/* ===========================
   Design Tokens
   =========================== */
:root {
    --color-bg: #0D0D0D;
    --color-surface: #1A1A1A;
    --color-text: #E8E4DF;
    --color-text-muted: #8A8580;
    --color-accent: #D4A853;
    --color-accent-hover: #E0B86A;
    --color-code: #7B9EB8;
    --color-border: #2A2A2A;
    --color-border-hover: #3A3A3A;
    --color-success: #6BA368;
    --color-gold: #D4A853;
    --color-silver: #A8A8A8;
    --color-bronze: #C17B5E;

    --font-heading: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', monospace;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    --space-section: clamp(4rem, 8vw, 7rem);

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    --transition-fast: 150ms ease;
    --transition: 200ms ease;
    --max-width: 960px;
}

/* ===========================
   Reset
   =========================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover { color: var(--color-accent-hover); }

/* ===========================
   Layout
   =========================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ===========================
   Nav
   =========================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 13, 13, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}
.nav-logo:hover { color: var(--color-text); }
.logo-dot { color: var(--color-accent); }

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    font-family: var(--font-heading);
    font-size: 0.85rem;
}
.nav-links a { color: var(--color-text-muted); }
.nav-links a:hover { color: var(--color-text); }

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-outline {
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text);
}
.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ===========================
   Hero
   =========================== */
.hero {
    padding: var(--space-3xl) 0 var(--space-2xl);
    text-align: center;
}

.hero-badge {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-weight: 600;
    line-height: 1.15;
    margin-bottom: var(--space-xl);
}

.hero-cost {
    font-family: var(--font-mono);
    font-size: clamp(5rem, 15vw, 10rem);
    font-weight: 700;
    color: #E05252;
    line-height: 1;
    margin-bottom: var(--space-2xl);
    letter-spacing: -0.03em;
}

/* ===========================
   Leaderboard
   =========================== */
.leaderboard-section {
    padding: 0 0 var(--space-section);
}

.leaderboard-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.leaderboard-header h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
}

.refresh-note {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
}

.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.leaderboard-table thead {
    background: rgba(255, 255, 255, 0.03);
}

.leaderboard-table th {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    white-space: nowrap;
    border-bottom: 1px solid var(--color-border);
}

.leaderboard-table td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.leaderboard-table tbody tr:last-child td {
    border-bottom: none;
}

.leaderboard-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.col-rank { width: 48px; text-align: center; }
.col-tier { width: 80px; }
.col-cost, .col-tokens, .col-sessions, .col-messages { text-align: right; }

.tier-badge {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 0.15em 0.5em;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    white-space: nowrap;
}
.tier-max { color: var(--color-accent); border-color: rgba(212, 168, 83, 0.3); }
.tier-pro { color: var(--color-code); border-color: rgba(123, 158, 184, 0.3); }

.rank-medal {
    font-size: 1rem;
    display: inline-block;
    width: 24px;
    text-align: center;
}

.rank-1 { color: var(--color-gold); font-weight: 700; }
.rank-2 { color: var(--color-silver); font-weight: 600; }
.rank-3 { color: var(--color-bronze); font-weight: 600; }

.name-cell { font-family: var(--font-heading); font-weight: 500; }

.cost-value {
    color: var(--color-accent);
    font-weight: 500;
}

.loading, .empty-state {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--space-2xl) var(--space-md);
    font-family: var(--font-body);
}

/* ===========================
   Join
   =========================== */
.join-section {
    padding: var(--space-section) 0;
    border-top: 1px solid var(--color-border);
}

.join-section h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.join-sub {
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.install-steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.install-step {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.step-label {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.code-block {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-code);
    overflow-x: auto;
}

.copy-btn {
    flex-shrink: 0;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
}
.copy-btn:hover { color: var(--color-accent); }
.copy-btn.copied { color: var(--color-success); }

.step-note {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

.code-inline {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--color-code);
    background: var(--color-bg);
    padding: 0.1em 0.4em;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

/* ===========================
   Footer
   =========================== */
.site-footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 640px) {
    .nav-links { display: none; }
    .col-since, .col-updated, .col-tier { display: none; }
    .leaderboard-table { font-size: 0.78rem; }
    .leaderboard-table th, .leaderboard-table td {
        padding: var(--space-xs) var(--space-sm);
    }
}