/* DevArch — Shared Styles
   Dark mode default, light mode via prefers-color-scheme */

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

:root {
  --bg: #0d1117;
  --bg-raised: #161b22;
  --bg-card: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --green: #3fb950;
  --orange: #d29922;
  --orange-soft: rgba(210, 153, 34, 0.08);
  --purple: #bc8cff;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", Menlo, Consolas, monospace;
  --max-width: 1080px;
  --nav-bg: rgba(13, 17, 23, 0.85);
}

/* Light mode — OS preference or manual toggle */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #ffffff;
    --bg-raised: #f6f8fa;
    --bg-card: #f6f8fa;
    --border: #d0d7de;
    --text: #1f2328;
    --text-muted: #656d76;
    --accent: #0969da;
    --accent-hover: #0550ae;
    --green: #1a7f37;
    --orange: #9a6700;
    --orange-soft: rgba(154, 103, 0, 0.06);
    --purple: #8250df;
    --nav-bg: rgba(255, 255, 255, 0.85);
  }
}
/* Manual light override */
:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-raised: #f6f8fa;
  --bg-card: #f6f8fa;
  --border: #d0d7de;
  --text: #1f2328;
  --text-muted: #656d76;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --green: #1a7f37;
  --orange: #9a6700;
  --orange-soft: rgba(154, 103, 0, 0.06);
  --purple: #8250df;
  --nav-bg: rgba(255, 255, 255, 0.85);
}
/* Manual dark override */
:root[data-theme="dark"] {
  --bg: #0d1117;
  --bg-raised: #161b22;
  --bg-card: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --green: #3fb950;
  --orange: #d29922;
  --orange-soft: rgba(210, 153, 34, 0.08);
  --purple: #bc8cff;
  --nav-bg: rgba(13, 17, 23, 0.85);
}

html:focus-within { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

.container { max-width: var(--max-width); margin: 0 auto; }

/* ── Nav ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
}
nav .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
nav .logo {
  font-family: var(--font-mono); font-weight: 700; font-size: 1.1rem;
  color: var(--text); letter-spacing: -0.02em; text-decoration: none;
}
nav .logo span { color: var(--accent); }
nav ul { list-style: none; display: flex; gap: 1.5rem; }
nav ul a { color: var(--text-muted); font-size: 0.875rem; }
nav ul a:hover { color: var(--text); }
.nav-toggle {
  display: none; background: none; border: none;
  color: var(--text-muted); font-size: 1.5rem; cursor: pointer; padding: 0.25rem;
}
.theme-toggle {
  background: none; border: 1px solid var(--border); border-radius: 6px;
  color: var(--text-muted); font-size: 1rem; cursor: pointer;
  padding: 0.25rem 0.5rem; line-height: 1;
  transition: border-color 0.15s, color 0.15s;
}
.theme-toggle:hover { border-color: var(--text-muted); color: var(--text); }

/* ── ASCII Banner ── */
.ascii-banner {
  padding: 8rem 1.5rem 0;
  text-align: center;
  overflow-x: auto;
}
.ascii-banner pre {
  font-family: var(--font-mono);
  font-size: clamp(0.45rem, 1.4vw, 0.95rem);
  line-height: 1.2;
  color: var(--orange);
  display: inline-block;
  text-align: left;
}
.ascii-banner .version {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ── Sections ── */
section { padding: 3rem 1.5rem; }
section h2 {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.section-sub {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
  max-width: 700px;
}

/* ── Hero ── */
.hero {
  padding: 2rem 1.5rem 1.5rem;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.75rem, 4.5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}
.hero h1 em {
  font-style: normal;
  color: var(--orange);
}
.hero p {
  color: var(--text-muted);
  font-size: clamp(1rem, 2vw, 1.15rem);
  max-width: 680px;
  margin: 0 auto;
}

/* ── Cards ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: border-color 0.15s;
}
.card:hover { border-color: var(--orange); }
.card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}
.card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}
.card-gold {
  border-color: var(--orange);
  background: var(--orange-soft);
}
.card-gold h3 { color: var(--orange); }

/* ── Evidence / Stats ── */
.evidence-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  text-align: center;
}
.stat-card .stat-value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: var(--orange);
}
.stat-card .stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ── Sequence Diagram ── */
.sequence-container {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}
.sequence-container pre {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-muted);
  white-space: pre;
}
.sequence-container .s-actor { color: var(--accent); font-weight: 600; }
.sequence-container .s-action { color: var(--text); }
.sequence-container .s-hook { color: var(--green); }
.sequence-container .s-agent { color: var(--purple); }
.sequence-container .s-gate { color: var(--orange); }

/* ── Pricing ── */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
}
.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: border-color 0.15s;
}
.price-card:hover { border-color: var(--orange); }
.price-card .price-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}
.price-card h3 { font-size: 1.1rem; margin-bottom: 0.25rem; }
.price-card .price {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.1rem;
}
.price-card .price-sub {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
}
.price-card .price-detail {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.5;
}
.price-card-trial {
  border-color: var(--green);
}
.price-card-trial .price-label { color: var(--green); }

/* ── Contact Form ── */
.contact-form {
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.contact-form label {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  display: block;
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}
.contact-form textarea { min-height: 100px; resize: vertical; }
.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.65rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s;
  align-self: flex-start;
}
.btn:hover { background: var(--accent-hover); }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.825rem;
}
footer a { color: var(--text-muted); }
footer a:hover { color: var(--text); }

/* ── Mobile ── */
@media (max-width: 700px) {
  .nav-toggle { display: block; }
  nav ul {
    display: none; flex-direction: column;
    position: absolute; top: 56px; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem; gap: 0.75rem;
  }
  nav ul.open { display: flex; }
  .card-grid { grid-template-columns: 1fr; }
  .evidence-grid { grid-template-columns: 1fr 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
}