/* ── LDP Protocol — Site Styles ──────────────────────────────────── */

:root {
  --text: #111;
  --muted: #555;
  --light: #888;
  --border: #ddd;
  --bg: #fafafa;
  --surface: #fff;
  --accent: #3d6b7e;
  --accent-soft: #e8f0f3;
  --code-bg: #f4f4f4;
  --max: 720px;
  --max-wide: 960px;
  --body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", "Fira Code", monospace;
  --heading: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ── Reset & Base ────────────────────────────────────────────────── */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

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

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

img { max-width: 100%; display: block; }

/* ── Layout ──────────────────────────────────────────────────────── */

.wrap {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 24px;
}

.wrap--narrow {
  max-width: var(--max);
}

.section {
  padding: 80px 0;
}

.section--alt {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ── Navigation ──────────────────────────────────────────────────── */

.nav {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

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

.nav__brand {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

.nav__brand:hover { text-decoration: none; }

.nav__links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav__links a {
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.nav__links a:hover { color: var(--text); text-decoration: none; }

/* ── Hero ────────────────────────────────────────────────────────── */

.hero {
  padding: 100px 0 80px;
  text-align: center;
}

.hero__badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 24px;
  letter-spacing: 0.03em;
}

.hero h1 {
  font-family: var(--heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero__sub {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.15s;
  border: 1px solid transparent;
}

.btn--primary {
  background: var(--text);
  color: var(--surface);
}

.btn--primary:hover { background: #333; text-decoration: none; }

.btn--secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn--secondary:hover { border-color: var(--text); text-decoration: none; }

.btn code {
  font-family: var(--mono);
  font-size: 0.85rem;
}

/* ── Install bar ─────────────────────────────────────────────────── */

.install {
  font-family: var(--mono);
  font-size: 0.9rem;
  background: var(--text);
  color: #ccc;
  padding: 12px 24px;
  border-radius: 8px;
  display: inline-block;
  margin-top: 12px;
}

.install strong { color: #fff; }

/* ── Stack diagram ───────────────────────────────────────────────── */

.stack {
  display: flex;
  justify-content: center;
  padding: 48px 0;
}

.stack svg {
  max-width: 520px;
  width: 100%;
}

/* ── Features ────────────────────────────────────────────────────── */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.feature {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.feature__icon {
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
}

.feature h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.feature p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Demo output ─────────────────────────────────────────────────── */

.demo {
  background: var(--text);
  color: #b0b0b0;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.65;
  padding: 32px;
  border-radius: 10px;
  overflow-x: auto;
  margin-top: 32px;
}

.demo pre {
  margin: 0;
  padding: 0;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  background: none;
  border: none;
  white-space: pre;
  overflow-x: auto;
}

.demo .h { color: #fff; font-weight: 600; }
.demo .g { color: #6ab04c; }
.demo .r { color: #eb4d4b; }
.demo .b { color: #7ec8e3; }
.demo .y { color: #f0c040; }
.demo .d { color: #666; }

/* ── Section headers ─────────────────────────────────────────────── */

.section__label {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.section h2 {
  font-family: var(--heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section__desc {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 560px;
  line-height: 1.6;
}

/* ── Code blocks ─────────────────────────────────────────────────── */

.code-block {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  overflow-x: auto;
  margin-top: 24px;
}

.code-block pre {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--text);
}

.code-block__label {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

/* ── Stats row ───────────────────────────────────────────────────── */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 24px;
  margin-top: 48px;
  text-align: center;
}

.stat__value {
  font-family: var(--heading);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

.stat__label {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 4px;
}

.stat__method {
  font-size: 0.68rem;
  color: var(--light);
  margin-top: 6px;
  font-style: italic;
}

.stat__method a {
  color: var(--light);
  text-decoration: underline;
}

/* ── CTA ─────────────────────────────────────────────────────────── */

.cta {
  text-align: center;
  padding: 80px 0;
}

.cta h2 {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.cta p {
  color: var(--muted);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

/* ── Footer ──────────────────────────────────────────────────────── */

.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--light);
}

.footer a { color: var(--muted); }

.footer__links {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 16px;
  list-style: none;
}

/* ── Responsive ──────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .hero { padding: 60px 0 48px; }
  .section { padding: 56px 0; }
  .features { grid-template-columns: 1fr; }
  .nav__links { gap: 16px; }
  .demo { font-size: 0.7rem; padding: 20px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; align-items: center; }
  .nav__links { display: none; }
}