/* CoditoErgoSum — Main Stylesheet */

:root {
    --bg: #0b0f1a;
    --bg-card: #131929;
    --bg-elevated: #1a2236;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --accent: #10b981;
    --accent-2: #f59e0b;
    --danger: #ef4444;
    --success: #22c55e;
    --border: #1e293b;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --font: 'Nunito', system-ui, sans-serif;
    --mono: 'JetBrains Mono', monospace;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.bg-pattern {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(99,102,241,0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(16,185,129,0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(139,92,246,0.04) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

main { flex: 1; position: relative; z-index: 1; }

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.container-narrow { max-width: 800px; }

/* ===== NAVBAR ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(11,15,26,0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 0.75rem 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text);
    flex-shrink: 0;
}

.logo-img { width: 44px; height: 44px; }

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-text strong { font-size: 1.1rem; }
.logo-text small { font-size: 0.7rem; color: var(--text-muted); }

.nav-links {
    display: flex;
    gap: 1.25rem;
    flex: 1;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

.nav-auth {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-profile {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    font-size: 0.9rem;
}

.avatar { font-size: 1.5rem; }

.xp-badge {
    background: var(--primary);
    color: white;
    padding: 0.15rem 0.5rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius);
    font-family: var(--font);
    font-weight: 700;
    font-size: 0.95rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: white;
    box-shadow: 0 4px 15px rgba(99,102,241,0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99,102,241,0.4);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    color: var(--text);
    border-color: var(--text-muted);
}

.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.85rem; }
.btn-lg { padding: 0.85rem 1.75rem; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* ===== HERO ===== */
.hero {
    padding: 4rem 0 5rem;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    background: rgba(16,185,129,0.15);
    color: var(--accent);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--primary), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.hero-stats {
    display: flex;
    gap: 2.5rem;
}

.stat strong {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
}

.stat span { color: var(--text-muted); font-size: 0.85rem; }

/* Code window */
.code-window {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.code-window-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
}

.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red { background: #ef4444; }
.dot.yellow { background: #fbbf24; }
.dot.green { background: #22c55e; }
.code-title { margin-left: auto; font-family: var(--mono); font-size: 0.8rem; color: var(--text-muted); }

.code-content {
    padding: 1.25rem;
    font-family: var(--mono);
    font-size: 0.9rem;
    line-height: 1.7;
    overflow-x: auto;
}

.code-content .kw { color: #c084fc; }
.code-content .fn { color: #60a5fa; }
.code-content .str { color: #34d399; }

.floating { animation: float 4s ease-in-out infinite; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero-characters {
    position: relative;
    height: 60px;
    margin-top: 1rem;
}

.char {
    position: absolute;
    font-size: 2rem;
    animation: bounce 2s ease-in-out infinite;
}

.char-1 { left: 10%; animation-delay: 0s; }
.char-2 { left: 30%; animation-delay: 0.3s; }
.char-3 { left: 60%; animation-delay: 0.6s; }
.char-4 { left: 80%; animation-delay: 0.9s; }

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* ===== SECTIONS ===== */
.section { padding: 4rem 0; }
.section-alt { background: rgba(19,25,41,0.5); }

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 2.5rem;
}

.text-center { text-align: center; }
.mt-4 { margin-top: 2rem; }

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
}

.feature-icon { font-size: 2.5rem; margin-bottom: 1rem; }
.feature-card h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.feature-card p { color: var(--text-muted); font-size: 0.9rem; }

/* Module cards */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.module-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.25s;
    border-top: 3px solid var(--module-color, var(--primary));
}

.module-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.3);
    border-color: var(--module-color, var(--primary));
}

.module-icon { font-size: 2.5rem; display: block; margin-bottom: 1rem; }
.module-card h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.module-card p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1rem; }
.module-link { color: var(--module-color, var(--primary)); font-weight: 700; font-size: 0.9rem; }

/* Start today */
.start-today-panel {
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem;
    background:
        radial-gradient(ellipse at 20% 0%, rgba(51, 103, 145, 0.25), transparent 55%),
        radial-gradient(ellipse at 80% 100%, rgba(16, 185, 129, 0.12), transparent 50%),
        linear-gradient(160deg, rgba(19, 25, 41, 0.9), rgba(30, 41, 59, 0.55));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.start-today-label {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #7dd3a7;
    margin-bottom: 0.75rem;
}
.start-today-panel h2 {
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    font-weight: 800;
    margin-bottom: 0.75rem;
}
.start-today-panel > p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.55;
}
.start-today-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

/* CTA */
.cta-box {
    text-align: center;
    background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(16,185,129,0.1));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
}

.cta-snake { font-size: 4rem; margin-bottom: 1rem; }
.cta-box h2 { font-size: 2rem; margin-bottom: 0.5rem; }
.cta-box p { color: var(--text-muted); margin-bottom: 1.5rem; }

/* ===== PAGE HEADER ===== */
.page-header {
    padding: 3rem 0 2rem;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(99,102,241,0.06) 0%, transparent 100%);
}

.page-header-sm { padding: 2rem 0 1.5rem; }

.page-header h1 { font-size: 2rem; font-weight: 800; }
.page-header p { color: var(--text-muted); margin-top: 0.5rem; }

.breadcrumb {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    display: inline-block;
    margin-bottom: 1rem;
}

.breadcrumb:hover { color: var(--primary); }

/* ===== AUTH ===== */
.auth-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
    padding: 2rem;
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow);
}

.auth-header { text-align: center; margin-bottom: 2rem; }
.auth-emoji { font-size: 3rem; display: block; margin-bottom: 0.5rem; }
.auth-header h1 { font-size: 1.5rem; }
.auth-header p { color: var(--text-muted); }

.auth-form { display: flex; flex-direction: column; gap: 1rem; }
.auth-footer { text-align: center; margin-top: 1.5rem; color: var(--text-muted); font-size: 0.9rem; }
.auth-footer a { color: var(--primary); font-weight: 600; }

/* Forms */
.form-group { display: flex; flex-direction: column; gap: 0.35rem; }
.form-group label { font-weight: 600; font-size: 0.9rem; }

.form-input, .code-editor {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.7rem 1rem;
    color: var(--text);
    font-family: var(--font);
    font-size: 0.95rem;
    transition: border-color 0.2s;
    width: 100%;
}

.code-editor {
    font-family: var(--mono);
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    tab-size: 4;
}

.form-input:focus, .code-editor:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

.form-error { color: var(--danger); font-size: 0.85rem; }
.form-help { color: var(--text-muted); font-size: 0.8rem; }

/* ===== DASHBOARD ===== */
.dashboard-welcome {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.welcome-avatar { font-size: 3rem; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon { font-size: 2rem; }
.stat-card strong { display: block; font-size: 1.25rem; }
.stat-card small { color: var(--text-muted); font-size: 0.85rem; }

.progress-bar {
    height: 6px;
    background: var(--bg);
    border-radius: 3px;
    margin: 0.4rem 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 3px;
    transition: width 0.5s;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

.dashboard-main h2, .dashboard-side h2 {
    font-size: 1.15rem;
    margin-bottom: 1rem;
}

.course-progress-list { display: flex; flex-direction: column; gap: 0.75rem; }

.course-progress-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    text-decoration: none;
    color: var(--text);
    transition: border-color 0.2s;
    border-left: 3px solid var(--module-color, var(--primary));
}

.course-progress-item:hover { border-color: var(--module-color, var(--primary)); }

.cp-icon { font-size: 1.75rem; }
.cp-info strong { display: block; }
.cp-info small { color: var(--text-muted); font-size: 0.85rem; }
.cp-arrow { margin-left: auto; color: var(--text-muted); }

.quick-actions { display: flex; flex-direction: column; gap: 0.5rem; }

.quick-action {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    transition: all 0.2s;
}

.quick-action:hover {
    border-color: var(--primary);
    background: rgba(99,102,241,0.08);
}

.quick-action span { font-size: 1.25rem; }

.recent-list { list-style: none; }
.recent-list li { padding: 0.5rem 0; border-bottom: 1px solid var(--border); }
.recent-list a { color: var(--text-muted); text-decoration: none; font-size: 0.9rem; }
.recent-list a:hover { color: var(--primary); }

/* ===== LESSONS ===== */
.module-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.module-icon-lg { font-size: 3.5rem; }

.content-grid {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 2rem;
}

.lesson-list { display: flex; flex-direction: column; gap: 0.5rem; }

.lesson-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
}

.lesson-item:hover { border-color: var(--primary); transform: translateX(4px); }
.lesson-item.completed { border-left: 3px solid var(--success); }

.lesson-num {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.lesson-emoji { font-size: 1.5rem; }
.lesson-info strong { display: block; }
.lesson-info small { color: var(--text-muted); font-size: 0.85rem; }
.lesson-arrow, .lesson-check { margin-left: auto; }

.lesson-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lesson-emoji-lg { font-size: 3rem; }

.lesson-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    line-height: 1.8;
}

.lesson-content h2 { font-size: 1.5rem; margin: 1.5rem 0 0.75rem; color: var(--primary); }
.lesson-content h3 { font-size: 1.2rem; margin: 1.25rem 0 0.5rem; }
.lesson-content p { margin-bottom: 1rem; color: var(--text-muted); }
.lesson-content blockquote {
    border-left: 3px solid var(--accent);
    padding: 0.75rem 1.25rem;
    margin: 1rem 0;
    background: rgba(16,185,129,0.08);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
}

.code-block {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    font-family: var(--mono);
    font-size: 0.88rem;
    overflow-x: auto;
    margin: 1rem 0;
}

.inline-code {
    background: rgba(99,102,241,0.15);
    color: #a5b4fc;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.88em;
}

.md-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.md-table th, .md-table td {
    border: 1px solid var(--border);
    padding: 0.6rem 1rem;
    text-align: left;
}

.md-table th { background: var(--bg-elevated); }

.lesson-sidebar { display: flex; flex-direction: column; gap: 1rem; }
.lesson-nav { display: flex; flex-direction: column; gap: 0.5rem; }
.lesson-nav a { color: var(--text-muted); text-decoration: none; font-size: 0.9rem; }
.lesson-nav a:hover { color: var(--primary); }

.content-sidebar h3 { font-size: 1rem; margin-bottom: 0.75rem; }

.sidebar-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--text);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.sidebar-item span { color: var(--accent); font-weight: 700; font-size: 0.8rem; }

/* ===== EXERCISES ===== */
.exercises-section { margin-top: 3rem; }
.exercises-section h2 { font-size: 1.5rem; margin-bottom: 1.5rem; }

.exercise-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
}

.exercise-card h3 { margin-bottom: 0.75rem; }

.xp-tag {
    background: rgba(245,158,11,0.15);
    color: var(--accent-2);
    padding: 0.15rem 0.5rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
}

.exercise-question { color: var(--text-muted); margin-bottom: 1rem; }

.quiz-options { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 1rem; }

.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color 0.2s;
}

.quiz-option:hover { border-color: var(--primary); }
.quiz-option input { accent-color: var(--primary); }

.exercise-result {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    display: none;
}

.exercise-result.show { display: block; }
.exercise-result.success { background: rgba(34,197,94,0.12); color: var(--success); }
.exercise-result.error { background: rgba(239,68,68,0.12); color: var(--danger); }

/* ===== HOMEWORK ===== */
.homework-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.homework-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
}

.homework-card:hover { border-color: var(--primary); transform: translateY(-2px); }

.hw-module { color: var(--text-muted); font-size: 0.85rem; }
.homework-card h3 { margin: 0.5rem 0; }
.homework-card p { color: var(--text-muted); font-size: 0.9rem; }

.hw-footer {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1rem;
}

.hw-status { font-size: 0.85rem; font-weight: 600; }
.status-approved { color: var(--success); }
.status-rejected { color: var(--danger); }
.status-pending { color: var(--accent-2); }

.homework-block {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.homework-block h3 { margin-bottom: 0.5rem; font-size: 1rem; }

.requirements {
    white-space: pre-wrap;
    font-family: var(--font);
    color: var(--text-muted);
    line-height: 1.7;
}

/* ===== TRAINER ===== */
.trainer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1rem;
}

.trainer-card {
    display: flex;
    gap: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
}

.trainer-card:hover { border-color: var(--primary); }
.trainer-card.solved { border-left: 3px solid var(--success); }

.trainer-icon { font-size: 2rem; flex-shrink: 0; }
.trainer-icon-lg { font-size: 3rem; }

.trainer-card h3 { font-size: 1.05rem; margin-bottom: 0.25rem; }
.trainer-card p { color: var(--text-muted); font-size: 0.85rem; }

.trainer-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    flex-wrap: wrap;
}

.difficulty-badge {
    padding: 0.15rem 0.5rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
}

.difficulty-badge.easy { background: rgba(34,197,94,0.15); color: var(--success); }
.difficulty-badge.medium { background: rgba(245,158,11,0.15); color: var(--accent-2); }
.difficulty-badge.hard { background: rgba(239,68,68,0.15); color: var(--danger); }

.trainer-header { display: flex; align-items: center; gap: 1rem; }
.solved-badge { color: var(--success); font-weight: 700; }

.trainer-workspace {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 1.5rem;
}

.trainer-description h3 { margin-bottom: 0.5rem; }

.hint-box {
    margin-top: 1rem;
    background: rgba(245,158,11,0.08);
    border: 1px solid rgba(245,158,11,0.2);
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
}

.hint-box summary { cursor: pointer; font-weight: 600; color: var(--accent-2); }

.trainer-editor {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.editor-toolbar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
}

.editor-toolbar span { flex: 1; font-family: var(--mono); font-size: 0.85rem; color: var(--text-muted); }

.code-editor-lg { min-height: 250px; border: none; border-radius: 0; }

.output-panel {
    border-top: 1px solid var(--border);
}

.output-header {
    padding: 0.5rem 1rem;
    background: var(--bg-elevated);
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
}

#output-area {
    padding: 1rem;
    font-family: var(--mono);
    font-size: 0.88rem;
    min-height: 80px;
    color: var(--text-muted);
    white-space: pre-wrap;
}

#output-area.success { color: var(--success); }

/* ===== ABOUT ===== */
.about-content { max-width: 800px; margin: 0 auto; }

.about-hero { text-align: center; margin-bottom: 3rem; }
.about-logo { width: 100px; height: 100px; margin-bottom: 1.5rem; }

.about-hero blockquote {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin: 1rem 0;
    font-style: italic;
}

.about-hero blockquote.highlight {
    color: var(--accent);
    font-weight: 700;
    font-style: normal;
    font-size: 1.25rem;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.about-card h3 { margin-bottom: 0.5rem; }
.about-card p { color: var(--text-muted); font-size: 0.9rem; }

/* ===== ALERTS ===== */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-weight: 600;
}

.alert-success { background: rgba(34,197,94,0.12); color: var(--success); }
.alert-error { background: rgba(239,68,68,0.12); color: var(--danger); }
.alert-info { background: rgba(99,102,241,0.12); color: var(--primary); }

.messages-container { padding-top: 1rem; }

/* ===== FOOTER ===== */
.footer {
    border-top: 1px solid var(--border);
    padding: 2.5rem 0;
    margin-top: 3rem;
    position: relative;
    z-index: 1;
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: flex-start;
    justify-content: space-between;
}

.footer-brand strong { font-size: 1.1rem; }
.footer-brand p { color: var(--text-muted); font-size: 0.85rem; margin-top: 0.25rem; }

.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { color: var(--text-muted); text-decoration: none; font-size: 0.9rem; }
.footer-links a:hover { color: var(--text); }

.footer-copy {
    width: 100%;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; }
    .hero-visual { order: -1; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .dashboard-grid { grid-template-columns: 1fr; }
    .content-grid { grid-template-columns: 1fr; }
    .trainer-workspace { grid-template-columns: 1fr; }
    .about-grid { grid-template-columns: 1fr; }
    .nav-links { display: none; }
}

@media (max-width: 600px) {
    .hero h1 { font-size: 2rem; }
    .features-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; }
    .hero-stats { gap: 1.5rem; }
    .avatar-grid { grid-template-columns: repeat(4, 1fr); }
}

.homework-card.is-project {
    border-color: rgba(245,158,11,0.45);
    background: linear-gradient(160deg, rgba(245,158,11,0.08), var(--bg-card));
}

.project-item {
    border-left: 3px solid var(--accent-2);
}

.streak-chip {
    margin-left: auto;
    background: rgba(245,158,11,0.15);
    color: var(--accent-2);
    padding: 0.55rem 1rem;
    border-radius: 999px;
    font-weight: 800;
    white-space: nowrap;
}

.daily-goal-card {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
}

.daily-goal-info h2 { font-size: 1.15rem; margin-bottom: 0.25rem; }
.daily-goal-info p { color: var(--text-muted); font-size: 0.9rem; }

.daily-goal-progress {
    min-width: 240px;
    text-align: right;
}

.progress-bar-lg { height: 10px; margin: 0.5rem 0; }

.goal-done {
    display: inline-block;
    margin-top: 0.35rem;
    color: var(--success);
    font-weight: 700;
    font-size: 0.85rem;
}

@media (max-width: 700px) {
    .dashboard-welcome { flex-wrap: wrap; }
    .streak-chip { margin-left: 0; }
    .daily-goal-card { flex-direction: column; align-items: stretch; }
    .daily-goal-progress { text-align: left; min-width: 0; }
}

.day-plan-list { display: flex; flex-direction: column; gap: 0.85rem; }

.day-card {
    display: flex;
    gap: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    align-items: flex-start;
}

.day-card.done { border-left: 3px solid var(--success); }

.day-num {
    flex-shrink: 0;
    font-weight: 800;
    color: var(--primary);
    min-width: 70px;
}

.day-body h3 { font-size: 1.05rem; margin-bottom: 0.35rem; }
.day-body p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 0.75rem; }
.day-body .btn { margin-right: 0.5rem; margin-bottom: 0.35rem; }

.module-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin: 0.75rem 0;
}

/* ===== PROFILE & ACHIEVEMENTS ===== */
.nav-achievements {
    font-size: 1.25rem;
    text-decoration: none;
    padding: 0.25rem;
    transition: transform 0.2s;
}

.nav-achievements:hover { transform: scale(1.15); }

.profile-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
    align-items: start;
}

.profile-main {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.profile-preview {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.profile-avatar-display {
    font-size: 4rem;
    width: 90px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    border-radius: 50%;
    border: 3px solid var(--primary);
}

.profile-preview strong { display: block; font-size: 1.25rem; }
.profile-preview small { color: var(--text-muted); }

.avatar-picker-title { margin: 1.5rem 0 1rem; font-size: 1rem; }

.avatar-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.avatar-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem 0.5rem;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font);
    color: var(--text);
    position: relative;
}

.avatar-option:hover:not(.locked) {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.avatar-option.selected {
    border-color: var(--primary);
    background: rgba(99,102,241,0.12);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.2);
}

.avatar-option.locked {
    opacity: 0.45;
    cursor: not-allowed;
    filter: grayscale(0.5);
}

.avatar-emoji { font-size: 2rem; }
.avatar-name { font-size: 0.7rem; color: var(--text-muted); }
.lock-icon { position: absolute; top: 4px; right: 4px; font-size: 0.75rem; }

.profile-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.achievements-summary, .stats-mini {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
}

.achievements-summary h3, .stats-mini h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.achievements-count {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.achievements-count strong { color: var(--accent-2); }

.achievements-mini {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.ach-badge {
    font-size: 1.5rem;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.ach-more {
    font-size: 0.85rem;
    color: var(--text-muted);
    align-self: center;
}

.stats-mini ul { list-style: none; }
.stats-mini li {
    padding: 0.4rem 0;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
}

.ach-section-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.achievement-card {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: transform 0.2s;
}

.achievement-card.earned {
    border-left: 3px solid var(--success);
}

.achievement-card.locked {
    opacity: 0.85;
}

.achievement-card.secret {
    border-style: dashed;
    opacity: 0.6;
}

.ach-icon { font-size: 2.5rem; flex-shrink: 0; }

.achievement-card strong { display: block; margin-bottom: 0.25rem; }
.achievement-card p { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 0.5rem; }

.progress-bar-sm { height: 4px; margin: 0.5rem 0 0.25rem; }

.achievement-toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--success);
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow);
    z-index: 1000;
    animation: slideIn 0.4s ease;
    max-width: 320px;
}

.achievement-toast strong { display: block; color: var(--success); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@media (max-width: 900px) {
    .profile-grid { grid-template-columns: 1fr; }
    .avatar-grid { grid-template-columns: repeat(5, 1fr); }
}