/* ==========================================================================
   镇江凯通电气 — 官网静态模板
   设计系统：工业科技风（暗色 + 电青/热橙双强调色）
   文件：assets/css/main.css
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ink-900: #05070b;
  --ink-850: #080c13;
  --ink-800: #0b111a;
  --ink-700: #0f1621;
  --ink-600: #141d2a;
  --ink-500: #1b2634;

  --line: rgba(148, 178, 209, 0.14);
  --line-2: rgba(148, 178, 209, 0.28);

  --text: #e9eff7;
  --text-2: #a7b7c9;
  --text-3: #6f8398;

  --cyan: #2fd4f0;
  --cyan-2: #38bdf8;
  --amber: #ffa23a;
  --amber-2: #ff6a2b;
  --danger: #ff6b6b;
  --ok: #3ddc97;

  --grad-heat: linear-gradient(115deg, #ff6a2b 0%, #ffb648 100%);
  --grad-tech: linear-gradient(115deg, #38bdf8 0%, #2fd4f0 100%);
  --grad-line: linear-gradient(90deg, transparent, var(--line-2) 20%, var(--line-2) 80%, transparent);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;

  --container: 1240px;
  --gutter: 24px;

  --shadow-sm: 0 10px 24px -14px rgba(0, 0, 0, 0.9);
  --shadow: 0 26px 60px -24px rgba(0, 0, 0, 0.95);
  --glow-cyan: 0 0 0 1px rgba(47, 212, 240, 0.35), 0 18px 50px -22px rgba(47, 212, 240, 0.55);
  --glow-amber: 0 0 0 1px rgba(255, 162, 58, 0.35), 0 18px 50px -22px rgba(255, 106, 43, 0.55);

  /* 字体策略：只用「开源免费」或「随操作系统附带」的字体，
     站点不打包、不下载任何字体文件（0 个 woff/ttf、0 个外链字体）。
     Inter / JetBrains Mono = SIL OFL 1.1 可免费商用；
     HarmonyOS Sans SC = 华为免费商用授权；
     PingFang SC / 微软雅黑 / Segoe UI = 随 macOS / Windows 系统附带，本站不分发；
     已移除 Hiragino Sans GB（冬青黑体，Fontworks 商业付费字体） */
  --font-sans: "Inter", "HarmonyOS Sans SC", "PingFang SC",
    "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  /* 主题相关：所有写死的深色都走这些变量，浅色主题只覆盖这里 */
  --grid-line: rgba(148, 178, 209, 0.06);
  --grid-line-2: rgba(148, 178, 209, 0.055);
  --grid-line-3: rgba(148, 178, 209, 0.07);
  --frame-a: rgba(20, 29, 42, 0.9);
  --frame-b: rgba(8, 12, 19, 0.9);
  --panel: rgba(8, 12, 19, 0.92);
  --panel-soft: rgba(8, 12, 19, 0.6);
  --panel-soft-2: rgba(8, 12, 19, 0.8);
  --panel-soft-3: rgba(8, 12, 19, 0.9);
  --surface-badge: rgba(20, 29, 42, 0.6);
  --card-a: rgba(20, 29, 42, 0.75);
  --card-b: rgba(9, 13, 20, 0.75);
  --input-bg: rgba(8, 12, 19, 0.7);
  --soft-block: rgba(20, 29, 42, 0.5);
  --soft-block-2: rgba(20, 29, 42, 0.45);
  --hover-soft: rgba(148, 178, 209, 0.08);
  --scrim: rgba(3, 5, 8, 0.66);
  --header-bg: rgba(5, 7, 11, 0.72);
  --header-bg-2: rgba(5, 7, 11, 0.9);
  --soft-cyan: rgba(47, 212, 240, 0.08);
  --soft-cyan-2: rgba(47, 212, 240, 0.1);
  --soft-cyan-3: rgba(47, 212, 240, 0.06);
  --soft-heat: rgba(255, 162, 58, 0.1);
  --soft-heat-2: rgba(255, 106, 43, 0.16);
  --soft-heat-3: rgba(255, 106, 43, 0.12);
  --soft-heat-4: rgba(255, 106, 43, 0.14);
  --border-heat: rgba(255, 162, 58, 0.4);
  --border-heat-2: rgba(255, 162, 58, 0.3);
  --wash-orange: rgba(255, 106, 43, 0.16);
  --wash-orange-2: rgba(255, 106, 43, 0.12);
  --wash-cyan: rgba(47, 212, 240, 0.18);
  --wash-cyan-2: rgba(47, 212, 240, 0.14);
}

/* ---------- 1b. 浅色主题（右上角图标切换，选择会被记住） ---------- */
:root[data-theme="light"] {
  --ink-900: #f4f7fb;
  --ink-850: #eaeff6;
  --ink-800: #ffffff;
  --ink-700: #ffffff;
  --ink-600: #eef3f9;
  --ink-500: #dbe4ee;

  --line: rgba(16, 35, 58, 0.12);
  --line-2: rgba(16, 35, 58, 0.24);

  --text: #0e1c2c;
  --text-2: #43596f;
  /* 浅色主题下原值 #6d8098 对白/浅灰底仅 3.5:1，加深到 ≥4.7:1（WCAG AA） */
  --text-3: #5c6b80;

  --cyan: #0a8fb0;
  --cyan-2: #12a6c6;
  --amber: #bf5d0b;
  --amber-2: #e2601b;

  --grad-heat: linear-gradient(115deg, #ea5514 0%, #ef9208 100%);
  --grad-tech: linear-gradient(115deg, #0d8fb5 0%, #17b0cc 100%);

  --shadow-sm: 0 8px 20px -14px rgba(16, 35, 58, 0.35);
  --shadow: 0 20px 44px -26px rgba(16, 35, 58, 0.45);
  --glow-cyan: 0 0 0 1px rgba(18, 166, 198, 0.35), 0 16px 36px -22px rgba(18, 166, 198, 0.45);
  --glow-amber: 0 0 0 1px rgba(226, 96, 27, 0.35), 0 16px 36px -22px rgba(226, 96, 27, 0.42);

  --grid-line: rgba(16, 35, 58, 0.07);
  --grid-line-2: rgba(16, 35, 58, 0.06);
  --grid-line-3: rgba(16, 35, 58, 0.08);
  --frame-a: #ffffff;
  --frame-b: #f6f9fc;
  --panel: #ffffff;
  --panel-soft: #ffffff;
  --panel-soft-2: #ffffff;
  --panel-soft-3: #ffffff;
  --surface-badge: #eef3f9;
  --card-a: #ffffff;
  --card-b: #f8fbfe;
  --input-bg: #ffffff;
  --soft-block: #f1f5fa;
  --soft-block-2: #f1f5fa;
  --hover-soft: rgba(16, 35, 58, 0.06);
  --scrim: rgba(16, 35, 58, 0.38);
  --header-bg: rgba(255, 255, 255, 0.82);
  --header-bg-2: rgba(255, 255, 255, 0.94);
  --soft-cyan: rgba(18, 166, 198, 0.1);
  --soft-cyan-2: rgba(18, 166, 198, 0.12);
  --soft-cyan-3: rgba(18, 166, 198, 0.07);
  --soft-heat: rgba(226, 96, 27, 0.1);
  --soft-heat-2: rgba(226, 96, 27, 0.12);
  --soft-heat-3: rgba(226, 96, 27, 0.09);
  --soft-heat-4: rgba(226, 96, 27, 0.12);
  --border-heat: rgba(226, 96, 27, 0.35);
  --border-heat-2: rgba(226, 96, 27, 0.3);
  --wash-orange: rgba(226, 96, 27, 0.1);
  --wash-orange-2: rgba(226, 96, 27, 0.09);
  --wash-cyan: rgba(18, 166, 198, 0.13);
  --wash-cyan-2: rgba(18, 166, 198, 0.1);
  --grad-line: linear-gradient(90deg, transparent, var(--line-2) 20%, var(--line-2) 80%, transparent);
}

/* 白底上线稿插图对比度不足，浅色模式下略微压暗 */
:root[data-theme="light"] .hero-visual svg,
:root[data-theme="light"] .product-card__media svg,
:root[data-theme="light"] .detail-media svg {
  filter: brightness(0.72) saturate(1.06);
}

:root[data-theme="light"] .spec-table th { color: var(--text-2); }

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

* { margin: 0; padding: 0; }

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--ink-900);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; text-decoration: none; }

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

ul,
ol { list-style: none; }

/* hidden 属性必须真正生效：.card / .post-item 等自带 display，
   会盖过浏览器内置的 [hidden] { display: none }，导致筛选失效 */
[hidden] { display: none !important; }

h1, h2, h3, h4 {
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 4.4vw, 3.5rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.5rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }

p { color: var(--text-2); }

::selection { background: rgba(47, 212, 240, 0.28); color: #fff; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--cyan);
  color: #04121a;
  font-weight: 700;
  border-radius: 0 0 10px 10px;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 0; }

/* 仅供读屏与搜索引擎的区块标题（补全标题层级，不改变版式） */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 3. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding: clamp(64px, 8vw, 116px) 0;
  position: relative;
}

.section--tight { padding: clamp(48px, 5vw, 76px) 0; }

.section--alt { background: var(--ink-850); }

.section--hairline { border-top: 1px solid var(--line); }

.grid { display: grid; gap: 22px; }
.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)); }

.sec-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 46px;
}

.sec-head__main { max-width: 720px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.8;
}
.eyebrow--heat { color: var(--amber); }
.eyebrow--heat::before { background: var(--amber); }

.sec-desc { margin-top: 16px; font-size: 1.05rem; color: var(--text-2); }

.lead { font-size: 1.08rem; line-height: 1.85; }

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }

.divider {
  height: 1px;
  background: var(--grad-line);
  border: 0;
  margin: 0;
}

/* 蓝图网格背景 */
.grid-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 20%, transparent 78%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 20%, transparent 78%);
}

/* ---------- 4. 按钮 ---------- */
.btn {
  --btn-bg: var(--grad-heat);
  --btn-fg: #1a0a02;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  border: 0;
  border-radius: 999px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), opacity 0.2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--glow-amber); }
.btn:active { transform: translateY(0); }

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--text);
  border: 1px solid var(--line-2);
}
.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.btn--tech { --btn-bg: var(--grad-tech); --btn-fg: #04141b; }
.btn--tech:hover { box-shadow: var(--glow-cyan); }

.btn--sm { padding: 11px 20px; font-size: 0.9rem; }

.btn--block { width: 100%; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--cyan);
  font-size: 0.95rem;
}
.link-arrow svg { transition: transform 0.25s var(--ease); }
.link-arrow:hover svg { transform: translateX(4px); }

/* ---------- 5. 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
.site-header.is-stuck {
  border-bottom-color: var(--line);
  background: var(--header-bg-2);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
}
.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: var(--grad-heat);
  color: #1a0a02;
  flex: none;
}
.brand-mark svg { width: 22px; height: 22px; }
.brand-mark {
  font-size: 13.5px;
  font-weight: 800;
  letter-spacing: 0.03em;
  line-height: 1;
  font-family: var(--font-mono);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 1.12rem; letter-spacing: 0.02em; }
.brand-text em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--text-3);
}

.main-nav ul { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  display: block;
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.2s, background 0.2s;
}
.main-nav a:hover { color: var(--text); background: var(--hover-soft); }
.main-nav a.is-active { color: var(--cyan); background: var(--soft-cyan-2); }

.header-cta { display: flex; align-items: center; gap: 14px; }
.header-phone {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: border-color 0.2s, color 0.2s;
}
.header-phone svg { color: var(--amber); }
.header-phone:hover { border-color: var(--amber); color: var(--amber); }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 12px;
  cursor: pointer;
  place-items: center;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  position: relative;
  transition: background 0.2s;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--text);
  transition: transform 0.25s var(--ease), top 0.25s;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

.theme-toggle {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.theme-toggle:hover { color: var(--cyan); border-color: var(--cyan); background: var(--soft-cyan); }
.theme-toggle svg { width: 19px; height: 19px; }
.theme-toggle .icon-moon { display: none; }
.theme-toggle[aria-pressed="true"] .icon-sun { display: none; }
.theme-toggle[aria-pressed="true"] .icon-moon { display: block; }

/* ---------- 6. 首屏 Hero ---------- */
.hero {
  position: relative;
  padding: clamp(60px, 8vw, 104px) 0 clamp(56px, 7vw, 92px);
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 120%;
  background:
    radial-gradient(38% 46% at 18% 28%, var(--wash-orange), transparent 70%),
    radial-gradient(42% 52% at 78% 22%, var(--wash-cyan), transparent 72%);
  z-index: -2;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--grid-line-2) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-2) 1px, transparent 1px);
  background-size: 62px 62px;
  -webkit-mask-image: radial-gradient(ellipse 70% 64% at 50% 46%, #000 5%, transparent 76%);
  mask-image: radial-gradient(ellipse 70% 64% at 50% 46%, #000 5%, transparent 76%);
  z-index: -1;
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.hero h1 { margin-bottom: 22px; }
.hero h1 .accent {
  background: var(--grad-heat);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead { font-size: clamp(1rem, 1.3vw, 1.12rem); max-width: 56ch; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-badge);
  font-size: 0.82rem;
  color: var(--text-2);
}
.badge i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  flex: none;
}
.badge--heat i { background: var(--amber); box-shadow: 0 0 10px var(--amber); }

/* Hero 右侧设备示意 */
.hero-visual { position: relative; margin-bottom: 40px; }
.hero-visual__frame {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--frame-a), var(--frame-b));
  padding: 22px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-visual__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(60% 50% at 70% 0%, var(--wash-cyan-2), transparent 70%);
  pointer-events: none;
}
.hero-visual__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.hero-visual__bar span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-500);
}
.hero-visual__bar span:first-child { background: var(--amber); }
.hero-visual__bar span:nth-child(2) { background: var(--cyan); }
.hero-visual__bar em {
  margin-left: auto;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-3);
}
.hero-visual svg { width: 100%; height: auto; }

.hero-spec {
  position: absolute;
  right: -52px;
  bottom: -40px;
  width: min(288px, 80%);
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line-2);
  background: var(--panel);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}
.hero-spec dl { display: grid; gap: 8px; }
.hero-spec div { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.hero-spec dt { font-size: 0.82rem; color: var(--text-3); }
.hero-spec dd { font-family: var(--font-mono); font-size: 0.95rem; color: var(--text); }
.hero-spec dd b { color: var(--amber); }

/* 呼吸/信号动画 */
.pulse { animation: pulse 3.4s ease-in-out infinite; transform-origin: center; }
@keyframes pulse {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 1; }
}
.dash { stroke-dasharray: 6 8; animation: dashmove 2.6s linear infinite; }
@keyframes dashmove {
  to { stroke-dashoffset: -56; }
}
.flicker { animation: flicker 4.5s ease-in-out infinite; }
@keyframes flicker {
  0%, 92%, 100% { opacity: 1; }
  94% { opacity: 0.4; }
  96% { opacity: 0.9; }
}

/* ---------- 7. 数据条 ---------- */
.stat-strip {
  border-block: 1px solid var(--line);
  background: var(--ink-850);
}
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}
.stat {
  padding: 34px 26px;
  background: var(--ink-850);
}
.stat b {
  display: block;
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
  font-weight: 800;
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
  line-height: 1.1;
  white-space: nowrap;
}
.stat b span {
  background: var(--grad-tech);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.stat b i { font-style: normal; font-size: 0.52em; margin-left: 3px; color: var(--cyan); }
.stat > span { display: block; margin-top: 10px; font-size: 0.9rem; color: var(--text-3); }

/* ---------- 8. 卡片通用 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(170deg, var(--card-a), var(--card-b));
  padding: 26px;
  transition: transform 0.3s var(--ease), border-color 0.3s, box-shadow 0.3s;
  overflow: hidden;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(70% 60% at 50% 0%, var(--soft-cyan-2), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.card:hover { transform: translateY(-5px); border-color: var(--line-2); box-shadow: var(--shadow); }
.card:hover::after { opacity: 1; }

.card__icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  border: 1px solid var(--line);
  background: var(--soft-cyan);
  color: var(--cyan);
  margin-bottom: 18px;
}
.card__icon svg { width: 23px; height: 23px; }
.card__icon--heat { background: var(--soft-heat); color: var(--amber); }
.card h3 { margin-bottom: 10px; }
.card p { font-size: 0.95rem; }

.card__no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--text-3);
  margin-bottom: 14px;
}

/* 产品卡 */
.product-card { padding: 0; }
.product-card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  padding: 20px;
  background:
    radial-gradient(60% 60% at 50% 30%, var(--soft-cyan-2), transparent 70%),
    var(--ink-800);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.product-card__media svg { width: 82%; height: auto; }
.product-card__media img { width: 100%; height: 100%; object-fit: cover; }
.product-card__tag {
  position: absolute;
  left: 14px;
  top: 14px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--soft-heat-2);
  border: 1px solid var(--border-heat);
  color: var(--amber);
  font-size: 0.75rem;
  font-family: var(--font-mono);
}
.product-card__body { padding: 22px 24px 26px; display: flex; flex-direction: column; gap: 14px; flex: 1; }
.product-card h3 { font-size: 1.06rem; }
.product-card h3 a:hover { color: var(--cyan); }
.product-card__specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}
.spec-chip {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-2);
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--input-bg);
}
.product-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

/* 行业 / 优势卡 */
.industry-card { align-items: flex-start; }
.industry-card h3 { font-size: 1.02rem; }

/* 案例卡 */
.case-card { padding: 0; }
.case-card__top {
  padding: 24px 26px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}
.case-card__top b {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--grad-heat);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.case-card__top span { font-size: 0.8rem; color: var(--text-3); font-family: var(--font-mono); }
.case-card__body { padding: 22px 26px 26px; }
.case-card__body h3 { margin-bottom: 10px; font-size: 1.05rem; }
.case-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

/* 新闻卡 */
.news-card { gap: 14px; }
.news-card time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-3);
  letter-spacing: 0.06em;
}
.news-card h3 { font-size: 1.05rem; }
.news-card h3 a:hover { color: var(--cyan); }
.news-card p {
  font-size: 0.92rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 新闻列表（行式） */
.post-list { display: grid; gap: 0; }
.post-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) auto;
  gap: 26px;
  align-items: center;
  padding: 26px 4px;
  border-bottom: 1px solid var(--line);
  transition: background 0.25s, padding 0.25s;
}
.post-item:hover { background: var(--soft-block-2); padding-inline: 16px; }
.post-item__date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-3);
  line-height: 1.4;
}
.post-item__date b { display: block; font-size: 1.5rem; color: var(--text); font-weight: 700; }
.post-item h3 { font-size: 1.1rem; margin-bottom: 8px; }
.post-item h3 a:hover { color: var(--cyan); }
.post-item p { font-size: 0.92rem; color: var(--text-3); }
.post-item__go { color: var(--cyan); }

/* ---------- 9. 筛选 chips ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 34px;
}
.chip {
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--text-2);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.22s var(--ease);
}
.chip:hover { color: var(--text); border-color: var(--line-2); }
.chip[aria-pressed="true"] {
  color: #04141b;
  background: var(--grad-tech);
  border-color: transparent;
  font-weight: 600;
}

/* ---------- 10. 规格表 ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.94rem;
}
.spec-table caption {
  text-align: left;
  padding: 0 0 14px;
  color: var(--text-3);
  font-size: 0.85rem;
}
.spec-table th,
.spec-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}
.spec-table tr:last-child th,
.spec-table tr:last-child td { border-bottom: 0; }
.spec-table th {
  width: 34%;
  color: var(--text-3);
  font-weight: 500;
  background: var(--surface-badge);
}
.spec-table td { font-family: var(--font-mono); color: var(--text); }
.spec-table td b { color: var(--amber); }

/* ---------- 11. 流程时间轴 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 20px;
  counter-reset: step;
}
.step {
  position: relative;
  padding-top: 42px;
  counter-increment: step;
}
.step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--amber);
  letter-spacing: 0.12em;
}
.step::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 26px;
  height: 1px;
  background: var(--line);
}
.step::marker { content: ""; }
.step h3 { font-size: 1.02rem; margin-bottom: 8px; }
.step p { font-size: 0.9rem; }
.step__dot {
  position: absolute;
  left: 0;
  top: 21px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  z-index: 1;
}

/* ---------- 12. 表单 ---------- */
.form-grid { display: grid; gap: 18px; }
.form-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.field { display: grid; gap: 8px; }
.field label { font-size: 0.88rem; color: var(--text-2); }
.field label .req { color: var(--amber); }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field input::placeholder,
.field textarea::placeholder { color: var(--text-3); }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 212, 240, 0.15);
}
.field textarea { min-height: 130px; resize: vertical; }
.form-note { font-size: 0.82rem; color: var(--text-3); }
.form-status { font-size: 0.88rem; min-height: 1.4em; }
.form-status.is-ok { color: var(--ok); }
.form-status.is-err { color: var(--danger); }

/* ---------- 13. CTA 区块 ---------- */
.cta-band {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(130deg, var(--soft-heat-3), var(--soft-cyan-2)),
    var(--ink-700);
  padding: clamp(34px, 5vw, 58px);
}
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--grid-line-3) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-3) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 70% 90% at 80% 50%, #000, transparent 72%);
  mask-image: radial-gradient(ellipse 70% 90% at 80% 50%, #000, transparent 72%);
  pointer-events: none;
}
.cta-band__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 40px;
  align-items: center;
}
.cta-band h2 { margin-bottom: 14px; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 26px; }

.contact-quick { display: grid; gap: 18px; }
.contact-quick__item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
}
.contact-quick__item svg { color: var(--amber); flex: none; margin-top: 3px; }
.contact-quick__item span { display: block; font-size: 0.8rem; color: var(--text-3); }
.contact-quick__item b { font-size: 1.02rem; font-family: var(--font-mono); }

/* ---------- 14. 内页页头 / 面包屑 ---------- */
.page-hero {
  position: relative;
  padding: clamp(52px, 6vw, 84px) 0 clamp(40px, 5vw, 62px);
  border-bottom: 1px solid var(--line);
  background: var(--ink-850);
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(50% 80% at 82% 10%, var(--wash-cyan-2), transparent 70%),
    radial-gradient(40% 70% at 8% 90%, var(--wash-orange-2), transparent 70%);
  pointer-events: none;
}
.page-hero .container { position: relative; }
.page-hero h1 { margin-bottom: 14px; }
.page-hero p { max-width: 68ch; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-3);
  margin-bottom: 22px;
}
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb li::after { content: "/"; margin-left: 8px; color: var(--line-2); }
.breadcrumb li:last-child::after { content: none; }
.breadcrumb li { display: flex; align-items: center; }

/* ---------- 15. 详情页布局 ---------- */
.detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: clamp(28px, 4vw, 54px);
  align-items: start;
}

.detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}
.detail-media {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(65% 65% at 50% 35%, var(--soft-cyan-2), transparent 72%),
    var(--ink-800);
  padding: 26px;
  display: grid;
  place-items: center;
}
.detail-media svg { width: 100%; height: auto; }
.detail-media img { width: 100%; height: auto; border-radius: 12px; }

.detail-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.detail-specs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 26px 0;
}
.detail-specs div {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--soft-block);
}
.detail-specs span { display: block; font-size: 0.78rem; color: var(--text-3); margin-bottom: 4px; }
.detail-specs b { font-family: var(--font-mono); font-size: 1rem; }

.prose { max-width: 74ch; }
.prose h2 {
  font-size: 1.35rem;
  margin: 40px 0 14px;
  padding-left: 16px;
  border-left: 3px solid var(--amber);
}
.prose h3 { font-size: 1.12rem; margin: 28px 0 10px; }
.prose p { margin-bottom: 16px; }
.prose ul { display: grid; gap: 10px; margin: 0 0 18px; }
.prose ul li {
  position: relative;
  padding-left: 24px;
  color: var(--text-2);
  font-size: 0.97rem;
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.68em;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--cyan);
}
.prose blockquote {
  margin: 24px 0;
  padding: 18px 22px;
  border-left: 3px solid var(--cyan);
  background: var(--soft-cyan-3);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-2);
  font-size: 0.95rem;
}

.sidebar { display: grid; gap: 22px; position: sticky; top: 96px; }
.sidebar-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(170deg, var(--card-a), var(--card-b));
  padding: 24px;
}
.sidebar-card h3 {
  font-size: 1rem;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.sidebar-list { display: grid; gap: 4px; }
.sidebar-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.92rem;
  color: var(--text-2);
  transition: background 0.2s, color 0.2s;
}
.sidebar-list a::after { content: "›"; color: var(--text-3); }
.sidebar-list a:hover,
.sidebar-list a.is-active { background: var(--soft-cyan-2); color: var(--cyan); }

.sidebar-cta {
  border: 1px solid var(--border-heat-2);
  background: linear-gradient(160deg, var(--soft-heat-4), var(--frame-b));
}
.sidebar-cta b { display: block; font-family: var(--font-mono); font-size: 1.3rem; margin: 10px 0 12px; }

/* ---------- 16. 分页 ---------- */
.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 44px;
}
.pagination a,
.pagination span {
  min-width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-2);
  transition: all 0.2s;
}
.pagination a:hover { border-color: var(--cyan); color: var(--cyan); }
.pagination .is-current {
  background: var(--grad-tech);
  border-color: transparent;
  color: #04141b;
  font-weight: 700;
}
.pagination .is-disabled { opacity: 0.4; pointer-events: none; }

/* {page:bar}（PbootCMS 输出）适配 */
.pagination .page-status,
.pagination .page-none {
  min-width: 0;
  height: auto;
  display: inline;
  padding: 0;
  border: none;
  border-radius: 0;
  color: var(--muted);
  font-size: 0.85rem;
}
.pagination .page-numbar { display: contents; }
.pagination span.page-num {
  min-width: 0;
  height: auto;
  padding: 0 4px;
  border: none;
  color: var(--text-3);
}
.pagination .page-num-current {
  background: var(--grad-tech);
  border-color: transparent;
  color: #04141b;
  font-weight: 700;
  pointer-events: none;
}

/* 服务端分类链接形态的筛选标签 */
a.chip { text-decoration: none; }
.chip[aria-current="page"] {
  color: #04141b;
  background: var(--grad-tech);
  border-color: transparent;
  font-weight: 600;
}

/* 面包屑最后一级为当前页（指向自身的链接，弱化显示） */
.breadcrumb li:last-child a { color: inherit; pointer-events: none; }

/* ---------- 17. 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--ink-850);
  padding: clamp(52px, 6vw, 76px) 0 34px;
  font-size: 0.93rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1fr 1.1fr;
  gap: 40px;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--line);
}
.footer-brand p { margin-top: 16px; font-size: 0.9rem; max-width: 34ch; }
.footer-col h2 {
  font-size: 0.95rem;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { color: var(--text-2); font-size: 0.9rem; }
.footer-col a:hover { color: var(--cyan); }
.footer-contact li { display: flex; gap: 10px; color: var(--text-2); font-size: 0.9rem; }
.footer-contact svg { color: var(--amber); flex: none; margin-top: 4px; }
.footer-contact b { font-family: var(--font-mono); color: var(--text); }

.footer-qr {
  position: relative;
  width: 144px;
  height: 144px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-soft-2);
  padding: 6px;
}
.footer-qr img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 9px;
  background: #fff;
  display: block;
}
.footer-qr .qr-badge {
  position: absolute;
  top: -9px;
  right: -9px;
  width: 26px;
  height: 26px;
  border-radius: 9px;
  background: #07c160;
  display: grid;
  place-items: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
}
.footer-qr .qr-badge svg { width: 16px; height: 16px; display: block; }
.qr-hint {
  margin-top: 10px;
  font-size: 0.92rem;
  color: var(--text-3);
}
.qr-hint b { font-family: var(--font-mono); color: var(--text-2); font-weight: 600; }

.footer-bottom {
  padding-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  align-items: center;
  justify-content: space-between;
  color: var(--text-3);
  font-size: 0.84rem;
}
.footer-bottom a:hover { color: var(--cyan); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 16px; }

/* 回到顶部 */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-2);
  border-radius: 50%;
  background: var(--panel-soft-3);
  color: var(--text);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s var(--ease);
  z-index: 90;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--cyan); color: var(--cyan); }

/* ---------- 18. 滚动进入动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}
.reveal.is-in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }
.reveal[data-delay="4"] { transition-delay: 0.32s; }
.reveal[data-delay="5"] { transition-delay: 0.4s; }

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-spec { position: static; width: 100%; margin-top: 22px; }
  .detail-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 34px; }
  .cta-band__inner { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav-toggle { display: grid; }
  /* 关键：backdrop-filter（含 -webkit- 前缀）会让 .site-header 成为 fixed 子元素的包含块，
     里面的抽屉菜单 .main-nav 的 inset:0 / height 会以 77px 高的头部为参照，
     实测抽屉只有 122px 高、铺不满屏幕。移动端改用不透明底色，去掉毛玻璃，
     同时省掉移动端每帧做高斯模糊的开销。 */
  .site-header {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: var(--ink-900);
  }
  /* 关闭时用 display:none，避免抽屉停在屏幕外侧把页面撑出横向滚动条
     （用 translateX 隐藏会撑宽文档，实测可使移动端左右拖动） */
  .main-nav {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(320px, 84vw);
    background: var(--ink-800);
    border-left: 1px solid var(--line);
    padding: 92px 22px 30px;
    z-index: 105;
    overflow-y: auto;
    display: none;
  }
  .main-nav.is-open {
    display: block;
    animation: drawer-in 0.34s var(--ease);
  }
  @keyframes drawer-in {
    from { transform: translateX(100%); }
    to { transform: none; }
  }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 4px; }
  .main-nav a { padding: 14px 16px; border-radius: 12px; font-size: 1rem; }
  .header-phone span { display: none; }
  .nav-scrim {
    position: fixed;
    inset: 0;
    background: var(--scrim);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s;
    /* 必须低于 .site-header 的 z-index:100：抽屉 .main-nav 在 header 的层叠上下文内部，
       它自己的 z-index:105 出不了 header 这一层。遮罩若高于 100，会盖在抽屉上方，
       遮罩会拦住抽屉里所有链接的点击（实测点菜单项只会关掉抽屉）。
       99 仍高于页面内容与 .to-top(90)。 */
    z-index: 99;
  }
  .nav-scrim.is-open { opacity: 1; visibility: visible; }

  .sec-head { flex-direction: column; align-items: flex-start; gap: 18px; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .detail-hero { grid-template-columns: 1fr; }
  .post-item { grid-template-columns: 74px minmax(0, 1fr); gap: 18px; }
  .post-item__go { display: none; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  :root { --gutter: 18px; }
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 26px; }
  .detail-specs { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { width: 100%; }
  .stat { padding: 26px 20px; }
}

/* ---------- 20. 可访问性与打印 ---------- */
@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;
  }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  .site-header,
  .to-top,
  .cta-band,
  .site-footer { display: none; }
  body { background: #fff; color: #000; }
  .card,
  .sidebar-card { border-color: #ccc; }
}

/* ===================== FAQ ===================== */
.faq-card__q {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 7px;
  background: var(--grad-heat);
  color: #1a0a02;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 13px;
  line-height: 1;
  margin-right: 10px;
  vertical-align: -4px;
}
.faq-q {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--grad-heat);
  color: #1a0a02;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 15px;
  line-height: 1;
}
h1 .faq-q {
  display: inline-grid;
  width: 34px;
  height: 34px;
  font-size: 17px;
  border-radius: 10px;
  margin-right: 12px;
  vertical-align: 3px;
}