/* Gilroy Font - You'll need to download and host these files locally */
@font-face {
    font-family: 'Gilroy';
    src: url('fonts/Gilroy-Regular.woff2') format('woff2'),
         url('fonts/Gilroy-Regular.woff') format('woff');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Gilroy';
    src: url('fonts/Gilroy-Medium.woff2') format('woff2'),
         url('fonts/Gilroy-Medium.woff') format('woff');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Gilroy';
    src: url('fonts/Gilroy-SemiBold.woff2') format('woff2'),
         url('fonts/Gilroy-SemiBold.woff') format('woff');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Gilroy';
    src: url('fonts/Gilroy-Bold.woff2') format('woff2'),
         url('fonts/Gilroy-Bold.woff') format('woff');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

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

body {
    font-family: 'Gilroy', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: #0a0a0a;
    color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    padding: 20px 0;
    border-bottom: 1px solid #333;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.register-btn {
    background: #ffffff;
    color: rgb(0, 0, 0);
    padding: 10px 20px;
    border: none;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.register-btn:hover {
    background: #929292;
}

/* Hero Section */
.hero {
    padding: 80px 0 60px;
    text-align: left;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    padding-top: 10%;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 18px;
    color: #a1a1aa;
    margin-bottom: 32px;
    max-width: 600px;
    line-height: 1.4;
}

.deadline {
    color: #a1a1aa;
    font-size: 18px;
    margin-bottom: 32px;
}

.submit-wildcard-btn {
    background: #ffffff;
    color: #000000;
    padding: 10px 20px;
    border: none;
    border-radius: 12px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-block;
}

.submit-wildcard-btn:hover {
    background: #929292;
}

/* Domain Tabs */
.domain-tabs {
    margin: 60px 0 40px;
    border-bottom: 1px solid #333;
}

.tabs-container {
    display: flex;
    gap: 0;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.tabs-container::-webkit-scrollbar {
    display: none;
}

.tab {
    padding: 16px 24px;
    color: #71717a;
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.tab.active {
    color: #ffffff;
    border-bottom-color: #ffffff;
}

.tab:hover {
    color: #ffffff;
}

/* Content Section */
.content {
    padding: 40px 0;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.description {
    font-size: 18px;
    color: #a1a1aa;
    margin-bottom: 40px;
    line-height: 1.4;
}

.section {
    margin-bottom: 48px;
}

.section h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #ffffff;
}

.problem-list, .instruction-list, .submit-list {
    list-style: none;
}

.problem-list li, .instruction-list li, .submit-list li {
    margin-bottom: 12px;
    padding-left: 24px;
    position: relative;
    color: #d4d4d8;
    font-size: 18px;
    line-height: 1.6;
}

.dataset-link {
  text-decoration: underline; /* underline line */
  text-decoration-style: dotted;
  color: inherit; /* inherit color from parent, usually black */
  transition: color 0.3s ease;
}

.dataset-link:hover {
  color: #b1b1b1; /* lighter text on hover */
  cursor: pointer;
}



.problem-list li::before, .instruction-list li::before, .submit-list li::before {
    content: counter(item);
    counter-increment: item;
    position: absolute;
    left: 0;
    top: 0;
    font-size: 18px;
    color: #ffffff;
    font-weight: 600;
}

.problem-list {
    counter-reset: item;
}

.instruction-list {
    counter-reset: item;
}

.submit-list {
    counter-reset: item;
}

/* FAQ Section */
.faq {
    margin-top: 80px;
}

.faq h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 40px;
    line-height: 1.2;
}

.faq-item {
    margin-bottom: 32px;
    border-bottom: 1px solid #333;
    padding-bottom: 24px;
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #ffffff;
}

.faq-answer {
    color: #a1a1aa;
    font-size: 18px;
    line-height: 1.7;
}

/* Footer */
.footer {
    margin-top: 80px;
    padding: 40px 0;
    border-top: 1px solid #333;
    text-align: center;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 32px;
}

.social-links a {
    color: #71717a;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
}

.social-links a:hover {
    color: #ffffff;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 60px 0 40px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .tabs-container {
        gap: 0;
    }

    .tab {
        padding: 12px 16px;
        font-size: 14px;
    }

    .faq h2 {
        font-size: 2rem;
    }

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

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

    .tab {
        padding: 12px 12px;
        font-size: 13px;
    }
}