:root {
  --navy: #0a2540;
  --navy-2: #103a5e;
  --blue: #1a6fc4;
  --accent: #ff6b35;
  --accent-dark: #e85520;
  --ink: #1d2733;
  --muted: #6b7785;
  --line: #e6ebf1;
  --bg-soft: #f4f7fb;
  --white: #ffffff;
  --shadow: 0 10px 30px rgba(10, 37, 64, 0.08);
  --radius: 14px;
  --container: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  line-height: 1.65;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.btn {
  display: inline-block; padding: 13px 28px; border-radius: 999px; font-weight: 600;
  font-size: 15px; cursor: pointer; border: none; transition: all .2s ease; text-align: center;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(255,107,53,.3); }
.btn-ghost { background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.5); }
.btn-ghost:hover { background: rgba(255,255,255,.22); }
.btn-block { width: 100%; }

/* 顶部条 */
.topbar { background: var(--navy); color: #cdd9e6; font-size: 13px; }
.topbar-inner { display: flex; justify-content: space-between; align-items: center; height: 40px; }
.topbar-left span { margin-right: 20px; }
.topbar a { color: #cdd9e6; }
.topbar a:hover { color: #fff; }
.lang-switch { display: inline-flex; align-items: center; gap: 6px; }
.lang-btn { background: none; border: none; color: #9fb2c6; cursor: pointer; font-size: 13px; font-weight: 600; padding: 2px 4px; }
.lang-btn.active { color: #fff; }
.lang-switch .divider { color: #43586e; }

/* 导航 */
.header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.95); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark { width: 44px; height: 44px; border-radius: 10px; object-fit: contain; display: block; }
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-text strong { font-size: 17px; color: var(--navy); }
.logo-text em { font-style: normal; font-size: 11px; color: var(--muted); letter-spacing: .3px; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--ink); transition: color .2s; }
.nav-links a:hover { color: var(--accent); }
.nav-cta { background: var(--accent); color: #fff !important; padding: 9px 20px; border-radius: 999px; }
.nav-cta:hover { background: var(--accent-dark); }
.menu-toggle { display: none; background: none; border: none; font-size: 26px; color: var(--navy); cursor: pointer; }

/* Hero */
.hero { position: relative; color: #fff; overflow: hidden; }
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(1100px 500px at 80% -10%, rgba(26,111,196,.55), transparent 60%),
    linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%);
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0; opacity: .15;
  background-image: radial-gradient(rgba(255,255,255,.6) 1px, transparent 1px);
  background-size: 26px 26px;
}
.hero-inner { position: relative; padding: 110px 24px 120px; max-width: var(--container); margin: 0 auto; }
.hero-text { max-width: 720px; }
.badge { display: inline-block; background: rgba(255,107,53,.18); color: #ffd0bc; border: 1px solid rgba(255,107,53,.4); padding: 6px 16px; border-radius: 999px; font-size: 13px; font-weight: 600; margin-bottom: 22px; }
.hero h1 { font-size: 46px; line-height: 1.15; font-weight: 800; letter-spacing: -.5px; }
.hero p { font-size: 18px; color: #d6e2f0; margin: 20px 0 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 44px; margin-top: 54px; flex-wrap: wrap; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 34px; font-weight: 800; color: #fff; }
.hero-stats span { font-size: 14px; color: #9fb2c6; }

/* 通用 section */
.section { padding: 90px 0; }
.section-alt { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.section-head.left { text-align: left; margin: 0 0 28px; }
.section-head h2 { font-size: 34px; font-weight: 800; color: var(--navy); }
.section-head p { color: var(--muted); margin-top: 12px; font-size: 16px; }

/* 产品 */
.filter-bar { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 40px; }
.filter-btn { border: 1px solid var(--line); background: #fff; padding: 9px 20px; border-radius: 999px; cursor: pointer; font-size: 14px; font-weight: 500; color: var(--muted); transition: all .2s; }
.filter-btn:hover { border-color: var(--blue); color: var(--blue); }
.filter-btn.active { background: var(--navy); color: #fff; border-color: var(--navy); }
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 26px; }
.product-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform .25s, box-shadow .25s; display: flex; flex-direction: column; }
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.product-thumb { height: 200px; position: relative; background: #eef2f6; overflow: hidden; }
.product-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .4s ease; }
.product-card:hover .product-thumb img { transform: scale(1.05); }
.product-thumb span.cat-tag { position: absolute; top: 12px; left: 12px; background: rgba(10,37,64,.72); color: #fff; font-size: 12px; padding: 4px 12px; border-radius: 999px; font-weight: 600; }
.product-body { padding: 18px 20px 22px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.product-body h3 { font-size: 17px; color: var(--navy); }
.product-body .desc { font-size: 14px; color: var(--muted); flex: 1; }
.product-body .meta { font-size: 13px; color: var(--accent); font-weight: 600; }
.detail-link { align-self: flex-start; margin-top: 4px; background: none; border: none; color: var(--blue); font-size: 14px; font-weight: 600; cursor: pointer; padding: 0; }
.detail-link:hover { color: var(--accent); text-decoration: underline; }
.product-card { cursor: pointer; }

/* 产品卡片内展开详情 */
.product-card.open { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--blue); }
.product-detail { display: none; padding: 0 20px 22px; flex-direction: column; gap: 16px; }
.product-card.open .product-detail { display: flex; animation: pdIn .2s ease; }
@keyframes pdIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }
.pd-desc { color: var(--muted); font-size: 14px; line-height: 1.7; }
.pd-specs { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.pd-specs .spec-row { display: flex; justify-content: space-between; gap: 16px; padding: 11px 14px; background: #fff; font-size: 13.5px; }
.pd-specs .spec-k { color: var(--muted); font-weight: 500; }
.pd-specs .spec-v { color: var(--ink); font-weight: 600; text-align: right; }
.pd-cta { align-self: flex-start; padding: 10px 22px; font-size: 14px; }

/* 关于 */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 50px; align-items: center; }
.about-text p { color: var(--muted); margin-bottom: 16px; }
.check-list { list-style: none; margin-top: 20px; display: grid; gap: 12px; }
.check-list li { padding-left: 30px; position: relative; color: var(--ink); font-weight: 500; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; width: 20px; height: 20px; background: var(--accent); color: #fff; border-radius: 50%; display: grid; place-items: center; font-size: 12px; font-weight: 700; }
.about-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.info-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; text-align: center; box-shadow: var(--shadow); }
.info-num { display: block; font-size: 34px; font-weight: 800; color: var(--blue); }
.info-card span:last-child { color: var(--muted); font-size: 14px; }

/* 优势 */
.adv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 26px; }
.adv-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 26px; transition: transform .25s, box-shadow .25s; }
.adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.adv-icon { font-size: 38px; margin-bottom: 16px; }
.adv-card h3 { font-size: 19px; color: var(--navy); margin-bottom: 10px; }
.adv-card p { color: var(--muted); font-size: 15px; }

/* 合作流程 */
.process-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 26px; }
.process-step { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 36px 26px 30px; text-align: center; transition: transform .25s, box-shadow .25s; }
.process-step:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.process-step .step-no { width: 58px; height: 58px; margin: 0 auto 18px; border-radius: 50%; background: linear-gradient(135deg, var(--blue), var(--navy)); color: #fff; display: grid; place-items: center; font-size: 22px; font-weight: 800; box-shadow: 0 8px 20px rgba(26,111,196,.28); }
.process-step h3 { font-size: 18px; color: var(--navy); margin-bottom: 10px; }
.process-step p { color: var(--muted); font-size: 14.5px; }

/* 询盘 */
.inquiry-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 50px; align-items: start; }
.contact-list { list-style: none; display: grid; gap: 16px; margin-top: 8px; }
.contact-list li { display: flex; align-items: center; gap: 12px; font-size: 15px; color: var(--ink); }
.contact-list span { font-size: 20px; }
.contact-list a { color: var(--blue); }
.inquiry-form { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { margin-bottom: 18px; display: flex; flex-direction: column; }
.field label { font-size: 14px; font-weight: 600; margin-bottom: 7px; color: var(--navy); }
.field input, .field select, .field textarea {
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; font-size: 15px;
  font-family: inherit; color: var(--ink); background: #fff; transition: border-color .2s, box-shadow .2s; width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(26,111,196,.12); }
.field textarea { resize: vertical; }
.form-note { font-size: 12px; color: var(--muted); margin-top: 12px; text-align: center; }
.form-success { margin-top: 18px; background: #e8f7ee; border: 1px solid #b6e3c8; color: #1c7a45; border-radius: 10px; padding: 16px; text-align: center; display: flex; flex-direction: column; gap: 4px; }
.form-success strong { font-size: 16px; }

/* 页脚 */
.footer { background: var(--navy); color: #cdd9e6; padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 40px; padding-bottom: 36px; }
.footer .logo-text strong { color: #fff; }
.footer .logo-mark { background: #fff; padding: 4px; }
.footer .logo-text em { color: #8fa6bd; }
.footer-desc { margin-top: 16px; font-size: 14px; max-width: 320px; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer a, .footer p { display: block; color: #9fb2c6; font-size: 14px; margin-bottom: 10px; }
.footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 18px 0; text-align: center; font-size: 13px; color: #7d93aa; }

/* 响应式 */
@media (max-width: 900px) {
  .about-grid, .inquiry-grid { grid-template-columns: 1fr; gap: 36px; }
  .nav-links { position: fixed; top: 110px; left: 0; right: 0; background: #fff; flex-direction: column; gap: 0; padding: 10px 24px 20px; border-bottom: 1px solid var(--line); transform: translateY(-150%); transition: transform .3s; box-shadow: var(--shadow); }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 12px 0; width: 100%; border-bottom: 1px solid var(--line); }
  .menu-toggle { display: block; }
  .hero h1 { font-size: 34px; }
  .hero-stats { gap: 28px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 560px) {
  .field-row { grid-template-columns: 1fr; }
  .about-cards { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
}