/* ============================================
   创智天邦 - 主样式 (style.css)
   基于参考图 1:1 复刻：白底 / 红主色 / 克制专业风
============================================ */
:root {
  --color-primary: #C6271C;          /* 品牌主红（采样自参考图） */
  --color-primary-dark: #9F0B25;
  --color-primary-light: #FCEFEF;
  --color-text: #111111;
  --color-text-2: #5A5A5A;
  --color-text-3: #9A9A9A;
  --color-line: #E8E8E8;
  --color-line-2: #F3F3F3;
  --color-bg: #FFFFFF;
  --color-bg-2: #F6F6F6;
  --color-bg-3: #EFEFEF;
  /* 参考图色板（采样自截图） */
  --color-pink-business: #F6F1F2;    /* 核心业务 / AI 赋能区背景 */
  --color-pink-contact:  #F2E7E7;    /* 联系我们背景 */
  --color-footer:       #101010;    /* 页脚背景 */
  --color-case-cover-1: #3a5667;
  --color-case-cover-2: #243a48;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --shadow:    0 4px 16px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 40px rgba(0,0,0,.08);
  --radius: 0px;                     /* 全站直角，对齐参考图 */
  --container: 1200px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s; }
a:hover { color: var(--color-primary); }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* ---------- 通用 ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-tight { padding: 48px 0; }
/* 小标题 eyebrow：参考图风格 — 红色细体短文本，前置短横线 */
.eyebrow {
  display: inline-block;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1px;
  margin-bottom: 14px;
  position: relative;
  padding-left: 24px;
}
.eyebrow::before {
  content: "";
  position: absolute; left: 0; top: 50%;
  width: 16px; height: 2px;
  background: var(--color-primary);
  transform: translateY(-50%);
}
.section-title {
  font-size: 34px;
  line-height: 1.3;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.section-sub {
  color: var(--color-text-2);
  font-size: 16px;
  max-width: 720px;
  line-height: 1.7;
}

/* 区块头部：左侧 eyebrow+title，右侧 link-button（参考图所有区块通用） */
.section-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  margin-bottom: 48px;
  gap: 24px;
}
.section-head .head-left { max-width: 720px; }
.section-head .head-right { flex-shrink: 0; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 0;
  font-size: 15px; font-weight: 500;
  transition: all .25s;
  border: 1px solid var(--color-primary);
}
.btn:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); color: #fff; transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--color-primary); }
.btn-outline:hover { background: var(--color-primary); color: #fff; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--color-text); }
.btn-ghost:hover { background: var(--color-bg-3); color: var(--color-text); }
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-block { width: 100%; }

/* 文字+红圈箭头（参考图"了解更多""查看全部案例"统一风格） */
.link-more {
  display: inline-flex; align-items: center; gap: 12px;
  color: var(--color-text);
  font-size: 14px; font-weight: 500;
  transition: gap .25s, color .25s;
}
.link-more .ring {
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: 50%;
  font-size: 14px; line-height: 1;
  transition: all .25s;
}
.link-more:hover { color: var(--color-primary); gap: 14px; }
.link-more:hover .ring { background: var(--color-primary); color: #fff; }

/* ---------- HEADER（参考图：白底一行，左 logo + 中菜单 + 右侧红按钮，无下边线） ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;   /* 参考图无下边线，仅极淡的视觉分割 */
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px;
  gap: 24px;
}
/* logo：红色方块 + 品牌名 */
.logo {
  display: flex; align-items: center; gap: 12px;
  color: var(--color-text);
}
.logo-mark {
  width: 40px; height: 40px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 900; font-size: 22px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 0;
  letter-spacing: -1px;
  line-height: 1;
}
.logo-text { line-height: 1.05; }
.logo-text .cn { font-size: 18px; font-weight: 700; color: var(--color-text); letter-spacing: .5px; }
.logo-text .en { display: block; font-size: 10.5px; color: var(--color-text-3); letter-spacing: 1.5px; margin-top: 3px; font-weight: 500; }

/* 主菜单 */
.nav-list { display: flex; gap: 6px; list-style: none; }
.nav-list a {
  display: inline-block; padding: 10px 18px;
  font-size: 15px; font-weight: 500;
  color: var(--color-text);
  border-radius: 0;
  position: relative;
  transition: color .2s;
}
.nav-list a::after {
  content: ""; position: absolute; left: 18px; right: 18px; bottom: 6px;
  height: 2px; background: var(--color-primary);
  transform: scaleX(0); transform-origin: left;
  transition: transform .25s;
}
.nav-list a:hover { color: var(--color-primary); }
.nav-list a:hover::after,
.nav-list a.active::after { transform: scaleX(1); }
.nav-list a.active { color: var(--color-primary); }

.header-cta { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.hamburger { display: none; }

@media (max-width: 1024px) {
  .nav-list { display: none; }
  .hamburger {
    display: flex; align-items: center; justify-content: center;
    width: 40px; height: 40px;
    border-radius: 0;
    background: var(--color-bg-3);
  }
  .hamburger span {
    display: block; width: 20px; height: 2px; background: var(--color-text);
    position: relative;
  }
  .hamburger span::before, .hamburger span::after {
    content: ""; position: absolute; left: 0;
    width: 20px; height: 2px; background: var(--color-text);
  }
  .hamburger span::before { top: -6px; }
  .hamburger span::after { top: 6px; }
}

/* ---------- HERO：限定宽度大图 + 文字浮层（与本地预览一致） ---------- */
.hero {
  position: relative;
  background: var(--color-bg);
  padding: 56px 0;
  overflow: hidden;
}
.hero-figure {
  position: relative;
  width: 100%;
  aspect-ratio: 1200 / 520;
  background: linear-gradient(180deg, #eef3f8 0%, #dbe4ee 100%);
  overflow: hidden;
  border-radius: 0;
}
.hero-figure-svg,
.hero-figure-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block; object-fit: cover;
}
.hero-figure-img { z-index: 1; }
.hero-figure-svg { z-index: 0; }
/* 文字浮层：绝对定位覆盖整图，置于顶层（参考图：深色字浮于浅底大图之上） */
.hero-overlay {
  position: absolute; inset: 0;
  z-index: 2;
  display: flex; flex-direction: column; justify-content: center;
  align-items: flex-start;
  padding: 0 64px;
  max-width: 58%;          /* 文字占据左侧，雪山图在右侧 */
  background: linear-gradient(90deg, rgba(252,251,252,.92) 0%, rgba(252,251,252,.78) 55%, rgba(252,251,252,0) 100%);
}
.hero h1 {
  font-size: 56px; line-height: 1.12;
  font-weight: 800;
  color: var(--color-text);            /* 近黑 #111111 */
  margin-bottom: 18px;
  letter-spacing: -1px;
}
.hero h1 .hl { color: var(--color-primary); }   /* 强调副标题用品牌红 */
.hero-desc {
  font-size: 17px; color: var(--color-text-2);
  line-height: 1.8; margin-bottom: 32px;
  max-width: 520px;
}
.hero-actions { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.hero-cta-group { display: inline-flex; align-items: center; gap: 10px; color: var(--color-text); font-size: 14px; font-weight: 600; }
.hero-cta-group .arrow-circle {
  width: 22px; height: 22px; border-radius: 0;
  background: var(--color-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px;
}
.hero-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }
.hero-tags .pill {
  background: rgba(198,39,28,.06);
  border: 1px solid rgba(198,39,28,.25);
  padding: 7px 16px;
  font-size: 12px; color: var(--color-primary);
}
.hero-banner-tip {
  position: absolute; right: 16px; bottom: 16px;
  z-index: 3;
  background: rgba(17,17,17,.55); color: #fff;
  font-size: 12px; padding: 6px 12px;
}

@media (max-width: 900px) {
  .hero { padding: 32px 0; }
  .hero-figure { aspect-ratio: 1200 / 640; }
  .hero-overlay { padding: 0 24px; max-width: 100%;
    background: linear-gradient(180deg, rgba(252,251,252,.95) 0%, rgba(252,251,252,.6) 100%); }
  .hero h1 { font-size: 32px; }
}
/* 合作机构 Logo 墙（参考图：上方小字 + 6 个真实品牌灰度 logo + 圆点指示器） */
.logo-strip {
  background: #fff;
  padding: 48px 0 56px;
  border-bottom: 1px solid var(--color-line-2);
}
.logo-strip-label {
  font-size: 12px; color: var(--color-text-3); letter-spacing: 1px;
  margin-bottom: 28px;
}
.logo-strip-grid {
  display: grid; grid-template-columns: repeat(6, 1fr);
  gap: 0; align-items: center;
}
.logo-strip-item {
  display: flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 4px 8px;
  color: #6B7280;
  filter: grayscale(100%);
  opacity: .75;
  font-size: 16px; font-weight: 600; letter-spacing: 0;
  transition: opacity .2s, filter .2s;
}
.logo-strip-item:hover { opacity: 1; filter: grayscale(60%); }
.logo-strip-item .brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px;
  color: inherit;
}
.logo-strip-item .brand-mark svg { width: 100%; height: 100%; }
.logo-strip-item .brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-strip-item .brand-text .zh { font-size: 14px; font-weight: 700; color: inherit; }
.logo-strip-item .brand-text .en { font-size: 9px; color: inherit; letter-spacing: 1px; opacity: .7; margin-top: 1px; }

@media (max-width: 1024px) { .logo-strip-grid { grid-template-columns: repeat(3, 1fr); gap: 20px 12px; } }
@media (max-width: 600px)  { .logo-strip-grid { grid-template-columns: repeat(2, 1fr); } }

/* 核心业务区（参考图：白底 + 头部 [eyebrow+标题 / 红圈"了解更多"] + 4 张白卡 + 红色方块图标） */
.business-section { padding: 90px 0 80px; background: #fff; }
.business-section .section-title { line-height: 1.3; }
.business-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 56px;
}
.business-card {
  background: #fff;
  border: 1px solid var(--color-line-2);
  border-radius: 0;
  padding: 36px 28px 30px;
  transition: all .25s;
  position: relative;
  display: flex; flex-direction: column;
}
.business-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 8px 28px rgba(198,39,28,.08);
  transform: translateY(-3px);
}
/* 实心红色方块图标（参考图风格） */
.b-icon {
  width: 48px; height: 48px;
  border-radius: 0;
  background: var(--color-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 22px;
  flex-shrink: 0;
}
.b-icon svg { width: 24px; height: 24px; stroke: #fff; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.b-title { font-size: 18px; font-weight: 700; margin-bottom: 12px; color: var(--color-text); letter-spacing: 0; }
.b-desc { color: var(--color-text-2); font-size: 13.5px; line-height: 1.8; margin-bottom: 24px; min-height: 72px; }
.b-arrow {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--color-text); font-size: 13px; font-weight: 500;
  margin-top: auto;
  transition: color .2s, gap .2s;
}
.b-arrow:hover { color: var(--color-primary); gap: 10px; }

@media (max-width: 1024px) { .business-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px)  { .business-grid { grid-template-columns: 1fr; } }

/* AI 赋能区（参考图 1:1：浅粉→白渐变背景 + 左大文 + 右 2×2 网格 + 中心红色 AI 装饰） */
.ai-section {
  background: linear-gradient(180deg, var(--color-pink-business) 0%, #F7EFF1 60%, #F9F4F5 100%);
  padding: 90px 0 100px;
}
.ai-inner {
  display: flex; flex-direction: row;
  align-items: center;
  gap: 80px;
}
.ai-left { flex: 0 0 320px; align-self: stretch; display: flex; flex-direction: column; justify-content: flex-end; }
.ai-right { flex: 1; }
.ai-left .eyebrow { color: var(--color-primary); }
.ai-left h2 {
  font-size: 36px; line-height: 1.25; font-weight: 800;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
  color: var(--color-text);
}
.ai-left p { color: var(--color-text-2); line-height: 1.85; margin-bottom: 32px; font-size: 14.5px; max-width: 720px; }
.ai-right {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 56px 80px;
  position: relative;
}
/* 中心 AI 装饰（参考图：浅粉半透明圆 + 红色 AI 立体字） */
.ai-center {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  pointer-events: none;
}
.ai-center .halo {
  width: 130px; height: 130px;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(220,140,150,.22) 0%, rgba(220,140,150,.10) 55%, transparent 100%);
  display: flex; align-items: center; justify-content: center;
  position: relative;
  box-shadow: 0 0 40px 10px rgba(220,140,150,.10);
}
.ai-center .halo::before,
.ai-center .halo::after {
  content: ""; position: absolute; inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(198,39,28,.18);
}
.ai-center .halo::before { transform: rotate(15deg) scaleY(.40); }
.ai-center .halo::after  { transform: rotate(-22deg) scaleY(.34); }
.ai-center .label {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 32px; font-weight: 900; color: var(--color-primary);
  letter-spacing: -1px;
  text-shadow: 0 2px 8px rgba(198,39,28,.25);
  font-style: italic;
}
/* 单个能力卡（参考图 1:1：透明/无独立背景，浅粉圆角方块图标+红色 svg，深色文字） */
.ai-card {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 8px 0 8px;
  transition: all .25s;
  position: relative; z-index: 2;
  display: flex; flex-direction: column;
  gap: 10px;
}
.ai-card:hover { transform: translateY(-3px); }
.ai-card-head { display: flex; align-items: center; gap: 14px; margin-bottom: 4px; }
.ai-card-head .dot {
  width: 42px; height: 42px;
  background: rgba(255,255,255,.85);
  border: 1px solid rgba(198,39,28,.10);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(198,39,28,.06);
}
.ai-card-head .dot svg { width: 22px; height: 22px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.ai-card-title { font-size: 18px; font-weight: 700; color: var(--color-text); letter-spacing: 0; line-height: 1.4; }
.ai-card-desc { color: var(--color-text-2); font-size: 13.5px; line-height: 1.85; margin-top: 2px; }

@media (max-width: 1024px) {
  .ai-inner { gap: 36px; }
  .ai-right { grid-template-columns: repeat(2, 1fr); gap: 40px 32px; }
  .ai-center { display: none; }
}
@media (max-width: 560px) {
  .ai-right { grid-template-columns: 1fr; gap: 32px; }
  .ai-center { display: none; }
}

/* 标杆案例区（参考图：白底 + 左 eyebrow+标题 / 右"查看全部案例"红圈箭头 + 3 张深色封面卡） */
.cases-section { padding: 100px 0 80px; background: #fff; }
.cases-section .section-head { margin-bottom: 48px; }
.cases-section .section-head .head-left { max-width: 720px; }
.cases-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  position: relative;
  border-radius: 0;
  overflow: hidden;
  aspect-ratio: 4/3;
  color: #fff;
  display: block;
  background: #2c4250;
  border: none;
  transition: transform .3s, box-shadow .3s;
}
.case-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,.18); }
.case-cover {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(20,32,42,.0) 0%, rgba(20,32,42,.55) 65%, rgba(20,32,42,.92) 100%),
    linear-gradient(135deg, #3a5667 0%, #243a48 100%);
  display: flex; align-items: center;
  padding: 28px 28px 24px;
}
/* 城市建筑剪影（CSS only，呼应参考图深色封面的高楼意象） */
.case-cover::before {
  content: "";
  position: absolute; left: 0; right: 0; top: 38%;
  height: 48%;
  background:
    linear-gradient(90deg, transparent 0 8%, rgba(255,255,255,.04) 8% 12%, transparent 12% 25%, rgba(255,255,255,.05) 25% 30%, transparent 30% 50%, rgba(255,255,255,.04) 50% 56%, transparent 56% 72%, rgba(255,255,255,.05) 72% 78%, transparent 78% 100%),
    linear-gradient(180deg, transparent 0 30%, rgba(0,0,0,.32) 100%);
  pointer-events: none;
}
.case-body {
  position: relative; z-index: 1;
  width: 100%;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  text-align: center;
}
.case-cat { font-size: 11.5px; color: rgba(255,255,255,.78); letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 4px; text-align: center; }
.case-title { font-size: 20px; line-height: 1.4; font-weight: 700; color: #fff; margin-bottom: 8px; letter-spacing: -.3px; text-align: center; }
.case-desc { font-size: 12.5px; color: rgba(255,255,255,.65); line-height: 1.65; margin-bottom: 14px; text-align: center; }
.case-cta { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; color: #fff; font-weight: 500; opacity: .9; }

/* 引言条（参考图 1:1：通栏白卡、左侧红色竖边、内容左对齐、左上角大引号、底部署名带红竖线） */
.testimonial {
  margin: 72px 0 0;
  background: #fff;
  border: 1px solid var(--color-line-2);
  border-left: 6px solid var(--color-primary);
  padding: 56px 64px 48px;
  position: relative;
  text-align: left;
}
/* 左上角大引号 */
.testimonial::before {
  content: "\201C";
  position: absolute;
  top: 14px; left: 56px;
  font-size: 64px; line-height: 1;
  color: var(--color-line);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
}
.testimonial .quote {
  font-size: 15px; color: var(--color-text-2);
  line-height: 2.0; max-width: 880px; margin: 36px 0 0;
  text-align: left;
}
.testimonial .author {
  margin-top: 22px; font-size: 13px; color: var(--color-text-3);
  text-align: left;
  display: inline-flex; align-items: center; gap: 10px;
  position: relative;
}
.testimonial .author::before {
  content: "";
  width: 2px; height: 13px;
  background: var(--color-primary);
  display: inline-block;
}

@media (max-width: 1024px) { .cases-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 768px)  { .cases-grid { grid-template-columns: 1fr; } .testimonial { padding: 64px 24px 48px; } }

/* ---------- CONTACT 联系我们（参考图：粉红底 + 左侧大字 + 红色方块图标行 + 右侧表单） ---------- */
.contact-section { padding: 80px 0 100px; background: #fff; }
.contact-inner {
  display: grid; grid-template-columns: 1fr 1.25fr;
  gap: 80px; align-items: start;
}
.contact-left h2 { font-size: 34px; margin-bottom: 16px; line-height: 1.3; font-weight: 800; color: var(--color-text); letter-spacing: -0.5px; }
.contact-left .desc { color: var(--color-text-2); line-height: 1.85; margin-bottom: 36px; font-size: 14.5px; }
.contact-info { display: flex; flex-direction: column; gap: 22px; }
.contact-info-item { display: flex; align-items: flex-start; gap: 16px; }
.contact-info-item .ic {
  width: 40px; height: 40px; flex-shrink: 0;
  border-radius: 0; background: var(--color-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
}
.contact-info-item .ic svg { width: 18px; height: 18px; stroke: #fff; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.contact-info-item .meta { font-size: 12.5px; color: var(--color-text-3); margin-bottom: 2px; }
.contact-info-item .val { color: var(--color-text); font-size: 15px; font-weight: 500; }

.form-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 18px 16px;
}
.form-grid .full { grid-column: 1 / -1; }
.field label {
  display: block; font-size: 13px; color: var(--color-text-2);
  margin-bottom: 8px;
}
.field label .req { color: var(--color-primary); margin-left: 2px; }
.field input, .field textarea, .field select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-line);
  border-radius: 0;
  background: #fff;
  transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(198,39,28,.10);
}
.field textarea { resize: vertical; min-height: 110px; }
.field select {
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23111' stroke-width='2' stroke-linecap='round'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 16px 16px;
  padding-right: 40px;
}
.checkbox-row {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--color-text-2);
  grid-column: 1 / -1;
}
.checkbox-row a { color: var(--color-primary); }
.checkbox-row input[type=checkbox] {
  width: 14px; height: 14px; accent-color: var(--color-primary);
  margin: 0;
}

@media (max-width: 900px) {
  .contact-inner { grid-template-columns: 1fr; gap: 48px; }
  .form-grid { grid-template-columns: 1fr; }
}

/* ---------- FOOTER（参考图：黑底 + 4 列内容 + 1 列关注我们） ---------- */
.site-footer {
  background: var(--color-footer);
  color: #d1d5db;
  padding: 56px 0 28px;
  font-size: 13px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr 0.8fr;
  gap: 40px;
}
.footer-brand .logo {
  color: #fff; margin-bottom: 18px;
}
.footer-brand .logo .logo-text .en { color: #6b7280; }
.footer-brand p { color: #9ca3af; line-height: 1.8; margin-bottom: 18px; max-width: 320px; font-size: 12.5px; }
.footer-h {
  color: #fff; font-size: 14px; font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: 0;
}
.footer-list { list-style: none; }
.footer-list li { margin-bottom: 11px; }
.footer-list a { color: #9ca3af; transition: color .2s; font-size: 13px; }
.footer-list a:hover { color: var(--color-primary); }
.footer-bottom {
  margin-top: 44px; padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.08);
  display: flex; justify-content: space-between; align-items: center;
  color: #6b7280; font-size: 12px;
}
/* 关注我们：圆形社交按钮 */
.footer-follow { display: flex; flex-direction: column; align-items: flex-end; gap: 14px; }
.footer-social {
  display: flex; gap: 10px;
}
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,.10);
  display: flex; align-items: center; justify-content: center;
  color: #fff; transition: background .2s, transform .2s;
}
.footer-social a:hover { background: var(--color-primary); transform: translateY(-2px); }
.footer-social svg { width: 16px; height: 16px; fill: #fff; }
@media (max-width: 900px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 12px; align-items: flex-start; }
  .footer-follow { align-items: flex-start; }
}

/* ---------- BANNER (非首页) ---------- */
.page-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, #6e0817 100%);
  color: #fff;
  padding: 80px 0 70px;
  position: relative; overflow: hidden;
}
.page-banner::before {
  content: ""; position: absolute; right: -100px; top: -100px;
  width: 400px; height: 400px; border-radius: 50%;
  background: rgba(255,255,255,.06);
}
.page-banner::after {
  content: ""; position: absolute; left: -60px; bottom: -60px;
  width: 240px; height: 240px; border-radius: 50%;
  background: rgba(255,255,255,.05);
}
.page-banner h1 { font-size: 44px; font-weight: 800; margin-bottom: 16px; position: relative; }
.page-banner p { font-size: 16px; opacity: .9; line-height: 1.8; max-width: 700px; position: relative; }
.page-banner .container { position: relative; z-index: 1; }

/* 面包屑 */
.breadcrumb {
  background: var(--color-bg-2);
  padding: 12px 0; font-size: 13px; color: var(--color-text-3);
}
.breadcrumb a { color: var(--color-text-2); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { margin: 0 8px; }

/* 列表卡片 */
.list-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.list-item {
  background: #fff; border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all .3s;
}
.list-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: transparent;
}
.list-item-cover {
  aspect-ratio: 16/10;
  background: var(--color-bg-3);
  background-size: cover; background-position: center;
}
.list-item-body { padding: 22px; }
.list-item-cat {
  font-size: 12px; color: var(--color-primary);
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.list-item-title { font-size: 17px; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
.list-item-desc { font-size: 13px; color: var(--color-text-2); line-height: 1.6; }
.list-item-meta { font-size: 12px; color: var(--color-text-3); margin-top: 14px; }

@media (max-width: 900px) { .list-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .list-grid { grid-template-columns: 1fr; } }

/* 详情页 */
.detail-wrap { padding: 60px 0; }
.detail-content {
  background: #fff; border-radius: var(--radius-lg);
  padding: 50px; line-height: 1.9;
  font-size: 15px; color: var(--color-text-2);
}
.detail-content h2, .detail-content h3 { color: var(--color-text); margin: 26px 0 14px; }
.detail-content h2 { font-size: 24px; }
.detail-content h3 { font-size: 20px; }
.detail-content p { margin-bottom: 14px; }
.detail-content img { border-radius: var(--radius); margin: 16px 0; }

/* 分页 */
.pagination { display: flex; justify-content: center; gap: 6px; margin-top: 40px; flex-wrap: wrap; }
.pagination a, .pagination span {
  min-width: 36px; height: 36px; padding: 0 12px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 0;
  border: 1px solid var(--color-line);
  background: #fff;
  font-size: 14px; color: var(--color-text-2);
  transition: all .2s;
}
.pagination a:hover { border-color: var(--color-primary); color: var(--color-primary); }
.pagination .active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.pagination .disabled { opacity: .4; pointer-events: none; }

/* 留言成功提示 */
.alert-success { background: #DCFCE7; color: #166534; padding: 12px 16px; border-radius: 0; }
.alert-error   { background: #FEE2E2; color: #991B1B; padding: 12px 16px; border-radius: 0; }

/* 文字提示页 */
.empty-state { text-align: center; padding: 80px 20px; color: var(--color-text-3); }
.empty-state h3 { font-size: 24px; color: var(--color-text-2); margin: 16px 0 12px; }

/* Responsive helpers */
@media (max-width: 768px) {
  .section { padding: 50px 0; }
  .section-title { font-size: 26px; }
  .container { padding: 0 16px; }
  .page-banner { padding: 50px 0 40px; }
  .page-banner h1 { font-size: 30px; }
  .hero h1 { font-size: 32px; }
  .ai-left h2 { font-size: 26px; }
}

/* ============= 内页通用组件 ============= */
.about-section { padding: 80px 0; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-grid h2 { font-size: 32px; margin-bottom: 16px; }
.about-grid p { color: var(--color-text-2); margin-bottom: 16px; line-height: 1.8; }
.about-visual {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--color-primary) 0%, #5e0817 100%);
  border-radius: var(--radius-lg);
  position: relative; overflow: hidden;
}
.about-visual::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(255,255,255,.15) 0%, transparent 40%);
}
.about-visual .big-num {
  position: absolute; right: 30px; top: 30px;
  font-size: 90px; font-weight: 900; color: rgba(255,255,255,.18);
  letter-spacing: -4px; line-height: 1;
}
.about-visual .big-label {
  position: absolute; left: 30px; bottom: 30px;
  color: #fff; font-size: 22px; font-weight: 700;
}

.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 50px; }
.value-card {
  background: var(--color-bg-2); border-radius: var(--radius-lg);
  padding: 32px 28px;
}
.value-card .v-icon {
  width: 52px; height: 52px; border-radius: 0;
  background: var(--color-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.value-card h3 { font-size: 20px; margin-bottom: 10px; }
.value-card p { color: var(--color-text-2); font-size: 14px; line-height: 1.7; }

@media (max-width: 900px) {
  .about-grid, .values-grid { grid-template-columns: 1fr; }
}