:root {
  --brand: #23503A;
  --brand-dark: #163629;
  --brand-light: #2f6b4d;
  --gold: #c9a24b;
  --gold-dark: #a67c2a;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.16);
  --maxw: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
}

.brand-logo { width: 42px; height: 42px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-links a {
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--brand); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: 0.3s;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand) 55%, var(--brand-light) 100%);
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.18), transparent 40%),
    radial-gradient(circle at 80% 0%, rgba(255, 255, 255, 0.12), transparent 45%);
}

.hero-inner {
  padding: 84px 24px 120px;
  text-align: center;
}

.hero-badge {
  width: 132px;
  height: 132px;
  margin: 0 auto 26px;
  filter: drop-shadow(0 8px 24px rgba(2, 6, 23, 0.28));
}

.hero-eyebrow {
  letter-spacing: 4px;
  font-size: 13px;
  opacity: 0.85;
  margin: 0 0 18px;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.25;
  margin: 0 0 20px;
  font-weight: 800;
}

.hero-subtitle {
  max-width: 640px;
  margin: 0 auto 34px;
  font-size: 17px;
  opacity: 0.92;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: #fff;
  color: var(--brand-dark);
  box-shadow: var(--shadow);
}

.btn-primary:hover { box-shadow: var(--shadow-lg); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-ghost:hover { background: rgba(255, 255, 255, 0.22); }

/* ---------- 通用 section ---------- */
.section { padding: 88px 0; }

.section-alt { background: var(--bg-alt); }

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  color: var(--gold-dark);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(26px, 4vw, 38px);
  margin: 0 0 14px;
  font-weight: 800;
}

.section-desc {
  color: var(--muted);
  margin: 0;
  font-size: 16px;
}

/* ---------- 公司简介 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.about-text p { color: #334155; margin: 0 0 18px; }

.stats {
  display: flex;
  gap: 34px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.stat strong {
  display: block;
  font-size: 32px;
  color: var(--brand);
  font-weight: 800;
}

.stat span { color: var(--muted); font-size: 14px; }

.about-media img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
}

/* ---------- 业务卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 24px;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--gold));
  margin-bottom: 18px;
}

.card h3 { margin: 0 0 10px; font-size: 18px; }

.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* ---------- 产品画廊 ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.gallery-item {
  position: relative;
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: zoom-in;
  aspect-ratio: 4 / 3;
  background: var(--bg-alt);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

.gallery-item:hover img { transform: scale(1.06); }

.gallery-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px;
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  background: linear-gradient(transparent, rgba(15, 23, 42, 0.72));
}

/* ---------- 联系 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.contact-list { list-style: none; margin: 0; padding: 0; }

.contact-list li {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
}

.contact-label {
  min-width: 76px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.contact-list a:hover { color: var(--brand); }

.contact-qr {
  text-align: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.contact-qr img { width: 170px; margin: 0 auto 12px; }

.contact-qr p { margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: #cbd5e1;
  padding: 26px 0;
  font-size: 14px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand img { width: 40px; height: 40px; }

.to-top:hover { color: #fff; }

/* ---------- 灯箱 ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(2, 6, 23, 0.92);
  padding: 40px;
}

.lightbox.open { display: flex; }

.lightbox-figure { margin: 0; max-width: 90vw; max-height: 86vh; text-align: center; }

.lightbox-figure img {
  max-width: 100%;
  max-height: 78vh;
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  margin: 0 auto;
}

.lightbox-figure figcaption { color: #e2e8f0; margin-top: 14px; font-size: 15px; }

.lightbox-close,
.lightbox-nav {
  position: absolute;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: none;
  cursor: pointer;
  border-radius: 50%;
  transition: background 0.2s;
}

.lightbox-close {
  top: 24px;
  right: 28px;
  width: 44px;
  height: 44px;
  font-size: 26px;
  line-height: 1;
}

.lightbox-nav {
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  font-size: 34px;
  line-height: 1;
}

.lightbox-prev { left: 24px; }
.lightbox-next { right: 24px; }

.lightbox-close:hover,
.lightbox-nav:hover { background: rgba(255, 255, 255, 0.28); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .about-grid,
  .contact-grid { grid-template-columns: 1fr; gap: 34px; }
  .about-media { order: -1; }
}

@media (max-width: 680px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .nav-links.open { max-height: 320px; }
  .nav-links a {
    padding: 16px 24px;
    width: 100%;
    border-top: 1px solid var(--line);
  }
  .section { padding: 60px 0; }
  .hero-inner { padding: 80px 24px 90px; }
  .cards { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .lightbox { padding: 16px; }
  .lightbox-prev { left: 8px; }
  .lightbox-next { right: 8px; }
}