@charset "UTF-8";
/* ==========================================================================
   合肥聆依人工智能应用软件技术有限公司 — 官网样式
   纯静态，无任何外部依赖（无 CDN 字体、无图标库）
   目录：1 设计令牌 / 2 基础重置 / 3 通用组件 / 4 导航 / 5 Hero /
        6 章节通用 / 7 能力卡片 / 8 产品 / 9 架构 / 10 场景 /
        11 关于 / 12 联系与表单 / 13 页脚 / 14 响应式 / 15 无障碍与深色
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 品牌色 */
  --brand-1: #2E6BF5;
  --brand-2: #7A5CF0;
  --accent:  #FF8A4C;
  --teal:    #14B8A6;
  --grad-brand: linear-gradient(135deg, #2E6BF5 0%, #7A5CF0 100%);

  /* 深色区（Hero / 架构 / 联系 / 页脚）—— 恒定，不随主题变化 */
  --dark-1: #0B1229;
  --dark-2: #16214A;
  --dark-card: #111C3E;
  --dark-text: #E8EDFB;
  --dark-text-muted: #A9B8DF;
  --dark-border: rgba(255, 255, 255, .13);

  /* 浅色区 —— 随主题切换 */
  --bg: #FFFFFF;
  --bg-tint: #F5F8FF;
  --surface: #FFFFFF;
  --text: #12172B;
  --text-muted: #5A6480;
  --border: #E3E9F5;
  --shadow-sm: 0 2px 8px rgba(18, 30, 66, .05);
  --shadow-md: 0 10px 30px rgba(18, 30, 66, .08);
  --shadow-lg: 0 20px 50px rgba(18, 30, 66, .12);

  /* 尺寸 */
  --maxw: 1200px;
  --gutter: 24px;
  --radius: 16px;
  --radius-lg: 24px;
  --nav-h: 72px;

  /* 字体 */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { margin: 0; line-height: 1.28; font-weight: 700; letter-spacing: -.01em; }
p { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; }
li { list-style: none; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

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

.mono { font-family: var(--font-mono); font-size: .94em; letter-spacing: .02em; }
.grad {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 3. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}
.btn--primary {
  background: var(--grad-brand);
  color: #fff;
  box-shadow: 0 6px 18px rgba(46, 107, 245, .32);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(46, 107, 245, .42); }
.btn--ghost {
  background: rgba(255, 255, 255, .07);
  color: #fff;
  border-color: rgba(255, 255, 255, .26);
  backdrop-filter: blur(6px);
}
.btn--ghost:hover { background: rgba(255, 255, 255, .15); transform: translateY(-2px); }
.btn--sm { padding: 9px 20px; font-size: 14px; }
.btn--lg { padding: 14px 32px; font-size: 16px; }
.btn--block { width: 100%; }

.eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: #8FB0FF;
}
.eyebrow--dark { color: var(--brand-1); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  padding: 12px 20px;
  background: var(--brand-1);
  color: #fff;
  border-radius: 0 0 10px 0;
}
.skip-link:focus { left: 0; }

/* ---------- 4. 导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background .3s ease, box-shadow .3s ease, backdrop-filter .3s ease;
}
.nav.is-stuck {
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(14px);
  box-shadow: 0 1px 0 var(--border), var(--shadow-sm);
}
.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand__mark { display: block; line-height: 0; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__text strong { font-size: 19px; font-weight: 800; letter-spacing: .04em; color: #fff; }
.brand__text em {
  font-style: normal;
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(255, 255, 255, .62);
}
.nav.is-stuck .brand__text strong { color: var(--text); }
.nav.is-stuck .brand__text em { color: var(--text-muted); }

.nav__menu { display: flex; align-items: center; gap: 30px; }
.nav__menu > a:not(.btn) {
  position: relative;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, .84);
  padding: 6px 0;
  transition: color .2s ease;
}
.nav__menu > a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  border-radius: 2px;
  background: var(--grad-brand);
  transition: width .25s ease;
}
.nav__menu > a:not(.btn):hover,
.nav__menu > a.is-active { color: #fff; }
.nav__menu > a.is-active::after { width: 100%; }
.nav.is-stuck .nav__menu > a:not(.btn) { color: var(--text-muted); }
.nav.is-stuck .nav__menu > a:not(.btn):hover,
.nav.is-stuck .nav__menu > a.is-active { color: var(--brand-1); }

/* ---------- 4b. 导航「行业方案」分组 ----------
   注意：上面的 .nav__menu > a 是直接子选择器，匹配不到 .nav__group 里的 <a>，
   所以触发按钮的样式必须在这里单独写一份，保持与相邻导航项一致。 */
.nav__group { position: relative; }

.nav__group-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  position: relative;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, .84);
  padding: 6px 0;
  background: none;
  border: 0;
  cursor: pointer;
  transition: color .2s ease;
}
.nav__group-btn::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  border-radius: 2px;
  background: var(--grad-brand);
  transition: width .25s ease;
}
.nav__group-btn:hover,
.nav__group-btn[aria-expanded="true"] { color: #fff; }
.nav__group-btn[aria-expanded="true"]::after { width: 100%; }
.nav.is-stuck .nav__group-btn { color: var(--text-muted); }
.nav.is-stuck .nav__group-btn:hover,
.nav.is-stuck .nav__group-btn[aria-expanded="true"] { color: var(--brand-1); }

.nav__group-caret {
  width: 13px; height: 13px;
  transition: transform .25s ease;
}
.nav__group-btn[aria-expanded="true"] .nav__group-caret { transform: rotate(180deg); }

.nav__group-panel {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translate(-50%, -8px);
  min-width: 268px;
  padding: 8px;
  border-radius: 14px;
  background: rgba(11, 18, 41, .97);
  backdrop-filter: blur(16px);
  border: 1px solid var(--dark-border);
  box-shadow: 0 22px 60px rgba(0, 0, 0, .38);
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
/* 桥接导航项与面板之间的 14px 空隙，避免鼠标移过去时面板收起 */
.nav__group-panel::before {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: -14px; height: 14px;
}
.nav__group:hover .nav__group-panel,
.nav__group-btn[aria-expanded="true"] + .nav__group-panel {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.nav__group-panel a {
  display: block;
  padding: 11px 13px;
  border-radius: 10px;
  transition: background .2s ease;
}
.nav__group-panel a:hover { background: rgba(255, 255, 255, .07); }
.nav__group-panel strong {
  display: block;
  font-size: 14.5px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 2px;
}
.nav__group-panel span {
  display: block;
  font-size: 12.5px;
  color: rgba(255, 255, 255, .56);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
}
.nav__toggle span {
  display: block;
  height: 2px;
  width: 22px;
  margin: 0 auto;
  border-radius: 2px;
  background: #fff;
  transition: transform .28s ease, opacity .2s ease, background .3s ease;
}
.nav.is-stuck .nav__toggle span { background: var(--text); }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 5. Hero ---------- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100vh;
  min-height: 100svh;
  padding: calc(var(--nav-h) + 60px) 0 100px;
  background:
    radial-gradient(1100px 700px at 76% 18%, rgba(122, 92, 240, .30), transparent 62%),
    radial-gradient(900px 620px at 8% 82%, rgba(46, 107, 245, .26), transparent 62%),
    linear-gradient(165deg, #070C1D 0%, var(--dark-1) 38%, var(--dark-2) 100%);
  color: var(--dark-text);
  overflow: hidden;
}

/* 科技网格底纹 */
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(127, 168, 255, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(127, 168, 255, .055) 1px, transparent 1px);
  background-size: 62px 62px;
  /* 中心亮、边缘淡出，避免网格喧宾夺主 */
  -webkit-mask-image: radial-gradient(ellipse 78% 68% at 50% 45%, #000 35%, transparent 100%);
  mask-image: radial-gradient(ellipse 78% 68% at 50% 45%, #000 35%, transparent 100%);
  pointer-events: none;
}

/* 缓慢呼吸的光团 */
.hero__glow {
  position: absolute;
  top: -18%; right: -12%;
  width: 780px; height: 780px;
  background: radial-gradient(circle, rgba(76, 134, 255, .22) 0%, transparent 62%);
  filter: blur(46px);
  animation: heroGlow 13s ease-in-out infinite;
  pointer-events: none;
}
@keyframes heroGlow {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: .85; }
  50%      { transform: translate(-42px, 36px) scale(1.12); opacity: 1; }
}

/* 顶部扫描光带 */
.hero__scan {
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(102, 217, 232, .75), transparent);
  animation: heroScan 7s ease-in-out infinite;
  pointer-events: none;
}
@keyframes heroScan {
  0%   { transform: translateY(0);      opacity: 0; }
  12%  { opacity: 1; }
  88%  { opacity: 1; }
  100% { transform: translateY(100vh);  opacity: 0; }
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  align-items: center;
  gap: 48px;
  width: 100%;
}
.hero__title {
  font-size: clamp(42px, 6.2vw, 80px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.025em;
  margin-bottom: 26px;
  text-shadow: 0 6px 40px rgba(0, 0, 0, .4);
}

/* eyebrow 前置装饰线，增强层次 */
.eyebrow--line { display: inline-flex; align-items: center; gap: 12px; }
.eyebrow--line::before {
  content: "";
  width: 34px; height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, #66D9E8, #4C86FF);
}

/* 向下滚动提示 */
.hero__scroll {
  position: absolute;
  left: 50%; bottom: 30px;
  z-index: 1;
  width: 25px; height: 40px;
  margin-left: -12px;
  border: 1.5px solid rgba(255, 255, 255, .28);
  border-radius: 13px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.hero__scroll span {
  display: block;
  width: 3px; height: 7px;
  border-radius: 2px;
  background: #7FA8FF;
  animation: scrollDot 1.9s ease-in-out infinite;
}
@keyframes scrollDot {
  0%   { transform: translateY(0);   opacity: 0; }
  35%  { opacity: 1; }
  100% { transform: translateY(14px); opacity: 0; }
}
.hero__title .grad {
  background: linear-gradient(135deg, #6E9BFF 0%, #A78BFF 55%, #FFB088 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__lead {
  max-width: 560px;
  font-size: clamp(15px, 1.5vw, 17px);
  color: var(--dark-text-muted);
  margin-bottom: 34px;
}
.hero__lead strong { color: #fff; font-weight: 600; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 46px; }

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--dark-border);
}
.hero__stats dt {
  font-size: 25px;
  font-weight: 800;
  letter-spacing: -.01em;
  background: linear-gradient(135deg, #7FA8FF, #B49BFF);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__stats dt span { font-size: 15px; }
.hero__stats dd { font-size: 13.5px; color: var(--dark-text-muted); margin-top: 2px; }

.hero__art { display: flex; justify-content: center; align-items: center; }
.hero__svg {
  width: 100%;
  max-width: 620px;
  filter: drop-shadow(0 20px 60px rgba(46, 107, 245, .3));
}

/* --- SVG 动画 ---
   关键：SVG 元素默认以整个 viewBox 左上角为变换原点，
   直接写 transform-origin: center 会让缩放严重偏移（之前声波条被缩没就是这个原因）。
   transform-box: fill-box 把参照系限定到元素自身包围盒，才是正确写法。 */
.spectrum rect {
  transform-box: fill-box;
  transform-origin: center;
  animation: bar 1.6s ease-in-out infinite;
}
.spectrum rect:nth-child(1)  { animation-delay: 0s; }
.spectrum rect:nth-child(2)  { animation-delay: .1s; }
.spectrum rect:nth-child(3)  { animation-delay: .2s; }
.spectrum rect:nth-child(4)  { animation-delay: .3s; }
.spectrum rect:nth-child(5)  { animation-delay: .4s; }
.spectrum rect:nth-child(6)  { animation-delay: .5s; }
.spectrum rect:nth-child(7)  { animation-delay: .6s; }
.spectrum rect:nth-child(8)  { animation-delay: .7s; }
.spectrum rect:nth-child(9)  { animation-delay: .8s; }
.spectrum rect:nth-child(10) { animation-delay: .9s; }
@keyframes bar {
  0%, 100% { transform: scaleY(.42); opacity: .68; }
  50%      { transform: scaleY(1);   opacity: 1; }
}

.ring-slow { animation: spin 46s linear infinite; transform-origin: 310px 310px; }
.ring-rev  { animation: spin 34s linear infinite reverse; transform-origin: 310px 310px; }
.sweep     { animation: spin 8s linear infinite; transform-origin: 310px 310px; }
.orbit     { animation: spin 60s linear infinite; transform-origin: 310px 310px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* 节点脉冲 */
.node circle:first-child {
  transform-box: fill-box;
  transform-origin: center;
  animation: nodePulse 2.8s ease-in-out infinite;
}
.node:nth-child(2) circle:first-child { animation-delay: .7s; }
.node:nth-child(3) circle:first-child { animation-delay: 1.4s; }
.node:nth-child(4) circle:first-child { animation-delay: 2.1s; }
@keyframes nodePulse {
  0%, 100% { transform: scale(1);   opacity: .9; }
  50%      { transform: scale(1.4); opacity: 1; }
}

.chip { animation: float 5.2s ease-in-out infinite; }
.chip:nth-of-type(2) { animation-delay: 1.3s; }
.chip:nth-of-type(3) { animation-delay: 2.6s; }
.chip:nth-of-type(4) { animation-delay: 3.9s; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-11px); } }

.dash { animation: dash 1.4s linear infinite; }
@keyframes dash { to { stroke-dashoffset: -24; } }

.blink { animation: blink 2s ease-in-out infinite; }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: .25; } }

/* ---------- 6. 章节通用 ---------- */
.section { padding: 100px 0; background: var(--bg); }
.section--tint { background: var(--bg-tint); }
.section--dark {
  background: linear-gradient(165deg, var(--dark-1), var(--dark-2));
  color: var(--dark-text);
}

.sec-head { max-width: 760px; margin: 0 auto 58px; text-align: center; }
.sec-head h2 {
  font-size: clamp(27px, 3.4vw, 40px);
  margin-bottom: 16px;
}
.sec-head__lead { font-size: 16px; color: var(--text-muted); }
.sec-head--light h2 { color: #fff; }
.sec-head--light .sec-head__lead { color: var(--dark-text-muted); }

.grid { display: grid; gap: 24px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 7. 能力卡片 ---------- */
.card {
  padding: 34px 30px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(46, 107, 245, .32);
}
.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  margin-bottom: 20px;
  border-radius: 14px;
}
.card__icon svg { width: 26px; height: 26px; }
.card__icon--blue   { background: rgba(46, 107, 245, .11); color: var(--brand-1); }
.card__icon--purple { background: rgba(122, 92, 240, .11); color: var(--brand-2); }
.card__icon--teal   { background: rgba(20, 184, 166, .11);  color: var(--teal); }
.card__icon--orange { background: rgba(255, 138, 76, .13);  color: var(--accent); }
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--text-muted); }

/* ---------- 8. 产品 ---------- */
.product {
  display: grid;
  grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
  gap: 52px;
  align-items: start;
}
.product__visual {
  position: sticky;
  top: calc(var(--nav-h) + 32px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(76, 134, 255, .22);
  box-shadow: 0 24px 60px rgba(11, 18, 41, .28), 0 0 0 1px rgba(255, 255, 255, .04) inset;
}
.product__list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.product__list li {
  padding: 24px 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform .25s ease, box-shadow .25s ease;
}
.product__list li:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.product__list h3 {
  position: relative;
  font-size: 16px;
  margin-bottom: 8px;
  padding-left: 14px;
}
.product__list h3::before {
  content: "";
  position: absolute;
  left: 0; top: .25em; bottom: .25em;
  width: 3px;
  border-radius: 2px;
  background: var(--grad-brand);
}
.product__list p { font-size: 14px; color: var(--text-muted); }

/* ---------- 9. 架构 ---------- */
.arch {
  padding: 20px;
  background: rgba(255, 255, 255, .035);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  overflow-x: auto;
}
.arch__svg { min-width: 760px; width: 100%; height: auto; }
.arch__meta { margin-top: 34px; }
.stat {
  padding: 24px 20px;
  text-align: center;
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
}
.stat strong {
  display: block;
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, #7FA8FF, #B49BFF);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat span { font-size: 13.5px; color: var(--dark-text-muted); }

/* ---------- 10. 场景 ---------- */
.scene {
  position: relative;
  padding: 34px 26px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform .28s ease, box-shadow .28s ease;
}
.scene::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .32s ease;
}
.scene:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.scene:hover::before { transform: scaleX(1); }
.scene__num {
  display: block;
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 14px;
  color: rgba(46, 107, 245, .18);
}
.scene h3 { font-size: 17px; margin-bottom: 10px; }
.scene p { font-size: 14px; color: var(--text-muted); }

/* ---------- 11. 关于 ---------- */
.about {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: start;
}
.about__copy h2 { font-size: clamp(26px, 3.2vw, 38px); margin-bottom: 20px; }
.about__copy p { color: var(--text-muted); margin-bottom: 18px; }
.about__copy .btn { margin-top: 10px; }

.about__facts {
  padding: 32px 30px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.about__facts h3 {
  font-size: 17px;
  padding-bottom: 16px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.about__facts dl > div {
  display: grid;
  grid-template-columns: 118px 1fr;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--border);
}
.about__facts dt { font-size: 13.5px; color: var(--text-muted); }
.about__facts dd { font-size: 14px; font-weight: 500; }
.about__scope {
  margin-top: 18px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--text-muted);
}
.about__scope strong { color: var(--text); }

/* ---------- 12. 联系与表单 ---------- */
.contact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.contact__info h2 { font-size: clamp(26px, 3.2vw, 38px); color: #fff; margin-bottom: 16px; }
.contact__lead { color: var(--dark-text-muted); margin-bottom: 34px; }
.contact__list { display: grid; gap: 20px; }
.contact__list li { display: flex; gap: 16px; align-items: flex-start; }
.contact__ico {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px; height: 42px;
  border-radius: 12px;
  background: rgba(255, 255, 255, .08);
  border: 1px solid var(--dark-border);
  color: #8FB0FF;
}
.contact__ico svg { width: 19px; height: 19px; }
.contact__list dfn {
  display: block;
  font-style: normal;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--dark-text-muted);
  margin-bottom: 2px;
}
.contact__list a, .contact__list span { font-size: 15px; color: #fff; }
.contact__list a { border-bottom: 1px solid rgba(255, 255, 255, .3); transition: border-color .2s ease; }
.contact__list a:hover { border-color: #8FB0FF; }

/* 小程序二维码 */
.qr {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-top: 34px;
  padding-top: 30px;
  border-top: 1px solid var(--dark-border);
}
/* 二维码图本身带透明通道，必须垫白底，否则深色区上黑色码点不可见、无法扫描 */
.qr__card {
  flex: 0 0 auto;
  width: 132px;
  padding: 10px;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, .3);
  line-height: 0;
}
.qr__card img { width: 100%; height: auto; border-radius: 6px; }
.qr__text dfn {
  display: block;
  font-style: normal;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--dark-text-muted);
  margin-bottom: 4px;
}
.qr__text strong { display: block; font-size: 16px; color: #fff; margin-bottom: 8px; }
.qr__text p { font-size: 13.5px; color: var(--dark-text-muted); }

.form {
  padding: 34px 32px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
}
.form h3 { font-size: 19px; color: #fff; margin-bottom: 22px; }
.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 13.5px;
  color: var(--dark-text-muted);
  margin-bottom: 7px;
}
.field label i { font-style: normal; color: var(--accent); }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 14.5px;
  color: #fff;
  background: rgba(255, 255, 255, .06);
  border: 1px solid var(--dark-border);
  border-radius: 10px;
  transition: border-color .2s ease, background .2s ease, box-shadow .2s ease;
}
.field textarea { resize: vertical; min-height: 100px; }
.field select option { background: var(--dark-1); color: #fff; }
.field input::placeholder, .field textarea::placeholder { color: rgba(169, 184, 223, .55); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: #6E9BFF;
  background: rgba(255, 255, 255, .1);
  box-shadow: 0 0 0 3px rgba(46, 107, 245, .2);
}
.field.is-invalid input,
.field.is-invalid textarea { border-color: #FF6B6B; }
.field__err {
  margin-top: 6px;
  font-size: 12.5px;
  color: #FF9A9A;
  min-height: 0;
}
.form__note {
  margin-top: 14px;
  font-size: 13.5px;
  text-align: center;
  color: var(--dark-text-muted);
  min-height: 20px;
}
.form__note.is-ok { color: #6EE7B7; }

/* ---------- 13. 页脚 ---------- */
.footer {
  padding: 56px 0 34px;
  background: #070C1D;
  color: var(--dark-text-muted);
  border-top: 1px solid var(--dark-border);
}
.footer__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px 48px;
  align-items: start;
}
.footer__brand .brand__text { flex-direction: row; align-items: baseline; gap: 8px; }
.footer__brand .brand__text strong { color: #fff; font-size: 18px; }
.footer__brand .brand__text em { color: var(--dark-text-muted); }
.footer__brand p { margin-top: 8px; font-size: 13.5px; }
.footer__nav { display: flex; flex-wrap: wrap; gap: 8px 26px; }
.footer__nav a { font-size: 14px; transition: color .2s ease; }
.footer__nav a:hover { color: #fff; }
.footer__legal {
  grid-column: 1 / -1;
  padding-top: 24px;
  border-top: 1px solid var(--dark-border);
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  align-items: center;
}
.footer__legal a { border-bottom: 1px solid transparent; }
.footer__legal a:hover { color: #fff; border-color: currentColor; }
/* 备案号占位：上线前必须替换，样式刻意醒目防止误发布 */
.todo { display: inline-flex; align-items: center; gap: 8px; }
.todo__tag {
  padding: 1px 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .05em;
  color: #1A1200;
  background: #FFC44D;
  border-radius: 4px;
}

/* 回到顶部 */
.to-top {
  position: fixed;
  right: 26px; bottom: 26px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px; height: 46px;
  border-radius: 50%;
  color: #fff;
  background: var(--grad-brand);
  box-shadow: 0 8px 22px rgba(46, 107, 245, .38);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .28s ease, transform .28s ease, visibility .28s;
}
.to-top.is-show { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top svg { width: 20px; height: 20px; }

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1100px) {
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .product { grid-template-columns: 1fr; }
  .product__visual { position: static; max-width: 420px; margin: 0 auto; }
  .hero__inner { gap: 30px; }
  .hero__svg { max-width: 500px; }
}

@media (max-width: 900px) {
  :root { --nav-h: 64px; }
  .section { padding: 74px 0; }

  .nav__toggle { display: flex; }
  .nav__menu {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 24px 26px;
    background: rgba(11, 18, 41, .97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--dark-border);
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .26s ease, transform .26s ease, visibility .26s;
  }
  .nav__menu.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
  .nav__menu > a:not(.btn) {
    padding: 14px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, .08);
    color: rgba(255, 255, 255, .86);
  }
  .nav__menu > a:not(.btn)::after { display: none; }
  .nav.is-stuck .nav__menu > a:not(.btn) { color: rgba(255, 255, 255, .86); }
  .nav__menu .btn { margin-top: 18px; }

  /* 抽屉里不做二级折叠：按钮退化成分组标题，两条方案直接平铺 */
  .nav__group { position: static; }
  .nav__group-btn {
    display: block;
    width: 100%;
    text-align: left;
    pointer-events: none;
    padding: 16px 4px 6px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .16em;
    color: rgba(255, 255, 255, .42);
  }
  .nav.is-stuck .nav__group-btn { color: rgba(255, 255, 255, .42); }
  .nav__group-btn::after,
  .nav__group-caret { display: none; }

  .nav__group-panel,
  .nav__group-btn[aria-expanded="true"] + .nav__group-panel {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    min-width: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    backdrop-filter: none;
    box-shadow: none;
  }
  .nav__group-panel::before { display: none; }
  .nav__group-panel a {
    padding: 12px 4px;
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, .08);
  }
  .nav__group-panel a:hover { background: none; }
  .nav__group-panel strong { color: rgba(255, 255, 255, .86); font-weight: 500; font-size: 15px; }

  .hero {
    min-height: auto;
    padding: calc(var(--nav-h) + 46px) 0 76px;
  }
  .hero__inner { grid-template-columns: 1fr; gap: 34px; text-align: center; }
  .hero__lead { margin-left: auto; margin-right: auto; }
  .hero__actions { justify-content: center; }
  .hero__stats { justify-content: center; gap: 28px; }
  .eyebrow--line { justify-content: center; }
  .hero__art { order: -1; }
  .hero__svg { max-width: 400px; }
  .hero__scroll { display: none; }
  .hero__glow { width: 480px; height: 480px; }

  .about, .contact { grid-template-columns: 1fr; gap: 36px; }
  .footer__inner { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  :root { --gutter: 18px; }
  .section { padding: 60px 0; }
  .sec-head { margin-bottom: 40px; }
  .grid--3, .grid--4, .product__list { grid-template-columns: 1fr; }
  .card, .scene, .about__facts, .form { padding: 26px 22px; }
  .qr { flex-direction: column; align-items: flex-start; gap: 16px; }
  .qr__card { width: 150px; }
  .hero__stats { gap: 20px 26px; }
  .hero__stats dt { font-size: 21px; }
  .hero__svg { max-width: 300px; }
  .hero__grid { background-size: 44px 44px; }
  .about__facts dl > div { grid-template-columns: 1fr; gap: 2px; }
  .to-top { right: 16px; bottom: 16px; }
}

/* ---------- 15. 无障碍与深色模式 ---------- */
/* 滚动入场动画 */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s cubic-bezier(.22, .8, .3, 1), transform .7s cubic-bezier(.22, .8, .3, 1);
}
.reveal.is-in { opacity: 1; transform: none; }

/* 键盘焦点可见 */
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible {
  outline: 2px solid #6E9BFF;
  outline-offset: 3px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* 系统深色模式：仅反转浅色区，深色区本身保持不变 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0D1220;
    --bg-tint: #111829;
    --surface: #151D31;
    --text: #E9EEF9;
    --text-muted: #9AA7C2;
    --border: #253048;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, .38);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, .45);
  }
  .nav.is-stuck {
    background: rgba(13, 18, 32, .9);
    box-shadow: 0 1px 0 var(--border);
  }
  .eyebrow--dark { color: #7FA8FF; }
  .scene__num { color: rgba(127, 168, 255, .22); }
  .card__icon--blue   { background: rgba(46, 107, 245, .2); color: #7FA8FF; }
  .card__icon--purple { background: rgba(122, 92, 240, .2); color: #B49BFF; }
  .card__icon--teal   { background: rgba(20, 184, 166, .2); color: #5EEAD4; }
  .card__icon--orange { background: rgba(255, 138, 76, .2); color: #FFB088; }
  .product__visual { box-shadow: var(--shadow-md); }
}

/* 打印 */
@media print {
  .nav, .to-top, .form, .hero__art { display: none !important; }
  .hero, .section--dark, .footer { background: #fff !important; color: #000 !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
}