@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Outfit:wght@600;700;800&display=swap');
:root { --primary-brand: #2563eb; --primary-glow: rgba(37, 99, 235, 0.35); --bg-dark: #0b0f19; --bg-card: rgba(15, 23, 42, 0.85); --bg-sidebar: rgba(15, 23, 42, 0.95); --border-color: rgba(255, 255, 255, 0.08); --border-accent: rgba(37, 99, 235, 0.3); --text-main: #f8fafc; --text-muted: #94a3b8; --accent-emerald: #10b981; --accent-red: #ef4444; --radius-lg: 16px; --radius-md: 12px; }
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', sans-serif; background: var(--bg-dark); color: var(--text-main); min-height: 100vh; padding-bottom: 3rem; }
.navbar { display: flex; justify-content: space-between; align-items: center; padding: 1rem 2rem; background: var(--bg-sidebar); border-bottom: 1px solid var(--border-color); }
.brand-logo { display: flex; align-items: center; gap: 12px; }
.logo-badge { background: var(--primary-brand); width: 42px; height: 42px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-family: 'Outfit'; font-weight: 800; color: white; box-shadow: 0 4px 15px var(--primary-glow); }
.brand-title { font-family: 'Outfit'; font-size: 1.35rem; }
.brand-subtitle { font-size: 0.75rem; color: var(--accent-emerald); text-transform: uppercase; }
.nav-links { display: flex; gap: 8px; }
.nav-btn { background: transparent; border: none; color: var(--text-muted); padding: 10px 16px; border-radius: 12px; cursor: pointer; font-weight: 500; }
.nav-btn.active { background: rgba(37, 99, 235, 0.15); border: 1px solid var(--border-accent); color: #60a5fa; font-weight: 600; }
.container { max-width: 1280px; margin: 0 auto; padding: 2rem; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.section-header { margin-bottom: 2rem; display: flex; justify-content: space-between; align-items: flex-end; }
.section-title { font-family: 'Outfit'; font-size: 1.85rem; margin-bottom: 0.35rem; }
.section-desc { color: var(--text-muted); }
.builder-layout { display: flex; gap: 1.5rem; min-height: calc(100vh - 200px); }
.builder-sidebar { width: 280px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; padding: 1.25rem; }
.sidebar-title { font-size: 0.8rem; text-transform: uppercase; color: var(--text-muted); margin-bottom: 1rem; }
.block-btn { width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border-color); background: rgba(30, 41, 59, 0.4); color: var(--text-main); font-size: 0.9rem; display: flex; align-items: center; gap: 12px; cursor: pointer; margin-bottom: 0.75rem; }
.block-btn.video { background: rgba(37, 99, 235, 0.12); color: #60a5fa; }
.block-btn.quiz { background: rgba(139, 92, 246, 0.12); color: #c084fc; }
.block-btn.score { background: rgba(245, 158, 11, 0.12); color: #fbbf24; }
.block-btn.cert { background: rgba(16, 185, 129, 0.12); color: #34d399; }
.builder-canvas { flex-grow: 1; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; padding: 2rem; }
.course-title-input { font-family: 'Outfit'; font-size: 1.8rem; background: transparent; border: none; border-bottom: 2px solid var(--border-color); color: var(--text-main); width: 100%; padding-bottom: 0.5rem; margin-bottom: 1.5rem; outline: none; }
.canvas-block-item { background: rgba(30, 41, 59, 0.6); border: 1px solid var(--border-color); border-radius: 12px; padding: 1.25rem; margin-bottom: 1rem; }
.block-header { display: flex; justify-content: space-between; align-items: center; }
.block-drag-handle { display: flex; align-items: center; gap: 10px; }
.block-badge { font-size: 0.75rem; font-weight: 700; padding: 4px 10px; border-radius: 12px; text-transform: uppercase; }
.badge-video { background: rgba(37, 99, 235, 0.2); color: #60a5fa; }
.badge-quiz { background: rgba(139, 92, 246, 0.2); color: #c084fc; }
.badge-score { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }
.badge-cert { background: rgba(16, 185, 129, 0.2); color: #34d399; }
.player-container { display: grid; grid-template-columns: 1fr 340px; gap: 1.5rem; }
.player-main, .player-sidebar { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; padding: 2rem; }
.video-frame { width: 100%; height: 400px; border-radius: 12px; background: #000; overflow: hidden; margin-bottom: 1.5rem; }
.quiz-option { background: rgba(30, 41, 59, 0.5); border: 1px solid var(--border-color); border-radius: 12px; padding: 14px 18px; margin-bottom: 0.75rem; cursor: pointer; display: flex; align-items: center; gap: 12px; }
.certificate-preview-box { background: linear-gradient(135deg, #ffffff, #f1f5f9); color: #0f172a; border-radius: 12px; padding: 2.5rem; text-align: center; border: 8px double var(--primary-brand); box-shadow: 0 10px 30px rgba(0,0,0,0.3); margin-top: 1.5rem; }
.cert-title { font-family: 'Outfit'; font-size: 2rem; font-weight: 800; color: var(--primary-brand); margin-bottom: 0.5rem; }
.cert-name { font-size: 1.5rem; font-weight: 700; margin: 1.5rem 0 0.5rem 0; border-bottom: 2px solid #cbd5e1; display: inline-block; padding-bottom: 0.25rem; }
.form-group { margin-bottom: 1.25rem; }
.form-label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--text-muted); margin-bottom: 0.5rem; }
.form-input, .form-select, .form-textarea { width: 100%; background: rgba(15, 23, 42, 0.6); border: 1px solid var(--border-color); border-radius: 12px; padding: 12px 16px; color: var(--text-main); font-size: 0.95rem; }
.btn { background: var(--primary-brand); color: white; border: none; padding: 12px 24px; border-radius: 12px; font-weight: 600; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
.btn-emerald { background: var(--accent-emerald); }
.btn-secondary { background: rgba(255, 255, 255, 0.08); border: 1px solid var(--border-color); color: var(--text-main); }
.btn-red { background: rgba(239, 68, 68, 0.15); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.3); }
.btn-block { width: 100%; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; margin-bottom: 2.5rem; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border-color); padding: 1.5rem; border-radius: 16px; display: flex; align-items: center; gap: 1.25rem; }
.stat-icon { width: 52px; height: 52px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }
.icon-blue { background: rgba(37, 99, 235, 0.15); color: #60a5fa; }
.icon-purple { background: rgba(139, 92, 246, 0.15); color: #c084fc; }
.icon-emerald { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.icon-amber { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.stat-val { font-family: 'Outfit'; font-size: 1.8rem; font-weight: 800; }
.stat-lbl { font-size: 0.85rem; color: var(--text-muted); }
.toast-container { position: fixed; bottom: 2rem; right: 2rem; z-index: 1000; }
.toast { background: var(--bg-card); border: 1px solid var(--accent-emerald); color: var(--text-main); padding: 1rem 1.5rem; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); display: flex; align-items: center; gap: 12px; }