/* ===== Course Landing Page Styles ===== */

    /* Hero Banner */
    .course-hero-banner {
        background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%);
        padding: 50px 0 55px; color: #fff; position: relative; overflow: hidden;
    }
    .course-hero-banner::before {
        content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px;
        background: radial-gradient(circle, rgba(79,70,229,0.15), transparent 70%);
        border-radius: 50%;
    }
    .course-hero-banner .breadcrumb-nav ul { padding: 0; margin: 0 0 20px; list-style: none; }
    .course-hero-banner .breadcrumb-nav ul li { display: inline-block; color: rgba(255,255,255,0.7); font-size: 14px; }
    .course-hero-banner .breadcrumb-nav ul li a { color: rgba(255,255,255,0.85); text-decoration: none; }
    .course-hero-banner .breadcrumb-nav ul li a:hover { color: #fff; }
    .course-hero-banner .breadcrumb-nav ul li + li::before { content: "›"; margin: 0 8px; color: rgba(255,255,255,0.5); }
    .course-hero-banner .breadcrumb-nav ul li.active { color: #fff; }

    .hero-badges { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 15px; }
    .hero-badge-category { font-size: 11px; font-weight: 600; padding: 4px 12px; border-radius: 20px; background: rgba(79,70,229,0.3); color: #a5b4fc; text-transform: uppercase; letter-spacing: 0.5px; }
    .hero-badge-level { font-size: 11px; font-weight: 600; padding: 4px 12px; border-radius: 20px; }
    .hero-badge-level.beginner { background: rgba(34,197,94,0.2); color: #86efac; }
    .hero-badge-level.intermediate { background: rgba(245,158,11,0.2); color: #fcd34d; }
    .hero-badge-level.advanced { background: rgba(239,68,68,0.2); color: #fca5a5; }
    .hero-badge-updated { font-size: 12px; color: rgba(255,255,255,0.6); }
    .hero-badge-updated i { margin-right: 4px; }

    .course-hero-content h1 { font-size: 34px; font-weight: 800; margin-bottom: 14px; line-height: 1.3; color: #fff; }
    .hero-subtitle { font-size: 16px; line-height: 1.7; opacity: 0.85; margin-bottom: 25px; color: #fff; }

    .hero-stats-row { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 25px; }
    .hero-stat { font-size: 14px; color: rgba(255,255,255,0.75); }
    .hero-stat i { margin-right: 5px; color: #FFD43B; }
    .hero-stat strong { color: #fff; }

    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
    .btn-start-learning {
        display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px;
        background: #4f46e5; color: #fff; border-radius: 8px; font-weight: 700;
        font-size: 15px; text-decoration: none; transition: all 0.2s;
    }
    .btn-start-learning:hover { background: #4338ca; transform: translateY(-2px); color: #fff; text-decoration: none; }
    .btn-practice {
        display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px;
        background: rgba(255,255,255,0.1); color: #fff; border-radius: 8px;
        font-weight: 600; font-size: 15px; text-decoration: none; border: 1px solid rgba(255,255,255,0.2);
        transition: all 0.2s;
    }
    .btn-practice:hover { background: rgba(255,255,255,0.2); color: #fff; text-decoration: none; }

    /* Hero Visual Card */
    .hero-visual-card {
        background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
        border-radius: 16px; padding: 40px 30px; text-align: center; backdrop-filter: blur(10px);
    }
    .hero-icon-large { font-size: 80px; color: #FFD43B; margin-bottom: 25px; }
    .hero-visual-stats { display: flex; justify-content: center; gap: 25px; }
    .visual-stat-item { text-align: center; }
    .visual-stat-circle {
        width: 70px; height: 70px; border-radius: 50%;
        background: rgba(79,70,229,0.2); border: 3px solid #4f46e5;
        display: flex; align-items: center; justify-content: center; margin: 0 auto 8px;
    }
    .visual-stat-circle span { font-size: 14px; font-weight: 700; color: #fff; }
    .visual-stat-item p { font-size: 12px; color: rgba(255,255,255,0.6); margin: 0; }

    /* Highlights Section */
    .course-highlights-section { padding: 40px 0; background: #f8fafc; }
    .highlights-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .highlight-card {
        background: #fff; border-radius: 10px; padding: 25px; box-shadow: 0 2px 10px rgba(0,0,0,0.06);
        border: 1px solid #e2e8f0;
    }
    .highlight-icon { font-size: 28px; color: #4f46e5; margin-bottom: 12px; }
    .highlight-card h4 { font-size: 17px; font-weight: 700; color: #1e293b; margin-bottom: 12px; }
    .highlight-card ul { padding-left: 18px; margin: 0; }
    .highlight-card ul li { font-size: 14px; color: #64748b; line-height: 1.8; }

    /* Chapter Section */
    .course-chapters-section { padding: 50px 0; background: #fff; }
    .section-title-center { text-align: center; margin-bottom: 35px; }
    .section-title-center h2 { font-size: 26px; font-weight: 700; color: #1e293b; margin-bottom: 8px; }
    .section-title-center p { font-size: 15px; color: #64748b; }

    /* Chapter Cards */
    .chapter-card {
        background: #fff; border: 1px solid #e2e8f0; border-radius: 10px;
        margin-bottom: 12px; overflow: hidden; cursor: pointer; transition: all 0.2s;
    }
    .chapter-card:hover { border-color: #4f46e5; box-shadow: 0 4px 15px rgba(79,70,229,0.1); }
    .chapter-header {
        display: flex; align-items: center; gap: 15px; padding: 18px 22px;
    }
    .chapter-number {
        width: 42px; height: 42px; border-radius: 10px; display: flex; align-items: center;
        justify-content: center; font-size: 16px; font-weight: 800; color: #4f46e5;
        background: #eef2ff; flex-shrink: 0;
    }
    .chapter-info { flex: 1; }
    .chapter-info h3 { font-size: 16px; font-weight: 600; color: #1e293b; margin: 0 0 5px; border: none; padding: 0; }
    .chapter-meta { display: flex; gap: 12px; flex-wrap: wrap; }
    .chapter-meta span { font-size: 12px; color: #94a3b8; }
    .chapter-meta span i { margin-right: 3px; }
    .chapter-level { font-size: 11px !important; font-weight: 600; padding: 2px 8px; border-radius: 10px; }
    .chapter-level.beginner { background: #dcfce7; color: #166534; }
    .chapter-level.intermediate { background: #fef3c7; color: #92400e; }
    .chapter-level.advanced { background: #fee2e2; color: #991b1b; }
    .chapter-toggle { color: #94a3b8; transition: transform 0.3s; }
    .chapter-card.active .chapter-toggle { transform: rotate(180deg); }

    .chapter-body {
        display: none; padding: 0 22px 18px; border-top: 1px solid #f1f5f9;
    }
    .chapter-card.active .chapter-body { display: block; }

    .lesson-list { list-style: none; padding: 0; margin: 12px 0 0; }
    .lesson-list li {
        display: flex; align-items: center; gap: 10px; padding: 10px 12px;
        border-radius: 6px; transition: background 0.2s;
    }
    .lesson-list li:hover { background: #f8fafc; }
    .lesson-icon { color: #4f46e5; font-size: 14px; flex-shrink: 0; }
    .lesson-list li a { flex: 1; font-size: 14px; color: #334155; text-decoration: none; }
    .lesson-list li a:hover { color: #4f46e5; }
    .lesson-duration { font-size: 12px; color: #94a3b8; white-space: nowrap; }

    /* Sidebar */
    .course-sidebar-sticky { position: sticky; top: 80px; }
    .course-progress-card, .course-quick-links, .course-related-card, .course-cta-card {
        background: #fff; border-radius: 10px; padding: 22px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.06); margin-bottom: 18px;
        border: 1px solid #e2e8f0;
    }
    .course-progress-card h5, .course-quick-links h5, .course-related-card h5, .course-cta-card h5 {
        font-size: 16px; font-weight: 700; color: #1e293b; margin-bottom: 15px;
    }
    .progress-circle-wrap { text-align: center; margin-bottom: 15px; }
    .progress-circle-big {
        width: 80px; height: 80px; border-radius: 50%;
        background: #f1f5f9; border: 4px solid #e2e8f0;
        display: flex; align-items: center; justify-content: center;
        margin: 0 auto 8px; font-size: 20px; font-weight: 800; color: #94a3b8;
    }
    .progress-circle-wrap p { font-size: 13px; color: #94a3b8; margin: 0; }
    .progress-stats { display: flex; justify-content: center; gap: 25px; margin-bottom: 15px; }
    .pstat { text-align: center; }
    .pstat span { font-size: 16px; font-weight: 700; color: #1e293b; display: block; }
    .pstat small { font-size: 12px; color: #94a3b8; }
    .btn-continue-learning {
        display: block; text-align: center; padding: 10px; background: #4f46e5;
        color: #fff; border-radius: 8px; font-weight: 600; font-size: 14px;
        text-decoration: none; transition: background 0.2s;
    }
    .btn-continue-learning:hover { background: #4338ca; color: #fff; text-decoration: none; }

    .course-quick-links a {
        display: flex; align-items: center; gap: 10px; padding: 9px 12px;
        font-size: 14px; color: #475569; text-decoration: none; border-radius: 6px;
        transition: all 0.2s;
    }
    .course-quick-links a:hover { background: #f0f4ff; color: #4f46e5; padding-left: 16px; }
    .course-quick-links a i { width: 18px; color: #4f46e5; }

    .related-item {
        display: flex; align-items: center; gap: 12px; padding: 10px;
        text-decoration: none; border-radius: 8px; transition: background 0.2s;
        margin-bottom: 6px;
    }
    .related-item:hover { background: #f8fafc; text-decoration: none; }
    .related-item i { font-size: 22px; color: #4f46e5; width: 30px; text-align: center; }
    .related-item strong { font-size: 14px; color: #1e293b; display: block; }
    .related-item small { font-size: 12px; color: #94a3b8; }

    .course-cta-card { background: linear-gradient(135deg, #4f46e5, #7c3aed); color: #fff; border: none; }
    .course-cta-card h5 { color: #fff; }
    .course-cta-card p { font-size: 13px; opacity: 0.9; color: #fff; }
    .cta-enroll-btn {
        display: inline-block; background: #fff; color: #4f46e5; padding: 9px 25px;
        border-radius: 6px; font-weight: 700; font-size: 14px; text-decoration: none;
        transition: all 0.2s;
    }
    .cta-enroll-btn:hover { background: #f0f0ff; transform: translateY(-2px); color: #4f46e5; text-decoration: none; }

    /* Interview Section */
    .course-interview-section { padding: 50px 0; background: #f8fafc; }
    .interview-level-card {
        background: #fff; border-radius: 10px; padding: 25px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.06); height: 100%;
        border-top: 4px solid transparent;
    }
    .interview-level-card.easy { border-top-color: #22c55e; }
    .interview-level-card.medium { border-top-color: #f59e0b; }
    .interview-level-card.hard { border-top-color: #ef4444; }
    .ilc-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
    .ilc-badge { font-size: 12px; font-weight: 700; padding: 3px 12px; border-radius: 15px; }
    .easy .ilc-badge { background: #dcfce7; color: #166534; }
    .medium .ilc-badge { background: #fef3c7; color: #92400e; }
    .hard .ilc-badge { background: #fee2e2; color: #991b1b; }
    .ilc-count { font-size: 13px; color: #94a3b8; }
    .interview-level-card h4 { font-size: 16px; font-weight: 600; color: #1e293b; margin-bottom: 12px; }
    .interview-level-card ul { padding-left: 18px; margin-bottom: 15px; }
    .interview-level-card ul li { font-size: 14px; color: #64748b; line-height: 1.8; }
    .ilc-link { font-size: 14px; font-weight: 600; color: #4f46e5; text-decoration: none; }
    .ilc-link:hover { text-decoration: underline; }
    
    
    .chapter-card.active .chapter-body { display:block; }
    .chapter-body { display:none; }


    /* Responsive */
    @media (max-width: 992px) {
        .highlights-grid { grid-template-columns: 1fr; }
        .course-sidebar-sticky { position: static; }
    }
    @media (max-width: 768px) {
        .course-hero-content h1 { font-size: 24px; }
        .hero-stats-row { gap: 10px; }
        .hero-actions { flex-direction: column; }
        .hero-visual-card { margin-top: 25px; }
    }