/* ============================================================
   重庆蓝筹能源有限公司 · 官网样式表
   设计基调：深色工业科技风（深空蓝底 + 青绿能源主色 + 琥珀火焰辅色）
   纯手写实现，零外部依赖（不引 CDN / 不引外链字体），保证国内访问速度与可用性
   结构：1 设计令牌 2 重置 3 布局 4 页头导航 5 首屏 6 通用组件
        7 各内容区块 8 表单 9 页脚 10 动效 11 响应式 12 无障碍/打印
   ============================================================ */

/* ============================================================
   1. 设计令牌
   ============================================================ */
:root {
  /* 背景层次：由深到浅，营造纵深 */
  --bg: #080d15;
  --bg-2: #0c141f;
  --panel: #121c29;
  --panel-2: #182636;
  --panel-3: #1f3044;

  /* 描边 */
  --line: rgba(140, 180, 220, 0.2);
  --line-strong: rgba(140, 180, 220, 0.38);

  /* 文字：确保对比度 ≥ 4.5:1 */
  --text: #eef4fb;
  --text-2: #c3d2e2;
  --muted: #9aadc2;

  /* 品牌色 */
  --brand: #00d3b4;
  --brand-2: #12b7f5;
  --brand-3: #3f6ef5;
  --flame: #ff9130;
  --ok: #3ddc97;

  /* 渐变 */
  --grad-brand: linear-gradient(120deg, #00d3b4 0%, #12b7f5 55%, #3f6ef5 100%);
  --grad-flame: linear-gradient(120deg, #ff9130 0%, #ff5f6d 100%);

  /* 圆角 */
  --r-s: 8px;
  --r: 14px;
  --r-l: 22px;

  /* 阴影与光晕 */
  --shadow: 0 18px 50px -18px rgba(0, 0, 0, 0.75);
  --glow: 0 0 0 1px rgba(0, 211, 180, 0.28), 0 12px 40px -12px rgba(0, 211, 180, 0.32);

  /* 尺寸 */
  --maxw: 1200px;
  --header-h: 72px;

  /* 字体：系统字体栈，避免外链字体在国内被墙 */
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

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

/* 全站背景氛围：网格 + 双色光晕，纯 CSS 无图片请求 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 520px at 78% -8%, rgba(0, 211, 180, 0.2), transparent 62%),
    radial-gradient(760px 480px at 6% 4%, rgba(63, 110, 245, 0.18), transparent 60%),
    linear-gradient(180deg, #080d15 0%, #0b121c 45%, #080d15 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(140, 180, 220, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 180, 220, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 78%);
}

img,
svg,
video { display: block; max-width: 100%; height: auto; }

h1, h2, h3, h4 {
  margin: 0 0 0.6em;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; }

a {
  color: var(--brand);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover { color: #4ee7cd; }

ul { margin: 0; padding: 0; list-style: none; }

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

/* 统一焦点环：键盘可达性 */
:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: rgba(0, 211, 180, 0.3);
  color: #fff;
}

/* ============================================================
   3. 布局工具
   ============================================================ */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  position: relative;
  padding: 92px 0;
}

.section--tight { padding: 60px 0; }

.section__head {
  max-width: 720px;
  margin-bottom: 52px;
}

.section__head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 5px 14px 5px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(0, 211, 180, 0.07);
  color: var(--brand);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(0, 211, 180, 0.18);
}

.section__title {
  font-size: clamp(26px, 3.4vw, 42px);
  margin-bottom: 16px;
}

.section__title em {
  font-style: normal;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section__sub {
  color: var(--text-2);
  font-size: clamp(15px, 1.4vw, 17px);
  margin: 0;
}

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.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;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--r-s);
  background: var(--brand);
  color: #04121a;
  font-weight: 700;
  transition: top 0.2s ease;
}

.skip-link:focus { top: 12px; color: #04121a; }

/* ============================================================
   4. 页头与导航
   ============================================================ */
.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(6, 10, 17, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-size: 13px;
  color: var(--text-2);
}

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 40px;
}

.topbar__tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.topbar__tag::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px rgba(61, 220, 151, 0.18);
  flex: none;
}

.topbar__links { display: flex; align-items: center; gap: 22px; }
.topbar__links a { color: var(--text-2); }
.topbar__links a:hover { color: var(--brand); }
.topbar__tel { color: var(--brand) !important; font-weight: 700; font-variant-numeric: tabular-nums; }

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  background: rgba(6, 10, 17, 0.55);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.header.is-stuck {
  background: rgba(6, 10, 17, 0.93);
  border-bottom-color: var(--line);
  box-shadow: 0 10px 30px -18px rgba(0, 0, 0, 0.9);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: var(--header-h);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
  color: var(--text);
}

.logo:hover { color: var(--text); }

.logo__mark {
  width: 38px;
  height: 38px;
  flex: none;
  border-radius: 11px;
  background: var(--grad-brand);
  display: grid;
  place-items: center;
  box-shadow: 0 8px 22px -8px rgba(0, 211, 180, 0.75);
}

.logo__text { display: flex; flex-direction: column; line-height: 1.15; }
.logo__cn { font-size: 17px; font-weight: 700; letter-spacing: 0.01em; }
.logo__en {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }

.nav__link {
  position: relative;
  padding: 9px 15px;
  border-radius: 9px;
  color: var(--text-2);
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav__link:hover { color: var(--text); background: rgba(255, 255, 255, 0.05); }
.nav__link[aria-current="page"] { color: var(--brand); }
.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-brand);
}

.header__actions { display: flex; align-items: center; gap: 12px; flex: none; }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  place-items: center;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: background 0.2s ease;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.25s ease, top 0.25s ease;
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* ============================================================
   5. 按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.25s ease, background 0.2s ease,
    border-color 0.2s ease, color 0.2s ease;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--grad-brand);
  color: #04121a;
  box-shadow: 0 14px 34px -14px rgba(0, 211, 180, 0.8);
}

.btn--primary:hover { color: #04121a; box-shadow: 0 18px 40px -12px rgba(0, 211, 180, 0.95); }

.btn--ghost {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}

.btn--ghost:hover {
  border-color: var(--brand);
  color: var(--brand);
  background: rgba(0, 211, 180, 0.08);
}

.btn--flame {
  background: var(--grad-flame);
  color: #fff;
  box-shadow: 0 14px 34px -14px rgba(255, 91, 109, 0.7);
}

.btn--sm { padding: 9px 18px; font-size: 14px; }
.btn--block { width: 100%; }

/* ============================================================
   6. 卡片与通用组件
   ============================================================ */
.card {
  position: relative;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(26, 40, 58, 0.86) 0%, rgba(18, 28, 41, 0.86) 100%);
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}

/* 卡片顶部品牌色高光线 */
.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.card:hover::before { transform: scaleX(1); }

.card__icon {
  width: 52px;
  height: 52px;
  margin-bottom: 20px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: rgba(0, 211, 180, 0.1);
  border: 1px solid rgba(0, 211, 180, 0.24);
  color: var(--brand);
}

.card__icon--flame {
  background: rgba(255, 145, 48, 0.1);
  border-color: rgba(255, 145, 48, 0.26);
  color: var(--flame);
}

.card__icon--blue {
  background: rgba(18, 183, 245, 0.1);
  border-color: rgba(18, 183, 245, 0.26);
  color: var(--brand-2);
}

.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--text-2); font-size: 15px; margin-bottom: 0; }

.card__list { margin-top: 18px; display: flex; flex-direction: column; gap: 9px; }

.card__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--text-2);
}

.card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
  opacity: 0.85;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.035);
  color: var(--text-2);
  font-size: 12.5px;
  font-weight: 500;
  font-family: var(--mono);
  letter-spacing: 0.02em;
}

.tag--brand {
  border-color: rgba(0, 211, 180, 0.35);
  background: rgba(0, 211, 180, 0.1);
  color: var(--brand);
}

.tag--flame {
  border-color: rgba(255, 145, 48, 0.35);
  background: rgba(255, 145, 48, 0.1);
  color: var(--flame);
}

/* 数据条 */
.stat-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  padding: 30px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stat__num {
  display: block;
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.15;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

.stat__label { display: block; margin-top: 6px; font-size: 14px; color: var(--muted); }

/* ============================================================
   7. 首屏 Hero
   ============================================================ */
.hero {
  position: relative;
  padding: 88px 0 76px;
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 56px;
  align-items: center;
}

.hero__title {
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1.14;
  margin-bottom: 22px;
}

.hero__title span {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lead {
  max-width: 560px;
  color: var(--text-2);
  font-size: clamp(15px, 1.5vw, 18px);
  margin-bottom: 32px;
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 34px; }

.hero__points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 14px;
  color: var(--text-2);
}

.hero__points li { display: inline-flex; align-items: center; gap: 8px; }

.hero__points li::before {
  content: "";
  width: 16px;
  height: 16px;
  flex: none;
  border-radius: 50%;
  background: rgba(0, 211, 180, 0.14);
  box-shadow: inset 0 0 0 1px rgba(0, 211, 180, 0.5);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.4l2.3 2.3 4.7-5' fill='none' stroke='%2300d3b4' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-size: 100% 100%;
}

.hero__visual { position: relative; }

.hero__visual svg { width: 100%; height: auto; }

/* 浮动卡片：纯 SVG 配一张浮起的规格卡 */
.spec-card {
  position: absolute;
  right: 8px;
  bottom: -6px;
  padding: 16px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
  background: rgba(10, 17, 25, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.spec-card__k { font-size: 12px; color: var(--muted); letter-spacing: 0.08em; text-transform: uppercase; }
.spec-card__v { font-size: 22px; font-weight: 700; color: var(--brand); font-variant-numeric: tabular-nums; }
.spec-card__d { font-size: 12.5px; color: var(--text-2); margin-top: 2px; }

/* ============================================================
   8. 产品区块
   ============================================================ */
.prod-group + .prod-group { margin-top: 72px; }

.prod-group__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.prod-group__title { font-size: clamp(22px, 2.4vw, 30px); margin: 0; }
.prod-group__desc { color: var(--muted); font-size: 14.5px; margin: 6px 0 0; max-width: 640px; }

.prod-card__code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--brand);
  text-transform: uppercase;
}

.prod-card__foot {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line-strong);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* 规格表：桌面表格 / 移动端卡片 */
.spec-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  font-size: 14.5px;
}

.spec-table th,
.spec-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}

.spec-table thead th {
  background: rgba(26, 40, 57, 0.9);
  color: var(--text);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.spec-table tbody tr:nth-child(even) { background: rgba(255, 255, 255, 0.018); }
.spec-table tbody tr:last-child td { border-bottom: 0; }
.spec-table tbody tr:hover { background: rgba(0, 211, 180, 0.055); }

.spec-table code {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--brand);
  background: rgba(0, 211, 180, 0.09);
  border: 1px solid rgba(0, 211, 180, 0.22);
  border-radius: 6px;
  padding: 2px 8px;
  white-space: nowrap;
}

.spec-table .num { font-variant-numeric: tabular-nums; white-space: nowrap; }

.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* 纯度等级条 */
.purity-scale {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.purity-scale__item {
  flex: 1;
  padding: 18px 16px;
  text-align: center;
  background: rgba(255, 255, 255, 0.02);
}

.purity-scale__item + .purity-scale__item { border-left: 1px solid var(--line); }
.purity-scale__k { font-size: 13px; font-weight: 700; color: var(--brand); font-family: var(--mono); }
.purity-scale__v { font-size: 12.5px; color: var(--muted); margin-top: 3px; }
.purity-scale__item--peak { background: rgba(0, 211, 180, 0.1); }

/* ============================================================
   9. 物流网络 / 能力
   ============================================================ */
.network {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: center;
}

.network__map {
  position: relative;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background: radial-gradient(circle at 50% 42%, rgba(0, 211, 180, 0.09), transparent 62%),
    rgba(15, 23, 34, 0.6);
}

.network__map svg { width: 100%; height: auto; }

.feature {
  display: flex;
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.feature:last-child { border-bottom: 0; }

.feature__num {
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: rgba(0, 211, 180, 0.1);
  border: 1px solid rgba(0, 211, 180, 0.24);
  color: var(--brand);
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
}

.feature h3 { font-size: 17px; margin-bottom: 5px; }
.feature p { margin: 0; color: var(--text-2); font-size: 14.5px; }

/* 行业应用 */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.industry {
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(24, 38, 56, 0.62);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.industry:hover { transform: translateY(-4px); border-color: rgba(0, 211, 180, 0.4); }
.industry__name { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.industry__desc { font-size: 13.5px; color: var(--muted); margin: 0; }

/* 研发 */
.rd {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 52px;
  align-items: center;
}

.rd__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.rd__badge {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 17px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.035);
  font-size: 13.5px;
  color: var(--text-2);
}

.rd__badge strong { color: var(--text); font-weight: 600; }

/* 时间线 */
.timeline { position: relative; padding-left: 30px; }

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand), rgba(63, 110, 245, 0.35), transparent);
}

.timeline__item { position: relative; padding-bottom: 30px; }

.timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--brand);
  box-shadow: 0 0 0 4px rgba(0, 211, 180, 0.14);
}

.timeline__item:last-child { padding-bottom: 0; }
.timeline__t { font-family: var(--mono); font-size: 13px; color: var(--brand); letter-spacing: 0.06em; }
.timeline__h { font-size: 16.5px; font-weight: 700; margin: 4px 0 6px; }
.timeline__p { margin: 0; color: var(--text-2); font-size: 14.5px; }

/* CTA 横幅 */
.cta-band {
  position: relative;
  overflow: hidden;
  padding: 56px 44px;
  border: 1px solid rgba(0, 211, 180, 0.26);
  border-radius: var(--r-l);
  background:
    radial-gradient(700px 320px at 12% 0%, rgba(0, 211, 180, 0.16), transparent 60%),
    radial-gradient(600px 320px at 88% 100%, rgba(63, 110, 245, 0.16), transparent 60%),
    rgba(15, 23, 34, 0.72);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  flex-wrap: wrap;
}

.cta-band h2 { font-size: clamp(23px, 2.6vw, 32px); margin-bottom: 8px; }
.cta-band p { margin: 0; color: var(--text-2); }
.cta-band__actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ============================================================
   10. 表单
   ============================================================ */
.form { display: grid; gap: 18px; }

.form__row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }

.field { display: flex; flex-direction: column; gap: 8px; }

.field__label { font-size: 13.5px; color: var(--text-2); font-weight: 500; }

.field__label .req { color: var(--flame); margin-left: 3px; }

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-s);
  background: rgba(6, 10, 17, 0.6);
  color: var(--text);
  font-size: 15px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.field textarea { min-height: 128px; resize: vertical; line-height: 1.7; }

.field input::placeholder,
.field textarea::placeholder { color: #64778e; }

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--brand);
  background: rgba(6, 10, 17, 0.85);
  box-shadow: 0 0 0 3px rgba(0, 211, 180, 0.14);
}

.field select { appearance: none; cursor: pointer; padding-right: 40px; }

.field__select-wrap { position: relative; }

.field__select-wrap::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -6px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  pointer-events: none;
}

.form__note { font-size: 13px; color: var(--muted); margin: 0; }

.form__status {
  display: none;
  padding: 13px 16px;
  border-radius: var(--r-s);
  font-size: 14px;
  border: 1px solid rgba(61, 220, 151, 0.34);
  background: rgba(61, 220, 151, 0.1);
  color: var(--ok);
}

.form__status.is-visible { display: block; }
.form__status.is-error {
  border-color: rgba(255, 91, 109, 0.36);
  background: rgba(255, 91, 109, 0.1);
  color: #ff8f99;
}

/* 联系方式块 */
.contact-item {
  display: flex;
  gap: 16px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(20, 32, 48, 0.55);
}

.contact-item__icon {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(0, 211, 180, 0.1);
  border: 1px solid rgba(0, 211, 180, 0.24);
  color: var(--brand);
}

.contact-item__k { font-size: 13px; color: var(--muted); margin-bottom: 3px; }
.contact-item__v { font-size: 17px; font-weight: 700; word-break: break-all; }
.contact-item__v a { color: var(--text); }
.contact-item__v a:hover { color: var(--brand); }

/* FAQ */
.faq { border-top: 1px solid var(--line); }

.faq__item { border-bottom: 1px solid var(--line); }

.faq__q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 21px 0;
  border: 0;
  background: none;
  text-align: left;
  font-size: 16.5px;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
}

.faq__q:hover { color: var(--brand); }

.faq__icon {
  flex: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  transition: transform 0.3s ease, background 0.3s ease, border-color 0.3s ease;
}

.faq__q[aria-expanded="true"] .faq__icon {
  transform: rotate(45deg);
  background: rgba(0, 211, 180, 0.14);
  border-color: var(--brand);
}

.faq__a {
  overflow: hidden;
  height: 0;
  transition: height 0.32s ease;
}

.faq__a-inner { padding: 0 0 22px; color: var(--text-2); font-size: 14.5px; max-width: 820px; }

/* ============================================================
   11. 页脚
   ============================================================ */
.footer {
  border-top: 1px solid var(--line);
  background: rgba(4, 8, 13, 0.75);
  padding: 64px 0 26px;
  margin-top: 40px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 44px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.footer__col h4 {
  font-size: 14.5px;
  margin-bottom: 16px;
  color: var(--text);
}

.footer__links { display: flex; flex-direction: column; gap: 11px; }

.footer__links a {
  color: var(--muted);
  font-size: 14px;
}

.footer__links a:hover { color: var(--brand); }

.footer__about p { color: var(--muted); font-size: 14px; margin: 16px 0 0; max-width: 340px; }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding-top: 24px;
  font-size: 13px;
  color: var(--muted);
}

/* 工信部 ICP 备案号：按《非经营性互联网信息服务备案管理办法》要求悬挂 */
.footer__icp {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.footer__icp a {
  color: var(--muted);
  transition: color 0.2s ease;
}

.footer__icp a:hover { color: var(--brand); }

.footer__icp img { display: inline-block; }

.footer__sep { color: #3b4a5c; }

/* 公安备案 */
.footer__police { display: inline-flex; align-items: center; gap: 6px; }
.footer__police img { display: inline-block; }

/* 公安联网备案待办理提示：未取得备案号前不展示虚假编号，
   办理完成后由 set-icp.sh 回填真实编号并移除本样式 */
.footer__police-pending {
  color: #7d8ea3;
  font-size: 12.5px;
  cursor: help;
  border-bottom: 1px dotted #55647a;
}

/* ============================================================
   12. 动效
   ============================================================ */
/* 渐进增强关键：
   .reveal 默认「可见」，只有当 JS 接管后才加 .js-ready 类隐藏初始态。
   这样即使 JS 未加载、加载失败或被浏览器拦截，内容依然完整可读，
   不会出现整块区域空白（首屏以下的卡片/表格全部 opacity:0 的事故）。
   -webkit- 前缀用于 Safari 15 及以下不支持 :has() 的兼容。 */
.js-ready .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.js-ready .reveal.is-in { opacity: 1; transform: none; }

/* 无 JS 环境下的降级：强制显示，禁用位移动画 */
.no-js .reveal,
.no-js .reveal.reveal-delay-1,
.no-js .reveal.reveal-delay-2,
.no-js .reveal.reveal-delay-3,
.no-js .reveal.reveal-delay-4 {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

/* SVG 流动线条 */
.flow-line {
  stroke-dasharray: 6 10;
  animation: flow 2.4s linear infinite;
}

@keyframes flow {
  to { stroke-dashoffset: -32; }
}

.pulse-ring {
  transform-origin: center;
  animation: pulse 2.8s ease-out infinite;
}

@keyframes pulse {
  0% { transform: scale(0.6); opacity: 0.85; }
  100% { transform: scale(1.9); opacity: 0; }
}

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(15, 23, 34, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease,
    border-color 0.2s ease, color 0.2s ease;
}

.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--brand); color: var(--brand); }

/* ============================================================
   13. 响应式
   ============================================================ */
@media (max-width: 1080px) {
  .hero__grid { gap: 40px; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 36px; }
}

@media (max-width: 920px) {
  .section { padding: 68px 0; }

  .nav-toggle { display: grid; }

  .nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 84vw);
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    margin: 0;
    padding: 92px 22px 30px;
    background: rgba(8, 13, 20, 0.98);
    border-left: 1px solid var(--line);
    box-shadow: -24px 0 60px -20px rgba(0, 0, 0, 0.9);
    transform: translateX(100%);
    transition: transform 0.32s cubic-bezier(0.22, 1, 0.36, 1);
    overflow-y: auto;
  }

  .nav.is-open { transform: none; }

  .nav__link { padding: 13px 16px; font-size: 16px; }
  .nav__link[aria-current="page"]::after { left: 16px; right: auto; width: 22px; bottom: 8px; }

  .nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(3, 6, 10, 0.66);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
  }

  .nav-backdrop.is-visible { opacity: 1; visibility: visible; }

  .header__actions .btn { display: none; }

  .hero__grid,
  .network,
  .rd { grid-template-columns: minmax(0, 1fr); gap: 40px; }

  .hero { padding: 60px 0 56px; }
  .hero__visual { max-width: 520px; margin: 0 auto; }
  .spec-card { right: 0; bottom: -12px; }

  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .stat-row { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }

  .cta-band { padding: 42px 28px; }

  /* 表格转卡片 */
  .spec-table thead { display: none; }
  .spec-table,
  .spec-table tbody,
  .spec-table tr,
  .spec-table td { display: block; width: 100%; }
  .spec-table tr {
    border-bottom: 1px solid var(--line);
    padding: 8px 0;
  }
  .spec-table tr:last-child { border-bottom: 0; }
  .spec-table td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    padding: 9px 16px;
    border-bottom: 0;
    text-align: right;
  }
  .spec-table td::before {
    content: attr(data-label);
    flex: none;
    font-size: 12.5px;
    color: var(--muted);
    font-weight: 500;
    text-align: left;
  }
  .spec-table tbody tr:nth-child(even) { background: transparent; }
  .spec-table tbody tr:hover { background: rgba(0, 211, 180, 0.05); }
}

@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .section { padding: 54px 0; }
  .section__head { margin-bottom: 34px; }

  .topbar__inner { min-height: 36px; font-size: 12px; }
  .topbar__links { gap: 14px; }
  .topbar__links .topbar__hide-sm { display: none; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .card { padding: 24px 20px; }

  .stat-row { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 16px; padding: 24px 0; }

  .purity-scale { flex-direction: column; }
  .purity-scale__item + .purity-scale__item { border-left: 0; border-top: 1px solid var(--line); }

  .form__row { grid-template-columns: minmax(0, 1fr); }

  .hero__actions .btn { flex: 1 1 100%; }

  .footer__grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }

  .cta-band { padding: 34px 22px; }
  .cta-band__actions { width: 100%; }
  .cta-band__actions .btn { flex: 1 1 100%; }

  .to-top { right: 14px; bottom: 14px; width: 42px; height: 42px; }
}

/* 触摸设备去掉 hover 位移，避免点击后错位 */
@media (hover: none) {
  .btn:hover,
  .card:hover,
  .industry:hover { transform: none; }
}

/* ============================================================
   14. 无障碍与打印
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .js-ready .reveal { opacity: 1; transform: none; }
}

@media print {
  body::before,
  body::after { display: none; }

  body { background: #fff; color: #111; }

  .header,
  .topbar,
  .to-top,
  .nav-backdrop { display: none !important; }

  .card,
  .spec-table { border-color: #ccc; background: #fff; }
}