/* =====================================================================
   Thirdhour — a Kanstar company
   main.css  ·  IBM Carbon Design System–inspired enterprise theme
   IBM Plex Sans (CDN) · #0F62FE primary · flat surfaces · datasheet tables
   Light only (#FFFFFF background) — locked regardless of OS preference.
   ===================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');

/* ---------- 1. 设计令牌 (Design tokens) ---------- */
:root {
  --font: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
          'Helvetica Neue', Arial, 'Noto Sans', sans-serif;

  /* 品牌色 */
  --blue: #0F62FE;          /* IBM Blue — 按钮/强调 */
  --blue-hover: #0043CE;
  --blue-active: #002D9C;
  --blue-light: #0043CE;    /* light 表面上的可读强调蓝（深一点保证对比） */

  /* 语义色（仅真实警示/状态，不作装饰） */
  --green: #198038;         /* 成功 */
  --red: #DA1E28;           /* 警示/错误 */
  --amber: #B28600;         /* 待确认 Pending confirmation（深琥珀，在白底可读） */

  /* 浅色模式（唯一） */
  color-scheme: light;      /* 浏览器原生 UI 用浅色：表单、滚动条、placeholder */
  --bg: #FFFFFF;
  --surface: #F4F4F4;
  --surface-2: #E0E0E0;
  --line: #E0E0E0;
  --line-strong: #8D8D8D;
  --text: #161616;
  --muted: #525252;
  --link: #0F62FE;
  --link-hover: #0043CE;
  --on-blue: #FFFFFF;
  --focus: #0F62FE;

  /* 形态 */
  --radius: 8px;            /* 卡片微圆角 */
  --radius-sm: 4px;         /* 按钮/表单/标签 — 方角微圆 */
  --maxw: 1200px;
  --nav-h: 64px;

  --shadow: 0 2px 8px rgba(22, 22, 22, 0.10);
  --shadow-lg: 0 6px 20px rgba(22, 22, 22, 0.14);
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { padding: 0; margin: 0; list-style: none; }
h1, h2, h3, h4, h5, p { margin: 0; }

/* 编辑级标题：紧凑字距、高对比、企业严谨感 */
h1, h2, h3, h4, h5 {
  letter-spacing: -0.01em;
  line-height: 1.16;
  font-weight: 600;
}
h1, h2 { letter-spacing: -0.03em; font-weight: 600; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- 3. 通用工具 ---------- */
.container {
  width: min(var(--maxw), 92%);
  margin-inline: auto;
}

.section {
  padding-block: clamp(3.5rem, 7vw, 5.5rem);
  position: relative;
}

/* 视口外隐藏（无障碍） */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* 段落小标题 eyebrow */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--blue);
  font-family: var(--font);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--blue);
}
.eyebrow::after { content: none; }

.section-title {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  margin-top: 0.7rem;
  max-width: 24ch;
}

.section-lead {
  color: var(--muted);
  max-width: 62ch;
  margin-top: 0.9rem;
  font-size: 1.02rem;
}

/* 居中标题块（保留结构性居中，内文仍以卡片左对齐为主） */
.center { text-align: center; }
.center .section-lead { margin-inline: auto; }
.center .section-title { margin-inline: auto; }

.section-head { margin-bottom: 2.4rem; }
.center.section-head { text-align: center; }
.gap-lg { gap: 2rem !important; }
.mt-lg { margin-top: 2.2rem; }

/* ---------- 4. 栅格系统 ---------- */
.grid { display: grid; gap: 1.25rem; }
.grid-1 { grid-template-columns: repeat(1, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* ---------- 5. 导航栏 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand { display: flex; flex-direction: column; line-height: 1.1; margin-right: auto; }
.brand .brand-mark {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand .brand-mark span { color: var(--blue); }
.brand .brand-parent {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.nav-links { display: flex; align-items: center; gap: 1.3rem; }
.nav-links a {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 500;
  transition: color 0.16s ease;
  position: relative;
  padding-block: 4px;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after,
.nav-links a.is-active::after { transform: scaleX(1); }
.nav-links a.is-active { color: var(--text); }

.nav-links a.btn-primary {
  color: var(--on-blue) !important;
}

/* 导航内 CTA 按钮（收紧以适配高度） */
.nav .btn { padding: 0.5rem 0.9rem; font-size: 0.84rem; }

/* 菜单切换按钮（移动端） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
}
.nav-toggle span {
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.22s ease, opacity 0.22s ease;
}
body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 6. 按钮（IBM 实色方角 + 点击涟漪） ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.75rem 1.1rem;
  min-height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  overflow: hidden;
  transition: background 0.16s ease, border-color 0.16s ease,
              color 0.16s ease, box-shadow 0.16s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--blue);
  color: var(--on-blue);
}
.btn-primary:hover { background: var(--blue-hover); }
.btn-primary:active { background: var(--blue-active); }

.btn-ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--text);
}
.btn-ghost:hover { background: var(--surface-2); border-color: var(--line-strong); }

/* 按钮点击涟漪（CSS-only，中心扩散） */
.btn::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 16px; height: 16px;
  margin: -8px 0 0 -8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.28);
  transform: scale(0);
  opacity: 0;
  pointer-events: none;
}
.btn-primary::after { background: rgba(255, 255, 255, 0.30); }
.btn-ghost::after { background: rgba(22, 22, 22, 0.16); }
.btn:active::after { animation: btn-ripple 0.45s ease-out; }
@keyframes btn-ripple {
  0%   { transform: scale(0);  opacity: 0.9; }
  100% { transform: scale(16); opacity: 0; }
}

/* ---------- 7. Hero（移除粒子背景，纯色企业级） ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
/* Hero 粒子背景：light theme 下保持启用（节点 + 连线在白底可见） */
.hero-canvas { display: block !important; opacity: 0.85; }

.hero-inner {
  position: relative;
  z-index: 2;
  padding-block: 3rem 5rem;
}
.hero-inner h1 {
  font-size: clamp(2rem, 5.6vw, 3.6rem);
  letter-spacing: -0.035em;
  max-width: 18ch;
  margin-top: 1.1rem;
}
.hero-sub {
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.15rem);
  max-width: 58ch;
  margin-top: 1.1rem;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2rem; }
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 1.1rem 2rem;
  color: var(--muted); font-size: 0.88rem; margin-top: 2.4rem;
}
.hero-meta b { color: var(--text); font-weight: 600; }
.hero-meta span { display: inline-flex; align-items: center; gap: 0.4rem; }
.hero-meta .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); }

/* 仅用于 AI Agents hero 的价格行 */
.hero-price { margin-top: 1.6rem; }
.hero-price .hp-line {
  display: inline-flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
  font-size: 1rem; color: var(--muted);
}
.hero-price .hp-line b { color: var(--text); font-weight: 600; }
.hero-price .hp-sep { color: var(--muted); }

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  left: 50%; bottom: 1.4rem;
  transform: translateX(-50%);
  z-index: 2;
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}
.scroll-hint::after {
  content: "";
  width: 1px; height: 32px;
  background: var(--line-strong);
}

/* 打字机光标（简化为蓝色竖线，无辉光） */
.typewriter::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 0.9em;
  margin-left: 3px;
  vertical-align: -0.12em;
  background: var(--blue);
  animation: caret 1s steps(1) infinite;
}
.typewriter.is-done::after { animation: none; opacity: 0; }
@keyframes caret { 50% { opacity: 0; } }

/* 标题：去掉渐变流光，改为纯色强调 */
.gradient-text {
  background: none;
  -webkit-background-clip: initial;
  background-clip: initial;
  -webkit-text-fill-color: currentColor;
  color: var(--text);
  animation: none;
}

/* 光标光晕（鼠标跟随）禁用 */
.glow { display: none !important; }

/* ---------- 8. 服务联动条 & AI Agent 元信息条 ---------- */
.service-strip {
  position: relative;
  z-index: 90;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.service-strip-inner {
  display: flex; align-items: center; gap: 0.8rem;
  padding-block: 0.6rem;
  font-size: 0.88rem; color: var(--muted);
}
.service-strip .ss-ico {
  display: grid; place-items: center;
  width: 30px; height: 30px; flex: 0 0 auto;
  border-radius: var(--radius-sm);
  color: var(--blue);
  background: color-mix(in srgb, var(--blue) 14%, transparent);
}
.service-strip .ss-ico svg { width: 18px; height: 18px; }
.service-strip .ss-text { flex: 1 1 auto; }
.service-strip .ss-text b { color: var(--text); }
.service-strip .ss-link {
  display: inline-flex; align-items: center; gap: 0.3rem;
  color: var(--link); font-weight: 600; white-space: nowrap;
}
.service-strip .ss-link svg { width: 15px; height: 15px; transition: transform 0.2s ease; }
.service-strip .ss-link:hover svg { transform: translateX(3px); }

/* AI Agents 独立 sticky 元信息条 */
.agent-svc-bar {
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.agent-svc-inner {
  display: flex; align-items: center; gap: 0.9rem; flex-wrap: wrap;
  padding-block: 0.7rem;
  font-size: 0.88rem; color: var(--muted);
}
.agent-svc-inner .asb-ico {
  display: grid; place-items: center;
  width: 28px; height: 28px; flex: 0 0 auto;
  border-radius: var(--radius-sm);
  color: var(--blue);
  background: color-mix(in srgb, var(--blue) 14%, transparent);
}
.agent-svc-inner .asb-ico svg { width: 16px; height: 16px; }
.agent-svc-inner .asb-name { font-weight: 600; color: var(--text); white-space: nowrap; }
.agent-svc-inner .asb-name b { color: var(--blue); font-weight: 600; }
.agent-svc-inner .asb-sep { width: 1px; height: 18px; background: var(--line-strong); }
.agent-svc-inner .asb-tag {
  color: var(--blue); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.72rem;
}
.agent-svc-inner .asb-price { margin-left: auto; white-space: nowrap; }
.agent-svc-inner .asb-price b { color: var(--text); font-weight: 600; }
.agent-svc-inner .asb-arrow { color: var(--blue); margin-inline: 0.3rem; }
.agent-svc-inner .asb-link {
  color: var(--link); font-weight: 600; text-decoration: underline; text-underline-offset: 3px;
}

/* 价格锚点条（AI Agents 价格区） */
.price-anchor {
  display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.6rem;
  padding: 1.3rem 1.4rem;
  border: 1px solid var(--line);
  background: var(--surface);
  margin-bottom: 2rem;
}
.price-anchor .pa-label {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); font-weight: 600;
}
.price-anchor .pa-range { display: inline-flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; font-size: 1rem; }
.price-anchor .pa-range b { color: var(--text); font-weight: 600; }
.price-anchor .pa-arrow { color: var(--blue); }
.price-anchor .pa-link { margin-left: auto; }

/* ---------- 9. 卡片基础（方角 + 1px 边框 + hover 边框/阴影微交互） ---------- */
.series-card, .product-card, .featured-card, .reason-card, .signal-card,
.tier-card, .start-card, .principle, .metric, .uc-card, .start-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: visible; /* tilt removed, no longer needed */
}

/* 隐藏旧 3D tilt 光泽层 */
.tilt-glare { display: none !important; }
/* 解除 JS 内联 3D tilt（保留 hover 边框+阴影，不用 transform） */
.tilt, .featured-card, .product-card {
  transform: none !important;
  will-change: auto;
}

/* 通用卡片 hover 微交互（强度低，企业感） */
.series-card:hover, .product-card:hover, .featured-card:hover,
.reason-card:hover, .signal-card:hover, .tier-card:hover,
.start-card:hover, .principle:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-lg);
}

/* ---------- 10. 系列入口卡 & 产品卡 ---------- */
.series-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 1.7rem 1.6rem 1.9rem;
  overflow: hidden;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.series-card .sc-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent, var(--blue)) 14%, transparent);
  color: var(--accent, var(--blue));
  margin-bottom: 1rem;
}
.series-card .sc-icon svg { width: 24px; height: 24px; }
.series-card h3 { font-size: 1.3rem; margin-bottom: 0.45rem; }
.series-card p { color: var(--muted); font-size: 0.94rem; }
.series-card .sc-link {
  display: inline-flex; align-items: center; gap: 0.35rem;
  margin-top: 1.2rem;
  color: var(--accent, var(--blue));
  font-weight: 600; font-size: 0.9rem;
}
.series-card .sc-link svg { width: 16px; height: 16px; transition: transform 0.2s ease; }
.series-card:hover .sc-link svg { transform: translateX(3px); }
.series-card .sc-count {
  position: absolute;
  top: 1.4rem; right: 1.4rem;
  font-size: 0.7rem;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 0.18rem 0.55rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase; letter-spacing: 0.08em;
}

/* 产品卡 */
.product-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 1.7rem 1.7rem 1.9rem;
  overflow: hidden;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.product-card .tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--blue);
  border: 1px solid color-mix(in srgb, var(--blue) 40%, transparent);
  background: color-mix(in srgb, var(--blue) 10%, transparent);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}
.product-card h3 { font-size: 1.4rem; }
.product-card .category { color: var(--muted); font-size: 0.9rem; margin-top: 0.3rem; }
.product-price { margin-block: 1.1rem 0.2rem; }
.product-card .price-note {
  display: inline-block; margin-top: 0.35rem;
  font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--blue); border: 1px solid color-mix(in srgb, var(--blue) 40%, transparent);
  background: color-mix(in srgb, var(--blue) 10%, transparent);
  padding: 0.1rem 0.5rem; border-radius: var(--radius-sm);
}
.product-price .amount { font-size: 1.8rem; font-weight: 600; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.product-price .range { display: block; color: var(--muted); font-size: 0.85rem; margin-top: 0.15rem; }

.highlights {
  margin-block: 1rem 1.3rem;
  display: grid;
  gap: 0.5rem;
  overflow: visible;
}
.highlights li {
  position: relative;
  padding-left: 1.3rem;
  color: var(--muted);
  font-size: 0.92rem;
}
.highlights li::before {
  content: "";
  position: absolute; left: 0; top: 0.45em;
  width: 6px; height: 6px; border-radius: 1px;
  background: var(--green);
}
.highlights li.pending::before { background: var(--amber); }
/* 待确认高亮：整行为 amber（高于 .highlights li 的 specificity） */
.highlights li.pending,
.uc-list li.pending,
.tier-list li.pending { color: var(--amber); }
.spec-row dd .pending { color: var(--amber); }

/* 首页精选卡 */
.featured-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 1.5rem 1.5rem 1.7rem;
  overflow: hidden;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.featured-card .series-dot { width: 9px; height: 9px; border-radius: 2px; display: inline-block; margin-bottom: 0.6rem; }
.featured-card .series-name {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.14em;
  font-weight: 600; margin-bottom: 0.4rem;
}
.featured-card h3 { font-size: 1.25rem; }
.featured-card .fc-price { margin-top: 0.6rem; font-size: 1.1rem; font-weight: 600; }
.featured-card .fc-range { font-size: 0.8rem; color: var(--muted); font-weight: 400; }
.featured-card .fc-cat { color: var(--muted); font-size: 0.85rem; margin-top: 0.3rem; }
.featured-card .fc-tag {
  display: inline-flex; align-items: center; gap: 0.3rem;
  margin-top: 0.7rem; align-self: flex-start;
  font-size: 0.7rem; color: var(--blue); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600;
  border: 1px solid color-mix(in srgb, var(--blue) 40%, transparent);
  background: color-mix(in srgb, var(--blue) 10%, transparent);
  padding: 0.2rem 0.55rem; border-radius: var(--radius-sm);
}
.featured-card .more {
  margin-top: auto; padding-top: 0.9rem;
  color: var(--link); font-weight: 600; font-size: 0.9rem;
  display: inline-flex; align-items: center;
}
.featured-card .more::after { content: "→"; margin-left: 0.35rem; transition: transform 0.2s ease; }
.featured-card:hover .more::after { transform: translateX(3px); }

/* ---------- 11. 规格表 / 数据表（datasheet 风格） ---------- */
.spec-list {
  margin-block: 0.4rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.spec-row {
  display: grid;
  grid-template-columns: 0.95fr 1.4fr;
  gap: 0.6rem;
  padding: 0.6rem 0.9rem;
  font-size: 0.87rem;
  border-bottom: 1px solid var(--line);
}
.spec-row:last-child { border-bottom: 0; }
.spec-row:nth-child(even) { background: var(--surface); }
.spec-row dt { color: var(--muted); font-weight: 500; }
.spec-row dd { color: var(--text); }

/* 表格通用（对比表 / 附加服务表）：方角、1px 边框、上标头 */
.compare-wrap, .addon-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); }
.compare, .addons {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  background: var(--bg);
}
.compare th, .compare td, .addons th, .addons td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  font-size: 0.89rem;
}
.compare thead th, .addons thead th {
  background: var(--surface-2);
  color: var(--text);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.compare tbody td, .addons tbody td { color: var(--muted); }
.compare tbody td:first-child { color: var(--text); font-weight: 500; }
.compare tbody tr, .addons tbody tr { transition: background 0.16s ease; }
.compare tbody tr:hover, .addons tbody tr:hover { background: var(--surface); }
.compare tbody tr:hover td, .addons tbody tr:hover td { color: var(--text); }
.addons .addon-name { color: var(--text); font-weight: 500; }
.addons .addon-price { color: var(--text); white-space: nowrap; }
.addons .addon-note { color: var(--muted); }

/* 数据 / 待确认说明条 */
.spec-note {
  margin-top: 1.2rem;
  font-size: 0.82rem;
  color: var(--muted);
  border-left: 3px solid var(--amber);
  background: color-mix(in srgb, var(--amber) 8%, transparent);
  padding: 0.7rem 0.9rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ---------- 12. 徽章 / 标签（Pending confirmation 等） ---------- */
.pending {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--amber);
  border: 1px solid color-mix(in srgb, var(--amber) 60%, transparent);
  background: color-mix(in srgb, var(--amber) 12%, transparent);
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-sm);
  vertical-align: middle;
  margin-left: 0.35rem;
  white-space: nowrap;
}
.pending::before { content: ""; width: 6px; height: 6px; border-radius: 1px; background: currentColor; }

/* ---------- 13. 数据面板 / 指标 ---------- */
.metric {
  position: relative;
  padding: 1.6rem 1.5rem;
  display: flex; flex-direction: column; align-items: flex-start;
  text-align: left;
  border-radius: var(--radius);
}
.metric .metric-num {
  font-size: clamp(2.2rem, 4.5vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}
.metric .metric-label { color: var(--muted); margin-top: 0.5rem; font-size: 0.94rem; }
.metric .metric-note {
  display: inline-block;
  margin-top: 0.8rem;
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--amber);
  border: 1px solid color-mix(in srgb, var(--amber) 60%, transparent);
  background: color-mix(in srgb, var(--amber) 10%, transparent);
  padding: 0.16rem 0.55rem;
  border-radius: var(--radius-sm);
}

/* ---------- 14. 系统拓扑（工程图质感，去除辉光） ---------- */
.topology-wrap {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1.5rem;
  overflow: hidden;
}
.topology { width: 100%; height: auto; display: block; }
.topology .tp-link {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 2;
  opacity: 0.8;
  stroke-dasharray: 8 7;
}
.topology .tp-link.tp-blue { stroke: var(--blue); }
.topology .tp-link.tp-teal { stroke: var(--green); }
.topology .tp-teal { stroke: var(--green); color: var(--green); }
.topology .tp-blue { stroke: var(--blue); color: var(--blue); }
.topology .tp-cloud { stroke: var(--muted); color: var(--muted); }
.topology .tp-label { font-size: 15px; font-weight: 600; fill: var(--text); }
.topology .tp-sub { font-size: 11px; fill: var(--muted); }

.topology .tp-node rect,
.topology .tp-center rect {
  fill: var(--surface);
  stroke: var(--line-strong);
  stroke-width: 1;
}
.topology .tp-center rect {
  fill: var(--surface-2);
  stroke: var(--blue);
  stroke-width: 1.5;
}
.topology .tp-node rect:hover { stroke: var(--blue); }

.topology .node-glow, .topology .center-fill { animation: none; }
.topology .topo-dot { filter: none; }

/* Powered by 标签 */
.topo-powered {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.7rem;
  margin-top: 1.3rem; padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}
.topo-powered-label {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--muted); font-weight: 600; margin-right: 0.3rem;
}
.topo-chip {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--text); font-size: 0.85rem; font-weight: 500;
  transition: border-color 0.16s ease;
}
.topo-chip:hover { border-color: var(--blue); }
.topo-chip .chip-dot { width: 8px; height: 8px; border-radius: 2px; }

/* ---------- 15. 流程步骤 ---------- */
.process { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem; position: relative; }
.process .step {
  position: relative;
  padding: 1.3rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.process .step:hover { border-color: var(--line-strong); box-shadow: var(--shadow); }
.process .step .num {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: var(--blue);
  background: color-mix(in srgb, var(--blue) 14%, transparent);
  margin-bottom: 0.8rem;
  font-variant-numeric: tabular-nums;
}
.process .step h4 { font-size: 1.02rem; }
.process .step p { color: var(--muted); font-size: 0.85rem; margin-top: 0.4rem; }

/* 时间线流程（AI Agents 交付） */
.process--timeline .step::after {
  content: ""; position: absolute; right: -0.6rem; top: 50%;
  width: 0.5rem; height: 2px; background: var(--line-strong);
  transform: translateY(-50%);
}
.process--timeline .step:last-child::after { display: none; }
.process--timeline .num { background: color-mix(in srgb, var(--green) 14%, transparent); color: var(--green); }

/* ---------- 16. FAQ ---------- */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  margin-bottom: 0.9rem;
  overflow: hidden;
}
.faq-q {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1.05rem 1.2rem;
  background: transparent;
  border: 0;
  color: var(--text);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}
.faq-q::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--blue);
  transition: transform 0.2s ease;
}
.faq-item[open] .faq-q::after { transform: rotate(45deg); }
.faq-a { padding: 0 1.2rem 1.2rem; color: var(--muted); font-size: 0.94rem; }
.faq-a p { margin: 0; }

/* ---------- 17. 联系页表单 ---------- */
.contact-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 2.5rem; align-items: start; }
.form { display: grid; gap: 1.1rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field { display: grid; gap: 0.4rem; }
.field label { font-size: 0.85rem; color: var(--muted); font-weight: 500; }
.field label em { color: var(--red); font-style: normal; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
  font-family: var(--font);
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--blue) 25%, transparent);
}
.field textarea { resize: vertical; min-height: 120px; }
.field .err { color: var(--red); font-size: 0.78rem; display: none; }
.field.has-error input,
.field.has-error select,
.field.has-error textarea { border-color: var(--red); }
.field.has-error .err { display: block; }

/* GDPR 同意 */
.consent { display: flex; gap: 0.7rem; align-items: flex-start; font-size: 0.86rem; color: var(--muted); }
.consent input { margin-top: 0.25rem; width: 18px; height: 18px; accent-color: var(--blue); }
.consent a { color: var(--link); text-decoration: underline; }

/* 表单状态 */
.form-status { font-size: 0.9rem; border-radius: var(--radius-sm); padding: 0.9rem 1rem; display: none; }
.form-status.is-success { display: block; background: color-mix(in srgb, var(--green) 12%, transparent); border: 1px solid var(--green); color: var(--green); }
.form-status.is-error { display: block; background: color-mix(in srgb, var(--red) 12%, transparent); border: 1px solid var(--red); color: var(--red); }
.form-status.is-info { display: block; background: color-mix(in srgb, var(--blue) 12%, transparent); border: 1px solid color-mix(in srgb, var(--blue) 40%, transparent); color: var(--blue); }
.form-status a { color: inherit; font-weight: 600; }

/* 联系信息卡 */
.link-card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.link-card h3 { font-size: 1.1rem; margin-bottom: 1rem; }
.link-card dl { display: grid; gap: 0.9rem; margin: 0; }
.link-card dt { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.link-card dd { font-size: 0.95rem; color: var(--text); margin: 0.15rem 0 0; }
.link-card a { color: var(--link); }

/* ---------- 18. 决策卡 / 原则 / 主张 / 信号卡 / 用例 / 收费 / 起步 ---------- */
.reason-card { padding: 1.7rem 1.5rem; transition: border-color 0.16s ease, box-shadow 0.16s ease; }
.reason-card .ri-ico, .principle .pr-ico, .prop .pr-ico {
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  color: var(--blue);
  background: color-mix(in srgb, var(--blue) 14%, transparent);
  margin-bottom: 1rem;
}
.reason-card .ri-ico svg, .principle .pr-ico svg, .prop .pr-ico svg { width: 24px; height: 24px; }
.reason-card h3, .prop h3 { font-size: 1.12rem; margin-bottom: 0.4rem; }
.reason-card p, .prop p { color: var(--muted); font-size: 0.92rem; }

/* 主张（AI Agents "What it is" 4 列） */
.prop-grid { gap: 1rem; }
.prop {
  display: flex; flex-direction: column; align-items: flex-start;
  padding: 1.4rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-align: left;
}
.prop .pr-ico { margin-bottom: 0.9rem; }

/* 治理原则 */
.principles-grid { gap: 1.1rem; }
.principle {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: 1.4rem 1.4rem;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.principle .pr-ico { flex: 0 0 auto; margin-bottom: 0; color: var(--green); background: color-mix(in srgb, var(--green) 14%, transparent); }
.principle h3 { font-size: 1.1rem; margin-bottom: 0.35rem; }
.principle p { color: var(--muted); font-size: 0.9rem; }

/* 首页服务信号卡 */
.signal-grid { gap: 1.1rem; }
.signal-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 1.3rem 1.3rem 1.4rem;
  overflow: hidden;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.signal-card .sc-icon {
  width: 42px; height: 42px; border-radius: var(--radius-sm);
  display: grid; place-items: center;
  color: var(--blue);
  background: color-mix(in srgb, var(--blue) 14%, transparent);
  margin-bottom: 0.9rem;
}
.signal-card .sc-icon svg { width: 22px; height: 22px; }
.signal-card .signal-level {
  align-self: flex-start;
  font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600;
  color: var(--blue);
  border: 1px solid color-mix(in srgb, var(--blue) 40%, transparent);
  background: color-mix(in srgb, var(--blue) 10%, transparent);
  padding: 0.18rem 0.55rem; border-radius: var(--radius-sm);
  margin-bottom: 0.7rem;
}
.signal-card h3 { font-size: 1.1rem; }
.signal-card p { color: var(--muted); font-size: 0.88rem; margin-top: 0.4rem; }
.signal-card .signal-price { margin-top: auto; padding-top: 0.9rem; font-weight: 600; color: var(--text); font-size: 0.95rem; }

/* 首页服务信号带 */
.agent-signal-band {
  margin-top: 2rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1.6rem;
  flex-wrap: wrap;
  padding: 1.6rem 1.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.agent-signal-band .asb-left { display: flex; flex-wrap: wrap; align-items: center; gap: 0.9rem 1.2rem; }
.agent-signal-band .asb-price { font-size: 1rem; color: var(--muted); }
.agent-signal-band .asb-price b { color: var(--text); font-size: 1.5rem; font-weight: 600; letter-spacing: -0.03em; }
.agent-signal-band .asb-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--amber);
  border: 1px solid color-mix(in srgb, var(--amber) 60%, transparent);
  background: color-mix(in srgb, var(--amber) 12%, transparent);
  padding: 0.34rem 0.7rem; border-radius: var(--radius-sm);
}
.agent-signal-band .pilot-dot { width: 7px; height: 7px; border-radius: 2px; background: var(--amber); }
.agent-signal-band .asb-left p { width: 100%; color: var(--muted); font-size: 0.9rem; margin: 0; }
.agent-signal-band .asb-cta { display: flex; flex-wrap: wrap; gap: 0.7rem; }

/* 用例卡（accordion） */
.uc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.grid-2.uc-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.uc-card {
  position: relative;
  overflow: hidden;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.uc-card.is-open { border-color: var(--blue); box-shadow: var(--shadow-lg); }
.uc-head {
  display: grid; grid-template-columns: auto 1fr auto; align-items: start; gap: 1rem;
  width: 100%; padding: 1.5rem 1.5rem 1.4rem;
  background: transparent; border: 0; cursor: pointer; text-align: left;
  color: var(--text); font-family: var(--font);
}
.uc-head .uc-icon {
  width: 48px; height: 48px; border-radius: var(--radius-sm); flex: 0 0 auto;
  display: grid; place-items: center;
  color: var(--blue);
  background: color-mix(in srgb, var(--blue) 14%, transparent);
}
.uc-head .uc-icon svg { width: 24px; height: 24px; }
.uc-body { display: block; min-width: 0; }
.uc-top { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.7rem; margin-bottom: 0.5rem; }
.uc-level {
  font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600;
  color: var(--blue);
  border: 1px solid color-mix(in srgb, var(--blue) 40%, transparent);
  background: color-mix(in srgb, var(--blue) 10%, transparent);
  padding: 0.16rem 0.5rem; border-radius: var(--radius-sm);
}
.uc-time { display: inline-flex; align-items: center; gap: 0.32rem; font-size: 0.8rem; color: var(--muted); }
.uc-time svg { width: 15px; height: 15px; }
.uc-body h3 { font-size: 1.12rem; }
.uc-desc { color: var(--muted); font-size: 0.9rem; margin-top: 0.4rem; }
.uc-price { display: inline-block; margin-top: 0.7rem; font-weight: 600; font-size: 0.92rem; color: var(--text); }
.uc-chev { align-self: center; color: var(--blue); transition: transform 0.2s ease; }
.uc-chev svg { width: 22px; height: 22px; display: block; }
.uc-card.is-open .uc-chev { transform: rotate(180deg); }
.uc-panel {
  max-height: 0; overflow: hidden; opacity: 0;
  padding: 0 1.5rem;
  transition: max-height 0.4s cubic-bezier(0.16, 0.8, 0.3, 1), opacity 0.2s ease;
}
.uc-card.is-open .uc-panel { max-height: 2000px; opacity: 1; padding-top: 0.1rem; padding-bottom: 1.5rem; border-top: 1px solid var(--line); }
.uc-group h4 { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--blue); margin-bottom: 0.6rem; }
.uc-list { display: grid; gap: 0.4rem; }
.uc-list li { position: relative; padding-left: 1.1rem; color: var(--muted); font-size: 0.87rem; }
.uc-list li::before { content: ""; position: absolute; left: 0; top: 0.45em; width: 5px; height: 5px; border-radius: 1px; background: var(--blue); }
.uc-approval {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.8rem;
  margin-top: 1.1rem; padding: 0.9rem 1rem;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--amber) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--amber) 35%, transparent);
}
.uc-approval-tag {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--amber); white-space: nowrap;
}
.uc-approval-tag svg { width: 18px; height: 18px; }
.uc-approval p { color: var(--muted); font-size: 0.88rem; }
.uc-kpis { margin-top: 1.1rem; }
.uc-kpis h4 { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--green); margin-bottom: 0.6rem; }
.uc-kpis .uc-list li::before { background: var(--green); }

/* 收费卡（5 级） */
.tier-grid { gap: 1.2rem; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.tier-card {
  display: flex; flex-direction: column;
  padding: 1.7rem 1.6rem;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.tier-highlight {
  border-color: var(--blue);
  box-shadow: inset 0 3px 0 var(--blue), var(--shadow);
}
.tier-top { display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; }
.tier-card h3 { font-size: 1.25rem; }
.tier-tag {
  font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700;
  color: var(--blue);
  border: 1px solid color-mix(in srgb, var(--blue) 50%, transparent);
  background: color-mix(in srgb, var(--blue) 10%, transparent);
  padding: 0.22rem 0.6rem; border-radius: var(--radius-sm); white-space: nowrap;
}
.tier-highlight .tier-tag { background: var(--blue); color: #fff; border-color: var(--blue); }
.tier-price { margin-block: 1rem 0.3rem; }
.tier-price .amount { font-size: 1.9rem; font-weight: 600; letter-spacing: -0.03em; display: block; font-variant-numeric: tabular-nums; }
.tier-price .unit { color: var(--muted); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; }
.tier-time { display: inline-flex; align-items: center; gap: 0.4rem; color: var(--muted); font-size: 0.85rem; margin-top: 0.4rem; }
.tier-time svg { width: 15px; height: 15px; }
.tier-desc { color: var(--muted); font-size: 0.9rem; margin-top: 0.8rem; }
.tier-card h4 { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--blue); margin: 1.1rem 0 0.5rem; }
.tier-list { display: grid; gap: 0.5rem; margin-bottom: 1.4rem; }
.tier-list li { display: flex; align-items: flex-start; gap: 0.55rem; color: var(--muted); font-size: 0.9rem; }
.tier-list li svg { width: 16px; height: 16px; flex: 0 0 auto; color: var(--green); margin-top: 0.15rem; }
.tier-card .btn { margin-top: auto; }

/* 起步选项（3 项） */
.start-grid { gap: 1.2rem; }
.start-card { display: flex; flex-direction: column; padding: 1.6rem 1.5rem; transition: border-color 0.16s ease, box-shadow 0.16s ease; }
.start-tag {
  align-self: flex-start;
  font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700;
  color: var(--amber);
  border: 1px solid color-mix(in srgb, var(--amber) 60%, transparent);
  background: color-mix(in srgb, var(--amber) 12%, transparent);
  padding: 0.2rem 0.55rem; border-radius: var(--radius-sm);
  margin-bottom: 0.8rem;
}
.start-card h3 { font-size: 1.18rem; }
.start-price { font-size: 1.2rem; font-weight: 600; letter-spacing: -0.02em; color: var(--text); margin-top: 0.5rem; }
.start-card p { color: var(--muted); font-size: 0.9rem; margin-top: 0.5rem; }
.start-link {
  margin-top: auto; padding-top: 1rem;
  display: inline-flex; align-items: center; gap: 0.32rem;
  color: var(--link); font-weight: 600; font-size: 0.9rem;
}
.start-link svg { width: 16px; height: 16px; transition: transform 0.2s ease; }
.start-card:hover .start-link svg { transform: translateX(3px); }

/* ---------- 19. CTA 区块 ---------- */
.cta-band {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: clamp(2.5rem, 6vw, 4rem);
  text-align: left;
  overflow: hidden;
  border-left: 4px solid var(--blue);
}
.cta-band h2 { font-size: clamp(1.6rem, 4vw, 2.3rem); max-width: 22ch; }
.cta-band p { color: var(--muted); max-width: 58ch; margin: 0.8rem 0 1.8rem; }
.cta-band .hero-cta { justify-content: flex-start; }

/* ---------- 20. Footer ---------- */
.footer { position: relative; border-top: 1px solid var(--line); padding-block: 3.5rem 2rem; background: var(--bg); }
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr;
  gap: 2rem; padding-bottom: 2rem; border-bottom: 1px solid var(--line);
}
.footer .brand-mark { font-size: 1.25rem; }
.footer .footer-desc { color: var(--muted); font-size: 0.9rem; max-width: 42ch; margin-top: 0.8rem; }
.footer h5 { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); margin-bottom: 1rem; }
.footer-links a { display: block; color: var(--muted); font-size: 0.9rem; padding: 0.28rem 0; transition: color 0.16s ease; }
.footer-links a:hover { color: var(--link); }
.footer-sub { display: flex; flex-wrap: wrap; gap: 0.8rem 1.6rem; color: var(--muted); font-size: 0.82rem; padding-top: 1.5rem; justify-content: space-between; }
.footer-sub b { color: var(--text); }
.footer-addr { margin-top: 0.6rem; color: var(--muted); font-size: 0.84rem; letter-spacing: 0.01em; }

/* ---------- 21. Reveal-on-scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.16, 0.8, 0.3, 1);
  transition-delay: var(--d, 0s);
}
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 22. 移动端导航面板 ---------- */
@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    gap: 0.2rem;
    padding: 1rem 4%;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 0.22s ease, transform 0.22s ease;
  }
  body.nav-open .nav-links { opacity: 1; pointer-events: auto; transform: none; }
  .nav-links a { padding: 0.7rem 0; width: 100%; }
  .nav .btn { width: 100%; }
}

/* ---------- 23. 响应式 ---------- */
@media (max-width: 980px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .uc-grid, .grid-2.uc-grid { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .agent-svc-inner { gap: 0.6rem; }
  .agent-svc-inner .asb-price { margin-left: 0; width: 100%; }
}
@media (max-width: 700px) {
  .grid-2, .grid-3, .grid-4, .uc-grid, .grid-2.uc-grid { grid-template-columns: 1fr; }
  .process { grid-template-columns: 1fr; }
  .agent-signal-band { padding: 1.2rem 1.1rem; }
  .signal-grid { gap: 0.9rem; }
}
@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; }
  .hero-inner { padding-block: 2rem 4rem; }
  .price-anchor .pa-link { margin-left: 0; }
}
@media (max-width: 600px) {
  .service-strip-inner { font-size: 0.82rem; gap: 0.6rem; }
  .service-strip .ss-ico { width: 26px; height: 26px; }
}

/* ---------- 24. 减少动效 (prefers-reduced-motion) ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
  .typewriter::after { display: none; }
  .btn::after { display: none; }
  .gradient-text { animation: none; }
}