/* ── Minimal Design + Dark Mode ── */

:root {
    /* Light mode colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f3f4f6;
    --text-primary: #0a0a0a;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --border-hover: #0a0a0a;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
}

[data-theme="dark"] {
    /* Dark mode colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --border-color: #2a2a2a;
    --border-hover: #ffffff;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    overflow-y: scroll;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ── HEADER ── */
.site-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: var(--bg-primary);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo img {
    width: 40px;
    height: 40px;
}

.logo h1 {
    font-size: 1.4em;
    font-weight: 600;
    letter-spacing: -0.5px;
}

/* Dark Mode Toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.theme-toggle:hover {
    border-color: var(--border-hover);
}

.theme-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1em;
    opacity: 0.5;
    transition: opacity 0.2s;
}

.theme-icon.active {
    opacity: 1;
}

/* ── MAIN CONTENT ── */
.main-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 60px 24px;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 80px;
}

.hero h1 {
    font-size: 3.5em;
    font-weight: 600;
    letter-spacing: -2px;
    margin-bottom: 16px;
}

.hero .subtitle {
    font-size: 1.25em;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3em;
    font-weight: 600;
    display: block;
    letter-spacing: -1px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}

/* Module Cards */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin: 60px 0;
}

.module-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px 32px;
    transition: all 0.2s ease;
}

.module-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modules-grid.single-module .card-icon {
    width: 40px;
    height: 40px;
}

.modules-grid.single-module {
    grid-template-columns: minmax(280px, 380px);
    justify-content: start;
}

.card-icon img {
    width: 100%;
    height: 100%;
}

.module-card h3 {
    font-size: 1.5em;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.module-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

/* Skeleton loader cards */
@keyframes skeleton-shine {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
.skeleton-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px 32px;
    pointer-events: none;
}
.sk {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: skeleton-shine 1.4s infinite linear;
    border-radius: 6px;
}
.sk-icon  { width: 80px; height: 80px; border-radius: 50%; margin: 0 auto 24px; }
.sk-title { height: 22px; width: 58%; margin: 0 auto 14px; }
.sk-line  { height: 13px; margin-bottom: 9px; }
.sk-w80   { width: 80%; }
.sk-w65   { width: 65%; }
.sk-tags  { display: flex; gap: 8px; margin: 20px 0 28px; }
.sk-tag   { height: 22px; width: 64px; border-radius: 20px; }
.sk-btn   { height: 44px; border-radius: 8px; }

.tag-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}

.tag {
    padding: 4px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.8em;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    font-weight: 500;
}

.module-btn {
    display: block;
    width: 100%;
    padding: 12px 24px;
    background: var(--text-primary);
    color: var(--bg-primary);
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.9em;
    font-weight: 500;
    text-align: center;
    transition: all 0.2s;
    border: 1px solid var(--text-primary);
}

.module-btn:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* Section Headers */
.section-header {
    margin: 80px 0 40px;
    text-align: center;
}

.section-header h2 {
    font-size: 2em;
    font-weight: 600;
    letter-spacing: -1px;
    margin-bottom: 12px;
}

.section-header p {
    color: var(--text-secondary);
}

/* Footer */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 40px 24px;
    margin-top: 80px;
}

.footer-content {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    text-align: center;
}

.footer-content p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9em;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-logo span {
    color: var(--text-secondary);
    font-size: 0.85em;
}

.footer-logo img {
    height: 28px;
    opacity: 0.7;
}

[data-theme="dark"] .footer-logo img {
    filter: brightness(0) invert(1);
}

/* Back to Menu Button */
.back-nav {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 10px 18px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9em;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.back-btn:hover {
    border-color: var(--border-hover);
    transform: translateX(-3px);
}


/* Global Progress Section */
.global-progress-section {
    margin: 60px 0;
    padding: 40px 0;
    background: var(--bg-secondary);
    border-radius: 16px;
}

.global-progress-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

.global-progress-container h2 {
    text-align: center;
    margin-bottom: 32px;
    font-size: 1.8em;
    font-weight: 600;
}

.progress-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.progress-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.2s;
}

.progress-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.progress-card.total {
    border: 2px solid var(--text-primary);
}

.progress-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.progress-icon {
    font-size: 2em;
}

.progress-card h3 {
    font-size: 1.1em;
    font-weight: 600;
}

.mini-progress-bar {
    width: 100%;
    height: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 12px;
}

.mini-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #f59e0b 0%, #10b981 100%);
    transition: width 0.5s ease;
}

.progress-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.85em;
    color: var(--text-secondary);
}

.total-stats {
    display: flex;
    justify-content: space-around;
    margin-top: 8px;
}

.total-stat {
    text-align: center;
}

.total-number {
    display: block;
    font-size: 2.5em;
    font-weight: 600;
    line-height: 1;
    margin-bottom: 8px;
}

.total-label {
    font-size: 0.85em;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.reset-stats-btn {
    display: block;
    margin: 0 auto;
    padding: 10px 20px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    color: var(--text-primary);
    transition: all 0.2s;
}

.reset-stats-btn:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}



/* Leaderboard Section */
.leaderboard-section {
    margin: 60px 0;
    padding: 40px 0;
}

.leaderboard-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}

.leaderboard-container h2 {
    text-align: center;
    margin-bottom: 8px;
    font-size: 2em;
}

.leaderboard-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.leaderboard-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    justify-content: center;
}

.tab-btn {
    padding: 10px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    color: var(--text-primary);
    transition: all 0.2s;
}

.tab-btn:hover {
    border-color: var(--border-hover);
}

.tab-btn.active {
    color: #ffffff !important;
    background: var(--text-primary) !important;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

.leaderboard-table {
    min-height: 300px;
}

.leaderboard-entry {
    display: grid;
    grid-template-columns: 60px 1fr 100px 80px;
    gap: 16px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 8px;
    align-items: center;
    transition: all 0.2s;
}

.leaderboard-entry:hover {
    transform: translateX(4px);
    border-color: var(--border-hover);
}

.leaderboard-entry.rank-1 {
    border-left: 4px solid #fbbf24;
    background: linear-gradient(90deg, rgba(251, 191, 36, 0.1) 0%, var(--bg-secondary) 100%);
}

.leaderboard-entry.rank-2 {
    border-left: 4px solid #94a3b8;
}

.leaderboard-entry.rank-3 {
    border-left: 4px solid #d97706;
}

.rank-badge {
    font-size: 1.5em;
    font-weight: 600;
    text-align: center;
}

.rank-1 .rank-badge { color: #fbbf24; }
.rank-2 .rank-badge { color: #94a3b8; }
.rank-3 .rank-badge { color: #d97706; }

.player-info h4 {
    font-size: 1em;
    margin-bottom: 4px;
}

.player-info .date {
    font-size: 0.8em;
    color: var(--text-secondary);
}

.score-badge {
    text-align: center;
}

.score-value {
    font-size: 1.8em;
    font-weight: 600;
    color: var(--text-primary);
}

.score-label {
    font-size: 0.75em;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.attempts {
    text-align: center;
    font-size: 0.85em;
    color: var(--text-secondary);
}

.leaderboard-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    justify-content: center;
}

.add-score-btn,
.clear-leaderboard-btn {
    padding: 12px 24px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s;
}

.add-score-btn {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

.add-score-btn:hover {
    opacity: 0.9;
}

.clear-leaderboard-btn {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.clear-leaderboard-btn:hover {
    border-color: #ef4444;
    color: #ef4444;
}

.empty-leaderboard {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-leaderboard-icon {
    font-size: 4em;
    margin-bottom: 16px;
    opacity: 0.5;
}

/* Modal for adding score */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 10000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.show {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 32px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.modal-content h3 {
    margin-bottom: 20px;
}

.modal-content input,
.modal-content select {
    width: 100%;
    padding: 12px;
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1em;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.modal-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.modal-actions button {
    flex: 1;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    border: 1px solid var(--border-color);
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
}


/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5em; }
    .stats { flex-direction: column; gap: 32px; }
    .modules-grid { grid-template-columns: 1fr; }
    .back-nav { top: 12px; left: 12px; }
}

/* Section Content (Tabs) */
.section-content {
    display: none;
}

.section-content.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Larger centered tabs */
.section-tabs {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 32px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0;
}

.section-tab {
    padding: 16px 32px;
    background: none;
    border: none;
    border-bottom: 4px solid transparent;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 1.1em;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    bottom: -2px;
}

.section-tab:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
    border-radius: 8px 8px 0 0;
}

.section-tab.active {
    color: var(--text-primary);
    border-bottom-color: var(--text-primary);
    font-weight: 700;
}

/* Dark mode tab colors */
[data-theme="dark"] .tab-btn.active {
    color: #000000 !important;
    background: #ffffff !important;
}