/* ================= 嘉一知行官网 · 简约大气 ================= */
:root {
  --primary: #0e4da4;
  --primary-dark: #093a7c;
  --primary-light: #2b7de9;
  --accent: #1f6fd6;
  --ink: #1a2233;
  --muted: #5a6472;
  --line: #e5eaf1;
  --bg-soft: #f6f8fb;
  --white: #ffffff;
  --success: #0f8a4b;
  --danger: #c0392b;
  --radius: 10px;
  --shadow-sm: 0 1px 3px rgba(15, 35, 70, 0.08);
  --shadow-md: 0 6px 24px rgba(15, 35, 70, 0.10);
}

* { 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(--ink);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; font-size: 15px; }

.container { width: min(1160px, 92%); margin: 0 auto; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 18px; letter-spacing: 1px;
}
.brand-text .cn { font-size: 18px; font-weight: 700; letter-spacing: 2px; }
.brand-text .en { font-size: 11px; color: var(--muted); letter-spacing: 1px; text-transform: uppercase; }

.main-nav { display: flex; gap: 34px; }
.main-nav a {
  font-size: 15px; color: var(--ink); padding: 6px 2px;
  border-bottom: 2px solid transparent; transition: all 0.2s;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary); border-bottom-color: var(--primary); }

.nav-actions { display: flex; align-items: center; gap: 12px; }
.user-chip {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: 999px; padding: 5px 14px 5px 6px; font-size: 14px;
}
.user-avatar {
  width: 30px; height: 30px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 600;
}
.link-btn { background: none; border: none; color: var(--muted); font-size: 13px; padding: 4px; }
.link-btn:hover { color: var(--danger); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: var(--radius); border: 1px solid transparent;
  font-size: 15px; padding: 12px 30px; transition: all 0.2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-ghost:hover { background: var(--primary); color: #fff; }
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(43, 125, 233, 0.16), transparent 60%),
    radial-gradient(700px 380px at 8% 110%, rgba(14, 77, 164, 0.10), transparent 60%),
    linear-gradient(180deg, #f7fafd 0%, #ffffff 100%);
  padding: 96px 0 104px;
}
.hero-inner { display: flex; align-items: center; gap: 60px; }
.hero-copy { flex: 1.15; }
.hero-eyebrow {
  display: inline-block; font-size: 13px; letter-spacing: 3px;
  color: var(--primary); background: rgba(43, 125, 233, 0.10);
  padding: 6px 16px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 { font-size: 44px; font-weight: 700; line-height: 1.35; letter-spacing: 1px; }
.hero h1 .hl { color: var(--primary); }
.hero p.lead { margin: 22px 0 36px; font-size: 17px; color: var(--muted); max-width: 540px; }
.hero-actions { display: flex; gap: 16px; }

.hero-visual { flex: 1; display: flex; justify-content: center; }
.hero-card {
  width: 340px; background: #fff; border: 1px solid var(--line);
  border-radius: 18px; box-shadow: var(--shadow-md); overflow: hidden;
}
.hero-card .top {
  height: 120px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  position: relative;
}
.hero-card .top svg { position: absolute; right: 14px; bottom: 12px; opacity: 0.85; }
.hero-card .body { padding: 22px 24px 26px; }
.hero-card .body h3 { font-size: 16px; margin-bottom: 10px; }
.hero-card .row {
  display: flex; justify-content: space-between; font-size: 13px;
  color: var(--muted); padding: 9px 0; border-bottom: 1px dashed var(--line);
}
.hero-card .row b { color: var(--ink); font-weight: 600; }

/* ---------- 通用区块 ---------- */
.section { padding: 92px 0; }
.section.soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.section-head .kicker { color: var(--primary); font-size: 14px; letter-spacing: 3px; font-weight: 600; }
.section-head h2 { font-size: 32px; margin: 10px 0 14px; letter-spacing: 1px; }
.section-head p { color: var(--muted); font-size: 15.5px; }

/* ---------- 优势条 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.feature {
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  padding: 30px 26px; transition: all 0.25s;
}
.feature:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); border-color: rgba(43, 125, 233, 0.35); }
.feature .icon {
  width: 48px; height: 48px; border-radius: 12px; margin-bottom: 18px;
  background: rgba(43, 125, 233, 0.10); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.feature h3 { font-size: 17px; margin-bottom: 8px; }
.feature p { font-size: 14px; color: var(--muted); }

/* ---------- 产品卡片 ---------- */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.product-card {
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  overflow: hidden; transition: all 0.25s; display: flex; flex-direction: column;
}
.product-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.product-card .cover {
  height: 148px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #eef4fc 0%, #f7fafe 100%); color: var(--primary);
}
.product-card .info { padding: 24px 26px 28px; flex: 1; display: flex; flex-direction: column; }
.product-card h3 { font-size: 18px; margin-bottom: 8px; }
.product-card .en { font-size: 12px; color: var(--muted); letter-spacing: 1px; text-transform: uppercase; margin-bottom: 12px; }
.product-card p { font-size: 14px; color: var(--muted); flex: 1; }
.product-card .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tag {
  font-size: 12px; color: var(--primary); background: rgba(43, 125, 233, 0.09);
  padding: 3px 10px; border-radius: 999px;
}

/* ---------- 关于页 ---------- */
.about-split { display: flex; gap: 60px; align-items: center; }
.about-split .text { flex: 1.1; }
.about-split .text h2 { font-size: 30px; margin-bottom: 18px; }
.about-split .text p { color: var(--muted); margin-bottom: 14px; font-size: 15.5px; }
.about-visual {
  flex: 0.9; height: 340px; border-radius: 18px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  color: #fff; text-align: center; box-shadow: var(--shadow-md);
}
.about-visual .num { font-size: 52px; font-weight: 700; }
.about-visual .lab { font-size: 14px; opacity: 0.85; letter-spacing: 2px; margin-top: 6px; }

.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.value-item { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 30px 28px; }
.value-item .no { font-size: 30px; font-weight: 700; color: rgba(14, 77, 164, 0.18); }
.value-item h3 { font-size: 17px; margin: 6px 0 10px; }
.value-item p { font-size: 14px; color: var(--muted); }

.timeline { max-width: 760px; margin: 0 auto; }
.timeline-item { display: flex; gap: 24px; padding-bottom: 34px; position: relative; }
.timeline-item::before {
  content: ""; position: absolute; left: 68px; top: 26px; bottom: 0;
  width: 2px; background: var(--line);
}
.timeline-item:last-child::before { display: none; }
.timeline-item .year {
  width: 62px; font-weight: 700; color: var(--primary); font-size: 16px; text-align: right; flex-shrink: 0;
}
.timeline-item .dot {
  width: 14px; height: 14px; border-radius: 50%; background: #fff;
  border: 3px solid var(--primary); flex-shrink: 0; margin-top: 6px; z-index: 1;
}
.timeline-item .content h4 { font-size: 16px; margin-bottom: 6px; }
.timeline-item .content p { font-size: 14px; color: var(--muted); }

/* ---------- 联系页 ---------- */
.contact-wrap { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 46px; align-items: start; }
.contact-info-card {
  background: linear-gradient(150deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: 16px; color: #fff; padding: 38px 34px; box-shadow: var(--shadow-md);
}
.contact-info-card h3 { font-size: 20px; margin-bottom: 22px; letter-spacing: 1px; }
.contact-line { display: flex; gap: 14px; margin-bottom: 20px; align-items: flex-start; }
.contact-line .ic {
  width: 38px; height: 38px; border-radius: 10px; background: rgba(255, 255, 255, 0.14);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.contact-line .t { font-size: 13px; opacity: 0.75; margin-bottom: 3px; }
.contact-line .v { font-size: 15px; font-weight: 500; line-height: 1.7; overflow-wrap: anywhere; }
.contact-line .v a { color: inherit; text-decoration: none; transition: opacity 0.2s ease; }
.contact-line .v a:hover, .contact-line .v a:focus-visible { opacity: 0.78; text-decoration: underline; text-underline-offset: 3px; }

.form-card { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 38px 36px; box-shadow: var(--shadow-sm); }
.form-card h3 { font-size: 20px; margin-bottom: 6px; }
.form-card .sub { 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; margin-bottom: 7px; color: var(--ink); }
.form-group label .req { color: var(--danger); margin-left: 2px; }
.form-control {
  width: 100%; padding: 11px 14px; border: 1px solid var(--line);
  border-radius: 8px; background: #fbfcfe; transition: border 0.2s, box-shadow 0.2s;
}
.form-control:focus { outline: none; border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(43, 125, 233, 0.12); background: #fff; }
textarea.form-control { resize: vertical; min-height: 110px; }
.field-error { font-size: 12.5px; color: var(--danger); margin-top: 5px; display: none; }
.form-msg { margin-top: 14px; font-size: 14px; display: none; border-radius: 8px; padding: 10px 14px; }
.form-msg.success { display: block; background: rgba(15, 138, 75, 0.08); color: var(--success); }
.form-msg.error { display: block; background: rgba(192, 57, 43, 0.07); color: var(--danger); }

/* ---------- 资料中心 ---------- */
.doc-panel { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 34px 32px; }
.doc-login-tip {
  text-align: center; padding: 46px 20px; color: var(--muted);
}
.doc-login-tip .btn { margin-top: 18px; }
.doc-list { margin-top: 26px; }
.doc-item {
  display: flex; align-items: center; gap: 16px; padding: 15px 6px;
  border-bottom: 1px dashed var(--line);
}
.doc-item:last-child { border-bottom: none; }
.doc-icon {
  width: 42px; height: 42px; border-radius: 10px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(43, 125, 233, 0.10); color: var(--primary); font-size: 12px; font-weight: 700;
}
.doc-meta { flex: 1; min-width: 0; }
.doc-meta .t { font-size: 15px; font-weight: 600; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.doc-meta .s { font-size: 12.5px; color: var(--muted); margin-top: 3px; }
.doc-actions { display: flex; gap: 10px; flex-shrink: 0; }
.doc-empty { text-align: center; color: var(--muted); padding: 34px 0; font-size: 14px; }
.upload-area { border-top: 1px solid var(--line); padding-top: 24px; margin-top: 8px; }

/* ---------- 子页横幅 ---------- */
.page-banner {
  background:
    radial-gradient(800px 300px at 90% 0%, rgba(43, 125, 233, 0.35), transparent 60%),
    linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
  color: #fff; padding: 68px 0 72px;
}
.page-banner .kicker { font-size: 13px; letter-spacing: 4px; opacity: 0.82; font-weight: 600; }
.page-banner h1 { font-size: 36px; letter-spacing: 2px; margin: 8px 0 12px; font-weight: 700; }
.page-banner p { opacity: 0.9; font-size: 15.5px; max-width: 760px; }

/* ---------- 数据概览 ---------- */
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-top: 42px; }
.stat-item { background: #fff; border: 1px solid var(--line); border-radius: 14px; text-align: center; padding: 28px 16px; box-shadow: var(--shadow-sm); }
.stat-item .num { font-size: 38px; font-weight: 700; color: var(--primary); line-height: 1.2; }
.stat-item .num em { font-style: normal; font-size: 20px; margin-left: 2px; }
.stat-item .lab { font-size: 13.5px; color: var(--muted); margin-top: 4px; }

/* ---------- 应用领域 ---------- */
.field-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.field-card { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 26px 24px; transition: all 0.25s; }
.field-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.field-card h3 { font-size: 16.5px; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.field-card h3 .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--primary-light); flex-shrink: 0; }
.field-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- 资质保障 ---------- */
.honor-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.honor-card { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 30px 22px; text-align: center; transition: all 0.25s; }
.honor-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.honor-card .icon {
  width: 54px; height: 54px; margin: 0 auto 14px; border-radius: 50%;
  background: rgba(43, 125, 233, 0.10); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.honor-card h3 { font-size: 15.5px; margin-bottom: 6px; }
.honor-card p { font-size: 13px; color: var(--muted); }

/* ---------- CTA ---------- */
.cta-band {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: 20px; color: #fff; padding: 58px 60px;
  display: flex; align-items: center; justify-content: space-between; gap: 30px;
}
.cta-band h2 { font-size: 28px; margin-bottom: 8px; }
.cta-band p { opacity: 0.85; font-size: 15px; }
.btn-white { background: #fff; color: var(--primary); }
.btn-white:hover { background: #eef4fc; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0b1f3a; color: rgba(255, 255, 255, 0.78); margin-top: 40px; }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 44px; padding: 60px 0 46px; }
.footer-inner h4 { color: #fff; font-size: 15px; margin-bottom: 16px; letter-spacing: 1px; }
.footer-inner p, .footer-inner a { font-size: 13.5px; line-height: 2; }
.footer-inner a:hover { color: #fff; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand .brand-mark { width: 34px; height: 34px; font-size: 15px; }
.footer-brand .t { color: #fff; font-size: 16px; font-weight: 600; letter-spacing: 1px; }
.copyright { border-top: 1px solid rgba(255, 255, 255, 0.1); padding: 20px 0; font-size: 12.5px; text-align: center; }

/* ---------- 登录弹窗 ---------- */
.modal-mask {
  position: fixed; inset: 0; background: rgba(10, 22, 44, 0.5);
  display: none; align-items: center; justify-content: center; z-index: 200;
  backdrop-filter: blur(3px);
}
.modal-mask.show { display: flex; }
.modal-card {
  width: min(420px, 92vw); background: #fff; border-radius: 16px;
  padding: 36px 34px 30px; box-shadow: var(--shadow-md); position: relative;
  animation: pop 0.22s ease;
}
@keyframes pop { from { transform: translateY(14px); opacity: 0; } to { transform: none; opacity: 1; } }
.modal-close {
  position: absolute; top: 14px; right: 16px; background: none; border: none;
  font-size: 22px; color: var(--muted); line-height: 1;
}
.modal-card h3 { font-size: 21px; text-align: center; margin-bottom: 4px; }
.modal-card .sub { text-align: center; color: var(--muted); font-size: 13.5px; margin-bottom: 24px; }
.otp-row { display: flex; gap: 12px; }
.otp-row .form-control { flex: 1; }
.otp-btn {
  white-space: nowrap; padding: 11px 16px; border-radius: 8px;
  border: 1px solid var(--primary); color: var(--primary); background: #fff; font-size: 14px;
}
.otp-btn:hover:not([disabled]) { background: rgba(43, 125, 233, 0.06); }
.divider { display: flex; align-items: center; gap: 14px; margin: 22px 0; color: var(--muted); font-size: 12.5px; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.btn-wechat {
  width: 100%; padding: 12px; border-radius: var(--radius); border: 1px solid #20c46a;
  color: #16a34a; background: #fff; font-size: 15px; display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-wechat:hover { background: rgba(32, 196, 106, 0.06); }
.login-error { color: var(--danger); font-size: 13px; margin-top: 14px; text-align: center; display: none; }
.login-note { color: var(--muted); font-size: 12px; text-align: center; margin-top: 16px; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; top: 86px; left: 50%; transform: translateX(-50%);
  background: #12233f; color: #fff; font-size: 14px;
  padding: 11px 24px; border-radius: 999px; box-shadow: var(--shadow-md);
  z-index: 300; opacity: 0; pointer-events: none; transition: opacity 0.25s, top 0.25s;
}
.toast.show { opacity: 1; top: 96px; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-inner, .about-split { flex-direction: column; }
  .hero-visual { width: 100%; }
  .feature-grid, .product-grid, .value-grid, .field-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row, .honor-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-wrap { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .main-nav { display: none; }
  .hero h1 { font-size: 32px; }
  .page-banner h1 { font-size: 30px; }
  .cta-band { flex-direction: column; text-align: center; padding: 44px 30px; }
}
@media (max-width: 600px) {
  .feature-grid, .product-grid, .value-grid, .form-row, .field-grid, .stats-row, .honor-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
}

/* ---------- FAQ (GEO) ---------- */
.faq-list { max-width: 880px; margin: 0 auto; }
.faq { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 0 20px; margin-bottom: 14px; box-shadow: var(--shadow-sm); }
.faq summary { cursor: pointer; list-style: none; padding: 18px 0; font-weight: 600; font-size: 16px; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 22px; color: var(--primary); transition: transform .2s; }
.faq[open] summary::after { content: "\2212"; }
.faq .a { padding: 0 0 18px; color: var(--muted); line-height: 1.8; }

/* ---------- 纽扣电池详情 ---------- */
.battery-cats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-bottom: 48px; }
.battery-cat {
  background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 28px 28px 24px;
}
.battery-cat h3 { font-size: 17px; margin-bottom: 12px; color: var(--primary); }
.battery-cat p { font-size: 14px; color: var(--muted); margin-bottom: 16px; }
.spec-title { text-align: center; font-size: 20px; margin: 8px 0 26px; letter-spacing: 1px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 640px; }
.spec-table thead { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); color: #fff; }
.spec-table th { padding: 13px 16px; text-align: left; font-weight: 600; white-space: nowrap; }
.spec-table tbody tr { border-top: 1px solid var(--line); }
.spec-table tbody tr:nth-child(even) { background: var(--bg-soft); }
.spec-table td { padding: 12px 16px; color: var(--ink); }
.spec-table td:first-child { font-weight: 600; color: var(--primary); }
.spec-note { font-size: 13px; color: var(--muted); margin: 16px 2px 0; }
.battery-apps { margin-top: 40px; }
.tags-center { justify-content: center; }
@media (max-width: 960px) { .battery-cats { grid-template-columns: 1fr; } }

/* ---------- 语言切换器 ---------- */
.nav-right { display: flex; align-items: center; gap: 24px; }
.lang-switch { display: flex; align-items: center; gap: 4px; font-size: 13px; }
.lang-switch a {
  color: var(--muted); padding: 5px 9px; border-radius: 7px;
  transition: all 0.2s; white-space: nowrap;
}
.lang-switch a:hover { color: var(--primary); background: rgba(43, 125, 233, 0.08); }
.lang-switch a.active { color: #fff; background: var(--primary); font-weight: 600; }
.lang-switch .sep { color: var(--line); }
@media (max-width: 960px) {
  .nav-right { gap: 0; }
  .lang-switch { margin-left: auto; }
}

/* ---------- GEO 增强：要点摘要 / 引用 / 卡片标题 ---------- */
.key-points {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px 28px;
  max-width: 980px;
}
.key-points li {
  position: relative; padding: 16px 18px 16px 20px;
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  line-height: 1.75; font-size: 15px; color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.key-points li::before {
  content: ""; position: absolute; left: 0; top: 14px; bottom: 14px;
  width: 3px; border-radius: 3px; background: var(--primary);
}
.key-points b { color: var(--primary-dark); }
.cite-note {
  max-width: 920px; line-height: 1.9; font-size: 15px; color: var(--muted);
  background: #fff; border: 1px solid var(--line); border-left: 3px solid var(--primary);
  border-radius: 10px; padding: 18px 22px;
}
.cite-note a { color: var(--primary); text-decoration: underline; }
.hero-card .body .card-h {
  font-size: 15px; font-weight: 700; color: #fff; margin: 0 0 10px;
}
@media (max-width: 960px) { .key-points { grid-template-columns: 1fr; } }


/* ================= 品牌 Logo 图片（嘉一知行 · 方案3 正负形咬合矩阵标） ================= */
.brand-logo {
  display: block;
  height: 44px;
  width: auto;
  max-width: 200px;
  object-fit: contain;
  object-position: left center;
}
.brand-logo--footer { height: 34px; max-width: 150px; }
.footer-brand .brand-logo--footer { flex: 0 0 auto; }

@media (max-width: 900px) {
  .brand-logo { height: 38px; }
  .brand-logo--footer { height: 30px; }
}
@media (max-width: 600px) {
  .brand-logo { height: 34px; max-width: 160px; }
  .brand-logo--footer { height: 28px; }
}

/* ===== 产品图片 / 案例配图 ===== */
.product-card .cover { overflow: hidden; }
.product-card .cover img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .35s ease;
}
.product-card:hover .cover img { transform: scale(1.04); }
.case-figure { margin: 8px 0 32px; }
.case-figure img {
  width: 100%; max-width: 880px; height: auto; display: block;
  border-radius: 14px; box-shadow: 0 12px 32px rgba(15, 23, 42, .10);
}
.case-figure figcaption { font-size: 13px; color: var(--muted); margin-top: 10px; }