
    --primary-light: #c4b5fd;
    --primary-dark: #7c3aed;
    --gold: #fbbf24;
    --gold-dark: #d97706;
    --gold-light: rgba(251, 191, 36, 0.15);
    --bg-1: #0f0c29;
    --bg-2: #302b63;
    --bg-3: #24243e;
    --glass: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-strong: rgba(255, 255, 255, 0.12);
    --glass-hover: rgba(255, 255, 255, 0.18);
    --text: #f5f3ff;
    --text-secondary: #d0c8f0;
    --border: rgba(255, 255, 255, 0.1);
    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.15);
    --error: #f87171;
    --error-bg: rgba(248, 113, 113, 0.15);
    --partial: #fb923c;
    --partial-bg: rgba(251, 146, 60, 0.15);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.35);
    --radius: 16px;
    --radius-sm: 12px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --header-height: 64px;
    --blur: blur(20px);
    --blur-strong: blur(30px);
}

.dark-mode {
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-strong: rgba(255, 255, 255, 0.08);
    --glass-hover: rgba(255, 255, 255, 0.12);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-1);
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-1), var(--bg-2), var(--bg-3));
    background-attachment: fixed;
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    overscroll-behavior: none;
    -webkit-overflow-scrolling: touch;
    padding-bottom: env(safe-area-inset-bottom, 24px);
    padding-top: var(--header-height);
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Animated background orbs */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.35;
    z-index: 0;
    pointer-events: none;
    animation: floatOrb 12s ease-in-out infinite alternate;
}

body::before {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, #7c3aed, #4f46e5);
    top: -80px;
    right: -60px;
}

body::after {
    width: 280px;
    height: 280px;
    background: radial-gradient(circle, #ec4899, #8b5cf6);
    bottom: 100px;
    left: -80px;
    animation-delay: -6s;
    animation-duration: 15s;
}

/* Third orb */
#mainContent::before {
    content: '';
    position: fixed;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.2;
    z-index: 0;
    pointer-events: none;
    background: radial-gradient(circle, var(--gold), transparent 70%);
    bottom: 30%;
    right: -40px;
    animation: floatOrb 18s ease-in-out infinite alternate;
    animation-delay: -3s;
}

@keyframes floatOrb {
    0% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -20px) scale(1.1); }
    66% { transform: translate(-20px, 30px) scale(0.95); }
    100% { transform: translate(15px, 15px) scale(1.05); }
}

/* ============ HEADER ============ */
#appHeader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(15, 12, 41, 0.7);
    backdrop-filter: var(--blur-strong);
    -webkit-backdrop-filter: var(--blur-strong);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header-content {
    display: flex;
    flex-direction: column;
}

.app-title {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    background: linear-gradient(135deg, #fff, var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-subtitle {
    font-size: 0.68rem;
    opacity: 0.5;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    font-weight: 500;
}

.icon-btn {
    width: 42px;
    height: 42px;
    border: 1px solid var(--glass-border);
    background: var(--glass);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border-radius: 50%;
    color: var(--gold);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--glass-hover);
    transform: rotate(20deg);
}


/* ============ SCREENS ============ */
.screen {
    display: none;
    padding: 20px 16px;
    padding-bottom: 100px;
    animation: fadeIn 0.45s ease;
    position: relative;
    z-index: 1;
    max-width: 680px;
    margin: 0 auto;
    overflow-x: hidden;
    word-break: break-word;
    overflow-wrap: break-word;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); filter: blur(4px); }
    to { opacity: 1; transform: translateY(0); filter: blur(0); }
}

/* ============ HOME ============ */
.home-hero {
    text-align: center;
    padding: 32px 0 28px;
}

.hero-icon {
    font-size: 3.5rem;
    margin-bottom: 16px;
    filter: drop-shadow(0 0 24px rgba(167, 139, 250, 0.5));
    animation: gentlePulse 3s ease-in-out infinite;
    position: relative;
}

.hero-icon::before {
    content: '';
    position: absolute;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(167,139,250,0.15), transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
}

@keyframes gentlePulse {
    0%, 100% { transform: scale(1); filter: drop-shadow(0 0 20px rgba(167, 139, 250, 0.5)); }
    50% { transform: scale(1.06); filter: drop-shadow(0 0 30px rgba(167, 139, 250, 0.7)); }
}

.home-hero h2 {
    font-size: 1.6rem;
    background: linear-gradient(135deg, var(--primary-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.home-hero p {
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 420px;
    margin: 0 auto;
}

/* Compact subject header */
.subject-header {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 0 16px;
}

.subject-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(167,139,250,0.2), rgba(124,58,237,0.15));
    border: 1px solid rgba(167,139,250,0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--primary-light);
}

.subject-icon svg {
    width: 24px !important;
    height: 24px !important;
}

.subject-info h2 {
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--primary-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2px;
}

.subject-info p {
    color: var(--text-secondary);
    font-size: 0.78rem;
    line-height: 1.4;
}

.home-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    max-width: min(520px, 100%);
    margin: 0 auto;
}

.home-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.12), rgba(255,255,255,0.04));
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius);
    padding: 20px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 8px 32px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.1);
    text-align: center;
    position: relative;
    overflow: hidden;
    opacity: 0;
    animation: cardEntry 0.5s var(--bounce) forwards;
}

.home-card:nth-child(1) { animation-delay: 0.05s; }
.home-card:nth-child(2) { animation-delay: 0.10s; }
.home-card:nth-child(3) { animation-delay: 0.15s; }
.home-card:nth-child(4) { animation-delay: 0.20s; }
.home-card:nth-child(5) { animation-delay: 0.25s; }
.home-card:nth-child(6) { animation-delay: 0.30s; }

@keyframes cardEntry {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.home-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(167,139,250,0.6), rgba(251,191,36,0.4), transparent);
    opacity: 0;
    transition: var(--transition);
}

.home-card:hover::before,
.home-card:active::before {
    opacity: 1;
}

.home-card:hover, .home-card:active {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 16px 48px rgba(0,0,0,0.35), 0 0 30px rgba(167,139,250,0.08), inset 0 1px 0 rgba(255,255,255,0.15);
    border-color: rgba(255, 255, 255, 0.25);
    background: linear-gradient(145deg, rgba(255,255,255,0.18), rgba(255,255,255,0.08));
}

.home-card:active {
    transform: scale(0.97);
    transition-duration: 0.1s;
}

.card-icon {
    font-size: 2rem;
    color: #fff;
    filter: drop-shadow(0 2px 8px rgba(167, 139, 250, 0.4));
    transition: var(--transition);
}

.home-card:hover .card-icon {
    filter: drop-shadow(0 0 12px rgba(167, 139, 250, 0.6));
    transform: scale(1.1);
}

.card-label {
    font-weight: 700;
    font-size: 0.82rem;
    color: #fff;
    letter-spacing: -0.01em;
}

.card-desc {
    font-size: 0.68rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ============ SCREEN HEADER ============ */
.screen-header {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.screen-header h2 {
    font-size: 1.15rem;
    background: linear-gradient(135deg, var(--primary-light), #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex: 1;
}

.back-btn {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-sm);
    padding: 8px 16px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    color: #fff;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.back-btn:hover {
    background: var(--glass-hover);
    border-color: var(--primary-light);
}

.tool-btn {
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    border: none;
    border-radius: var(--radius-sm);
    padding: 7px 14px;
    font-size: 0.75rem;
    cursor: pointer;
    font-weight: 600;
    color: #1a1a2e;
    transition: var(--transition);
    box-shadow: 0 2px 10px rgba(251, 191, 36, 0.25);
}

.tool-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(251, 191, 36, 0.4);
}

.tool-btn-danger {
    background: linear-gradient(135deg, var(--error), #dc2626);
    color: #fff;
    box-shadow: 0 2px 10px rgba(248, 113, 113, 0.25);
}

.tool-btn-danger:hover {
    box-shadow: 0 4px 16px rgba(248, 113, 113, 0.4);
}

.study-tools {
    display: flex;
    gap: 6px;
}

/* ============ PROGRESS BAR ============ */
.progress-bar-container {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 3px;
    position: relative;
    margin-bottom: 16px;
    overflow: hidden;
}

.progress-bar-container.small {
    height: 4px;
    margin-bottom: 0;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--gold));
    border-radius: 3px;
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 10px rgba(167, 139, 250, 0.4);
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    font-size: 0.7rem;
    color: var(--text-secondary);
    position: absolute;
    right: 0;
    top: -18px;
}

/* ============ STUDY MODE ============ */
.study-content {
    max-width: 700px;
    margin: 0 auto;
}

.study-section {
    background: linear-gradient(160deg, var(--glass), rgba(255,255,255,0.03));
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    margin-bottom: 14px;
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.06);
    transition: var(--transition);
}

.study-section:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

.study-section.read {
    border-left: 3px solid var(--success);
}

.section-header {
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.section-header:hover {
    background: rgba(255, 255, 255, 0.04);
}

.section-header h3 {
    font-size: 0.95rem;
    color: var(--text);
    flex: 1;
    padding-right: 8px;
    letter-spacing: -0.01em;
}

.section-toggle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.study-section.open .section-toggle {
    transform: rotate(180deg);
}

.section-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.study-section.open .section-body {
    max-height: 3000px;
}

.section-content {
    padding: 0 16px 20px;
    font-size: 0.88rem;
    line-height: 1.75;
    color: rgba(255, 255, 255, 0.9);
}

.section-content h4 {
    color: var(--gold);
    margin: 14px 0 6px;
    font-size: 0.92rem;
    text-shadow: 0 0 12px rgba(251, 191, 36, 0.2);
}

.section-content ul {
    padding-left: 20px;
    margin: 6px 0;
}

.section-content li {
    margin-bottom: 5px;
}

.section-content li::marker {
    color: var(--primary-light);
}

.section-content .highlight-note {
    background: rgba(251, 191, 36, 0.08);
    border: 1px solid rgba(251, 191, 36, 0.15);
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--gold);
    margin: 12px 0;
    font-size: 0.85rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.read-check {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    color: transparent;
    transition: var(--transition);
    flex-shrink: 0;
    margin-left: 8px;
}

.study-section.read .read-check {
    background: var(--success);
    border-color: var(--success);
    color: #fff;
    box-shadow: 0 0 12px rgba(52, 211, 153, 0.4);
    animation: checkPop 0.3s var(--bounce);
}

@keyframes checkPop {
    from { transform: scale(0); }
    to { transform: scale(1); }
}

/* Sync status */
.sync-status {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    position: relative;
}

.sync-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-secondary);
    transition: background 0.3s;
}

.sync-status.online .sync-dot {
    background: var(--success);
    box-shadow: 0 0 8px rgba(52, 211, 153, 0.6);
}

.sync-status.offline .sync-dot {
    background: var(--error);
}

.sync-status.syncing .sync-dot {
    background: var(--gold);
    animation: syncPulse 1s infinite;
}

@keyframes syncPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* ============ FLASHCARDS ============ */
.flashcard-progress {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    gap: 12px;
}

.flashcard-area {
    perspective: 1200px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 280px;
    margin-bottom: 16px;
    touch-action: pan-y;
}

.flashcard {
    width: 100%;
    max-width: min(400px, 100%);
    height: 280px;
    cursor: pointer;
    position: relative;
}

.flashcard-inner {
    width: 100%;
    height: 100%;
    transition: transform 0.65s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    position: relative;
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
    text-align: center;
}

.flashcard-front {
    background: linear-gradient(145deg, rgba(124, 58, 237, 0.55), rgba(79, 70, 229, 0.35), rgba(124, 58, 237, 0.2));
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid rgba(167, 139, 250, 0.3);
    color: #fff;
    box-shadow: 0 16px 48px rgba(0,0,0,0.35), 0 0 40px rgba(124,58,237,0.12), inset 0 1px 0 rgba(255,255,255,0.15);
}

.flashcard-back {
    background: linear-gradient(145deg, rgba(251,191,36,0.12), rgba(255,255,255,0.08));
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid rgba(251, 191, 36, 0.3);
    color: var(--text);
    transform: rotateY(180deg);
    box-shadow: 0 16px 48px rgba(0,0,0,0.35), 0 0 30px rgba(251,191,36,0.08), inset 0 1px 0 rgba(255,255,255,0.12);
}

.fc-label {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.6;
    margin-bottom: 14px;
}

.fc-text {
    font-size: 0.95rem;
    line-height: 1.6;
}

.fc-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.nav-btn {
    padding: 12px 24px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    color: #fff;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    min-width: 44px;
    min-height: 44px;
}

.nav-btn:hover {
    background: var(--glass-hover);
    border-color: var(--primary-light);
}

.nav-btn.primary {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: #fff;
    border: 1px solid rgba(167, 139, 250, 0.4);
    box-shadow: 0 4px 16px rgba(124, 58, 237, 0.3);
}

.nav-btn.primary:hover {
    box-shadow: 0 6px 24px rgba(124, 58, 237, 0.5);
    transform: translateY(-1px);
}

.correct-btn {
    background: linear-gradient(135deg, #059669, var(--success)) !important;
    color: #fff !important;
    border: 1px solid rgba(52, 211, 153, 0.4) !important;
    box-shadow: 0 4px 16px rgba(52, 211, 153, 0.25) !important;
}

.incorrect-btn {
    background: linear-gradient(135deg, #dc2626, var(--error)) !important;
    color: #fff !important;
    border: 1px solid rgba(248, 113, 113, 0.4) !important;
    box-shadow: 0 4px 16px rgba(248, 113, 113, 0.25) !important;
}

/* ============ EXAM SETUP ============ */
.exam-setup {
    text-align: center;
    padding: 40px 0;
    max-width: min(400px, 100%);
    margin: 0 auto;
}

.exam-setup h3 {
    color: var(--primary-light);
    margin-bottom: 8px;
}

.exam-setup p {
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 24px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.btn-primary {
    display: inline-block;
    padding: 14px 34px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--primary-dark));
    background-size: 200% auto;
    color: #fff;
    border: 1px solid rgba(167, 139, 250, 0.3);
    border-radius: 14px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    min-height: 44px;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.35), inset 0 1px 0 rgba(255,255,255,0.15);
    position: relative;
    overflow: hidden;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(124, 58, 237, 0.5);
    background-position: right center;
}

.btn-secondary {
    display: inline-block;
    padding: 12px 28px;
    background: var(--glass);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    color: var(--primary-light);
    border: 1px solid rgba(167,139,250,0.4);
    border-radius: 14px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    min-height: 44px;
    margin-top: 12px;
    box-shadow: 0 2px 12px rgba(124,58,237,0.1);
}

.btn-secondary:hover {
    background: var(--primary-dark);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.3);
}

.score-badge {
    background: rgba(251, 191, 36, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(251, 191, 36, 0.25);
    color: var(--gold);
    padding: 5px 14px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.8rem;
}

/* ============ MULTIPLE CHOICE ============ */
.mc-question-card {
    background: linear-gradient(160deg, rgba(255,255,255,0.1), rgba(255,255,255,0.03));
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 24px 20px;
    margin-bottom: 16px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.08);
}

.mc-question {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 18px;
    line-height: 1.5;
    color: #fff;
    letter-spacing: -0.01em;
}

.mc-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mc-option {
    padding: 14px 16px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-left: 3px solid transparent;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    font-size: 0.88rem;
    text-align: left;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    line-height: 1.4;
    min-height: 44px;
    color: rgba(255, 255, 255, 0.92);
    word-break: break-word;
    overflow-wrap: break-word;
}

.mc-option:hover {
    border-color: rgba(167, 139, 250, 0.3);
    border-left-color: var(--primary-light);
    background: rgba(167, 139, 250, 0.08);
    transform: translateX(2px);
}

.mc-option.selected {
    border-color: var(--primary);
    background: rgba(167, 139, 250, 0.12);
}

.mc-option.correct {
    border-color: var(--success);
    border-left-color: var(--success);
    background: var(--success-bg);
    color: var(--success);
    box-shadow: 0 0 15px rgba(52, 211, 153, 0.15);
    animation: correctPulse 0.4s ease;
}

@keyframes correctPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.mc-option.incorrect {
    border-color: var(--error);
    border-left-color: var(--error);
    background: var(--error-bg);
    color: var(--error);
    box-shadow: 0 0 15px rgba(248, 113, 113, 0.15);
    animation: shake 0.4s ease;
}

.mc-option.disabled {
    pointer-events: none;
    opacity: 0.6;
}

.mc-option.disabled.correct {
    opacity: 1;
}

/* ============ EXAM RESULTS ============ */
.exam-results {
    text-align: center;
    padding: 32px 0;
    max-width: min(500px, 100%);
    margin: 0 auto;
}

.exam-results h3 {
    font-size: 1.3rem;
    background: linear-gradient(135deg, var(--primary-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
}

.result-circle {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border: 3px solid rgba(251, 191, 36, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    background: var(--glass);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    box-shadow: 0 0 40px rgba(251, 191, 36, 0.15), var(--shadow-lg);
    position: relative;
}

.result-circle::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: conic-gradient(var(--gold), var(--primary), var(--gold));
    z-index: -1;
    opacity: 0.3;
    animation: rotateGlow 4s linear infinite;
}

@keyframes rotateGlow {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.result-circle span {
    font-size: 2.4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.exam-results p {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 20px;
}

.mc-review {
    text-align: left;
    margin-top: 20px;
}

.review-item {
    background: var(--glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 14px;
    margin-bottom: 10px;
    border-left: 3px solid var(--error);
}

.review-item .review-q {
    font-weight: 600;
    font-size: 0.88rem;
    margin-bottom: 6px;
}

.review-item .review-a {
    font-size: 0.82rem;
    color: var(--success);
}

/* ============ OPEN-ENDED ============ */
.oe-textarea {
    width: 100%;
    min-height: 140px;
    padding: 14px 16px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 12px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text);
    transition: var(--transition);
    line-height: 1.7;
}

.oe-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1), 0 0 0 3px rgba(167,139,250,0.12);
}

.oe-textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.oe-correct {
    margin-top: 16px;
    padding: 16px;
    background: var(--success-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--success);
    text-align: left;
}

.oe-correct-label {
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--success);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.oe-correct p {
    font-size: 0.88rem;
    line-height: 1.5;
    color: var(--text);
}

.oe-self-eval {
    margin-top: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.oe-self-eval p {
    width: 100%;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 4px;
    color: var(--text);
}

.eval-btn {
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    min-height: 44px;
    transition: var(--transition);
    color: #fff;
}

.eval-btn:hover {
    transform: translateY(-1px);
}

.eval-correct {
    background: linear-gradient(135deg, #059669, var(--success));
    box-shadow: 0 4px 12px rgba(52, 211, 153, 0.3);
}

.eval-partial {
    background: linear-gradient(135deg, #ea580c, var(--partial));
    box-shadow: 0 4px 12px rgba(251, 146, 60, 0.3);
}

.eval-wrong {
    background: linear-gradient(135deg, #dc2626, var(--error));
    box-shadow: 0 4px 12px rgba(248, 113, 113, 0.3);
}

/* ============ COLLABORATIVE ============ */
.collab-inputs {
    display: flex;
    gap: 12px;
    margin: 20px 0;
    justify-content: center;
    flex-wrap: wrap;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.input-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-group input {
    padding: 10px 14px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    text-align: center;
    width: 140px;
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text);
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 12px rgba(167, 139, 250, 0.2);
}

.collab-scoreboard {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.player-score {
    text-align: center;
    padding: 14px 22px;
    border-radius: var(--radius);
    background: var(--glass);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--glass-border);
    min-width: 110px;
    transition: var(--transition);
}

.player-score.active-player {
    border-color: rgba(251, 191, 36, 0.4);
    box-shadow: 0 0 20px rgba(251, 191, 36, 0.2), 0 0 40px rgba(251, 191, 36, 0.08);
    background: rgba(251, 191, 36, 0.08);
}

.player-name {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.player-points {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.vs-badge {
    font-weight: 800;
    font-size: 1rem;
    color: var(--gold);
    text-shadow: 0 0 10px rgba(251, 191, 36, 0.4);
}

.collab-turn {
    text-align: center;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.collab-turn span:first-child {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--primary-light);
}

.collab-turn span:last-child {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.collab-final-scores {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.final-player {
    text-align: center;
}

.final-player span:first-child {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.final-score {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.final-vs {
    font-weight: 800;
    color: var(--gold);
    text-shadow: 0 0 10px rgba(251, 191, 36, 0.4);
}

.winner-text {
    font-size: 1.2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gold), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 400px) {
    .screen {
        padding: 16px 12px;
    }
    .home-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    .home-card {
        padding: 16px 10px;
    }
    .card-icon svg {
        width: 26px;
        height: 26px;
    }
    .flashcard {
        height: 240px;
    }
    .guide-card {
        padding: 16px 14px;
        gap: 14px;
    }
    .guide-card-icon {
        width: 44px;
        height: 44px;
    }
    .guide-card-name {
        font-size: 0.95rem;
    }
    .mc-question-card {
        padding: 18px 14px;
    }
    .mp-menu-card {
        padding: 18px 12px;
    }
    .catalog-item {
        padding: 12px;
        gap: 12px;
    }
}

@media (min-width: 600px) {
    .home-grid {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 16px;
    }

    .flashcard {
        height: 320px;
    }

    .home-hero h2 {
        font-size: 2rem;
    }

    body::before {
        width: 400px;
        height: 400px;
    }

    body::after {
        width: 350px;
        height: 350px;
    }

    #authScreen.active {
        justify-content: center;
        padding-top: 0;
    }
    .auth-logo {
        width: 88px;
        height: 88px;
        margin-bottom: 20px;
    }
    .auth-logo-inner svg {
        width: 40px;
        height: 40px;
    }
    .auth-title {
        font-size: 2rem;
    }
    .auth-tagline {
        font-size: 0.92rem;
        margin-bottom: 20px;
    }
    .auth-splash {
        margin-bottom: 32px;
    }
    .auth-card {
        padding: 28px 24px 32px;
    }

    .mc-question-card {
        padding: 28px;
    }

    .catalog-grid {
        max-width: 600px;
        margin: 0 auto;
    }
}

@media (min-width: 768px) {
    .home-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 18px;
        max-width: 600px;
    }
}

@media (min-width: 900px) {
    :root {
        --header-height: 68px;
    }

    .home-hero {
        padding: 48px 0 36px;
    }

    .home-hero h2 {
        font-size: 2.5rem;
    }

    .screen {
        padding: 28px 24px;
        padding-bottom: 100px;
        max-width: 720px;
    }

    body::before {
        width: 500px;
        height: 500px;
        opacity: 0.3;
    }

    body::after {
        width: 400px;
        height: 400px;
        opacity: 0.3;
    }
}

/* ============ ANIMATIONS ============ */
@keyframes slideIn {
    from { transform: translateX(20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.pulse {
    animation: pulse 0.4s ease;
}

/* Swipe hint */
.swipe-hint {
    text-align: center;
    font-size: 0.72rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    opacity: 0.5;
}

/* ============ FLOATING HOME BUTTON ============ */
.floating-home {
    position: fixed;
    bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    right: 20px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    backdrop-filter: blur(12px);
    border: 1px solid rgba(167, 139, 250, 0.4);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 99;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.5), 0 0 40px rgba(124, 58, 237, 0.15);
    transition: var(--transition);
    -webkit-tap-highlight-color: transparent;
}

.floating-home:hover,
.floating-home:active {
    transform: scale(1.1);
    box-shadow: 0 6px 28px rgba(124, 58, 237, 0.6), 0 0 50px rgba(124, 58, 237, 0.2);
}

/* ============ GUIDE SELECTOR ============ */
.guide-search {
    position: relative;
    margin-bottom: 14px;
}

.guide-scroll {
    min-height: 40vh;
    max-height: 40vh;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    border-radius: 16px;
    padding: 10px;
    background: linear-gradient(160deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: inset 0 2px 8px rgba(0,0,0,0.2);
}

.guide-scroll::-webkit-scrollbar {
    width: 4px;
}

.guide-scroll::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.03);
    border-radius: 2px;
}

.guide-scroll::-webkit-scrollbar-thumb {
    background: rgba(167,139,250,0.3);
    border-radius: 2px;
}

.guide-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}

.guide-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.12), rgba(255,255,255,0.04));
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.08);
    position: relative;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
    opacity: 0;
    animation: slideEntry 0.4s ease forwards;
}

.guide-card:nth-child(1) { animation-delay: 0.05s; }
.guide-card:nth-child(2) { animation-delay: 0.12s; }
.guide-card:nth-child(3) { animation-delay: 0.19s; }
.guide-card:nth-child(4) { animation-delay: 0.26s; }

@keyframes slideEntry {
    from { opacity: 0; transform: translateX(-12px); }
    to { opacity: 1; transform: translateX(0); }
}

.guide-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--guide-accent, var(--primary)), transparent);
    opacity: 0.7;
    transition: var(--transition);
}

.guide-card:hover::before,
.guide-card:active::before {
    opacity: 1;
}

.guide-card:hover,
.guide-card:active {
    transform: translateY(-3px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.35);
    background: rgba(255, 255, 255, 0.20);
}

.guide-card-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: var(--guide-accent-bg, rgba(167, 139, 250, 0.15));
    border: 1px solid var(--guide-accent-border, rgba(167, 139, 250, 0.25));
    color: var(--guide-accent, var(--primary-light));
}

.guide-card-info {
    flex: 1;
    min-width: 0;
}

.guide-card-name {
    font-size: clamp(0.82rem, 3.5vw, 0.95rem);
    font-weight: 700;
    color: #fff;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.guide-card-desc {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.4;
}

.guide-card-meta {
    font-size: 0.72rem;
    color: rgba(255,255,255,0.4);
    margin-top: 2px;
}

.guide-card-arrow {
    flex-shrink: 0;
    color: rgba(255, 255, 255, 0.3);
    transition: var(--transition);
}

.guide-card:hover .guide-card-arrow {
    color: rgba(255, 255, 255, 0.7);
    transform: translateX(4px);
}

/* Back to guides button */
.back-guides-btn {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-sm);
    padding: 7px 14px;
    font-size: 0.8rem;
    cursor: pointer;
    color: var(--gold);
    transition: var(--transition);
    margin-left: auto;
}

.back-guides-btn:hover {
    background: var(--glass-hover);
    border-color: var(--gold);
}

/* ============ SCROLLBAR ============ */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(167, 139, 250, 0.3);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(167, 139, 250, 0.5);
}

/* ============ MASTERY MODE ============ */

.mastery-block-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 4px 0;
}

.mastery-block {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    background: linear-gradient(145deg, var(--glass-strong), rgba(255,255,255,0.04));
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    backdrop-filter: blur(12px);
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.mastery-block:hover:not(.locked) {
    background: var(--glass-hover);
    transform: translateY(-1px);
}

.mastery-block.locked {
    opacity: 0.45;
    cursor: not-allowed;
    filter: grayscale(0.3);
}

.mastery-block.mastered {
    border-color: var(--gold);
    background: rgba(251, 191, 36, 0.08);
}

.mastery-block.mastered::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, transparent 60%, rgba(251, 191, 36, 0.06));
    pointer-events: none;
}

.mastery-block-num {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
    background: var(--glass);
    color: var(--text-secondary);
    border: 2px solid var(--glass-border);
}

.mastery-block.mastered .mastery-block-num {
    background: var(--gold);
    color: #1a1a2e;
    border-color: var(--gold);
}

.mastery-block.current .mastery-block-num {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    animation: pulse-ring 2s ease-in-out infinite;
}

@keyframes pulse-ring {
    0%, 100% { box-shadow: 0 0 0 0 rgba(167, 139, 250, 0.4); }
    50% { box-shadow: 0 0 0 6px rgba(167, 139, 250, 0); }
}

.mastery-block-info {
    flex: 1;
    min-width: 0;
}

.mastery-block-title {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mastery-block-subtitle {
    font-size: 0.72rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.mastery-block-status {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.mastery-block .lock-icon {
    color: var(--text-secondary);
    opacity: 0.5;
}

.mastery-block .star-icon {
    color: var(--gold);
}

.mastery-block .arrow-icon {
    color: var(--primary-light);
}

/* Quiz area */
.mastery-quiz-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.mastery-quiz-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.mastery-block-name {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mastery-progress-text {
    font-size: 0.72rem;
    color: var(--text-secondary);
}

.mastery-lives-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: var(--glass);
    border-radius: 10px;
    margin-bottom: 16px;
    font-size: 0.78rem;
}

.mastery-streak {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--gold);
    font-weight: 600;
}

.mastery-remaining {
    color: var(--text-secondary);
}

.mastery-card {
    transition: transform 0.3s, opacity 0.3s;
}

.mastery-card.shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-8px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-6px); }
    80% { transform: translateX(4px); }
}

.mastery-card.correct-flash {
    animation: correct-glow 0.6s ease;
}

@keyframes correct-glow {
    0% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
    50% { box-shadow: 0 0 20px 4px rgba(34, 197, 94, 0.3); }
    100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

/* Feedback */
.mastery-feedback {
    margin-top: 12px;
    padding: 14px 16px;
    border-radius: 12px;
    font-size: 0.85rem;
    line-height: 1.5;
    animation: fadeSlideUp 0.3s ease;
}

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.mastery-feedback.correct {
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #86efac;
}

.mastery-feedback.incorrect {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.mastery-feedback .feedback-title {
    font-weight: 700;
    margin-bottom: 4px;
    font-size: 0.9rem;
}

.mastery-feedback .feedback-answer {
    color: var(--text);
    font-size: 0.82rem;
}

.mastery-feedback .mastery-continue-btn {
    display: inline-block;
    margin-top: 10px;
    padding: 8px 20px;
    background: var(--glass-strong);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.82rem;
    cursor: pointer;
    transition: background 0.2s;
}

.mastery-feedback .mastery-continue-btn:hover {
    background: var(--glass-hover);
}

/* Flashcard in mastery */
.mastery-fc-area {
    margin-bottom: 12px;
}

.mastery-fc-question {
    font-size: 1rem;
    color: var(--text);
    font-weight: 600;
    margin-bottom: 16px;
    line-height: 1.5;
}

.mastery-fc-answer-area {
    padding: 14px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    margin-bottom: 12px;
    display: none;
}

.mastery-fc-answer-area.revealed {
    display: block;
    animation: fadeSlideUp 0.3s ease;
}

.mastery-fc-answer-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary-light);
    margin-bottom: 6px;
}

.mastery-fc-answer-text {
    color: var(--text);
    font-size: 0.88rem;
    line-height: 1.5;
}

.mastery-fc-controls {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.mastery-fc-controls .nav-btn {
    flex: 1;
    max-width: 160px;
}

/* Celebration */
.mastery-celebration {
    text-align: center;
    padding: 24px 0;
    position: relative;
}

.mastery-celebration::before {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(251,191,36,0.15), transparent 70%);
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
}

.mastery-star-burst {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    animation: star-pop 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes star-pop {
    0% { transform: scale(0) rotate(-30deg); opacity: 0; }
    60% { transform: scale(1.2) rotate(5deg); }
    100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

.mastery-celebration h3 {
    font-size: 1.4rem;
    color: var(--gold);
    margin-bottom: 8px;
}

.mastery-celebration p {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

/* All mastered state */
.mastery-all-done {
    text-align: center;
    padding: 40px 0;
}

.mastery-all-done h3 {
    font-size: 1.3rem;
    color: var(--gold);
    margin: 16px 0 8px;
}

.mastery-all-done p {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

/* ============ MULTIPLAYER ONLINE ============ */

.mp-entry-section {
    margin-top: 12px;
    padding-top: 0;
}

.mp-entry-btn {
    display: flex;
    align-items: center;
    gap: 14px;
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.12), rgba(167, 139, 250, 0.12));
    border: 1px solid rgba(96, 165, 250, 0.3);
    border-radius: 16px;
    backdrop-filter: blur(12px);
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    color: var(--text);
}

.mp-entry-btn:hover {
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.2), rgba(167, 139, 250, 0.2));
    transform: translateY(-1px);
}

.mp-entry-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(96, 165, 250, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #60a5fa;
    flex-shrink: 0;
}

.mp-entry-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mp-entry-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text);
}

.mp-entry-desc {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

/* MP Hero */
.mp-hero {
    text-align: center;
    padding: 16px 0 24px;
}

.mp-hero-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(145deg, rgba(96,165,250,0.2), rgba(167,139,250,0.15));
    border: 1px solid rgba(96,165,250,0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    color: #60a5fa;
    animation: gentlePulse 3s ease-in-out infinite;
}

.mp-hero-title {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #60a5fa, var(--primary-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}

.mp-hero-sub {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* MP Action Buttons */
.mp-menu-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 20px 0;
}

.mp-action-btn {
    display: flex;
    align-items: center;
    gap: 14px;
    width: 100%;
    padding: 16px;
    background: linear-gradient(145deg, rgba(255,255,255,0.1), rgba(255,255,255,0.04));
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 14px;
    backdrop-filter: blur(12px);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
    color: var(--text);
    position: relative;
    overflow: hidden;
}

.mp-action-btn::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(96,165,250,0.4), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.mp-action-btn:hover::before { opacity: 1; }

.mp-action-btn:hover {
    background: linear-gradient(145deg, rgba(255,255,255,0.16), rgba(255,255,255,0.08));
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.3), 0 0 20px rgba(96,165,250,0.06);
}

.mp-action-btn:active {
    transform: scale(0.98);
    transition-duration: 0.1s;
}

.mp-action-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(96,165,250,0.2), rgba(167,139,250,0.15));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #60a5fa;
    flex-shrink: 0;
}

.mp-action-icon.mp-join-icon {
    background: linear-gradient(135deg, rgba(52,211,153,0.2), rgba(96,165,250,0.15));
    color: #34d399;
}

.mp-action-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mp-action-title {
    font-weight: 700;
    font-size: 0.95rem;
}

.mp-action-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.mp-action-arrow {
    flex-shrink: 0;
    color: rgba(255,255,255,0.2);
    transition: all 0.25s;
}

.mp-action-btn:hover .mp-action-arrow {
    color: rgba(255,255,255,0.5);
    transform: translateX(3px);
}

/* Menu */
.mp-name-input {
    margin: 0 0 4px;
}

.mp-name-input label {
    display: block;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.mp-name-input input {
    width: 100%;
    padding: 10px 14px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--text);
    font-size: 0.92rem;
    outline: none;
    transition: border-color 0.2s;
    box-sizing: border-box;
}

.mp-name-input input:focus {
    border-color: var(--primary);
}

.mp-menu-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 16px 0;
}

.mp-menu-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 24px 16px;
    background: linear-gradient(145deg, var(--glass-strong), rgba(255,255,255,0.04));
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    backdrop-filter: blur(12px);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    color: var(--text);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.06);
}

.mp-menu-card:hover {
    background: var(--glass-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3), 0 0 20px rgba(167,139,250,0.06);
}

.mp-menu-card-icon {
    color: var(--primary-light);
}

.mp-menu-card-title {
    font-weight: 700;
    font-size: 0.92rem;
}

.mp-menu-card-desc {
    font-size: 0.72rem;
    color: var(--text-secondary);
}

.mp-join-area {
    margin: 16px 0;
}

.mp-join-area label {
    display: block;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.mp-code-input-row {
    display: flex;
    gap: 10px;
}

.mp-code-input-row input {
    flex: 1;
    padding: 10px 14px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--text);
    font-size: 1.1rem;
    font-family: monospace;
    letter-spacing: 0.15em;
    outline: none;
    text-transform: uppercase;
}

.mp-code-input-row input:focus {
    border-color: var(--primary);
}

.mp-error {
    color: #f87171;
    font-size: 0.82rem;
    margin-top: 8px;
}

/* Lobby */
.mp-room-code-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    background: var(--glass-strong);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    margin: 12px 0;
}

.mp-room-code-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.mp-room-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: clamp(1.1rem, 4vw, 1.6rem);
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--primary-light);
    text-shadow: 0 0 20px rgba(167,139,250,0.4);
}

.mp-copy-btn {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 6px 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.mp-copy-btn:hover {
    background: var(--glass-hover);
    color: var(--text);
}

.mp-section-title {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin: 16px 0 10px;
    font-weight: 600;
}

.mp-player-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mp-player-chip {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
}

.mp-player-chip.is-leader {
    border-color: var(--gold);
    background: rgba(251, 191, 36, 0.06);
}

.mp-player-chip.is-me {
    border-color: var(--primary);
    background: rgba(167, 139, 250, 0.08);
}

.mp-player-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--glass-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.82rem;
    color: var(--primary-light);
    flex-shrink: 0;
}

.mp-player-chip.is-leader .mp-player-avatar {
    background: var(--gold);
    color: #1a1a2e;
}

.mp-player-name {
    flex: 1;
    font-size: 0.88rem;
    color: var(--text);
    font-weight: 500;
}

.mp-player-badge {
    font-size: 0.68rem;
    padding: 2px 8px;
    border-radius: 6px;
    font-weight: 600;
}

.mp-player-badge.leader {
    background: rgba(251, 191, 36, 0.15);
    color: var(--gold);
}

.mp-player-badge.you {
    background: rgba(167, 139, 250, 0.15);
    color: var(--primary-light);
}

.mp-config-panel {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mp-config-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.mp-config-row label {
    font-size: 0.82rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.mp-select {
    padding: 8px 12px;
    background: var(--glass-strong);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.82rem;
    outline: none;
    max-width: 200px;
    cursor: pointer;
}

.mp-select option {
    background: #1a1a2e;
    color: var(--text);
}

.mp-config-summary {
    font-size: 0.85rem;
    color: var(--text);
    line-height: 1.6;
}

.mp-start-btn {
    width: 100%;
    margin-top: 16px;
    padding: 14px;
    font-size: 1rem;
}

.mp-lobby-status {
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-top: 12px;
}

/* Game scoreboard */
.mp-game-scoreboard {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 4px 0 12px;
    -webkit-overflow-scrolling: touch;
}

.mp-score-card {
    flex: 0 0 auto;
    min-width: 72px;
    padding: 10px 12px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.mp-score-card.active-turn {
    border-color: var(--primary);
    background: rgba(167, 139, 250, 0.12);
    box-shadow: 0 4px 20px rgba(167,139,250,0.25);
}

.mp-score-card.is-me {
    border-color: var(--primary-light);
}

.mp-score-name {
    font-size: 0.7rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 70px;
}

.mp-score-points {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
    margin-top: 2px;
}

/* Turn indicator */
.mp-turn-indicator {
    text-align: center;
    padding: 10px;
    margin-bottom: 12px;
    background: rgba(167, 139, 250, 0.1);
    border: 1px solid rgba(167, 139, 250, 0.2);
    border-radius: 10px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--primary-light);
}

/* Timer */
.mp-timer-container {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.mp-timer-bar {
    flex: 1;
    height: 6px;
    background: var(--glass);
    border-radius: 3px;
    overflow: hidden;
}

.mp-timer-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--gold));
    border-radius: 3px;
    transition: width 0.1s linear;
    width: 100%;
}

.mp-timer-fill.urgent {
    background: linear-gradient(90deg, #ef4444, #f97316);
}

.mp-timer-text {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    min-width: 32px;
    text-align: center;
}

.mp-timer-text.urgent {
    color: #f87171;
}

/* Spectator message */
.mp-spectator-msg {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    background: var(--glass);
    border-radius: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 12px;
}

/* Round result overlay */
.mp-round-result {
    margin-top: 12px;
    padding: 14px;
    background: var(--glass-strong);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    animation: fadeSlideUp 0.3s ease;
}

/* Results screen */
.mp-results-header {
    text-align: center;
    padding: 20px 0 24px;
}

.mp-results-trophy {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    animation: star-pop 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.mp-trophy-glow {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(251,191,36,0.25), transparent 70%);
    animation: gentlePulse 2s ease-in-out infinite;
}

.mp-results-title {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.mp-winner-text {
    font-size: 1.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--gold), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mp-rank-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.mp-rank-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
}

.mp-rank-item:first-child {
    background: rgba(251, 191, 36, 0.1);
    border-color: var(--gold);
}

.mp-rank-position {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--glass-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.mp-rank-item:first-child .mp-rank-position {
    background: var(--gold);
    color: #1a1a2e;
}

.mp-rank-item:nth-child(2) .mp-rank-position {
    background: #94a3b8;
    color: #1a1a2e;
}

.mp-rank-item:nth-child(3) .mp-rank-position {
    background: #b45309;
    color: #fff;
}

.mp-rank-name {
    flex: 1;
    font-size: 0.9rem;
    color: var(--text);
    font-weight: 500;
}

.mp-rank-score {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-light);
}

.mp-rank-item:first-child .mp-rank-score {
    color: var(--gold);
}

.mp-results-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Waiting for answer indicator */
.mp-waiting-answer {
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-align: center;
    margin-top: 8px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* ============ UNIT SELECTOR ============ */
.unit-selector {
    display: flex;
    gap: 8px;
    padding: 0 0 16px;
    justify-content: center;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.unit-selector::-webkit-scrollbar {
    display: none;
}

.unit-chip {
    flex-shrink: 0;
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.06);
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.unit-chip:hover {
    background: rgba(255,255,255,0.1);
}

.unit-chip.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 2px 16px rgba(124, 58, 237, 0.4);
    transform: scale(1.05);
}

.home-grid.unit-transition {
    animation: unitSwap 0.35s ease;
}

@keyframes unitSwap {
    0% { opacity: 1; transform: translateY(0); }
    40% { opacity: 0; transform: translateY(-8px); }
    60% { opacity: 0; transform: translateY(8px); }
    100% { opacity: 1; transform: translateY(0); }
}

/* ============ CATALOG ============ */
/* ============ SELECTOR HEADER ============ */
.selector-header {
    padding: 28px 0 20px;
    text-align: center;
}

.selector-header h2 {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--primary-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}

.selector-header p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ============ EMPTY STATE ============ */
.empty-state {
    text-align: center;
    padding: 24px 16px;
    animation: fadeIn 0.5s ease;
}

.empty-state-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
    border: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    color: rgba(255,255,255,0.25);
}

.empty-state h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 0.82rem;
    line-height: 1.5;
    max-width: 260px;
    margin: 0 auto 16px;
}

.empty-state-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.88rem;
}

/* ============ SELECTOR ACTIONS ============ */
.selector-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 24px;
}

.action-card {
    display: flex;
    align-items: center;
    gap: 14px;
    width: 100%;
    padding: 14px 16px;
    background: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.03));
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 14px;
    backdrop-filter: blur(12px);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
    color: var(--text);
}

.action-card:hover {
    background: linear-gradient(145deg, rgba(255,255,255,0.14), rgba(255,255,255,0.06));
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.25);
}

.action-card:active {
    transform: scale(0.98);
    transition-duration: 0.1s;
}

.action-card-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.action-card-icon.catalog-icon {
    background: rgba(167, 139, 250, 0.15);
    color: var(--primary-light);
}

.action-card-icon.mp-icon {
    background: rgba(96, 165, 250, 0.15);
    color: #60a5fa;
}

.action-card-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}

.action-card-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
}

.action-card-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.action-card-arrow {
    flex-shrink: 0;
    color: rgba(255,255,255,0.2);
    transition: all 0.25s;
}

.action-card:hover .action-card-arrow {
    color: rgba(255,255,255,0.5);
    transform: translateX(3px);
}

/* ============ LOADING OVERLAY ============ */
.loading-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: linear-gradient(135deg, var(--bg-1), var(--bg-2), var(--bg-3));
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease;
}

.loading-overlay.visible {
    display: flex;
}

.loading-overlay.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    animation: fadeIn 0.4s ease;
}

.loading-logo {
    position: relative;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-logo-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.06);
    border-top-color: var(--primary);
    border-right-color: var(--gold);
    animation: spinnerRotate 1s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes spinnerRotate {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.loading-dots {
    display: flex;
    gap: 6px;
}

.loading-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
    animation: dotBounce 1.2s ease-in-out infinite;
}

.loading-dots span:nth-child(2) { animation-delay: 0.15s; }
.loading-dots span:nth-child(3) { animation-delay: 0.3s; }

@keyframes dotBounce {
    0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
    40% { opacity: 1; transform: scale(1.2); }
}

/* Mini loading for buttons */
.btn-loading {
    position: relative;
    pointer-events: none;
    color: transparent !important;
}

.btn-loading * {
    visibility: hidden;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    top: calc(50% - 9px);
    left: calc(50% - 9px);
    border: 2px solid rgba(255,255,255,0.2);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spinnerRotate 0.6s linear infinite;
}

/* ============ CATALOG ============ */

.catalog-header {
    text-align: center;
    padding: 12px 0 20px;
}

.catalog-header h2 {
    color: #fff;
    font-size: 1.3rem;
    margin: 0 0 4px;
}

.catalog-header p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin: 0;
}

/* Catalog search */
.catalog-search {
    position: relative;
    margin-bottom: 14px;
}

.catalog-search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: rgba(255,255,255,0.3);
    pointer-events: none;
}

.catalog-search-input {
    width: 100%;
    padding: 11px 14px 11px 40px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 12px;
    background: rgba(255,255,255,0.06);
    color: #fff;
    font-size: 0.88rem;
    outline: none;
    transition: all 0.3s;
    box-sizing: border-box;
}

.catalog-search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(167,139,250,0.12);
    background: rgba(255,255,255,0.08);
}

.catalog-search-input::placeholder {
    color: rgba(255,255,255,0.3);
}

/* Catalog scroll container */
.catalog-scroll {
    min-height: 45vh;
    max-height: 45vh;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    border-radius: 16px;
    padding: 12px;
    background: linear-gradient(160deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: inset 0 2px 8px rgba(0,0,0,0.2);
}

.catalog-scroll::-webkit-scrollbar {
    width: 4px;
}

.catalog-scroll::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.03);
    border-radius: 2px;
}

.catalog-scroll::-webkit-scrollbar-thumb {
    background: rgba(167,139,250,0.3);
    border-radius: 2px;
}

.catalog-no-results {
    text-align: center;
    padding: 32px 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.catalog-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    padding-bottom: 12px;
}

.catalog-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    border-radius: 14px;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.15);
    transition: all 0.3s;
}

.catalog-item.added {
    border-color: rgba(52, 211, 153, 0.4);
    background: rgba(52, 211, 153, 0.08);
}

.catalog-item-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.5rem;
}

.catalog-item-info {
    flex: 1;
    min-width: 0;
}

.catalog-item-name {
    display: block;
    color: #fff;
    font-weight: 600;
    font-size: clamp(0.82rem, 3.5vw, 0.92rem);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.catalog-item-desc {
    display: block;
    color: var(--text-secondary);
    font-size: 0.78rem;
    margin-top: 2px;
}

.catalog-item-meta {
    display: flex;
    gap: 8px;
    margin-top: 6px;
    flex-wrap: wrap;
}

.catalog-meta-tag {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 20px;
    background: rgba(255,255,255,0.1);
    color: var(--text-secondary);
}

.catalog-toggle-btn {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.06);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
}

.catalog-toggle-btn:hover {
    background: rgba(255,255,255,0.12);
}

.catalog-toggle-btn.added {
    background: rgba(52, 211, 153, 0.2);
    border-color: #34d399;
    color: #34d399;
}

.catalog-toggle-btn.remove {
    background: rgba(248, 113, 113, 0.15);
    border-color: rgba(248, 113, 113, 0.4);
    color: #f87171;
}

/* ============ AUTH SCREEN ============ */
#authScreen {
    display: none;
    padding: 0 16px 24px;
    overflow-x: hidden;
}
#authScreen.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: calc(100vh - var(--header-height));
    min-height: calc(100dvh - var(--header-height));
    padding-top: 12px;
}

/* Splash hero */
.auth-splash {
    text-align: center;
    margin-bottom: 16px;
    animation: authFadeDown 0.6s ease;
}

@keyframes authFadeDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-logo {
    position: relative;
    width: 64px;
    height: 64px;
    margin: 0 auto 14px;
}

.auth-logo-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: conic-gradient(var(--primary), var(--gold), var(--primary-dark), var(--primary));
    animation: logoSpin 6s linear infinite;
    opacity: 0.7;
}

@keyframes logoSpin {
    to { transform: rotate(360deg); }
}

.auth-logo-ring::after {
    content: '';
    position: absolute;
    inset: 3px;
    border-radius: 50%;
    background: var(--bg-1);
}

.auth-logo-inner {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.auth-title {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, #fff, var(--primary-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}

.auth-tagline {
    color: var(--text-secondary);
    font-size: 0.82rem;
    margin-bottom: 14px;
}

.auth-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}

.auth-feature-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 12px;
    border-radius: 20px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-secondary);
    font-size: 0.72rem;
    font-weight: 500;
}

/* Auth card */
.auth-card {
    width: 100%;
    max-width: min(400px, 100%);
    background: linear-gradient(160deg, rgba(255,255,255,0.1), rgba(255,255,255,0.03));
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 20px;
    padding: 20px 18px 22px;
    box-shadow: 0 16px 48px rgba(0,0,0,0.35), inset 0 1px 0 rgba(255,255,255,0.1);
    animation: authFadeUp 0.6s ease 0.15s both;
}

@keyframes authFadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-card-title {
    text-align: center;
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.auth-google-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 11px 16px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 12px;
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(12px);
    color: #fff;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.06);
}

.auth-google-btn:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

.auth-google-btn:active {
    transform: scale(0.98);
}

.auth-divider {
    display: flex;
    align-items: center;
    margin: 12px 0;
    gap: 12px;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: rgba(255,255,255,0.1);
}

.auth-divider span {
    color: rgba(255,255,255,0.35);
    font-size: 0.75rem;
    white-space: nowrap;
}

/* Tabs */
.auth-tabs {
    display: flex;
    background: rgba(255,255,255,0.06);
    border-radius: 10px;
    padding: 3px;
    margin-bottom: 14px;
}

.auth-tab {
    flex: 1;
    padding: 8px 0;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
}

.auth-tab.active {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 10px rgba(124,58,237,0.35);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.auth-field {
    display: flex;
    flex-direction: column;
    gap: 3px;
    overflow: hidden;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    max-height: 70px;
    opacity: 1;
}

.auth-field.collapsed {
    max-height: 0;
    opacity: 0;
    margin: 0;
    padding: 0;
}

.auth-field label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding-left: 2px;
}

.auth-input {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 10px;
    background: rgba(255,255,255,0.06);
    color: #fff;
    font-size: 0.9rem;
    outline: none;
    transition: all 0.3s;
    box-sizing: border-box;
}

.auth-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(167,139,250,0.12);
    background: rgba(255,255,255,0.08);
}

.auth-input::placeholder {
    color: rgba(255,255,255,0.3);
}

.auth-submit {
    width: 100%;
    padding: 12px;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 2px;
    box-sizing: border-box;
}

.auth-error {
    color: #f87171;
    font-size: 0.8rem;
    min-height: 0;
    margin: 0;
    padding: 0 2px;
    transition: all 0.3s;
}

.auth-error:empty {
    display: none;
}

/* ============ HEADER USER ============ */
.header-user {
    display: flex;
    align-items: center;
    gap: 4px;
    position: relative;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    color: #fff;
    overflow: hidden;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.user-menu-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
}

.user-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: rgba(30, 25, 60, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 12px;
    padding: 16px;
    z-index: 999;
    flex-direction: column;
    gap: 4px;
}

.user-dropdown.show {
    display: flex;
}

.user-dropdown-name {
    color: #fff;
    font-weight: 600;
    font-size: 0.9rem;
}

.user-dropdown-email {
    color: var(--text-secondary);
    font-size: 0.78rem;
}

.user-dropdown-logout {
    width: 100%;
    padding: 10px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 8px;
    background: rgba(248, 113, 113, 0.15);
    color: #f87171;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s;
}

.user-dropdown-logout:hover {
    background: rgba(248, 113, 113, 0.25);
}

/* ============ ADMIN ============ */
.admin-section {
    margin-bottom: 16px;
}

.admin-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    padding-left: 2px;
}

.admin-search-row {
    display: flex;
    gap: 8px;
}

.admin-search-row .auth-input {
    flex: 1;
}

.admin-user-card {
    padding: 14px 16px;
    background: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.03));
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 14px;
}

.admin-user-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.admin-user-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: #fff;
}

.admin-user-email {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.admin-user-uid {
    font-size: 0.68rem;
    color: rgba(255,255,255,0.25);
    font-family: monospace;
    margin-top: 4px;
}

.admin-guides-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.admin-guide-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    background: linear-gradient(145deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    transition: all 0.25s;
}

.admin-guide-row.assigned {
    border-color: rgba(52, 211, 153, 0.3);
    background: rgba(52, 211, 153, 0.06);
}

.admin-guide-name {
    flex: 1;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text);
}

.admin-guide-toggle {
    padding: 7px 14px;
    border-radius: 8px;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
    border: none;
    min-width: 72px;
}

.admin-guide-toggle.add {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: #fff;
    box-shadow: 0 2px 8px rgba(124,58,237,0.3);
}

.admin-guide-toggle.add:hover {
    box-shadow: 0 4px 16px rgba(124,58,237,0.4);
}

.admin-guide-toggle.remove {
    background: rgba(248,113,113,0.12);
    color: #f87171;
    border: 1px solid rgba(248,113,113,0.25);
}

.admin-guide-toggle.remove:hover {
    background: rgba(248,113,113,0.2);
}

.admin-guide-toggle.btn-loading {
    min-width: 72px;
}

.action-card-icon.admin-icon {
    background: rgba(251, 191, 36, 0.15);
    color: var(--gold);
}

/* ============ GLOBAL ACTIVE STATES ============ */
.btn-primary:active,
.btn-secondary:active,
.nav-btn:active,
.guide-card:active,
.mc-option:active,
.eval-btn:active,
.mastery-block:active:not(.locked),
.mp-menu-card:active,
.mp-entry-btn:active {
    transform: scale(0.97);
    transition-duration: 0.1s;
}

/* ============ FOCUS VISIBLE ============ */
:focus-visible {
    outline: 2px solid var(--primary-light);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-light);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(167, 139, 250, 0.15);
}

/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============ SELECTION ============ */
::selection {
    background: rgba(167, 139, 250, 0.4);
    color: #fff;
}