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

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

body {
    font-family: 'Sarabun', sans-serif;
    background: #f8f6f1;
    color: #2d3436;
    line-height: 1.7;
    min-height: 100vh;
}

.grain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    z-index: 1000;
}

/* Topbar */
.topbar {
    background: #1a1a2e;
    padding: 12px 0;
}

.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    letter-spacing: 2px;
    text-transform: uppercase;
    text-decoration: none;
}

.topbar-nav {
    display: flex;
    gap: 32px;
}

.topbar-nav a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: color 0.2s;
}

.topbar-nav a:hover,
.topbar-nav a.active {
    color: #fff;
}

/* Hero Section (Index) */
.hero {
    padding: 120px 32px 80px;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-label {
    display: inline-block;
    background: #1a1a2e;
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 8px 16px;
    margin-bottom: 32px;
}

.hero h1 {
    font-size: clamp(42px, 6vw, 72px);
    font-weight: 700;
    color: #1a1a2e;
    line-height: 1.1;
    margin-bottom: 24px;
    max-width: 700px;
}

.hero p {
    font-size: 18px;
    color: #636e72;
    max-width: 520px;
    line-height: 1.8;
}

/* Divider */
.divider {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
}

.divider-line {
    height: 1px;
    background: #ddd;
}

/* Chapters Section */
.chapters-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 32px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 48px;
}

.section-title {
    font-size: 14px;
    font-weight: 600;
    color: #1a1a2e;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.section-count {
    font-size: 13px;
    color: #999;
}

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.chapter-card {
    background: #fff;
    border: 1px solid #e5e5e5;
    padding: 40px;
    text-decoration: none;
    color: inherit;
    position: relative;
    transition: all 0.3s ease;
    display: block;
}

.chapter-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: #1a1a2e;
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.chapter-card:hover {
    border-color: #1a1a2e;
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.chapter-card:hover::before {
    transform: scaleY(1);
}

.chapter-num {
    font-size: 64px;
    font-weight: 700;
    color: #f0ede8;
    line-height: 1;
    margin-bottom: 24px;
}

.chapter-card:hover .chapter-num {
    color: #e8e4dc;
}

.chapter-title {
    font-size: 22px;
    font-weight: 600;
    color: #1a1a2e;
    margin-bottom: 12px;
}

.chapter-desc {
    font-size: 15px;
    color: #777;
    line-height: 1.7;
    margin-bottom: 24px;
}

.chapter-meta {
    display: flex;
    gap: 24px;
    font-size: 12px;
    color: #999;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-wrap: wrap;
}

.chapter-card.featured {
    grid-column: span 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    background: #1a1a2e;
    border-color: #1a1a2e;
}

.chapter-card.featured::before {
    display: none;
}

.chapter-card.featured .chapter-num {
    color: rgba(255, 255, 255, 0.1);
    font-size: 120px;
}

.chapter-card.featured .chapter-title {
    color: #fff;
}

.chapter-card.featured .chapter-desc {
    color: rgba(255, 255, 255, 0.6);
}

.chapter-card.featured .chapter-meta {
    color: rgba(255, 255, 255, 0.4);
}

.chapter-card.featured:hover {
    transform: translateY(-4px);
    box-shadow: 0 30px 60px rgba(26, 26, 46, 0.3);
}

.featured-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.visual-pattern {
    width: 200px;
    height: 200px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.visual-pattern-inner {
    width: 120px;
    height: 120px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
}

.arrow-icon {
    display: inline-block;
    margin-left: 8px;
    transition: transform 0.2s;
}

.chapter-card:hover .arrow-icon {
    transform: translateX(4px);
}

/* Breadcrumb */
.breadcrumb {
    max-width: 900px;
    margin: 0 auto;
    padding: 32px 32px 0;
    font-size: 13px;
    color: #999;
}

.breadcrumb a {
    color: #1a1a2e;
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Chapter Header */
.chapter-header {
    max-width: 900px;
    margin: 0 auto;
    padding: 48px 32px;
    border-bottom: 1px solid #e5e5e5;
}

.chapter-label {
    font-size: 12px;
    font-weight: 600;
    color: #999;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.chapter-header h1 {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    color: #1a1a2e;
    line-height: 1.2;
    margin-bottom: 16px;
}

.chapter-header p {
    font-size: 18px;
    color: #777;
    max-width: 600px;
}

/* Content Layout */
.content-wrapper {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 64px;
    max-width: 900px;
    margin: 0 auto;
    padding: 64px 32px;
}

.sidebar {
    position: sticky;
    top: 32px;
    height: fit-content;
}

.sidebar-title {
    font-size: 11px;
    font-weight: 600;
    color: #999;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav li {
    margin-bottom: 8px;
}

.sidebar-nav a {
    display: block;
    font-size: 14px;
    color: #777;
    text-decoration: none;
    padding: 8px 0;
    border-left: 2px solid transparent;
    padding-left: 16px;
    transition: all 0.2s;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    color: #1a1a2e;
    border-left-color: #1a1a2e;
}

/* Content */
.content {
    min-width: 0;
}

.content h2 {
    font-size: 24px;
    font-weight: 600;
    color: #1a1a2e;
    margin: 48px 0 24px;
    padding-top: 24px;
}

.content h2:first-child {
    margin-top: 0;
    padding-top: 0;
}

.content p {
    font-size: 16px;
    color: #555;
    line-height: 1.9;
    margin-bottom: 20px;
}

.content ul,
.content ol {
    margin: 20px 0 28px 24px;
    color: #555;
}

.content li {
    margin-bottom: 12px;
    font-size: 16px;
    line-height: 1.8;
}

.content img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
    border-radius: 4px;
}

/* Callout */
.callout {
    background: #fff;
    border: 1px solid #e5e5e5;
    border-left: 4px solid #1a1a2e;
    padding: 24px 28px;
    margin: 32px 0;
}

.callout-title {
    font-size: 14px;
    font-weight: 600;
    color: #1a1a2e;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.callout p {
    margin: 0;
    font-size: 15px;
}

.callout.case-study {
    background: #1a1a2e;
    border: none;
}

.callout.case-study .callout-title {
    color: rgba(255, 255, 255, 0.6);
}

.callout.case-study p {
    color: rgba(255, 255, 255, 0.9);
}

/* Files Section */
.files-section {
    background: #fff;
    border: 1px solid #e5e5e5;
    padding: 32px;
    margin: 48px 0;
}

.files-title {
    font-size: 14px;
    font-weight: 600;
    color: #1a1a2e;
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.files-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: #f8f6f1;
    text-decoration: none;
    color: #1a1a2e;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.file-item:hover {
    border-color: #1a1a2e;
    background: #fff;
}

.file-icon {
    width: 40px;
    height: 40px;
    background: #1a1a2e;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.file-info {
    min-width: 0;
}

.file-name {
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-type {
    font-size: 12px;
    color: #999;
    font-weight: 400;
}

/* Navigation Bottom */
.nav-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 32px 0;
    margin-top: 48px;
    border-top: 1px solid #e5e5e5;
}

.nav-link {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    padding: 16px 24px;
    border: 1px solid #e5e5e5;
    transition: all 0.2s;
    max-width: 280px;
}

.nav-link:hover {
    border-color: #1a1a2e;
    background: #fff;
}

.nav-link-label {
    font-size: 12px;
    color: #999;
    margin-bottom: 4px;
}

.nav-link-title {
    font-size: 15px;
    font-weight: 600;
    color: #1a1a2e;
}

/* About Page */
.about-section {
    max-width: 900px;
    margin: 0 auto;
    padding: 64px 32px;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-top: 48px;
}

.about-card {
    background: #fff;
    border: 1px solid #e5e5e5;
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
}

.about-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.about-avatar {
    width: 100px;
    height: 100px;
    background: #1a1a2e;
    border-radius: 50%;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: #fff;
    font-weight: 700;
}

.about-name {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a2e;
    margin-bottom: 8px;
}

.about-role {
    font-size: 14px;
    color: #777;
    margin-bottom: 16px;
}

.about-id {
    font-size: 13px;
    color: #999;
    background: #f8f6f1;
    padding: 8px 16px;
    display: inline-block;
}

/* Course Description */
.course-info {
    background: #fff;
    border: 1px solid #e5e5e5;
    padding: 32px;
    margin-bottom: 32px;
}

.course-info-title {
    font-size: 14px;
    font-weight: 600;
    color: #1a1a2e;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.course-info-item {
    display: flex;
    flex-direction: column;
}

.course-info-label {
    font-size: 12px;
    color: #999;
    margin-bottom: 4px;
}

.course-info-value {
    font-size: 16px;
    color: #1a1a2e;
    font-weight: 500;
}

/* Music Player */
.music-player {
    background: linear-gradient(135deg, #1a1a2e 0%, #2d2d5a 100%);
    border-radius: 16px;
    padding: 24px 28px;
    margin: 40px 0;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 10px 40px rgba(26, 26, 46, 0.3);
    position: relative;
    overflow: hidden;
}

.music-player::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 60%);
    animation: pulse-bg 4s ease-in-out infinite;
}

@keyframes pulse-bg {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.music-icon {
    width: 56px;
    height: 56px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.music-icon svg {
    width: 24px;
    height: 24px;
    fill: #fff;
}

.music-info {
    flex: 1;
    min-width: 0;
    position: relative;
    z-index: 1;
}

.music-title {
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 4px;
}

.music-subtitle {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
}

.music-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    z-index: 1;
}

.music-btn {
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: rgba(255,255,255,0.15);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.music-btn:hover {
    background: rgba(255,255,255,0.25);
    transform: scale(1.05);
}

.music-btn.play-btn {
    width: 52px;
    height: 52px;
    background: #fff;
    color: #1a1a2e;
}

.music-btn.play-btn:hover {
    background: #f0f0f0;
}

.music-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

audio {
    display: none;
}

/* YouTube Section */
.youtube-section {
    background: #fff;
    border: 1px solid #e5e5e5;
    border-radius: 12px;
    overflow: hidden;
    margin: 48px 0;
}

.youtube-header {
    background: linear-gradient(135deg, #ff0000 0%, #cc0000 100%);
    padding: 20px 28px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.youtube-icon {
    width: 48px;
    height: 48px;
    background: rgba(255,255,255,0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.youtube-icon svg {
    width: 28px;
    height: 28px;
    fill: #fff;
}

.youtube-title-wrap {
    flex: 1;
}

.youtube-label {
    font-size: 11px;
    font-weight: 600;
    color: rgba(255,255,255,0.8);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.youtube-title {
    font-size: 18px;
    font-weight: 600;
    color: #fff;
}

.youtube-content {
    padding: 28px;
}

.youtube-video {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 8px;
    background: #000;
}

.youtube-video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.youtube-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #2d2d5a 100%);
    color: #fff;
    text-decoration: none;
    transition: all 0.3s;
}

.youtube-placeholder:hover {
    background: linear-gradient(135deg, #2d2d5a 0%, #3d3d7a 100%);
}

.youtube-placeholder svg {
    width: 80px;
    height: 80px;
    fill: #ff0000;
    margin-bottom: 16px;
    filter: drop-shadow(0 4px 20px rgba(255,0,0,0.4));
    transition: transform 0.3s;
}

.youtube-placeholder:hover svg {
    transform: scale(1.1);
}

.youtube-placeholder span {
    font-size: 16px;
    font-weight: 500;
}

/* Team Page Styles */
.team-hero {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    padding: 100px 32px 120px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.team-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.team-hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(to top, #f8f6f1, transparent);
}

.team-hero-content {
    position: relative;
    z-index: 1;
}

.team-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.1);
    padding: 10px 20px;
    border-radius: 50px;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.team-badge-dot {
    width: 8px;
    height: 8px;
    background: #00d9a5;
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.team-badge span {
    font-size: 12px;
    font-weight: 600;
    color: rgba(255,255,255,0.9);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.team-hero h1 {
    font-size: clamp(40px, 7vw, 64px);
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
    text-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.team-hero p {
    font-size: 18px;
    color: rgba(255,255,255,0.7);
    max-width: 500px;
    margin: 0 auto;
}

/* Team Cards */
.team-section {
    max-width: 1000px;
    margin: -60px auto 0;
    padding: 0 32px 80px;
    position: relative;
    z-index: 2;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.team-card {
    background: #fff;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.1);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
}

.team-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 40px 80px rgba(0,0,0,0.15);
}

.team-card-header {
    height: 160px;
    position: relative;
    overflow: hidden;
}

.team-card:first-child .team-card-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.team-card:last-child .team-card-header {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.team-card-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.2;
    background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23fff' fill-opacity='1' fill-rule='evenodd'%3E%3Cpath d='M0 40L40 0H20L0 20M40 40V20L20 40'/%3E%3C/g%3E%3C/svg%3E");
}

.team-avatar-wrap {
    position: absolute;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
}

.team-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 6px solid #fff;
    background: #e5e5e5;
    object-fit: cover;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.team-avatar-placeholder {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 6px solid #fff;
    background: linear-gradient(135deg, #1a1a2e 0%, #2d2d5a 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 42px;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.team-card-body {
    padding: 70px 32px 32px;
    text-align: center;
}

.team-role-badge {
    display: inline-block;
    background: linear-gradient(135deg, #1a1a2e 0%, #2d2d5a 100%);
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 8px 16px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.team-name {
    font-size: 24px;
    font-weight: 700;
    color: #1a1a2e;
    margin-bottom: 8px;
}

.team-subtitle {
    font-size: 14px;
    color: #777;
    margin-bottom: 24px;
}

.team-info-grid {
    display: grid;
    gap: 12px;
    margin-bottom: 24px;
}

.team-info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #f8f6f1;
    border-radius: 10px;
}

.team-info-label {
    font-size: 12px;
    color: #999;
    font-weight: 500;
}

.team-info-value {
    font-size: 14px;
    color: #1a1a2e;
    font-weight: 600;
}

.team-responsibilities {
    background: linear-gradient(135deg, #f8f6f1 0%, #fff 100%);
    border-radius: 16px;
    padding: 20px;
    margin-top: 24px;
    border: 1px solid #e5e5e5;
}

.team-resp-title {
    font-size: 12px;
    font-weight: 600;
    color: #999;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.team-resp-list {
    list-style: none;
    text-align: left;
}

.team-resp-list li {
    font-size: 14px;
    color: #555;
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
}

.team-resp-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
}

.team-card:last-child .team-resp-list li::before {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

/* Project Info Section */
.project-info-section {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 32px 80px;
}

.project-info-card {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    border-radius: 24px;
    padding: 48px;
    position: relative;
    overflow: hidden;
}

.project-info-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(102,126,234,0.2) 0%, transparent 60%);
}

.project-info-header {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
}

.project-info-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}

.project-info-header p {
    font-size: 15px;
    color: rgba(255,255,255,0.6);
}

.project-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    position: relative;
    z-index: 1;
}

.project-info-item {
    background: rgba(255,255,255,0.05);
    border-radius: 16px;
    padding: 24px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.3s;
}

.project-info-item:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-4px);
}

.project-info-item-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.project-info-item-icon svg {
    width: 24px;
    height: 24px;
    fill: #fff;
}

.project-info-item-label {
    font-size: 12px;
    color: rgba(255,255,255,0.5);
    font-weight: 500;
    margin-bottom: 6px;
}

.project-info-item-value {
    font-size: 16px;
    color: #fff;
    font-weight: 600;
}

/* Footer */
footer {
    background: #1a1a2e;
    padding: 48px 32px;
    margin-top: 80px;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-text {
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #fff;
}

/* Responsive */
@media (max-width: 900px) {
    .chapters-grid {
        grid-template-columns: 1fr;
    }

    .chapter-card.featured {
        grid-column: span 1;
        grid-template-columns: 1fr;
    }

    .featured-visual {
        display: none;
    }

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

    .project-info-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 800px) {
    .content-wrapper {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .sidebar {
        position: static;
        padding-bottom: 32px;
        border-bottom: 1px solid #e5e5e5;
    }

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

    .nav-bottom {
        flex-direction: column;
        gap: 16px;
    }

    .nav-link {
        width: 100%;
        max-width: none;
    }

    .course-info-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .hero {
        padding: 80px 24px 60px;
    }

    .chapters-section {
        padding: 60px 24px;
    }

    .chapter-card {
        padding: 32px;
    }

    .chapter-header {
        padding: 32px 24px;
    }

    .content-wrapper {
        padding: 48px 24px;
    }

    .topbar-nav {
        display: none;
    }

    .footer-inner {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }

    .music-player {
        flex-direction: column;
        text-align: center;
        padding: 20px;
    }

    .music-info {
        order: -1;
    }

    .team-hero {
        padding: 80px 24px 100px;
    }

    .team-section {
        padding: 0 16px 60px;
    }

    .team-card-body {
        padding: 70px 20px 24px;
    }

    .project-info-card {
        padding: 32px 20px;
    }
}