:root {
  --navy: #0F2B4C;
  --navy-soft: #1E3A8A;
  --amber: #C2410C;
  --amber-hover: #9A3412;
  --charcoal: #1F2937;
  --ink: #374151;
  --muted: #6B7280;
  --bg: #FBF9F6;
  --bg-alt: #F3EFE9;
  --line: #E5E0D8;
  --white: #FFFFFF;
  --radius: 10px;
  --maxw: 1240px;
  --space: clamp(48px, 7vw, 88px);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 0;
}
img { display: block; max-width: 100%; height: auto; object-fit: cover; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
h1, h2, h3 { color: var(--navy); line-height: 1.25; font-weight: 700; }
h1 { font-size: clamp(28px, 4.2vw, 44px); letter-spacing: -0.5px; }
h2 { font-size: clamp(22px, 3vw, 32px); }
h3 { font-size: 18px; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--space) 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--navy); color: #fff; padding: 10px 16px; border-radius: 0 0 6px 0;
}
.skip-link:focus { left: 0; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* 头部 */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(251, 249, 246, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 15px; color: var(--navy); }
.brand-text strong { font-size: 17px; letter-spacing: 0.5px; }
.brand svg { flex: none; }

.site-nav ul { display: flex; gap: 6px; align-items: center; }
.site-nav a {
  display: inline-block; padding: 8px 12px; border-radius: 6px;
  font-size: 14.5px; color: var(--ink); transition: color .15s, background .15s;
}
.site-nav a:hover, .site-nav a:focus-visible { color: var(--amber); background: rgba(194, 65, 12, 0.07); }
.menu-toggle {
  display: none; background: none; border: 1px solid var(--line); border-radius: 6px;
  padding: 8px; color: var(--navy); cursor: pointer;
}

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 24px; border-radius: 8px; font-size: 15.5px; font-weight: 600;
  border: 1.5px solid transparent; cursor: pointer; transition: all .18s ease;
  font-family: inherit; text-align: center; line-height: 1.3;
}
.btn-primary { background: var(--amber); color: #fff; border-color: var(--amber); }
.btn-primary:hover, .btn-primary:focus-visible { background: var(--amber-hover); border-color: var(--amber-hover); }
.btn-ghost { background: transparent; color: var(--navy); border-color: var(--line); }
.btn-ghost:hover, .btn-ghost:focus-visible { border-color: var(--navy); background: #fff; }
.btn-outline-light { background: transparent; color: #fff; border-color: rgba(255,255,255,0.45); }
.btn-outline-light:hover, .btn-outline-light:focus-visible { border-color: #fff; background: rgba(255,255,255,0.1); }
.btn-lg { padding: 15px 34px; font-size: 18px; }
.btn:focus-visible { outline: 3px solid rgba(194, 65, 12, 0.35); outline-offset: 2px; }

/* 首屏 */
.hero { padding: clamp(36px, 5vw, 56px) 0 clamp(48px, 7vw, 80px); }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 4vw, 56px); align-items: center; }
.hero-copy .eyebrow {
  display: inline-block; font-size: 13px; letter-spacing: 1px; color: var(--amber);
  font-weight: 600; margin-bottom: 14px; text-transform: uppercase;
}
.hero-lead { margin: 18px 0 26px; font-size: 17px; max-width: 52ch; color: var(--ink); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-note { margin-top: 18px; font-size: 14px; color: var(--muted); }
.hero-media {
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line);
  box-shadow: 0 18px 40px -24px rgba(15, 43, 76, 0.35);
}
.hero-media img { width: 100%; height: clamp(300px, 44vw, 480px); }

/* 节标题 */
.section-head { max-width: 760px; margin-bottom: 40px; }
.section-num { font-size: 13px; letter-spacing: 2px; color: var(--amber); font-weight: 600; margin-bottom: 10px; }
.section-num-light { color: #FDBA74; }
.section-desc { margin-top: 14px; color: var(--muted); font-size: 16px; }
.section-foot { margin-top: 24px; font-size: 14px; color: var(--muted); }

/* 产品卡片 */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; transition: box-shadow .2s, transform .2s;
}
.card:hover { box-shadow: 0 16px 32px -20px rgba(15, 43, 76, 0.3); transform: translateY(-2px); }
.card-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%;
  background: rgba(194, 65, 12, 0.1); color: var(--amber);
  font-weight: 700; font-size: 15px; margin-bottom: 16px;
}
.card p { margin-top: 8px; font-size: 15px; color: var(--ink); }

/* 关于 */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(32px, 5vw, 64px); align-items: center; }
.about-copy p { margin: 16px 0; font-size: 16px; }
.about-actions { margin-top: 26px; }
.about-media { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.about-media figure { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: #fff; }
.about-media img { width: 100%; height: 200px; }
.about-media figcaption { padding: 10px 12px; font-size: 13px; color: var(--muted); text-align: center; }

/* 流程 */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 56px; }
.steps li {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 20px; position: relative;
}
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--navy); color: #fff; font-size: 14px; font-weight: 700; margin-bottom: 14px;
}
.steps h3 { font-size: 16px; margin-bottom: 6px; }
.steps p { font-size: 14px; color: var(--muted); }

/* FAQ */
.faq { max-width: 820px; }
.faq h3 { margin-bottom: 16px; font-size: 20px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer; padding: 16px 0; font-weight: 600; color: var(--navy);
  list-style: none; position: relative; padding-right: 32px; font-size: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font-size: 20px; color: var(--amber); font-weight: 400;
}
.faq details[open] summary::after { content: "−"; }
.faq details p { padding: 0 0 18px; color: var(--ink); font-size: 15px; max-width: 68ch; }

/* 区域 */
.regions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.region-group h3 { font-size: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--navy); margin-bottom: 14px; }
.region-group ul { display: flex; flex-wrap: wrap; gap: 8px; }
.region-group a {
  display: inline-block; padding: 6px 13px; border: 1px solid var(--line);
  border-radius: 6px; font-size: 14px; color: var(--ink); background: var(--white);
  transition: all .15s;
}
.region-group a:hover, .region-group a:focus-visible { border-color: var(--amber); color: var(--amber); background: rgba(194,65,12,0.05); }

/* 联系 */
.contact { background: var(--navy); color: #E5E7EB; padding: var(--space) 0; }
.contact-inner { max-width: 680px; }
.contact h2 { color: #fff; }
.contact > .container > p { margin-top: 14px; font-size: 16px; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }
.copy-feedback { margin-top: 14px; font-size: 14px; color: #FDBA74; min-height: 22px; }

/* 页脚 */
.site-footer { background: #0B1F38; color: #9CA3AF; padding: 40px 0 36px; font-size: 14px; }
.footer-inner { display: grid; gap: 10px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 600; font-size: 16px; }
.footer-inner a { color: #FDBA74; }
.footer-inner a:hover { text-decoration: underline; }
.footer-small { font-size: 13px; color: #9CA3AF; }

/* 手机底栏 */
.mobile-bar {
  display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
  background: var(--amber); padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  box-shadow: 0 -6px 20px rgba(15, 43, 76, 0.25);
}
.mobile-bar-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  color: #fff; font-weight: 700; font-size: 16px;
}

/* 响应式 */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-media { order: -1; }
  .hero-media img { height: 300px; }
  .card-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .regions { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .menu-toggle { display: inline-flex; }
  .site-nav {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    display: none; padding: 10px 24px 18px;
    max-height: calc(100dvh - 64px - 64px - env(safe-area-inset-bottom));
    overflow-y: auto;
  }
  .site-nav.is-open { display: block; }
  .site-nav ul { flex-direction: column; align-items: stretch; gap: 2px; }
  .site-nav a { display: block; padding: 12px 8px; border-radius: 6px; }
  .mobile-bar { display: block; }
  body { padding-bottom: 86px; }
}

@media (max-width: 600px) {
  .steps { grid-template-columns: 1fr; }
  .regions { grid-template-columns: 1fr; }
  .about-media { grid-template-columns: 1fr; }
  .about-media img { height: 180px; }
  .hero-actions .btn { width: 100%; }
  .contact-actions .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}