/* ============================================================
   创特新广告 · 官网共享样式 style.css
   适配：index.html / ai-geo.html / cases.html / about.html / contact.html
   主色调：#0056A5（品牌蓝）｜ 导航栏：蓝底白字
   风格：简约商务 / 蓝白配色 / 干净大气 / 移动端自适应
   ============================================================ */
:root {
  --brand: #0056A5;          /* 品牌主色（导航底色，与 LOGO 无缝融合） */
  --brand-dark: #00427e;
  --brand-light: #e6f0fa;
  --blue: #0056A5;           /* 兼容旧引用，统一为主色 */
  --blue-dark: #00427e;
  --navy: #0c2d57;
  --blue-light: #e6f0fa;
  --blue-line: #cfe0f2;
  --text: #1f2937;
  --text-2: #4b5563;
  --text-3: #6b7280;
  --bg: #ffffff;
  --bg-soft: #f5f8fd;
  --border: #e5eaf2;
  --shadow: 0 8px 30px rgba(0, 86, 165, .08);
  --shadow-hover: 0 14px 40px rgba(0, 86, 165, .16);
  --radius: 12px;
  --maxw: 1180px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
/* ---------------- 顶部导航（蓝底白字） ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #0056A5;   /* 品牌蓝底，与 LOGO 底色一致，无缝融合 */
  border-bottom: 1px solid rgba(255, 255, 255, .14);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 16px;
}
/* 导航 LOGO：独占固定空间，绝不参与 flex 压缩 */
.brand {
  display: flex;
  align-items: center;
  flex: 0 0 auto;        /* 禁止被导航链接挤压缩小 */
  min-width: 160px;      /* 给 LOGO 预留足够宽度，不挤在导航栏里 */
}
/* 全程保持 LOGO 原始宽高比：高度固定、宽度自适应、contain 防裁切 */
.brand img {
  height: 52px;
  width: auto;            /* 宽度按原图比例自适应，不拉伸、不压扁 */
  max-width: 100%;        /* 容器极窄时整体缩放，不裁切 */
  object-fit: contain;    /* 双重保险：保持原图比例显示 */
  flex-shrink: 0;         /* 禁止被 flex 布局压缩变形 */
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;      /* 靠右对齐，与右侧 CTA 区拉开 */
}
.nav-links > a,
.nav-links .nav-item > a {
  font-size: 16px;
  color: rgba(255, 255, 255, .88);   /* 蓝底白字 */
  font-weight: 500;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}
.nav-links > a:hover,
.nav-links .nav-item > a:hover { color: #fff; }
.nav-links > a.active,
.nav-links .nav-item > a.active { color: #fff; border-bottom-color: #fff; }

/* ---------- 下拉菜单 ---------- */
.nav-item { position: relative; }
.nav-item .caret {
  font-size: 10px;
  line-height: 1;
  transition: transform .2s;
  opacity: .8;
}
.nav-item:hover .caret,
.nav-item:focus-within .caret { transform: rotate(180deg); }
.dropdown {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  min-width: 200px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 16px 40px rgba(12, 45, 87, .22);
  padding: 10px 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s, transform .2s, visibility .2s;
  z-index: 120;
}
/* 悬浮桥接区：避免鼠标移向菜单时菜单消失 */
.dropdown::before {
  content: "";
  position: absolute;
  top: -14px; left: 0; right: 0;
  height: 14px;
}
.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown a {
  display: block;
  padding: 10px 22px;
  font-size: 15px;
  color: #1f2937 !important;
  border-bottom: none !important;
  white-space: nowrap;
  transition: background .16s, color .16s, padding-left .16s;
}
.dropdown a:hover {
  background: #e6f0fa;
  color: #0056A5 !important;
  padding-left: 26px;
}
/* 下拉小三角 */
.dropdown::after {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 12px; height: 12px;
  background: #fff;
  border-radius: 2px;
}

/* ---------- 导航右侧 CTA 区 ---------- */
.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}
.nav-quote {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #FF6A00;
  color: #fff !important;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  transition: background .2s, transform .2s;
}
.nav-quote:hover { background: #e85d00; transform: translateY(-1px); }
.nav-tel {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: #0056A5 !important;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  border-bottom: none !important;
  transition: background .2s;
}
.nav-tel:hover { background: #e6f0fa; color: #0056A5 !important; }

/* ---------- 移动端吸底拨号条 ---------- */
.mobile-bar { display: none; }
.mobile-bar a {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 14px 8px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .5px;
}
.mobile-bar .mb-call { background: #FF6A00; color: #fff; }
.mobile-bar .mb-quote { background: #0056A5; color: #fff; }

.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { display: block; width: 24px; height: 2px; background: #fff; margin: 5px 0; transition: .2s; }
/* 汉堡按钮三横线动画 */
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
/* ---------------- Hero 首屏 ---------------- */
.hero {
  background:
    radial-gradient(1000px 400px at 85% -10%, rgba(0, 86, 165, .14), transparent 60%),
    radial-gradient(700px 320px at 0% 110%, rgba(0, 86, 165, .10), transparent 60%),
    linear-gradient(180deg, #eef5fc 0%, #ffffff 100%);
  padding: 96px 0 88px;
  border-bottom: 1px solid var(--border);
}
.hero .eyebrow {
  display: inline-block;
  background: var(--blue-light);
  color: var(--brand);
  border: 1px solid var(--blue-line);
  font-size: 14px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 22px;
  letter-spacing: 2px;
}
.hero h1 {
  font-size: 46px;
  line-height: 1.25;
  color: var(--navy);
  letter-spacing: 1px;
}
.hero h1 em { font-style: normal; color: var(--brand); }
.hero p.lead {
  margin-top: 20px;
  font-size: 18px;
  color: var(--text-2);
  max-width: 720px;
}
/* 首页 Banner 核心广告语（副标题，大气醒目） */
.hero-sub {
  margin-top: 16px;
  font-size: 28px;
  font-weight: 800;
  color: var(--brand);
  letter-spacing: 4px;
}
.hero-actions { margin-top: 36px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  margin-top: 52px;
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}
.hero-stats .stat b { font-size: 34px; color: var(--brand); }
.hero-stats .stat span { display: block; color: var(--text-3); font-size: 14px; margin-top: 2px; }
/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all .2s;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); transform: translateY(-1px); }
.btn-ghost { background: #fff; color: var(--brand); border-color: var(--blue-line); }
.btn-ghost:hover { border-color: var(--brand); background: var(--blue-light); }
/* ---------------- 通用 Section ---------------- */
.section { padding: 84px 0; }
.section.soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 54px; }
.section-head .kicker {
  color: var(--brand);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 3px;
}
.section-head h2 {
  font-size: 34px;
  color: var(--navy);
  margin-top: 10px;
  letter-spacing: 1px;
}
.section-head p { color: var(--text-2); margin-top: 14px; }
.section-head .head-line {
  width: 56px; height: 4px; border-radius: 2px;
  background: var(--brand); margin: 18px auto 0;
}
/* ---------------- 业务双引擎 ---------------- */
.engines { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.engine-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 38px 34px;
  box-shadow: var(--shadow);
  transition: transform .25s, box-shadow .25s;
}
.engine-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.engine-card .tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
  letter-spacing: 1px;
}
.engine-card.tradition .tag { background: var(--blue-light); color: var(--brand); }
.engine-card.ai .tag { background: #eef0ff; color: #4338ca; }
.engine-card h3 { font-size: 23px; color: var(--navy); margin-bottom: 8px; }
.engine-card .sub { color: var(--text-3); font-size: 15px; margin-bottom: 20px; }
.engine-card ul li {
  position: relative;
  padding: 9px 0 9px 26px;
  color: var(--text-2);
  border-bottom: 1px dashed var(--border);
  font-size: 15.5px;
}
.engine-card ul li:last-child { border-bottom: none; }
.engine-card ul li::before {
  content: "";
  position: absolute;
  left: 4px; top: 17px;
  width: 8px; height: 8px;
  border-radius: 2px;
  background: var(--brand);
}
.engine-card.ai ul li::before { background: #4338ca; }
/* ---------------- 核心优势 ---------------- */
.advantages { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.adv-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform .25s, box-shadow .25s;
}
.section.soft .adv-card { box-shadow: var(--shadow); }
.adv-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.adv-card .num {
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  background: var(--blue-light);
  color: var(--brand);
  font-size: 20px;
  font-weight: 800;
  border-radius: 10px;
  margin-bottom: 18px;
}
.adv-card h3 { font-size: 17.5px; color: var(--navy); margin-bottom: 10px; line-height: 1.5; }
.adv-card p { font-size: 14.5px; color: var(--text-3); }
/* ---------------- 案例页 ---------------- */
.case-group { margin-bottom: 64px; }
.case-group:last-child { margin-bottom: 0; }
.case-group-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 24px; }
.case-group-head h3 { font-size: 24px; color: var(--navy); }
.case-group-head .count { color: var(--text-3); font-size: 14px; }
.case-group-head .bar { width: 5px; height: 22px; border-radius: 3px; background: var(--brand); align-self: center; }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: zoom-in;
  transition: transform .25s, box-shadow .25s;
}
.case-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.case-thumb { position: relative; overflow: hidden; aspect-ratio: 4 / 3; background: var(--bg-soft); }
.case-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .4s;
}
.case-card:hover .case-thumb img { transform: scale(1.05); }
.case-thumb .zoom-icon {
  position: absolute;
  right: 12px; bottom: 12px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(12, 45, 87, .72);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 17px;
  opacity: 0;
  transition: opacity .25s;
}
.case-card:hover .zoom-icon { opacity: 1; }
.case-body { padding: 18px 20px 20px; }
.case-body h4 { font-size: 16.5px; color: var(--text); }
.case-body p { font-size: 13.5px; color: var(--text-3); margin-top: 5px; }
.case-chip {
  display: inline-block;
  font-size: 12px;
  color: var(--brand);
  background: var(--blue-light);
  border-radius: 4px;
  padding: 2px 10px;
  margin-bottom: 10px;
}
.case-chip.ai { color: #4338ca; background: #eef0ff; }
/* ---------------- Lightbox 图片放大 ---------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(10, 20, 40, .88);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: min(920px, 92vw);
  max-height: 82vh;
  width: auto; height: auto;
  border-radius: 8px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, .5);
}
.lightbox .lb-caption {
  position: absolute;
  bottom: 26px; left: 0; right: 0;
  text-align: center;
  color: #dbe6f7;
  font-size: 15px;
}
.lightbox .lb-close {
  position: absolute;
  top: 20px; right: 28px;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, .14);
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  transition: background .2s;
}
.lightbox .lb-close:hover { background: rgba(255, 255, 255, .3); }
/* ---------------- 关于我们 ---------------- */
.about-wrap { display: grid; grid-template-columns: 1.2fr .8fr; gap: 48px; align-items: start; }
.about-text h2 { font-size: 26px; color: var(--navy); margin-bottom: 18px; }
.about-text p { color: var(--text-2); margin-bottom: 16px; text-align: justify; }
.about-text .hl { color: var(--brand); font-weight: 600; }
/* 关于我们开篇标语 + 释义 */
.about-slogan {
  font-size: 29px;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: 2px;
  margin-bottom: 12px;
  padding-left: 16px;
  border-left: 5px solid var(--brand);
  line-height: 1.3;
}
.about-slogan-desc { color: var(--text-2); margin-bottom: 22px; }
.about-aside {
  background: linear-gradient(160deg, var(--navy), var(--brand-dark));
  border-radius: var(--radius);
  color: #fff;
  padding: 36px 32px;
}
.about-aside h3 { font-size: 19px; margin-bottom: 20px; letter-spacing: 1px; }
.about-aside li {
  display: flex; gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, .14);
  font-size: 15px;
  color: #e2ecfb;
}
.about-aside li:last-child { border-bottom: none; }
.about-aside li b { color: #9cc3ff; }
.value-list { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 56px; }
.value-card {
  display: flex;
  gap: 18px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow);
}
.value-card .vnum {
  flex: none;
  width: 44px; height: 44px;
  border-radius: 10px;
  background: var(--blue-light);
  color: var(--brand);
  font-weight: 800;
  font-size: 19px;
  display: flex; align-items: center; justify-content: center;
}
.value-card h4 { font-size: 16.5px; color: var(--navy); margin-bottom: 6px; }
.value-card p { font-size: 14px; color: var(--text-3); }
/* ---------------- 联系我们 ---------------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px; align-items: start; }
.contact-info-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 32px;
  box-shadow: var(--shadow);
}
.contact-item { display: flex; gap: 16px; padding: 16px 0; border-bottom: 1px dashed var(--border); }
.contact-item:last-child { border-bottom: none; }
.contact-item .ico {
  flex: none;
  width: 44px; height: 44px;
  border-radius: 10px;
  background: var(--blue-light);
  color: var(--brand);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
}
.contact-item h4 { font-size: 15px; color: var(--text-3); font-weight: 500; }
.contact-item p { font-size: 16.5px; color: var(--navy); font-weight: 600; margin-top: 3px; }
.contact-item p a:hover { color: var(--brand); }
.qr-block { display: flex; gap: 18px; align-items: center; padding-top: 20px; }
.qr-block img { width: 128px; height: 128px; border: 1px solid var(--border); border-radius: 8px; }
.qr-block .qr-tip h4 { font-size: 16px; color: var(--navy); margin-bottom: 6px; }
.qr-block .qr-tip p { font-size: 13.5px; color: var(--text-3); }
/* 表单 */
.form-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 32px;
  box-shadow: var(--shadow);
}
.form-card h3 { font-size: 21px; color: var(--navy); margin-bottom: 6px; }
.form-card .form-sub { font-size: 14px; color: var(--text-3); margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; color: var(--text-2); margin-bottom: 7px; font-weight: 500; }
.field label i { color: #e02e2e; font-style: normal; margin-left: 2px; }
.field input, .field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 15px;
  color: var(--text);
  background: var(--bg-soft);
  outline: none;
  transition: border-color .2s, box-shadow .2s;
  font-family: inherit;
}
.field input:focus, .field textarea:focus {
  border-color: var(--brand);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(0, 86, 165, .12);
}
.field textarea { min-height: 120px; resize: vertical; }
.field .err { display: none; color: #e02e2e; font-size: 12.5px; margin-top: 5px; }
.field.invalid input, .field.invalid textarea { border-color: #e02e2e; }
.field.invalid .err { display: block; }
.form-success {
  display: none;
  background: #eefaf1;
  border: 1px solid #bfe8cc;
  color: #1c7c3d;
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 14.5px;
  margin-top: 16px;
}
.form-success.show { display: block; }
/* 地图 */
.map-card {
  margin-top: 40px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.map-card .map-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 26px;
  border-bottom: 1px solid var(--border);
}
.map-card .map-head h3 { font-size: 17px; color: var(--navy); }
.map-card .map-head span { font-size: 13.5px; color: var(--text-3); }
.map-card img { width: 100%; height: auto; }
/* ---------------- CTA 条 ---------------- */
.cta-band {
  background: linear-gradient(120deg, var(--navy) 0%, var(--brand-dark) 55%, var(--brand) 100%);
  color: #fff;
  padding: 64px 0;
  text-align: center;
}
.cta-band h2 { font-size: 30px; letter-spacing: 1px; }
.cta-band p { color: #cfe0fa; margin: 14px 0 30px; font-size: 16px; }
.cta-band .btn { background: #fff; color: var(--brand); }
.cta-band .btn:hover { background: var(--blue-light); }
/* ---------------- 页脚 ---------------- */
.site-footer { background: var(--navy); color: #b9cbe6; padding: 60px 0 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 44px;
  padding-bottom: 44px;
}
/* 页脚 LOGO：同样保持原始比例，不拉伸、不裁切 */
.footer-brand img {
  height: 48px;
  width: auto;
  max-width: 100%;
  object-fit: contain;    /* 保持原图宽高比显示 */
  flex-shrink: 0;
  border-radius: 10px;    /* 蓝底LOGO在深蓝页脚上呈圆角品牌徽标效果 */
  margin-bottom: 18px;
}
.footer-brand p { font-size: 14px; line-height: 1.8; }
/* 页脚 LOGO 旁小字版标语（全站统一） */
.footer-slogan {
  font-size: 13px;
  font-weight: 600;
  color: #9cc3ff;
  letter-spacing: 2px;
  margin: 0 0 14px;
}
.site-footer h4 { color: #fff; font-size: 16px; margin-bottom: 18px; letter-spacing: 1px; }
.site-footer li { margin-bottom: 11px; font-size: 14.5px; }
.site-footer li a:hover { color: #fff; }
.site-footer li b { color: #dce7f7; font-weight: 600; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding: 20px 0;
  font-size: 13px;
  color: #7f96b8;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
/* ---------------- 返回顶部 ---------------- */
.back-top {
  position: fixed;
  right: 26px; bottom: 30px;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--brand);
  color: #fff;
  font-size: 19px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s, background .2s;
  z-index: 90;
  box-shadow: var(--shadow-hover);
}
/* 移动端：返回顶部上移，避免被吸底拨号条遮挡 */
@media (max-width: 640px) {
  .back-top { right: 16px; bottom: 72px; width: 42px; height: 42px; }
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { background: var(--brand-dark); }
/* ---------------- 首页：AI全域获客入口 ---------------- */
.ai-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
  background: linear-gradient(120deg, var(--navy) 0%, var(--brand-dark) 55%, var(--brand) 100%);
  border-radius: var(--radius);
  padding: 36px 40px;
  box-shadow: var(--shadow);
}
.ai-entry .lab {
  display: inline-block;
  font-size: 13px; font-weight: 700; letter-spacing: 2px;
  color: #bcd6ff;
  border: 1px solid rgba(255, 255, 255, .3);
  padding: 4px 13px; border-radius: 999px; margin-bottom: 14px;
}
.ai-entry h3 { color: #fff; font-size: 26px; letter-spacing: 1px; }
.ai-entry p { color: #d6e4fb; font-size: 15px; margin-top: 8px; max-width: 660px; }
.ai-entry .btn-ghost { background: rgba(255, 255, 255, .12); color: #fff; border-color: rgba(255, 255, 255, .4); }
.ai-entry .btn-ghost:hover { background: rgba(255, 255, 255, .24); }
/* 首页案例预览 + 首页预约表单区 */
.case-preview .case-grid { margin-bottom: 30px; }
.home-form { background: var(--bg-soft); }
/* ---------------- AI GEO 业务页 ---------------- */
.hero-ai {
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(0, 86, 165, .35), transparent 60%),
    linear-gradient(160deg, #0c2d57 0%, #0a3e73 48%, #0056A5 100%);
  border-bottom: none;
}
.hero-ai .eyebrow { background: rgba(255, 255, 255, .12); color: #dbe6fb; border-color: rgba(255, 255, 255, .25); }
.hero-ai h1 { color: #fff; }
.hero-ai h1 em { color: #9cc3ff; font-style: normal; }
.hero-ai p.lead { color: #d6e4fb; }
.biz-intro p { color: var(--text-2); margin-bottom: 16px; text-align: justify; }
.effect-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 30px; margin-top: 26px; }
.effect-list li { display: flex; gap: 12px; font-size: 15.5px; color: var(--text-2); }
.effect-list li .ck { color: #1c7c3d; font-weight: 800; flex: none; }
.diff-box {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
  margin-top: 26px;
}
.diff-box .col { padding: 32px 34px; }
.diff-box .col.bad { background: #fff6f6; }
.diff-box .col.good { background: var(--blue-light); }
.diff-box .col h4 { font-size: 18px; margin-bottom: 12px; }
.diff-box .col p { color: var(--text-2); font-size: 15px; }
.diff-box .col.bad h4 { color: #c0392b; }
.diff-box .col.good h4 { color: var(--brand); }
.obj-tags { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.obj-tags span {
  background: var(--blue-light); color: var(--brand);
  border-radius: 999px; padding: 9px 18px; font-size: 14.5px; font-weight: 500;
}
.closing-slogan {
  background: linear-gradient(120deg, var(--navy), var(--brand-dark));
  color: #fff; border-radius: var(--radius); padding: 42px 36px; text-align: center;
}
.closing-slogan .big { font-size: 26px; font-weight: 800; letter-spacing: 2px; margin-bottom: 14px; }
.closing-slogan .sub { color: #cfe0fa; font-size: 16px; letter-spacing: 1px; }
/* 页脚营销二维码列 */
.footer-qr { text-align: center; }
.footer-qr img {
  width: 118px; height: 118px; background: #fff; padding: 7px;
  border: 1px solid rgba(255, 255, 255, .25); border-radius: 10px;
}
.footer-qr p { font-size: 12.5px; color: #9cc3ff; margin-top: 12px; }
/* ---------------- 首页 FAQ 常见问答 ---------------- */
.faq-list { max-width: 880px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.faq-q {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 26px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--navy);
}
.faq-q .q-mark {
  flex: none;
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--blue-light);
  color: var(--brand);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
}
.faq-q .q-text { flex: 1; }
.faq-q .arrow {
  flex: none;
  color: var(--brand);
  transition: transform .25s;
}
.faq-item.open .faq-q .arrow { transform: rotate(180deg); }
.faq-a {
  display: none;
  padding: 0 26px 24px 68px;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.85;
}
.faq-item.open .faq-a { display: block; }

/* ---------------- 微信咨询悬浮按钮 + 弹窗 ---------------- */
.wechat-fab {
  position: fixed;
  right: 22px; bottom: 96px;
  z-index: 95;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: #07c160;
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  font-size: 12px; font-weight: 600; letter-spacing: 1px;
  box-shadow: 0 8px 24px rgba(7, 193, 96, .38);
  transition: transform .2s, box-shadow .2s;
}
.wechat-fab:hover { transform: translateY(-3px); box-shadow: 0 12px 30px rgba(7, 193, 96, .5); }
.wechat-fab svg { width: 24px; height: 24px; margin-bottom: 2px; }
.wechat-modal {
  position: fixed; inset: 0;
  z-index: 210;
  background: rgba(10, 20, 40, .55);
  display: none;
  align-items: center; justify-content: center;
  padding: 24px;
}
.wechat-modal.open { display: flex; }
.wechat-card {
  position: relative;
  background: #fff;
  border-radius: 14px;
  padding: 32px 36px 30px;
  text-align: center;
  max-width: 340px; width: 100%;
  box-shadow: 0 24px 80px rgba(0, 0, 0, .3);
}
.wechat-card img {
  width: 200px; height: 200px;
  margin: 0 auto 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  object-fit: contain;
}
.wechat-card h4 { font-size: 17px; color: var(--navy); margin-bottom: 6px; }
.wechat-card p { font-size: 14px; color: var(--text-2); }
.wechat-close {
  position: absolute; top: 12px; right: 14px;
  border: none; background: none;
  font-size: 22px; color: var(--text-3);
  cursor: pointer; line-height: 1;
}
.wechat-close:hover { color: #e02e2e; }

/* ---------------- 资讯文章列表页 ---------------- */
.article-list { display: grid; grid-template-columns: 1fr; gap: 22px; max-width: 920px; margin: 0 auto; }
.article-card {
  display: flex; gap: 22px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 30px;
  box-shadow: var(--shadow);
  transition: transform .25s, box-shadow .25s;
}
.article-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.article-card .a-date {
  flex: none;
  width: 70px; height: 70px;
  border-radius: 10px;
  background: var(--blue-light);
  color: var(--brand);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
}
.article-card .a-date b { font-size: 22px; line-height: 1.1; }
.article-card .a-date span { font-size: 12px; }
.article-card .a-body { flex: 1; }
.article-card h3 { font-size: 18px; color: var(--navy); margin-bottom: 8px; line-height: 1.5; }
.article-card h3 a:hover { color: var(--brand); }
.article-card p { font-size: 14px; color: var(--text-2); }
.article-tags { margin-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; }
.article-tags span {
  font-size: 12px;
  color: var(--brand);
  background: var(--blue-light);
  border-radius: 4px;
  padding: 3px 10px;
}
.article-empty { text-align: center; color: var(--text-3); padding: 60px 0; }
/* 文章详情（预留扩展样式） */
.article-detail { max-width: 860px; margin: 0 auto; }
.article-detail h1 { font-size: 28px; color: var(--navy); margin-bottom: 16px; line-height: 1.4; }
.article-detail .a-meta {
  color: var(--text-3); font-size: 13.5px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 26px;
}
.article-detail .a-content p { margin-bottom: 16px; color: var(--text-2); text-align: justify; }
.article-detail .a-content h2 { font-size: 21px; color: var(--navy); margin: 28px 0 12px; }
.article-detail .a-content ul { list-style: disc; padding-left: 22px; color: var(--text-2); margin-bottom: 16px; }
.article-detail .a-content ul li { margin-bottom: 8px; }
.article-back { display: inline-flex; align-items: center; gap: 6px; color: var(--brand); font-size: 14px; margin-bottom: 20px; }
.article-back:hover { text-decoration: underline; }

/* ---------------- 响应式（平板 / 手机） ---------------- */
@media (max-width: 960px) {
  .engines, .about-wrap, .contact-wrap, .home-form .contact-wrap { grid-template-columns: 1fr; }
  .advantages { grid-template-columns: 1fr 1fr; }
  .case-grid { grid-template-columns: 1fr 1fr; }
  .value-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .effect-list { grid-template-columns: 1fr; }
  .diff-box { grid-template-columns: 1fr; }
  .hero h1, .hero-ai h1 { font-size: 34px; }
}
@media (max-width: 640px) {
  .nav { height: 64px; }
  .brand img { height: 42px; }
  .nav-cta { gap: 0; }
  .nav-quote { display: none; }        /* 移动端隐藏橙色按钮，收进吸底条 */
  .nav-tel { display: none; }          /* 电话收进吸底条，避免挤爆导航 */
  .nav-links {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: #0056A5;                 /* 移动端菜单同为蓝底白字 */
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, .14);
    box-shadow: var(--shadow);
    display: none;
    margin-left: 0;
    max-height: calc(100vh - 64px - 56px);   /* 留出吸底条高度 */
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .nav-links.open { display: flex; }
  .nav-links > a,
  .nav-links .nav-item > a {
    width: 100%;
    padding: 13px 0;
    border-bottom: 1px solid rgba(255, 255, 255, .12);
    color: #fff;
    font-size: 16px;
    justify-content: space-between;
  }
  /* 移动端下拉：改为直接展开的二级列表 */
  .nav-item { width: 100%; }
  .dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: rgba(255, 255, 255, .06);
    box-shadow: none;
    border-radius: 8px;
    min-width: 0;
    padding: 4px 0;
    margin: 0 0 6px;
    display: none;
  }
  .dropdown::after, .dropdown::before { display: none; }
  /* 用同等更高优先级覆盖 PC 端 hover/focus-within 的定位与变换 */
  .nav-item:hover .dropdown,
  .nav-item:focus-within .dropdown,
  .nav-item.open .dropdown {
    display: block;
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: rgba(255, 255, 255, .06);
    box-shadow: none;
    border-radius: 8px;
    min-width: 0;
    padding: 4px 0;
    margin: 0 0 6px;
  }
  .nav-item .caret { transition: transform .25s; }
  .nav-item.open .caret { transform: rotate(180deg); }
  .dropdown a {
    color: rgba(255,255,255,.9) !important;
    padding: 10px 16px;
    font-size: 15px;
  }
  .dropdown a:hover { background: rgba(255,255,255,.1); padding-left: 16px; }
  /* 吸底拨号条 */
  .mobile-bar {
    display: flex;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 99;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, .18);
  }
  /* 防止吸底条遮挡页面底部内容 */
  body { padding-bottom: 56px; }
  .menu-toggle { display: block; }
  .hero, .hero-ai { padding: 64px 0 60px; }
  .hero h1, .hero-ai h1 { font-size: 28px; }
  .hero-sub { font-size: 19px; letter-spacing: 1px; }
  .section { padding: 60px 0; }
  .advantages, .case-grid, .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .ai-entry { padding: 28px 24px; }
  .ai-entry h3 { font-size: 22px; }
  .section-head h2 { font-size: 26px; }
}
/* 中等屏幕：适当收紧间距，防止导航换行 */
@media (max-width: 1200px) and (min-width: 901px) {
  .nav-links { gap: 16px; }
  .nav-links > a, .nav-links .nav-item > a { font-size: 15px; }
  .nav-quote { padding: 9px 12px; font-size: 13.5px; }
  .nav-tel { padding: 9px 13px; font-size: 13.5px; }
  .brand { min-width: 140px; }
  .brand img { height: 46px; }
}

/* ---------- 平板及以下（≤900px）：收起为汉堡菜单 ---------- */
@media (max-width: 900px) {
  .nav { height: 64px; }
  .brand { min-width: 0; }
  .brand img { height: 44px; }
  .nav-cta { gap: 0; }
  .nav-quote { display: none; }        /* 收进吸底条 */
  .nav-tel { display: none; }          /* 收进吸底条 */
  .menu-toggle { display: block; }
  .nav-links {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: #0056A5;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, .14);
    box-shadow: var(--shadow);
    display: none;
    margin-left: 0;
    max-height: calc(100vh - 64px - 56px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .nav-links.open { display: flex; }
  .nav-links > a,
  .nav-links .nav-item > a {
    width: 100%;
    padding: 13px 0;
    border-bottom: 1px solid rgba(255, 255, 255, .12);
    color: #fff;
    font-size: 16px;
    justify-content: space-between;
  }
  .nav-item { width: 100%; }
  .dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: rgba(255, 255, 255, .06);
    box-shadow: none;
    border-radius: 8px;
    min-width: 0;
    padding: 4px 0;
    margin: 0 0 6px;
    display: none;
  }
  .dropdown::after, .dropdown::before { display: none; }
  .nav-item:hover .dropdown,
  .nav-item:focus-within .dropdown,
  .nav-item.open .dropdown {
    display: block;
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: rgba(255, 255, 255, .06);
    box-shadow: none;
    border-radius: 8px;
    min-width: 0;
    padding: 4px 0;
    margin: 0 0 6px;
  }
  .nav-item .caret { transition: transform .25s; }
  .nav-item.open .caret { transform: rotate(180deg); }
  .dropdown a {
    color: rgba(255,255,255,.9) !important;
    padding: 10px 16px;
    font-size: 15px;
  }
  .dropdown a:hover { background: rgba(255,255,255,.1); padding-left: 16px; }
  /* 吸底拨号条 */
  .mobile-bar {
    display: flex;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 99;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, .18);
  }
  body { padding-bottom: 56px; }
  /* 返回顶部上移避让吸底条 */
  .back-top { right: 16px; bottom: 72px; width: 42px; height: 42px; }
}