/* ===== Design Tokens · 浅蓝 × 白 · 明亮奢侈品 AI 风格 ===== */
:root {
  /* === 科技蓝点缀 · 明亮浅蓝白底 · 克制留白 === */
  --primary-red: #2E6FF2;      /* 主强调（科技蓝） */
  --deep-red: #1B55D6;         /* 科技蓝深端 */
  --medium-red: #4D8BFF;       /* 亮蓝高光 */
  --light-red: rgba(46, 111, 242, 0.10);
  --pale-red: rgba(46, 111, 242, 0.055);
  --white: #FFFFFF;            /* 纯白卡片 */
  --light-gray: #F4F7FD;       /* 极浅蓝灰底 */
  --border: #E6EDF9;           /* 浅蓝描边 */
  --text-primary: #1F2B45;     /* 主标题（深蓝灰） */
  --text-regular: #4C5B77;     /* 正文 */
  --text-secondary: #8A97AE;   /* 辅助 */

  /* 全站统一引用别名（同一套明亮蓝白系统） */
  --red: #2E6FF2;
  --red-bright: #4D8BFF;
  --red-deep: #1B55D6;
  --ink: #1F2B45;
  --ink-soft: #4C5B77;
  --ink-faint: #8A97AE;
  --card: #FFFFFF;
  --card-raised: #FFFFFF;
  --paper: #F6F9FE;            /* 页面底（纯净浅蓝白，明快） */
  --bg-deep: #EEF3FC;          /* 次级浅蓝白 */
  --bg-panel: #FFFFFF;         /* 悬浮面板白底 */
  --on-dark: #FFFFFF;          /* 深色/蓝色底上的白字 */
  --line: rgba(30, 60, 130, 0.10);
  --line-blue: rgba(46, 111, 242, 0.22);
  --shadow: 0 14px 40px rgba(40, 80, 160, 0.08);
  --shadow-strong: 0 18px 46px rgba(46, 111, 242, 0.12);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  background: var(--paper); color: var(--ink);
  font-family: var(--sans); font-weight: 300; line-height: 1.8;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
  -webkit-text-size-adjust: 100%; text-size-adjust: 100%;
}
body.preload * { transition: none !important; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; background: none; border: 0; }
img { display: block; max-width: 100%; }
.container { width: min(1120px, 90vw); margin: 0 auto; }
.red { color: var(--red); }
.br { display: block; }

/* ===== 顶部导航 ===== */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px clamp(20px, 5vw, 56px); transition: 0.4s var(--ease);
}
.site-nav.scrolled {
  background: rgba(255, 255, 255, 0.86); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line); padding: 12px clamp(20px, 5vw, 56px);
  box-shadow: 0 2px 12px rgba(40, 80, 160, 0.06);
}
.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand-mark {
  display: grid; place-items: center; padding: 6px 14px;
  background: linear-gradient(135deg, var(--red-bright), var(--red));
  color: #FFFFFF; font-family: var(--serif); font-weight: 600; font-size: 13.5px;
  letter-spacing: 2px; border-radius: 8px; white-space: nowrap;
}
.brand-line { font-family: var(--serif); font-weight: 600; letter-spacing: 3px; font-size: 17px; color: var(--ink); }
.nav-links { display: flex; align-items: center; gap: 30px; font-size: 14px; letter-spacing: 1px; color: var(--ink-soft); }
.nav-links a { position: relative; padding: 6px 0; transition: color 0.3s var(--ease); }
.nav-links a:hover { color: var(--red); }
.nav-links .nav-cta {
  color: var(--red); border: 1px solid var(--line-blue);
  padding: 8px 20px; border-radius: 999px; transition: 0.4s var(--ease);
}
.nav-links .nav-cta:hover { background: var(--red); color: #fff; border-color: var(--red); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--ink); transition: 0.35s var(--ease); }
/* 滚动后停留在浅色区 */
.site-nav.scrolled .brand-line { color: var(--text-primary); }
.site-nav.scrolled .nav-links { color: var(--text-primary); }
.site-nav.scrolled .nav-links a:hover { color: var(--primary-red); }
.site-nav.scrolled .nav-links .nav-cta { color: var(--red-bright); border-color: rgba(64,128,255,0.40); }
.site-nav.scrolled .nav-links .nav-cta:hover { background: var(--red); color: #FFFFFF; }
.site-nav.scrolled .nav-toggle span { background: var(--text-primary); }

/* ===== 开篇（浅蓝白主视觉，明亮通透） ===== */
.hero {
  position: relative; padding: clamp(120px, 18vh, 160px) 0 clamp(120px, 13vh, 168px); overflow: hidden; color: var(--ink);
  background:
    radial-gradient(circle at 78% 20%, rgba(120, 150, 255, 0.20), transparent 44%),
    radial-gradient(circle at 50% 12%, rgba(250, 195, 220, 0.32), transparent 40%),
    radial-gradient(circle at 22% 30%, rgba(190, 170, 255, 0.30), transparent 42%),
    radial-gradient(circle at 12% 92%, rgba(96, 165, 250, 0.14), transparent 46%),
    linear-gradient(120deg, #FDF6F3 0%, #F7F6FC 38%, #ECF3FF 100%);
}
.hero::before {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 120px; pointer-events: none;
  background: linear-gradient(180deg, transparent 0%, rgba(230, 240, 255, 0.96) 100%);
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(46, 111, 242, 0.22) 0.6px, transparent 0.6px);
  background-size: 5px 5px; opacity: 0.12; pointer-events: none; z-index: 0;
}
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; grid-template-rows: auto auto; gap: 28px 48px; align-items: center; position: relative; z-index: 1; }
.hero-copy { grid-column: 1; grid-row: 1 / span 2; align-self: center; }
.hero-photo { grid-column: 2; grid-row: 1; }
.hero-meta { grid-column: 2; grid-row: 2; align-self: start; }
.eyebrow { font-size: 13px; letter-spacing:4px; color: #7C8DB0; text-transform: uppercase; }
.hero .eyebrow { color: var(--red); }
.hero-title {
  font-family: var(--serif); font-weight: 700; letter-spacing: 0.01em; line-height: 1.15;
  font-size: clamp(40px, 6.5vw, 72px); margin: 20px 0 22px; color: var(--ink);
  text-shadow: 0 12px 40px rgba(46, 111, 242, 0.14);
}
.gold { color: var(--red); }
.hero-title .gold {
  color: transparent;
  background: linear-gradient(92deg, #F09BC8 0%, #C89BF7 34%, #7FB4F7 62%, #4D8BFF 100%);
  -webkit-background-clip: text;
  background-clip: text;
}
.hero-tags { display: inline-flex; flex-wrap: wrap; font-size: 15px; letter-spacing: 2px; color: var(--ink-soft); font-weight: 500; }
.hero-tags::before { content: "◆"; color: var(--red-bright); margin-right: 12px; font-size: 10px; align-self: center; }
.hero-desc { max-width: 520px; color: var(--ink-soft); font-size: 16px; letter-spacing: 0.4px; margin-top: 16px; }
.hero-actions { display: flex; gap: 16px; margin-top: 34px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 30px; border-radius: 12px; font-size: 15px; letter-spacing: 2px;
  transition: 0.5s var(--ease); border: 1px solid transparent; font-weight: 500;
}
.btn-solid { background: linear-gradient(135deg, var(--red-bright), var(--red)); color: #FFFFFF; box-shadow: 0 12px 30px rgba(46,111,242,0.28); }
.btn-solid:hover { transform: translateY(-3px); box-shadow: 0 18px 40px rgba(46,111,242,0.36); }
.btn-ghost { border-color: var(--line-blue); color: var(--ink); }
.btn-ghost:hover { background: var(--light-red); color: #FFFFFF; transform: translateY(-3px); }
.hero .btn-solid { background: var(--red); color: #FFFFFF; box-shadow: 0 14px 34px rgba(46,111,242,0.30); }
.hero .btn-solid:hover { background: var(--red-bright); transform: translateY(-3px); }
.hero .btn-ghost { border-color: rgba(46,111,242,0.35); color: var(--red); }
.hero .btn-ghost:hover { background: var(--red); color: #FFFFFF; }

.hero-photo { display: flex; flex-direction: column; align-items: center; }
.photo-frame {
  width: min(340px, 100%); aspect-ratio: 3/4; border-radius: 15px; overflow: hidden;
  border: 1px solid rgba(255,255,255,0.9);
  box-shadow: 0 24px 60px rgba(40, 80, 160, 0.16);
  background: var(--bg-deep);
}
.photo-frame img { width: 100%; height: 100%; object-fit: cover; }
.hero-meta { width: min(340px, 100%); margin: 0 auto; border-top: 1px solid var(--line); padding-top: 20px; display: flex; flex-direction: column; gap: 14px; }
.hm { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.hm-k { font-size: 12px; letter-spacing: 2px; color: var(--ink-faint); }
.hm-v { font-family: var(--serif); font-size: 14px; letter-spacing: 0.5px; color: var(--ink-soft); }

/* ===== 分区通用 ===== */
.section { padding: clamp(70px, 9vw, 110px) 0; }
.section.alt { background: var(--bg-deep); border-top: 1px solid var(--line); }
.sec-head { margin-bottom: 48px; }
.section .eyebrow { color: var(--red); }
.sec-title { font-family: var(--serif); font-weight: 700; font-size: clamp(28px, 4.5vw, 42px); margin: 12px 0 14px; letter-spacing: 0.02em; color: var(--text-primary); }
.sec-desc { color: var(--text-regular); font-size: 15.5px; max-width: 600px; letter-spacing: 0.4px; }

/* ===== 服务卡片 ===== */
.card-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 22px 22px 20px; box-shadow: 0 8px 28px rgba(0, 0, 0, 0.06); transition: transform 0.5s var(--ease), border-color 0.4s, box-shadow 0.5s var(--ease);
  position: relative; overflow: hidden;
}
.card::before {
  content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--red-bright), var(--red)); transform: scaleX(0); transform-origin: left; transition: transform 0.5s var(--ease);
}
.card:hover { transform: translateY(-4px); border-color: var(--line-blue); box-shadow: 0 14px 36px rgba(22, 93, 255, 0.20); }
.card:hover::before { transform: scaleX(1); }
.card-idx { font-family: var(--serif); color: var(--red-bright); font-size: 13px; letter-spacing: 2px; }
.card h3 { font-family: var(--serif); font-weight: 600; font-size: 19px; letter-spacing: 1.2px; margin: 6px 0 8px; color: var(--text-primary); }
.card-q { color: var(--red-bright); font-size: 13.5px; letter-spacing: 0.5px; margin-bottom: 8px; }
.card-highlight { font-size: 13px; color: var(--text-regular); margin: 0 0 12px; letter-spacing: 1px; }
.card-highlight span { display: inline-block; color: var(--red); background: var(--light-red); border: 1px solid var(--line-blue); border-radius: 999px; padding: 3px 12px; margin-right: 8px; font-weight: 600; letter-spacing: 1px; }
.card-a { color: var(--text-regular); font-size: 14px; line-height: 1.65; letter-spacing: 0.3px; margin-bottom: 12px; }
.badge-listed { display: inline-block; vertical-align: middle; margin-left: 8px; font-family: var(--sans); font-weight: 600; font-size: 11px; letter-spacing: 1px; color: #FFFFFF; background: linear-gradient(135deg, var(--red-bright), var(--red)); border: 1px solid transparent; box-shadow: 0 2px 10px rgba(22,93,255,0.30); padding: 3px 9px; border-radius: 999px; transform: translateY(-2px); }
.trust { color: var(--red-bright); font-size: 13px; letter-spacing: 1px; margin-bottom: 14px; }
.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 7px; }
.tags li { font-size: 12px; letter-spacing: 0.8px; color: var(--text-regular); padding: 3px 11px; border: 1px solid var(--line); border-radius: 999px; transition: 0.3s; }
.card:hover .tags li { border-color: var(--line-blue); color: var(--text-primary); }

/* ===== 关于 ===== */
/* 产品面板底部自然过渡到深色服务区 */
#services { background: var(--bg-deep); border-top: 1px solid rgba(22,93,255,0.08); }
.about-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: start; }
.about-para p { color: var(--ink-soft); font-size: 16px; letter-spacing: 0.4px; margin-bottom: 16px; }
.about-para p:first-child { color: var(--ink); font-family: var(--serif); font-size: 19px; }
.about-meta { display: flex; flex-direction: column; gap: 14px; }
.stat { border: 1px solid var(--line); border-radius: 16px; padding: 20px 24px; background: var(--card); display: flex; flex-direction: column; gap: 6px; box-shadow: var(--shadow); }
.stat-num { font-family: var(--serif); font-weight: 700; font-size: 22px; color: var(--text-primary); letter-spacing: 2px; }
.stat-num.red { color: var(--red-bright); }
.stat-l { font-size: 13.5px; color: var(--text-regular); letter-spacing: 1px; }

/* 模块背景节奏：白 / 极浅蓝 / 白 / 极浅蓝微染 / 白 */
#about { background: var(--bg-panel); border-top-color: var(--line); }
#brand { background: var(--bg-deep); border-top-color: var(--line-blue); }
#contact { background: var(--bg-panel); border-top-color: var(--line); }

/* ===== 品牌 ===== */
.brand-panel {
  background: linear-gradient(160deg, #FFFFFF, #F2F7FF); border: 1px solid var(--border);
  border-radius: 22px; padding: clamp(30px, 5vw, 52px); box-shadow: var(--shadow);
}
.brand-para { font-family: var(--serif); font-size: 17.5px; letter-spacing: 0.5px; color: var(--ink-soft); max-width: 840px; line-height: 2; }
.brand-para + .brand-para { margin-top: 18px; }
.brand-actions { display: flex; gap: 16px; margin-top: 30px; flex-wrap: wrap; }

/* ===== 联系 ===== */
.contact-list { border-top: 1px solid var(--line); }
.c-row {
  display: grid; grid-template-columns: 110px 1fr 120px; align-items: center; gap: 20px;
  padding: 28px 0; border-bottom: 1px solid var(--line); transition: padding-left 0.4s var(--ease);
}
.c-row:hover { padding-left: 14px; }
.c-key { font-size: 12px; letter-spacing: 3px; color: var(--red-bright); }
.c-val { font-family: var(--serif); font-size: clamp(16px, 2.1vw, 20px); letter-spacing: 1px; color: var(--text-primary); }
.c-hint { font-size: 13px; letter-spacing: 1px; color: var(--text-secondary); justify-self: end; }
.copy { font-size: 12.5px; letter-spacing: 1px; color: var(--red-bright); border: 1px solid rgba(64,128,255,0.40); padding: 7px 18px; border-radius: 999px; justify-self: end; transition: 0.35s; }
.copy:hover { background: var(--red); color: #FFFFFF; border-color: var(--red); }
.contact-cta {
  margin-top: 44px; padding: 40px; border-radius: 20px; text-align: center;
  background: linear-gradient(135deg, var(--red-bright), var(--red));
  color: #FFFFFF; box-shadow: var(--shadow-strong); display: flex; flex-direction: column; align-items: center; gap: 22px;
}
.cc-line { font-family: var(--serif); font-size: clamp(20px, 3vw, 28px); letter-spacing: 2px; }
.contact-cta .btn-solid { background: #FFFFFF; color: var(--red); box-shadow: 0 12px 30px rgba(46,111,242,0.20); }
.contact-cta .btn-solid:hover { background: var(--light-red); color: var(--red); transform: translateY(-3px); }

/* ===== 页脚 ===== */
.site-footer { border-top: 1px solid var(--line); padding: 52px 0 40px; text-align: center; background: var(--bg-deep); }
.foot-seal { width: 50px; height: 50px; margin: 0 auto 14px; opacity: 0.92; mix-blend-mode: multiply; filter: hue-rotate(200deg) saturate(1.15); }
.foot-name { font-family: var(--serif); letter-spacing: 5px; color: var(--text-primary); }
.foot-line { color: var(--text-regular); font-size: 13.5px; letter-spacing: 2px; margin-top: 8px; }
.foot-links { margin-top: 20px; font-size: 13px; color: var(--text-regular); display: flex; justify-content: center; gap: 12px; letter-spacing: 2px; }
.foot-links a { color: var(--red-bright); transition: color 0.3s; }
.foot-links a:hover { color: var(--red-deep); }

/* ===== Toast ===== */
.toast {
  position: fixed; left: 50%; bottom: 40px; transform: translate(-50%, 20px);
  background: var(--deep-red); color: #FFFFFF; padding: 12px 28px; border-radius: 999px;
  font-size: 14px; letter-spacing: 1px; opacity: 0; pointer-events: none;
  box-shadow: var(--shadow-strong); transition: 0.45s var(--ease); z-index: 200; border: 1px solid rgba(255,255,255,0.15);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ===== 动画 ===== */
@keyframes fadeUp { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: translateY(0); } }
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ===== 响应式 ===== */
@media (max-width: 1023px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .card { padding: 18px 16px; border-radius: 12px; }
  .card h3 { font-size: 17px; letter-spacing: 0.6px; }
  .card-q { font-size: 12.5px; }
  .card-a { font-size: 13px; line-height: 1.6; }
  .about-grid { grid-template-columns: 1fr; }
  .nav-links {
    position: fixed; top: 0; right: 0; height: 100vh; width: min(300px, 80vw);
    flex-direction: column; justify-content: center; gap: 30px; background: var(--white);
    transform: translateX(100%); transition: transform 0.5s var(--ease);
    box-shadow: -20px 0 60px rgba(48,49,51,0.15); border-left: 1px solid var(--border);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-toggle { display: flex; z-index: 110; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .c-row { grid-template-columns: 1fr; gap: 8px; }
  .c-hint, .copy { justify-self: start; }
}

/* ===== 平板（768–1023）：首屏单列、文案优先，照片在后 ===== */
@media (max-width: 1023px) {
  .hero-grid { display: flex; flex-direction: column; gap: 0; align-items: stretch; }
  .hero-copy { order: 1; width: 100%; }
  .hero-photo { order: 2; width: 100%; margin-top: 40px; }
  .hero-meta { order: 3; width: 100%; margin-top: 28px; }
  .photo-frame { width: 100%; }
  .hero-meta { max-width: 100%; }
}

/* ===== 产品与技术（悬浮白色内容面板，浅蓝层次） ===== */
.tech {
  position: relative; z-index: 2;
  margin-top: -48px;
  padding: clamp(68px, 9.5vw, 104px) 0 clamp(90px, 11vw, 150px);
  border-radius: 36px 36px 0 0;
  border-top: 1px solid var(--border);
  box-shadow: 0 -18px 48px rgba(40, 80, 160, 0.10), 0 -2px 10px rgba(40, 80, 160, 0.05);
  background:
    radial-gradient(circle at 82% 12%, rgba(46,111,242,0.05), transparent 38%),
    radial-gradient(circle at 12% 88%, rgba(77,139,255,0.045), transparent 40%),
    linear-gradient(180deg, #FFFFFF 0%, #FBFCFF 72%, #F6F9FE 100%);
  color: var(--ink);
  text-align: center;
  overflow: hidden;
}
.tech .eyebrow { color: var(--red); }
.tech-title {
  font-family: var(--serif);
  font-size: clamp(28px, 4.4vw, 48px);
  letter-spacing: .02em;
  margin: .4em 0;
  color: var(--text-primary);
  position: relative;
}
.tech-title::after {
  content: ""; display: block; width: 42px; height: 2px; margin: 26px auto 0;
  background: linear-gradient(90deg, var(--red-bright), var(--red)); border-radius: 2px;
}
.tech-sub { color: var(--text-regular); max-width: 660px; margin: 0 auto 3em; }
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}
.tech-item {
  background: #FFFFFF;
  padding: 22px;
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 18px;
  text-align: left;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.tech-item:hover { transform: translateY(-4px); border-color: var(--line-blue); box-shadow: var(--shadow-strong); }
.tech-item .timg {
  aspect-ratio: 16 / 10;
  border-radius: 13px;
  overflow: hidden;
  background: var(--light-gray);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
}
.tech-item .timg img { width: 100%; height: 100%; object-fit: contain; transition: transform .6s var(--ease); }
.tech-item:hover .timg img { transform: scale(1.015); }
.tech-item .tinfo { display: flex; flex-direction: column; gap: .3em; }
.tech-item .ti { color: var(--red); font-family: var(--serif); font-size: 13px; letter-spacing: .22em; font-weight: 600; }
.tech-item strong { font-family: var(--serif); font-size: 19px; color: var(--text-primary); font-weight: 600; }
.tech-item span { color: var(--text-regular); font-size: 13.5px; line-height: 1.6; }

.cert-link {
  margin-top: .9em;
  color: var(--red);
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  text-decoration: none;
  display: inline-flex; align-items: center; gap: .4em;
  border-bottom: 1px solid currentColor;
  padding-bottom: .15em;
  width: fit-content;
  transition: color .4s var(--ease);
}
.cert-link:hover { color: var(--red-deep); }

.contact-qr {
  margin: 2.6em auto 0;
  max-width: 720px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
}
.qr-card {
  background: #FFFFFF;
  border: 1px solid var(--border);
  padding: 14px;
  border-radius: 16px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform .45s var(--ease), box-shadow .45s var(--ease);
}
.qr-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-strong); border-color: var(--line-blue); }
.qr-card img {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
  border-radius: 10px;
  display: block;
  background: #FFFFFF;
}
.qr-label {
  display: block;
  margin-top: .7em;
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: .12em;
  color: #4A4A4A;
}

/* ===== AI培训 · GEO线下实训 ===== */
/* 轮播图已移除 */

/* ===== 备案资质突出 ===== */
.cert {
  margin-top: 28px; display: inline-flex; align-items: center; gap: 12px;
  padding: 14px 20px; max-width: 100%;
  background: linear-gradient(135deg, var(--light-red), rgba(22,93,255,0.04));
  border: 1px solid var(--line-blue); border-radius: 14px;
  box-shadow: var(--shadow);
  font-size: 14.5px; color: var(--text-regular); line-height: 1.5;
}
.cert-ic {
  width: 30px; height: 30px; border-radius: 50%; flex: none;
  background: linear-gradient(140deg, var(--red-bright), var(--red));
  color: #FFFFFF; display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700;
}
.cert strong { color: var(--red-bright); font-family: var(--serif); }

/* ============================================================
   移动端专项优化（仅作用于手机竖屏，不影响 PC）
   ============================================================ */

/* ===== 大屏手机 430–767 ===== */
@media (max-width: 767px) {
  .container { width: calc(100% - 40px); max-width: 560px; }

  /* 首屏：自适应高度，文案优先 */
  .hero { padding: 104px 0 60px; }
  .hero-grid { gap: 0; }
  .hero-copy .eyebrow { font-size: 12px; letter-spacing: 2.5px; line-height: 1.6; }
  .hero-title {
    font-size: clamp(36px, 9.2vw, 40px); line-height: 1.15; margin: 16px 0 18px; letter-spacing: 0.01em;
    text-shadow: 0 8px 24px rgba(0,0,20,0.45);
  }
  .hero-tags { font-size: 13px; letter-spacing: 1.2px; line-height: 1.7; }
  .hero-desc { font-size: 15px; line-height: 1.7; margin-top: 14px; max-width: 100%; }
  .hero-actions { display: flex; gap: 12px; margin-top: 28px; }
  .hero-actions .btn { flex: 1 1 0; min-width: 0; height: 46px; padding: 0 16px; font-size: 15px; letter-spacing: 1.5px; }

  /* 照片：核心文案之后，宽满，高 320–360，不裁头 */
  .hero-photo { margin-top: 44px; }
  .photo-frame { width: 100%; aspect-ratio: auto; height: clamp(320px, 84vw, 360px); border-radius: 18px; }
  .photo-frame img { object-fit: cover; object-position: center 22%; }

  /* 资料 */
  .hero-meta { width: 100%; margin-top: 28px; padding-top: 18px; gap: 12px; }
  .hm { gap: 10px; }
  .hm-k { font-size: 12px; letter-spacing: 1.5px; flex: none; width: 38px; }
  .hm-v { font-size: 14px; letter-spacing: 0.3px; line-height: 1.6; text-align: right; }

  /* 悬浮面板覆盖量与圆角 */
  .tech { margin-top: -32px; border-radius: 28px 28px 0 0; }

  /* 通用标题比例 */
  .section { padding: 68px 0; }
  .sec-head { margin-bottom: 32px; }
  .eyebrow { font-size: 11px; letter-spacing: 2.5px; line-height: 1.6; }
  .sec-title { font-size: clamp(26px, 7vw, 30px); line-height: 1.25; margin: 10px 0 12px; }
  .sec-desc { font-size: 15px; line-height: 1.7; }

  /* 技术区标题 */
  .tech { padding: clamp(64px, 9vw, 72px) 0 clamp(72px, 10vw, 90px); }
  .tech-title { font-size: clamp(26px, 7vw, 30px); line-height: 1.25; }
  .tech-title::after { margin-top: 18px; }

  /* 产品卡片单列紧凑 */
  .tech-grid { grid-template-columns: 1fr; gap: 18px; }
  .tech-item { padding: 18px; gap: 16px; border-radius: 16px; }
  .tech-item .timg { border-radius: 12px; }
  .tech-item strong { font-size: 21px; }
  .tech-item span { font-size: 14px; line-height: 1.65; }

  /* 服务卡片：两列同排，紧凑不溢出 */
  .card-grid { gap: 10px; }
  .card { padding: 15px 13px; border-radius: 12px; }
  .card h3 { font-size: 15.5px; line-height: 1.35; letter-spacing: 0.3px; margin: 5px 0 7px; }
  .card-q { font-size: 12px; line-height: 1.4; margin-bottom: 6px; }
  .card-a { font-size: 12.5px; line-height: 1.6; margin-bottom: 9px; }
  .card-highlight span { margin-bottom: 6px; }
  .tags { gap: 6px; }
  .tags li { font-size: 11px; padding: 3px 9px; letter-spacing: 0.3px; }
  .badge-listed { display: block; margin: 0 0 6px; width: fit-content; }

  /* 关于 */
  .about-grid { gap: 28px; }
  .about-para p { font-size: 15px; line-height: 1.75; }
  .stat { padding: 18px 20px; gap: 4px; }
  .stat-num { font-size: 20px; letter-spacing: 1px; }
  .stat-l { font-size: 13.5px; line-height: 1.6; }

  /* 品牌 */
  .brand-panel { padding: 26px 22px; border-radius: 18px; }
  .brand-para { font-size: 15px; line-height: 1.85; }
  .brand-actions .btn { flex: 1 1 100%; }

  /* 联系 */
  .c-row { padding: 20px 0; gap: 6px; }
  .c-key { font-size: 11px; letter-spacing: 2px; }
  .c-val { font-size: 17px; line-height: 1.6; word-break: break-word; }
  .c-hint { font-size: 12px; }
  .copy { padding: 6px 16px; font-size: 12px; }
  .contact-qr { grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 2em; }
  .qr-card { padding: 10px; border-radius: 14px; }
  .qr-card img { border-radius: 8px; }
  .qr-label { font-size: 12px; letter-spacing: 0.05em; }
  .contact-cta { margin-top: 32px; padding: 28px 22px; border-radius: 18px; gap: 16px; }
  .contact-cta .cc-line { font-size: 15px; line-height: 1.7; }
  .contact-cta .btn-solid { width: 100%; height: 48px; }

  /* 页脚 */
  .site-footer { padding: 40px 0; }
}

/* ===== 主流手机 375–429：两行按钮并排，QR 保持一行三个 ===== */
@media (max-width: 429px) {
  .container { width: calc(100% - 40px); }
  .hero-title { font-size: 37px; line-height: 1.16; }
  .contact-qr { grid-template-columns: repeat(3, 1fr); gap: 10px; }
}

/* ===== 小屏手机 320–374：收紧边距，按钮仍并排 ===== */
@media (max-width: 374px) {
  .container { width: calc(100% - 32px); }
  .hero { padding: 96px 0 56px; }
  .hero-title { font-size: 33px; line-height: 1.16; }
  .hero-desc { font-size: 14.5px; }
  .hero-actions { gap: 10px; }
  .hero-actions .btn { font-size: 14px; padding: 0 10px; letter-spacing: 1px; }
  .photo-frame { height: 320px; }
  .sec-title, .tech-title { font-size: 25px; }
  .card-grid { gap: 8px; }
  .card { padding: 12px 11px; }
  .tech-item { padding: 18px 16px; }
  .card h3 { font-size: 14.5px; }
  .card-a { font-size: 12px; }
  .tags li { font-size: 10.5px; padding: 2px 8px; }
  .contact-qr { gap: 8px; }
  .qr-card { padding: 8px; }
  .qr-label { font-size: 11px; }
  .c-val { font-size: 16px; }
}