:root {
    --primary-color: #0f766e;
    --secondary-color: #22d3ee;
    --accent-color: #a3ff12;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5f5;
    --text-muted: #8b97b5;
    --bg-primary: #050b1a;
    --bg-secondary: #0f172a;
    --bg-card: #15233d;
    --border-color: #223352;
    --shadow-light: rgba(34, 211, 238, 0.12);
    --shadow-heavy: rgba(4, 12, 28, 0.7);
    --shadow-lg: 0 12px 30px rgba(5, 18, 38, 0.45);
    --primary-gradient: linear-gradient(140deg, #0f172a 0%, #0f766e 45%, #22d3ee 100%);
    --gradient-primary: linear-gradient(140deg, #0f172a 0%, #0f766e 45%, #22d3ee 100%);
    --gradient-accent: linear-gradient(140deg, #d4ff5e 0%, #7fff45 45%, #4ade80 100%);
    --border-radius: 16px;
    --border-radius-small: 10px;
    --transition-fast: 0.18s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
}

.navbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.year-badge {
    background: var(--primary-gradient);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font: inherit;
    padding: 0;
}

.nav-dropdown-toggle:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 4px;
}

.nav-dropdown .chevron {
    font-size: 0.75rem;
    transition: transform var(--transition-fast);
}

.nav-dropdown:hover .chevron,
.nav-dropdown:focus-within .chevron {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    box-shadow: var(--shadow-lg);
    padding: 0.75rem 0;
    display: none;
    flex-direction: column;
    z-index: 110;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
    display: flex;
}

.nav-dropdown-menu a {
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-dropdown-menu a:hover {
    background: rgba(34, 211, 238, 0.08);
    color: var(--primary-color);
}

.main {
    min-height: calc(100vh - 200px);
}

.hero {
    background: var(--primary-gradient);
    color: white;
    text-align: center;
    padding: 4rem 0;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.hero-competition {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent-color);
    opacity: 0.9;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary {
    background: var(--gradient-accent);
    color: #0b1120;
    border: none;
}

.btn-secondary {
    background: rgba(34, 211, 238, 0.12);
    color: var(--secondary-color);
    border: 1px solid rgba(34, 211, 238, 0.35);
}

.btn-primary:hover, .btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.features {
    padding: 4rem 0;
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.timeline-progress {
    max-width: 600px;
    margin: 0 auto 4rem;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    margin-bottom: 1rem;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: width 0.5s ease;
}

.progress-stages {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.stage-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 3px solid var(--border-color);
    transition: all 0.3s ease;
}

.stage.active .stage-dot {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 20px var(--shadow-light);
}

.stage.completed .stage-dot {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.stage-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
}

.stage.active .stage-label {
    color: var(--primary-color);
}

.stage.completed .stage-label {
    color: var(--accent-color);
}

.round-section {
    margin-bottom: 4rem;
}

.round-title {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.round-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.round-name {
    font-size: 2rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.round-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-left: auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-card);
    border-radius: 0.75rem;
    padding: 0;
    padding-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-heavy);
    transition: transform 0.3s, box-shadow 0.3s;
    overflow: hidden;
    position: relative;
}

.feature-card:hover:not(.coming-soon):not(.upcoming):not(.locked) {
    transform: translateY(-4px);
    box-shadow: var(--shadow-light);
}

.feature-card.completed {
    border-color: rgba(163, 255, 18, 0.3);
}

.feature-card.completed::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
}

.feature-card.upcoming {
    opacity: 0.85;
}

.feature-card.locked {
    opacity: 0.6;
}

.card-header {
    background: var(--primary-gradient);
    padding: 1rem 2rem;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.card-date {
    padding: 0 2rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.round-badge {
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
}

.round-badge.upcoming {
    opacity: 0.8;
}

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.status-badge.completed {
    background: rgba(163, 255, 18, 0.2);
    color: var(--accent-color);
}

.status-badge.upcoming {
    background: rgba(34, 211, 238, 0.2);
    color: var(--secondary-color);
}

.status-badge.locked {
    background: rgba(139, 151, 181, 0.2);
    color: var(--text-muted);
}

.feature-card h3,
.feature-card p {
    padding: 0 2rem;
}

.feature-card .feature-link {
    display: block;
    padding: 0 2rem 2rem;
}

.coming-soon {
    opacity: 0.7;
    position: relative;
}

.coming-soon .card-header,
.upcoming .card-header {
    background: linear-gradient(140deg, rgba(203, 213, 225, 0.15), rgba(34, 51, 82, 0.6));
}

.locked .card-header {
    background: linear-gradient(140deg, rgba(100, 116, 139, 0.2), rgba(34, 51, 82, 0.5));
}

.feature-link.disabled {
    color: var(--text-muted);
    cursor: not-allowed;
    text-decoration: none;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.feature-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.feature-link:hover {
    color: var(--accent-color);
}

.footer {
    background: var(--bg-secondary);
    color: var(--text-primary);
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
        padding: 0 1rem;
    }
    
    .nav-logo {
        width: 100%;
        justify-content: center;
    }
    
    .nav-logo h1 {
        font-size: 1.25rem;
    }
    
    .year-badge {
        font-size: 0.75rem;
        padding: 0.2rem 0.4rem;
    }
    
    .nav-links {
        width: 100%;
        justify-content: center;
        gap: 0.75rem;
        flex-wrap: wrap;
    }
    
    .nav-link {
        font-size: 0.875rem;
        padding: 0.5rem 0.75rem;
        background: var(--bg-card);
        border-radius: var(--border-radius-small);
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero-content {
        padding: 0 1.5rem;
    }
    
    .hero-title {
        font-size: 1.75rem;
        line-height: 1.2;
    }
    
    .hero-competition {
        font-size: 1.1rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    
    .btn-primary, .btn-secondary {
        padding: 0.875rem 1.5rem;
        text-align: center;
    }
    
    .features {
        padding: 2rem 0;
    }
    
    .features-container {
        padding: 0 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
        margin-bottom: 2rem;
    }
    
    .timeline-progress {
        margin-bottom: 3rem;
    }
    
    .stage-label {
        font-size: 0.75rem;
    }
    
    .round-section {
        margin-bottom: 3rem;
    }
    
    .round-title {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .round-number,
    .round-name {
        font-size: 1.5rem;
    }
    
    .round-subtitle {
        margin-left: 0;
        font-size: 0.875rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .card-header {
        padding: 0.875rem 1.25rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .card-date {
        padding: 0 1.25rem;
        font-size: 0.8rem;
    }
    
    .feature-card h3,
    .feature-card p,
    .feature-card .feature-link {
        padding-left: 1.25rem;
        padding-right: 1.25rem;
    }
    
    .feature-card h3 {
        font-size: 1.25rem;
    }
    
    .footer {
        margin-top: 2rem;
        padding: 1.5rem 0;
    }
    
    .footer-content {
        padding: 0 1rem;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }
    
    .hero-competition {
        font-size: 1rem;
    }
    
    .hero-subtitle {
        font-size: 0.9rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .nav-logo h1 {
        font-size: 1.1rem;
    }
    
    .timeline-progress {
        margin-bottom: 2rem;
    }
    
    .progress-stages {
        padding: 0 0.5rem;
    }
    
    .stage-dot {
        width: 12px;
        height: 12px;
        border-width: 2px;
    }
    
    .stage-label {
        font-size: 0.7rem;
    }
    
    .round-number,
    .round-name {
        font-size: 1.25rem;
    }
    
    .round-subtitle {
        font-size: 0.8rem;
    }
    
    .card-header {
        padding: 0.75rem 1rem;
    }
    
    .status-badge {
        font-size: 0.7rem;
        padding: 0.2rem 0.6rem;
    }
    
    .card-date {
        padding: 0 1rem;
        font-size: 0.75rem;
    }
    
    .feature-card h3,
    .feature-card p,
    .feature-card .feature-link {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}