:root {
    --bg: #080711;
    --bg-elevated: #0f0e1c;
    --accent-cyan: #00f2fe;
    --accent-purple: #7f77dd;
    --text-primary: #f2f2f7;
    --text-main: #f2f2f7;
    --text-muted: #a0a5c0;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);
    --radius: 14px;
    --font-display: 'Outfit', sans-serif;

    --container-padding: clamp(1.25rem, 4vw, 3rem);
    --section-padding: clamp(2.5rem, 6vw, 5rem);
    --h1-size: clamp(2rem, 5vw + 1rem, 3.5rem);
    --h2-size: clamp(1.6rem, 3vw + 1rem, 2.4rem);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text-primary);
    font-family: var(--font-display);
    font-weight: 300;
    line-height: 1.6;
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    padding-top: 80px;
}

#webgl-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    z-index: -1;
}

a {
    color: inherit;
}

img, video, canvas, svg {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 3rem;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 500;
    transition: background-color 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
}

header.scrolled {
    background-color: rgba(8, 7, 17, 0.6);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.logo {
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: 0.02em;
    text-decoration: none;
    color: var(--text-primary);
}

.logo img {
    max-height: 36px;
    vertical-align: middle;
}
.logo .logo-icon {
    display: none;
}

/* New Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-left: auto;
}
.header-contact-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}
.header-contact-link:hover {
    color: var(--accent-cyan);
}
.header-register-btn {
    padding: 0.6rem 1.2rem;
}
header nav#navDrawer {
    display: flex;
    align-items: center;
    gap: 2.25rem;
}

header nav#navDrawer a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 400;
    transition: color 0.2s ease;
    position: relative;
}

header nav#navDrawer a:hover,
header nav#navDrawer a.active {
    color: var(--accent-cyan);
}

header nav#navDrawer a.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 2px;
}

button.hamburger-btn {
    display: none;
}

.btn-primary {
    display: inline-block;
    padding: 0.9rem 2.1rem;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: #06060c;
    font-weight: 600;
    text-decoration: none;
    letter-spacing: 0.01em;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    box-shadow: 0 0 0 rgba(0, 242, 254, 0);
    text-align: center;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 242, 254, 0.25);
}

.btn-secondary {
    display: inline-block;
    padding: 0.85rem 2rem;
    border-radius: 999px;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-strong);
    text-decoration: none;
    font-weight: 400;
    transition: border-color 0.2s ease, color 0.2s ease;
    text-align: center;
}

.btn-secondary:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.btn-secondary.disabled {
    color: var(--text-muted);
    border-color: var(--border);
    opacity: 0.7;
    cursor: not-allowed;
    pointer-events: none;
}

.tilt-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(6px);
}

.card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: clamp(1.25rem, 3vw, 2rem);
}

.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}
.tag {
    background: rgba(255, 255, 255, 0.08);
    padding: 0.25rem 0.6rem;
    border-radius: 5px;
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-muted);
}
section {
    padding: var(--section-padding) 0;
}

.section-heading {
    text-align: center;
    margin-bottom: clamp(2rem, 5vw, 3rem);
    padding: 0 var(--container-padding);
}

.section-heading .eyebrow {
    color: var(--accent-cyan);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    font-weight: 600;
}

.section-heading h2 {
    font-size: var(--h2-size);
    font-weight: 600;
    margin: 0.5rem 0 0;
}

h1 {
    font-size: var(--h1-size);
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(6px);
}
.sponsorship-table, .schedule-table {
    width: 100%;
    min-width: 600px;
    border-collapse: collapse;
    text-align: left;
}
.sponsorship-table th, .sponsorship-table td,
.schedule-table th, .schedule-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}
.sponsorship-table tbody tr:last-child td,
.schedule-table tbody tr:last-child td {
    border-bottom: none;
}
.sponsorship-table th {
    color: var(--text-primary);
    font-weight: 600;
}
.sponsorship-table td {
    color: var(--text-muted);
}
.sponsorship-table thead {
    background: rgba(255, 255, 255, 0.05);
}
.sponsorship-table td:not(:first-child) {
    text-align: center;
}
.sponsorship-table .check {
    color: var(--accent-cyan);
    font-weight: bold;
    font-size: 1.2rem;
}
.sponsorship-table .cross {
    color: var(--text-muted);
    opacity: 0.5;
    font-size: 1.1rem;
}
.schedule-table td:first-child {
    color: var(--accent-cyan);
    font-weight: 600;
    white-space: nowrap;
}

/* Tabs */
.tabs-container {
    width: 100%;
}
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
}
.tab-button {
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 400;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
    margin-bottom: -1px; /* Overlap border */
}
.tab-button:hover {
    color: var(--text-primary);
}
.tab-button.active {
    color: var(--accent-cyan);
    font-weight: 600;
    border-bottom-color: var(--accent-cyan);
}
.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}
.placeholder-card {
    text-align: center;
    padding: 4rem 2rem;
}

/* Sponsors & Panel Members */
.sponsor-logo {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.sponsor-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: grayscale(1) brightness(1.5);
    transition: filter 0.3s ease;
}
.sponsor-logo:hover img {
    filter: none;
}

.panel-member {
    text-align: center;
}
.panel-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    padding: 3px;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.2);
}
.panel-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid var(--bg);
    background-color: var(--bg-elevated);
}

footer {
    text-align: center;
    padding: 2.5rem 1.25rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
    margin-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 2rem;
    text-align: left;
}
.footer-about .logo {
    font-size: 1.5rem;
}
.footer-about .logo img {
    max-height: 40px;
}
.footer-socials {
    margin-top: 1.5rem;
    display: flex;
    gap: 1.25rem;
}
.footer-socials svg {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    transition: color 0.2s ease;
}
.footer-socials a:hover svg {
    color: var(--text-primary);
}
.footer-tagline {
    color: var(--text-muted);
    font-size: 0.9rem;
    max-width: 350px;
}
.footer-links h4, .footer-contact h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}
.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.footer-links a {
    text-decoration: none;
    color: var(--text-muted);
    transition: color 0.2s ease;
}
.footer-links a:hover {
    color: var(--accent-cyan);
}
.footer-legal-links {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}
.footer-legal-links a {
    font-size: 0.8rem;
    color: #888c9f; /* More muted */
}
.footer-contact p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0 0 0.5rem 0;
}
.copyright {
    font-size: 0.8rem;
    margin-top: 2rem;
}
.footer-credit {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.footer-credit a {
    display: inline-flex;
    align-items: center;
}
.footer-credit img {
    height: 18px;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}
.footer-credit a:hover img {
    opacity: 1;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
    html {
        scroll-behavior: auto;
    }
}

@media screen and (min-width: 1440px) {
    .container {
        max-width: 1280px;
    }
    .grid-3, .grid-4 {
        gap: 2rem;
    }
}

@media screen and (max-width: 1024px) and (min-width: 769px) {
    header {
        padding: 1.25rem 1.75rem;
    }
    header nav#navDrawer {
        gap: 1.25rem;
    }
    .header-actions {
        display: none;
    }
    header nav#navDrawer a {
        font-size: 0.85rem;
    }
    .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 768px) {

    header {
        z-index: 100000;
        padding: 1.25rem 1.5rem;
    }

    .header-actions {
        display: none;
    }

    button.hamburger-btn {
        display: flex !important;
        flex-direction: column !important;
        justify-content: space-between !important;
        width: 28px !important;
        height: 20px !important;
        background: transparent !important;
        border: none !important;
        cursor: pointer !important;
        position: relative !important;
        z-index: 100002 !important;
        padding: 0 !important;
        touch-action: manipulation !important;
    }

    button.hamburger-btn span {
        display: block !important;
        width: 100% !important;
        height: 3px !important;
        background-color: #ffffff !important;
        border-radius: 3px !important;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    }

    header nav#navDrawer {
        position: fixed !important;
        top: 0 !important;
        right: -100% !important;
        width: 80% !important;
        max-width: 300px !important;
        height: 100vh !important;
        height: 100dvh !important;
        background-color: #080711 !important;
        border-left: 1px solid rgba(255, 255, 255, 0.08) !important;
        display: flex !important;
        flex-direction: column !important;
        justify-content: center !important;
        align-items: center !important;
        gap: 2rem !important;
        transition: right 0.35s ease-in-out !important;
        z-index: 100001 !important;
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.9) !important;
        overflow-y: auto !important;
    }

    /* Mobile-only actions in nav drawer */
    .nav-drawer-actions {
        display: flex !important;
        flex-direction: column;
        gap: 1rem;
        margin-top: 2rem;
        padding-top: 2rem;
        border-top: 1px solid var(--border);
        width: 80%;
    }

    header nav#navDrawer a {
        font-size: 1.15rem !important;
        color: #a0a5c0 !important;
        text-decoration: none !important;
        width: 100% !important;
        text-align: center !important;
        padding: 0.75rem 0 !important;
    }

    header nav#navDrawer a:hover,
    header nav#navDrawer a.active {
        color: #00f2fe !important;
        font-weight: 600 !important;
    }
    header nav#navDrawer a.active::after {
        content: none !important;
    }

    header nav#navDrawer.active {
        right: 0 !important;
    }

    button.hamburger-btn.active span:nth-child(1) {
        transform: translateY(8.5px) rotate(45deg) !important;
    }
    button.hamburger-btn.active span:nth-child(2) {
        opacity: 0 !important;
    }
    button.hamburger-btn.active span:nth-child(3) {
        transform: translateY(-8.5px) rotate(-45deg) !important;
    }

    .tilt-card {
        transform: none !important;
    }

    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr !important;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-about .logo, .footer-tagline { margin-left: auto; margin-right: auto; }
    .footer-credit {
        justify-content: center;
    }
    .footer-socials {
        justify-content: center;
    }

    .container {
        padding: 0 1.25rem;
    }
}

@media screen and (max-width: 480px) {
    header {
        padding: 1rem 1.25rem;
    }

    .logo .logo-main {
        display: none;
    }
    .logo .logo-icon {
        display: inline;
        max-height: 32px;
    }

    .logo {
        font-size: 1.1rem;
    }

    .card {
        padding: 1.25rem;
    }

    .btn-primary,
    .btn-secondary {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }

    footer {
        padding: 2rem 1rem;
    }
}

@media screen and (max-width: 900px) and (orientation: landscape) and (max-height: 500px) {
    header nav#navDrawer {
        justify-content: flex-start !important;
        padding-top: 4rem !important;
        gap: 1.25rem !important;
    }

    section {
        padding: 2.5rem 0;
    }
}

@media print {
    #webgl-bg,
    button.hamburger-btn,
    .btn-primary,
    .btn-secondary {
        display: none !important;
    }
    body {
        background: #fff;
        color: #000;
    }
}