@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --color-csharp: #2563eb;
    --color-csharp-glow: rgba(37, 99, 235, 0.15);
    
    --color-visual: #8b5cf6;
    --color-visual-glow: rgba(139, 92, 246, 0.15);
    
    --color-2d: #10b981;
    --color-2d-glow: rgba(16, 185, 129, 0.15);
    
    --color-3d: #ef4444;
    --color-3d-glow: rgba(239, 68, 68, 0.15);
    
    --color-qa: #f59e0b;
    --color-qa-glow: rgba(245, 158, 11, 0.15);
    
    --color-pm: #6366f1;
    --color-pm-glow: rgba(99, 102, 241, 0.15);

    --primary-grad: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --glow-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
header {
    background: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1.2rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--primary-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 2rem;
    font-weight: 500;
    transition: color 0.3s;
}

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

.nav-btn {
    background: var(--primary-grad);
    color: white !important;
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    font-size: 0.9rem;
    box-shadow: var(--glow-shadow);
}

/* Hero Section */
.hero {
    padding: 6rem 0 4rem;
    text-align: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: -10%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(0,0,0,0) 70%);
    z-index: -1;
    pointer-events: none;
}

.hero-tag {
    display: inline-block;
    background: rgba(99, 102, 241, 0.1);
    color: #818cf8;
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff 40%, #c7d2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.btn-primary {
    background: var(--primary-grad);
    color: white;
    box-shadow: var(--glow-shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Stats Section */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin: 3rem 0 6rem;
}

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-family: 'Outfit', sans-serif;
    background: var(--primary-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

/* Section Common Styling */
.section-title-wrap {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(to right, #ffffff, #9ca3af);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Interactive Roadmap Section */
.roadmap-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3rem;
    margin-bottom: 6rem;
    position: relative;
    overflow: hidden;
}

.roadmap-svg-wrapper {
    position: relative;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    overflow-x: auto;
}

.roadmap-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.roadmap-branch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    width: 100%;
    position: relative;
}

/* Sub-branch for 2D vs 3D */
.roadmap-sub-branch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    width: 100%;
}

.roadmap-node {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    border-radius: 12px;
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s;
    position: relative;
    display: block;
    z-index: 2;
}

.roadmap-node::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 12px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s;
}

.roadmap-node:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.4);
    border-color: currentColor;
}

.roadmap-node.track-none { color: var(--color-visual); }
.roadmap-node.track-none::before { background: var(--color-visual-glow); }

.roadmap-node.track-csharp { color: var(--color-csharp); }
.roadmap-node.track-csharp::before { background: var(--color-csharp-glow); }

.roadmap-node.track-2d { color: var(--color-2d); }
.roadmap-node.track-2d::before { background: var(--color-2d-glow); }

.roadmap-node.track-3d { color: var(--color-3d); }
.roadmap-node.track-3d::before { background: var(--color-3d-glow); }

.roadmap-node.track-qa { color: var(--color-qa); }
.roadmap-node.track-qa::before { background: var(--color-qa-glow); }

.roadmap-node.track-pm { color: var(--color-pm); }
.roadmap-node.track-pm::before { background: var(--color-pm-glow); }

.roadmap-node:hover::before {
    opacity: 1;
}

.node-number {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.25rem;
    opacity: 0.8;
}

.node-title {
    font-size: 1.1rem;
    font-weight: 600;
}

/* Course Grid Section */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 6rem;
}

.course-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--text-muted);
}

.course-card.card-csharp::before { background: var(--color-csharp); }
.course-card.card-visual::before { background: var(--color-visual); }
.course-card.card-2d::before { background: var(--color-2d); }
.course-card.card-3d::before { background: var(--color-3d); }
.course-card.card-qa::before { background: var(--color-qa); }
.course-card.card-pm::before { background: var(--color-pm); }

.course-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.course-badge-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.course-number {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
}

.course-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-csharp { background: rgba(37, 99, 235, 0.1); color: var(--color-csharp); }
.badge-visual { background: rgba(139, 92, 246, 0.1); color: var(--color-visual); }
.badge-2d { background: rgba(16, 185, 129, 0.1); color: var(--color-2d); }
.badge-3d { background: rgba(239, 68, 68, 0.1); color: var(--color-3d); }
.badge-qa { background: rgba(245, 158, 11, 0.1); color: var(--color-qa); }
.badge-pm { background: rgba(99, 102, 241, 0.1); color: var(--color-pm); }

.course-card h3 {
    font-size: 1.35rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.course-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    margin-bottom: 1.5rem;
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.course-card .btn {
    text-align: center;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
}

/* Detail Page Custom CSS */
.detail-hero {
    padding: 5rem 0 3rem;
    position: relative;
    overflow: hidden;
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    margin-bottom: 2rem;
    transition: color 0.3s;
}

.back-link:hover {
    color: var(--text-primary);
}

.detail-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 6rem;
}

.detail-content section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: 20px;
    margin-bottom: 2rem;
}

.detail-content h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--text-muted);
    padding-left: 1rem;
}

.detail-content h2.csharp-accent { border-color: var(--color-csharp); }
.detail-content h2.visual-accent { border-color: var(--color-visual); }
.detail-content h2.accent-2d { border-color: var(--color-2d); }
.detail-content h2.accent-3d { border-color: var(--color-3d); }
.detail-content h2.qa-accent { border-color: var(--color-qa); }
.detail-content h2.pm-accent { border-color: var(--color-pm); }

/* Quick Info Sidebar Card */
.sidebar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    position: sticky;
    top: 6rem;
}

.sidebar-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.info-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    font-size: 0.95rem;
}

.info-label {
    color: var(--text-secondary);
}

.info-value {
    font-weight: 600;
}

.sidebar-card .btn {
    width: 100%;
    text-align: center;
    margin-top: 1.5rem;
}

/* Accordion Curriculum style */
.accordion {
    margin-top: 1rem;
}

.accordion-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.accordion-header {
    background: rgba(255, 255, 255, 0.02);
    padding: 1.2rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    transition: background 0.3s;
}

.accordion-header:hover {
    background: rgba(255, 255, 255, 0.04);
}

.accordion-title {
    font-weight: 600;
    font-size: 1.05rem;
}

.accordion-icon {
    font-size: 0.8rem;
    transition: transform 0.3s;
}

.accordion-content {
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease;
    background: rgba(11, 15, 25, 0.3);
}

.accordion-item.active .accordion-content {
    padding: 1.5rem;
    max-height: 1000px;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.syllabus-list {
    list-style: none;
}

.syllabus-list li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.syllabus-list li::before {
    content: '•';
    color: var(--text-muted);
    position: absolute;
    left: 0.5rem;
}

/* Grid layout for Outcomes / Audiences */
.icon-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.icon-card {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.icon-box {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.75rem;
    border-radius: 8px;
    flex-shrink: 0;
}

.icon-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.icon-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Call to action */
.cta-section {
    padding: 5rem 0;
    text-align: center;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, rgba(0,0,0,0) 70%);
}

.cta-box {
    background: linear-gradient(135deg, rgba(31, 41, 55, 0.6) 0%, rgba(17, 24, 39, 0.8) 100%);
    border: 1px solid var(--border-color);
    padding: 4rem 2rem;
    border-radius: 24px;
    max-width: 800px;
    margin: 0 auto;
}

.cta-box h2 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.cta-box p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .detail-grid {
        grid-template-columns: 1fr;
    }
    .sidebar-card {
        position: static;
    }
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    .courses-grid {
        grid-template-columns: 1fr;
    }
    .roadmap-branch {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .roadmap-sub-branch {
        grid-template-columns: 1fr;
    }
    .icon-grid {
        grid-template-columns: 1fr;
    }
}

/* Custom SVG Diagram Styles */
.roadmap-svg {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto;
}

.roadmap-svg-line {
    fill: none;
    stroke: var(--text-muted);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    opacity: 0.5;
}

.roadmap-svg-line.active {
    stroke: var(--color-pm);
    opacity: 1;
}

.footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}