/* ============================================================
   CIPHERION — Night-watch premium landing system
   Deep ink + signal amber · viewfinder framing · editorial serif
   ============================================================ */

:root {
  /* ---- Surfaces (deep ink) ---- */
  --ink-900: #06080B;
  --ink-850: #090C11;
  --ink-800: #0C1016;
  --ink-750: #10151C;
  --ink-700: #141A22;
  --ink-650: #1A222C;
  --ink-600: #222C38;

  /* ---- Hairlines ---- */
  --line: rgba(233, 238, 245, 0.08);
  --line-2: rgba(233, 238, 245, 0.14);
  --line-3: rgba(233, 238, 245, 0.22);

  /* ---- Text ---- */
  --text: #E9EDF2;
  --text-dim: #9DA7B2;
  --text-faint: #5E6873;
  --text-ghost: #3C454F;

  /* ---- Signal amber (accent) ---- */
  --amber: #F2A83C;
  --amber-bright: #FFBA52;
  --amber-deep: #C07C1F;
  --amber-glow: rgba(242, 168, 60, 0.16);
  --amber-line: rgba(242, 168, 60, 0.38);

  /* ---- Status ---- */
  --green: #5BD08C;
  --green-dim: rgba(91, 208, 140, 0.16);
  --red: #E5614B;

  /* ---- Type ---- */
  --serif: 'Newsreader', 'Noto Serif SC', Georgia, serif;
  --sans: 'Manrope', 'Noto Sans SC', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;

  /* ---- Layout ---- */
  --maxw: 1240px;
  --gutter: clamp(20px, 5vw, 80px);
  --radius: 4px;
}

/* Chinese-language adjustments: serif/sans swap to CJK families */
html[data-lang="zh"] {
  --serif: 'Noto Serif SC', 'Newsreader', serif;
  --sans: 'Noto Sans SC', 'Manrope', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Subtle global scanline + vignette texture overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background:
    repeating-linear-gradient(
      to bottom,
      rgba(255,255,255,0.013) 0px,
      rgba(255,255,255,0.013) 1px,
      transparent 1px,
      transparent 3px
    );
  opacity: var(--scanline-opacity, 1);
  mix-blend-mode: overlay;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background: radial-gradient(120% 90% at 50% 0%, transparent 40%, rgba(0,0,0,0.55) 100%);
}

/* Lang visibility — when not using data-attr swap, fallback */
html[data-lang="en"] .only-zh { display: none; }
html[data-lang="zh"] .only-en { display: none; }

::selection { background: var(--amber); color: var(--ink-900); }

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ============================================================
   Shared primitives
   ============================================================ */

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); min-width: 0; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--amber);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--amber-line);
}
html[data-lang="zh"] .eyebrow { letter-spacing: 0.18em; }

.section { position: relative; padding: clamp(80px, 11vh, 150px) 0; z-index: 2; }
.section--tight { padding: clamp(56px, 8vh, 100px) 0; }

h1, h2, h3 { font-weight: 400; line-height: 1.08; letter-spacing: -0.01em; }

.display {
  font-family: var(--serif);
  font-size: clamp(38px, 6.2vw, 84px);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: -0.02em;
}
html[data-lang="zh"] .display { font-weight: 500; line-height: 1.18; letter-spacing: 0; }

.h2 {
  font-family: var(--serif);
  font-size: clamp(30px, 4.4vw, 56px);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.015em;
}
html[data-lang="zh"] .h2 { font-weight: 500; line-height: 1.22; letter-spacing: 0; }

.lead {
  font-size: clamp(17px, 1.5vw, 21px);
  line-height: 1.6;
  color: var(--text-dim);
  max-width: 60ch;
}
.amber-text { color: var(--amber); }
.serif-em { font-family: var(--serif); font-style: italic; }
html[data-lang="zh"] .serif-em { font-style: normal; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 15px 26px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s cubic-bezier(.2,.7,.3,1), background .25s, border-color .25s, color .25s, box-shadow .25s;
  white-space: nowrap;
}
html[data-lang="zh"] .btn { font-family: var(--sans); letter-spacing: 0.04em; font-weight: 600; }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--amber);
  color: #1A1206;
  box-shadow: 0 0 0 0 var(--amber-glow);
}
.btn--primary:hover {
  background: var(--amber-bright);
  box-shadow: 0 14px 40px -12px rgba(242,168,60,0.6);
  transform: translateY(-2px);
}
.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line-2);
}
.btn--ghost:hover { border-color: var(--amber-line); color: var(--amber); transform: translateY(-2px); }

.btn .arrow { transition: transform .25s; }
.btn:hover .arrow { transform: translate(3px, -3px); }

/* Viewfinder corner brackets — reusable decorative frame */
.vf { position: relative; }
.vf::before, .vf::after {
  content: "";
  position: absolute;
  width: 18px; height: 18px;
  border: 1.5px solid var(--amber-line);
  pointer-events: none;
}
.vf::before { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.vf::after { bottom: 0; right: 0; border-left: 0; border-top: 0; }

.live-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.live-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 0 rgba(229,97,75,0.6);
  animation: pulse 2s infinite;
}
.live-dot--green { background: var(--green); box-shadow: 0 0 0 0 rgba(91,208,140,0.6); animation: pulseg 2s infinite; }
@keyframes pulse { 0%{box-shadow:0 0 0 0 rgba(229,97,75,0.5)} 70%{box-shadow:0 0 0 7px rgba(229,97,75,0)} 100%{box-shadow:0 0 0 0 rgba(229,97,75,0)} }
@keyframes pulseg { 0%{box-shadow:0 0 0 0 rgba(91,208,140,0.5)} 70%{box-shadow:0 0 0 7px rgba(91,208,140,0)} 100%{box-shadow:0 0 0 0 rgba(91,208,140,0)} }

/* ============================================================
   Header / Nav
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px var(--gutter);
  transition: background .35s, border-color .35s, padding .35s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(8,11,15,0.82);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom-color: var(--line);
  padding-top: 12px; padding-bottom: 12px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  position: relative;
  width: 26px; height: 26px;
  flex: none;
}
.brand-mark svg { width: 100%; height: 100%; display: block; }
.brand-name {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.22em;
  color: var(--text);
}
.nav-right { display: flex; align-items: center; gap: 14px; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  transition: color .2s;
  position: relative;
}
html[data-lang="zh"] .nav-links a { font-family: var(--sans); letter-spacing: 0.04em; font-size: 14px; }
.nav-links a:hover { color: var(--amber); }

/* Language toggle */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  padding: 3px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  position: relative;
  background: rgba(255,255,255,0.02);
}
.lang-toggle button {
  background: transparent;
  border: 0;
  color: var(--text-faint);
  padding: 5px 13px;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  letter-spacing: inherit;
  transition: color .25s;
  z-index: 1;
}
.lang-toggle button.active { color: #1A1206; }
.lang-toggle .lang-thumb {
  position: absolute;
  top: 3px; left: 3px;
  height: calc(100% - 6px);
  background: var(--amber);
  border-radius: 999px;
  transition: transform .3s cubic-bezier(.3,.8,.3,1), width .3s;
  z-index: 0;
}

.nav-cta { padding: 9px 18px; font-size: 12px; }

@media (max-width: 820px) {
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  .nav { gap: 14px; }
  .brand-name { font-size: 15px; letter-spacing: 0.18em; }
  .nav-right { display: none; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(80% 60% at 72% 30%, rgba(242,168,60,0.10), transparent 55%),
    radial-gradient(60% 80% at 15% 80%, rgba(40,60,90,0.22), transparent 60%),
    var(--ink-900);
}
/* faint street-grid / map lines */
.hero-bg::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(70% 70% at 60% 40%, black, transparent 75%);
  -webkit-mask-image: radial-gradient(70% 70% at 60% 40%, black, transparent 75%);
  opacity: .5;
}
.hero .wrap { position: relative; z-index: 2; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  min-width: 0;
}
.hero-copy, .hero-visual { min-width: 0; }
.hero-copy { max-width: 640px; }
.hero-meta {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  margin-bottom: 26px;
  font-family: var(--mono);
  color: var(--text-faint);
  font-size: 11px; letter-spacing: 0.2em;
}
.hero-meta > span, .hero-meta .live-tag span { white-space: nowrap; }
.hero h1 { margin: 22px 0 24px; }
.hero h1 .ln2 { color: var(--amber); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }
.hero-trust {
  display: flex; flex-wrap: wrap; gap: 22px 30px; margin-top: 40px;
  padding-top: 26px; border-top: 1px solid var(--line);
}
.hero-trust .ti { display: flex; align-items: center; gap: 9px; font-size: 13px; color: var(--text-dim); }
.hero-trust .ti svg { width: 16px; height: 16px; color: var(--amber); flex: none; }

/* Hero camera viewfinder visual */
.viewfinder {
  position: relative;
  aspect-ratio: 4 / 5;
  background: var(--ink-850);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 40px 120px -40px rgba(0,0,0,0.9);
}
.vf-feed {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(6,8,11,0.05), rgba(6,8,11,0.42)),
    radial-gradient(80% 65% at 42% 52%, rgba(242,168,60,0.08), transparent 62%),
    url("assets/detection/hero-person.jpg") center / cover no-repeat;
}
/* night street silhouette */
.vf-feed::before {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 0; height: 46%;
  background:
    linear-gradient(180deg, transparent, rgba(0,0,0,0.5)),
    repeating-linear-gradient(90deg, #0c1119 0 38px, #0e131c 38px 76px);
  clip-path: polygon(0 38%, 14% 22%, 28% 34%, 42% 14%, 58% 30%, 72% 12%, 86% 28%, 100% 18%, 100% 100%, 0 100%);
  opacity: 0;
}
.vf-feed::after {
  content: "";
  position: absolute; inset: 0;
  background: repeating-linear-gradient(to bottom, rgba(255,255,255,0.02) 0 1px, transparent 1px 4px);
}
/* scanning sweep */
.vf-scan {
  position: absolute; left: 0; right: 0; height: 32%;
  background: linear-gradient(180deg, transparent, rgba(242,168,60,0.10) 70%, rgba(242,168,60,0.22));
  border-bottom: 1px solid var(--amber-line);
  animation: scan 5.5s cubic-bezier(.55,0,.45,1) infinite;
}
@keyframes scan { 0%{ top:-32% } 100%{ top:100% } }

.vf-corner { position: absolute; width: 26px; height: 26px; border: 2px solid var(--amber); }
.vf-corner.tl { top:14px; left:14px; border-right:0; border-bottom:0; }
.vf-corner.tr { top:14px; right:14px; border-left:0; border-bottom:0; }
.vf-corner.bl { bottom:14px; left:14px; border-right:0; border-top:0; }
.vf-corner.br { bottom:14px; right:14px; border-left:0; border-top:0; }

.vf-hud { position: absolute; top: 18px; left: 0; right: 0; display: flex; justify-content: center; padding: 0 46px; }
.vf-hud .live-tag { background: rgba(6,8,11,0.6); padding: 5px 10px; border: 1px solid var(--line); border-radius: 3px; }
.vf-stamp {
  position: absolute; bottom: 18px; left: 46px;
  font-family: var(--mono); font-size: 12px; color: var(--amber);
  letter-spacing: 0.1em;
}
.vf-stamp .blink { animation: blink 1.2s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.vf-meta-r {
  position: absolute; bottom: 18px; right: 46px;
  font-family: var(--mono); font-size: 11px; color: var(--text-faint); letter-spacing: 0.1em; text-align: right;
}

/* AI detection box appearing on a person */
.vf-detect {
  position: absolute;
  left: 31%; top: 42.8%;
  width: 18%; height: 25.5%;
  border: 1.5px solid var(--green);
  border-radius: 2px;
  box-shadow: 0 0 18px rgba(91,208,140,0.25), inset 0 0 30px rgba(91,208,140,0.06);
  opacity: 1;
  animation: detect 5.5s ease-in-out infinite;
}
.vf-detect .figure {
  display: none;
}
.vf-detect .figure::before {
  content:""; position:absolute; left:50%; top:8%; transform:translateX(-50%);
  width:26%; aspect-ratio:1; border-radius:50%; background:#10161f;
}
.vf-detect .figure::after {
  content:""; position:absolute; left:50%; top:30%; transform:translateX(-50%);
  width:58%; height:62%; border-radius:40% 40% 18% 18%; background:#0d1219;
}
.vf-detect .label {
  position: absolute; top: -22px; left: -1px;
  background: var(--green); color: #04140A;
  font-family: var(--mono); font-size: 10px; font-weight: 700;
  letter-spacing: 0.06em; padding: 2px 7px; border-radius: 2px;
  white-space: nowrap;
}
@keyframes detect {
  0%, 100% { opacity: 1; }
  50% { opacity: .82; }
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .viewfinder { width: 100%; max-width: 420px; margin: 0 auto; }
}
@media (max-width: 560px) {
  .hero-copy { width: 100%; }
  .hero-copy .lead { overflow-wrap: anywhere; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; min-width: 0; padding-left: 16px; padding-right: 16px; }
  .hero-trust { display: grid; grid-template-columns: 1fr; gap: 14px; }
  .hero-trust .ti { min-width: 0; }
}

/* ============================================================
   Infrastructure support
   ============================================================ */
.support-strip {
  position: relative;
  z-index: 2;
  background: var(--ink-900);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 26px 0;
}
.support-inner {
  display: grid;
  grid-template-columns: minmax(150px, 0.55fr) minmax(360px, 1.5fr) minmax(220px, 0.85fr);
  gap: 22px;
  align-items: center;
}
.support-kicker {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--text-dim);
  text-transform: uppercase;
}
html[data-lang="zh"] .support-kicker { font-family: var(--sans); letter-spacing: 0.06em; font-size: 13px; }
.support-marks {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.support-mark {
  min-width: 0;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.028);
  padding: 13px 14px 12px;
}
.support-mark .mark-name,
.support-mark .mark-detail {
  display: block;
  line-height: 1;
}
.support-mark .mark-name {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text);
  white-space: nowrap;
}
.support-mark .mark-detail {
  margin-top: 7px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.support-mark--nvidia .mark-name { color: #76B900; }
.support-mark--aws .mark-name { color: #FF9900; letter-spacing: 0.02em; }
.support-mark--lambda .mark-name { color: #E9EDF2; letter-spacing: 0; }
.support-note {
  color: var(--text-dim);
  font-size: 12.5px;
  line-height: 1.45;
  max-width: 34ch;
}
@media (max-width: 980px) {
  .support-inner { grid-template-columns: 1fr; }
  .support-note { max-width: 70ch; }
}
@media (max-width: 560px) {
  .support-marks { grid-template-columns: 1fr; }
}

/* ============================================================
   Stats / Why now
   ============================================================ */
.threat { background: var(--ink-850); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { max-width: 760px; margin-bottom: 56px; }
.sec-head .eyebrow { margin-bottom: 22px; }
.sec-head .h2 { margin-bottom: 0; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head.center .eyebrow { justify-content: center; }

.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.stat {
  background: var(--ink-800);
  padding: 38px 32px 34px;
  position: relative;
}
.stat .num {
  font-family: var(--serif);
  font-size: clamp(46px, 5.5vw, 72px);
  font-weight: 300;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}
html[data-lang="zh"] .stat .num { font-weight: 500; }
.stat .cap { margin-top: 16px; font-size: 15px; color: var(--text-dim); line-height: 1.5; max-width: 24ch; }
.stat .tag {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--text-faint); margin-bottom: 16px; display: block;
}
.source-note { margin-top: 24px; font-family: var(--mono); font-size: 11px; color: var(--text-ghost); letter-spacing: 0.03em; line-height: 1.6; }

@media (max-width: 740px) { .stat-grid { grid-template-columns: 1fr; } }

/* ============================================================
   Pull quote / problem
   ============================================================ */
.quote-sec { text-align: center; }
.pull {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(26px, 3.6vw, 46px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  max-width: 18ch;
  margin: 0 auto 12px;
}
html[data-lang="zh"] .pull { font-weight: 500; line-height: 1.4; max-width: 22ch; }
.pull .em { color: var(--amber); font-style: italic; }
html[data-lang="zh"] .pull .em { font-style: normal; }
.pull-sub { color: var(--text-faint); font-family: var(--mono); font-size: 12px; letter-spacing: 0.2em; text-transform: uppercase; margin-top: 28px; }

.problem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 64px; }
.prob-card {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px;
  text-align: left;
  position: relative;
}
.prob-card .pc-ico { width: 38px; height: 38px; color: var(--text-faint); margin-bottom: 22px; }
.prob-card h3 { font-family: var(--sans); font-weight: 600; font-size: 19px; margin-bottom: 10px; letter-spacing: 0; }
.prob-card p { color: var(--text-dim); font-size: 15px; }
@media (max-width: 740px) { .problem-grid { grid-template-columns: 1fr; } }

/* ============================================================
   Pipeline / How it works
   ============================================================ */
.pipe-rail {
  display: flex; align-items: center; gap: 0;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em;
  color: var(--text-faint); margin-bottom: 52px; flex-wrap: wrap;
}
.pipe-rail .node { color: var(--amber); padding: 6px 0; }
.pipe-rail .sep { color: var(--text-ghost); padding: 0 16px; }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px 32px;
  position: relative;
  overflow: hidden;
  transition: border-color .3s, transform .3s, background .3s;
}
.step:hover { border-color: var(--amber-line); transform: translateY(-4px); background: var(--ink-750); }
.step .idx {
  font-family: var(--mono); font-size: 12px; color: var(--amber);
  letter-spacing: 0.1em; margin-bottom: 26px; display: flex; justify-content: space-between; align-items: center;
}
.step .idx .of { color: var(--text-ghost); }
.step .ico { width: 40px; height: 40px; color: var(--amber); margin-bottom: 20px; }
.step h3 { font-family: var(--sans); font-weight: 600; font-size: 18px; margin-bottom: 10px; letter-spacing: 0; }
.step p { color: var(--text-dim); font-size: 14.5px; line-height: 1.55; }
.step::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--amber); transition: width .4s;
}
.step:hover::after { width: 100%; }
@media (max-width: 900px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }

/* ============================================================
   Payoff / Dashboard preview
   ============================================================ */
.payoff { background: var(--ink-850); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.payoff-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.payoff .alert-stat {
  font-family: var(--serif); font-weight: 300; font-size: clamp(54px, 7vw, 96px);
  line-height: 1; color: var(--amber); letter-spacing: -0.02em; margin: 8px 0 18px;
}
html[data-lang="zh"] .payoff .alert-stat { font-weight: 500; }

/* multi-cam dashboard mock */
.dash {
  background: var(--ink-900);
  border: 1px solid var(--line-2);
  border-radius: 8px;
  padding: 14px;
  box-shadow: 0 50px 120px -50px rgba(0,0,0,0.9);
  position: relative;
}
.dash-bar { display: flex; align-items: center; justify-content: space-between; padding: 4px 6px 12px; }
.dash-bar .dots { display: flex; gap: 6px; }
.dash-bar .dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--ink-600); display: block; }
.dash-bar .t { font-family: var(--mono); font-size: 11px; color: var(--text-faint); letter-spacing: 0.1em; }
.cam-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.cam {
  position: relative; aspect-ratio: 16/10; border-radius: 4px; overflow: hidden;
  background: linear-gradient(180deg, #0e141c, #080c11); border: 1px solid var(--line);
}
.cam .label { position: absolute; top: 7px; left: 8px; font-family: var(--mono); font-size: 9px; letter-spacing: 0.12em; color: var(--text-dim); background: rgba(0,0,0,0.4); padding: 2px 6px; border-radius: 2px; }
.cam .dot { position: absolute; top: 9px; right: 9px; width: 6px; height: 6px; border-radius: 50%; background: var(--green); }
.cam.alert { border-color: var(--amber-line); }
.cam.alert .dot { background: var(--red); animation: pulse 1.5s infinite; }
.cam .scape {
  position: absolute; inset: 0;
  background-position: center;
  background-size: cover;
  opacity: .92;
}
.cam .scape::after {
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(0,0,0,0.2), rgba(0,0,0,0.32)),
    repeating-linear-gradient(to bottom, rgba(255,255,255,0.025) 0 1px, transparent 1px 4px);
}
.cam--driveway .scape { background-image: url("assets/detection/cam-driveway.jpg"); }
.cam--front .scape { background-image: url("assets/detection/cam-front-door.jpg"); background-position: center; }
.cam--gate .scape { background-image: url("assets/detection/cam-gate.jpg"); }
.cam--garden .scape { background-image: url("assets/detection/cam-garden.jpg"); }
.cam .box { position: absolute; left: 61%; top: 18%; width: 15%; height: 57%; border: 1.5px solid var(--amber); border-radius: 2px; box-shadow: 0 0 14px rgba(242,168,60,0.3); }
.cam .box .tag { position: absolute; top: -16px; left: -1px; background: var(--amber); color: #1a1206; font-family: var(--mono); font-size: 8px; font-weight: 700; padding: 1px 5px; border-radius: 2px; }

/* phone alert */
.phone-alert {
  position: absolute; right: -18px; bottom: -26px;
  width: 250px;
  background: rgba(12,16,22,0.94);
  border: 1px solid var(--line-2);
  border-radius: 14px;
  padding: 14px;
  backdrop-filter: blur(8px);
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.8);
}
.phone-alert .pa-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.phone-alert .pa-ico { width: 26px; height: 26px; border-radius: 6px; background: var(--amber); display: grid; place-items: center; color: #1a1206; flex: none; }
.phone-alert .pa-ico svg { width: 15px; height: 15px; }
.phone-alert .pa-title { font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em; color: var(--text); font-weight: 600; }
.phone-alert .pa-time { font-family: var(--mono); font-size: 9px; color: var(--text-faint); margin-left: auto; }
.phone-alert .pa-snap { aspect-ratio: 16/10; border-radius: 7px; overflow: hidden; position: relative; background: linear-gradient(180deg,#0e141c,#080c11); }
.phone-alert .pa-snap .scape {
  position:absolute; inset:0;
  background-position: center;
  background-size: cover;
  opacity:.95;
}
.phone-alert .pa-snap--front .scape { background-image: url("assets/detection/cam-front-door.jpg"); }
.phone-alert .pa-snap .scape::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.08), rgba(0,0,0,0.26));
}
.phone-alert .pa-snap .box { position:absolute; left:61%; top:18%; width:15%; height:57%; border:1.5px solid var(--amber); border-radius:2px; }
.phone-alert .pa-msg { margin-top: 9px; font-size: 12px; color: var(--text-dim); }

@media (max-width: 900px) { .payoff-grid { grid-template-columns: 1fr; } .phone-alert { right: 8px; bottom: -30px; width: 210px; } }

/* ============================================================
   Difference / checklist + comparison
   ============================================================ */
.diff-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; margin-bottom: 64px; }
.diff {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px;
  background: var(--ink-800); position: relative;
}
.diff .check { width: 26px; height: 26px; border-radius: 50%; border: 1.5px solid var(--amber); color: var(--amber); display: grid; place-items: center; margin-bottom: 18px; }
.diff .check svg { width: 13px; height: 13px; }
.diff h3 { font-family: var(--mono); font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text); margin-bottom: 8px; font-weight: 600; }
html[data-lang="zh"] .diff h3 { font-family: var(--sans); letter-spacing: 0.02em; font-size: 16px; }
.diff p { font-size: 13.5px; color: var(--text-dim); line-height: 1.5; }
@media (max-width: 900px){ .diff-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px){ .diff-grid { grid-template-columns: 1fr; } }

.compare { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.compare table { width: 100%; border-collapse: collapse; }
.compare th, .compare td { text-align: left; padding: 18px 24px; border-bottom: 1px solid var(--line); font-size: 15px; }
.compare thead th { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-faint); background: var(--ink-850); font-weight: 500; }
.compare thead th.cip { color: var(--amber); }
html[data-lang="zh"] .compare thead th { font-family: var(--sans); letter-spacing: 0.04em; }
.compare td.feat { color: var(--text-dim); }
.compare td.cip { color: var(--text); font-weight: 600; background: rgba(242,168,60,0.04); }
.compare td.other { color: var(--text-faint); }
.compare tr:last-child td { border-bottom: 0; }
.compare td .yes { color: var(--green); }
.compare td .no { color: var(--text-ghost); }

/* ============================================================
   Privacy manifesto
   ============================================================ */
.privacy { text-align: center; position: relative; overflow: hidden; }
.privacy-head {
  font-family: var(--serif); font-weight: 300;
  font-size: clamp(34px, 5.5vw, 72px); line-height: 1.08; letter-spacing: -0.02em;
  margin-bottom: 26px;
}
html[data-lang="zh"] .privacy-head { font-weight: 500; line-height: 1.2; }
.privacy-head span { display: inline-block; }
.privacy-head .a { color: var(--amber); }
.house-diagram { max-width: 540px; margin: 52px auto 0; position: relative; }
.house-diagram svg { width: 100%; height: auto; }

/* ============================================================
   Questionnaire CTA
   ============================================================ */
.survey { background: var(--ink-850); border-top: 1px solid var(--line); }
.survey-card {
  position: relative;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background:
    radial-gradient(80% 120% at 80% 0%, rgba(242,168,60,0.08), transparent 60%),
    var(--ink-800);
  padding: clamp(40px, 6vw, 72px);
  overflow: hidden;
}
.survey-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(36px, 5vw, 64px); align-items: center; }
.survey h2 { margin: 20px 0 18px; }
.survey .lead { margin-bottom: 34px; }
.survey-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.survey-points { list-style: none; display: flex; flex-direction: column; gap: 2px; }
.survey-points li {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 16px 0; border-bottom: 1px solid var(--line);
  font-size: 15px; color: var(--text-dim);
}
.survey-points li:last-child { border-bottom: 0; }
.survey-points .qn { font-family: var(--mono); font-size: 12px; color: var(--amber); flex: none; padding-top: 2px; letter-spacing: 0.08em; }
.survey-points b { color: var(--text); font-weight: 600; font-family: var(--sans); display: block; }
.survey-time { font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-faint); display: inline-flex; align-items: center; gap: 9px; }
.survey-time svg { width: 15px; height: 15px; color: var(--amber); }
@media (max-width: 860px){ .survey-grid { grid-template-columns: 1fr; } }

/* ============================================================
   Footer
   ============================================================ */
.foot { padding: 64px 0 40px; position: relative; z-index: 2; border-top: 1px solid var(--line); }
.foot-top { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; padding-bottom: 44px; border-bottom: 1px solid var(--line); }
.foot-brand { max-width: 320px; }
.foot-brand .brand { margin-bottom: 16px; }
.foot-brand p { color: var(--text-faint); font-size: 14px; }
.foot-cols { display: flex; gap: clamp(36px, 6vw, 80px); flex-wrap: wrap; }
.foot-col h4 { font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-faint); margin-bottom: 16px; font-weight: 500; }
html[data-lang="zh"] .foot-col h4 { font-family: var(--sans); letter-spacing: 0.04em; }
.foot-col a, .foot-col span { display: block; color: var(--text-dim); font-size: 14px; margin-bottom: 11px; transition: color .2s; }
.foot-col a:hover { color: var(--amber); }
.foot-bottom { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; padding-top: 28px; align-items: flex-start; }
.foot-bottom .copy { font-family: var(--mono); font-size: 11px; color: var(--text-ghost); letter-spacing: 0.04em; }
.disclaimer { max-width: 560px; font-size: 12px; color: var(--text-ghost); line-height: 1.6; }

/* ============================================================
   Reveal animations
   ============================================================ */
/* Only hide reveals once JS confirms it can bring them back */
html.js-reveal .reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s cubic-bezier(.2,.7,.3,1), transform .8s cubic-bezier(.2,.7,.3,1); }
html.js-reveal .reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }

/* Tweak: hero grid backdrop toggle */
html.no-herogrid .hero-bg::after { display: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}