:root {
    --bg: #0a0a0f;
    --surface: #12121a;
    --surface2: #1a1a2e;
    --border: #2a2a3e;
    --text: #e0e0e8;
    --text-dim: #8888a0;
    --accent: #6c5ce7;
    --accent-glow: rgba(108, 92, 231, 0.3);
    --green: #00e676;
    --orange: #ff9100;
    --red: #ff1744;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', monospace;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { font-weight: 700; font-size: 1.1rem; color: var(--accent); }

.nav-links { display: flex; gap: 1.5rem; }

.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    background: radial-gradient(ellipse at center, var(--surface2) 0%, var(--bg) 70%);
}

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

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent), #a29bfe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-dim);
    margin-bottom: 3rem;
}

.hero-info {
    display: flex;
    justify-content: center;
    gap: 3rem;
}

.stat { text-align: center; }

.stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    font-family: var(--mono);
    color: var(--accent);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section {
    padding: 5rem 2rem;
}

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

.section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--accent);
}

.card p { color: var(--text-dim); font-size: 0.95rem; }

.loading {
    text-align: center;
    color: var(--text-dim);
    padding: 3rem;
    font-family: var(--mono);
    font-size: 0.9rem;
}

.task-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    border-left: 3px solid var(--accent);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.task-id {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--accent);
    background: var(--surface2);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
}

.task-date {
    font-size: 0.8rem;
    color: var(--text-dim);
}

.task-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.task-difficulty {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.difficulty-hard {
    background: rgba(255, 17, 68, 0.15);
    color: var(--red);
}

.difficulty-insane {
    background: rgba(108, 92, 231, 0.15);
    color: var(--accent);
}

.difficulty-medium {
    background: rgba(255, 145, 0, 0.15);
    color: var(--orange);
}

.task-description {
    color: var(--text-dim);
    font-size: 0.95rem;
    line-height: 1.7;
    white-space: pre-wrap;
}

.task-expected {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--surface2);
    border-radius: 8px;
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--text-dim);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

th {
    color: var(--text-dim);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

td { color: var(--text); }

.vm-info {
    background: var(--surface2);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
}

.vm-info code {
    font-family: var(--mono);
    font-size: 1rem;
    color: var(--accent);
}

.vm-note {
    font-size: 0.85rem;
    color: var(--text-dim);
    margin-top: 0.75rem;
}

pre {
    background: var(--surface2);
    padding: 1.25rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 0.5rem 0;
}

pre code {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--text);
    line-height: 1.5;
}

footer {
    border-top: 1px solid var(--border);
    padding: 3rem 2rem;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.9rem;
}

.footer-small {
    font-size: 0.75rem;
    margin-top: 0.5rem;
    color: #555;
}

@media (max-width: 600px) {
    .hero h1 { font-size: 2rem; }
    .hero-info { flex-direction: column; gap: 1.5rem; }
    .nav-links { display: none; }
}