/* ============================================================
   福建网盟网络技术有限公司 官网样式
   风格：科技蓝 / 简洁现代 / 响应式
   ============================================================ */

:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-deep: #1e3a8a;
  --primary-light: #eff6ff;
  --primary-ghost: #dbeafe;
  --text: #1e293b;
  --text-light: #475569;
  --muted: #64748b;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --white: #ffffff;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, .08);
  --shadow: 0 8px 24px rgba(15, 23, 42, .09);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, .14);
  --grad: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  --grad-deep: linear-gradient(135deg, #1e3a8a 0%, #172554 100%);
  --container: 1180px;
  --header-h: 72px;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.75;
  font-size: 16px;
}

img { max-width: 100%; display: block; }
picture { display: contents; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

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

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-h);
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s, border-color .3s, background .3s;
}
.site-header.scrolled { box-shadow: var(--shadow-sm); border-color: var(--border); background: rgba(255,255,255,.98); }

.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }

.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--grad); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 800; letter-spacing: .5px; text-indent: .5px; flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(37, 99, 235, .35);
}
.logo-text { line-height: 1.25; }
.logo-name { font-size: 19px; font-weight: 700; letter-spacing: .5px; }
.logo-sub { font-size: 11px; color: var(--muted); letter-spacing: 1.5px; text-transform: uppercase; }

.main-nav ul { display: flex; gap: 6px; }
.main-nav a {
  display: block; padding: 8px 16px; border-radius: 8px;
  font-size: 15px; color: var(--text-light); transition: color .2s, background .2s;
}
.main-nav a:hover { color: var(--primary); background: var(--primary-light); }
.main-nav a.active { color: var(--primary); font-weight: 600; }

.header-cta { display: flex; align-items: center; gap: 14px; }
.header-phone {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; color: var(--primary); font-size: 16px; white-space: nowrap;
}
.header-phone svg { width: 18px; height: 18px; }

.menu-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.menu-toggle span { width: 24px; height: 2.5px; background: var(--text); border-radius: 2px; transition: .3s; }
.menu-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px; border-radius: 999px;
  font-size: 15px; font-weight: 600; line-height: 1.4;
  transition: transform .2s, box-shadow .2s, background .2s, color .2s, border-color .2s;
  cursor: pointer; border: 2px solid transparent;
}
.btn-primary {
  background: var(--grad); color: #fff;
  box-shadow: 0 6px 18px rgba(37, 99, 235, .35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(37, 99, 235, .45); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: transparent; }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-white { background: #fff; color: var(--primary-dark); }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(0,0,0,.2); }
.btn-ghost-light { border-color: rgba(255,255,255,.6); color: #fff; }
.btn-ghost-light:hover { background: rgba(255,255,255,.15); border-color: #fff; }
.btn-sm { padding: 9px 22px; font-size: 14px; }

/* ---------- 首屏 Hero ---------- */
.hero {
  position: relative; padding: calc(var(--header-h) + 72px) 0 90px;
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(37,99,235,.12), transparent 60%),
    radial-gradient(700px 380px at -10% 110%, rgba(30,64,175,.08), transparent 60%),
    var(--white);
  overflow: hidden;
}
.hero-inner { display: grid; grid-template-columns: 1.08fr .92fr; gap: 60px; align-items: center; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 18px; border-radius: 999px;
  background: var(--primary-light); color: var(--primary-dark);
  font-size: 14px; font-weight: 600; margin-bottom: 22px;
}
.hero-badge::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); }

.hero h1 {
  font-size: 46px; line-height: 1.28; font-weight: 800;
  letter-spacing: -.5px; margin-bottom: 20px;
}
.hero h1 .hl { color: var(--primary); }
.hero-desc { font-size: 17px; color: var(--muted); max-width: 520px; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 42px; }

.hero-stats { display: flex; gap: 0; border-top: 1px solid var(--border); padding-top: 28px; }
.hero-stat { flex: 1; }
.hero-stat + .hero-stat { border-left: 1px solid var(--border); padding-left: 28px; }
.hero-stat .num { font-size: 30px; font-weight: 800; color: var(--primary); line-height: 1.2; }
.hero-stat .num span { font-size: 17px; }
.hero-stat .label { font-size: 13.5px; color: var(--muted); }

.hero-visual { position: relative; }
.hero-visual .photo {
  border-radius: 20px; overflow: hidden; box-shadow: var(--shadow-lg);
  transform: rotate(1.2deg); border: 6px solid #fff;
}
.hero-visual .photo img { width: 100%; height: 420px; object-fit: cover; }
.float-card {
  position: absolute; background: #fff; border-radius: 14px;
  box-shadow: var(--shadow-lg); padding: 16px 20px;
  display: flex; align-items: center; gap: 14px;
  animation: float 4.5s ease-in-out infinite;
}
.float-card .icon {
  width: 42px; height: 42px; border-radius: 11px; background: var(--primary-light);
  color: var(--primary); display: flex; align-items: center; justify-content: center;
}
.float-card .icon svg { width: 22px; height: 22px; }
.float-card .t1 { font-size: 14px; font-weight: 700; }
.float-card .t2 { font-size: 12px; color: var(--muted); }
.float-card.fc1 { left: -34px; top: 34px; animation-delay: .6s; }
.float-card.fc2 { right: -26px; bottom: 42px; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

/* ---------- 通栏 Banner ---------- */
.fullwidth-banner { position: relative; background: #172554; overflow: hidden; }
.fullwidth-banner .bg {
  position: absolute; inset: 0;
  background: url("../images/banner.jpg") center 62% / cover no-repeat;
  background-image: image-set(
    url("../images/banner.webp") type("image/webp"),
    url("../images/banner.jpg") type("image/jpeg")
  );
}
.fullwidth-banner .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(23,37,84,.9) 0%, rgba(30,58,138,.72) 55%, rgba(37,99,235,.35) 100%);
}
.fullwidth-banner .inner {
  position: relative; z-index: 2; text-align: center; color: #fff;
  max-width: 820px; margin: 0 auto; padding: calc(var(--header-h) + 62px) 24px 96px;
}
.fullwidth-banner .banner-title { font-size: 32px; font-weight: 800; line-height: 1.4; margin-bottom: 14px; letter-spacing: -.3px; }
.fullwidth-banner .sub { font-size: 16px; color: rgba(255,255,255,.85); margin-bottom: 30px; }
.fullwidth-banner .points { display: flex; justify-content: center; gap: 30px; flex-wrap: wrap; margin-bottom: 34px; }
.fb-point { display: inline-flex; align-items: center; gap: 9px; font-size: 15px; font-weight: 600; }
.fb-point::before {
  content: "✓"; width: 22px; height: 22px; border-radius: 50%; flex-shrink: 0;
  background: rgba(255,255,255,.18); display: flex; align-items: center; justify-content: center; font-size: 12px;
}
.fullwidth-banner .actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* ---------- 通用 Section ---------- */
.section { padding: 88px 0; }
.section.alt { background: var(--bg); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 56px; }
.kicker {
  display: inline-block; font-size: 13.5px; font-weight: 700;
  color: var(--primary); background: var(--primary-light);
  padding: 5px 16px; border-radius: 999px; letter-spacing: 2px;
  text-transform: uppercase; margin-bottom: 14px;
}
.section-head h2 { font-size: 34px; font-weight: 800; line-height: 1.35; margin-bottom: 14px; letter-spacing: -.3px; }
.section-head p { color: var(--muted); font-size: 16px; }

/* ---------- 服务卡片 ---------- */
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.service-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px 30px; transition: transform .25s, box-shadow .25s, border-color .25s;
  position: relative; overflow: hidden;
}
.service-card::after {
  content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 0;
  background: var(--grad); transition: width .3s;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.service-card:hover::after { width: 100%; }
.service-icon {
  width: 58px; height: 58px; border-radius: 15px;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center; margin-bottom: 22px;
}
.service-icon svg { width: 28px; height: 28px; }
.service-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.service-card p { font-size: 14.5px; color: var(--muted); margin-bottom: 18px; min-height: 76px; }
.service-link { font-size: 14px; font-weight: 600; color: var(--primary); display: inline-flex; align-items: center; gap: 6px; }
.service-link::after { content: "→"; transition: transform .2s; }
.service-link:hover::after { transform: translateX(4px); }

/* ---------- 优势 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.feature-item {
  display: flex; gap: 18px; padding: 26px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  transition: box-shadow .25s, transform .25s;
}
.feature-item:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.feature-num {
  font-size: 34px; font-weight: 800; line-height: 1;
  background: linear-gradient(180deg, #60a5fa, #2563eb);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  min-width: 52px;
}
.feature-item h3 { font-size: 17.5px; font-weight: 700; margin-bottom: 8px; }
.feature-item p { font-size: 14px; color: var(--muted); }

/* ---------- 案例卡片 ---------- */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.case-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); transition: transform .25s, box-shadow .25s;
  display: flex; flex-direction: column;
  scroll-margin-top: 96px;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.case-thumb { position: relative; overflow: hidden; height: 230px; }
.case-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s; }
.case-card:hover .case-thumb img { transform: scale(1.06); }
.case-cat {
  position: absolute; left: 14px; top: 14px; z-index: 2;
  background: rgba(30, 58, 138, .85); color: #fff; backdrop-filter: blur(4px);
  font-size: 12.5px; font-weight: 600; padding: 4px 13px; border-radius: 999px;
}
.case-body { padding: 24px 26px 26px; flex: 1; display: flex; flex-direction: column; }
.case-body h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.case-body p { font-size: 14px; color: var(--muted); flex: 1; }
.case-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.case-tags span {
  font-size: 12px; color: var(--primary-dark); background: var(--primary-light);
  padding: 3px 11px; border-radius: 6px;
}

/* ---------- 流程 ---------- */
.process-flow { display: grid; grid-template-columns: repeat(7, 1fr); gap: 14px; counter-reset: step; }
.p-step { text-align: center; position: relative; padding: 0 4px; }
.p-step .dot {
  width: 58px; height: 58px; border-radius: 50%; margin: 0 auto 16px;
  background: #fff; border: 2px solid var(--primary-ghost); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 21px; font-weight: 800; position: relative; z-index: 2;
  transition: background .25s, color .25s, border-color .25s, transform .25s;
}
.p-step:hover .dot { background: var(--primary); color: #fff; border-color: var(--primary); transform: scale(1.08); }
.p-step:not(:last-child)::before {
  content: ""; position: absolute; top: 29px; left: calc(50% + 36px);
  width: calc(100% - 72px); height: 2px;
  background: repeating-linear-gradient(90deg, var(--primary-ghost) 0 8px, transparent 8px 14px);
}
.p-step h3 { font-size: 15.5px; font-weight: 700; margin-bottom: 4px; }
.p-step p { font-size: 12.5px; color: var(--muted); line-height: 1.6; }

/* ---------- 理念引用块 ---------- */
.quote-section {
  background: var(--grad-deep); color: #fff; padding: 88px 0;
  position: relative; overflow: hidden;
}
.quote-section::before {
  content: ""; position: absolute; right: -80px; top: -80px;
  width: 340px; height: 340px; border-radius: 50%;
  border: 46px solid rgba(255,255,255,.06);
}
.quote-section::after {
  content: ""; position: absolute; left: -60px; bottom: -110px;
  width: 260px; height: 260px; border-radius: 50%;
  border: 34px solid rgba(255,255,255,.05);
}
.quote-inner { text-align: center; max-width: 820px; margin: 0 auto; position: relative; z-index: 2; }
.quote-mark { font-size: 60px; line-height: .6; color: rgba(255,255,255,.35); font-family: Georgia, serif; }
.quote-inner h2 { font-size: 30px; font-weight: 700; line-height: 1.6; margin: 18px 0 22px; }
.quote-inner p { color: rgba(255,255,255,.82); font-size: 16px; }

/* ---------- CTA 横幅 ---------- */
.cta-banner {
  margin: 0 0 88px; border-radius: 24px; overflow: hidden; position: relative;
  background: var(--grad); color: #fff; padding: 64px 56px;
  display: flex; align-items: center; justify-content: space-between; gap: 40px;
}
.cta-banner::before {
  content: ""; position: absolute; right: -70px; bottom: -110px;
  width: 300px; height: 300px; border-radius: 50%;
  border: 40px solid rgba(255,255,255,.12);
}
.cta-banner h2 { font-size: 30px; font-weight: 800; margin-bottom: 10px; position: relative; }
.cta-banner p { color: rgba(255,255,255,.85); font-size: 16px; position: relative; }
.cta-banner .btn { position: relative; flex-shrink: 0; }

/* ---------- 子页面横幅 ---------- */
.page-banner {
  padding: calc(var(--header-h) + 64px) 0 64px;
  background:
    radial-gradient(800px 300px at 80% -20%, rgba(255,255,255,.14), transparent 60%),
    var(--grad-deep);
  color: #fff; position: relative; overflow: hidden;
}
.page-banner h1 { font-size: 36px; font-weight: 800; margin-bottom: 10px; position: relative; }
.page-banner p { color: rgba(255,255,255,.8); font-size: 16px; position: relative; }
.breadcrumb { display: flex; gap: 10px; margin-top: 18px; font-size: 13.5px; color: rgba(255,255,255,.65); position: relative; }
.breadcrumb a:hover { color: #fff; }

/* ---------- 关于我们 ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.about-grid + .about-grid { margin-top: 88px; }
.about-grid.flip .img-box { order: 2; }
.img-box { border-radius: 20px; overflow: hidden; box-shadow: var(--shadow-lg); position: relative; }
.img-box img { width: 100%; height: 380px; object-fit: cover; transition: transform .5s; }
.img-box:hover img { transform: scale(1.03); }
.about-text .kicker { margin-bottom: 12px; }
.about-text h2 { font-size: 29px; font-weight: 800; margin-bottom: 18px; line-height: 1.4; }
.about-text p { color: var(--text-light); font-size: 15.5px; margin-bottom: 14px; }
.check-list { margin-top: 22px; display: grid; gap: 12px; }
.check-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; color: var(--text-light); }
.check-list a { color: var(--primary); }
.check-list a:hover { text-decoration: underline; }
.related-links { display: grid; gap: 10px; margin-top: 18px; }
.related-links a { color: var(--primary); font-weight: 600; }
.related-links a:hover { text-decoration: underline; }
.check-list .ck {
  width: 22px; height: 22px; border-radius: 50%; flex-shrink: 0; margin-top: 3px;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 800;
}

/* ---------- 服务详情页 ---------- */
.service-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; padding: 64px 0; }
.service-detail + .service-detail { border-top: 1px solid var(--border); }
.service-detail.flip .sd-img { order: 2; }
.sd-img { border-radius: 20px; overflow: hidden; box-shadow: var(--shadow); }
.sd-img img { width: 100%; height: 350px; object-fit: cover; }
.sd-text h2 { font-size: 27px; font-weight: 800; margin-bottom: 14px; }
.sd-text > p { color: var(--text-light); font-size: 15.5px; margin-bottom: 20px; }
.sd-text a:not(.btn) { color: var(--primary); font-weight: 600; }
.sd-text a:not(.btn):hover { text-decoration: underline; }
.sd-list { display: grid; gap: 11px; margin-bottom: 22px; }
.sd-list li { display: flex; gap: 11px; font-size: 14.5px; color: var(--text-light); align-items: flex-start; }
.sd-list li::before {
  content: "▸"; color: var(--primary); font-weight: 800; flex-shrink: 0;
}

/* ---------- 案例筛选 ---------- */
.filter-bar { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-bottom: 48px; }
.filter-btn {
  padding: 9px 24px; border-radius: 999px; font-size: 14.5px; font-weight: 600;
  color: var(--text-light); background: #fff; border: 1.5px solid var(--border);
  transition: all .22s;
}
.filter-btn:hover { color: var(--primary); border-color: var(--primary-ghost); }
.filter-btn.active { background: var(--grad); color: #fff; border-color: transparent; box-shadow: 0 5px 14px rgba(37,99,235,.3); }
.case-card.hidden { display: none; }

/* ---------- 时间线（流程页） ---------- */
.timeline { position: relative; max-width: 860px; margin: 0 auto; padding-left: 34px; }
.timeline::before {
  content: ""; position: absolute; left: 10px; top: 8px; bottom: 8px; width: 2.5px;
  background: linear-gradient(180deg, var(--primary), var(--primary-ghost));
}
.tl-item { position: relative; padding: 0 0 44px 30px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -34px; top: 6px;
  width: 22px; height: 22px; border-radius: 50%;
  background: #fff; border: 5.5px solid var(--primary);
  box-shadow: 0 0 0 5px rgba(37,99,235,.14);
}
.tl-item h3 { font-size: 19px; font-weight: 700; margin-bottom: 8px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.tl-item h3 .step-tag {
  font-size: 12.5px; font-weight: 700; color: var(--primary-dark);
  background: var(--primary-light); padding: 2px 12px; border-radius: 999px;
}
.tl-item p { color: var(--muted); font-size: 15px; max-width: 720px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 860px; margin: 0 auto; display: grid; gap: 14px; }
.faq-item { background: #fff; border: 1.5px solid var(--border); border-radius: 14px; overflow: hidden; transition: border-color .25s, box-shadow .25s; }
.faq-item.open { border-color: var(--primary-ghost); box-shadow: var(--shadow-sm); }
.faq-q {
  width: 100%; text-align: left; padding: 20px 26px;
  display: flex; justify-content: space-between; align-items: center; gap: 18px;
  font-size: 16.5px; font-weight: 700; color: var(--text);
}
.faq-q .arrow {
  width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  transition: transform .3s, background .3s, color .3s; font-size: 15px;
}
.faq-item.open .faq-q .arrow { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-a-inner { padding: 0 26px 22px; color: var(--muted); font-size: 15px; }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 56px; align-items: start; }
.contact-cards { display: grid; gap: 18px; }
.contact-card {
  display: flex; gap: 18px; align-items: flex-start;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 26px; transition: box-shadow .25s, transform .25s;
}
.contact-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.cc-icon {
  width: 50px; height: 50px; border-radius: 13px; flex-shrink: 0;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.cc-icon svg { width: 24px; height: 24px; }
.contact-card h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 5px; }
.contact-card p { font-size: 15px; color: var(--muted); word-break: break-all; }
.contact-card a { color: var(--primary); font-weight: 600; }
.contact-card a.tel-link { color: var(--primary); font-weight: 700; font-size: 20px; }
.section-head a { color: var(--primary); font-weight: 600; }
#faq { scroll-margin-top: 96px; }

.contact-form-wrap { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow-sm); }
.contact-form-wrap h2 { font-size: 22px; font-weight: 800; margin-bottom: 6px; }
.contact-form-wrap > p { color: var(--muted); font-size: 14px; margin-bottom: 26px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.form-group label .req { color: #dc2626; margin-left: 2px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 15px; border: 1.5px solid var(--border);
  border-radius: 10px; font-size: 15px; font-family: inherit;
  background: var(--bg); transition: border-color .2s, background .2s, box-shadow .2s;
  color: var(--text);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary); background: #fff;
  box-shadow: 0 0 0 4px rgba(37,99,235,.1);
}
.form-tip { font-size: 12.5px; color: var(--muted); margin-top: 14px; text-align: center; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0f1c3f; color: rgba(255,255,255,.75); padding: 68px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 44px; padding-bottom: 48px; }
.footer-brand .logo { margin-bottom: 18px; }
.footer-brand .logo-name { color: #fff; }
.footer-brand .logo-sub { color: rgba(255,255,255,.5); }
.footer-brand p { font-size: 14px; color: rgba(255,255,255,.6); margin-bottom: 18px; }
.footer-col h3 { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 20px; position: relative; padding-bottom: 12px; }
.footer-col h3::after { content: ""; position: absolute; left: 0; bottom: 0; width: 28px; height: 3px; border-radius: 2px; background: var(--primary); }
.footer-col ul { display: grid; gap: 11px; }
.footer-col a, .footer-col li { font-size: 14px; color: rgba(255,255,255,.62); transition: color .2s; }
.footer-col a:hover { color: #fff; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-contact svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 5px; color: var(--primary); }
.footer-contact .phone { color: #fff; font-size: 17px; font-weight: 700; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1); padding: 22px 0;
  display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 13px; color: rgba(255,255,255,.5);
}
.footer-bottom a { color: rgba(255,255,255,.5); }
.footer-bottom a:hover { color: #fff; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 30px; z-index: 900;
  width: 46px; height: 46px; border-radius: 50%;
  background: #fff; color: var(--primary); box-shadow: var(--shadow);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .3s, transform .3s, visibility .3s;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--primary); color: #fff; }
.back-top svg { width: 20px; height: 20px; }

/* ---------- 滚动渐入动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .float-card { animation: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero h1 { font-size: 38px; }
  .hero-inner { gap: 40px; }
  .service-grid, .feature-grid, .case-grid { grid-template-columns: repeat(2, 1fr); }
  .process-flow { grid-template-columns: repeat(4, 1fr); row-gap: 36px; }
  .p-step:not(:last-child)::before { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .hero { padding: calc(var(--header-h) + 46px) 0 64px; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero h1 { font-size: 31px; }
  .hero-stats { flex-wrap: wrap; gap: 18px; }
  .hero-stat { flex: 1 1 40%; }
  .hero-stat + .hero-stat { border-left: none; padding-left: 0; }
  .hero-visual .photo img { height: 300px; }
  .float-card { display: none; }
  .fullwidth-banner .inner { padding: calc(var(--header-h) + 40px) 24px 64px; }
  .fullwidth-banner .banner-title { font-size: 24px; }
  .fullwidth-banner .sub { font-size: 14.5px; }
  .fullwidth-banner .points { gap: 12px 20px; margin-bottom: 28px; }
  .fb-point { font-size: 13.5px; }
  .about-grid, .service-detail, .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .about-grid.flip .img-box, .service-detail.flip .sd-img { order: 0; }
  .img-box img, .sd-img img { height: 280px; }
  .cta-banner { flex-direction: column; text-align: center; padding: 44px 30px; }
  .section-head h2 { font-size: 27px; }
  .page-banner h1 { font-size: 28px; }
  .process-flow { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .contact-form-wrap { padding: 28px 22px; }

  /* 移动端导航 */
  .menu-toggle { display: flex; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow); max-height: 0; overflow: hidden;
    transition: max-height .35s ease;
  }
  .main-nav.open { max-height: 480px; }
  .main-nav ul { flex-direction: column; padding: 12px 24px 20px; gap: 2px; }
  .main-nav a { padding: 12px 14px; font-size: 16px; }
  .header-phone span { display: none; }
}

@media (max-width: 560px) {
  .service-grid, .feature-grid, .case-grid { grid-template-columns: 1fr; }
  .process-flow { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .footer-bottom { justify-content: center; text-align: center; }
  .btn { width: 100%; }
  .hero-actions { gap: 12px; }
}



/* ---------- 404 页面 ---------- */
.error-section {
  min-height: calc(100vh - var(--header-h));
  display: flex; align-items: center;
  padding: calc(var(--header-h) + 56px) 0 56px;
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(37,99,235,.12), transparent 60%),
    radial-gradient(700px 380px at -10% 110%, rgba(30,64,175,.08), transparent 60%),
    var(--bg);
}
.error-inner { text-align: center; max-width: 720px; }
.error-code {
  font-size: 150px; font-weight: 800; line-height: 1; letter-spacing: -4px;
  background: linear-gradient(180deg, #60a5fa, #1e40af);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  margin-bottom: 6px; user-select: none;
}
.error-inner h1 { font-size: 30px; font-weight: 800; margin-bottom: 16px; letter-spacing: -.3px; }
.error-desc { color: var(--muted); font-size: 16px; margin-bottom: 34px; }
.error-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; margin-bottom: 36px; }
.error-links {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 12px;
  padding-top: 24px; border-top: 1px solid var(--border);
  font-size: 14.5px;
}
.error-links a { color: var(--text-light); font-weight: 600; transition: color .2s; }
.error-links a:hover { color: var(--primary); }
.error-links span { color: var(--border); }

@media (max-width: 768px) {
  .error-section { padding: calc(var(--header-h) + 40px) 0 48px; }
  .error-code { font-size: 104px; letter-spacing: -2px; }
  .error-inner h1 { font-size: 24px; }
  .error-desc { font-size: 14.5px; }
  .error-actions { gap: 12px; }
}

/* 404 页脚贴底（仅限 404 页面） */
body.error-page { display: flex; flex-direction: column; min-height: 100vh; }
.error-page .error-footer { margin-top: auto; }