:root {
  --primary: #1d4ed8;
  --primary-dark: #1e40af;
  --accent: #0ea5e9;
  --bg: #ffffff;
  --bg-alt: #f6f8fc;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(30, 64, 175, .08);
}
* { 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;
}
.container { width: min(1120px, 92%); margin: 0 auto; }
.container-narrow { width: min(760px, 92%); margin: 0 auto; }
h1 { font-size: clamp(30px, 4.5vw, 46px); line-height: 1.25; letter-spacing: -.5px; }
h2 { font-size: clamp(24px, 3vw, 32px); text-align: center; letter-spacing: -.3px; }
h3 { font-size: 18px; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
em { color: #e11d48; font-style: normal; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 22px; border-radius: 10px; border: 1px solid transparent;
  font-size: 15px; cursor: pointer; transition: .2s; font-weight: 500;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; box-shadow: 0 6px 18px rgba(29, 78, 216, .3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(29, 78, 216, .4); }
.btn-ghost { border-color: var(--border); color: var(--text); background: #fff; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-light { background: #fff; color: var(--primary); }
.btn-light:hover { transform: translateY(-2px); }
.btn-lg { padding: 14px 32px; font-size: 16px; }
.btn-block { width: 100%; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; gap: 16px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; flex-shrink: 1; min-width: 0; }
.logo-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.logo-mark { color: var(--primary); font-size: 20px; }
.main-nav { display: flex; align-items: center; gap: 26px; font-size: 15px; color: var(--muted); }
.main-nav a:hover { color: var(--primary); }
.nav-phone { color: var(--primary); font-weight: 600; }
.header-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.nav-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; color: var(--text); }

/* ---------- Hero ---------- */
.hero { padding: 84px 0 72px; background:
  radial-gradient(60% 80% at 85% 10%, rgba(14, 165, 233, .12), transparent),
  radial-gradient(50% 70% at 10% 20%, rgba(29, 78, 216, .10), transparent), var(--bg); }
.hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.badge { display: inline-block; background: rgba(29, 78, 216, .08); color: var(--primary); border: 1px solid rgba(29, 78, 216, .2); padding: 5px 14px; border-radius: 999px; font-size: 13px; margin-bottom: 18px; }
.hero-sub { color: var(--muted); font-size: 17px; margin: 18px 0 28px; max-width: 34em; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 40px; margin-top: 40px; }
.stat strong { display: block; font-size: 28px; color: var(--primary); }
.stat span { color: var(--muted); font-size: 13px; }
.hero-art { position: relative; height: 320px; }
.orb { position: absolute; border-radius: 50%; filter: blur(6px); opacity: .55; }
.orb-1 { width: 220px; height: 220px; background: linear-gradient(135deg, #93c5fd, #38bdf8); top: 0; right: 20px; }
.orb-2 { width: 130px; height: 130px; background: linear-gradient(135deg, #c4b5fd, #818cf8); bottom: 10px; left: 10px; }
.glass-card {
  position: absolute; inset: 40px 40px 40px 90px; background: rgba(255, 255, 255, .75);
  backdrop-filter: blur(14px); border: 1px solid rgba(255, 255, 255, .9);
  border-radius: 18px; box-shadow: var(--shadow); padding: 26px;
  display: flex; flex-direction: column; gap: 10px; justify-content: center;
}
.glass-row { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; }
.glass-row.muted { color: var(--muted); font-weight: 400; font-size: 13px; }
.dot { width: 9px; height: 9px; border-radius: 50%; }
.dot.ok { background: #10b981; }
.glass-score { font-size: 44px; font-weight: 800; color: var(--primary); line-height: 1; }
.glass-score span { font-size: 16px; color: var(--muted); font-weight: 500; }
.glass-bar { height: 8px; background: #e2e8f0; border-radius: 99px; overflow: hidden; }
.glass-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 99px; }

/* ---------- 区块 ---------- */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.section-sub { text-align: center; color: var(--muted); margin: 10px 0 40px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; transition: .25s; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(29, 78, 216, .3); }
.service-card .card-icon {
  width: 46px; height: 46px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(29, 78, 216, .12), rgba(14, 165, 233, .12));
  color: var(--primary); font-weight: 800; font-size: 20px; margin-bottom: 16px;
}
.service-card p { color: var(--muted); font-size: 14px; margin-top: 8px; }
.feature { text-align: center; padding: 10px; }
.feature-icon { font-size: 34px; display: block; margin-bottom: 12px; }
.feature p { color: var(--muted); font-size: 14px; margin-top: 8px; }
.about-inner { max-width: 800px; }
.about-text { color: var(--muted); font-size: 16px; margin-top: 16px; white-space: pre-line; }
.about-inner h2 { text-align: left; }

/* ---------- 文章卡片 ---------- */
.article-card { display: flex; flex-direction: column; gap: 10px; }
.article-card h3 { font-size: 17px; }
.article-card p { color: var(--muted); font-size: 14px; flex: 1; }
.article-card time { color: #94a3b8; font-size: 13px; }
.article-tag { align-self: flex-start; background: rgba(14, 165, 233, .1); color: var(--accent); font-size: 12px; padding: 3px 10px; border-radius: 999px; }
.empty-tip { text-align: center; color: var(--muted); }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 18px 22px; }
.faq-item summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px; font-weight: 600; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item[open] .faq-arrow { transform: rotate(180deg); }
.faq-arrow { color: var(--primary); transition: .2s; }
.faq-a { color: var(--muted); margin-top: 12px; border-top: 1px dashed var(--border); padding-top: 12px; }

/* ---------- CTA ---------- */
.cta-band { background: linear-gradient(135deg, var(--primary-dark), var(--accent)); color: #fff; padding: 64px 0; text-align: center; }
.cta-band p { opacity: .9; margin: 12px 0 26px; }

/* ---------- 文章页 ---------- */
.article-page { padding: 48px 0; }
.breadcrumb ol { display: flex; gap: 8px; list-style: none; color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.breadcrumb li:not(:last-child)::after { content: "/"; margin-left: 8px; color: #cbd5e1; }
.breadcrumb a:hover { color: var(--primary); }
.article-meta { color: var(--muted); font-size: 14px; margin: 14px 0 30px; display: flex; gap: 10px; }
.article-content { font-size: 16px; }
.article-content h2 { text-align: left; font-size: 24px; margin: 34px 0 14px; padding-left: 12px; border-left: 4px solid var(--primary); }
.article-content h3 { margin: 22px 0 10px; }
.article-content p { margin: 12px 0; color: #334155; }
.article-content ul, .article-content ol { padding-left: 24px; margin: 12px 0; color: #334155; }
.article-content table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
.article-content th, .article-content td { border: 1px solid var(--border); padding: 10px 14px; text-align: left; }
.article-content th { background: var(--bg-alt); }
.article-cta { margin-top: 48px; background: var(--bg-alt); border-radius: var(--radius); padding: 30px; text-align: center; }
.article-cta h2 { margin-bottom: 16px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0f172a; color: #94a3b8; padding: 56px 0 0; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1.4fr; gap: 40px; padding-bottom: 40px; }
.footer-logo { color: #fff; }
.footer-desc { margin-top: 14px; font-size: 13px; line-height: 1.8; }
.footer-h { color: #fff; font-size: 15px; margin-bottom: 14px; }
.site-footer a { display: block; margin-bottom: 8px; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #1e293b; padding: 18px 0; font-size: 13px; }

/* ---------- 弹窗 ---------- */
.modal-mask {
  position: fixed; inset: 0; background: rgba(15, 23, 42, .55); z-index: 200;
  display: flex; align-items: center; justify-content: center; padding: 20px;
  opacity: 0; visibility: hidden; transition: .25s;
}
.modal-mask.show { opacity: 1; visibility: visible; }
.modal {
  background: #fff; border-radius: 18px; width: min(440px, 100%);
  padding: 32px 30px; position: relative; transform: translateY(16px) scale(.97); transition: .25s;
  max-height: 90vh; overflow: auto;
}
.modal-mask.show .modal { transform: none; }
.modal h2 { text-align: left; font-size: 22px; }
.modal-sub { color: var(--muted); font-size: 13px; margin: 8px 0 20px; }
.modal-close { position: absolute; top: 14px; right: 16px; background: none; border: none; font-size: 26px; color: var(--muted); cursor: pointer; line-height: 1; }
.form-field { margin-bottom: 14px; }
.form-field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.form-field input, .form-field textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 14px; font-size: 14px; font-family: inherit; transition: .2s; background: #f8fafc;
}
.form-field input:focus, .form-field textarea:focus { outline: none; border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(29, 78, 216, .12); }
.form-msg { margin-top: 12px; font-size: 13px; text-align: center; min-height: 18px; }
.form-msg.ok { color: #059669; }
.form-msg.err { color: #e11d48; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-art { display: none; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex; position: fixed; top: 66px; left: 0; right: 0; z-index: 99;
    flex-direction: column; align-items: flex-start; gap: 4px;
    background: #fff; border-bottom: 1px solid var(--border); padding: 12px 5%;
  }
  .main-nav.open a { padding: 10px 0; width: 100%; }
  .nav-toggle { display: block; }
  .header-right .btn-consult { display: none; }
  .grid-4 { grid-template-columns: 1fr; }
  .hero { padding: 56px 0; }
  .hero-stats { gap: 22px; flex-wrap: wrap; }
}