/* ============================================================
   OpenHeatLoss — shared stylesheet
   Applies to all four marketing pages
   ============================================================ */

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

:root {
  --slate-950: #0a0f1a;
  --slate-900: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-400: #94a3b8;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --amber-400: #fbbf24;
  --amber-300: #fcd34d;
  --amber-200: #fde68a;
  --amber-500: #f59e0b;
  --teal-400: #2dd4bf;
  --teal-300: #5eead4;
  --white: #ffffff;

  --font-display: 'DM Serif Display', Georgia, serif;
  --font-mono: 'DM Mono', 'Courier New', monospace;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--slate-950);
  color: var(--slate-300);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  overflow-x: hidden;
}

/* ── NOISE TEXTURE OVERLAY ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 3rem 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 15, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.site-logo {
  width: 180px;
  height: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 400;
  color: var(--slate-400);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--white); }
.nav-links a.active { color: var(--amber-400); }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1.1rem;
  background: var(--amber-400);
  color: var(--slate-950) !important;
  font-weight: 500 !important;
  font-size: 14px !important;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
}
.nav-cta:hover { background: var(--amber-300); transform: translateY(-1px); }

/* ── SECTION SHARED ── */
section { position: relative; z-index: 1; }

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--amber-500);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 1rem;
}

h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--white);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
h2 em { font-style: italic; color: var(--amber-400); }

.section-intro {
  font-size: 1.05rem;
  color: var(--slate-400);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 3.5rem;
}

/* ── BUTTONS ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  background: var(--amber-400);
  color: var(--slate-950);
  font-weight: 500;
  font-size: 1rem;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}
.btn-primary:hover {
  background: var(--amber-300);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(251,191,36,0.2);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  background: transparent;
  color: var(--slate-300);
  font-size: 1rem;
  border: 1px solid var(--slate-700);
  border-radius: 8px;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}
.btn-secondary:hover { border-color: var(--slate-500); color: var(--white); }

/* ── TRUST BAR ── */
.trust-bar {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--slate-800);
  border-bottom: 1px solid var(--slate-800);
  padding: 1.2rem 2rem;
  background: rgba(15,23,42,0.6);
}

.trust-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--slate-500);
  letter-spacing: 0.3px;
  white-space: nowrap;
}
.trust-item svg { color: var(--amber-400); flex-shrink: 0; }

/* ── HERO SHARED ── */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(251,191,36,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(251,191,36,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
}

.hero-eyebrow-pill {
  display: inline-block;
  padding: 0.25rem 0.7rem;
  background: rgba(251,191,36,0.08);
  border: 1px solid rgba(251,191,36,0.2);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber-300);
  letter-spacing: 0.5px;
  margin-bottom: 1.5rem;
}

/* ── OPEN SOURCE CODE BLOCK ── */
.open-code {
  background: var(--slate-950);
  border: 1px solid var(--slate-800);
  border-radius: 10px;
  overflow: hidden;
}

.open-code-header {
  padding: 0.7rem 1rem;
  background: var(--slate-800);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--slate-400);
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-r { background: #ff5f57; }
.dot-y { background: #febc2e; }
.dot-g { background: #28c840; }

.code-body {
  padding: 1.2rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.8;
  overflow-x: auto;
}

.c-comment { color: var(--slate-600); }
.c-key { color: var(--teal-300); }
.c-num { color: var(--amber-300); }
.c-str { color: #86efac; }
.c-fn { color: #c084fc; }

/* ── CTA SECTION ── */
#cta { border-top: 1px solid var(--slate-800); }

.cta-glow {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 600px; height: 300px;
  background: radial-gradient(ellipse, rgba(251,191,36,0.07) 0%, transparent 70%);
  pointer-events: none;
}

.cta-inner {
  max-width: 700px;
  margin: 0 auto;
  padding: 6rem 2rem;
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-inner h2 { margin-bottom: 1rem; }

.cta-sub {
  font-size: 1.05rem;
  color: var(--slate-400);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.cta-note {
  margin-top: 1.2rem;
  font-size: 0.8rem;
  color: var(--slate-600);
  font-family: var(--font-mono);
}

/* ── FOOTER ── */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--slate-800);
  padding: 2rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-left { display: flex; flex-direction: column; gap: 0.4rem; }
.footer-name { font-family: var(--font-mono); font-size: 13px; color: var(--white); }
.footer-sub { font-size: 12px; color: var(--slate-600); }

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  flex-wrap: wrap;
}
.footer-links a {
  font-size: 13px;
  color: var(--slate-500);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--slate-300); }

.footer-agpl {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--slate-700);
  color: var(--slate-500);
  border-radius: 4px;
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-eyebrow-pill { animation: fadeUp 0.7s ease 0.05s both; }
h1 { animation: fadeUp 0.7s ease 0.15s both; }
.hero-sub { animation: fadeUp 0.7s ease 0.25s both; }
.hero-ctas { animation: fadeUp 0.7s ease 0.35s both; }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .trust-inner { gap: 1.5rem; }
}

@media (max-width: 600px) {
  .trust-inner { gap: 1.2rem; }
}