/* ============================================================
   Masita Academy — OpenCode Design System
   Warm dark theme with monospace typography
   ============================================================ */

/* ── CSS Custom Properties ─────────────────────────────────── */
:root {
    /* Base colors - OpenCode warm palette */
    --bg-primary: #201d1d;
    --bg-surface: #302c2c;
    --bg-elevated: #3a3636;
    --bg-input: #302c2c;

    /* Text colors - warm off-white/gray */
    --text-primary: #fdfcfc;
    --text-secondary: #9a9898;
    --text-muted: #6e6e73;

    /* Borders - warm transparent */
    --border-color: rgba(15, 0, 0, 0.12);
    --border-subtle: #646262;

    /* Level colors (Gamified) - Apple HIG semantic */
    --level-1: #00d4aa; /* Teal - Newbie */
    --level-2: #3b82f6; /* Blue - Explorer */
    --level-3: #8b5cf6; /* Purple - Builder */
    --level-4: #f59e0b; /* Amber - Engineer */
    --level-5: #ef4444; /* Red - Architect */
    --level-6: #ffd700; /* Gold - Master */

    /* XP & Progress */
    --xp-color: #00d4aa;
    --progress-bg: #302c2c;
    --progress-fill: #00d4aa;

    /* Accents - muted */
    --accent-primary: #fdfcfc;
    --accent-success: #00d4aa;
    --accent-warning: #f59e0b;

    /* Spacing - 8px grid */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 80px;
    --space-5xl: 96px;

    /* Typography - monospace everywhere */
    --font-mono: 'Berkeley Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    --font-body: 'Berkeley Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Animations */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ── Base Layout ───────────────────────────────────────────── */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    width: 100%;
}

html {
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Base Typography ───────────────────────────────────────── */
body {
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-mono);
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
}

h1 {
    font-size: 38px;
}

h2 {
    font-size: 24px;
}

h3 {
    font-size: 20px;
}

h4 {
    font-size: 18px;
}

p {
    font-weight: 400;
    line-height: 1.5;
}

/* ── Hero Section ──────────────────────────────────────────── */
.hero {
    text-align: center;
    padding: var(--space-3xl) var(--space-md);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.hero h1 {
    font-family: var(--font-mono);
    font-size: 38px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.hero p {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

/* User Stats Bar */
.user-stats-bar {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.stat-item {
    text-align: center;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-surface);
    border-radius: 4px;
    border: 1px solid var(--border-subtle);
    border-left: 3px solid rgba(15, 0, 0, 0.3);
    min-width: 120px;
    width: 120px;
}

/* Warm color accents for each stat */
.stat-item:nth-child(1) {
    border-left-color: rgba(253, 252, 252, 0.4);
}

.stat-item:nth-child(2) {
    border-left-color: rgba(253, 252, 252, 0.6);
}

.stat-item:nth-child(3) {
    border-left-color: rgba(253, 252, 252, 0.8);
}

.stat-value {
    display: block;
    font-family: var(--font-mono);
    font-size: 28px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
}

.stat-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 400;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--space-xs);
}

/* ── Level Cards Grid ─────────────────────────────────────── */
.levels-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    padding: var(--space-xl) var(--space-md);
    max-width: 1200px;
    margin: 0 auto;
}

.level-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

/* Level-specific hover effects with their own colors */
.level-card.level-1.unlocked:hover {
    transform: translateY(-6px) scale(1.02);
    border-color: var(--level-1);
    background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(255, 255, 255, 0.08) 100%);
    box-shadow:
        0 12px 40px rgba(0, 212, 170, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
    filter: brightness(1.05);
}
.level-card.level-2.unlocked:hover {
    transform: translateY(-6px) scale(1.02);
    border-color: var(--level-2);
    background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(255, 255, 255, 0.08) 100%);
    box-shadow:
        0 12px 40px rgba(59, 130, 246, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
    filter: brightness(1.05);
}
.level-card.level-3.unlocked:hover {
    transform: translateY(-6px) scale(1.02);
    border-color: var(--level-3);
    background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(255, 255, 255, 0.08) 100%);
    box-shadow:
        0 12px 40px rgba(139, 92, 246, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
    filter: brightness(1.05);
}
.level-card.level-4.unlocked:hover {
    transform: translateY(-6px) scale(1.02);
    border-color: var(--level-4);
    background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(255, 255, 255, 0.08) 100%);
    box-shadow:
        0 12px 40px rgba(245, 158, 11, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
    filter: brightness(1.05);
}
.level-card.level-5.unlocked:hover {
    transform: translateY(-6px) scale(1.02);
    border-color: var(--level-5);
    background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(255, 255, 255, 0.08) 100%);
    box-shadow:
        0 12px 40px rgba(239, 68, 68, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
    filter: brightness(1.05);
}
.level-card.level-6.unlocked:hover {
    transform: translateY(-6px) scale(1.02);
    border-color: var(--level-6);
    background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(255, 255, 255, 0.08) 100%);
    box-shadow:
        0 12px 40px rgba(255, 215, 0, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
    filter: brightness(1.05);
}

.level-card.unlocked:active {
    transform: translateY(-2px);
}

.level-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(0.4);
}

/* Base unlocked level styling */
.level-card.unlocked {
    background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(255, 255, 255, 0.03) 100%);
    border: 2px solid var(--border-color);
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.08),
        0 0 0 1px rgba(255, 255, 255, 0.05) inset;
}

/* Level-specific border colors for unlocked cards */
.level-card.level-1.unlocked {
    border-color: var(--level-1);
}
.level-card.level-2.unlocked {
    border-color: var(--level-2);
}
.level-card.level-3.unlocked {
    border-color: var(--level-3);
}
.level-card.level-4.unlocked {
    border-color: var(--level-4);
}
.level-card.level-5.unlocked {
    border-color: var(--level-5);
}
.level-card.level-6.unlocked {
    border-color: var(--level-6);
}

/* Level-specific hover effects with their own colors */
.level-card.level-1.unlocked:hover {
    border-color: var(--level-1);
    box-shadow:
        0 12px 40px rgba(0, 212, 170, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
}
.level-card.level-2.unlocked:hover {
    border-color: var(--level-2);
    box-shadow:
        0 12px 40px rgba(59, 130, 246, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
}
.level-card.level-3.unlocked:hover {
    border-color: var(--level-3);
    box-shadow:
        0 12px 40px rgba(139, 92, 246, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
}
.level-card.level-4.unlocked:hover {
    border-color: var(--level-4);
    box-shadow:
        0 12px 40px rgba(245, 158, 11, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
}
.level-card.level-5.unlocked:hover {
    border-color: var(--level-5);
    box-shadow:
        0 12px 40px rgba(239, 68, 68, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
}
.level-card.level-6.unlocked:hover {
    border-color: var(--level-6);
    box-shadow:
        0 12px 40px rgba(255, 215, 0, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Common hover transform for all unlocked cards */
.level-card.unlocked:hover {
    transform: translateY(-6px) scale(1.02);
    background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(255, 255, 255, 0.08) 100%);
    filter: brightness(1.05);
}

/* OPEN badge for all unlocked levels - level specific colors */
.level-card.unlocked::after {
    content: 'OPEN';
    position: absolute;
    top: 12px;
    right: 12px;
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 4px 10px;
    color: white;
    border-radius: 20px;
    opacity: 0.9;
}

/* Level-specific OPEN badge colors */
.level-card.level-1.unlocked::after {
    background: var(--level-1);
}
.level-card.level-2.unlocked::after {
    background: var(--level-2);
}
.level-card.level-3.unlocked::after {
    background: var(--level-3);
}
.level-card.level-4.unlocked::after {
    background: var(--level-4);
}
.level-card.level-5.unlocked::after {
    background: var(--level-5);
}
.level-card.level-6.unlocked::after {
    background: var(--level-6);
}

/* Level indicator bars on left of cards */
.level-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--level-1);
}

.level-card.level-1::before {
    background: var(--level-1);
}
.level-card.level-2::before {
    background: var(--level-2);
}
.level-card.level-3::before {
    background: var(--level-3);
}
.level-card.level-4::before {
    background: var(--level-4);
}
.level-card.level-5::before {
    background: var(--level-5);
}
.level-card.level-6::before {
    background: var(--level-6);
}

.level-icon {
    font-size: 40px;
    flex-shrink: 0;
}

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

.level-name {
    font-family: var(--font-mono);
    font-size: 18px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.level-description {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.level-progress-bar {
    height: 8px;
    background: var(--progress-bg);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--space-xs);
}

.progress-fill {
    height: 100%;
    background-color: var(--accent-success);
    border-radius: 4px;
    transition: width var(--transition-slow);
    min-width: 2px;
    display: block;
    visibility: visible;
    opacity: 1;
}

.level-progress-text {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 400;
    color: var(--text-muted);
}

.level-enter {
    padding: 6px 16px;
    background: transparent;
    color: var(--text-muted);
    border-radius: 20px;
    border: 1px solid var(--border-subtle);
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    line-height: 1;
    transition: all var(--transition-fast);
    pointer-events: none;
}

/* Unlocked levels - brighter button by default */
.level-card.unlocked .level-enter {
    background: rgba(31, 111, 235, 0.1);
    color: var(--accent-blue);
    border-color: var(--accent-blue);
    font-weight: 600;
}

.level-card:hover:not(.locked) .level-enter {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
    box-shadow: 0 4px 16px rgba(31, 111, 235, 0.4);
    transform: scale(1.05);
}

.level-lock {
    font-size: 24px;
    opacity: 0.5;
}

/* ── Course Cards ──────────────────────────────────────────── */
.courses-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md);
    width: 100%;
}

.course-card {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.course-card:hover {
    border-color: var(--text-primary);
    background: var(--bg-elevated);
}

.course-card.completed {
    border-color: var(--accent-success);
    background: rgba(0, 212, 170, 0.05);
}

.course-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-primary);
    flex-shrink: 0;
}

.course-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.course-title {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.course-description {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-secondary);
}

.course-time {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 400;
    color: var(--text-muted);
    margin-left: var(--space-sm);
}

.course-status {
    display: flex;
    align-items: center;
}

.btn-start {
    padding: 4px 20px;
    background: var(--accent-blue);
    border: none;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    transition: all var(--transition-fast);
    white-space: nowrap;
    pointer-events: none; /* Let parent card handle click */
}

.status-badge {
    padding: 4px 20px;
    background: var(--accent-success);
    color: var(--bg-primary);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    white-space: nowrap;
    pointer-events: none; /* Let parent card handle click */
}

.status-badge.completed {
    background: var(--accent-success);
}

/* ── Level Header ─────────────────────────────────────────── */
.level-header {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-md);
    text-align: center;
}

.level-header h1 {
    font-family: var(--font-mono);
    font-size: 38px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.level-header p {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.level-progress-large {
    max-width: 400px;
    margin: 0 auto;
}

.level-progress-large .progress-bar {
    height: 8px;
    background: var(--progress-bg);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.level-progress-large span {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 400;
    color: var(--text-muted);
}

/* ── Course Page ───────────────────────────────────────────── */
.course-page {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md);
}

.course-header {
    padding: var(--space-xl);
    background: var(--bg-surface);
    border-radius: 4px;
    border-left: 4px solid;
    border: 1px solid var(--border-subtle);
    margin-bottom: var(--space-xl);
}

.course-meta {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    align-items: center;
}

/* Level Badge - Prominent, colored by level */
.level-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 20px;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 600;
    line-height: 1;
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.level-badge::before {
    content: '◆';
    font-size: 10px;
    opacity: 0.8;
}

/* Course Number Badge - Secondary, subtle */
.course-number-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    line-height: 1;
    color: var(--text-secondary);
}

.course-number-badge::before {
    content: '#';
    opacity: 0.6;
    font-weight: 400;
}

/* Time Badge - Tertiary, minimal */
.time-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: transparent;
    border: 1px dashed var(--border-color);
    border-radius: 20px;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 400;
    line-height: 1;
    color: var(--text-muted);
}

.time-badge::before {
    content: '⏱';
    font-size: 12px;
}

.course-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.btn-complete {
    padding: 4px 20px;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-complete.completed {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border-color: var(--border-subtle);
}

.xp-earned {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    color: var(--xp-color);
}

.course-body {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
}

.course-body h2 {
    font-family: var(--font-mono);
    font-size: 24px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-color);
}

.masita-context {
    margin-top: var(--space-xl);
    padding: var(--space-lg);
    background: var(--bg-surface);
    border-radius: 4px;
    border: 1px solid var(--border-subtle);
    border-left: 3px solid var(--text-primary);
}

.masita-context h4 {
    font-family: var(--font-mono);
    font-size: 18px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.masita-context p {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-secondary);
}

/* ── Course Navigation ────────────────────────────────────── */
.course-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--space-md);
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-color);
}

.nav-prev,
.nav-next {
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    background: var(--bg-surface);
    border-radius: 4px;
    border: 1px solid var(--border-subtle);
    text-decoration: none;
    transition: all var(--transition-fast);
    flex: 1;
}

.nav-prev:hover,
.nav-next:hover {
    border-color: var(--text-primary);
    background: var(--bg-elevated);
}

.nav-next {
    text-align: right;
    align-items: flex-end;
}

.nav-label {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 400;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

.nav-title {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    color: var(--text-primary);
}

/* ── Sticky Navigation Bar ────────────────────────────────── */
.sticky-nav-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* ── Breadcrumb ───────────────────────────────────────────── */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-muted);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.breadcrumb .current-page {
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 300px;
}

.breadcrumb a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.breadcrumb a:hover {
    background: var(--bg-surface);
    text-decoration: underline;
}

.breadcrumb span {
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-primary);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* ── Locked Message ────────────────────────────────────────── */
.locked-message {
    max-width: 600px;
    margin: var(--space-2xl) auto;
    text-align: center;
    padding: var(--space-2xl);
    background: var(--bg-surface);
    border-radius: 4px;
    border: 1px solid var(--border-subtle);
}

.locked-message h2 {
    font-family: var(--font-mono);
    font-size: 24px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.locked-message p {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.btn-primary {
    display: inline-block;
    padding: 4px 20px;
    background: var(--bg-primary);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 4px;
    border: 1px solid var(--border-subtle);
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    transition: all var(--transition-fast);
}

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

/* ── Form Inputs ──────────────────────────────────────────── */
input,
textarea,
select {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    padding: 8px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    color: var(--text-primary);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--text-primary);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 28px;
    }

    h1 {
        font-size: 28px;
    }

    .levels-grid {
        grid-template-columns: 1fr;
    }

    .level-card {
        flex-direction: column;
        text-align: center;
    }

    .level-card::before {
        width: 100%;
        height: 4px;
        top: 0;
        bottom: auto;
    }

    .user-stats-bar {
        flex-wrap: wrap;
        gap: var(--space-md);
    }

    .stat-item {
        flex: 1;
        min-width: 120px;
    }

    .course-card {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .course-status {
        width: 100%;
        justify-content: flex-end;
    }

    .course-nav {
        flex-direction: column;
    }

    .nav-next {
        text-align: left;
        align-items: flex-start;
    }

    .course-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .course-meta {
        justify-content: center;
    }

    /* Mobile Navigation - Hamburger Menu */
    .nav-toggle {
        display: flex;
    }

    .nav-inner {
        flex-wrap: wrap;
        padding: var(--space-sm) var(--space-md);
        gap: var(--space-sm);
    }

    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: var(--space-xs);
        padding: var(--space-sm) 0;
        border-top: 1px solid var(--border-color);
        margin-top: var(--space-sm);
    }

    .nav-links.active {
        display: flex;
    }

    /* Row 1: Main navigation buttons */
    .nav-links .nav-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--space-xs);
        width: 100%;
    }

    .nav-link {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 12px var(--space-sm);
        font-size: 14px;
        min-height: 44px;
        line-height: 1.2;
        border-radius: 6px;
        text-align: center;
        background: var(--bg-surface);
        border: 1px solid var(--border-color);
        white-space: nowrap;
    }

    .nav-link:hover,
    .nav-link.active {
        background: var(--bg-elevated);
        border-color: var(--text-secondary);
        text-decoration: none;
    }

    /* Row 2: Search + Reset - proportional like row 1 */
    .nav-links .nav-row:nth-child(2) {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--space-xs);
        width: 100%;
    }

    .nav-links .nav-row:nth-child(2) form {
        display: flex;
        width: 100%;
    }

    .nav-search {
        width: 100% !important;
        max-width: 100%;
        padding: 12px 16px;
        font-size: 14px;
        min-height: 44px;
        background: var(--bg-surface);
        border: 1px solid var(--border-color);
        border-radius: 6px;
        transition: border-color 150ms ease !important;
    }

    .nav-search:focus {
        border-color: var(--text-secondary);
        width: 100% !important;
        max-width: 100%;
        outline: none;
    }

    .nav-btn-danger {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        padding: 12px var(--space-sm);
        font-size: 14px;
        min-height: 44px;
        text-align: center;
        background: transparent;
        border: 1px solid rgba(255, 59, 48, 0.3);
        border-radius: 6px;
        color: #ff3b30;
        font-family: var(--font-mono);
        font-weight: 500;
        cursor: pointer;
        line-height: 1.2;
        white-space: nowrap;
    }

    .nav-btn-danger:hover {
        background: rgba(255, 59, 48, 0.1);
        border-color: #ff3b30;
    }

    /* Mobile: show short text, hide long text */
    .nav-btn-text-desktop {
        display: none;
    }

    .nav-btn-text-mobile {
        display: inline;
    }
}

/* ============================================================
   Tablet Breakpoint (769px - 1024px)
   iPad, iPad Mini, small tablets
   ============================================================ */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 95%;
        padding: 0 var(--space-lg);
    }

    .levels-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }

    .level-card {
        padding: var(--space-md);
    }

    .level-icon {
        font-size: 32px;
    }

    .courses-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .course-card {
        padding: var(--space-md);
    }

    .course-number {
        width: 36px;
        height: 36px;
        font-size: 13px;
    }

    .achievements-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }

    .achievement-card {
        padding: var(--space-md);
    }

    h1 {
        font-size: 32px;
    }

    h2 {
        font-size: 24px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .sticky-nav-bar {
        top: 0;
        left: 0;
        right: 0;
    }

    .breadcrumb {
        padding: 0 var(--space-md);
    }
}

/* ── Course Completion Section ─────────────────────────────── */
.course-completion-section {
    max-width: 600px;
    margin: var(--space-2xl) auto;
    padding: var(--space-xl) var(--space-2xl);
    background: var(--bg-warm);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all 0.2s ease;
}

.course-completion-section.completed {
    border-color: var(--accent-success);
    background: linear-gradient(135deg, rgba(35, 134, 54, 0.05), rgba(46, 160, 67, 0.05));
}

.completion-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    font-family: var(--font-mono);
    font-size: 15px;
    font-weight: 600;
    padding: 14px 32px;
    min-height: 52px;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    background: linear-gradient(135deg, #238636 0%, #2ea043 100%);
    color: white;
    box-shadow:
        0 4px 14px rgba(35, 134, 54, 0.4),
        0 1px 2px rgba(0, 0, 0, 0.1);
    letter-spacing: 0.3px;
}

.completion-toggle::before {
    content: '✓';
    font-size: 16px;
    font-weight: 700;
}

.completion-toggle:hover {
    background: linear-gradient(135deg, #2ea043 0%, #3fb950 100%);
    transform: translateY(-2px) scale(1.02);
    box-shadow:
        0 8px 25px rgba(35, 134, 54, 0.5),
        0 2px 4px rgba(0, 0, 0, 0.1);
}

.completion-toggle:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 8px rgba(35, 134, 54, 0.3);
}

.completion-toggle.completed {
    background: var(--bg-secondary);
    color: var(--text-muted);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
}

.completion-toggle.completed::before {
    content: '←';
    font-size: 14px;
}

.completion-toggle.completed:hover {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-color: var(--text-muted);
    transform: translateY(-1px);
}

/* ── Course Navigation (Prev/Next) ─────────────────────────── */
.course-navigation {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.nav-prev,
.nav-next {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding: var(--space-lg);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.2s ease;
    min-width: 200px;
}

.nav-prev:hover,
.nav-next:hover {
    border-color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.nav-next {
    text-align: right;
    align-items: flex-end;
}

.nav-label {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.nav-course {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.nav-complete {
    background: linear-gradient(135deg, rgba(35, 134, 54, 0.1), rgba(46, 160, 67, 0.1));
    border-color: var(--accent-success);
}

.nav-complete:hover {
    background: linear-gradient(135deg, rgba(35, 134, 54, 0.15), rgba(46, 160, 67, 0.15));
    border-color: var(--accent-success);
}

.nav-complete .nav-label {
    color: var(--accent-success);
}

.nav-placeholder {
    flex: 1;
    min-width: 200px;
}

@media (max-width: 640px) {
    .course-navigation {
        flex-direction: column;
    }

    .nav-prev,
    .nav-next {
        text-align: left;
        align-items: flex-start;
    }
}

/* ── Navigation ─────────────────────────────────────────────── */
.nav {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.nav-brand {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    white-space: nowrap;
}

.nav-brand:hover {
    text-decoration: underline;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

/* Desktop: nav-row is transparent */
.nav-row {
    display: contents;
}

/* ── Mobile Navigation Toggle (Hamburger) ──────────────────── */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    cursor: pointer;
    gap: 5px;
}

.nav-toggle:hover {
    border-color: var(--text-secondary);
}

.nav-toggle-bar {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 1px;
    transition: all var(--transition-fast);
}

.nav-toggle[aria-expanded='true'] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded='true'] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded='true'] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    text-decoration: underline;
}

/* ── Navigation Search Input ─────────────────────────────────── */
.nav-search {
    padding: 6px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 9999px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 400;
    line-height: 1.5;
    width: 180px;
    outline: none;
    transition: all var(--transition-fast);
}

.nav-search:focus {
    border-color: var(--text-primary);
    width: 220px;
}

.nav-search::placeholder {
    color: var(--text-muted);
}

/* ── Navigation Danger Button ──────────────────────────────── */
.nav-btn-danger {
    padding: 6px 16px;
    background: transparent;
    color: #ff3b30;
    border: 1px solid #ff3b30;
    border-radius: 9999px;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    line-height: 1.5;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    height: fit-content;
}

.nav-btn-danger:hover {
    background: #ff3b30;
    color: var(--text-primary);
}

/* Button text visibility by viewport */
.nav-btn-text-desktop {
    display: inline;
}

.nav-btn-text-mobile {
    display: none;
}

/* ── Modal ─────────────────────────────────────────────────── */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: var(--space-xl);
    max-width: 400px;
    width: 90%;
    text-align: center;
    z-index: 1001;
}

.modal-title {
    font-family: var(--font-mono);
    font-size: 20px;
    font-weight: 700;
    color: #ff3b30;
    margin-bottom: var(--space-md);
}

.modal-text {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-xl);
}

.modal-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
}

.btn-modal-secondary {
    padding: 8px 20px;
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-modal-danger {
    padding: 8px 20px;
    background: #ff3b30;
    color: white;
    border: 1px solid #ff3b30;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-modal-danger:hover {
    background: #d70015;
    border-color: #d70015;
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
    margin-top: auto;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--space-lg);
    text-align: center;
}

.footer p {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-muted);
}

/* ============================================================
   COURSE CONTENT STYLING
   Tables, Code Blocks, Mermaid Diagrams
   ============================================================ */

/* ── Course Body Content ──────────────────────────────────── */
.course-body {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.7;
    color: var(--text-primary);
}

.course-body p {
    margin-bottom: var(--space-md);
}

.course-body h2 {
    font-family: var(--font-mono);
    font-size: 28px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-color);
}

.course-body h3 {
    font-family: var(--font-mono);
    font-size: 22px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
}

.course-body h4 {
    font-family: var(--font-mono);
    font-size: 18px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.course-body ul,
.course-body ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-lg);
}

.course-body li {
    margin-bottom: var(--space-xs);
}

.course-body strong {
    font-weight: 700;
    color: var(--text-primary);
}

.course-body em {
    font-style: italic;
}

/* ── Tables ───────────────────────────────────────────────── */
.course-body table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    overflow: hidden;
}

.course-body th,
.course-body td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
}

.course-body th {
    background: var(--bg-elevated);
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-subtle);
}

.course-body td {
    color: var(--text-secondary);
}

.course-body tr:last-child td {
    border-bottom: none;
}

.course-body tr:hover td {
    background: var(--bg-elevated);
}

/* ── Code Blocks ───────────────────────────────────────────── */
.course-body pre {
    background: #1a1717;
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: var(--space-md);
    margin: var(--space-md) 0;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
}

.course-body pre code {
    background: transparent;
    padding: 0;
    border: none;
    font-size: inherit;
    color: var(--text-primary);
}

.course-body code {
    background: var(--bg-elevated);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--accent-success);
}

/* Code block wrapper with copy button */
.code-block-wrapper {
    position: relative;
    margin: var(--space-md) 0;
}

.code-block-wrapper pre {
    margin: 0;
}

.code-copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* ── Mermaid Diagrams ─────────────────────────────────────── */
.mermaid-wrapper {
    margin: var(--space-lg) 0;
    padding: var(--space-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    overflow-x: auto;
    text-align: center;
}

.mermaid {
    display: inline-block;
    min-width: 100%;
}

/* Ensure mermaid SVG is properly sized */
.mermaid svg {
    max-width: 100%;
    height: auto;
    min-height: 200px;
}

/* ── Blockquotes ───────────────────────────────────────────── */
.course-body blockquote {
    margin: var(--space-md) 0;
    padding: var(--space-md) var(--space-lg);
    border-left: 3px solid var(--text-primary);
    background: var(--bg-surface);
    color: var(--text-secondary);
    font-style: italic;
}

/* ── Links in Course Body ─────────────────────────────────── */
.course-body a {
    color: var(--text-primary);
    text-decoration: underline;
    transition: color var(--transition-fast);
}

.course-body a:hover {
    color: var(--accent-success);
}

/* ── Horizontal Rules ──────────────────────────────────────── */
.course-body hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: var(--space-xl) 0;
}

/* ── Images ────────────────────────────────────────────────── */
.course-body img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: var(--space-md) 0;
}

/* ── Definition Lists ───────────────────────────────────── */
.course-body dl {
    margin: var(--space-md) 0;
}

.course-body dt {
    font-weight: 700;
    color: var(--text-primary);
    margin-top: var(--space-sm);
}

.course-body dd {
    margin-left: var(--space-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

/* ── Course Completion Section (Bottom) ───────────────────── */
.course-completion-section {
    margin-top: var(--space-2xl);
    text-align: center;
    padding: var(--space-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
}

.course-completion-section h3 {
    font-family: var(--font-mono);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    margin-top: 0;
    border: none;
    padding: 0;
}

.completion-divider {
    height: 1px;
    background: var(--border-color);
    margin-bottom: var(--space-xl);
}

.btn-complete-large {
    padding: 12px 32px;
    background: var(--accent-success);
    color: var(--bg-primary);
    border: none;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
}

.btn-complete-large:hover {
    background: #00f5c4;
    transform: scale(1.02);
}

.btn-complete-large.completed {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    cursor: default;
}

.btn-complete-large.completed:hover {
    transform: none;
}

.completion-xp {
    display: block;
    margin-top: var(--space-md);
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--accent-success);
    font-weight: 600;
}

/* ============================================================
   SEARCH PAGE — Matching existing design system
   ============================================================ */

.search-form {
    display: flex;
    gap: var(--space-sm);
    max-width: 560px;
    margin: 0 auto var(--space-lg);
    width: 100%;
}

.search-input-main {
    flex: 1;
    padding: 12px 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 15px;
    font-weight: 400;
    outline: none;
    transition: border-color var(--transition-fast);
}

.search-input-main:focus {
    border-color: var(--text-primary);
}

.search-input-main::placeholder {
    color: var(--text-muted);
}

.search-submit {
    padding: 12px 24px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.search-submit:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

.search-results-section {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md);
    width: 100%;
}

.search-results-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

.search-results-count {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-secondary);
}

.search-results-count strong {
    color: var(--text-primary);
}

.search-results-badges {
    display: flex;
    gap: var(--space-sm);
}

.search-info-badge {
    padding: 4px 12px;
    background: rgba(0, 212, 170, 0.1);
    color: var(--accent-success);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
}

.search-info-badge.muted {
    background: var(--bg-surface);
    color: var(--text-muted);
}

.search-results-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.search-result-link {
    text-decoration: none;
    color: inherit;
}

.search-result-link:hover .course-title {
    text-decoration: underline;
}

.search-result-locked {
    cursor: not-allowed;
    opacity: 0.5;
    filter: grayscale(0.3);
}

.search-result-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-xs);
}

.search-level-pill {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border: 1px solid;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.search-lock-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    background: var(--bg-surface);
    border: 1px solid;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
}

.search-lock-icon {
    font-size: 14px;
}

.search-empty {
    text-align: center;
    padding: var(--space-3xl) var(--space-md);
}

.search-empty-icon {
    font-size: 48px;
    margin-bottom: var(--space-md);
}

.search-empty h3 {
    font-family: var(--font-mono);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.search-empty p {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.search-quick-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.search-quick-links > span {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-muted);
}

.search-quick-links a {
    padding: 4px 14px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.search-quick-links a:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
    background: var(--bg-elevated);
}

@media (max-width: 640px) {
    .search-form {
        flex-direction: column;
    }

    .search-results-info {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .search-result-meta {
        flex-wrap: wrap;
    }
}

/* ============================================================
   404 PAGE — Not Found
   ============================================================ */

.not-found-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 70vh;
    padding: var(--space-3xl) var(--space-md);
}

.not-found-code {
    font-family: var(--font-mono);
    font-size: 120px;
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(135deg, var(--level-1), var(--level-2), var(--level-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-lg);
    letter-spacing: -4px;
}

.not-found-message {
    font-family: var(--font-mono);
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.not-found-sub {
    font-family: var(--font-mono);
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: var(--space-xl);
    max-width: 400px;
}

.not-found-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

.not-found-btn-primary {
    padding: 12px 28px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.not-found-btn-primary:hover {
    opacity: 0.85;
    transform: translateY(-2px);
}

.not-found-btn-secondary {
    padding: 12px 28px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.not-found-btn-secondary:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
    background: var(--bg-elevated);
    transform: translateY(-2px);
}

/* ============================================================
   ACHIEVEMENTS PAGE
   ============================================================ */

.achievements-progress {
    max-width: 400px;
    margin: 0 auto var(--space-lg);
}

.achievements-progress-bar {
    height: 8px;
    background: var(--progress-bg);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--space-xs);
}

.achievements-progress-text {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-muted);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md);
}

.achievement-card {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    transition: all var(--transition-normal);
    position: relative;
}

.achievement-card.unlocked {
    border-color: var(--accent-success);
    background: rgba(0, 212, 170, 0.04);
}

.achievement-card.locked {
    opacity: 0.45;
    filter: grayscale(0.3);
}

.achievement-icon {
    font-size: 36px;
    flex-shrink: 0;
    width: 48px;
    text-align: center;
}

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

.achievement-name {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.achievement-desc {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 4px;
}

.achievement-date {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
}

.achievement-card.unlocked .achievement-date {
    color: var(--accent-success);
}

.achievement-status {
    flex-shrink: 0;
}

.achievement-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 4px;
    font-size: 16px;
}

.achievement-badge.unlocked {
    background: rgba(0, 212, 170, 0.15);
}

.achievement-badge.locked {
    background: var(--bg-elevated);
}

.achievements-complete-message {
    text-align: center;
    padding: var(--space-xl) var(--space-md);
    max-width: 500px;
    margin: 0 auto var(--space-2xl);
}

.achievements-complete-message span {
    font-size: 40px;
    display: block;
    margin-bottom: var(--space-sm);
}

.achievements-complete-message h3 {
    font-family: var(--font-mono);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .achievements-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   Page Transition Loading States
   ============================================================ */

/* Loading state for main container */
.page-loading {
    opacity: 0.6;
    transition: opacity 150ms ease;
}

/* HTMX request in progress - dim the main content */
.htmx-request main.container {
    opacity: 0.6;
    transition: opacity 150ms ease;
}

/* Top loading bar animation during navigation */
.htmx-request::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--level-2), transparent);
    animation: loading-bar 1s ease-in-out infinite;
    z-index: 9999;
}

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

/* Ensure clickable elements with HTMX have pointer cursor */
[hx-get],
[hx-post],
[hx-put],
[hx-delete],
[hx-patch] {
    cursor: pointer;
}

/* Smooth scroll behavior for HTMX swaps */
html {
    scroll-behavior: smooth;
}

/* ============================================================
   Mermaid Diagram Loading States & Caching
   ============================================================ */

.mermaid-wrapper {
    position: relative;
    min-height: 200px;
    margin: var(--space-lg) 0;
}

.mermaid-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    padding: var(--space-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    gap: var(--space-md);
}

.mermaid-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--level-2);
    border-radius: 50%;
    animation: mermaid-spin 1s linear infinite;
}

@keyframes mermaid-spin {
    to {
        transform: rotate(360deg);
    }
}

.mermaid-loading-text {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================================
   Table Wrapper - Independent horizontal scroll
   ============================================================ */

.table-wrapper {
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    margin: var(--space-lg) 0;
    background: var(--bg-elevated);
    border-radius: 4px;
    padding: var(--space-md);
    -webkit-overflow-scrolling: touch;
}

.table-wrapper table {
    width: auto;
    min-width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 14px;
}

.table-wrapper th,
.table-wrapper td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.table-wrapper th {
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-surface);
}

.table-wrapper td {
    color: var(--text-secondary);
}

.table-wrapper tr:hover td {
    background: var(--bg-surface);
}

/* Custom scrollbar for table wrapper */
.table-wrapper::-webkit-scrollbar {
    height: 6px;
}

.table-wrapper::-webkit-scrollbar-track {
    background: var(--bg-surface);
    border-radius: 3px;
}

.table-wrapper::-webkit-scrollbar-thumb {
    background: var(--border-subtle);
    border-radius: 3px;
}

.table-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Mermaid diagram container */
.mermaid-diagram {
    margin: var(--space-lg) 0;
    min-height: 150px;
    width: 100%;
    overflow-x: auto; /* Horizontal scroll if too wide */
    overflow-y: hidden;
    background: var(--bg-elevated);
    border-radius: 4px;
    padding: var(--space-md);
}

/* Mermaid SVG - auto-fitted by mermaid.js useMaxWidth */
.mermaid-diagram svg {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* Custom scrollbar for wide diagrams */
.mermaid-diagram::-webkit-scrollbar {
    height: 8px;
}

.mermaid-diagram::-webkit-scrollbar-track {
    background: var(--bg-surface);
    border-radius: 4px;
}

.mermaid-diagram::-webkit-scrollbar-thumb {
    background: var(--border-subtle);
    border-radius: 4px;
}

.mermaid-diagram::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================================================
   Mermaid Diagram Font Size Control
   ============================================================
   
   The CSS below forces a minimum readable font size on ALL
   mermaid diagrams, regardless of mermaid's internal scaling.
   
   To change text size across all diagrams, edit the value below.
   
   Recommended sizes:
   - 14px = compact (default)
   - 16px = readable (recommended)
   - 18px = large
   - 20px = extra large
   ============================================================ */

/* Force readable font sizes - overrides mermaid's calculated sizes */
.mermaid-diagram svg .nodeLabel,
.mermaid-diagram svg .node text,
.mermaid-diagram svg .node .label,
.mermaid-diagram svg .label,
.mermaid-diagram svg text {
    font-size: 16px !important;
}

.mermaid-diagram svg .edgeLabel,
.mermaid-diagram svg .edgeLabel text {
    font-size: 14px !important;
}

/* Auto-shrink on mobile */
@media (max-width: 768px) {
    .mermaid-diagram svg .nodeLabel,
    .mermaid-diagram svg .node text,
    .mermaid-diagram svg .node .label,
    .mermaid-diagram svg .label,
    .mermaid-diagram svg text {
        font-size: 14px !important;
    }
}

/* Allow horizontal scroll for wide diagrams */
.mermaid-diagram::-webkit-scrollbar {
    height: 6px;
}

.mermaid-diagram::-webkit-scrollbar-track {
    background: var(--bg-elevated);
    border-radius: 3px;
}

.mermaid-diagram::-webkit-scrollbar-thumb {
    background: var(--border-subtle);
    border-radius: 3px;
}

.mermaid-diagram::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}