/* ── TraceBar — shared styles ── */

:root {
    --bg: #0a0a0a;
    --bg-alt: #141414;
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #2997ff;
    --accent-hover: #4dacff;
    --card-bg: #1c1c1e;
    --card-border: rgba(255, 255, 255, 0.08);
    --nav-bg: rgba(10, 10, 10, 0.82);
    --divider: rgba(255, 255, 255, 0.08);
}

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

/* ── Body ── */
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Nav ── */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    background: var(--nav-bg);
    border-bottom: 1px solid var(--divider);
}

.site-nav .nav-inner {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 24px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-nav .nav-brand {
    font-size: 1rem;
    font-weight: 600;
    color: var(--fg);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.site-nav .nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.site-nav .nav-links a {
    font-size: 0.85rem;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* ── Container ── */
.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ── Typography ── */
h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

h2 {
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

h3 {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.3;
}

/* ── Links ── */
a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 980px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: background 0.2s, transform 0.1s;
    cursor: pointer;
    border: none;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--fg);
    border: 1px solid var(--card-border);
}

.btn-secondary:hover {
    background: var(--divider);
}

/* ── Cards ── */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 28px;
}

/* ── Footer ── */
.site-footer {
    border-top: 1px solid var(--divider);
    padding: 32px 24px;
    text-align: center;
}

.site-footer .footer-inner {
    max-width: 980px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--muted);
}

.site-footer .footer-links {
    display: flex;
    gap: 20px;
    list-style: none;
}

.site-footer .footer-links a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.8rem;
}

.site-footer .footer-links a:hover {
    color: var(--fg);
}

/* ── Utility ── */
.text-muted { color: var(--muted); }
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-6 { margin-top: 48px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-6 { margin-bottom: 48px; }

/* ── Responsive ── */
@media (max-width: 600px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.4rem; }

    .site-footer .footer-inner {
        flex-direction: column;
        gap: 12px;
    }
}