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

:root {
    /* Color Palette */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    
    --text-primary: #0f172a;       /* Slate 900 */
    --text-secondary: #475569;     /* Slate 600 */
    --text-muted: #64748b;         /* Slate 500 */
    
    --accent-primary: #2563eb;     /* Blue 600 */
    --accent-hover: #1d4ed8;       /* Blue 700 */
    --accent-light: #eff6ff;       /* Blue 50 */
    
    --border-color: #e2e8f0;       /* Slate 200 */
    --border-hover: #cbd5e1;       /* Slate 300 */
    
    /* Shadows */
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    
    /* Typography */
    --font-main: 'Outfit', sans-serif;
    
    /* Spacing & Sizes */
    --max-width: 1200px;
    --nav-height: 72px;
    --section-pad: 90px 20px;
    --border-radius: 12px;
    
    /* Transitions */
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Typography Utility */
h1, h2, h3, h4 {
    line-height: 1.25;
    font-weight: 700;
    color: var(--text-primary);
}

.gradient-text {
    color: var(--accent-primary);
}

/* Section Common */
section {
    padding: var(--section-pad);
    position: relative;
}

section:nth-of-type(even) {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: clamp(2rem, 3.5vw, 2.75rem);
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 650px;
    margin: 0 auto;
}

/* Card Common */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

nav.scrolled {
    box-shadow: var(--shadow-sm);
    background-color: rgba(255, 255, 255, 0.95);
}

.nav-container {
    width: 100%;
    max-width: var(--max-width);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-accent {
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

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

.hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--text-primary);
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    margin: 5px auto;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 20px 80px;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: var(--accent-light);
    color: var(--accent-primary);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(37, 99, 235, 0.15);
}

.hero h1 {
    font-size: clamp(2.25rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 36px;
}

.hero-details {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-detail-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    padding: 8px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.hero-detail-item svg {
    color: var(--accent-primary);
    width: 18px;
    height: 18px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-secondary {
    background-color: #ffffff;
    color: var(--text-primary);
    border-color: var(--border-color);
}

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

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: start;
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-sidebar {
    padding: 32px;
}

.about-sidebar-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.about-sidebar p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Topics Section */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.topic-card {
    padding: 32px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.icon-wrapper {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    background-color: var(--accent-light);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.icon-wrapper svg {
    width: 20px;
    height: 20px;
}

.topic-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.topic-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Format Section */
.format-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.format-card {
    padding: 36px;
}

.format-card h3 {
    font-size: 1.35rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.format-card h3 svg {
    color: var(--accent-primary);
}

.format-meta {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-primary);
    background-color: var(--accent-light);
    padding: 4px 12px;
    border-radius: 6px;
    display: inline-block;
    margin-bottom: 16px;
}

.format-card p {
    color: var(--text-secondary);
    font-size: 0.975rem;
}

/* Committee Section */
.committee-wrapper {
    margin-bottom: 60px;
}

.committee-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 32px;
    text-align: center;
    letter-spacing: -0.01em;
}

.chairs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 64px;
}

.chair-card {
    padding: 36px;
}

.chair-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.chair-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background-color: var(--accent-light);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    border: 1px solid rgba(37, 99, 235, 0.15);
}

.chair-info h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.chair-info p {
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.chair-email {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-decoration: none;
    display: block;
    margin-top: 2px;
    transition: var(--transition);
}

.chair-email:hover {
    color: var(--accent-primary);
}

.chair-card p.bio {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.tpc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.tpc-member {
    padding: 20px;
    text-align: center;
}

.tpc-member h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.tpc-member p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
}

/* Footer */
footer {
    background-color: var(--bg-secondary);
    padding: 60px 20px 40px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto 40px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 32px;
}

.footer-info {
    max-width: 500px;
}

.footer-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 12px;
}

.footer-nav {
    display: flex;
    gap: 40px;
}

.footer-nav-col h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.footer-nav-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-nav-col a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.footer-bottom {
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Dates Section */
.dates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.date-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
}

.date-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--accent-light);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border: 1px solid rgba(37, 99, 235, 0.15);
}

.date-icon svg {
    width: 22px;
    height: 22px;
}

.date-details {
    display: flex;
    flex-direction: column;
}

.date-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.date-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 4px;
}

/* Scroll Animations */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 992px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-pad: 60px 20px;
    }

    nav {
        background-color: #ffffff;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--nav-height));
        background: #ffffff;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: var(--transition);
        border-top: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .hamburger {
        display: block;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    
    .format-grid, .chairs-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .hero {
        padding-top: 100px;
        min-height: auto;
    }

    .hero h1 {
        font-size: 2.25rem;
    }
    
    .hero-details {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }

    .footer-content {
        flex-direction: column;
        gap: 32px;
    }

    .footer-nav {
        width: 100%;
        justify-content: space-between;
    }
}