/* ============================================================
   CHAINLON 链龙 GEO 官网样式 · Tesla 风格化
   设计语言：极简 / 大留白 / 细字重 / 克制用色
   基准：特斯拉官网（黑灰白 + 单一强调色，超细标题，宽字距）
   ============================================================ */

:root {
  --accent: #2250fc;        /* 品牌蓝 · 唯一强调色，仅用于链接/悬停/细节点缀 */
  --accent-dark: #0b2ea8;
  --ink: #171a20;           /* 近黑 · 标题/强调文字 */
  --body: #393c41;          /* 正文灰 */
  --muted: #8e9298;         /* 弱化灰 */
  --line: #e5e7eb;          /* 发丝线 */
  --bg: #ffffff;
  --bg-soft: #f5f5f7;       /* 特斯拉式浅灰底 */
  --dark: #171a20;          /* 深色区块/页脚/深色按钮 */
  --radius: 16px;
  --radius-btn: 4px;        /* 特斯拉式方正按钮 */
  --shadow: 0 1px 2px rgba(23, 26, 32, .04);  /* 极轻投影 */
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--body);
  background: var(--bg);
  line-height: 1.75;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
::selection { background: rgba(34, 80, 252, .14); }
a { color: var(--accent); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--accent-dark); }

.wrap { max-width: 1140px; margin: 0 auto; padding: 0 32px; }

/* ---------- 页眉（极简白 + 发丝线） ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo-link { display: flex; align-items: center; gap: 10px; }
.logo-link img { height: 34px; width: auto; }
.main-nav { display: flex; align-items: center; gap: 30px; }
.main-nav a {
  color: var(--body); font-weight: 400; font-size: 14px;
  padding: 6px 0; border-bottom: 2px solid transparent;
}
.main-nav a:hover, .main-nav a.on { color: var(--ink); border-bottom-color: var(--ink); }
.main-nav .btn { margin-left: 6px; }
@media (max-width: 860px) {
  .main-nav { gap: 16px; font-size: 13px; }
}

/* ---------- 按钮（特斯拉式：方正、克制） ---------- */
.btn {
  display: inline-block; padding: 12px 32px;
  border-radius: var(--radius-btn);
  font-weight: 500; font-size: 14px;
  letter-spacing: .2px;
  transition: all .2s ease; cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary { background: var(--dark); color: #fff !important; border-color: var(--dark); box-shadow: 0 2px 10px rgba(23, 26, 32, .16); }
.btn-primary:hover { background: #000; border-color: #000; box-shadow: 0 8px 22px rgba(23, 26, 32, .24); }
.btn-ghost { border-color: #fff; color: #fff !important; background: transparent; }
.btn-ghost:hover { background: #fff; color: var(--ink) !important; }
.btn-outline { border-color: var(--ink); color: var(--ink) !important; background: transparent; }
.btn-outline:hover { background: var(--ink); color: #fff !important; }
.btn-white { background: #fff; color: var(--ink) !important; border-color: #fff; }
.btn-white:hover { background: var(--bg-soft); border-color: var(--bg-soft); }

/* ---------- 英雄区（极简白 · 超细大标题） ---------- */
.hero {
  position: relative;
  min-height: 84vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; color: var(--ink);
  background: var(--bg);
}
.hero-inner { position: relative; max-width: 880px; padding: 140px 24px 110px; }
.hero-kicker {
  font-size: 12px; font-weight: 500; letter-spacing: 3px;
  text-transform: uppercase; color: var(--muted); margin-bottom: 26px;
}
.hero-title {
  font-size: clamp(42px, 7vw, 74px); font-weight: 500; line-height: 1.22;
  letter-spacing: 0; color: var(--ink); margin-bottom: 28px;
}
.hero-lead {
  font-size: 17px; color: var(--body); max-width: 620px; margin: 0 auto 42px;
  font-weight: 400;
}
.hero-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
@media (max-width: 640px) {
  .hero-title { font-size: 34px; }
}

/* 小页英雄区（内页用） */
.hero-sm { min-height: 360px; }
.hero-sm .hero-inner { padding: 96px 24px 80px; }
.hero-sm .hero-title { font-size: clamp(32px, 4.6vw, 48px); }

/* ---------- 区块（大留白） ---------- */
.section { padding: 128px 0; }
.section.grey { background: var(--bg-soft); }
.section.tight { padding: 72px 0; }

.sec-head { text-align: center; max-width: 700px; margin: 0 auto 72px; }
.sec-title { font-size: clamp(30px, 4vw, 44px); font-weight: 500; color: var(--ink); margin-bottom: 18px; letter-spacing: 0; }
.sec-lead { color: var(--muted); font-size: 15px; }
/* 小英文标签：统一放在中文下方 */
.sec-en {
  font-size: 11px; font-weight: 500; letter-spacing: 2.5px;
  text-transform: uppercase; color: var(--muted); opacity: .75;
  margin-top: 10px;
}

/* ---------- 卡片栅格（发丝线 + 大圆角，去投影） ---------- */
.card-grid { display: grid; gap: 24px; }
.card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 960px) { .card-grid { grid-template-columns: 1fr 1fr !important; } }
@media (max-width: 640px) { .card-grid { grid-template-columns: 1fr !important; } }

.card {
  background: var(--bg); border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow); padding: 40px 34px;
  transition: transform .25s ease, border-color .25s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--ink); }
.card-idx {
  display: inline-block;
  font-size: 12px; font-weight: 500;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
/* 首页四大服务卡的小标：纯文字 + 实色电青底块（参照"学点新鲜的"风格） */
.svc-idx {
  display: inline-block;
  font-size: 13px; font-weight: 700;
  letter-spacing: 1px;
  color: #0f172a;
  background: #1AC8FF;
  padding: 5px 12px;
  margin-bottom: 16px;
}

/* 首页四大服务卡：统一视觉块风格 */
.svc-cards { gap: 32px; }
.svc-cards .card { padding: 44px 38px; }
.svc-cards .card .svc-title {
  font-size: 24px; font-weight: 500;
  letter-spacing: -.3px;
  margin-bottom: 18px;
}
.svc-cards .card p { line-height: 1.85; }
.svc-cards .card ul li { margin-bottom: 10px; }
.card h3 { font-size: 20px; font-weight: 600; color: var(--ink); margin-bottom: 14px; letter-spacing: 0; }
.card p { font-size: 14px; color: var(--body); }
.card ul { margin-top: 12px; padding-left: 18px; font-size: 14px; }
.card ul li { margin-bottom: 7px; color: var(--body); }

/* ---------- 数据统计（细字重 · 大数字） ---------- */
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; text-align: center; }
@media (max-width: 860px) { .stat-row { grid-template-columns: 1fr 1fr; } }
.stat .num { font-size: 54px; font-weight: 500; font-variant-numeric: tabular-nums; color: var(--ink); line-height: 1.05; letter-spacing: -1px; }
.stat .num small { font-size: 22px; font-weight: 300; }
.stat .lbl { font-weight: 500; color: var(--ink); margin: 10px 0 4px; }
.stat p { font-size: 13px; color: var(--muted); }

/* ---------- 表格（极简：透明表头 + 发丝分隔） ---------- */
.tbl-wrap { overflow-x: auto; }
.tbl {
  width: 100%; border-collapse: collapse; background: var(--bg);
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); font-size: 14px;
}
.tbl th {
  background: transparent; color: var(--ink); font-weight: 500;
  font-size: 12px; letter-spacing: 1px; text-transform: uppercase;
  padding: 18px 20px; text-align: left; white-space: nowrap;
  border-bottom: 1px solid var(--line);
}
.tbl td { padding: 16px 20px; border-bottom: 1px solid var(--line); color: var(--body); }
.tbl tr:last-child td { border-bottom: none; }
.tbl td strong { color: var(--ink); font-size: 16px; font-weight: 500; }

/* ---------- 价格阶梯 ---------- */
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 960px) { .price-grid { grid-template-columns: 1fr; } }
.price-card {
  background: var(--bg); border-radius: var(--radius);
  border: 1px solid var(--line); box-shadow: var(--shadow);
  padding: 44px 36px; text-align: center;
  transition: transform .25s ease, border-color .25s ease;
}
.price-card:hover { transform: translateY(-4px); border-color: var(--ink); }
.price-card.hot { border-color: var(--ink); position: relative; }
.price-card .hot-badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fff; font-size: 11px; font-weight: 500;
  letter-spacing: 2px; padding: 5px 16px; border-radius: 4px;
}
.price-card h3 { font-size: 20px; font-weight: 400; color: var(--ink); margin-bottom: 8px; }
.price-card .price { font-size: 46px; font-weight: 500; font-variant-numeric: tabular-nums; color: var(--ink); margin: 10px 0 4px; letter-spacing: -1px; }
.price-card .price small { font-size: 16px; font-weight: 400; }
.price-card .desc { font-size: 13px; color: var(--muted); min-height: 44px; margin-bottom: 22px; }
.price-card ul { text-align: left; font-size: 14px; padding-left: 18px; margin-bottom: 28px; }
.price-card ul li { margin-bottom: 8px; color: var(--body); }

/* ---------- 平台 chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.chip {
  background: var(--bg); border: 1px solid var(--line);
  color: var(--body); font-size: 13px; font-weight: 400;
  padding: 7px 18px 7px 7px; border-radius: 30px;
  display: inline-flex; align-items: center; gap: 8px;
  transition: all .2s ease;
}
.chip:hover { border-color: var(--ink); color: var(--ink); }
.chip-logo {
  width: 28px; height: 28px; flex-shrink: 0;
}

/* ---------- FAQ ---------- */
.faq-list { max-width: 840px; margin: 0 auto; }
.faq-item {
  background: var(--bg); border-radius: var(--radius);
  border: 1px solid var(--line); margin-bottom: 14px; overflow: hidden;
}
.faq-item summary {
  cursor: pointer; list-style: none; display: flex; align-items: center; gap: 14px;
  padding: 22px 28px; font-weight: 500; color: var(--ink); font-size: 15px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .qno { color: var(--muted); font-weight: 500; letter-spacing: 1px; flex: none; }
.faq-item summary::after {
  content: "+"; margin-left: auto; color: var(--muted);
  font-size: 22px; font-weight: 300; transition: transform .2s;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-body { padding: 0 28px 24px 64px; font-size: 14px; color: var(--body); }

/* ---------- 文章列表 ---------- */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 960px) { .post-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .post-grid { grid-template-columns: 1fr; } }
.post {
  display: block; background: var(--bg); border-radius: var(--radius);
  border: 1px solid var(--line); box-shadow: var(--shadow);
  padding: 32px 30px;
  transition: transform .25s ease, border-color .25s ease; color: var(--body);
}
.post:hover { transform: translateY(-4px); border-color: var(--ink); color: var(--body); }
.post .meta {
  font-size: 11px; font-weight: 500; color: var(--muted);
  letter-spacing: 2px; text-transform: uppercase; display: block; margin-bottom: 14px;
}
.post h3 { font-size: 18px; font-weight: 400; color: var(--ink); margin-bottom: 12px; line-height: 1.5; }
.post p { font-size: 14px; color: var(--muted); margin-bottom: 16px; }
.post .more { font-size: 13px; font-weight: 500; color: var(--ink); letter-spacing: .5px; }

/* ---------- 文章正文 ---------- */
.prose { max-width: 760px; margin: 0 auto; padding: 96px 24px; }
.prose h1 { font-size: clamp(30px, 4.6vw, 46px); font-weight: 500; color: var(--ink); line-height: 1.3; margin-bottom: 16px; letter-spacing: 0; }
.prose > .meta {
  font-size: 13px; color: var(--muted); letter-spacing: 1px;
  border-bottom: 1px solid var(--line); padding-bottom: 24px; margin-bottom: 40px; display: block;
}
.prose h2 { font-size: 24px; font-weight: 600; color: var(--ink); margin: 52px 0 18px; letter-spacing: 0; }
.prose h3 { font-size: 18px; font-weight: 400; color: var(--ink); margin: 32px 0 14px; }
.prose p { margin-bottom: 18px; }
.prose ul, .prose ol { margin: 0 0 18px 22px; }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--ink); font-weight: 500; }
.prose .tbl { margin: 24px 0; }
@media (max-width: 640px) { .prose h1 { font-size: 28px; } }

/* ---------- CTA 横带（近黑 · 细字） ---------- */
.cta-band {
  background: var(--dark);
  color: #fff; text-align: center; padding: 104px 24px;
}
.cta-band h2 { font-size: clamp(28px, 4vw, 42px); font-weight: 500; margin-bottom: 14px; letter-spacing: 0; }
.cta-band p { opacity: .8; margin-bottom: 34px; font-weight: 300; }

/* ---------- 诊断申请表单 ---------- */
.diag-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 40px; align-items: start; }
@media (max-width: 860px) { .diag-grid { grid-template-columns: 1fr; } }
.diag-side .card { margin-bottom: 24px; }
.form-card { background: var(--bg); border-radius: var(--radius); border: 1px solid var(--line); box-shadow: var(--shadow); padding: 44px 40px; }
.form-card h3 { font-size: 22px; font-weight: 300; color: var(--ink); margin-bottom: 6px; }
.form-card .form-sub { font-size: 13px; color: var(--muted); margin-bottom: 28px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 560px) { .form-grid { grid-template-columns: 1fr; } }
.field label { display: block; font-size: 13px; font-weight: 500; color: var(--ink); margin-bottom: 8px; }
.field label .req { color: var(--accent); }
.field input, .field textarea {
  width: 100%; padding: 12px 15px;
  border: 1px solid var(--line); border-radius: 8px;
  font-family: inherit; font-size: 14px; color: var(--ink);
  background: var(--bg); transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(23, 26, 32, .06); background: #fff;
}
.field textarea { min-height: 96px; resize: vertical; }
.form-note { font-size: 12px; color: var(--muted); margin: 16px 0 20px; line-height: 1.7; }
.form-ok {
  display: none; margin-top: 18px; padding: 14px 18px;
  background: var(--bg-soft); border: 1px solid var(--line);
  color: var(--ink); border-radius: 8px; font-size: 14px;
}
.form-ok.show { display: block; }

/* ---------- 页脚（近黑） ---------- */
.site-footer { background: var(--dark); color: #9aa1a9; padding: 80px 0 0; font-size: 14px; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; }
@media (max-width: 860px) { .foot-grid { grid-template-columns: 1fr; } }
.foot-grid h4 { color: #fff; font-size: 14px; font-weight: 500; margin-bottom: 18px; letter-spacing: 1px; }
.foot-grid ul { list-style: none; }
.foot-grid ul li { margin-bottom: 10px; }
.foot-grid a { color: #9aa1a9; }
.foot-grid a:hover { color: #fff; }
.foot-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.foot-brand img { height: 36px; }
.foot-tagline { color: #fff; font-size: 20px; font-weight: 400; letter-spacing: 2px; margin: 0 0 10px; }
.foot-slogan { max-width: 320px; line-height: 1.9; font-weight: 300; }
.copyright {
  border-top: 1px solid #2c2f34; margin-top: 64px;
  padding: 24px 0; text-align: center; font-size: 13px; color: #6b7280;
}
.copyright a { color: #6b7280; }
.copyright a:hover { color: #999; }

/* ============================================================
   苹果式过渡 · 滚动渐入 + 彩色径向渐变背景
   保留特斯拉式极简骨架，加入苹果产品页的微动效与彩色光晕
   ============================================================ */

/* 滚动渐入（配合 IntersectionObserver 用） */
@keyframes chainlonFadeUp {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity .9s cubic-bezier(.22, .61, .36, 1),
    transform .9s cubic-bezier(.22, .61, .36, 1);
  will-change: opacity, transform;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }
.reveal[data-delay="5"] { transition-delay: .40s; }

/* 苹果式彩色径向渐变 · hero 区背景光晕（极淡点缀） */
.hero-bg-gradient {
  position: absolute; inset: 0;
  z-index: 0; pointer-events: none;
  background:
    radial-gradient(circle at 18% 28%, rgba(34, 80, 252, .13) 0%, transparent 50%),
    radial-gradient(circle at 82% 72%, rgba(190, 52, 220, .10) 0%, transparent 54%),
    radial-gradient(circle at 50% 50%, rgba(0, 196, 204, .06) 0%, transparent 72%);
}
/* hero 区底部一道细彩色光带（苹果式收尾） */
.hero::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(34,80,252,.5) 30%, rgba(190,52,220,.4) 60%, transparent 100%);
  opacity: .55;
}
.hero-inner { position: relative; z-index: 1; }

/* hero-btns 在白底 hero 用 btn-primary + btn-outline（深色版） */
.hero-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 6px; }

/* hero 区 chips 紧凑变体 */
.hero-chips { margin-top: 40px; gap: 10px; }
.hero-chips .chip {
  font-size: 12px; padding: 5px 14px 5px 5px;
  background: rgba(255, 255, 255, .65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.hero-chips .chip-logo { width: 22px; height: 22px; }

/* 按钮过渡更顺滑（苹果式 cubic-bezier） */
.btn { transition: all .32s cubic-bezier(.22, .61, .36, 1); }
.btn:hover { transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

/* 主导航下划线动画 */
.main-nav a {
  position: relative;
  transition: color .25s ease;
}
.main-nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--ink);
  transform: scaleX(0); transform-origin: center;
  transition: transform .35s cubic-bezier(.22, .61, .36, 1);
}
.main-nav a:hover::after,
.main-nav a.on::after { transform: scaleX(1); }

/* 卡片 hover 加细微彩色描边（产品页彩条感） */
.card {
  transition:
    transform .35s cubic-bezier(.22, .61, .36, 1),
    border-color .35s cubic-bezier(.22, .61, .36, 1),
    box-shadow .35s cubic-bezier(.22, .61, .36, 1);
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(34, 80, 252, .4);
  box-shadow: 0 18px 44px rgba(23, 26, 32, .09);
}

/* 链接 hover 微动（强调色平滑过渡） */
a { transition: color .25s ease; }

/* 图片渐入：hero 主图 / chip 图加载 */
img { transition: opacity .4s ease; }

/* 平滑滚动已在 html scroll-behavior smooth 提供 */

/* ============================================================
   苹果式前卫涂鸦 · hero 浮动装饰
   渐变彩色 SVG + 弹性入场 + 持续浮动/旋转
   ============================================================ */
.hero-doodle {
  position: absolute;
  z-index: 2; pointer-events: none;
  opacity: .92;   /* 修复：基础不透明，永不消失 */
  filter: drop-shadow(0 6px 14px rgba(23, 26, 32, .08));
  will-change: transform, opacity;
}
.hero-doodle-1 {
  top: 110px; left: 5%;
  width: 88px; height: 88px;
  animation:
    doodlePop .9s cubic-bezier(.34, 1.56, .64, 1) backwards .25s,
    doodleFloat 6s ease-in-out infinite 1.15s,
    doodlePulse 6s ease-in-out infinite 1.15s;
}
.hero-doodle-2 {
  top: 80px; right: 7%;
  width: 116px; height: 116px;
  animation:
    doodlePop .9s cubic-bezier(.34, 1.56, .64, 1) backwards .45s,
    doodleSpin 22s linear infinite 1.35s,
    doodlePulse 6s ease-in-out infinite 2.65s;
}
.hero-doodle-3 {
  bottom: 130px; left: 9%;
  width: 92px; height: 92px;
  animation:
    doodlePop .9s cubic-bezier(.34, 1.56, .64, 1) backwards .65s,
    doodleFloat 7s ease-in-out infinite reverse 1.55s,
    doodlePulse 6s ease-in-out infinite 4.15s;
}
.hero-doodle-4 {
  bottom: 110px; right: 6%;
  width: 100px; height: 100px;
  animation:
    doodlePop .9s cubic-bezier(.34, 1.56, .64, 1) backwards .85s,
    doodleFloat 8s ease-in-out infinite 1.75s,
    doodlePulse 6s ease-in-out infinite 5.65s;
}
@keyframes doodlePop {
  from { opacity: 0; transform: scale(.55) rotate(-18deg); }
  to   { opacity: .92; transform: scale(1) rotate(0deg); }
}
@keyframes doodleFloat {
  0%, 100% { transform: translateY(0) rotate(-6deg); }
  50%      { transform: translateY(-14px) rotate(8deg); }
}
@keyframes doodleSpin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
@keyframes doodlePulse {
  0%, 100% { opacity: .92; }
  50%      { opacity: .55; }
}
@media (max-width: 960px) {
  .hero-doodle { display: none; } /* 小屏隐藏避免干扰 */
}
@media (prefers-reduced-motion: reduce) {
  .hero-doodle { animation: none; opacity: .92; }
}

/* ============================================================
   苹果式 highlight · 文字马克笔高亮（青色）
   用法：<span class="highlight">关键词</span>
   ============================================================ */
.highlight {
  background: linear-gradient(180deg,
    transparent 0%, transparent 52%,
    rgba(0, 196, 204, .38) 52%, rgba(0, 196, 204, .38) 92%,
    transparent 92%);
  padding: 0 4px;
  margin: 0 -4px;
}

/* ============================================================
   卡片顶部小标
   ============================================================ */