/* ==== Shared design tokens & primitives for crossling.tech ==== */
:root {
    --bg: #0a0d14;
    --bg-alt: #10141d;
    --bg-card: rgba(255,255,255,0.03);
    --bg-card-hover: rgba(255,255,255,0.06);
    --border: rgba(255,255,255,0.08);
    --border-strong: rgba(255,255,255,0.16);
    --text: #c9d3e0;
    --text-dim: #7a8699;
    --text-bright: #f2f5f9;
    --accent: #8c7cff;
    --accent-dim: #5f52c9;
    --accent-teal: #4fd8b0;
    --mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    --sans: 'Inter', 'Segoe UI', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    line-height: 1.7;
    overflow-x: hidden;
}

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

::selection { background: var(--accent-dim); color: #fff; }

.wrap { max-width: 980px; margin: 0 auto; padding: 0 24px; }

/* --- Nav --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10,13,20,0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.site-nav {
    max-width: 980px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.site-logo {
    font-family: var(--sans);
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-bright);
    letter-spacing: 0.2px;
}
.site-logo span { color: var(--accent); }
.site-links { display: flex; align-items: center; gap: 28px; }
.site-links a {
    font-size: 0.9rem;
    color: var(--text-dim);
    font-weight: 500;
}
.site-links a:hover, .site-links a.active { color: var(--text-bright); }
.site-links a.cta {
    color: var(--bg);
    background: var(--accent);
    padding: 8px 16px;
    border-radius: 6px;
    font-family: var(--mono);
    font-size: 0.82rem;
}
.site-links a.cta:hover { background: var(--text-bright); color: var(--bg); }
.nav-toggle { display: none; }

@media (max-width: 640px) {
    .site-links { gap: 16px; }
    .site-links a:not(.cta) { display: none; }
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--mono);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 12px 22px;
    border-radius: 6px;
    border: 1px solid var(--border-strong);
    color: var(--text-bright);
    background: transparent;
    transition: border-color 0.2s, background 0.2s, transform 0.15s;
}
.btn:hover { border-color: var(--accent); color: var(--text-bright); transform: translateY(-1px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #06070b; }
.btn-primary:hover { background: var(--accent-dim); border-color: var(--accent-dim); color: #fff; }

/* --- Section heading --- */
.eyebrow {
    font-family: var(--sans);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.4px;
    margin-bottom: 10px;
}

h2.section-title {
    font-size: clamp(1.6rem, 4vw, 2.1rem);
    color: var(--text-bright);
    font-weight: 700;
    margin-bottom: 36px;
}

/* --- Tags/pills --- */
.tag {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--accent-teal);
    background: rgba(79,216,176,0.1);
    border: 1px solid rgba(79,216,176,0.25);
    padding: 4px 10px;
    border-radius: 20px;
    white-space: nowrap;
}

/* --- Footer --- */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 40px 0;
    margin-top: 40px;
}
.site-footer .wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}
.site-footer p { color: var(--text-dim); font-size: 0.85rem; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-dim); font-size: 0.85rem; }
.footer-links a:hover { color: var(--accent); }

@media (max-width: 640px) {
    .site-footer .wrap { flex-direction: column; text-align: center; }
}

/* --- Shared background particle canvas --- */
#bg-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    opacity: 0.55;
}