/* LangSyn — langsyn.net (Developer Ecology)
   Lead color: Blue (#4A7A9A)
   Dark mode — LANGSYN_DESIGN_SYSTEM.md
   Refactored: 2026-04-03 */

/* ─── Custom Properties ──────────────────────────────────────────────── */

:root {
  --red:        #C43020;
  --red-sharp:  #E24B3A;
  --blue:       #4A7A9A;
  --blue-sharp: #5E9AC0;
  --ochre:      #B89868;
  --ochre-sharp:#D4B080;
  --amber:      #D49030;
  --amber-sharp:#EFA527;

  --bg:         #0A0A0B;
  --bg-surface: #111113;
  --bg-raised:  #1A1A1D;
  --bg-hover:   #222226;

  --text:       #E8E4DE;
  --text-soft:  #9A9590;
  --text-muted: #5C5955;

  --border:     rgba(232, 228, 222, 0.08);
  --border-hover: rgba(232, 228, 222, 0.15);

  --lead:       #4A7A9A;
  --lead-light: #5E9AC0;

  --max-w:      960px;
}

*, *::before, *::after { box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body { margin: 0; font-family: 'IBM Plex Sans', sans-serif; background: var(--bg); color: var(--text); line-height: 1.7; }
a { color: var(--lead); text-decoration: none; }
a:hover { color: var(--lead-light); }
img { max-width: 100%; height: auto; }

/* ─── Language Toggle ───────────────────────────────────────────────── */
body:not(.lang-en) [lang="en"],
body.lang-en [lang="no"] {
  display: none;
}

.lang-switch { font-family: 'IBM Plex Mono', monospace; font-size: 0.75rem; letter-spacing: 0.1em; display: flex; border: 0.5px solid var(--border-hover); border-radius: 4px; overflow: hidden; }
.lang-switch button { background: none; border: none; color: var(--text-muted); padding: 0.3rem 0.6rem; cursor: pointer; font-family: inherit; font-size: inherit; letter-spacing: inherit; transition: background 0.15s, color 0.15s; }
.lang-switch button:first-child { border-right: 0.5px solid var(--border-hover); }
.lang-switch button.active { background: var(--bg-hover); color: var(--text); }

/* ─── Typography ─────────────────────────────────────────────────────── */
h1 { font-family: 'Instrument Sans', sans-serif; font-size: clamp(2.8rem, 5.5vw, 4.5rem); font-weight: 600; line-height: 1.12; letter-spacing: -0.025em; color: var(--text); margin: 0; }
h2 { font-family: 'Instrument Sans', sans-serif; font-size: clamp(2rem, 3.5vw, 3rem); font-weight: 600; line-height: 1.2; letter-spacing: -0.02em; color: var(--text); margin: 0; }
h3 { font-family: 'Instrument Sans', sans-serif; font-size: 1.35rem; font-weight: 500; letter-spacing: -0.01em; color: var(--text); margin: 0; }
h4 { font-family: 'Instrument Sans', sans-serif; font-size: 1.05rem; font-weight: 500; color: var(--text); margin: 0; }
p { font-size: 1rem; font-weight: 300; line-height: 1.8; color: var(--text-soft); margin: 0 0 1rem; }
p.lead { font-size: 1.15rem; max-width: 580px; }
.section-label { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.2em; color: var(--text-muted); }
code, .mono { font-family: 'IBM Plex Mono', monospace; font-size: 0.85em; }
em.lead-em { font-style: normal; color: var(--lead); }

/* ─── Layout ─────────────────────────────────────────────────────────── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 3rem; }

/* ─── Navigation ─────────────────────────────────────────────────────── */
body > nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; padding: 1.25rem 3rem; display: flex; align-items: center; justify-content: space-between; background: rgba(26, 26, 29, 0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 0.5px solid var(--border); }
.nav-brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--text); }
.nav-brand .mark { width: 32px; height: 32px; }
.nav-brand .wordmark { font-family: 'IBM Plex Sans', sans-serif; font-weight: 600; font-size: 1rem; letter-spacing: 0.04em; }
.nav-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-links a { font-size: 0.9rem; font-weight: 400; color: var(--text-soft); text-decoration: none; transition: color 0.15s; }
.nav-links a:hover { color: var(--text); }
.domain-link { font-family: 'IBM Plex Mono', monospace; font-size: 0.8rem !important; padding: 0.35rem 0.75rem; border: 0.5px solid var(--border-hover); border-radius: 4px; color: var(--text-muted) !important; transition: border-color 0.15s, color 0.15s; }
.domain-link:hover { border-color: var(--text-soft); color: var(--text) !important; }

/* ─── Hero ───────────────────────────────────────────────────────────── */
.hero { min-height: 100vh; display: flex; align-items: center; padding: 8rem 0 4rem; position: relative; overflow: hidden; }
.hero-content { position: relative; z-index: 1; }
.eyebrow { display: inline-flex; align-items: center; gap: 0.6rem; margin-bottom: 1.5rem; }
.eyebrow::before { content: ''; display: block; width: 24px; height: 2px; background: var(--lead); }
.eyebrow span { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.2em; color: var(--text-muted); }
.hero h1 { max-width: 720px; margin-bottom: 1.5rem; }
.hero h1 em { font-style: normal; color: var(--lead); }
.hero .lead { margin-bottom: 2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.badge-row { display: flex; gap: 0.75rem; margin-top: 1.5rem; flex-wrap: wrap; }
.badge { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; letter-spacing: 0.1em; color: var(--text-muted); padding: 0.35rem 0.75rem; border: 0.5px solid var(--border); border-radius: 4px; }

/* ─── Buttons ────────────────────────────────────────────────────────── */
.btn-primary { display: inline-flex; align-items: center; padding: 0.85rem 1.75rem; background: var(--lead); color: var(--bg); border-radius: 8px; font-size: 0.9rem; font-weight: 500; font-family: 'IBM Plex Sans', sans-serif; text-decoration: none; border: none; cursor: pointer; letter-spacing: 0.02em; transition: opacity 0.15s; }
.btn-primary:hover { opacity: 0.85; }
.btn-secondary { display: inline-flex; align-items: center; padding: 0.85rem 1.75rem; background: transparent; border: 0.5px solid var(--border-hover); border-radius: 8px; font-size: 0.9rem; font-weight: 400; font-family: 'IBM Plex Sans', sans-serif; color: var(--text); text-decoration: none; cursor: pointer; transition: background 0.15s; }
.btn-secondary:hover { background: var(--bg-hover); }

/* ─── Section Pattern ────────────────────────────────────────────────── */
.section { padding: 5rem 0; }
.section-label { margin-bottom: 0.75rem; }
.section-title { margin-bottom: 1rem; }
.section-intro { font-size: 1.15rem; max-width: 580px; margin-bottom: 3rem; }
.cream-section { background: var(--bg-surface); }

/* ─── Cards ──────────────────────────────────────────────────────────── */
.card { background: var(--bg-surface); border: 0.5px solid var(--border); border-radius: 12px; padding: 2.25rem; transition: border-color 0.2s, background 0.2s; }
.card:hover { border-color: var(--border-hover); background: var(--bg-raised); }
.card h3 { margin-bottom: 0.75rem; }
.card h4 { margin-bottom: 0.5rem; }
.card p { margin-bottom: 0.75rem; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.5rem; }
.arrow-link { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.9rem; font-weight: 500; color: var(--lead); transition: gap 0.2s; }
.arrow-link:hover { gap: 0.6rem; }

/* ─── Stack Diagram ─────────────────────────────────────────────────── */
.stack-diagram { background: var(--bg-raised); border: 0.5px solid var(--border); border-radius: 12px; padding: 2.5rem 2rem; max-width: 600px; margin: 2.5rem 0; }
.stack-title { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.15em; color: var(--text-muted); margin-bottom: 1.5rem; }
.stack-layer { display: flex; align-items: center; gap: 1rem; padding: 0.75rem 1rem; margin-bottom: 0.5rem; border-left: 3px solid var(--border); transition: border-color 0.2s; }
.stack-layer:hover { border-color: var(--lead); }
.stack-layer .dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.stack-layer .name { font-family: 'IBM Plex Sans', sans-serif; font-weight: 500; font-size: 0.95rem; color: var(--text); flex: 1; }
.stack-layer .desc { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; color: var(--text-muted); }
.stack-connector { font-family: 'IBM Plex Mono', monospace; font-size: 0.65rem; color: var(--text-muted); padding: 0.25rem 0 0.25rem 2.5rem; letter-spacing: 0.05em; }

/* ─── Library Cards ─────────────────────────────────────────────────── */
.lib-card { background: var(--bg-raised); border: 0.5px solid var(--border); border-radius: 12px; padding: 2rem; transition: border-color 0.2s; }
.lib-card:hover { border-color: var(--border-hover); }
.lib-card .lib-name { font-family: 'IBM Plex Mono', monospace; font-size: 1.05rem; font-weight: 500; color: var(--lead); margin-bottom: 0.5rem; }
.lib-card p { font-size: 0.95rem; margin-bottom: 0.75rem; }
.lib-meta { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; color: var(--text-muted); letter-spacing: 0.05em; }
.lib-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; margin-top: 2.5rem; }

/* ─── OID Section ────────────────────────────────────────────────────── */
.oid-highlight { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; margin-top: 2.5rem; }
.oid-stats { display: flex; gap: 2rem; }
.oid-stat { text-align: center; }
.oid-stat .number { font-family: 'Instrument Sans', sans-serif; font-size: 2.5rem; font-weight: 600; color: var(--lead); }
.oid-stat .label { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.15em; color: var(--text-muted); }

/* ─── Contributions ──────────────────────────────────────────────────── */
.contrib-item { padding: 1.5rem 0; border-bottom: 0.5px solid var(--border); }
.contrib-item:last-child { border-bottom: none; }
.contrib-item h4 { margin-bottom: 0.25rem; }
.contrib-item h4 a { color: var(--text); }
.contrib-item h4 a:hover { color: var(--lead); }
.contrib-item p { font-size: 0.95rem; margin-bottom: 0.5rem; }

/* ─── Footer ─────────────────────────────────────────────────────────── */
footer { background: var(--bg-raised); border-top: 0.5px solid var(--border); padding: 2rem 3rem; display: flex; align-items: center; justify-content: space-between; }
footer .tagline { font-family: 'Instrument Sans', sans-serif; font-style: italic; font-size: 1rem; color: var(--text-soft); }
footer .footer-links { display: flex; gap: 1.5rem; }
footer .footer-links a { font-size: 0.85rem; color: var(--text-muted); text-decoration: none; transition: color 0.15s; }
footer .footer-links a:hover { color: var(--text); }

/* ─── Scroll Reveal ──────────────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.5s ease-out, transform 0.5s ease-out; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ─── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 900px) { .container { padding: 0 1.5rem; } nav { padding: 1rem 1.5rem; } footer { padding: 1.5rem; } .oid-highlight { grid-template-columns: 1fr; } .nav-links .anchor-link { display: none; } }
@media (max-width: 600px) { .container { padding: 0 1.25rem; } nav { padding: 1rem 1.25rem; } .hero { min-height: auto; padding: 6rem 0 3rem; } .lib-grid { grid-template-columns: 1fr; } .card-grid { grid-template-columns: 1fr; } footer { flex-direction: column; text-align: center; gap: 1rem; } .domain-link { display: none; } }