/* ==========================================================================
   Volta · 沃尔塔 —— 车载电子企业官网主题
   设计基调：工业科技感 / 简洁大气 / 浅色优先
   配色 70-20-10：70% 浅蓝灰中性底 · 20% 深墨蓝文字 · 10% 电光蓝点缀
   ========================================================================== */

:root {
  /* 品牌色 */
  --v-blue: #1f5eff;
  --v-blue-deep: #1442c8;
  --v-cyan: #00b3e6;
  --v-ink: #0c1425;

  /* 语义色 */
  --bg: #f6f8fc;
  --bg-alt: #eef2f9;
  --surface: #ffffff;
  --text: #0c1425;
  --text-soft: #4a5a78;
  --text-mute: #7b8aa6;
  --border: #dfe6f3;
  --border-soft: #eaf0f9;

  /* 排版 */
  --font-display: 'Space Grotesk', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Space Grotesk', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* 尺度 */
  --container: 1200px;
  --radius: 16px;
  --radius-sm: 10px;
  --header-h: 72px;

  --shadow-sm: 0 1px 2px rgba(12, 20, 37, .04), 0 4px 14px rgba(12, 20, 37, .05);
  --shadow-md: 0 8px 30px rgba(12, 20, 37, .08);
  --shadow-lg: 0 20px 60px rgba(12, 20, 37, .12);

  --ease: cubic-bezier(.22, .61, .36, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  /* 纵深：顶部冷光 + 极细网格底纹，避免纯白平铺 */
  background-image:
    radial-gradient(900px 520px at 78% -8%, rgba(31, 94, 255, .10), transparent 62%),
    radial-gradient(700px 420px at 8% 4%, rgba(0, 179, 230, .07), transparent 60%),
    linear-gradient(transparent 0 0);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--v-blue); text-decoration: none; transition: color .18s var(--ease); }
a:hover { color: var(--v-blue-deep); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: 0 0 .6em;
  color: var(--v-ink);
}

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

:focus-visible {
  outline: 3px solid rgba(31, 94, 255, .45);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--v-ink);
  color: #fff;
  padding: 12px 20px;
  border-radius: 0 0 10px 0;
}
.skip-link:focus { left: 0; }

/* ==========================================================================
   头部
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 248, 252, .78);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}
.site-header.is-stuck {
  background: rgba(255, 255, 255, .9);
  border-bottom-color: var(--border);
  box-shadow: 0 6px 24px rgba(12, 20, 37, .06);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--v-ink);
  flex-shrink: 0;
}
.brand:hover { color: var(--v-ink); }
.brand-mark { display: flex; color: var(--v-blue); }
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: .01em;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.site-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: .95rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: 8px;
}
.site-nav a:hover { color: var(--v-ink); background: rgba(31, 94, 255, .06); }
.site-nav a.active { color: var(--v-blue); }
.site-nav a.active::after {
  content: '';
  position: absolute;
  left: 14px; right: 14px; bottom: 8px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--v-blue), var(--v-cyan));
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 8px;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 12px;
  font-family: var(--font-display);
  font-size: .84rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--text-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  transition: all .2s var(--ease);
}
.lang-switch:hover {
  color: var(--v-blue);
  border-color: rgba(31, 94, 255, .5);
  background: rgba(31, 94, 255, .06);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 26px;
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .01em;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .18s var(--ease), box-shadow .22s var(--ease), background .22s var(--ease), color .22s var(--ease);
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--v-blue) 0%, var(--v-blue-deep) 60%, #0b3bb5 100%);
  box-shadow: 0 6px 20px rgba(31, 94, 255, .28);
}
.btn-primary:hover {
  color: #fff;
  box-shadow: 0 10px 30px rgba(31, 94, 255, .38);
  transform: translateY(-2px);
}

.btn-sm { min-height: 44px; padding: 0 20px; font-size: .88rem; }

.btn-ghost {
  color: var(--v-ink);
  background: var(--surface);
  border-color: var(--border);
}
.btn-ghost:hover {
  color: var(--v-blue);
  border-color: rgba(31, 94, 255, .45);
  background: rgba(31, 94, 255, .05);
  transform: translateY(-2px);
}

.btn-light {
  color: var(--v-ink);
  background: #fff;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .16);
}
.btn-light:hover { color: var(--v-ink); transform: translateY(-2px); box-shadow: 0 12px 32px rgba(0, 0, 0, .22); }

.btn-ghost-light {
  color: #fff;
  border-color: rgba(255, 255, 255, .45);
  background: rgba(255, 255, 255, .08);
}
.btn-ghost-light:hover { color: #fff; background: rgba(255, 255, 255, .18); transform: translateY(-2px); }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 3.5px auto;
  border-radius: 2px;
  background: var(--v-ink);
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero { position: relative; padding: 72px 0 8px; overflow: hidden; }
.hero::before {
  content: '';
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 620px;
  background:
    radial-gradient(closest-side, rgba(31, 94, 255, .13), transparent 70%),
    radial-gradient(closest-side at 80% 60%, rgba(0, 179, 230, .12), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
  padding-bottom: 56px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 7px 16px;
  font-family: var(--font-display);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--v-blue-deep);
  background: rgba(31, 94, 255, .08);
  border: 1px solid rgba(31, 94, 255, .18);
  border-radius: 999px;
}
.hero-eyebrow::before {
  content: '';
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--v-cyan);
  box-shadow: 0 0 0 4px rgba(0, 179, 230, .18);
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .55; transform: scale(.82); }
}

.hero-title {
  margin: 0 0 22px;
  font-size: clamp(2.5rem, 5.4vw, 4.15rem);
  line-height: 1.1;
  letter-spacing: -.025em;
  background: linear-gradient(135deg, var(--v-ink) 8%, #1b2c52 45%, var(--v-blue) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--v-ink);
}

.hero-sub {
  max-width: 34em;
  margin: 0 0 34px;
  font-size: 1.08rem;
  color: var(--text-soft);
}

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

/* Hero 插画 */
.hero-visual { position: relative; }
.hero-art { width: 100%; }

.trace-ring { transform-origin: 290px 205px; animation: spin 46s linear infinite; }
.trace-ring-2 { animation-duration: 68s; animation-direction: reverse; }
@keyframes spin { to { transform: rotate(360deg); } }

.chip { animation: float 7s ease-in-out infinite; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.pulse-line {
  stroke-dasharray: 120;
  stroke-dashoffset: 120;
  animation: dash 3.4s var(--ease) infinite;
}
@keyframes dash {
  0% { stroke-dashoffset: 120; }
  55%, 100% { stroke-dashoffset: -120; }
}

.badge { animation: float 8s ease-in-out infinite; }
.badge-b { animation-delay: -3s; }

/* 数据条 */
.hero-stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 8px;
  padding: 26px 0 30px;
  background: var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.stat {
  background: var(--surface);
  padding: 12px 20px;
  text-align: center;
}
.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--v-ink);
}
.stat-count { color: var(--v-blue); }
.stat-label {
  display: block;
  margin-top: 4px;
  font-size: .88rem;
  color: var(--text-mute);
}

/* ==========================================================================
   通用区块
   ========================================================================== */
.section { padding: 96px 0; }
.section-alt {
  background: linear-gradient(180deg, var(--bg-alt), #f2f6fc);
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
}

.section-eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--v-blue);
}

.section-title {
  margin: 0;
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  letter-spacing: -.02em;
}
.section-title-sm { font-size: clamp(1.35rem, 2.4vw, 1.75rem); }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-display);
  font-size: .92rem;
  font-weight: 600;
  color: var(--v-blue);
  min-height: 44px;
}
.text-link::after {
  content: '';
  width: 16px; height: 16px;
  background: currentColor;
  clip-path: polygon(2px 7px, 10px 2px, 10px 6px, 15px 6px, 15px 10px, 10px 10px, 10px 14px);
  transition: transform .2s var(--ease);
}
.text-link:hover::after { transform: translateX(4px); }

/* 滚动显现 */
.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ==========================================================================
   关于我们
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-media img,
.about-placeholder {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about-placeholder { background: #eef2f9; }
.about-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }

.about-text {
  margin: 0 0 26px;
  font-size: 1.06rem;
  color: var(--text-soft);
}

/* ==========================================================================
   产品卡片
   ========================================================================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(31, 94, 255, .28);
}

.product-media {
  display: block;
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(31, 94, 255, .06), rgba(0, 179, 230, .06)),
    var(--bg-alt);
}
.product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .55s var(--ease);
}
.product-card:hover .product-media img { transform: scale(1.06); }

.product-media-empty::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 42%, rgba(31, 94, 255, .14), transparent 55%),
    repeating-linear-gradient(135deg, rgba(12, 20, 37, .035) 0 12px, transparent 12px 24px);
}
.product-media-empty::before {
  content: attr(data-fallback);
  position: absolute;
  left: 0; right: 0; bottom: 16px;
  z-index: 1;
  text-align: center;
  font-family: var(--font-display);
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--text-mute);
}

.product-body { padding: 22px 24px 24px; display: flex; flex-direction: column; flex: 1; }
.product-name {
  margin: 0 0 10px;
  font-size: 1.16rem;
  line-height: 1.4;
}
.product-name a { color: var(--v-ink); }
.product-name a:hover { color: var(--v-blue); }

.product-summary {
  margin: 0 0 18px;
  font-size: .95rem;
  color: var(--text-soft);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.product-link { margin-top: auto; }

/* 空状态 */
.empty-state {
  padding: 72px 24px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .6);
}
.empty-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--v-ink);
}
.empty-tip { margin: 0; color: var(--text-mute); font-size: .95rem; }

/* ==========================================================================
   核心优势
   ========================================================================== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.why-card {
  padding: 30px 26px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.why-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }

.why-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  margin-bottom: 18px;
  border-radius: 12px;
  color: var(--v-blue);
  background: linear-gradient(135deg, rgba(31, 94, 255, .12), rgba(0, 179, 230, .12));
  border: 1px solid rgba(31, 94, 255, .18);
}
.why-title { margin: 0 0 8px; font-size: 1.08rem; }
.why-desc { margin: 0; font-size: .94rem; color: var(--text-soft); }

/* ==========================================================================
   CTA
   ========================================================================== */
.cta-band {
  position: relative;
  padding: 84px 0;
  color: #fff;
  background:
    radial-gradient(600px 300px at 20% 0%, rgba(0, 179, 230, .35), transparent 65%),
    linear-gradient(120deg, #0c1425 0%, #12275c 55%, #1442c8 100%);
  overflow: hidden;
}
.cta-band::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(closest-side at 50% 50%, #000, transparent 85%);
  -webkit-mask-image: radial-gradient(closest-side at 50% 50%, #000, transparent 85%);
  pointer-events: none;
}
.cta-inner { position: relative; z-index: 1; text-align: center; max-width: 780px; }
.cta-title {
  margin: 0 0 14px;
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  color: #fff;
  letter-spacing: -.02em;
}
.cta-sub { margin: 0 0 32px; font-size: 1.05rem; color: rgba(255, 255, 255, .78); }
.cta-actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--v-ink);
  color: rgba(255, 255, 255, .7);
  padding: 68px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 52px;
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}
.footer-slogan { font-size: .95rem; margin-bottom: 12px; }
.footer-addr { font-size: .92rem; color: rgba(255, 255, 255, .5); }

.footer-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: .84rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .45);
}
.footer-col a {
  display: block;
  min-height: 36px;
  font-size: .95rem;
  color: rgba(255, 255, 255, .72);
}
.footer-col a:hover { color: #fff; }

.footer-line { margin: 0 0 10px; font-size: .93rem; line-height: 1.6; }
.footer-label {
  display: inline-block;
  min-width: 46px;
  font-family: var(--font-display);
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .38);
}

.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); }
.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  align-items: center;
  justify-content: space-between;
  padding: 22px 24px;
}
.footer-copy, .footer-powered { margin: 0; font-size: .86rem; color: rgba(255, 255, 255, .45); }
.footer-copy .sep { margin: 0 8px; opacity: .5; }
.footer-powered a { color: rgba(255, 255, 255, .66); }
.footer-powered a:hover { color: #fff; }

/* ==========================================================================
   内页通用（页面头图 / 面包屑 / 详情）
   ========================================================================== */
.page-hero {
  padding: 64px 0 44px;
  background:
    radial-gradient(700px 320px at 85% -20%, rgba(31, 94, 255, .12), transparent 65%),
    linear-gradient(180deg, #eef2f9, var(--bg));
  border-bottom: 1px solid var(--border-soft);
}
.page-title { margin: 0; font-size: clamp(1.9rem, 4vw, 2.8rem); letter-spacing: -.02em; }
.page-sub { margin: 14px 0 0; font-size: 1.05rem; color: var(--text-soft); max-width: 46em; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 26px 0 0;
  font-size: .9rem;
  color: var(--text-mute);
}
.breadcrumb a { color: var(--text-soft); }
.breadcrumb a:hover { color: var(--v-blue); }
.crumb-sep { opacity: .45; }
.crumb-current { color: var(--v-ink); }

.product-detail { padding: 34px 0 20px; }
.detail-head { margin-bottom: 28px; }
.detail-title { margin: 0 0 12px; font-size: clamp(1.7rem, 3.6vw, 2.5rem); letter-spacing: -.02em; }
.detail-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .9rem;
  color: var(--text-mute);
}
.detail-meta .sep { opacity: .5; }

.detail-media {
  margin: 0 0 34px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--bg-alt);
}
.detail-media img { width: 100%; max-height: 560px; object-fit: cover; }

/* 正文排版 */
.post-content { font-size: 1.05rem; color: #2b3a58; max-width: 68ch; }
.page-content-wrap .post-content { max-width: 76ch; }
.post-content h2 { margin-top: 1.8em; font-size: 1.5rem; }
.post-content h3 { margin-top: 1.6em; font-size: 1.22rem; }
.post-content p { margin: 0 0 1.2em; }
.post-content ul, .post-content ol { margin: 0 0 1.3em; padding-left: 1.4em; }
.post-content li { margin-bottom: .5em; }
.post-content img { border-radius: var(--radius-sm); margin: 8px 0 20px; }
.post-content blockquote {
  margin: 0 0 1.4em;
  padding: 14px 22px;
  border-left: 3px solid var(--v-blue);
  background: rgba(31, 94, 255, .05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-soft);
}
.post-content a { text-decoration: underline; text-underline-offset: 3px; }
.post-content table {
  width: 100%;
  margin: 0 0 1.5em;
  border-collapse: collapse;
  font-size: .96rem;
}
.post-content th, .post-content td {
  padding: 11px 14px;
  border: 1px solid var(--border);
  text-align: left;
}
.post-content th { background: var(--bg-alt); font-family: var(--font-display); }
.post-content code {
  padding: 2px 6px;
  font-size: .9em;
  background: var(--bg-alt);
  border-radius: 5px;
}
.post-content pre {
  padding: 18px 20px;
  overflow-x: auto;
  background: var(--v-ink);
  color: #d7e3ff;
  border-radius: var(--radius-sm);
}
.post-content pre code { background: none; color: inherit; padding: 0; }

.related { margin: 72px 0 20px; padding-top: 52px; border-top: 1px solid var(--border-soft); }
.related .section-title { margin-bottom: 32px; }

/* 分页 */
.pagination { display: flex; justify-content: center; gap: 10px; margin-top: 52px; }
.pagination a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 22px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .92rem;
  color: var(--text-soft);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.pagination a:hover { color: var(--v-blue); border-color: rgba(31, 94, 255, .45); }

/* 404 */
.error-page { padding: 120px 24px 140px; text-align: center; }
.error-code {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(5rem, 16vw, 9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  background: linear-gradient(135deg, var(--v-blue), var(--v-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.error-title { margin: 8px 0 12px; font-size: clamp(1.4rem, 3vw, 2rem); }
.error-sub { margin: 0 0 32px; color: var(--text-soft); }

/* ==========================================================================
   响应式 —— 移动优先向上增强，栅格逐级塌缩
   ========================================================================== */
@media (max-width: 1080px) {
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { gap: 36px; }
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .header-cta { display: none; }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
    padding: 12px 20px 20px;
    background: rgba(255, 255, 255, .97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    /* 抽屉默认收起 */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }
  .site-nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .site-nav a { min-height: 48px; padding: 0 12px; font-size: 1rem; border-radius: var(--radius-sm); }
  .site-nav a.active::after { display: none; }
  .site-nav a.active { background: rgba(31, 94, 255, .08); }

  .hero { padding-top: 44px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 460px; margin: 0 auto; }

  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .section { padding: 72px 0; }
}

@media (max-width: 720px) {
  .container { padding: 0 18px; }
  body { font-size: 16px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom-inner { justify-content: flex-start; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 14px; }
  .hero-actions .btn { flex: 1 1 auto; }
  .cta-actions .btn { width: 100%; }
}

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

@media print {
  .site-header, .cta-band, .site-footer, .nav-toggle { display: none !important; }
  body { background: #fff; color: #000; }
}