/* 📊 DARKAIS DATA SCIENCE ACADEMY — MASTER STYLESHEET */
:root {
    --bg-dark: #05080E;
    --bg-main: #090E17;
    --bg-card: #101726;
    --bg-panel: #162033;
    --bg-glass: rgba(16, 23, 38, 0.92);
    
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --accent: #00E676;
    --accent-dark: #00A854;
    --accent-glow: rgba(0, 230, 118, 0.25);
    
    --cyan: #00F0FF;
    --purple: #A855F7;
    --danger: #FF3366;
    --warning: #FFB800;
    
    --border: #202D45;
    --border-light: #2A3C5C;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

body.theme-cyan { --accent: #00F0FF; --accent-dark: #0088A3; --accent-glow: rgba(0, 240, 255, 0.25); }
body.theme-purple { --accent: #C084FC; --accent-dark: #7E22CE; --accent-glow: rgba(192, 132, 252, 0.25); }
body.theme-gold { --accent: #FFB800; --accent-dark: #B38000; --accent-glow: rgba(255, 184, 0, 0.25); }

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif; }
body { background-color: var(--bg-dark); color: var(--text-primary); line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column; }
h1, h2, h3, h4, h5, h6 { font-family: 'Orbitron', sans-serif; letter-spacing: 0.5px; }
.mono { font-family: 'JetBrains Mono', monospace; }
a { color: inherit; text-decoration: none; transition: all 0.2s ease; }

.header { display: flex; justify-content: space-between; align-items: center; padding: 10px 24px; background: var(--bg-glass); backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.logo a { display: flex; align-items: center; gap: 8px; }
.logo h1 { font-size: 18px; font-weight: 700; }
.logo .accent { color: var(--accent); text-shadow: 0 0 10px var(--accent-glow); }

.nav { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.nav-link { color: var(--text-secondary); font-weight: 500; font-size: 12.5px; padding: 5px 8px; border-radius: var(--radius-sm); transition: all 0.2s; white-space: nowrap; }
.nav-link:hover, .nav-link.active { color: var(--accent); background: rgba(0, 230, 118, 0.08); }

.header-right { display: flex; align-items: center; gap: 10px; }
.header-star-btn { background: rgba(255, 184, 0, 0.1) !important; border: 1px solid rgba(255, 184, 0, 0.4) !important; color: #FFB800 !important; padding: 5px 11px !important; border-radius: 20px !important; font-size: 12px !important; font-weight: 700 !important; display: inline-flex !important; align-items: center; gap: 6px; }
.header-star-btn:hover { background: #FFB800 !important; color: #05070A !important; box-shadow: 0 0 16px rgba(255, 184, 0, 0.4) !important; transform: translateY(-1px); }

.search-trigger-btn { background: rgba(22, 32, 51, 0.9) !important; border: 1px solid var(--border-light) !important; color: var(--text-secondary) !important; padding: 5px 12px !important; border-radius: 20px !important; font-size: 12px !important; display: inline-flex !important; align-items: center; gap: 7px; cursor: pointer; outline: none; }
.search-trigger-btn:hover { border-color: var(--accent); color: var(--accent); box-shadow: 0 0 14px var(--accent-glow); }
.search-trigger-btn svg { width: 14px; height: 14px; stroke: currentColor; fill: none; }
.search-trigger-btn kbd { background: var(--bg-panel); border: 1px solid var(--border-light); padding: 1px 5px; border-radius: 4px; font-size: 10px; font-family: 'JetBrains Mono', monospace; color: var(--accent); }

.theme-picker { display: flex; align-items: center; gap: 5px; background: var(--bg-card); border: 1px solid var(--border); padding: 4px 8px; border-radius: 20px; }
.theme-dot { width: 12px; height: 12px; border-radius: 50%; cursor: pointer; transition: transform 0.2s; }
.theme-dot:hover { transform: scale(1.3); }
.theme-dot.matrix { background: #00E676; }
.theme-dot.cyan { background: #00F0FF; }
.theme-dot.purple { background: #C084FC; }
.theme-dot.gold { background: #FFB800; }

.icon-btn { background: var(--bg-card); border: 1px solid var(--border); color: var(--text-secondary); padding: 5px 8px; border-radius: var(--radius-sm); cursor: pointer; font-size: 12px; }
.progress-badge { display: flex; align-items: center; gap: 6px; background: var(--bg-card); border: 1px solid var(--border); padding: 4px 10px; border-radius: 20px; font-size: 11.5px; color: var(--text-secondary); }
.progress-badge .bar { width: 45px; height: 5px; background: var(--border); border-radius: 3px; overflow: hidden; }
.progress-badge .bar-fill { height: 100%; background: var(--accent); box-shadow: 0 0 8px var(--accent); transition: width 0.4s ease; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 9px 18px; border-radius: var(--radius-sm); font-family: 'Orbitron', sans-serif; font-size: 11.5px; font-weight: 700; cursor: pointer; border: 1px solid transparent; text-transform: uppercase; transition: all 0.2s ease; }
.btn-primary { background: var(--accent); color: #05070A; box-shadow: 0 0 15px var(--accent-glow); }
.btn-primary:hover { background: #fff; box-shadow: 0 0 25px var(--accent); transform: translateY(-2px); }
.btn-outline { background: transparent; border-color: var(--border-light); color: var(--text-primary); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: rgba(0, 230, 118, 0.05); }

.hero-wrapper { padding: 45px 20px 30px; text-align: center; background: radial-gradient(circle at 50% 20%, rgba(0, 230, 118, 0.1) 0%, transparent 65%), linear-gradient(180deg, var(--bg-card) 0%, var(--bg-dark) 100%); border-bottom: 1px solid var(--border); }
.hero-content { max-width: 900px; margin: 0 auto; }
.hero-tag { display: inline-block; padding: 4px 14px; background: rgba(0, 230, 118, 0.1); border: 1px solid var(--accent); color: var(--accent); border-radius: 20px; font-size: 11px; font-family: 'Orbitron', sans-serif; margin-bottom: 14px; text-transform: uppercase; }
.hero-title { font-size: 36px; line-height: 1.2; margin-bottom: 14px; font-weight: 800; }
.hero-title span.glow { color: var(--accent); text-shadow: 0 0 20px var(--accent-glow); }
.hero-desc { font-size: 15.5px; color: var(--text-secondary); margin-bottom: 26px; line-height: 1.6; }
.hero-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.academy-container { max-width: 1240px; margin: 0 auto; padding: 20px 20px 80px; width: 100%; flex: 1; }

.stats-strip { max-width: 1240px; margin: -22px auto 25px; padding: 0 20px; display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; position: relative; z-index: 10; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border); padding: 14px; border-radius: var(--radius-md); display: flex; align-items: center; gap: 12px; }
.stat-icon { width: 36px; height: 36px; background: rgba(0, 230, 118, 0.1); border: 1px solid var(--accent-dark); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 16px; color: var(--accent); }
.stat-info h4 { font-size: 15px; color: var(--text-primary); }
.stat-info p { font-size: 10.5px; color: var(--text-muted); text-transform: uppercase; }

.track-header { display: flex; align-items: center; justify-content: space-between; margin: 30px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.track-title { display: flex; align-items: center; gap: 10px; font-size: 18px; }
.track-title .track-badge { background: var(--bg-panel); border: 1px solid var(--border-light); color: var(--accent); font-size: 10px; padding: 2px 8px; border-radius: 12px; }
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 18px; }
.course-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 20px; display: flex; flex-direction: column; position: relative; transition: all 0.25s ease; }
.course-card:hover { transform: translateY(-3px); border-color: var(--accent-dark); box-shadow: 0 10px 25px rgba(0, 230, 118, 0.12); }
.course-card.completed { border-color: var(--accent); }
.course-card.completed::after { content: '✓ DONE'; position: absolute; top: 10px; right: 10px; font-size: 9px; font-weight: 700; font-family: 'Orbitron', sans-serif; color: var(--accent); background: rgba(0, 230, 118, 0.1); padding: 2px 6px; border-radius: 4px; border: 1px solid var(--accent); }
.course-card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.course-number { font-family: 'Orbitron', sans-serif; font-size: 11px; font-weight: 700; color: var(--accent); }
.course-duration { font-size: 11px; color: var(--text-muted); }
.course-card h3 { font-size: 17px; margin-bottom: 6px; }
.course-card p { font-size: 13px; color: var(--text-secondary); margin-bottom: 14px; flex: 1; }
.course-tags { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.tag { font-size: 10px; padding: 2px 6px; background: var(--bg-panel); border: 1px solid var(--border); border-radius: 4px; color: var(--text-muted); }
.tag.ds { color: var(--accent); border-color: var(--accent-dark); background: rgba(0, 230, 118, 0.08); }
.course-footer { display: flex; justify-content: space-between; align-items: center; padding-top: 10px; border-top: 1px solid var(--border); font-size: 12px; font-weight: 600; color: var(--accent); }

/* Lesson Page Styles */
.lesson-layout { display: flex; max-width: 1400px; margin: 0 auto; width: 100%; min-height: calc(100vh - 73px); }
.lesson-sidebar { width: 290px; background: var(--bg-card); border-right: 1px solid var(--border); padding: 20px 14px; display: flex; flex-direction: column; gap: 14px; position: sticky; top: 60px; height: calc(100vh - 60px); overflow-y: auto; }
.sidebar-title { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 6px; }
.sidebar-menu { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.sidebar-item a { display: flex; align-items: center; gap: 8px; padding: 7px 10px; border-radius: var(--radius-sm); font-size: 12px; color: var(--text-secondary); }
.sidebar-item a:hover { background: var(--bg-panel); color: var(--text-primary); }
.sidebar-item.active a { background: rgba(0, 230, 118, 0.08); border: 1px solid var(--accent-dark); color: var(--accent); font-weight: 600; }
.sidebar-item .num { font-family: 'Orbitron', sans-serif; font-size: 10px; color: var(--text-muted); }
.sidebar-item.active .num { color: var(--accent); }
.sidebar-item.done .num::after { content: ' ✓'; color: var(--accent); }

.lesson-main { flex: 1; padding: 30px 45px 60px; max-width: 960px; }
.breadcrumbs { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-muted); margin-bottom: 18px; }
.breadcrumbs a:hover { color: var(--accent); }
.lesson-header { margin-bottom: 25px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.lesson-module-tag { font-family: 'Orbitron', sans-serif; font-size: 11px; color: var(--accent); font-weight: 700; }
.lesson-time { font-size: 11.5px; color: var(--text-muted); margin-left: 12px; }
.lesson-title { font-size: 28px; line-height: 1.25; margin-bottom: 10px; }
.lesson-lead { font-size: 15.5px; color: var(--text-secondary); line-height: 1.6; }

.lesson-body { font-size: 15px; line-height: 1.8; color: #CBD5E1; }
.lesson-body h2 { font-size: 20px; margin: 30px 0 12px; color: var(--text-primary); border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.lesson-body h3 { font-size: 16.5px; margin: 22px 0 8px; color: var(--accent); }
.lesson-body p { margin-bottom: 16px; }
.lesson-body ul, .lesson-body ol { margin: 0 0 18px 20px; }
.lesson-body li { margin-bottom: 6px; }

.callout { background: var(--bg-panel); border-left: 4px solid var(--accent); padding: 14px 18px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 20px 0; }
.callout.warning { border-left-color: var(--warning); background: rgba(255, 184, 0, 0.05); }
.callout.danger { border-left-color: var(--danger); background: rgba(255, 51, 102, 0.05); }
.callout.success { border-left-color: var(--accent); background: rgba(0, 230, 118, 0.05); }
.callout-title { font-family: 'Orbitron', sans-serif; font-size: 12.5px; font-weight: 700; margin-bottom: 4px; }

.code-block { background: #04070D; border: 1px solid var(--border); border-radius: var(--radius-sm); margin: 20px 0; overflow: hidden; }
.code-header { display: flex; justify-content: space-between; align-items: center; padding: 6px 12px; background: var(--bg-card); border-bottom: 1px solid var(--border); font-size: 11px; color: var(--text-muted); font-family: 'JetBrains Mono', monospace; }
.copy-btn { background: transparent; border: 1px solid var(--border-light); color: var(--text-secondary); padding: 2px 8px; border-radius: 4px; font-size: 10px; cursor: pointer; }
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
pre code { display: block; padding: 14px; overflow-x: auto; font-family: 'JetBrains Mono', monospace; font-size: 12.5px; color: #86EFAC; }

/* Quizzes */
.quiz-container { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 20px; margin: 35px 0 20px; }
.quiz-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.quiz-title { font-size: 15px; }
.quiz-question { font-size: 14.5px; font-weight: 600; margin-bottom: 12px; }
.quiz-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.quiz-option { background: var(--bg-panel); border: 1px solid var(--border); padding: 10px 14px; border-radius: var(--radius-sm); color: var(--text-secondary); cursor: pointer; font-size: 13px; transition: all 0.2s; }
.quiz-option:hover:not(.locked) { border-color: var(--accent); color: var(--text-primary); }
.quiz-option.selected { border-color: var(--accent); background: rgba(0, 230, 118, 0.1); color: var(--text-primary); }
.quiz-option.correct { border-color: var(--accent) !important; background: rgba(0, 230, 118, 0.15) !important; color: var(--accent) !important; font-weight: 700; }
.quiz-option.wrong { border-color: var(--danger) !important; background: rgba(255, 51, 102, 0.15) !important; color: var(--danger) !important; }
.quiz-feedback { display: none; padding: 10px 14px; border-radius: var(--radius-sm); font-size: 13px; margin-bottom: 14px; }
.quiz-feedback.show { display: block; }
.quiz-feedback.success { background: rgba(0, 230, 118, 0.1); border: 1px solid var(--accent); color: var(--accent); }
.quiz-feedback.error { background: rgba(255, 51, 102, 0.1); border: 1px solid var(--danger); color: var(--danger); }
.lesson-nav-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 35px; padding-top: 20px; border-top: 1px solid var(--border); }

/* Spotlight Modal */
.spotlight-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(4, 7, 12, 0.85); backdrop-filter: blur(8px); z-index: 1000; display: none; align-items: flex-start; justify-content: center; padding-top: 100px; }
.spotlight-overlay.open { display: flex; }
.spotlight-modal { width: 90%; max-width: 650px; background: var(--bg-card); border: 1px solid var(--accent-dark); border-radius: var(--radius-md); box-shadow: 0 20px 50px rgba(0, 0, 0, 0.9), 0 0 30px var(--accent-glow); overflow: hidden; }
.spotlight-input-box { display: flex; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border); gap: 12px; }
.spotlight-input-box span { font-size: 18px; color: var(--accent); }
.spotlight-input { width: 100%; background: transparent; border: none; color: var(--text-primary); font-size: 16px; outline: none; }
.spotlight-results { max-height: 380px; overflow-y: auto; padding: 10px; display: flex; flex-direction: column; gap: 4px; }
.spotlight-item { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; border-radius: var(--radius-sm); color: var(--text-secondary); font-size: 13.5px; cursor: pointer; transition: all 0.15s; }
.spotlight-item:hover, .spotlight-item.active { background: rgba(0, 230, 118, 0.12); color: var(--text-primary); border-left: 3px solid var(--accent); }
.spotlight-item .item-type { font-size: 10px; font-family: 'Orbitron', sans-serif; color: var(--accent); background: var(--bg-panel); padding: 2px 6px; border-radius: 3px; border: 1px solid var(--border); }
.spotlight-footer { padding: 10px 16px; background: var(--bg-panel); border-top: 1px solid var(--border); font-size: 11px; color: var(--text-muted); display: flex; justify-content: space-between; }

.prompt-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 20px; margin-bottom: 18px; }
.prompt-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.prompt-header h3 { font-size: 16px; color: var(--accent); }
.prompt-body { background: #04070D; border: 1px solid var(--border); padding: 14px; border-radius: var(--radius-sm); font-size: 13px; color: #CBD5E1; font-family: 'JetBrains Mono', monospace; line-height: 1.6; white-space: pre-wrap; margin-bottom: 12px; }

footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 20px 30px; text-align: center; color: var(--text-muted); font-size: 12px; margin-top: auto; }
@media (max-width: 900px) {
    .header { padding: 10px 14px; flex-wrap: wrap; gap: 10px; }
    .nav { order: 3; width: 100%; overflow-x: auto; }
    .lesson-layout { flex-direction: column; }
    .lesson-sidebar { width: 100%; height: auto; position: static; border-right: none; border-bottom: 1px solid var(--border); }
    .lesson-main { padding: 20px 14px; }
    .hero-title { font-size: 25px; }
    .stats-strip { grid-template-columns: 1fr 1fr; margin-top: 14px; }
    .course-grid { grid-template-columns: 1fr; }
}