/* ============================================================
   铭杉建材 · 官方网站 · 设计系统
   主色: 深靛蓝 #0f2742  强调色: 品牌金 #c9a24b
   字体: 苹方/冬青/微软雅黑/思源黑体 fallback
   ============================================================ */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* Brand Colors */
  --c-navy-900: #0a1d35;
  --c-navy-800: #0f2742;
  --c-navy-700: #1a3a5c;
  --c-navy-600: #2a4d75;
  --c-navy-500: #3b6290;
  --c-navy-100: #e3eaf3;
  --c-navy-50:  #f1f5fa;

  --c-gold-700: #a38236;
  --c-gold-600: #b8923d;
  --c-gold-500: #c9a24b;   /* 品牌主金 */
  --c-gold-400: #d6b566;
  --c-gold-100: #f5ecd5;
  --c-gold-50:  #fbf7eb;

  --c-ink:    #0a1626;
  --c-text:   #2a3441;
  --c-muted:  #6b7280;
  --c-soft:   #9aa3af;

  --c-bg:     #ffffff;
  --c-bg-soft:#f7f8fa;
  --c-bg-warm:#faf8f3;
  --c-border: #e5e7eb;
  --c-border-soft:#eef0f3;

  --c-success: #16a34a;
  --c-danger:  #dc2626;

  /* Typography */
  --f-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
            "Source Han Sans CN", "Noto Sans CJK SC", -apple-system,
            BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --f-serif: "Source Han Serif SC", "Noto Serif CJK SC",
             "Songti SC", "STSong", Georgia, serif;

  /* Spacing */
  --s-1:  4px;
  --s-2:  8px;
  --s-3:  12px;
  --s-4:  16px;
  --s-5:  20px;
  --s-6:  24px;
  --s-7:  32px;
  --s-8:  40px;
  --s-9:  48px;
  --s-10: 64px;
  --s-11: 80px;
  --s-12: 96px;
  --s-13: 128px;

  /* Radii */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-pill: 999px;

  /* Shadows */
  --sh-1: 0 1px 2px rgba(10, 29, 53, 0.04), 0 1px 3px rgba(10, 29, 53, 0.06);
  --sh-2: 0 2px 4px rgba(10, 29, 53, 0.04), 0 4px 12px rgba(10, 29, 53, 0.08);
  --sh-3: 0 8px 24px rgba(10, 29, 53, 0.08), 0 2px 6px rgba(10, 29, 53, 0.04);
  --sh-4: 0 16px 48px rgba(10, 29, 53, 0.12), 0 4px 12px rgba(10, 29, 53, 0.06);

  /* Layout */
  --container: 1240px;
  --container-narrow: 960px;
  --header-h:  72px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 2. Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, picture, video { max-width: 100%; display: block; height: auto; }
a { color: var(--c-navy-700); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-gold-600); }
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--s-4);
  color: var(--c-ink);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }
p  { margin: 0 0 var(--s-4); }
ul, ol { margin: 0 0 var(--s-4); padding-left: 1.5em; }
hr { border: 0; height: 1px; background: var(--c-border); margin: var(--s-8) 0; }
:focus-visible { outline: 2px solid var(--c-gold-500); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--c-gold-100); color: var(--c-ink); }

/* ---------- 3. Layout Utilities ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--s-6); }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--s-6); }
.section { padding: var(--s-12) 0; }
.section-sm { padding: var(--s-10) 0; }
.section-warm { background: var(--c-bg-warm); }
.section-soft { background: var(--c-bg-soft); }
.section-navy { background: var(--c-navy-800); color: rgba(255,255,255,0.92); }
.section-navy h1, .section-navy h2, .section-navy h3, .section-navy h4 { color: #fff; }
.grid { display: grid; gap: var(--s-6); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 980px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.text-center { text-align: center; }
.muted { color: var(--c-muted); }
.gold { color: var(--c-gold-600); }
.eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-gold-600);
  margin-bottom: var(--s-3);
}
.lead {
  font-size: 1.125rem;
  color: var(--c-muted);
  line-height: 1.7;
  max-width: 720px;
}
.section-head { text-align: center; margin-bottom: var(--s-9); }
.section-head .lead { margin: var(--s-3) auto 0; }

/* ---------- 4. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--s-2);
  padding: 14px 28px;
  font-size: 1rem; font-weight: 600;
  border-radius: var(--r-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  white-space: nowrap;
  line-height: 1;
}
.btn-primary {
  background: var(--c-gold-500);
  color: var(--c-ink);
  box-shadow: 0 4px 12px rgba(201, 162, 75, 0.32);
}
.btn-primary:hover {
  background: var(--c-gold-600);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(201, 162, 75, 0.4);
}
.btn-secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.4);
}
.btn-secondary:hover { background: rgba(255,255,255,0.1); border-color: #fff; color: #fff; }
.btn-navy {
  background: var(--c-navy-800);
  color: #fff;
}
.btn-navy:hover { background: var(--c-navy-700); color: #fff; transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  color: var(--c-navy-800);
  border-color: var(--c-navy-800);
}
.btn-outline:hover { background: var(--c-navy-800); color: #fff; }
.btn-ghost {
  background: transparent;
  color: var(--c-navy-800);
  border-color: var(--c-border);
}
.btn-ghost:hover { border-color: var(--c-navy-800); background: var(--c-navy-50); }
.btn-lg { padding: 18px 36px; font-size: 1.0625rem; }
.btn-sm { padding: 10px 18px; font-size: 0.9rem; }
.btn-arrow::after { content: "→"; transition: transform var(--transition); }
.btn-arrow:hover::after { transform: translateX(3px); }

/* ---------- 5. Header / Navigation ---------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}
.header.scrolled { border-bottom-color: var(--c-border); box-shadow: var(--sh-1); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h);
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-6);
}
.brand {
  display: flex; align-items: center; gap: var(--s-3);
  font-weight: 800; font-size: 1.125rem;
  color: var(--c-ink);
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--c-navy-800) 0%, var(--c-navy-700) 100%);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-gold-500); font-weight: 800; font-size: 1.125rem;
  position: relative;
  box-shadow: 0 2px 8px rgba(15, 39, 66, 0.2);
}
.brand-mark::after {
  content: ""; position: absolute; inset: 2px;
  border: 1px solid rgba(201, 162, 75, 0.25);
  border-radius: 8px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { color: var(--c-ink); font-size: 1.0625rem; }
.brand-text small { color: var(--c-muted); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.1em; }

.nav { display: flex; align-items: center; gap: var(--s-2); }
.nav a {
  position: relative;
  padding: 8px 14px;
  color: var(--c-text);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: var(--r-sm);
}
.nav a:hover, .nav a.active { color: var(--c-navy-800); background: var(--c-navy-50); }
.nav a.active::after {
  content: ""; position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px; background: var(--c-gold-500);
  border-radius: 1px;
}
.header-cta { display: flex; align-items: center; gap: var(--s-3); }
.header-phone {
  display: flex; align-items: center; gap: var(--s-2);
  color: var(--c-navy-800); font-weight: 700;
  font-size: 1rem;
}
.header-phone::before {
  content: "📞"; font-size: 0.9rem;
}
.menu-btn {
  display: none;
  width: 40px; height: 40px;
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  cursor: pointer;
  flex-direction: column;
  align-items: center; justify-content: center;
  gap: 4px;
  padding: 0;
}
.menu-btn span {
  display: block; width: 18px; height: 2px;
  background: var(--c-navy-800);
  border-radius: 1px;
  transition: all var(--transition);
}
.menu-btn.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-btn.open span:nth-child(2) { opacity: 0; }
.menu-btn.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 980px) {
  .nav { display: none; }
  .header-phone { display: none; }
  .menu-btn { display: flex; }
  .header-cta .btn { display: none; }
}
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-h); left: 0; right: 0;
  background: #fff;
  border-top: 1px solid var(--c-border);
  padding: var(--s-4) var(--s-6) var(--s-6);
  z-index: 99;
  box-shadow: var(--sh-3);
}
.mobile-nav.open { display: block; }
.mobile-nav a {
  display: block;
  padding: var(--s-4) 0;
  color: var(--c-text);
  font-weight: 500;
  font-size: 1.0625rem;
  border-bottom: 1px solid var(--c-border-soft);
}
.mobile-nav a:last-child { border-bottom: 0; }
.mobile-nav .btn { width: 100%; margin-top: var(--s-3); }
.mobile-nav .header-phone { display: flex; margin-top: var(--s-3); padding: var(--s-4) 0; border-top: 1px solid var(--c-border); }

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  padding: var(--s-12) 0 var(--s-11);
  background:
    linear-gradient(135deg, var(--c-navy-800) 0%, var(--c-navy-700) 60%, var(--c-navy-600) 100%);
  color: #fff;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 80% 20%, rgba(201, 162, 75, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 20% 80%, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image: linear-gradient(to right, rgba(255,255,255,0.03) 1px, transparent 1px),
                    linear-gradient(to bottom, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, #000 30%, transparent 80%);
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--s-9);
  align-items: center;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-6);
  z-index: 1;
}
@media (max-width: 980px) { .hero-inner { grid-template-columns: 1fr; gap: var(--s-7); } }
.hero-tag {
  display: inline-flex; align-items: center; gap: var(--s-2);
  background: rgba(201, 162, 75, 0.12);
  color: var(--c-gold-400);
  border: 1px solid rgba(201, 162, 75, 0.3);
  padding: 6px 14px;
  border-radius: var(--r-pill);
  font-size: 0.875rem; font-weight: 500;
  margin-bottom: var(--s-5);
}
.hero-tag::before {
  content: ""; width: 6px; height: 6px;
  background: var(--c-gold-500);
  border-radius: 50%;
}
.hero h1 {
  color: #fff;
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  line-height: 1.18;
  margin-bottom: var(--s-5);
}
.hero h1 .gold-text {
  background: linear-gradient(135deg, var(--c-gold-400), var(--c-gold-500));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead {
  color: rgba(255,255,255,0.78);
  font-size: 1.125rem;
  max-width: 560px;
  margin-bottom: var(--s-7);
}
.hero-cta { display: flex; gap: var(--s-3); flex-wrap: wrap; }
.hero-meta {
  display: flex; gap: var(--s-7);
  margin-top: var(--s-8);
  padding-top: var(--s-6);
  border-top: 1px solid rgba(255,255,255,0.12);
  flex-wrap: wrap;
}
.hero-meta-item {
  display: flex; flex-direction: column; gap: 4px;
}
.hero-meta-num {
  font-size: 1.75rem; font-weight: 800;
  color: var(--c-gold-400);
  letter-spacing: -0.02em;
}
.hero-meta-label {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.05em;
}
.hero-visual {
  position: relative;
  aspect-ratio: 4 / 5;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--sh-4);
  border: 1px solid rgba(255,255,255,0.1);
}
.hero-visual img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero-visual-badge {
  position: absolute;
  bottom: var(--s-5); left: var(--s-5);
  background: rgba(255,255,255,0.96);
  color: var(--c-ink);
  padding: var(--s-3) var(--s-4);
  border-radius: var(--r-md);
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: var(--sh-2);
  display: flex; align-items: center; gap: var(--s-2);
}
.hero-visual-badge::before {
  content: ""; width: 8px; height: 8px;
  background: var(--c-success);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.18);
}
.hero-trust {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--s-5) var(--s-6);
  display: flex; justify-content: center; align-items: center; gap: var(--s-7);
  flex-wrap: wrap;
  margin-top: -32px;
  background: #fff;
  border-radius: var(--r-lg);
  box-shadow: var(--sh-3);
  z-index: 2;
}
.hero-trust-item {
  display: flex; align-items: center; gap: var(--s-2);
  color: var(--c-text);
  font-size: 0.9375rem; font-weight: 500;
}
.hero-trust-item::before {
  content: "✓";
  width: 22px; height: 22px;
  background: var(--c-gold-50);
  color: var(--c-gold-600);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.75rem;
}

/* ---------- 7. Section: Products / Cards ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-5);
}
@media (max-width: 980px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .product-grid { grid-template-columns: 1fr; } }
.product-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: all var(--transition);
  position: relative;
}
.product-card:hover {
  border-color: var(--c-gold-500);
  transform: translateY(-4px);
  box-shadow: var(--sh-3);
}
.product-card-image {
  aspect-ratio: 4 / 3;
  background: var(--c-navy-50);
  overflow: hidden;
  position: relative;
}
.product-card-image img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.product-card:hover .product-card-image img { transform: scale(1.05); }
.product-card-body { padding: var(--s-5); }
.product-card-body h3 {
  font-size: 1.125rem;
  margin-bottom: var(--s-2);
}
.product-card-body p {
  color: var(--c-muted);
  font-size: 0.9375rem;
  margin-bottom: var(--s-3);
}
.product-card-tag {
  display: inline-block;
  background: var(--c-navy-50);
  color: var(--c-navy-700);
  padding: 4px 10px;
  border-radius: var(--r-sm);
  font-size: 0.75rem; font-weight: 500;
  margin-right: 4px; margin-bottom: 4px;
}
.product-card-link {
  display: inline-flex; align-items: center; gap: 4px;
  color: var(--c-gold-600);
  font-weight: 600; font-size: 0.9rem;
  margin-top: var(--s-3);
}
.product-card-link::after { content: "→"; transition: transform var(--transition); }
.product-card-link:hover { color: var(--c-gold-700); }
.product-card-link:hover::after { transform: translateX(3px); }

/* ---------- 8. Features ---------- */
.feature {
  text-align: left;
  padding: var(--s-6);
  background: #fff;
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border);
  transition: all var(--transition);
}
.feature:hover {
  border-color: var(--c-gold-500);
  box-shadow: var(--sh-2);
  transform: translateY(-2px);
}
.feature-icon {
  width: 48px; height: 48px;
  background: var(--c-gold-50);
  color: var(--c-gold-600);
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--s-4);
}
.feature h3 { font-size: 1.125rem; margin-bottom: var(--s-2); }
.feature p { color: var(--c-muted); font-size: 0.9375rem; margin: 0; }

/* ---------- 9. Case Grid ---------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}
@media (max-width: 980px) { .case-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .case-grid { grid-template-columns: 1fr; } }
.case-card {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--c-navy-50);
  cursor: pointer;
  transition: transform var(--transition);
}
.case-card:hover { transform: translateY(-3px); }
.case-card img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.case-card:hover img { transform: scale(1.05); }
.case-card-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(10, 29, 53, 0.85) 0%, transparent 50%);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: var(--s-5);
  color: #fff;
}
.case-card-tag {
  position: absolute; top: var(--s-4); left: var(--s-4);
  background: rgba(255,255,255,0.95);
  color: var(--c-navy-800);
  padding: 4px 10px;
  border-radius: var(--r-sm);
  font-size: 0.75rem; font-weight: 600;
}
.case-card-title {
  font-size: 1.0625rem; font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}
.case-card-meta { font-size: 0.8125rem; color: rgba(255,255,255,0.75); }

/* ---------- 10. Pain vs Solution ---------- */
.pain-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-6);
  align-items: stretch;
}
@media (max-width: 880px) { .pain-grid { grid-template-columns: 1fr; } }
.pain-card, .solution-card {
  padding: var(--s-6);
  border-radius: var(--r-lg);
}
.pain-card {
  background: #fff;
  border: 1px solid var(--c-border);
}
.pain-card h3, .solution-card h3 {
  font-size: 1.125rem; margin-bottom: var(--s-4);
  display: flex; align-items: center; gap: var(--s-2);
}
.pain-card h3 { color: var(--c-danger); }
.pain-card h3::before { content: "✕"; color: var(--c-danger); font-weight: 700; }
.solution-card {
  background: var(--c-navy-800);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.solution-card h3 { color: var(--c-gold-400); }
.solution-card h3::before { content: "✓"; color: var(--c-gold-500); font-weight: 700; }
.solution-card::before {
  content: "";
  position: absolute; top: -50%; right: -20%;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(201, 162, 75, 0.15) 0%, transparent 70%);
  border-radius: 50%;
}
.pain-list, .solution-list {
  list-style: none; padding: 0; margin: 0;
}
.pain-list li, .solution-list li {
  padding: var(--s-3) 0;
  border-bottom: 1px solid var(--c-border-soft);
  font-size: 0.9375rem;
  display: flex; align-items: flex-start; gap: var(--s-2);
}
.pain-list li:last-child, .solution-list li:last-child { border-bottom: 0; }
.pain-list li::before { content: "—"; color: var(--c-muted); flex-shrink: 0; }
.solution-list li::before { content: "→"; color: var(--c-gold-400); flex-shrink: 0; font-weight: 700; }
.solution-card .pain-list, .solution-card .solution-list { position: relative; z-index: 1; }
.solution-card li { color: rgba(255,255,255,0.92); border-bottom-color: rgba(255,255,255,0.1); }

/* ---------- 11. Stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-5);
  text-align: center;
}
@media (max-width: 880px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat {
  padding: var(--s-6) var(--s-4);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--r-lg);
  transition: all var(--transition);
}
.stat:hover { background: rgba(255,255,255,0.1); border-color: rgba(201, 162, 75, 0.4); }
.stat-num {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--c-gold-400);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: var(--s-2);
}
.stat-num small { font-size: 0.5em; color: var(--c-gold-500); }
.stat-label {
  color: rgba(255,255,255,0.75);
  font-size: 0.9375rem;
}

/* ---------- 12. FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  margin-bottom: var(--s-3);
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item.open {
  border-color: var(--c-gold-500);
  box-shadow: var(--sh-1);
}
.faq-q {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-4);
  padding: var(--s-5);
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: 1.0625rem; font-weight: 600;
  color: var(--c-ink);
  line-height: 1.5;
}
.faq-q:hover { color: var(--c-gold-700); }
.faq-q::after {
  content: "+";
  flex-shrink: 0;
  width: 28px; height: 28px;
  background: var(--c-bg-soft);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-navy-800);
  font-size: 1.125rem; font-weight: 400;
  transition: all var(--transition);
}
.faq-item.open .faq-q::after {
  content: "−";
  background: var(--c-gold-500);
  color: #fff;
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-item.open .faq-a { max-height: 600px; }
.faq-a-inner {
  padding: 0 var(--s-5) var(--s-5);
  color: var(--c-muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}
.faq-a-inner p:last-child { margin-bottom: 0; }

/* ---------- 13. CTA Banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--c-navy-800) 0%, var(--c-navy-700) 100%);
  border-radius: var(--r-xl);
  padding: var(--s-10) var(--s-8);
  color: #fff;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--s-7);
  align-items: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute; right: -100px; top: -100px;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(201, 162, 75, 0.2) 0%, transparent 70%);
  border-radius: 50%;
}
.cta-banner h2 { color: #fff; margin-bottom: var(--s-3); }
.cta-banner p { color: rgba(255,255,255,0.8); margin: 0; }
.cta-banner-actions {
  display: flex; gap: var(--s-3); flex-wrap: wrap;
  position: relative; z-index: 1;
  justify-content: flex-end;
}
@media (max-width: 880px) {
  .cta-banner { grid-template-columns: 1fr; padding: var(--s-8) var(--s-6); }
  .cta-banner-actions { justify-content: flex-start; }
}

/* ---------- 14. Breadcrumb ---------- */
.breadcrumb {
  background: var(--c-bg-soft);
  padding: var(--s-4) 0;
  border-bottom: 1px solid var(--c-border);
}
.breadcrumb ol {
  list-style: none; padding: 0; margin: 0;
  display: flex; gap: var(--s-2);
  font-size: 0.875rem;
  color: var(--c-muted);
  flex-wrap: wrap;
}
.breadcrumb li { display: flex; align-items: center; gap: var(--s-2); }
.breadcrumb li:not(:last-child)::after { content: "/"; color: var(--c-soft); }
.breadcrumb a { color: var(--c-muted); }
.breadcrumb a:hover { color: var(--c-navy-800); }
.breadcrumb li:last-child { color: var(--c-ink); font-weight: 500; }

/* ---------- 15. Page Hero (sub-pages) ---------- */
.page-hero {
  background: var(--c-bg-soft);
  padding: var(--s-9) 0;
  border-bottom: 1px solid var(--c-border);
}
.page-hero h1 {
  margin-bottom: var(--s-3);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
}
.page-hero .lead { margin: 0; }

/* ---------- 16. Article / Content ---------- */
.article {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--c-text);
}
.article h2 {
  margin: var(--s-9) 0 var(--s-4);
  font-size: 1.5rem;
  padding-left: var(--s-3);
  border-left: 4px solid var(--c-gold-500);
}
.article h3 {
  margin: var(--s-7) 0 var(--s-3);
  font-size: 1.25rem;
}
.article p { margin-bottom: var(--s-4); }
.article ul, .article ol { margin-bottom: var(--s-5); padding-left: 1.5em; }
.article li { margin-bottom: var(--s-2); }
.article blockquote {
  margin: var(--s-6) 0;
  padding: var(--s-4) var(--s-5);
  background: var(--c-bg-soft);
  border-left: 4px solid var(--c-navy-700);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  color: var(--c-text);
  font-style: normal;
}
.article-meta {
  display: flex; align-items: center; gap: var(--s-3);
  color: var(--c-muted);
  font-size: 0.875rem;
  margin-bottom: var(--s-7);
  padding-bottom: var(--s-5);
  border-bottom: 1px solid var(--c-border);
  flex-wrap: wrap;
}
.article-meta .tag {
  background: var(--c-gold-50);
  color: var(--c-gold-700);
  padding: 4px 10px;
  border-radius: var(--r-sm);
  font-weight: 600;
}
.article-cta {
  margin-top: var(--s-9);
  padding: var(--s-7);
  background: var(--c-bg-warm);
  border-radius: var(--r-lg);
  text-align: center;
}
.article-cta h3 { margin-bottom: var(--s-3); }
.article-cta p { color: var(--c-muted); margin-bottom: var(--s-5); }
.article-cta .btn-group { display: inline-flex; gap: var(--s-3); flex-wrap: wrap; justify-content: center; }

/* ---------- 17. News list ---------- */
.news-list { max-width: 880px; margin: 0 auto; }
.news-item {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--s-6);
  padding: var(--s-6) 0;
  border-bottom: 1px solid var(--c-border);
  align-items: start;
}
@media (max-width: 720px) { .news-item { grid-template-columns: 1fr; gap: var(--s-3); } }
.news-item-image {
  aspect-ratio: 16 / 10;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-bg-soft);
}
.news-item-image img { width: 100%; height: 100%; object-fit: cover; }
.news-item h3 { font-size: 1.25rem; margin-bottom: var(--s-2); }
.news-item p { color: var(--c-muted); font-size: 0.9375rem; margin-bottom: var(--s-3); }
.news-item-meta { display: flex; gap: var(--s-3); color: var(--c-soft); font-size: 0.8125rem; align-items: center; }
.news-item-meta .tag-cat {
  background: var(--c-navy-50);
  color: var(--c-navy-700);
  padding: 3px 10px;
  border-radius: var(--r-sm);
  font-weight: 500;
}

/* ---------- 18. Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--s-7);
  align-items: start;
}
@media (max-width: 880px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-info { padding-right: var(--s-3); }
.contact-info h2 { margin-bottom: var(--s-4); }
.contact-info > p { color: var(--c-muted); margin-bottom: var(--s-7); }
.contact-list {
  list-style: none; padding: 0; margin: 0 0 var(--s-7);
}
.contact-list li {
  display: flex; gap: var(--s-4);
  padding: var(--s-4) 0;
  border-bottom: 1px solid var(--c-border-soft);
}
.contact-list li:last-child { border-bottom: 0; }
.contact-icon {
  width: 44px; height: 44px;
  background: var(--c-gold-50);
  color: var(--c-gold-600);
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}
.contact-list strong {
  display: block;
  color: var(--c-ink);
  font-size: 0.875rem;
  margin-bottom: 4px;
}
.contact-list span { color: var(--c-text); font-size: 1rem; line-height: 1.6; }
.contact-list a { color: var(--c-navy-800); font-weight: 600; }
.contact-list a:hover { color: var(--c-gold-600); }

.form-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-7);
  box-shadow: var(--sh-2);
}
.form-card h3 { margin-bottom: var(--s-2); font-size: 1.25rem; }
.form-card > p { color: var(--c-muted); font-size: 0.9375rem; margin-bottom: var(--s-5); }
.form-row { margin-bottom: var(--s-4); }
.form-row label {
  display: block;
  font-size: 0.875rem; font-weight: 500;
  color: var(--c-ink);
  margin-bottom: var(--s-2);
}
.form-row label .req { color: var(--c-danger); }
.form-row input, .form-row select, .form-row textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--c-ink);
  background: #fff;
  transition: border-color var(--transition);
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--c-gold-500);
  box-shadow: 0 0 0 3px rgba(201, 162, 75, 0.12);
}
.form-row textarea { min-height: 100px; resize: vertical; }
.form-row .form-hint { color: var(--c-muted); font-size: 0.8125rem; margin-top: 4px; }
.form-row .form-success {
  background: #f0fdf4; color: #166534;
  border: 1px solid #bbf7d0;
  border-radius: var(--r-sm);
  padding: var(--s-3) var(--s-4);
  font-size: 0.875rem;
  display: none;
}
.form-row.form-success-show .form-success { display: block; }

/* ---------- 19. About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--s-9);
  align-items: center;
}
@media (max-width: 880px) { .about-grid { grid-template-columns: 1fr; } }
.about-visual {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  aspect-ratio: 5 / 4;
  box-shadow: var(--sh-3);
}
.about-visual img { width: 100%; height: 100%; object-fit: cover; }
.about-visual .badge {
  position: absolute; bottom: var(--s-5); left: var(--s-5);
  background: rgba(255,255,255,0.96);
  padding: var(--s-3) var(--s-4);
  border-radius: var(--r-md);
  font-size: 0.875rem; font-weight: 600;
  color: var(--c-ink);
  box-shadow: var(--sh-2);
}
.about-list {
  list-style: none; padding: 0; margin: var(--s-5) 0 0;
}
.about-list li {
  display: flex; gap: var(--s-3);
  padding: var(--s-3) 0;
  align-items: flex-start;
}
.about-list li::before {
  content: "✓";
  width: 24px; height: 24px;
  background: var(--c-gold-500);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.75rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.about-list strong { color: var(--c-ink); }
.about-list span { color: var(--c-muted); font-size: 0.9375rem; }

.license-card {
  display: flex; gap: var(--s-5);
  padding: var(--s-5);
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  align-items: center;
  margin-top: var(--s-6);
}
.license-card img {
  width: 140px; height: auto;
  border-radius: var(--r-sm);
  border: 1px solid var(--c-border);
  flex-shrink: 0;
}
.license-card-text { font-size: 0.875rem; }
.license-card-text strong { color: var(--c-ink); display: block; margin-bottom: 4px; }
.license-card-text code {
  display: inline-block;
  background: var(--c-bg-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8125rem;
  color: var(--c-navy-700);
  margin-top: 2px;
}

/* ---------- 20. Service Steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--s-4);
  position: relative;
}
@media (max-width: 980px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }
.step {
  text-align: center;
  padding: var(--s-6) var(--s-3);
  background: #fff;
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border);
  position: relative;
}
.step-num {
  width: 48px; height: 48px;
  background: var(--c-navy-800);
  color: var(--c-gold-500);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.25rem;
  margin: 0 auto var(--s-3);
  border: 3px solid #fff;
  box-shadow: var(--sh-1);
}
.step h3 { font-size: 1.0625rem; margin-bottom: var(--s-2); }
.step p { color: var(--c-muted); font-size: 0.875rem; margin: 0; line-height: 1.6; }
@media (min-width: 980px) {
  .step::after {
    content: "→";
    position: absolute;
    top: 50%;
    right: -16px;
    transform: translateY(-50%);
    color: var(--c-gold-500);
    font-size: 1.25rem;
    font-weight: 700;
    z-index: 1;
  }
  .step:last-child::after { display: none; }
}

/* ---------- 21. Footer ---------- */
.footer {
  background: var(--c-navy-900);
  color: rgba(255,255,255,0.7);
  padding: var(--s-11) 0 var(--s-7);
  font-size: 0.9375rem;
}
.footer a { color: rgba(255,255,255,0.7); }
.footer a:hover { color: var(--c-gold-400); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--s-7);
  margin-bottom: var(--s-8);
}
@media (max-width: 880px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.footer h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: var(--s-4);
  font-weight: 600;
}
.footer-brand { color: #fff; }
.footer-brand .brand { color: #fff; margin-bottom: var(--s-3); }
.footer-brand p { color: rgba(255,255,255,0.6); line-height: 1.7; font-size: 0.9rem; }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer ul li { margin-bottom: var(--s-2); }
.footer-contact {
  display: flex; align-items: flex-start; gap: var(--s-3);
  margin-bottom: var(--s-3);
  font-size: 0.9rem;
}
.footer-contact::before {
  content: "▸";
  color: var(--c-gold-500);
  margin-top: 2px;
  flex-shrink: 0;
}
.footer-bottom {
  padding-top: var(--s-6);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: var(--s-3);
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.5);
}
.footer-icp { display: flex; gap: var(--s-4); align-items: center; }
.footer-icp a { color: rgba(255,255,255,0.5); }
.footer-icp a:hover { color: var(--c-gold-400); }

/* ---------- 22. Floating CTA (mobile) ---------- */
.fab {
  display: none;
  position: fixed;
  right: var(--s-4); bottom: var(--s-4);
  z-index: 50;
  flex-direction: column;
  gap: var(--s-2);
}
.fab a {
  width: 52px; height: 52px;
  background: var(--c-gold-500);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--sh-3);
  transition: all var(--transition);
}
.fab a:hover { background: var(--c-gold-600); transform: scale(1.05); color: #fff; }
.fab a.fab-phone { background: var(--c-navy-800); }
.fab a.fab-top { background: #fff; color: var(--c-navy-800); border: 1px solid var(--c-border); }
@media (max-width: 980px) { .fab { display: flex; } }

/* ---------- 23. Animations ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal-stagger > * { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal-stagger.in > * { opacity: 1; transform: translateY(0); }
.reveal-stagger.in > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger.in > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.in > *:nth-child(3) { transition-delay: 0.15s; }
.reveal-stagger.in > *:nth-child(4) { transition-delay: 0.2s; }
.reveal-stagger.in > *:nth-child(5) { transition-delay: 0.25s; }
.reveal-stagger.in > *:nth-child(6) { transition-delay: 0.3s; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal, .reveal-stagger > * { opacity: 1; transform: none; }
}

/* ---------- 24. Utility: keyword tags (SEO 关键词云) ---------- */
.kw-cloud {
  display: flex; flex-wrap: wrap; gap: var(--s-2);
  margin-top: var(--s-5);
}
.kw-cloud a {
  font-size: 0.8125rem;
  background: var(--c-bg-soft);
  color: var(--c-muted);
  padding: 4px 10px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-border-soft);
}
.kw-cloud a:hover { background: var(--c-navy-800); color: #fff; border-color: var(--c-navy-800); }
.kw-cloud.alt a { background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.7); border-color: rgba(255,255,255,0.1); }
.kw-cloud.alt a:hover { background: var(--c-gold-500); color: #fff; border-color: var(--c-gold-500); }

/* ---------- 25. Service / Scenario cards ---------- */
.scenario {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-6);
  transition: all var(--transition);
}
.scenario:hover { border-color: var(--c-gold-500); transform: translateY(-3px); box-shadow: var(--sh-2); }
.scenario-icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg, var(--c-navy-800), var(--c-navy-700));
  color: var(--c-gold-500);
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--s-4);
}
.scenario h3 { font-size: 1.125rem; margin-bottom: var(--s-2); }
.scenario p { color: var(--c-muted); font-size: 0.9375rem; margin: 0; }

/* ---------- 26. Spec table ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--s-5) 0;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
  font-size: 0.9375rem;
}
.spec-table th, .spec-table td {
  padding: var(--s-3) var(--s-4);
  text-align: left;
  border-bottom: 1px solid var(--c-border-soft);
}
.spec-table th {
  background: var(--c-bg-soft);
  color: var(--c-ink);
  font-weight: 600;
  font-size: 0.875rem;
  width: 30%;
}
.spec-table tr:last-child td { border-bottom: 0; }
.spec-table tr:hover td { background: var(--c-bg-soft); }

/* ---------- 27. Helper ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.divider-gold {
  width: 60px; height: 3px;
  background: var(--c-gold-500);
  margin: var(--s-3) 0 var(--s-5);
  border-radius: 2px;
}
.divider-gold.center { margin: var(--s-3) auto var(--s-5); }