/* ============================================================================
   PingPair website — "Signal Instrument" design system.

   PingPair is a LAN measurement tool, so the site reads like an instrument:
   a dark oscilloscope panel with a cyan signal traveling the Server↔Client
   link. The brand palette mirrors the app's Dark theme
   (pingpair/theme.py PALETTES["dark"]) and logo.svg so the site and the app
   read as one product.

     Slate   #0b1220 / #16213a / #1b2942
     Cyan    #22d3ee / #67e8f9 / #0891b2   (the one sharp accent)

   Typography: Inter (bundled — the same face the app ships) carries body/UI;
   a monospace stack carries the technical "readout" voice (eyebrows, metrics,
   version chips). No external CDNs — every asset is local.
   ========================================================================= */

/* ---- Bundled Inter (same face the app ships; no external CDN) ----
   Latin-subset WOFF2 (~39 KB/weight vs ~410 KB full TTF) built from the
   app's TTFs (Software/src/pingpair/resources/fonts/) via
   `python -m fontTools.subset … --flavor=woff2` — see site/README.md. */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("assets/fonts/Inter-Regular.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("assets/fonts/Inter-Medium.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("assets/fonts/Inter-SemiBold.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("assets/fonts/Inter-Bold.woff2") format("woff2");
}

/* ============================ Design tokens ============================== */
:root {
  /* Surfaces */
  --bg: #0b1220;
  --bg-soft: #0f172a;
  --surface: #16213a;
  --card: #1b2942;
  --card-2: #16223c;
  --border: #2a3a57;
  --border-strong: #4d6790;

  /* Ink */
  --text: #f1f5f9;
  --subtext: #94a3b8;
  --muted: #64748b;

  /* Cyan signal */
  --accent: #22d3ee;
  --accent-hover: #67e8f9;
  --accent-press: #0891b2;
  --accent-deep: #06b6d4;
  --link: #38bdf8;
  --on-accent: #06283a;

  /* Glow / shadow */
  --glow: rgba(34, 211, 238, 0.55);
  --shadow-lg: 0 30px 80px rgba(2, 6, 16, 0.6);
  --shadow-md: 0 18px 44px rgba(2, 6, 16, 0.45);

  /* Type */
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", "SF Mono",
    "Roboto Mono", Menlo, Consolas, monospace;

  /* Rhythm */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 22px;
  --maxw: 1140px;
  --gutter: 24px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --reveal-dur: 0.7s;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Instrument atmosphere: a fixed scope-graticule grid + two cyan phosphor
   glows, painted behind everything. Pointer-events off so it never blocks. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 560px at 82% -8%, rgba(34, 211, 238, 0.14), transparent 60%),
    radial-gradient(720px 520px at -6% 4%, rgba(8, 145, 178, 0.12), transparent 58%),
    var(--bg);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(80, 130, 180, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(80, 130, 180, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  background-position: center;
  -webkit-mask-image: radial-gradient(circle at 50% 22%, #000 0%, transparent 78%);
  mask-image: radial-gradient(circle at 50% 22%, #000 0%, transparent 78%);
}

a { color: var(--link); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--accent-hover); }

img { max-width: 100%; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

/* Monospace "instrument readout" eyebrow above section heads */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--glow);
  animation: blip 2.6s var(--ease) infinite;
}
@keyframes blip {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.5); }
  50% { box-shadow: 0 0 0 6px rgba(34, 211, 238, 0); }
}

/* ============================ Header / nav ============================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px) saturate(140%);
  background: rgba(11, 18, 32, 0.66);
  border-bottom: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.site-header.scrolled {
  background: rgba(9, 15, 27, 0.86);
  border-bottom-color: var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
}
.brand { display: flex; align-items: center; gap: 12px; font-size: 19px; letter-spacing: -0.01em; }
.brand img { width: 32px; height: 32px; display: block; filter: drop-shadow(0 0 10px rgba(34, 211, 238, 0.25)); }
.brand .word-ping { color: var(--text); font-weight: 700; }
.brand .word-pair { color: var(--accent); font-weight: 700; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--subtext); font-weight: 500; font-size: 14.5px; position: relative; }
.nav-links a:hover { color: var(--text); }
.nav-links a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.18s ease;
}
.nav-links a.is-active { color: var(--text); }
.nav-links a:not(.nav-cta).is-active::after { transform: scaleX(1); }
.nav-links a.nav-cta.is-active { border-color: var(--accent); background: rgba(34, 211, 238, 0.08); }
.nav-links a.nav-cta {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 8px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.nav-links a.nav-cta:hover { border-color: var(--accent); background: rgba(34, 211, 238, 0.08); color: var(--accent-hover); }

/* ============================== Buttons ================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease,
    box-shadow 0.2s ease, color 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--accent-hover), var(--accent));
  color: var(--on-accent);
  box-shadow: 0 10px 30px rgba(34, 211, 238, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
.btn-primary:hover {
  color: var(--on-accent);
  box-shadow: 0 14px 38px rgba(34, 211, 238, 0.36), inset 0 1px 0 rgba(255, 255, 255, 0.45);
}
.btn-ghost { background: rgba(255, 255, 255, 0.02); color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-hover); background: rgba(34, 211, 238, 0.06); }
.btn-lg { padding: 16px 28px; font-size: 16.5px; }

/* =============================== Hero ================================== */
/* scroll-margin > header height: the #home anchor jump clamps to scrollY 0. */
.hero { padding: 78px 0 26px; position: relative; scroll-margin-top: 100px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr 1.1fr;
  gap: 52px;
  align-items: center;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.32);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 24px;
}
.pill .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: #57c970;
  box-shadow: 0 0 8px #57c970;
}
.hero h1 {
  font-size: clamp(38px, 5.2vw, 60px);
  line-height: 1.04;
  margin: 0 0 20px;
  letter-spacing: -0.03em;
  font-weight: 700;
}
.hero h1 .accent {
  color: var(--accent);
  text-shadow: 0 0 34px rgba(34, 211, 238, 0.4);
}
.hero p.lead { font-size: clamp(17px, 1.5vw, 20px); color: var(--subtext); margin: 0 0 32px; max-width: 40ch; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-sub { margin-top: 18px; font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.02em; color: var(--muted); }
.hero-sub b { color: var(--subtext); font-weight: 600; }

/* The product screenshot, framed like an instrument readout with corner ticks */
.scope-frame { position: relative; }
.scope-frame::before,
.scope-frame::after {
  content: "";
  position: absolute;
  width: 18px; height: 18px;
  border: 2px solid var(--accent);
  opacity: 0.55;
}
.scope-frame::before { top: -8px; left: -8px; border-right: 0; border-bottom: 0; }
.scope-frame::after { bottom: -8px; right: -8px; border-left: 0; border-top: 0; }

.shot {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}
.shot-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 11px 14px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
}
.shot-bar i { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.shot-bar i:nth-child(1) { background: #ef5f5f; }
.shot-bar i:nth-child(2) { background: #f1c453; }
.shot-bar i:nth-child(3) { background: #57c970; }
.shot img { display: block; width: 100%; height: auto; }

/* ---- Signal-trace divider: the ping pulse traveling the link ---- */
.signal-divider {
  display: block;
  width: 100%;
  max-width: var(--maxw);
  margin: 8px auto 0;
  padding: 0 var(--gutter);
  height: 52px;
  overflow: visible;
}
.signal-divider svg { width: 100%; height: 100%; overflow: visible; display: block; }
.sig-base { stroke: var(--border-strong); stroke-width: 2; fill: none; opacity: 0.5; }
.sig-pulse {
  stroke: var(--accent);
  stroke-width: 2.5;
  fill: none;
  filter: drop-shadow(0 0 6px var(--glow));
  stroke-dasharray: 60 460;
  animation: trace 4s linear infinite;
}
.sig-node { fill: var(--accent-deep); }
@keyframes trace { to { stroke-dashoffset: -520; } }

/* ============================ Stats band =============================== */
.stats { padding: 30px 0; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(27, 41, 66, 0.6), rgba(22, 33, 58, 0.35));
  padding: 26px 28px;
}
.stat { text-align: center; position: relative; }
.stat + .stat::before {
  content: "";
  position: absolute;
  left: -9px; top: 14%;
  height: 72%;
  width: 1px;
  background: var(--border);
}
.stat .num {
  font-family: var(--mono);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.1;
}
.stat .num span { color: var(--accent); }
.stat .lbl { margin-top: 6px; font-size: 13px; color: var(--subtext); }

/* ========================= Section scaffolding ========================= */
section { padding: 64px 0; position: relative; }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 44px; }
.section-head .eyebrow { margin-bottom: 14px; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 34px); margin: 0 0 12px; letter-spacing: -0.02em; }
.section-head p { color: var(--subtext); font-size: 17px; margin: 0; }

/* ============================ Feature cards ============================ */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card {
  position: relative;
  background: linear-gradient(180deg, var(--card), var(--card-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
  overflow: hidden;
  transition: transform 0.25s var(--ease), border-color 0.25s ease, box-shadow 0.25s ease;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(420px 160px at 50% -30%, rgba(34, 211, 238, 0.12), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.card:hover { transform: translateY(-4px); border-color: var(--border-strong); box-shadow: var(--shadow-md); }
.card:hover::after { opacity: 1; }
.card .ico {
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  margin-bottom: 18px;
  font-size: 21px;
}
.card h3 { margin: 0 0 9px; font-size: 18px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--subtext); font-size: 15px; }
.card .tag {
  position: absolute;
  top: 18px; right: 18px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ========================== How it works ============================== */
.how { background: linear-gradient(180deg, transparent, rgba(15, 23, 42, 0.5)); }
.how-stage {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: rgba(11, 18, 32, 0.5);
  padding: 30px 28px 24px;
  margin-bottom: 36px;
  box-shadow: var(--shadow-md);
}
/* Animated topology: Server ◉ ╌╌pulse╌╌ ◉ Client */
.topo { width: 100%; height: auto; display: block; overflow: visible; }
.topo .wire { stroke: var(--border-strong); stroke-width: 2.5; fill: none; }
.topo .wave-base { stroke: rgba(34, 211, 238, 0.25); stroke-width: 3; fill: none; }
.topo .wave-pulse {
  stroke: var(--accent);
  stroke-width: 3.5;
  fill: none;
  stroke-linecap: round;
  filter: drop-shadow(0 0 7px var(--glow));
  stroke-dasharray: 48 320;
  animation: topoTrace 3.4s linear infinite;
}
@keyframes topoTrace { to { stroke-dashoffset: -368; } }
.topo .endpoint { fill: var(--accent-deep); }
.topo .endpoint-core { fill: #ecfeff; }
.topo .halo { fill: none; stroke: var(--accent); stroke-width: 2; opacity: 0; transform-origin: center; }
.topo .halo.server { animation: halo 3.4s ease-out infinite; }
.topo .halo.client { animation: halo 3.4s ease-out infinite 1.7s; }
@keyframes halo {
  0% { opacity: 0.7; r: 22px; }
  60%, 100% { opacity: 0; r: 40px; }
}
.topo text {
  font-family: var(--mono);
  font-size: 13px;
  fill: var(--subtext);
  letter-spacing: 0.04em;
}
.topo .ip { fill: var(--accent); }

.steps-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.flow-step {
  position: relative;
  padding: 22px 22px 22px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--card), var(--card-2));
}
.flow-step .idx {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}
.flow-step h3 { margin: 0 0 7px; font-size: 17px; }
.flow-step p { margin: 0; color: var(--subtext); font-size: 14.5px; }

/* ========================= Screenshot tour ============================ */
.theme-toggle {
  display: flex;
  width: max-content;
  gap: 4px;
  padding: 4px;
  margin: 0 auto 30px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.tt-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--subtext);
  font-family: var(--mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.06em;
  padding: 8px 22px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.tt-btn:hover { color: var(--text); }
.tt-btn.is-active { background: var(--accent); color: var(--on-accent); }
#screenshots .section-head { margin-bottom: 22px; }

.tour { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.tour figure { margin: 0; }
.tour .shot { box-shadow: var(--shadow-md); transition: transform 0.25s var(--ease), box-shadow 0.25s ease; }
.tour figure:hover .shot { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.tour figcaption {
  margin-top: 14px;
  text-align: center;
  color: var(--subtext);
  font-size: 13.5px;
}
.tour figcaption b { color: var(--text); font-weight: 600; }

/* Zoomable screenshot button — strip native chrome, reuse .shot frame */
button.shot {
  appearance: none;
  font: inherit;
  color: inherit;
  text-align: left;
  padding: 0;
  width: 100%;
  cursor: zoom-in;
  position: relative;
}
button.shot:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
button.shot::after {
  content: "⤢";
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: rgba(11, 18, 32, 0.72);
  border: 1px solid var(--border-strong);
  color: var(--accent);
  font-size: 16px;
  opacity: 0;
  transition: opacity 0.15s ease;
}
button.shot:hover::after, button.shot:focus-visible::after { opacity: 1; }

/* ====================== Sample report callout ========================= */
.sample {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
  margin-top: 42px;
  padding: 30px 34px;
  position: relative;
  background: linear-gradient(180deg, var(--card), var(--card-2));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.sample::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(600px 200px at 0% 0%, rgba(34, 211, 238, 0.1), transparent 60%);
  pointer-events: none;
}
.sample-text { max-width: 560px; position: relative; }
.sample-text h3 { margin: 0 0 9px; font-size: 21px; letter-spacing: -0.01em; }
.sample-text p { margin: 0; color: var(--subtext); font-size: 15px; }
.sample-note { margin-top: 9px !important; font-family: var(--mono); font-size: 12px !important; color: var(--muted); }
.sample-cta { display: flex; gap: 12px; flex-wrap: wrap; position: relative; }

/* ============================= Download =============================== */
.download { text-align: center; }
.dl-card {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  background: linear-gradient(180deg, var(--card), var(--card-2));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 40px 34px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.dl-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.45), transparent 40%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}
.dl-meta {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
  margin: 24px 0 6px;
  color: var(--subtext);
  font-size: 14.5px;
}
.dl-meta b { color: var(--text); font-weight: 600; font-family: var(--mono); }
.checksum {
  margin-top: 24px;
  text-align: left;
  background: #0a1019;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--subtext);
  word-break: break-all;
}
.checksum .lbl {
  color: var(--accent);
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.checksum #sha256 { color: var(--accent-hover); }
.verify-snip { margin-top: 16px; }
.checksum pre {
  margin: 6px 0 0;
  padding: 11px 13px;
  background: #070c14;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow-x: auto;
}
.checksum pre code { color: var(--text); font-size: 12.5px; }
.note { color: var(--subtext); font-size: 13px; margin-top: 20px; }

/* ============================ Trust strip ============================= */
.trust {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.55);
}
.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.trust .item { text-align: center; }
.trust .item .ico {
  width: 46px; height: 46px;
  margin: 0 auto 14px;
  display: grid; place-items: center;
  border-radius: 12px;
  font-size: 22px;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.26);
}
.trust .item h3 { margin: 0 0 7px; font-size: 17px; }
.trust .item p { margin: 0; color: var(--subtext); font-size: 14.5px; }

/* ============================== Footer =============================== */
.site-footer { padding: 44px 0 36px; border-top: 1px solid var(--border); color: var(--subtext); font-size: 14px; background: rgba(9, 14, 26, 0.6); }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-row .brand img { width: 24px; height: 24px; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-links a { color: var(--subtext); }
.footer-links a:hover { color: var(--text); }
.footer-ver { font-family: var(--mono); color: var(--muted); font-weight: 400; margin-left: 8px; font-size: 13px; }
.footer-fine { margin-top: 16px; font-size: 13px; color: var(--muted); }

/* ============================= Lightbox ============================== */
body.no-scroll { overflow: hidden; }
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 4vmin;
  background: rgba(5, 9, 17, 0.9);
  backdrop-filter: blur(5px);
  cursor: zoom-out;
}
.lightbox[hidden] { display: none; }
.lightbox img {
  max-width: 96vw;
  max-height: 92vh;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.65);
}
.lightbox-close {
  position: fixed;
  top: 18px;
  right: 22px;
  width: 44px;
  height: 44px;
  border-radius: 11px;
  border: 1px solid var(--border-strong);
  background: rgba(22, 33, 58, 0.92);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
}
.lightbox-close:hover { border-color: var(--accent); color: var(--accent-hover); }

/* ===================== Scroll-reveal (JS only) ======================= */
/* Without JS the .js class is absent, so content is fully visible. */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--reveal-dur) var(--ease), transform var(--reveal-dur) var(--ease);
  transition-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform;
}
.js [data-reveal].in { opacity: 1; transform: none; }

/* ==================== Docs / Changelog pages ========================= */
.doc-main { padding: 44px 0 72px; }
.doc-layout { display: grid; grid-template-columns: 232px 1fr; gap: 52px; align-items: start; }
.doc-toc {
  position: sticky;
  top: 88px;
  font-size: 14px;
  border-left: 1px solid var(--border);
  padding-left: 18px;
}
.doc-toc strong {
  display: block;
  color: var(--accent);
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.doc-toc a { display: block; color: var(--subtext); padding: 5px 0; font-family: var(--mono); font-size: 13px; }
.doc-toc a:hover { color: var(--accent-hover); }
.doc-body { max-width: 770px; min-width: 0; }
.doc-body > h1 { font-size: clamp(30px, 4vw, 40px); margin: 0 0 10px; letter-spacing: -0.02em; }
.doc-lead { color: var(--subtext); font-size: 18px; margin: 0 0 38px; }
.doc-body h2 {
  font-size: 23px;
  margin: 48px 0 16px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  scroll-margin-top: 88px;
  letter-spacing: -0.01em;
}
.doc-body h2 .sec-no {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  margin-right: 10px;
}
.doc-body h3 { font-size: 17px; margin: 28px 0 8px; }
.doc-body p, .doc-body li { color: #cbd5e1; font-size: 15.5px; }
.doc-body ul, .doc-body ol { padding-left: 22px; }
.doc-body li { margin: 6px 0; }
.doc-body a { color: var(--link); }
.doc-body strong { color: var(--text); }
.doc-body code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
  color: var(--accent-hover);
}
.doc-body pre {
  background: #070c14;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  overflow-x: auto;
  margin: 14px 0;
}
.doc-body pre code { background: none; border: 0; padding: 0; color: var(--text); font-size: 13px; line-height: 1.7; }
.doc-fig {
  margin: 24px 0;
  text-align: center;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(11, 18, 32, 0.5);
}
.doc-fig img {
  max-width: 100%;
  border-radius: 10px;
}
.doc-fig figcaption { margin-top: 12px; color: var(--subtext); font-size: 13.5px; }
.callout {
  border: 1px solid var(--border-strong);
  border-left: 3px solid var(--accent);
  background: rgba(34, 211, 238, 0.06);
  border-radius: var(--radius-sm);
  padding: 15px 18px;
  margin: 18px 0;
}
.callout p { margin: 0; }
.doc-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14.5px;
}
.doc-body th, .doc-body td {
  text-align: left;
  padding: 11px 14px;
  border: 1px solid var(--border);
  vertical-align: top;
}
.doc-body th {
  background: var(--bg-soft);
  color: var(--text);
  font-weight: 600;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.03em;
}
.doc-body td { color: #cbd5e1; }
.doc-body tbody tr:nth-child(even) td { background: rgba(255, 255, 255, 0.015); }
.doc-foot-note { margin-top: 44px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--subtext); }
.steps { counter-reset: step; list-style: none; padding-left: 0; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 44px;
  margin: 16px 0;
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 0;
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 9px;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.34);
  color: var(--accent);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 14px;
}

/* Page hero for docs/changelog (small banner under the nav) */
.page-hero { padding: 40px 0 8px; }
.page-hero .eyebrow { margin-bottom: 14px; }

/* Changelog */
.cl-release { margin: 0 0 44px; }
.cl-release h2 { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; border-top: 0; padding-top: 0; }
.cl-release h2 .ver { font-family: var(--mono); color: var(--accent); }
.cl-date { color: var(--subtext); font-size: 14px; font-weight: 400; font-family: var(--mono); }
.cl-tag { font-size: 11px; font-weight: 600; padding: 3px 10px; border-radius: 999px; letter-spacing: 0.04em; font-family: var(--mono); text-transform: uppercase; }
.cl-added    { background: rgba(87, 201, 112, 0.14); border: 1px solid rgba(87, 201, 112, 0.4); color: #86efac; }
.cl-changed  { background: rgba(241, 196, 83, 0.14); border: 1px solid rgba(241, 196, 83, 0.4); color: #fcd34d; }
.cl-fixed    { background: rgba(56, 189, 248, 0.14); border: 1px solid rgba(56, 189, 248, 0.4); color: #7dd3fc; }
.cl-security { background: rgba(239, 95, 95, 0.14);  border: 1px solid rgba(239, 95, 95, 0.4);  color: #fca5a5; }
.cl-group { margin: 16px 0; }
.cl-group h3 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--subtext); margin: 0 0 8px; font-family: var(--mono); }

/* =============================== 404 ================================= */
.notfound { text-align: center; padding: 110px 0; }
.notfound .glyph { font-family: var(--mono); font-size: clamp(72px, 14vw, 128px); margin: 0; color: var(--accent); letter-spacing: -0.04em; line-height: 1; text-shadow: 0 0 50px rgba(34, 211, 238, 0.4); }
.notfound p { color: var(--subtext); font-size: 18px; margin: 12px 0 30px; }

/* ========================= Reduced motion =========================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
}

/* =========================== Responsive ============================= */
@media (max-width: 980px) {
  .doc-layout { grid-template-columns: 1fr; gap: 22px; }
  .doc-toc { position: static; border-left: 0; border-bottom: 1px solid var(--border); padding: 0 0 16px; }
  .doc-toc a { display: inline-block; margin-right: 16px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 22px 18px; }
  .stat:nth-child(3)::before, .stat:nth-child(2)::before { display: none; }
}
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero { padding: 50px 0 18px; }
  .features, .tour, .trust-grid, .steps-flow { grid-template-columns: 1fr; }
  .nav-links { gap: 16px; }
  .nav-links a:not(.nav-cta) { display: none; }
}
@media (max-width: 560px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .sample { flex-direction: column; align-items: flex-start; }
}