/* ===================================
   Course Landing Page Styles
   JavaScript & Node.js Course
   =================================== */

/* === Landing-page variables (not in global CSS) === */
:root {
    --radius: 14px;
    --radius-sm: 8px;
    --accent-js: #f7df1e;
}

[data-theme="light"] {
    --accent-js: #c9a90c;
}

/* === Hero Section === */
.course-hero {
    padding: 6rem 0 4rem;
    text-align: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    margin-top: 70px;
}

[data-theme="light"] .course-hero {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-text {
    max-width: 720px;
    margin: 0 auto;
}

.course-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin: 0 0 1rem;
    color: var(--text-primary);
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.course-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0 0 1.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.course-description {
    font-size: 1rem;
    color: var(--text-tertiary);
    line-height: 1.7;
    margin: 0 0 2rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(122, 162, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(122, 162, 255, 0.4);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.course-meta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    color: var(--text-tertiary);
}

.meta-item svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

/* === Generic Section Layout === */
.section {
    padding: 4rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.75rem;
}

.section-icon {
    font-size: 1.5rem;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-tertiary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* === Learning Path Flow === */
.course-flow {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    margin-top: 2rem;
    text-align: center;
}

.flow-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 1.25rem;
}

.flow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.flow-step {
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.flow-arrow {
    color: var(--accent-primary);
    font-size: 1.2rem;
    font-weight: 700;
}

/* === Learning Pillars === */
.learning-pillars {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.pillar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.75rem;
    transition: all 0.3s;
}

.pillar-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.pillar-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 16px;
    margin-bottom: 1rem;
}

.pillar-js .pillar-icon {
    background: rgba(247, 223, 30, 0.1);
    color: var(--accent-js);
}
.pillar-node .pillar-icon {
    background: rgba(110, 231, 183, 0.1);
    color: var(--accent-secondary);
}
.pillar-fullstack .pillar-icon {
    background: rgba(122, 162, 255, 0.1);
    color: var(--accent-primary);
}

.pillar-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.75rem;
}

.pillar-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.pillar-list li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.pillar-list li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 700;
}

/* === Module Cards Grid === */
.modules-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.module-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.module-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.75rem;
    transition: all 0.3s;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.module-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.module-card-available {
    cursor: pointer;
}

.module-card-available:hover {
    border-color: var(--accent-primary);
}

.module-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.module-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-tertiary);
    opacity: 0.5;
}

.module-badge {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0.6rem;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.module-badge-js {
    background: rgba(247, 223, 30, 0.15);
    color: var(--accent-js);
}

.module-badge-browser {
    background: rgba(122, 162, 255, 0.15);
    color: var(--accent-primary);
}

.module-badge-node {
    background: rgba(110, 231, 183, 0.15);
    color: var(--accent-secondary);
}

.module-badge-security {
    background: rgba(248, 113, 113, 0.15);
    color: #f87171;
}

.module-badge-http {
    background: rgba(216, 123, 255, 0.15);
    color: var(--accent-secondary);
}

.module-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.5rem;
}

.module-description {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0 0 1rem;
    flex: 1;
}

.module-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1rem;
}

.topic {
    padding: 0.2rem 0.6rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 0.72rem;
    color: var(--text-tertiary);
    white-space: nowrap;
}

.module-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.module-time {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.module-status {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.15rem 0.5rem;
    border-radius: 100px;
}

.module-status-available {
    background: rgba(110, 231, 183, 0.15);
    color: var(--accent-secondary);
}

.module-status-soon {
    background: var(--bg-tertiary);
    color: var(--text-tertiary);
}

/* === Prerequisites === */
.prereq-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    max-width: 700px;
    margin: 0 auto;
}

.prereq-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem;
}

.prereq-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.prereq-list li svg {
    color: var(--accent-secondary);
    flex-shrink: 0;
    margin-top: 0.15rem;
}

.playground-cta {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: rgba(122, 162, 255, 0.06);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.playground-cta svg {
    color: var(--accent-primary);
    flex-shrink: 0;
    margin-top: 0.15rem;
}

.playground-cta p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.playground-cta a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
}

.playground-cta a:hover {
    text-decoration: underline;
}

/* === Tools Grid === */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.75rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
}

.tool-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.tool-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: rgba(122, 162, 255, 0.1);
    border-radius: 14px;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.tool-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.5rem;
}

.tool-description {
    color: var(--text-tertiary);
    font-size: 0.88rem;
    line-height: 1.5;
    margin: 0 0 1rem;
}

.tool-cta {
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.88rem;
}

/* === What's Next Section === */
.next-courses {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 700px;
    margin: 0 auto;
}

.next-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
}

.next-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.next-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.next-info h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.3rem;
}

.next-info p {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    line-height: 1.4;
    margin: 0;
}

.next-arrow {
    font-size: 1.5rem;
    color: var(--accent-primary);
    margin-left: auto;
    flex-shrink: 0;
}

/* === Footer === */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: flex;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand {
    flex: 1;
}

.footer-logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.3rem;
}

.footer-tagline {
    color: var(--text-tertiary);
    font-size: 0.88rem;
    margin: 0 0 0.3rem;
}

.footer-course-subtitle {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    margin: 0;
    opacity: 0.7;
}

.footer-links {
    display: flex;
    gap: 3rem;
}

.footer-column h4 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    margin: 0 0 0.75rem;
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column li {
    margin-bottom: 0.4rem;
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.88rem;
    transition: color 0.2s;
}

.footer-column a:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1.25rem;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-tertiary);
    font-size: 0.82rem;
    margin: 0 0 0.25rem;
}

.footer-credit {
    opacity: 0.7;
}

/* === Container === */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* === Fixed Controls === */
.fixed-controls {
    position: fixed;
    top: 50%;
    right: 1rem;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 200;
}

.language-toggle-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.language-toggle-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
}

.lang-flag svg {
    display: block;
}

/* === Responsive === */
@media (max-width: 768px) {
    .course-hero {
        padding: 4rem 0 3rem;
    }

    .course-title {
        font-size: 2rem;
    }

    .course-meta {
        gap: 1rem;
    }

    .modules-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 2rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 2.5rem 0;
    }

    .learning-pillars {
        grid-template-columns: 1fr;
    }
}

@media print {
    .fixed-controls,
    .navbar,
    .course-hero,
    .footer {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}