/* FerroTERM landing page: design tokens and layout.
   Self-contained: system font stack, no external assets, light and dark via
   prefers-color-scheme. Relative URLs only. */

:root {
  /* brand */
  --nt-teal: #0e7c86;
  --nt-teal-600: #0a626b;
  --nt-teal-050: #e7f4f5;
  /* light theme */
  --nt-bg: #ffffff;
  --nt-surface: #f5f8f8;
  --nt-text: #131a1b;
  --nt-muted: #5a6768;
  --nt-border: #dde6e6;
  --nt-shadow: 0 1px 2px rgba(19, 26, 27, 0.06), 0 8px 24px rgba(19, 26, 27, 0.06);
  /* fonts */
  --nt-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --nt-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  /* layout */
  --nt-max: 1080px;
  --nt-radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --nt-bg: #0c1213;
    --nt-surface: #141c1d;
    --nt-text: #eef4f4;
    --nt-muted: #a2b0b0;
    --nt-border: #253032;
    --nt-teal: #2bb6c2;
    --nt-teal-600: #4fc9d3;
    --nt-teal-050: #142023;
    --nt-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--nt-sans);
  color: var(--nt-text);
  background: var(--nt-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--nt-teal); text-decoration: none; }
a:hover { color: var(--nt-teal-600); text-decoration: underline; }

img, svg { max-width: 100%; height: auto; }

code {
  font-family: var(--nt-mono);
  font-size: 0.88em;
  background: var(--nt-teal-050);
  padding: 0.1em 0.35em;
  border-radius: 5px;
}

.wrap {
  width: 100%;
  max-width: var(--nt-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(12px);
  background: color-mix(in srgb, var(--nt-bg) 82%, transparent);
  border-bottom: 1px solid var(--nt-border);
}
.nav .wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  color: var(--nt-text);
}
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; }
.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  font-weight: 600;
  font-size: 0.95rem;
}
.nav-links a { color: var(--nt-muted); }
.nav-links a:hover { color: var(--nt-teal); text-decoration: none; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 1.25rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 1rem;
  border: 1.5px solid transparent;
  transition: transform 0.06s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--nt-teal); color: #fff; }
.btn-primary:hover { background: var(--nt-teal-600); color: #fff; }
.btn-ghost { border-color: var(--nt-border); color: var(--nt-text); background: var(--nt-surface); }
.btn-ghost:hover { border-color: var(--nt-teal); color: var(--nt-teal); }

/* Hero */
.hero {
  position: relative;
  padding: clamp(3rem, 8vw, 5.5rem) 0 clamp(2.5rem, 6vw, 4rem);
  text-align: center;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 55% at 50% 0%, color-mix(in srgb, var(--nt-teal) 16%, transparent), transparent 70%),
    linear-gradient(180deg, var(--nt-teal-050), transparent 42%);
  pointer-events: none;
}
.hero > * { position: relative; }
.hero-logo { width: 88px; height: 88px; margin: 0 auto 1.25rem; display: block; }
.status {
  display: inline-block;
  margin: 0 auto 1.25rem;
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  background: var(--nt-teal-050);
  border: 1px solid var(--nt-border);
  color: var(--nt-teal);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.hero h1 {
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  line-height: 1.2;
  margin: 0 auto 1rem;
  max-width: 22ch;
  letter-spacing: -0.01em;
}
.hero .sub {
  color: var(--nt-muted);
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  max-width: 60ch;
  margin: 0 auto 2rem;
}
.hero-cta { display: flex; gap: 0.85rem; justify-content: center; flex-wrap: wrap; }
.hero .note {
  margin: 1.5rem auto 0;
  max-width: 56ch;
  color: var(--nt-muted);
  font-size: 0.86rem;
}

/* Section scaffolding */
section { padding: clamp(3rem, 7vw, 4.5rem) 0; }
.surface { background: var(--nt-surface); border-block: 1px solid var(--nt-border); }
.section-head { text-align: center; max-width: 62ch; margin: 0 auto 2.5rem; }
.section-head h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin: 0 0 0.6rem;
  letter-spacing: -0.01em;
}
.section-head p { color: var(--nt-muted); margin: 0; font-size: 1.05rem; }
.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--nt-teal);
  margin-bottom: 0.5rem;
}

/* Why: comparison cards */
.compare {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.1rem;
  max-width: 780px;
  margin: 0 auto;
}
.compare-card {
  background: var(--nt-surface);
  border: 1px solid var(--nt-border);
  border-radius: var(--nt-radius);
  padding: 1.6rem;
  text-align: center;
}
.compare-card.accent {
  background: var(--nt-teal-050);
  border-color: color-mix(in srgb, var(--nt-teal) 45%, var(--nt-border));
}
.compare-card .tag {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--nt-muted);
  margin-bottom: 0.5rem;
}
.compare-card .big {
  font-size: clamp(1.7rem, 4.5vw, 2.4rem);
  font-weight: 800;
  line-height: 1.1;
  margin: 0 0 0.5rem;
  color: var(--nt-teal);
  font-variant-numeric: tabular-nums;
}
.compare-card .cap { margin: 0; color: var(--nt-muted); font-size: 0.92rem; }
.compare-note {
  max-width: 66ch;
  margin: 1.75rem auto 0;
  text-align: center;
  color: var(--nt-muted);
  font-size: 0.95rem;
}

/* Feature grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.1rem;
}
.card {
  background: var(--nt-bg);
  border: 1px solid var(--nt-border);
  border-radius: var(--nt-radius);
  padding: 1.5rem;
  transition: transform 0.1s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--nt-shadow);
  border-color: color-mix(in srgb, var(--nt-teal) 40%, var(--nt-border));
}
.card .ico {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: var(--nt-teal-050);
  color: var(--nt-teal);
  margin-bottom: 0.9rem;
}
.card .ico svg { width: 22px; height: 22px; }
.card h3 { margin: 0 0 0.4rem; font-size: 1.08rem; }
.card p { margin: 0; color: var(--nt-muted); font-size: 0.94rem; }
.card code { font-size: 0.85em; }

/* Status panel */
.status-panel {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  background: var(--nt-surface);
  border: 1px solid var(--nt-border);
  border-radius: var(--nt-radius);
  padding: clamp(1.75rem, 5vw, 2.75rem);
}
.status-panel h2 { margin: 0 0 0.75rem; font-size: clamp(1.3rem, 3vw, 1.8rem); }
.status-panel p { color: var(--nt-muted); margin: 0 auto 1rem; max-width: 60ch; }
.status-panel .hero-cta { margin-top: 1.5rem; }

/* Footer */
.footer {
  border-top: 1px solid var(--nt-border);
  background: var(--nt-surface);
  padding: 3rem 0 2.5rem;
  font-size: 0.92rem;
}
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: space-between;
  align-items: flex-start;
}
.footer-brand { max-width: 44ch; }
.footer-brand .brand { margin-bottom: 0.75rem; }
.footer-brand p { color: var(--nt-muted); margin: 0.35rem 0; }
.footer-links { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.footer-links ul { list-style: none; margin: 0; padding: 0; }
.footer-links h4 { margin: 0 0 0.6rem; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--nt-text); }
.footer-links li { margin: 0.35rem 0; }
.footer-links a { color: var(--nt-muted); }
.footer-links a:hover { color: var(--nt-teal); }
.footer-note {
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--nt-border);
  color: var(--nt-muted);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 720px) {
  .nav-links { gap: 1rem; font-size: 0.9rem; }
  .nav-links .hide-sm { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; transition: none !important; }
}