/* ============================================================
   Amfuture — dark purple neon landing page
   Palette & type per spec; every hex is a purpose variable.
   ============================================================ */
:root {
  --bg: #08060F;
  --bg-alt: #0F0A1E;
  --glass: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(167, 139, 250, 0.18);
  --primary: #8B5CF6;
  --primary-bright: #A78BFA;
  --accent: #D946EF;
  --grad: linear-gradient(135deg, #8B5CF6 0%, #D946EF 100%);
  --text: #F4F1FF;
  --text-muted: #9C95B8;
  --glow: 0 0 40px rgba(139, 92, 246, 0.25);
  --read: #60A5FA;
  --nav-bg: rgba(10, 7, 20, 0.7);
  --font-display: "Space Grotesk", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container: 1200px;
  --radius-card: 16px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; background: none; border: none; color: inherit; }

/* ---------- ambient background ---------- */
.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 900px 600px at 50% -100px, rgba(139, 92, 246, 0.15), transparent 70%),
    radial-gradient(1.5px 1.5px at 12% 22%, rgba(167, 139, 250, 0.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 32% 68%, rgba(167, 139, 250, 0.35) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 55% 12%, rgba(217, 70, 239, 0.3) 50%, transparent 51%),
    radial-gradient(1px 1px at 72% 44%, rgba(167, 139, 250, 0.4) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 86% 78%, rgba(167, 139, 250, 0.3) 50%, transparent 51%),
    radial-gradient(1px 1px at 45% 88%, rgba(217, 70, 239, 0.25) 50%, transparent 51%),
    radial-gradient(1px 1px at 92% 18%, rgba(167, 139, 250, 0.4) 50%, transparent 51%);
  background-size: auto, 480px 480px, 380px 380px, 560px 560px, 420px 420px, 500px 500px, 360px 360px, 440px 440px;
}

/* ---------- layout ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 32px; }
.container-narrow { max-width: 860px; }
.section { padding: 110px 0; position: relative; }
.section-alt { background: var(--bg-alt); }

.section-head { text-align: center; max-width: 820px; margin: 0 auto 56px; }
.section-head h2 { margin-bottom: 16px; }
.section-sub { color: var(--text-muted); font-size: 17px; }
.section-sub.left { text-align: left; }

h1, h2, h3 { font-family: var(--font-display); color: var(--text); }
h2 { font-size: clamp(28px, 4vw, 44px); font-weight: 700; line-height: 1.15; }

.eyebrow {
  font-size: 13px; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--primary-bright); margin-bottom: 14px;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.grad-bg { background: var(--grad); }

/* ---------- glass card ---------- */
.glass-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 28px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--glow);
  border-color: rgba(167, 139, 250, 0.4);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-block;
  border-radius: 10px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(139, 92, 246, 0.45); }
.btn-ghost { border: 1px solid var(--primary); color: var(--primary-bright); background: transparent; }
.btn-ghost:hover { transform: translateY(-2px); background: rgba(139, 92, 246, 0.1); }
.btn-lg { padding: 15px 36px; font-size: 17px; border-radius: 12px; }

/* ---------- nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--glass-border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 24px; }
.nav-logo img {
  height: 32px; width: auto;
  filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.25));
}
.nav-links { display: flex; gap: 28px; }
.nav-links a { font-size: 14.5px; font-weight: 500; color: var(--text-muted); transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }
.nav-right { display: flex; align-items: center; gap: 16px; }

.lang-toggle {
  font-size: 13px; font-weight: 600; letter-spacing: 0.04em;
  border: 1px solid var(--glass-border);
  border-radius: 999px; padding: 6px 12px;
  color: var(--text-muted);
  transition: border-color 0.2s;
}
.lang-toggle:hover { border-color: var(--primary-bright); }
.lang-opt { transition: color 0.2s; }
.lang-toggle[data-active="en"] .lang-opt[data-lang="en"],
.lang-toggle[data-active="zh"] .lang-opt[data-lang="zh"] { color: var(--primary-bright); }
.lang-sep { opacity: 0.4; margin: 0 2px; }

.nav-burger { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.nav-burger span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: transform 0.3s, opacity 0.3s; }
.nav-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- hero ---------- */
.hero { padding-top: 170px; padding-bottom: 90px; }
.hero-grid { display: grid; grid-template-columns: 55% 45%; gap: 48px; align-items: center; }
.hero-h1 {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 24px;
}
.hero-body { color: var(--text-muted); font-size: 17px; max-width: 560px; margin-bottom: 32px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 36px; }

.trust-list { display: flex; flex-direction: column; gap: 10px; }
.trust-list li { display: flex; align-items: center; gap: 10px; color: var(--text-muted); font-size: 14.5px; }
.trust-list .ico { width: 18px; height: 18px; color: var(--primary-bright); flex: none; }

.hero-visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  /* no card chrome: edges dissolve into --bg via mask, per brief */
  border-radius: 0;
  border: none;
  box-shadow: none;
  -webkit-mask-image: radial-gradient(ellipse 62% 58% at 50% 46%, #000 35%, transparent 82%);
  mask-image: radial-gradient(ellipse 62% 58% at 50% 46%, #000 35%, transparent 82%);
  animation: heroFloat 6s ease-in-out infinite;
}
@keyframes heroFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  margin-top: 80px; padding-top: 48px; border-top: 1px solid var(--glass-border);
}
.stat { text-align: center; }
.stat-num {
  display: block;
  font-family: var(--font-display); font-weight: 700; font-size: clamp(28px, 3.4vw, 42px);
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  line-height: 1.2;
}
.stat-label { color: var(--text-muted); font-size: 14px; }

/* ---------- problem / iceberg ---------- */
.problem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.iceberg-wrap { display: flex; justify-content: center; }
.iceberg { position: relative; width: 100%; max-width: 480px; }
.iceberg svg { width: 100%; height: auto; filter: drop-shadow(0 0 30px rgba(139, 92, 246, 0.25)); }
.ice-label {
  position: absolute; left: 50%; transform: translateX(-50%);
  font-size: 13.5px; font-weight: 600; text-align: center;
  padding: 6px 14px; border-radius: 999px; white-space: nowrap;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.ice-label-top {
  top: 14%;
  color: var(--text);
  background: rgba(139, 92, 246, 0.25);
  border: 1px solid rgba(167, 139, 250, 0.5);
}
.ice-label-bottom {
  top: 64%;
  color: var(--text-muted);
  background: rgba(15, 10, 30, 0.75);
  border: 1px solid var(--glass-border);
}

.problem-copy .eyebrow { color: var(--accent); }
.challenge-list { display: flex; flex-direction: column; gap: 12px; margin: 24px 0; }
.challenge-list li { display: flex; align-items: center; gap: 12px; color: var(--text-muted); font-size: 15.5px; }
.ch-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--grad); flex: none; }

.opportunity { color: var(--text-muted); font-size: 15.5px; margin-bottom: 28px; }
.opp-tag {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--primary-bright);
  background: rgba(139, 92, 246, 0.12); border: 1px solid rgba(167, 139, 250, 0.35);
  border-radius: 999px; padding: 3px 12px; margin-right: 10px;
}

.big-stat-card { display: flex; align-items: center; gap: 24px; padding: 28px 32px; }
.big-stat-num { font-family: var(--font-display); font-weight: 700; font-size: clamp(44px, 5vw, 60px); line-height: 1; flex: none; }
.big-stat-label { color: var(--text-muted); font-size: 15px; }

/* ---------- platform hub ---------- */
.hub { display: grid; grid-template-columns: 1fr auto 1fr; gap: 24px; align-items: center; }
.hub-col { display: flex; flex-direction: column; gap: 20px; }
.channel-card { display: flex; align-items: center; gap: 14px; padding: 18px 22px; }
.ch-ico {
  width: 44px; height: 44px; border-radius: 10px; flex: none;
  background: rgba(139, 92, 246, 0.12);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary-bright);
}
.ch-ico svg { width: 22px; height: 22px; }
.ch-name { display: flex; flex-direction: column; font-weight: 600; font-size: 15px; line-height: 1.35; }
.ch-zh { font-weight: 400; font-size: 12.5px; color: var(--text-muted); }
.ch-zh em { font-style: normal; }

.hub-core-wrap { position: relative; display: flex; align-items: center; justify-content: center; padding: 20px 0; }
.hub-line {
  position: absolute; top: 50%; width: 90px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-bright), transparent);
  opacity: 0.7;
}
.hub-line-left { right: calc(100% - 26px); }
.hub-line-right { left: calc(100% - 26px); }
.hub-core {
  position: relative; z-index: 1;
  width: 140px; height: 140px; border-radius: 50%;
  background: radial-gradient(circle at 50% 40%, rgba(217, 70, 239, 0.35), rgba(139, 92, 246, 0.18) 55%, transparent 75%);
  border: 1px solid rgba(167, 139, 250, 0.5);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  box-shadow: var(--glow), inset 0 0 40px rgba(139, 92, 246, 0.2);
  color: var(--primary-bright);
  animation: corePulse 4s ease-in-out infinite;
}
.hub-core svg { width: 30px; height: 30px; }
.hub-core-label { font-size: 12px; font-weight: 600; color: var(--text); text-align: center; padding: 0 12px; line-height: 1.3; }
@keyframes corePulse {
  0%, 100% { box-shadow: 0 0 30px rgba(139, 92, 246, 0.25), inset 0 0 40px rgba(139, 92, 246, 0.2); }
  50% { box-shadow: 0 0 60px rgba(217, 70, 239, 0.4), inset 0 0 40px rgba(139, 92, 246, 0.3); }
}
.hub-list-mobile { display: none; }

/* ---------- AI employees ---------- */
.ai-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; align-items: stretch; }
.ai-card { position: relative; display: flex; flex-direction: column; padding: 30px 26px; }
.ai-ico {
  width: 44px; height: 44px; border-radius: 10px;
  background: rgba(139, 92, 246, 0.12);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary-bright); margin-bottom: 18px;
}
.ai-ico svg { width: 22px; height: 22px; }
.ai-name { font-size: 19px; font-weight: 600; line-height: 1.3; display: flex; flex-direction: column; margin-bottom: 12px; }
.ai-name-zh { font-size: 13px; font-weight: 400; color: var(--text-muted); }
.ai-price { margin-bottom: 14px; }
.price-num { font-family: var(--font-display); font-weight: 700; font-size: 30px; color: var(--text); }
.price-per { color: var(--text-muted); font-size: 14px; }
.ai-desc { color: var(--text-muted); font-size: 14.5px; line-height: 1.7; flex: 1; margin-bottom: 18px; }
.ai-guarantee {
  font-size: 13px; color: var(--primary-bright);
  background: rgba(139, 92, 246, 0.1); border-left: 2px solid var(--primary);
  padding: 10px 12px; border-radius: 0 8px 8px 0; margin-bottom: 18px;
}
.status-pill {
  align-self: flex-start;
  font-size: 12px; font-weight: 600; border-radius: 999px; padding: 4px 14px;
}
.status-live { color: #6EE7B7; background: rgba(52, 211, 153, 0.1); border: 1px solid rgba(52, 211, 153, 0.4); }
.status-soon { color: var(--primary-bright); background: rgba(139, 92, 246, 0.12); border: 1px solid rgba(167, 139, 250, 0.4); }
.status-plan { color: var(--text-muted); background: rgba(255, 255, 255, 0.05); border: 1px solid var(--glass-border); }

.ai-card-featured {
  border: 1px solid rgba(167, 139, 250, 0.55);
  background: rgba(139, 92, 246, 0.07);
  box-shadow: var(--glow);
}
.roi-badge {
  position: absolute; top: -13px; right: 20px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
  color: #fff; border-radius: 999px; padding: 5px 14px;
  box-shadow: 0 4px 20px rgba(217, 70, 239, 0.5);
  white-space: nowrap;
}

/* ---------- conversational ops ---------- */
.conv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.chat-mock {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 14px 14px 20px; margin: 28px 0 24px;
  border-radius: 14px;
}
.chat-text { flex: 1; color: var(--text-muted); font-size: 15px; }
.chat-send {
  width: 42px; height: 42px; border-radius: 10px; flex: none;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
}
.chat-send svg { width: 20px; height: 20px; }
.cap-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.cap-tags li {
  font-size: 13px; font-weight: 500; color: var(--primary-bright);
  border: 1px solid rgba(167, 139, 250, 0.35); background: rgba(139, 92, 246, 0.1);
  border-radius: 999px; padding: 6px 16px;
}
.conv-visual img {
  width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
  border-radius: 20px; border: 1px solid var(--glass-border);
  box-shadow: var(--glow), 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* ---------- use cases ---------- */
.semantic-pills { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 40px; }
.sem-pill {
  font-size: 13px; border-radius: 999px; padding: 8px 18px;
  color: var(--text-muted);
}
.sem-pill b { font-weight: 700; }
.sem-read { background: rgba(96, 165, 250, 0.12); border: 1px solid rgba(96, 165, 250, 0.45); }
.sem-read b { color: var(--read); }
.sem-write { background: rgba(217, 70, 239, 0.12); border: 1px solid rgba(217, 70, 239, 0.45); }
.sem-write b { color: var(--accent); }
.sem-analyze { background: rgba(139, 92, 246, 0.12); border: 1px solid rgba(139, 92, 246, 0.5); }
.sem-analyze b { color: var(--primary-bright); }

.uc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }
.uc-card { padding: 24px 22px; display: flex; flex-direction: column; gap: 8px; }
.uc-letter {
  font-family: var(--font-display); font-weight: 700; font-size: 15px;
  width: 34px; height: 34px; border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  background: var(--grad); color: #fff;
  box-shadow: 0 4px 14px rgba(139, 92, 246, 0.35);
}
.uc-name { font-size: 15.5px; font-weight: 600; line-height: 1.35; display: flex; flex-direction: column; }
.uc-zh { font-size: 12.5px; font-weight: 400; color: var(--text-muted); margin-top: 2px; }
.uc-count { font-family: var(--font-display); font-weight: 700; font-size: 20px; color: var(--primary-bright); }
.uc-count span { font-family: var(--font-body); font-weight: 400; font-size: 12.5px; color: var(--text-muted); }
.uc-words { font-size: 13.5px; color: var(--text-muted); line-height: 1.6; }

/* ---------- compounding intelligence ---------- */
.ci-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.loop-nodes { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; justify-content: center; }
.loop-node { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.loop-node b {
  width: 56px; height: 56px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 700; font-size: 18px;
  background: rgba(139, 92, 246, 0.12); border: 1px solid rgba(167, 139, 250, 0.5);
  color: var(--primary-bright);
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.2);
}
.loop-node em { font-style: normal; font-size: 12.5px; font-weight: 600; color: var(--text-muted); text-align: center; max-width: 84px; }
.loop-arrow { color: var(--primary); font-size: 18px; margin-bottom: 22px; }
.loop-return { margin: 6px 0 14px; }
.loop-return svg { width: 100%; height: 40px; display: block; }
.ci-note { color: var(--text-muted); font-size: 14.5px; text-align: center; }

.ci-curve { position: relative; }
.curve-svg { width: 100%; height: auto; filter: drop-shadow(0 0 24px rgba(139, 92, 246, 0.3)); }
.milestones { margin-top: 28px; display: flex; flex-direction: column; gap: 14px; }
.milestones li { display: flex; gap: 14px; align-items: baseline; }
.ms-month {
  flex: none; width: 88px;
  font-family: var(--font-display); font-weight: 700; font-size: 14px; color: var(--primary-bright);
}
.ms-text { color: var(--text-muted); font-size: 14.5px; }

/* ---------- security ---------- */
.sec-stack { display: flex; flex-direction: column; align-items: center; gap: 14px; max-width: 900px; margin: 0 auto; }
.sec-layer { width: var(--w); padding: 20px 28px; text-align: center; }
.sec-layer h3 { font-size: 17px; font-weight: 600; display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap; }
.sec-tag {
  font-family: var(--font-display); font-size: 11px; font-weight: 700; letter-spacing: 0.06em;
  background: var(--grad); color: #fff; border-radius: 6px; padding: 2px 8px;
}
.sec-zh { font-size: 12.5px; font-weight: 400; color: var(--text-muted); }
.sec-layer p { font-size: 13.5px; color: var(--text-muted); margin-top: 4px; }
.sec-l1 { background: rgba(167, 139, 250, 0.14); border-color: rgba(167, 139, 250, 0.5); box-shadow: 0 0 30px rgba(139, 92, 246, 0.3); }
.sec-l2 { background: rgba(139, 92, 246, 0.1); }
.sec-l3 { background: rgba(139, 92, 246, 0.08); }
.sec-l4 { background: rgba(139, 92, 246, 0.06); }
.sec-l5 { background: rgba(255, 255, 255, 0.03); }

/* ---------- payments ---------- */
.pay-row { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.pay-pill {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13.5px; font-weight: 500; color: var(--text-muted);
  border: 1px solid var(--glass-border); background: var(--glass);
  border-radius: 999px; padding: 8px 18px;
  transition: border-color 0.25s, color 0.25s, transform 0.25s;
}
.pay-pill:hover { border-color: var(--primary-bright); color: var(--text); transform: translateY(-2px); }
.pay-ico { width: 20px; height: 14px; color: var(--primary-bright); flex: none; }

/* ---------- pricing ---------- */
.pricing-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 24px; }
.price-col { padding: 32px; }
.price-col:hover { transform: none; }
.price-col-title { font-size: 18px; font-weight: 600; margin-bottom: 24px; }
.price-col-title small { font-size: 13px; font-weight: 400; color: var(--text-muted); }
.price-rows { display: flex; flex-direction: column; }
.price-rows li {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 16px 0; border-bottom: 1px solid rgba(167, 139, 250, 0.12);
}
.price-rows li:last-child { border-bottom: none; }
.pr-name { display: flex; flex-direction: column; font-size: 15px; font-weight: 500; }
.pr-name small { font-size: 12px; font-weight: 400; color: var(--primary-bright); }
.pr-val { font-family: var(--font-display); font-weight: 700; font-size: 22px; white-space: nowrap; }
.pr-val span { font-family: var(--font-body); font-weight: 400; font-size: 13px; color: var(--text-muted); }

.module-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 24px; margin-bottom: 24px; }
.module-grid li {
  display: flex; justify-content: space-between; align-items: baseline; gap: 10px;
  padding: 9px 0; border-bottom: 1px solid rgba(167, 139, 250, 0.1);
  font-size: 14px; color: var(--text-muted);
}
.module-grid b { font-family: var(--font-display); font-weight: 700; font-size: 15px; color: var(--text); white-space: nowrap; }
.bundle-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  border-radius: 12px; padding: 16px 24px;
  font-size: 15px; font-weight: 600; color: #fff;
  box-shadow: 0 8px 30px rgba(139, 92, 246, 0.4);
}
.bundle-bar b { font-family: var(--font-display); font-size: 20px; }

.model-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 24px; }
.model-card h3 { font-size: 18px; font-weight: 600; display: flex; flex-direction: column; margin-bottom: 10px; }
.model-zh { font-size: 13px; font-weight: 400; color: var(--text-muted); }
.model-card p { color: var(--text-muted); font-size: 14.5px; }

.onetime { text-align: center; color: var(--text-muted); font-size: 13px; line-height: 2; }

/* ---------- case studies ---------- */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card { text-align: center; padding: 36px 28px; }
.case-brand { font-size: 16px; font-weight: 600; color: var(--text-muted); letter-spacing: 0.03em; margin-bottom: 12px; }
.case-num { font-family: var(--font-display); font-weight: 700; font-size: clamp(32px, 3.6vw, 44px); line-height: 1.1; margin-bottom: 10px; }
.case-label { color: var(--text-muted); font-size: 14px; }
.case-note { text-align: center; color: var(--text-muted); font-size: 13px; margin-top: 20px; }
.cases-img { margin-top: 48px; }
.cases-img img {
  width: 100%; aspect-ratio: 16 / 7; object-fit: cover;
  border-radius: 20px; border: 1px solid var(--glass-border);
  box-shadow: var(--glow);
}

/* ---------- vision temple ---------- */
.temple { max-width: 860px; margin: 0 auto; }
.temple-beam {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  border-radius: 14px; padding: 20px;
  color: #fff; text-align: center;
  box-shadow: 0 10px 40px rgba(139, 92, 246, 0.45);
  margin-bottom: 20px;
}
.temple-beam span:first-child { font-family: var(--font-display); font-weight: 700; font-size: 20px; }
.beam-zh { font-size: 13px; opacity: 0.85; }
.temple-pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pillar { text-align: center; padding: 32px 24px; border-top: 3px solid var(--primary); }
.pillar-ico {
  width: 44px; height: 44px; border-radius: 10px; margin: 0 auto 16px;
  background: rgba(139, 92, 246, 0.12); color: var(--primary-bright);
  display: flex; align-items: center; justify-content: center;
}
.pillar-ico svg { width: 22px; height: 22px; }
.pillar h3 { font-size: 18px; font-weight: 600; display: flex; flex-direction: column; gap: 2px; margin-bottom: 8px; }
.pillar-zh { font-size: 13px; font-weight: 400; color: var(--text-muted); }
.pillar p { color: var(--text-muted); font-size: 14px; }
.vision-closing { text-align: center; max-width: 640px; margin: 48px auto 0; color: var(--text); font-size: 18px; font-family: var(--font-display); font-weight: 500; }

/* ---------- final CTA ---------- */
.cta-final {
  position: relative;
  padding: 140px 0;
  background-image: url("./assets/visuals/cta-background.png");
  background-size: cover;
  background-position: center;
  text-align: center;
}
.cta-overlay { position: absolute; inset: 0; background: rgba(8, 6, 15, 0.55); }
.cta-inner { position: relative; z-index: 1; }
.cta-inner h2 { font-size: clamp(32px, 4.6vw, 52px); margin-bottom: 20px; }
.cta-lines { color: var(--text); font-size: 17px; margin-bottom: 36px; opacity: 0.92; }
.cta-lines span { margin: 0 6px; }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.contact-card { text-align: center; padding: 32px 24px; display: block; }
.ct-ico {
  width: 44px; height: 44px; border-radius: 10px; margin: 0 auto 14px;
  background: rgba(139, 92, 246, 0.12); color: var(--primary-bright);
  display: flex; align-items: center; justify-content: center;
}
.ct-ico svg { width: 22px; height: 22px; }
.contact-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.contact-card p { color: var(--text-muted); font-size: 14.5px; }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 14px; }
.faq-item { padding: 0; overflow: hidden; }
.faq-item:hover { transform: none; box-shadow: none; }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 22px 28px;
  font-size: 16px; font-weight: 600; color: var(--text); text-align: left;
  font-family: var(--font-body);
}
.faq-icon { position: relative; width: 18px; height: 18px; flex: none; }
.faq-icon::before, .faq-icon::after {
  content: ""; position: absolute; left: 50%; top: 50%;
  background: var(--primary-bright); border-radius: 2px;
  transition: transform 0.35s ease;
}
.faq-icon::before { width: 16px; height: 2px; transform: translate(-50%, -50%); }
.faq-icon::after { width: 2px; height: 16px; transform: translate(-50%, -50%); }
.faq-item.open .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-item.open .faq-icon::before { transform: translate(-50%, -50%) rotate(180deg); }
.faq-a { max-height: 0; transition: max-height 0.4s ease; }
.faq-a p { padding: 0 28px 22px; color: var(--text-muted); font-size: 15px; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--glass-border); background: var(--bg-alt); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand img { height: 32px; width: auto; margin-bottom: 16px; filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.25)); }
.footer-brand p { color: var(--text-muted); font-size: 14px; max-width: 320px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: var(--text-muted); font-size: 14px; transition: color 0.2s; }
.footer-links a:hover { color: var(--primary-bright); }
.footer-mail { text-align: right; }
.footer-mail a { color: var(--text); font-size: 15px; font-weight: 500; }
.footer-mail a:hover { color: var(--primary-bright); }
.footer-bottom { border-top: 1px solid rgba(167, 139, 250, 0.12); padding-top: 24px; }
.footer-bottom p { color: var(--text-muted); font-size: 13px; text-align: center; }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-visual img { animation: none; }
  .hub-core { animation: none; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ---------- responsive ---------- */
@media (max-width: 1023px) {
  .section { padding: 80px 0; }
  .hero { padding-top: 140px; }
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { max-width: 640px; }
  .ai-grid { grid-template-columns: repeat(2, 1fr); }
  .problem-grid, .conv-grid, .ci-grid, .pricing-grid { grid-template-columns: 1fr; gap: 48px; }
  .iceberg-wrap { order: -1; }
  .hub { grid-template-columns: 1fr; gap: 20px; }
  .hub-core-wrap { padding: 30px 0; }
  .hub-line { display: none; }
  .channel-card { justify-content: flex-start; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-mail { text-align: left; }
}

@media (max-width: 767px) {
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .hero { padding-top: 120px; padding-bottom: 64px; }

  .nav-links {
    position: fixed; top: 72px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--glass-border);
    max-height: 0; overflow: hidden;
    transition: max-height 0.35s ease;
  }
  .nav-links.open { max-height: 320px; }
  .nav-links a { padding: 15px 24px; border-top: 1px solid rgba(167, 139, 250, 0.1); }
  .nav-burger { display: flex; }
  .nav-cta { display: none; }

  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 28px 16px; margin-top: 56px; }
  .ai-grid, .case-grid, .model-grid, .temple-pillars, .contact-grid, .module-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .big-stat-card { flex-direction: column; align-items: flex-start; gap: 10px; }
  .ice-label { white-space: normal; width: max-content; max-width: 86%; }
  .hub { display: none; }
  .hub-list-mobile {
    display: flex; flex-direction: column; gap: 10px;
    max-width: 420px; margin: 0 auto;
  }
  .hub-list-mobile li {
    border: 1px solid var(--glass-border); background: var(--glass);
    border-radius: 12px; padding: 14px 20px;
    font-size: 14.5px; font-weight: 500; color: var(--text-muted);
  }
  .loop-nodes { flex-direction: column; }
  .loop-arrow { transform: rotate(90deg); margin: 0; }
  .loop-return { display: none; }
  .sec-layer { width: 100% !important; }
  .milestones li { flex-direction: column; gap: 2px; }
  .ms-month { width: auto; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .cta-final { padding: 96px 0; }
  .bundle-bar { flex-direction: column; text-align: center; }
}