:root {
    --primary: #0f4c81;
    --primary-dark: #083d6e;
    --primary-light: #e6f0f9;
    --accent: #00b4d8;
    --accent-light: #e0f7fb;
    --amber: #f59e0b;
    --amber-light: #fef3c7;
    --text: #1e293b;
    --text-light: #64748b;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-dark: #0f172a;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --radius: 16px;
    --radius-lg: 24px;
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    transition: box-shadow 0.3s ease, background 0.3s ease;
}

.site-header.scrolled {
    box-shadow: var(--shadow);
    background: rgba(255, 255, 255, 0.98);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
    font-weight: 800;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.logo-img {
    width: auto;
    height: 42px;
    border-radius: 10px;
    display: block;
    box-shadow: var(--shadow-sm);
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-list a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 8px 16px;
    border-radius: 50px;
    transition: all 0.2s ease;
    position: relative;
}

.nav-list a:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-list a.active {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s ease;
}

/* Hero */
.hero {
    position: relative;
    padding: 160px 0 100px;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f4c81 100%);
    color: white;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle, rgba(0, 180, 216, 0.15) 0%, transparent 60%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.1) 0%, transparent 55%);
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 80px;
    align-items: center;
}

.hero-subtitle {
    display: inline-block;
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 24px;
    color: rgba(255, 255, 255, 0.9);
}

.hero h1 {
    font-size: 3.4rem;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.03em;
}

.hero-description {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 560px;
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 50px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #0891b2);
    color: white;
    box-shadow: 0 10px 20px -5px rgba(0, 180, 216, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px -5px rgba(0, 180, 216, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.12);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.22);
    transform: translateY(-2px);
}

.hero-visual {
    display: flex;
    flex-direction: column;
    gap: 24px;
    align-items: stretch;
    width: 400px;
}

.hero-logo {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
}

.hero-logo img {
    width: 100%;
    height: auto;
    display: block;
}

.hero-stats {
    display: flex;
    flex-direction: row;
    gap: 16px;
    width: 100%;
}

/* Page Hero (inner pages) */
.page-hero {
    position: relative;
    padding: 140px 0 70px;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f4c81 100%);
    color: white;
    overflow: hidden;
}

.page-hero::before,
.page-hero::after {
    content: '';
    position: absolute;
    pointer-events: none;
}

.page-hero::before {
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle, rgba(0, 180, 216, 0.15) 0%, transparent 60%);
}

.page-hero::after {
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.1) 0%, transparent 55%);
}

.page-hero .container {
    position: relative;
    z-index: 1;
    text-align: center;
}

.page-hero-subtitle {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 18px;
    color: rgba(255, 255, 255, 0.9);
}

.page-hero h1 {
    font-size: 2.8rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.page-hero-description {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 620px;
    margin: 0 auto 32px;
    line-height: 1.8;
}

.hero-meta {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    max-width: 900px;
    margin: 0 auto;
}

.hero-meta-item {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius);
    padding: 18px 16px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.hero-meta-item:hover {
    background: rgba(255, 255, 255, 0.16);
    transform: translateY(-3px);
}

.hero-meta-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    opacity: 0.75;
    margin-bottom: 6px;
}

.hero-meta-value {
    display: block;
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.5;
}

.page-hero-current {
    padding-bottom: 90px;
}

.stat-item {
    display: flex;
    align-items: baseline;
    justify-content: center;
    flex: 1;
    gap: 8px;
    padding: 20px 24px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius);
    backdrop-filter: blur(10px);
}

.stat-number {
    font-size: 2.6rem;
    font-weight: 900;
    background: linear-gradient(135deg, #67e8f9, #a5f3fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.75);
    font-weight: 600;
}

/* Sections */
.section {
    padding: 110px 0;
}

.section-header {
    max-width: 720px;
    margin: 0 auto 64px;
    text-align: center;
}

.section-header.light {
    color: white;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    margin-bottom: 18px;
    text-transform: uppercase;
}

.section-header.light .section-tag {
    background: rgba(255, 255, 255, 0.15);
    color: white;
}

.section-header h2 {
    font-size: 2.6rem;
    font-weight: 900;
    margin-bottom: 18px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 1.15rem;
    color: var(--text-light);
    line-height: 1.8;
}

.section-header.light p {
    color: rgba(255, 255, 255, 0.8);
}

/* About */
.about {
    background: var(--bg-alt);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.about-card {
    background: white;
    padding: 36px 28px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border);
    text-align: center;
}

.about-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.about-icon {
    font-size: 2.8rem;
    margin-bottom: 20px;
}

.about-card h3 {
    font-size: 1.25rem;
    margin-bottom: 14px;
    color: var(--text);
    font-weight: 700;
}

.about-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.8;
}

.about-features {
    margin-top: 80px;
    padding-top: 80px;
    border-top: 1px solid var(--border);
}

.about-features-title {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 48px;
    color: var(--text);
    font-weight: 800;
}

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

.feature-item {
    background: white;
    padding: 36px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.feature-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: white;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 900;
    line-height: 1;
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    font-weight: 700;
}

.feature-item p {
    color: var(--text-light);
    line-height: 1.8;
}

/* Current Conference */
.current-section {
    background: var(--bg-alt);
}

.current-card {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.current-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 24px 40px -12px rgba(15, 76, 129, 0.18);
}

.current-body {
    padding: 48px 56px;
}

.current-meta-detail {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px 40px;
    padding: 28px 32px;
    margin-bottom: 28px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.current-meta-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.current-label {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-light);
}

.current-value {
    font-size: 1.05rem;
    line-height: 1.55;
    font-weight: 600;
    color: var(--text);
}

.current-body h4 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--text);
    font-weight: 800;
}

.current-body ul {
    list-style: none;
    margin-bottom: 28px;
}

.current-body li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

.current-body li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 10px;
    height: 10px;
    background: var(--accent);
    border-radius: 50%;
}

.current-note {
    padding: 18px 24px;
    background: var(--accent-light);
    color: #0e7490;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 1rem;
    border-left: 4px solid var(--accent);
}

.current-gallery {
    max-width: 900px;
    margin: 56px auto 0;
    background: white;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.current-gallery h3 {
    font-size: 1.5rem;
    margin-bottom: 28px;
    color: var(--text);
    font-weight: 800;
    text-align: center;
}

.current-gallery h4 {
    font-size: 1.2rem;
    margin: 32px 0 20px;
    color: var(--text);
    font-weight: 700;
    text-align: center;
}

.current-gallery h4:first-of-type {
    margin-top: 0;
}

.current-gallery ul {
    list-style: none;
    margin-bottom: 28px;
}

.current-gallery li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

.current-gallery li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 10px;
    height: 10px;
    background: var(--accent);
    border-radius: 50%;
}

.current-gallery img {
    width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: white;
    display: block;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.current-gallery img:hover {
    transform: scale(1.015);
    box-shadow: var(--shadow-lg);
}

.speaker-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.speaker-grid img {
    width: 100%;
    height: auto;
    object-fit: cover;
    aspect-ratio: 2 / 3;
}

.quick-nav {
    position: -webkit-sticky;
    position: sticky;
    top: 72px;
    z-index: 100;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin: 0 auto 56px;
    max-width: 900px;
    padding: 16px 24px;
    background: rgba(248, 250, 252, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    border-radius: 0 0 var(--radius) var(--radius);
}

.quick-nav-link {
    display: inline-flex;
    align-items: center;
    padding: 10px 22px;
    background: white;
    color: var(--text-light);
    border: 1px solid var(--border);
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.quick-nav-link:hover {
    color: var(--primary);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.quick-nav-link.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.registration-card {
    background: linear-gradient(135deg, var(--primary-light), #e0f7fb);
    border-color: rgba(0, 180, 216, 0.3);
}

.registration-content {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 32px;
    align-items: center;
    max-width: 720px;
    margin: 0 auto;
}

.registration-content img {
    width: 100%;
    max-width: 180px;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: white;
    padding: 12px;
}

.registration-content p {
    color: var(--text-light);
    line-height: 1.9;
    font-size: 1.05rem;
}

.registration-content strong {
    color: var(--primary);
}

/* History */
.history {
    background: var(--bg-dark);
    color: white;
    position: relative;
    overflow: hidden;
}

.history::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 10% 20%, rgba(0, 180, 216, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(245, 158, 11, 0.1) 0%, transparent 40%);
    pointer-events: none;
}

.history-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.history-phase {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.history-phase:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-6px);
    border-color: rgba(0, 180, 216, 0.4);
}

.phase-year {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, var(--accent), var(--primary));
    color: white;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 800;
    margin-bottom: 18px;
    letter-spacing: 1px;
}

.history-phase h3 {
    font-size: 1.5rem;
    margin-bottom: 14px;
    font-weight: 800;
}

.history-phase p {
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.9;
}

/* Timeline */
.timeline-section {
    background: var(--bg-alt);
}

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 28px;
    width: 3px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
    border-radius: 3px;
}

.timeline-item {
    position: relative;
    padding-left: 84px;
    padding-bottom: 52px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: 0;
    top: 0;
    width: 58px;
    height: 58px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border: 3px solid white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.1rem;
    color: white;
    box-shadow: 0 0 0 8px rgba(15, 76, 129, 0.08), var(--shadow);
    transition: all 0.3s ease;
}

.timeline-item:hover .timeline-marker {
    background: linear-gradient(135deg, var(--accent), var(--primary));
    transform: scale(1.1);
    box-shadow: 0 0 0 12px rgba(15, 76, 129, 0.12), var(--shadow-lg);
}

.timeline-content {
    background: white;
    padding: 30px 34px;
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    border-left-width: 4px;
}

.timeline-item:hover .timeline-content {
    box-shadow: var(--shadow-lg);
    transform: translateX(6px) translateY(-4px);
    border-color: var(--accent);
    border-left-color: var(--accent);
}

.timeline-meta {
    display: flex;
    gap: 14px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.timeline-year {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 800;
    font-size: 0.85rem;
    border-radius: 50px;
}

.timeline-city {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-light);
    color: #0e7490;
    font-size: 0.85rem;
    font-weight: 700;
    border-radius: 50px;
}

.timeline-content h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
    font-weight: 800;
}

.timeline-theme {
    color: #0e7490;
    font-weight: 700;
    margin-bottom: 12px;
    font-size: 1rem;
}

.timeline-content > p:not(.timeline-theme) {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 8px;
}

.timeline-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 14px;
    padding: 8px 16px;
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 50px;
    transition: all 0.2s ease;
}

.timeline-more::after {
    content: '→';
    transition: transform 0.2s ease;
}

.timeline-item:hover .timeline-more {
    background: var(--primary);
    color: white;
}

.timeline-item:hover .timeline-more::after {
    transform: translateX(4px);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal[hidden] {
    display: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(4px);
}

.modal-container {
    position: relative;
    width: 100%;
    max-width: 820px;
    max-height: calc(100vh - 48px);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    animation: modal-in 0.25s ease;
}

@keyframes modal-in {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.05);
    border: none;
    border-radius: 50%;
    font-size: 1.8rem;
    line-height: 1;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 10;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.1);
    transform: rotate(90deg);
}

.modal-header {
    padding: 36px 36px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-meta {
    display: flex;
    gap: 14px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.modal-year {
    color: var(--primary);
    font-weight: 800;
    font-size: 0.95rem;
}

.modal-city {
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 600;
}

.modal-header h3 {
    font-size: 1.7rem;
    margin-bottom: 10px;
    line-height: 1.3;
    font-weight: 800;
}

.modal-theme {
    color: #0e7490;
    font-weight: 700;
    font-size: 1.05rem;
}

.modal-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    padding: 28px 36px;
    background: var(--bg-alt);
}

.modal-gallery img {
    width: 100%;
    height: auto;
    max-height: 300px;
    object-fit: cover;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: white;
    transition: transform 0.3s ease;
}

.modal-gallery img:hover {
    transform: scale(1.02);
}

.modal-body {
    padding: 28px 36px 36px;
}

.modal-description {
    color: var(--text);
    line-height: 2;
    font-size: 1.05rem;
    white-space: pre-line;
}

/* Footer */
.site-footer {
    background: var(--bg-dark);
    color: white;
    padding: 72px 0 28px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 32px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 28px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-brand .logo-img {
    height: 48px;
    border-radius: 10px;
}

.footer-brand strong {
    display: block;
    font-size: 1.15rem;
    margin-bottom: 4px;
    font-weight: 800;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 14px;
}

.footer-links h4 {
    color: white;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.friend-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 12px 28px;
}

.friend-links a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    transition: color 0.2s ease;
    white-space: nowrap;
    font-weight: 500;
    padding: 6px 0;
}

.friend-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.45);
    font-size: 0.9rem;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
}

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

/* Responsive */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-visual {
        width: 100%;
        max-width: 420px;
        margin: 0 auto;
    }

    .hero-logo {
        max-width: 280px;
        margin: 0 auto;
    }

    .hero-stats {
        justify-content: center;
    }

    .about-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .history-content {
        grid-template-columns: 1fr;
    }

    .current-meta-detail {
        grid-template-columns: 1fr;
    }

    .hero-meta {
        grid-template-columns: repeat(2, 1fr);
    }

    .speaker-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .page-hero {
        padding: 120px 0 56px;
    }

    .page-hero h1 {
        font-size: 2.2rem;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-list {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        gap: 4px;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav-list.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list li {
        border-bottom: 1px solid var(--border);
    }

    .nav-list li:last-child {
        border-bottom: none;
    }

    .nav-list a {
        display: block;
        padding: 14px 0;
        border-radius: 0;
    }

    .nav-list a:hover,
    .nav-list a.active {
        background: transparent;
    }

    .hero {
        padding: 130px 0 70px;
    }

    .hero h1 {
        font-size: 2.4rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .stat-number {
        font-size: 2.2rem;
    }

    .section {
        padding: 80px 0;
    }

    .section-header h2 {
        font-size: 2rem;
    }

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

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        padding-left: 68px;
    }

    .timeline-marker {
        width: 46px;
        height: 46px;
        font-size: 0.9rem;
    }

    .timeline-content {
        padding: 24px;
    }

    .modal {
        padding: 16px;
    }

    .modal-container {
        max-height: calc(100vh - 32px);
    }

    .modal-header,
    .modal-body {
        padding-left: 24px;
        padding-right: 24px;
    }

    .modal-gallery {
        grid-template-columns: 1fr;
        padding: 20px 24px;
    }

    .modal-header h3 {
        font-size: 1.35rem;
    }

    .current-body {
        padding: 32px 28px;
    }

    .current-meta-detail {
        padding: 22px 24px;
        gap: 16px;
    }

    .current-gallery {
        padding: 28px 24px;
    }

    .quick-nav {
        gap: 10px;
        margin-bottom: 40px;
        padding: 12px 16px;
        top: 72px;
    }

    .quick-nav-link {
        padding: 10px 18px;
        font-size: 0.9rem;
    }

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

    .registration-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 24px;
    }

    .registration-content img {
        margin: 0 auto;
    }

    .hero-meta {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .hero-meta-item {
        padding: 14px 16px;
    }

    .page-hero {
        padding: 110px 0 48px;
    }

    .page-hero h1 {
        font-size: 1.9rem;
    }

    .page-hero-description {
        font-size: 1rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-brand {
        flex-direction: column;
    }

    .footer-links {
        align-items: center;
    }

    .friend-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.9rem;
    }

    .hero-stats {
        flex-direction: column;
    }

    .stat-item {
        justify-content: center;
    }

    .btn {
        width: 100%;
    }

    .hero-actions {
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
    }
}