/* --- RESET & VARIABLES (MIT Inspired Dark Theme) --- */
:root {
    /* Colors */
    --bg-light: #0d1117; /* GitHub dark mode background */
    --bg-alt: #161b22;
    --border-color: #30363d;
    
    --text-main: #f0f6fc;
    --text-muted: #8b949e;
    
    /* MIT Blue Tone */
    --mit-blue: #3b82f6; /* Lighter, vibrant blue for dark mode */
    --mit-blue-dark: #2563eb;
    
    /* Typography */
    --font-heading: 'Inter', -apple-system, sans-serif;
    --font-body: 'Inter', -apple-system, sans-serif;
    
    --transition: all 0.2s ease-in-out;
}

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

html {
    scroll-behavior: smooth; 
    overflow-x: hidden;
}

body {
    background-color: var(--bg-light);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--mit-blue);
    transition: var(--transition);
}

a:hover {
    color: var(--mit-blue-dark);
}

/* --- COMPONENTS --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 4px;
}

.btn-primary {
    background: var(--mit-blue);
    color: white;
}

.btn-primary:hover {
    background: var(--mit-blue-dark);
    color: white;
}

.btn-secondary {
    background: transparent;
    color: var(--text-main);
    border-color: var(--border-color);
}

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

/* --- NAVIGATION --- */
.navbar {
    position: sticky;
    top: 0;
    width: 100%;
    background: var(--bg-light);
    border-bottom: 4px solid var(--mit-blue);
    padding: 20px 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: 900;
    color: var(--text-main);
    letter-spacing: -1px;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    background: var(--mit-blue);
    color: white;
    padding: 6px;
    border-radius: 4px;
    display: flex;
    font-size: 1.8rem;
}

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

.nav-link {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-main);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-link:hover {
    color: var(--mit-blue);
    text-decoration: underline;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-main);
}

/* --- HERO SECTION --- */
.hero {
    max-width: 1200px;
    margin: 80px auto;
    padding: 0 24px;
}

.hero-content {
    max-width: 800px;
}

.hero-badge {
    text-transform: uppercase;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--mit-blue);
    font-size: 0.9rem;
    margin-bottom: 24px;
    display: inline-block;
    border-bottom: 3px solid var(--mit-blue);
}

.hero-title {
    font-size: 5rem;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -2px;
    font-weight: 900;
    color: var(--text-main);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 48px;
    max-width: 600px;
    font-weight: 400;
    line-height: 1.5;
}

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


/* --- SECTIONS --- */
.section {
    padding: 100px 24px;
}

.section-alt {
    background: var(--bg-alt);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: 60px;
}

.section-title {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -1.5px;
    color: var(--text-main);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 800px;
    line-height: 1.6;
}

/* --- ABOUT --- */
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.about-card {
    background: var(--bg-alt);
    border-top: 1px solid var(--border-color);
    padding: 32px;
    border-bottom: 1px solid var(--border-color);
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--mit-blue);
    margin-bottom: 24px;
}

.about-card h3 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.about-card p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* --- TEAM (SQUAD) --- */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.team-card {
    background: var(--bg-alt);
    border: 1px solid var(--border-color);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    border-radius: 4px;
    transition: var(--transition);
}

.team-card:hover {
    border-color: var(--mit-blue);
}

.team-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    color: var(--mit-blue);
    font-size: 1.2rem;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: inset 0 0 0 2px var(--bg-alt);
}

.team-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.team-info h4 {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 2px;
}

.team-info p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.3;
}

/* --- TECHPANEL SCHEDULE --- */
.schedule-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

.schedule-day {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
}

.day-header {
    background: var(--bg-alt);
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    border-bottom: 1px solid var(--border-color);
}

.day-header h3 {
    font-size: 2.2rem;
    font-weight: 900;
    letter-spacing: -1px;
    color: var(--text-main);
}

.day-header span {
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.session-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 0;
}

.session-card {
    padding: 32px;
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.session-card:nth-child(even) {
    background: var(--bg-alt);
}

.session-time {
    font-weight: 700;
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 12px;
    font-family: monospace;
}

.session-speaker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--mit-blue);
    letter-spacing: -0.5px;
}

.session-speaker i {
    color: #3b82f6; 
}

.session-speaker:hover {
    text-decoration: underline;
}

.group-speaker {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}

.group-speaker a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-main);
}

.group-speaker a i {
    color: #3b82f6;
    font-size: 1.1rem;
}

.group-speaker a:hover {
    text-decoration: underline;
    color: var(--mit-blue);
}

.session-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-top: 12px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.session-desc {
    color: var(--text-muted);
    margin-top: 8px;
    font-size: 1rem;
}

.session-card.special {
    background: #1e293b;
    border-color: #334155;
}

.session-card.special .highlight {
    color: #93c5fd;
}

.session-card.network, .session-card.pause {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-alt);
}

.session-card.network .session-title, 
.session-card.pause .session-title {
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* --- EVENTS --- */
.events-timeline {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.timeline-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 40px;
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
}

.event-date {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--mit-blue);
    letter-spacing: 1px;
}

.event-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.timeline-content p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 800px;
}

/* --- FOOTER --- */
.footer {
    background: #010409;
    color: #ffffff;
    padding: 80px 24px 40px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.footer-logo {
    font-size: 2.5rem;
    font-weight: 900;
    color: #ffffff;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.footer-info p {
    color: #8b949e;
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.footer-social h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    color: #ffffff;
    font-size: 2rem;
    transition: var(--transition);
    background: #161b22;
    padding: 12px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #30363d;
}

.social-links a:hover {
    background: var(--mit-blue);
    border-color: var(--mit-blue);
}

.footer-bottom {
    max-width: 1200px;
    margin: 60px auto 0;
    padding-top: 24px;
    border-top: 1px solid #30363d;
    color: #8b949e;
    font-size: 0.95rem;
}

/* --- RESPONSIVE --- */
@media (max-width: 968px) {
    .hero-title {
        font-size: 4rem;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .timeline-item {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .footer-content {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 768px) {
    .mobile-toggle { display: block; }
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-light);
        padding: 24px;
        border-bottom: 4px solid var(--mit-blue);
    }
    .nav-links.active { display: flex; }
    .hero-title { font-size: 3rem; }
}