/* PythonPath AI - Dark Theme */

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --border: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --green: #3fb950;
    --green-bg: rgba(63,185,80,0.15);
    --blue: #58a6ff;
    --blue-bg: rgba(88,166,255,0.15);
    --purple: #bc8cff;
    --purple-bg: rgba(188,140,255,0.15);
    --orange: #d29922;
    --orange-bg: rgba(210,153,34,0.15);
    --red: #f85149;
    --red-bg: rgba(248,81,73,0.15);
    --yellow: #e3b341;
    --yellow-bg: rgba(227,179,65,0.15);
    --gray: #8b949e;
    --gray-bg: rgba(139,148,158,0.15);
    --github: #238636;
    --github-hover: #2ea043;
    --radius: 8px;
    --radius-lg: 16px;
    --shadow: 0 2px 8px rgba(0,0,0,0.4);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.5);
    --transition: 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-text-size-adjust: 100%;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Navbar */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    position: relative;
}
.nav-brand {
    color: var(--green);
    font-weight: 800;
    font-size: 1.15rem;
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
    z-index: 110;
}

/* Hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 5px;
    z-index: 110;
    -webkit-tap-highlight-color: transparent;
}
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.3s cubic-bezier(.4,0,.2,1), opacity 0.3s;
    transform-origin: center;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Nav Links */
.nav-links {
    display: flex;
    align-items: center;
    gap: 0;
}
.nav-section {
    display: flex;
    align-items: center;
    gap: 0;
}
.nav-section a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 6px;
    transition: color var(--transition), background var(--transition);
    white-space: nowrap;
}
.nav-section a:hover { color: var(--text-primary); background: var(--bg-tertiary); }
.nav-section a.active { color: var(--text-primary); background: var(--bg-tertiary); }
.nav-admin { color: var(--orange) !important; }
.nav-admin:hover { color: var(--orange) !important; }

/* User area */
.nav-user { margin-left: 8px; padding-left: 8px; border-left: 1px solid var(--border); }
.nav-user-area { position: relative; }
.nav-avatar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: background var(--transition);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}
.nav-avatar:hover { background: var(--bg-tertiary); }
.nav-avatar-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent);
    color: #000;
    font-weight: 700;
    font-size: 0.8rem;
    flex-shrink: 0;
}

/* Dropdown */
.nav-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 4px);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    min-width: 180px;
    padding: 4px;
    box-shadow: var(--shadow-lg);
    z-index: 200;
}
.nav-user-area:hover .nav-dropdown,
.nav-user-area.open .nav-dropdown { display: block; }
.nav-dropdown a {
    display: block;
    padding: 8px 14px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-radius: 4px;
    transition: background var(--transition), color var(--transition);
}
.nav-dropdown a:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.nav-dropdown-divider { height: 1px; background: var(--border); margin: 4px 8px; }
.nav-logout { color: var(--red) !important; }
.nav-logout:hover { color: var(--red) !important; background: var(--red-bg) !important; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 10px 20px; border-radius: var(--radius); border: none;
    font-size: 0.9rem; font-weight: 600; cursor: pointer;
    text-decoration: none; transition: all var(--transition);
}
.btn-primary { background: var(--accent); color: #000; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-primary); }
.btn-outline:hover { background: var(--bg-tertiary); border-color: var(--text-secondary); }
.btn-ghost { background: transparent; color: var(--text-secondary); padding: 6px 12px; }
.btn-ghost:hover { color: var(--text-primary); }
.btn-github { background: var(--github); color: #fff; }
.btn-github:hover { background: var(--github-hover); }
.btn-danger { background: var(--red); color: #fff; }
.btn-danger:hover { opacity: 0.9; }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 6px; font-weight: 500; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 10px 14px; background: var(--bg-primary);
    border: 1px solid var(--border); border-radius: var(--radius);
    color: var(--text-primary); font-size: 0.95rem;
    font-family: inherit; transition: border-color var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--accent);
}
.form-group textarea { resize: vertical; }

/* Alerts */
.alert { padding: 14px 20px; border-radius: var(--radius); margin: 16px 0; font-size: 0.9rem; }
.alert-success { background: var(--green-bg); color: var(--green); border: 1px solid rgba(63,185,80,0.3); }
.alert-error { background: var(--red-bg); color: var(--red); border: 1px solid rgba(248,81,73,0.3); }
.alert-warning { background: var(--yellow-bg); color: var(--yellow); border: 1px solid rgba(227,179,65,0.3); }

/* Hero */
.hero { text-align: center; padding: 80px 0 60px; }
.hero h1 { font-size: 3rem; font-weight: 800; line-height: 1.1; margin-bottom: 24px; }
.hero-sub { font-size: 1.2rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 48px; flex-wrap: wrap; }
.gradient-text { background: linear-gradient(135deg, var(--green), var(--blue), var(--purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-stats { display: flex; gap: 48px; justify-content: center; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; align-items: center; }
.stat-num { font-size: 1.8rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 0.85rem; color: var(--text-secondary); }

/* Features */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; padding: 60px 0; }
.feature-card {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 32px; text-align: center;
    transition: border-color var(--transition);
}
.feature-card:hover { border-color: var(--accent); }
.feature-icon { font-size: 2.5rem; margin-bottom: 16px; }
.feature-card h3 { margin-bottom: 10px; font-size: 1.1rem; }
.feature-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* Journey */
.curriculum-preview { padding: 60px 0; text-align: center; }
.curriculum-preview h2 { font-size: 2rem; margin-bottom: 40px; }
.journey-phases { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.phase-card {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 28px; text-align: center;
}
.phase-card h3 { font-size: 1rem; margin-bottom: 6px; }
.phase-card p { font-weight: 600; margin-bottom: 8px; }
.phase-card span { font-size: 0.85rem; color: var(--text-secondary); }
.phase-beginner { border-top: 3px solid var(--green); }
.phase-beginner h3 { color: var(--green); }
.phase-intermediate { border-top: 3px solid var(--blue); }
.phase-intermediate h3 { color: var(--blue); }
.phase-advanced { border-top: 3px solid var(--purple); }
.phase-advanced h3 { color: var(--purple); }
.phase-portfolio { border-top: 3px solid var(--orange); }
.phase-portfolio h3 { color: var(--orange); }

/* Auth */
.auth-page { display: flex; justify-content: center; padding: 60px 0; }
.auth-card {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 40px; width: 100%; max-width: 440px;
}
.auth-card h1 { text-align: center; margin-bottom: 8px; }
.auth-card > p { text-align: center; color: var(--text-secondary); margin-bottom: 24px; }
.auth-switch { text-align: center; margin-top: 20px; color: var(--text-secondary); font-size: 0.9rem; }
.auth-switch a { color: var(--accent); }
.divider { text-align: center; margin: 24px 0; color: var(--text-muted); position: relative; }
.divider::before { content: ''; position: absolute; left: 0; top: 50%; width: 100%; height: 1px; background: var(--border); }
.divider span { background: var(--bg-secondary); padding: 0 12px; position: relative; z-index: 1; }

/* Dashboard */
.dash-header { margin-bottom: 30px; }
.dash-header h1 { font-size: 1.8rem; margin-bottom: 16px; }
.dash-progress-bar { display: flex; align-items: center; gap: 14px; }
.progress-track { flex: 1; height: 10px; background: var(--bg-tertiary); border-radius: 5px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--green), var(--accent)); border-radius: 5px; transition: width 0.5s; }
.dash-progress-bar span { color: var(--text-secondary); font-size: 0.85rem; white-space: nowrap; }

.dash-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 30px; }
.stat-card {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px; text-align: center;
    display: flex; flex-direction: column; gap: 6px;
}
.stat-card .stat-icon { font-size: 1.8rem; }
.stat-card .stat-value { font-size: 1.6rem; font-weight: 800; color: var(--accent); }
.stat-card .stat-name { font-size: 0.8rem; color: var(--text-secondary); }

.dash-main { display: grid; gap: 24px; }
.dash-continue h2 { margin-bottom: 16px; }

.day-card {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 28px; cursor: pointer;
    transition: border-color var(--transition);
}
.day-card:hover { border-color: var(--accent); }
.day-phase {
    display: inline-block; padding: 4px 10px; border-radius: 4px;
    font-size: 0.75rem; font-weight: 600; margin-bottom: 12px;
    text-transform: uppercase; letter-spacing: 0.05em;
}
.phase-green { background: var(--green-bg); color: var(--green); }
.phase-blue { background: var(--blue-bg); color: var(--blue); }
.phase-purple { background: var(--purple-bg); color: var(--purple); }
.phase-orange { background: var(--orange-bg); color: var(--orange); }
.day-card h3 { margin-bottom: 8px; }
.day-card p { color: var(--text-secondary); margin-bottom: 12px; }
.day-meta { display: flex; gap: 16px; font-size: 0.85rem; color: var(--text-secondary); flex-wrap: wrap; }

.difficulty { font-weight: 600; font-size: 0.8rem; }
.difficulty-green { color: var(--green); }
.difficulty-yellow { color: var(--yellow); }
.difficulty-red { color: var(--red); }
.difficulty-gray { color: var(--gray); }

.dash-alert {
    background: var(--yellow-bg); border: 1px solid rgba(227,179,65,0.3);
    border-radius: var(--radius-lg); padding: 24px;
}
.dash-alert h3 { color: var(--yellow); margin-bottom: 12px; }
.skill-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.tag { padding: 4px 10px; border-radius: 4px; font-size: 0.8rem; font-weight: 500; }
.tag-warning { background: rgba(227,179,65,0.2); color: var(--yellow); }
.alert-action { font-size: 0.85rem; color: var(--text-secondary); }

/* Curriculum */
.curriculum-page h1 { margin-bottom: 8px; }
.page-sub { color: var(--text-secondary); margin-bottom: 30px; }
.phase-section { margin-bottom: 40px; }
.phase-title { font-size: 1.3rem; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--border); }
.phase-title.phase-green { color: var(--green); border-color: var(--green); }
.phase-title.phase-blue { color: var(--blue); border-color: var(--blue); }
.phase-title.phase-purple { color: var(--purple); border-color: var(--purple); }
.phase-title.phase-orange { color: var(--orange); border-color: var(--orange); }

.day-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); gap: 8px; }
.curriculum-day {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 12px 8px; text-align: center;
    display: flex; flex-direction: column; align-items: center; gap: 4px;
    font-size: 0.8rem;
}
.curriculum-day.clickable { cursor: pointer; transition: all var(--transition); text-decoration: none; color: inherit; }
.curriculum-day.clickable:hover { border-color: var(--accent); background: var(--bg-tertiary); }
.curriculum-day.completed { border-color: var(--green); background: var(--green-bg); }
.curriculum-day.mastered { border-color: var(--green); background: var(--green-bg); }
.curriculum-day.available { border-color: var(--accent); }
.curriculum-day.in_progress { border-color: var(--yellow); background: var(--yellow-bg); }
.day-num { font-weight: 800; font-size: 1rem; color: var(--text-primary); }
.day-title { font-size: 0.65rem; color: var(--text-secondary); line-height: 1.3; }
.day-status { font-size: 0.8rem; }

/* Day Page */
.day-page { padding: 30px 0; }
.back-link { color: var(--accent); text-decoration: none; font-size: 0.9rem; display: inline-block; margin-bottom: 20px; }
.back-link:hover { text-decoration: underline; }
.day-breadcrumb { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; font-size: 0.85rem; color: var(--text-secondary); }
.phase-badge { padding: 3px 10px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; }
.day-header h1 { font-size: 1.6rem; }
.day-header h2 { color: var(--text-secondary); font-weight: 500; margin-bottom: 12px; }
.day-subtitle { color: var(--text-secondary); margin-bottom: 12px; }
.day-meta-bar { display: flex; gap: 20px; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 20px; flex-wrap: wrap; }
.day-progress-bar { margin-bottom: 30px; display: flex; align-items: center; gap: 12px; }
.day-progress-bar span { font-size: 0.85rem; color: var(--text-secondary); }

.day-section { margin-bottom: 40px; }
.day-section h2 { font-size: 1.3rem; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }

.objectives-list { list-style: none; padding: 0; }
.objectives-list li { padding: 10px 0; border-bottom: 1px solid var(--border); color: var(--green); font-size: 0.95rem; }
.objectives-list li:last-child { border: none; }

.lesson-content { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px; line-height: 1.8; }
.lesson-content h3 { color: var(--accent); margin: 20px 0 10px; }
.lesson-content p { margin-bottom: 12px; color: var(--text-secondary); }
.lesson-content code { background: var(--bg-tertiary); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; color: var(--green); }
.lesson-content pre { background: var(--bg-primary); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; overflow-x: auto; margin: 12px 0; }
.lesson-content pre code { background: none; padding: 0; color: var(--text-primary); }
.lesson-content ul, .lesson-content ol { padding-left: 24px; margin-bottom: 12px; color: var(--text-secondary); }

.challenges-list { display: flex; flex-direction: column; gap: 10px; }
.challenge-item {
    display: flex; align-items: center; gap: 16px;
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 16px 20px;
    text-decoration: none; color: inherit; transition: border-color var(--transition);
}
.challenge-item:hover { border-color: var(--accent); }
.challenge-num { font-size: 1.2rem; font-weight: 800; color: var(--text-muted); min-width: 30px; }
.challenge-info { flex: 1; }
.challenge-info h3 { font-size: 1rem; margin-bottom: 4px; }
.challenge-xp { font-size: 0.8rem; color: var(--accent); margin-left: 10px; }
.challenge-arrow { font-size: 1.2rem; color: var(--text-muted); }
.challenge-main { border-color: var(--accent); }
.challenge-main h3 { color: var(--accent); }

/* Challenge Page */
.challenge-page { padding: 30px 0; max-width: 900px; margin: 0 auto; }
.challenge-header { margin-bottom: 30px; }
.challenge-type-badge { display: inline-block; padding: 4px 12px; border-radius: 4px; font-size: 0.8rem; font-weight: 600; background: var(--blue-bg); color: var(--blue); margin-bottom: 12px; }
.challenge-meta { display: flex; gap: 16px; margin-top: 8px; font-size: 0.85rem; color: var(--text-secondary); flex-wrap: wrap; }
.challenge-desc, .challenge-reqs, .challenge-starter, .challenge-hints, .challenge-submit { margin-bottom: 30px; }
.challenge-desc h2, .challenge-reqs h2, .challenge-starter h2, .challenge-hints h2, .challenge-submit h2 { font-size: 1.2rem; margin-bottom: 16px; }
.desc-content { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; line-height: 1.8; color: var(--text-secondary); white-space: pre-wrap; word-wrap: break-word; }
.reqs-list { padding-left: 20px; }
.reqs-list li { margin-bottom: 10px; color: var(--text-secondary); line-height: 1.6; }
.challenge-starter pre { background: var(--bg-primary); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; overflow-x: auto; }
.challenge-starter code { font-size: 0.9rem; color: var(--green); }

.hints-list { display: flex; flex-direction: column; gap: 8px; }
.hint-item { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); }
.hint-item.viewed { border-color: var(--green); }
.hint-btn {
    width: 100%; padding: 14px 20px; background: none; border: none;
    color: var(--text-primary); font-size: 0.95rem; cursor: pointer;
    text-align: left; display: flex; align-items: center; gap: 10px;
}
.hint-btn:hover { color: var(--accent); }
.hint-content { padding: 14px 20px; border-top: 1px solid var(--border); color: var(--text-secondary); line-height: 1.6; }

.submit-info { margin-bottom: 20px; }
.submit-info p { color: var(--text-secondary); margin-bottom: 6px; }
.submit-tip { font-size: 0.85rem; }
.submit-tip a { color: var(--accent); }
.submit-checklist { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; margin-bottom: 20px; }
.submit-checklist p { margin-bottom: 6px; color: var(--text-secondary); font-size: 0.9rem; }
.submit-form { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; }
.submit-form textarea { min-height: 120px; }

/* Submission Result */
.result-page { padding: 30px 0; max-width: 900px; margin: 0 auto; }
.result-header { text-align: center; padding: 30px; border-radius: var(--radius-lg); margin-bottom: 30px; }
.result-pass { background: var(--green-bg); border: 1px solid rgba(63,185,80,0.3); }
.result-pass h1 { color: var(--green); }
.result-fail { background: var(--yellow-bg); border: 1px solid rgba(227,179,65,0.3); }
.result-fail h1 { color: var(--yellow); }

.result-waiting { text-align: center; padding: 60px 0; }
.spinner { width: 48px; height: 48px; border: 4px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 20px; }
@keyframes spin { to { transform: rotate(360deg); } }
.result-waiting h2 { margin-bottom: 10px; }
.result-waiting p { color: var(--text-secondary); margin-bottom: 20px; }

.result-score { text-align: center; margin-bottom: 30px; }
.score-circle {
    display: inline-flex; flex-direction: column; align-items: center;
    justify-content: center; width: 140px; height: 140px;
    border-radius: 50%; border: 4px solid; margin-bottom: 12px;
}
.score-circle.score-a, .score-circle.score-pass { border-color: var(--green); }
.score-circle.score-b { border-color: var(--blue); }
.score-circle.score-c { border-color: var(--yellow); }
.score-circle.score-f, .score-circle.score-fail { border-color: var(--red); }
.score-num { font-size: 2.5rem; font-weight: 800; line-height: 1; }
.score-label { font-size: 0.85rem; color: var(--text-secondary); }
.score-grade { font-size: 1.1rem; font-weight: 600; color: var(--text-secondary); }

.breakdown-grid { display: flex; flex-direction: column; gap: 12px; margin-bottom: 30px; }
.breakdown-item { display: flex; align-items: center; gap: 12px; }
.breakdown-label { min-width: 120px; font-size: 0.85rem; color: var(--text-secondary); }
.breakdown-bar { flex: 1; height: 8px; background: var(--bg-tertiary); border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--accent); border-radius: 4px; }
.breakdown-val { min-width: 40px; text-align: right; font-size: 0.85rem; font-weight: 600; }

.feedback-box { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; line-height: 1.8; color: var(--text-secondary); margin-bottom: 20px; white-space: pre-wrap; word-wrap: break-word; }
.feedback-section { margin-bottom: 16px; }
.feedback-section h3 { margin-bottom: 8px; font-size: 1rem; }
.feedback-strengths h3 { color: var(--green); }
.feedback-weaknesses h3 { color: var(--yellow); }
.feedback-suggestions h3 { color: var(--blue); }
.feedback-section ul { padding-left: 20px; }
.feedback-section li { margin-bottom: 6px; color: var(--text-secondary); line-height: 1.6; }

.result-actions { display: flex; gap: 12px; justify-content: center; margin-top: 30px; flex-wrap: wrap; }
.result-error { text-align: center; padding: 40px; }
.result-error p { color: var(--red); margin-bottom: 16px; }

/* Progress */
.progress-page h1 { margin-bottom: 24px; }
.progress-stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 40px; }
.progress-timeline { display: flex; flex-direction: column; gap: 8px; }
.timeline-item {
    display: flex; align-items: center; gap: 16px;
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 14px 20px;
}
.timeline-item.status-completed { border-left: 3px solid var(--green); }
.timeline-item.status-mastered { border-left: 3px solid var(--green); }
.timeline-item.status-in_progress { border-left: 3px solid var(--yellow); }
.timeline-day { font-weight: 800; min-width: 40px; color: var(--text-muted); }
.timeline-title { flex: 1; font-size: 0.9rem; }
.timeline-status { font-size: 0.8rem; color: var(--text-secondary); min-width: 80px; }
.timeline-xp { font-size: 0.8rem; color: var(--accent); }

/* Skills */
.skills-page h1 { margin-bottom: 8px; }
.skill-category { margin-bottom: 40px; }
.cat-title { font-size: 1.2rem; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--border); }
.cat-title.cat-green { color: var(--green); border-color: var(--green); }
.cat-title.cat-blue { color: var(--blue); border-color: var(--blue); }
.cat-title.cat-purple { color: var(--purple); border-color: var(--purple); }
.cat-title.cat-red { color: var(--red); border-color: var(--red); }
.cat-title.cat-orange { color: var(--orange); border-color: var(--orange); }
.skill-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.skill-card {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px; text-align: center;
}
.skill-card.mastery-mastered { border-color: var(--green); }
.skill-card.mastery-proficient { border-color: var(--blue); }
.skill-card.mastery-developing { border-color: var(--yellow); }
.skill-card.mastery-novice { border-color: var(--text-muted); }
.skill-icon { font-size: 1.8rem; margin-bottom: 8px; }
.skill-card h3 { font-size: 0.9rem; margin-bottom: 8px; }
.skill-level { display: flex; align-items: center; gap: 8px; }
.level-bar { flex: 1; height: 6px; background: var(--bg-tertiary); border-radius: 3px; overflow: hidden; }
.level-fill { height: 100%; background: var(--accent); border-radius: 3px; }
.skill-level span { font-size: 0.75rem; color: var(--text-secondary); min-width: 70px; }
.skill-warning { font-size: 0.8rem; color: var(--yellow); margin-top: 8px; display: block; }

/* Profile */
.profile-page h1 { margin-bottom: 24px; }
.profile-card { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 40px; text-align: center; margin-bottom: 30px; }
.profile-avatar img { width: 96px; height: 96px; border-radius: 50%; margin-bottom: 16px; }
.avatar-placeholder { display: inline-flex; align-items: center; justify-content: center; width: 96px; height: 96px; border-radius: 50%; background: var(--bg-tertiary); font-size: 2rem; font-weight: 800; margin-bottom: 16px; color: var(--accent); }
.profile-username { color: var(--text-secondary); margin-bottom: 12px; }
.profile-stats { display: flex; gap: 24px; justify-content: center; font-size: 0.9rem; color: var(--text-secondary); flex-wrap: wrap; }
.profile-form { max-width: 500px; }

/* Certificate */
.certificate-page { padding: 40px 0; }
.certificate-card { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 60px 40px; text-align: center; max-width: 700px; margin: 0 auto; }
.cert-border { border: 2px solid var(--accent); border-radius: var(--radius); padding: 40px; }
.cert-border h1 { font-size: 1.8rem; margin-bottom: 8px; }
.cert-border h2 { color: var(--green); margin-bottom: 24px; }
.cert-name { font-size: 1.2rem; margin-bottom: 16px; }
.cert-details { display: flex; gap: 24px; justify-content: center; margin: 20px 0; font-size: 0.9rem; color: var(--text-secondary); flex-wrap: wrap; }
.cert-code { margin-top: 20px; padding: 10px; background: var(--bg-primary); border-radius: var(--radius); font-size: 0.85rem; color: var(--text-secondary); word-break: break-all; }
.cert-verify { font-size: 0.8rem; color: var(--text-muted); margin-top: 10px; }

/* Verify */
.verify-page { padding: 60px 0; text-align: center; }
.verify-result { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 40px; max-width: 500px; margin: 0 auto; }
.verify-valid { border-color: var(--green); }
.verify-valid h2 { color: var(--green); }
.verify-invalid { border-color: var(--red); }
.verify-invalid h2 { color: var(--red); }

/* Submissions */
.submissions-page h1 { margin-bottom: 24px; }
.submissions-list { display: flex; flex-direction: column; gap: 8px; }
.submission-item {
    display: flex; align-items: center; gap: 16px;
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 14px 20px;
    text-decoration: none; color: inherit; transition: border-color var(--transition);
}
.submission-item:hover { border-color: var(--accent); }
.submission-item.status-completed { border-left: 3px solid var(--green); }
.submission-item.status-failed { border-left: 3px solid var(--red); }
.sub-day { font-weight: 800; min-width: 60px; color: var(--text-muted); }
.sub-title { flex: 1; font-size: 0.9rem; }
.sub-status { font-size: 0.8rem; color: var(--text-secondary); }
.sub-time { font-size: 0.8rem; color: var(--text-muted); }
.empty-state { text-align: center; padding: 60px 0; color: var(--text-secondary); }

/* Admin */
.admin-page { padding: 30px 0; }
.admin-page h1 { margin-bottom: 24px; }
.admin-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 30px; }
.admin-table { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; }
thead th { background: var(--bg-tertiary); padding: 12px 16px; text-align: left; font-size: 0.85rem; color: var(--text-secondary); white-space: nowrap; }
tbody td { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
tbody tr:hover { background: var(--bg-tertiary); }
.badge { padding: 3px 10px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; white-space: nowrap; }
.badge-completed { background: var(--green-bg); color: var(--green); }
.badge-pending { background: var(--yellow-bg); color: var(--yellow); }
.badge-failed { background: var(--red-bg); color: var(--red); }

.settings-form { max-width: 600px; }
.settings-form h2 { margin: 20px 0 16px; font-size: 1.1rem; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 24px 0; margin-top: 60px; }
.footer-content { display: flex; justify-content: space-between; align-items: center; color: var(--text-muted); font-size: 0.85rem; flex-wrap: wrap; gap: 12px; }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); text-decoration: none; }
.footer-links a:hover { color: var(--text-primary); }

/* Error */
.error-page { text-align: center; padding: 80px 0; }
.error-page h1 { font-size: 4rem; color: var(--red); margin-bottom: 12px; }
.error-page p { color: var(--text-secondary); margin-bottom: 24px; }

/* ============= RESPONSIVE ============= */

/* Tablets and below */
@media (max-width: 900px) {
    .dash-stats { grid-template-columns: repeat(2, 1fr); }
    .progress-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .admin-stats { grid-template-columns: repeat(2, 1fr); }
}

/* Mobile */
@media (max-width: 768px) {
    /* Navbar */
    .nav-toggle { display: flex; }

    .nav-links {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 8px 0;
        z-index: 100;
        box-shadow: var(--shadow-lg);
        max-height: calc(100vh - 56px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
    .nav-links.open { display: flex; }
    .nav-section {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 4px 0;
    }
    .nav-section + .nav-section {
        border-top: 1px solid var(--border);
        margin-top: 4px;
        padding-top: 4px;
    }
    .nav-section a {
        padding: 12px 20px;
        border-radius: 0;
        font-size: 0.95rem;
    }
    .nav-section a.active { background: var(--bg-tertiary); }

    /* Mobile user area */
    .nav-user {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
    }
    .nav-avatar { padding: 12px 20px; width: 100%; }
    .nav-avatar-icon {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }

    /* Mobile dropdown */
    .nav-dropdown {
        position: static;
        box-shadow: none;
        border: none;
        border-radius: 0;
        padding: 0 0 0 16px;
        min-width: 0;
        display: block;
    }
    .nav-dropdown a {
        padding: 10px 20px;
        font-size: 0.95rem;
    }

    /* Mobile button */
    .nav-section .btn { margin: 8px 20px; justify-content: center; padding: 12px 20px; }

    /* Hero */
    .hero { padding: 40px 0 30px; }
    .hero h1 { font-size: 1.8rem; }
    .hero-sub { font-size: 1rem; padding: 0 10px; }
    .hero-actions { flex-direction: column; align-items: center; gap: 12px; }
    .hero-actions .btn { width: 100%; max-width: 300px; }
    .hero-stats { gap: 24px; }
    .stat-num { font-size: 1.4rem; }

    /* Features */
    .features-grid { grid-template-columns: 1fr; padding: 30px 0; }
    .feature-card { padding: 24px; }

    /* Journey */
    .journey-phases { grid-template-columns: 1fr; }

    /* Auth */
    .auth-page { padding: 30px 0; }
    .auth-card { padding: 24px; margin: 0 12px; }

    /* Dashboard */
    .dash-header h1 { font-size: 1.4rem; }
    .dash-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .stat-card { padding: 16px 12px; }
    .stat-card .stat-value { font-size: 1.3rem; }
    .day-card { padding: 20px; }
    .day-meta { gap: 10px; }

    /* Curriculum */
    .day-grid { grid-template-columns: repeat(auto-fill, minmax(60px, 1fr)); gap: 6px; }
    .curriculum-day { padding: 10px 6px; }

    /* Day Page */
    .day-page { padding: 20px 0; }
    .day-header h1 { font-size: 1.3rem; }
    .lesson-content { padding: 20px; }
    .day-meta-bar { gap: 12px; }

    /* Challenge */
    .challenge-page { padding: 20px 0; }
    .desc-content { padding: 16px; }
    .submit-form { padding: 20px; }
    .submit-form textarea { min-height: 100px; }

    /* Result */
    .result-page { padding: 20px 0; }
    .result-header { padding: 20px; }
    .score-circle { width: 110px; height: 110px; }
    .score-num { font-size: 2rem; }
    .breakdown-label { min-width: 80px; font-size: 0.8rem; }
    .feedback-box { padding: 16px; }
    .result-actions { flex-direction: column; align-items: center; }
    .result-actions .btn { width: 100%; max-width: 300px; }

    /* Progress */
    .progress-stats-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .timeline-item { padding: 12px 14px; gap: 10px; flex-wrap: wrap; }
    .timeline-day { min-width: auto; }
    .timeline-status { min-width: auto; }

    /* Skills */
    .skill-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; }
    .skill-card { padding: 16px 12px; }

    /* Profile */
    .profile-card { padding: 24px; }
    .profile-stats { gap: 16px; }

    /* Certificate */
    .certificate-card { padding: 30px 20px; margin: 0 12px; }
    .cert-border { padding: 24px 16px; }
    .cert-details { gap: 12px; }

    /* Submissions */
    .submission-item { padding: 12px 14px; gap: 10px; flex-wrap: wrap; }
    .sub-day { min-width: auto; }

    /* Admin */
    .admin-page { padding: 20px 0; }
    .admin-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    thead th, tbody td { padding: 10px 12px; font-size: 0.8rem; }

    /* Footer */
    .footer { margin-top: 30px; }
    .footer-content { flex-direction: column; text-align: center; gap: 8px; }
    .footer-links { justify-content: center; }

    /* Error */
    .error-page { padding: 40px 0; }
    .error-page h1 { font-size: 3rem; }
}

/* Small phones */
@media (max-width: 480px) {
    .container { padding: 0 14px; }
    .hero h1 { font-size: 1.5rem; }
    .dash-stats { grid-template-columns: 1fr 1fr; gap: 8px; }
    .stat-card { padding: 14px 8px; }
    .stat-card .stat-value { font-size: 1.2rem; }
    .day-grid { grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); gap: 4px; }
    .curriculum-day { padding: 8px 4px; }
    .day-num { font-size: 0.9rem; }
    .day-title { font-size: 0.55rem; }
    .skill-grid { grid-template-columns: 1fr 1fr; }
    .auth-card { padding: 20px 16px; margin: 0 8px; }
    .certificate-card { padding: 20px 14px; margin: 0 8px; }
    .nav-section a { padding: 14px 20px; }
    .nav-dropdown a { padding: 12px 20px; }
}