/* ===== Base ===== */
:root {
  --primary: #0b3a82;
  --primary-dark: #082a5e;
  --accent: #ff8a00;
  --accent-strong: #b35e00; /* 按钮用的加深橙，与白字/白底对比度均≥4.5:1（WCAG AA）*/
  --text: #222;
  --muted: #667085;
  --bg-light: #f5f7fa;
  --border: #e4e7ec;
  --shadow: 0 8px 24px rgba(11, 58, 130, .12);
}

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

body {
  font-family: "Segoe UI", Arial, "Helvetica Neue", sans-serif;
  color: var(--text);
  line-height: 1.6;
}

img { max-width: 100%; display: block; border-radius: 6px; }
a { color: var(--primary); text-decoration: none; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section-title { font-size: 32px; text-align: center; margin-bottom: 12px; color: var(--primary-dark); }
.section-sub { text-align: center; color: var(--muted); margin-bottom: 40px; max-width: 720px; margin-left: auto; margin-right: auto; }
.bg-light { background: var(--bg-light); }

.btn {
  display: inline-block; padding: 12px 28px; border-radius: 6px;
  font-weight: 600; border: none; cursor: pointer;
  transition: transform .2s, box-shadow .2s, opacity .2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-accent { background: var(--accent-strong); color: #fff; }
.btn-outline { background: transparent; color: #fff; border: 2px solid #fff; }
.btn-block { width: 100%; }

/* ===== Scroll reveal ===== */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ===== Header ===== */
.site-header {
  background: #fff; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  transition: box-shadow .25s;
}
.site-header.scrolled { box-shadow: 0 4px 16px rgba(0,0,0,.08); }
.header-inner { display: flex; align-items: center; gap: 24px; height: 76px; }
.logo img { border-radius: 4px; }
.main-nav { flex: 1; }
.main-nav > ul { display: flex; gap: 2px; }
.main-nav > ul > li { position: relative; }
.main-nav > ul > li > a {
  display: block; padding: 26px 14px; font-size: 15px; font-weight: 500;
  color: var(--text); position: relative;
}
.main-nav > ul > li > a::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 18px;
  height: 2px; background: var(--accent); transform: scaleX(0);
  transform-origin: left; transition: transform .25s;
}
.main-nav > ul > li:hover > a { color: var(--primary); }
.main-nav > ul > li:hover > a::after { transform: scaleX(1); }
.caret { font-size: 10px; opacity: .55; }

/* Dropdown */
.dropdown {
  position: absolute; top: 100%; left: 0; min-width: 220px;
  background: #fff; border: 1px solid var(--border); border-radius: 0 0 10px 10px;
  box-shadow: var(--shadow); padding: 10px 0;
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .25s, transform .25s, visibility .25s;
  z-index: 50;
}
.has-dropdown:hover > .dropdown {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.dropdown a {
  display: block; padding: 9px 22px; font-size: 14px; color: var(--text);
  transition: background .15s, color .15s, padding-left .15s;
}
.dropdown a:hover {
  background: var(--bg-light); color: var(--primary); padding-left: 28px;
}
.dropdown-wide {
  min-width: 480px; display: grid; grid-template-columns: 1fr 1fr;
}
.nav-toggle { display: none; font-size: 24px; background: none; border: none; cursor: pointer; }

/* ===== Breadcrumb / page hero ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff; padding: 56px 0;
}
.page-hero h1 { font-size: 36px; margin-bottom: 8px; }
.breadcrumb { font-size: 14px; color: #b9c8e2; }
.breadcrumb a { color: #d6e0f0; }
.breadcrumb a:hover { color: #fff; }

/* ===== Home hero carousel ===== */
.hero-carousel { position: relative; overflow: hidden; color: #fff; }
.carousel-track {
  display: flex; transition: transform .6s cubic-bezier(.4,0,.2,1);
}
.hero-slide {
  min-width: 100%;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  padding: 96px 0;
}
.hero-slide:nth-child(2) { background: linear-gradient(135deg, #1a2940, #2c4a7c); }
.hero-slide:nth-child(3) { background: linear-gradient(135deg, #143d5c, #1a6c8f); }
.hero-slide .hero-inner { display: flex; gap: 48px; align-items: center; }
.hero-text { flex: 1; }
.hero-text h1, .hero-text h2 { font-size: 42px; line-height: 1.2; margin-bottom: 20px; }
.hero-text p { margin-bottom: 28px; color: #d6e0f0; max-width: 540px; }
.hero-img { flex: 1; }
.carousel-prev, .carousel-next {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 46px; height: 46px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(255,255,255,.18); color: #fff; font-size: 20px;
  transition: background .2s; z-index: 5;
}
.carousel-prev:hover, .carousel-next:hover { background: rgba(255,255,255,.38); }
.carousel-prev { left: 18px; }
.carousel-next { right: 18px; }
.carousel-dots {
  position: absolute; bottom: 22px; left: 0; right: 0;
  display: flex; justify-content: center; gap: 10px; z-index: 5;
}
.carousel-dots button {
  width: 11px; height: 11px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(255,255,255,.4); transition: background .2s, transform .2s;
}
.carousel-dots button.active { background: #fff; transform: scale(1.25); }

/* ===== Grids & cards ===== */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--border); border-radius: 10px;
  padding: 16px; transition: box-shadow .25s, transform .25s;
  overflow: hidden;
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-5px); }
.card .card-img { overflow: hidden; border-radius: 6px; }
.card .card-img img { transition: transform .45s ease; }
.card:hover .card-img img { transform: scale(1.07); }
.card h3 { margin: 14px 0 6px; font-size: 18px; color: var(--primary-dark); }
.card p { font-size: 14px; color: var(--muted); margin-bottom: 10px; }
.link-more { font-weight: 600; font-size: 14px; }
.link-more::after { content: " →"; transition: margin-left .2s; }
.link-more:hover::after { margin-left: 5px; }

/* Product listing card */
.product-card { text-align: center; }
.product-card .model { font-size: 13px; color: var(--muted); }

/* ===== Metrics / stats ===== */
.metric { text-align: center; }
.metric strong { display: block; font-size: 34px; color: var(--primary); margin-top: 14px; }
.metric span { color: var(--muted); font-size: 14px; }

.stats-band {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff; padding: 56px 0;
}
.stats-band .grid { text-align: center; }
.stats-band strong { display: block; font-size: 40px; }
.stats-band span { color: #b9c8e2; font-size: 14px; }

/* ===== Split (image + text) blocks ===== */
.split { display: flex; align-items: center; gap: 48px; margin-bottom: 56px; }
.split.reverse { flex-direction: row-reverse; }
.split-text { flex: 1; }
.split-text h3 { font-size: 26px; color: var(--primary-dark); margin-bottom: 10px; }
.split-text p { color: var(--muted); }
.split img { flex: 1; max-width: 520px; }

.test-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 16px; }
.test-list li {
  background: #fff; border: 1px solid var(--border); border-radius: 6px;
  padding: 8px 12px; font-size: 13px; color: var(--muted);
}

/* ===== FAQ accordion ===== */
.faq details {
  border: 1px solid var(--border); border-radius: 8px;
  margin-bottom: 14px; padding: 18px 22px; background: #fff;
  transition: box-shadow .2s;
}
.faq details:hover { box-shadow: var(--shadow); }
.faq summary {
  font-weight: 600; cursor: pointer; color: var(--primary-dark);
  list-style: none; position: relative; padding-right: 28px;
}
.faq summary::after {
  content: "+"; position: absolute; right: 0; top: 0;
  font-size: 20px; color: var(--accent); transition: transform .25s;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin-top: 10px; color: var(--muted); }

/* ===== Tabs ===== */
.tab-bar { display: flex; gap: 6px; border-bottom: 2px solid var(--border); margin-bottom: 24px; }
.tab-btn {
  padding: 12px 26px; border: none; background: none; cursor: pointer;
  font-size: 15px; font-weight: 600; color: var(--muted);
  border-bottom: 3px solid transparent; margin-bottom: -2px;
  transition: color .2s, border-color .2s;
}
.tab-btn.active, .tab-btn:hover { color: var(--primary); border-bottom-color: var(--accent); }
.tab-panel { display: none; animation: fadeIn .35s ease; }
.tab-panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ===== Product detail ===== */
.product-layout { display: flex; gap: 48px; align-items: flex-start; }
.product-gallery { flex: 1; max-width: 520px; }
.gallery-main img { width: 100%; transition: opacity .2s; border: 1px solid var(--border); }
.gallery-thumbs { display: flex; gap: 10px; margin-top: 12px; }
.gallery-thumbs img {
  width: 90px; cursor: pointer; border: 2px solid transparent;
  transition: border-color .2s, transform .2s;
}
.gallery-thumbs img:hover { transform: translateY(-3px); }
.gallery-thumbs img.active { border-color: var(--accent); }
.product-info { flex: 1; }
.product-info h1 { font-size: 30px; color: var(--primary-dark); margin-bottom: 14px; }
.price-box {
  background: var(--bg-light); border-radius: 8px; padding: 18px 22px; margin: 18px 0;
  font-size: 14px;
}
.price-box div { display: flex; justify-content: space-between; padding: 5px 0; }
.price-box dt, .price-box .label { color: var(--muted); }
.product-info .btn { margin-right: 12px; margin-top: 10px; }

.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table th, .spec-table td { border: 1px solid var(--border); padding: 11px 16px; text-align: left; }
.spec-table th { background: var(--bg-light); color: var(--primary-dark); width: 220px; }
.spec-table tr { transition: background .15s; }
.spec-table tbody tr:hover { background: #fafbfd; }

/* ===== Timeline (about page) ===== */
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 32px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 0; bottom: 0;
  width: 3px; background: var(--border);
}
.timeline-item { position: relative; padding-bottom: 36px; }
.timeline-item::before {
  content: ""; position: absolute; left: -31px; top: 6px;
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--accent); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--accent);
}
.timeline-item h4 { color: var(--primary); font-size: 18px; }
.timeline-item p { color: var(--muted); font-size: 14px; }

/* ===== Blog ===== */
.blog-card .meta { font-size: 13px; color: var(--muted); margin-bottom: 6px; }

/* ===== Contact page ===== */
.contact-layout { display: flex; gap: 48px; align-items: flex-start; }
.contact-form-card {
  flex: 1.4; background: #fff; border: 1px solid var(--border);
  border-radius: 12px; padding: 36px; box-shadow: var(--shadow);
}
.contact-aside { flex: 1; }
.contact-aside .info-item { display: flex; gap: 14px; margin-bottom: 22px; }
.contact-aside .info-icon {
  width: 46px; height: 46px; flex: none; border-radius: 10px;
  background: var(--bg-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center; font-size: 20px;
}
.form-row { display: flex; gap: 14px; }
.form-row > * { flex: 1; }
.contact-form-card input, .contact-form-card textarea,
.modal input, .modal textarea {
  width: 100%; padding: 12px 14px; margin-bottom: 14px;
  border: 1px solid var(--border); border-radius: 6px;
  font-family: inherit; font-size: 14px;
  transition: border-color .2s, box-shadow .2s;
}
.contact-form-card input:focus, .contact-form-card textarea:focus,
.modal input:focus, .modal textarea:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(11,58,130,.12);
}
.map-placeholder {
  margin-top: 24px; border-radius: 12px; overflow: hidden;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(8,42,94,.55);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transition: opacity .3s, visibility .3s;
  z-index: 200; padding: 20px;
}
.modal-overlay.show { opacity: 1; visibility: visible; }
.modal {
  background: #fff; border-radius: 14px; padding: 36px;
  width: 100%; max-width: 560px; position: relative;
  transform: translateY(24px) scale(.97); transition: transform .3s;
  max-height: 90vh; overflow-y: auto;
}
.modal-overlay.show .modal { transform: none; }
.modal h3 { color: var(--primary-dark); font-size: 24px; margin-bottom: 6px; }
.modal-sub { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.modal-close {
  position: absolute; top: 14px; right: 18px; border: none; background: none;
  font-size: 26px; cursor: pointer; color: var(--muted); transition: color .2s, transform .2s;
}
.modal-close:hover { color: var(--text); transform: rotate(90deg); }
.file-label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.file-label input { margin-top: 6px; border: none; padding: 0; }

/* ===== CTA band ===== */
.cta-band {
  background: linear-gradient(135deg, var(--accent), #ff6a00);
  color: #fff; text-align: center; padding: 64px 0;
}
.cta-band h2 { font-size: 30px; margin-bottom: 12px; }
.cta-band p { margin-bottom: 24px; opacity: .9; }
.cta-band .btn { background: #fff; color: var(--accent-strong); }

/* ===== Footer ===== */
.site-footer { background: var(--primary-dark); color: #c8d4e8; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; padding: 64px 20px; }
.footer-col h4 { color: #fff; margin-bottom: 16px; }
.footer-col a { color: #c8d4e8; font-size: 14px; transition: color .2s, padding-left .2s; }
.footer-col a:hover { color: #fff; padding-left: 4px; }
.footer-col li { margin-bottom: 8px; }
.footer-col p { font-size: 14px; margin-bottom: 12px; }
.footer-logo { margin-bottom: 16px; }
.social { display: flex; gap: 10px; }
.social a {
  width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,.12);
  display: flex; align-items: center; justify-content: center; font-weight: 700; color: #fff;
  transition: background .2s, transform .2s;
}
.social a:hover { background: var(--accent); transform: translateY(-3px); }
.quote-form input, .quote-form textarea {
  width: 100%; padding: 10px 12px; margin-bottom: 10px; border-radius: 6px;
  border: none; font-family: inherit; font-size: 14px;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.15);
  padding: 18px 0; font-size: 13px; text-align: center;
}

/* ===== Back to top ===== */
.back-top {
  position: fixed; right: 26px; bottom: 26px; width: 46px; height: 46px;
  border-radius: 50%; border: none; cursor: pointer;
  background: var(--primary); color: #fff; font-size: 18px;
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .3s, transform .3s, visibility .3s, background .2s;
  z-index: 150;
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { background: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-slide .hero-inner, .product-layout, .contact-layout { flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .header-cta { display: none; }
  .nav-toggle { display: block; margin-left: auto; }

  .main-nav {
    display: none; position: absolute; top: 76px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    padding: 12px 20px; max-height: calc(100vh - 76px); overflow-y: auto;
  }
  .main-nav.open { display: block; }
  .main-nav > ul { flex-direction: column; }
  .main-nav > ul > li > a { padding: 12px 4px; }
  .main-nav > ul > li > a::after { display: none; }
  .dropdown, .dropdown-wide {
    position: static; display: none; opacity: 1; visibility: visible;
    transform: none; box-shadow: none; border: none;
    grid-template-columns: 1fr; padding: 0 0 0 16px;
  }
  .submenu-open > .dropdown { display: block; }
}
@media (max-width: 600px) {
  .grid-4, .grid-3, .grid-2, .footer-grid { grid-template-columns: 1fr; }
  .hero-text h1, .hero-text h2 { font-size: 28px; }
  .split, .split.reverse { flex-direction: column; }
  .test-list { grid-template-columns: 1fr 1fr; }
  .form-row { flex-direction: column; gap: 0; }
  .carousel-prev, .carousel-next { display: none; }
}

/* ===== WhatsApp 悬浮按钮 ===== */
.wa-float {
  position: fixed; right: 26px; bottom: 84px; width: 52px; height: 52px;
  border-radius: 50%; background: #25d366; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,.25); z-index: 150; transition: transform .2s;
}
.wa-float:hover { transform: scale(1.08); }
[dir="rtl"] .wa-float { right: auto; left: 26px; }

/* ===== Cookie consent bar ===== */
.cookie-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 300;
  background: var(--primary-dark); color: #e6ecf6;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: 14px 22px; padding: 14px 22px; font-size: 14px;
  box-shadow: 0 -4px 20px rgba(0,0,0,.2);
}
.cookie-bar a { color: #fff; text-decoration: underline; }
.cookie-actions { display: flex; gap: 10px; }
.cookie-bar .btn { padding: 8px 20px; font-size: 13px; }
.cookie-bar .btn-ghost { background: rgba(255,255,255,.15); color: #fff; }

/* ===== 404 page ===== */
.error-page { text-align: center; padding: 100px 20px; }
.error-page .code { font-size: 90px; font-weight: 800; color: var(--primary); line-height: 1; }
.error-page h1 { font-size: 26px; color: var(--primary-dark); margin: 14px 0 10px; }
.error-page p { color: var(--muted); margin-bottom: 26px; }

/* ===== Legal pages ===== */
.legal-body { max-width: 820px; margin: 0 auto; }
.legal-body h2 { color: var(--primary-dark); font-size: 20px; margin: 28px 0 10px; }
.legal-body p, .legal-body li { color: #444; line-height: 1.9; }
.legal-body ul { padding-left: 22px; margin-bottom: 14px; list-style: disc; }

/* ===== Product filter chips ===== */
.product-filter { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.filter-chip {
  border: 1px solid var(--border); background: #fff; border-radius: 20px;
  padding: 8px 20px; font-size: 14px; color: #444; transition: all .2s;
}
.filter-chip:hover { border-color: var(--primary); color: var(--primary); }
.filter-chip.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.logo-text { font-size: 22px; font-weight: 800; color: var(--primary); letter-spacing: .5px; }
.footer-logo-text { color: #fff; display: inline-block; margin-bottom: 16px; }

/* ===== Language switcher ===== */
.lang-switch { position: relative; }
.lang-btn {
  display: flex; align-items: center; gap: 6px;
  background: none; border: 1px solid var(--border); border-radius: 6px;
  padding: 9px 14px; font-size: 14px; cursor: pointer; color: var(--text);
  transition: border-color .2s, color .2s; white-space: nowrap;
}
.lang-btn:hover { border-color: var(--primary); color: var(--primary); }
.lang-switch .dropdown { left: auto; right: 0; min-width: 150px; border-radius: 10px; }
.lang-switch:hover > .dropdown,
.lang-switch.open > .dropdown { opacity: 1; visibility: visible; transform: none; }
.lang-menu a.active { color: var(--primary); font-weight: 700; background: var(--bg-light); }

/* ===== RTL (Arabic) ===== */
[dir="rtl"] .dropdown { left: auto; right: 0; }
[dir="rtl"] .lang-switch .dropdown { right: auto; left: 0; }
[dir="rtl"] .back-top { right: auto; left: 26px; }
[dir="rtl"] .product-info .btn { margin-right: 0; margin-left: 12px; }

@media (max-width: 992px) {
  .lang-switch { margin-left: auto; }
  .nav-toggle { margin-left: 0; }
}