/* ============================================================
   田头金属材料官网 · 重金属工业风主题
   深炭灰钢感 + 琥珀金点缀 + 拉丝金属质感
   ============================================================ */

:root {
  --navy: #17191d;          /* 深炭灰（主深色） */
  --navy-2: #1f2329;        /* 次深色 */
  --navy-3: #262b33;        /* 卡片深色 */
  --gold: #d9a441;          /* 琥珀金（主强调） */
  --gold-deep: #b5822a;
  --gold-soft: #faf3e3;
  --steel: #c8cdd4;         /* 金属银 */
  --ink: #23272e;
  --ink-2: #5b6470;
  --bg: #ffffff;
  --bg-soft: #f4f5f7;
  --line: #e3e6ea;
  --line-dark: #32383f;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(18, 22, 28, .10);
  --shadow-lg: 0 22px 55px rgba(18, 22, 28, .18);
  --header-h: 74px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 30px; border-radius: 8px;
  font-size: 15px; font-weight: 600; text-decoration: none;
  transition: all .3s ease; cursor: pointer; border: none; white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-deep) 100%);
  color: #1d1405; box-shadow: 0 8px 20px rgba(217, 164, 65, .35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 28px rgba(217, 164, 65, .45); }
.btn-light { background: #fff; color: var(--navy); }
.btn-light:hover { transform: translateY(-3px); box-shadow: 0 14px 28px rgba(0, 0, 0, .18); }
.btn-outline { background: transparent; border: 1.5px solid var(--navy); color: var(--navy); }
.btn-outline:hover { background: var(--navy); color: #fff; }
.btn-outline-light { background: transparent; border: 1.5px solid rgba(255,255,255,.55); color: #fff; }
.btn-outline-light:hover { background: rgba(255,255,255,.12); border-color: #fff; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(23, 25, 29, .92);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(217, 164, 65, .18);
}
.header-inner {
  max-width: 1180px; margin: 0 auto; height: 100%;
  padding: 0 24px; display: flex; align-items: center; gap: 28px;
}
.logo { display: flex; align-items: center; gap: 11px; text-decoration: none; flex-shrink: 0; }
.logo-mark {
  width: 38px; height: 38px; border-radius: 8px; flex-shrink: 0;
  background: linear-gradient(145deg, #3a3f47 0%, #23272e 55%, #14171b 100%);
  border: 1px solid rgba(217, 164, 65, .45);
  display: flex; align-items: center; justify-content: center;
  color: var(--gold); font-size: 17px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08), 0 4px 10px rgba(0,0,0,.35);
}
.logo-text { display: flex; flex-direction: column; line-height: 1.25; }
.logo-text strong { font-size: 17px; color: #fff; letter-spacing: 1px; }
.logo-text span { font-size: 10px; color: var(--gold); letter-spacing: 2.5px; }
.main-nav { display: flex; gap: 4px; margin-left: auto; }
.main-nav a {
  position: relative; padding: 8px 14px; font-size: 15px;
  color: rgba(255,255,255,.78); text-decoration: none; transition: color .25s;
}
.main-nav a:hover { color: #fff; }
.main-nav a.active { color: var(--gold); font-weight: 600; }
.main-nav a.active::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px;
  height: 2.5px; border-radius: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-deep));
}
.header-cta {
  display: inline-flex; align-items: center; gap: 8px; flex-shrink: 0;
  padding: 9px 18px; border-radius: 8px; text-decoration: none;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  color: #1d1405; font-size: 14px; font-weight: 700;
  transition: all .3s;
}
.header-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(217, 164, 65, .4); }
.nav-toggle {
  display: none; background: none; border: 1px solid rgba(255,255,255,.25);
  border-radius: 8px; width: 40px; height: 40px;
  color: #fff; font-size: 16px; cursor: pointer;
}

/* ---------- Hero（视频背景） ---------- */
.hero {
  position: relative; min-height: 92vh;
  display: flex; align-items: center;
  padding: calc(var(--header-h) + 66px) 0 120px;
  background: var(--navy); overflow: hidden;
}
.hero-video {
  position: absolute; inset: 0; z-index: 0;
}
.hero-video video {
  width: 100%; height: 100%; object-fit: cover; opacity: .5;
}
.hero-video::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(105deg, rgba(18,20,24,.96) 0%, rgba(18,20,24,.82) 42%, rgba(18,20,24,.45) 75%, rgba(18,20,24,.7) 100%);
}
.hero .container { position: relative; z-index: 2; display: grid; grid-template-columns: 1.05fr .95fr; gap: 60px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 8px 18px; border-radius: 999px;
  background: rgba(217, 164, 65, .12); border: 1px solid rgba(217, 164, 65, .4);
  color: var(--gold); font-size: 13.5px; font-weight: 600; letter-spacing: .5px;
  margin-bottom: 24px;
}
.hero-badge i { font-size: 11px; }
.hero h1 {
  font-size: 48px; line-height: 1.28; color: #fff;
  letter-spacing: 1px; margin-bottom: 22px; font-weight: 800;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, #f0c96e 0%, var(--gold) 55%, var(--gold-deep) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { font-size: 17px; color: rgba(255,255,255,.78); max-width: 540px; margin-bottom: 36px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-points { display: flex; gap: 26px; margin-top: 40px; flex-wrap: wrap; }
.hero-points .hp { display: flex; align-items: center; gap: 9px; color: rgba(255,255,255,.82); font-size: 14.5px; }
.hero-points .hp i { color: var(--gold); font-size: 15px; }

/* Hero 右侧：金属质感大卡 */
.hero-card {
  position: relative; border-radius: var(--radius); overflow: hidden;
  border: 1px solid rgba(200, 205, 212, .22);
  box-shadow: var(--shadow-lg);
}
.hero-card img { width: 100%; aspect-ratio: 4/3.4; object-fit: cover; }
.hero-card .hc-tag {
  position: absolute; left: 22px; bottom: 22px; right: 22px;
  padding: 18px 22px; border-radius: 10px;
  background: rgba(23, 25, 29, .88); backdrop-filter: blur(8px);
  border: 1px solid rgba(217, 164, 65, .35);
}
.hc-tag b { display: block; color: var(--gold); font-size: 24px; letter-spacing: 1px; }
.hc-tag span { color: rgba(255,255,255,.78); font-size: 13.5px; }

/* ---------- 数据统计条 ---------- */
.stat-band {
  position: relative; z-index: 3; margin-top: -58px;
  background: linear-gradient(135deg, #23272e 0%, #17191d 100%);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  display: grid; grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
}
.stat-band .stat { padding: 30px 20px; text-align: center; position: relative; }
.stat-band .stat + .stat::before { content: ""; position: absolute; left: 0; top: 26%; bottom: 26%; width: 1px; background: var(--line-dark); }
.stat-band .num { font-size: 36px; font-weight: 800; color: var(--gold); line-height: 1.2; letter-spacing: .5px; }
.stat-band .num small { font-size: 16px; font-weight: 700; }
.stat-band .lbl { font-size: 14px; color: rgba(255,255,255,.62); margin-top: 4px; }

/* ---------- 区块通用 ---------- */
.section { padding: 96px 0; }
.section-soft { background: var(--bg-soft); }
.section-dark {
  background:
    radial-gradient(ellipse 600px 300px at 85% 10%, rgba(217, 164, 65, .08), transparent),
    linear-gradient(160deg, #1f2329 0%, #17191d 100%);
  color: #fff;
}
.sec-head { margin-bottom: 54px; display: flex; justify-content: space-between; align-items: flex-end; gap: 26px; }
.sec-head.center { flex-direction: column; align-items: center; text-align: center; }
.sec-kicker {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--gold-deep); font-size: 13px; font-weight: 700;
  letter-spacing: 3px; margin-bottom: 10px;
}
.sec-kicker::before { content: ""; width: 26px; height: 2px; background: var(--gold); }
.section-dark .sec-kicker { color: var(--gold); }
.sec-head h2 { font-size: 34px; letter-spacing: .5px; line-height: 1.35; }
.sec-head p { color: var(--ink-2); margin-top: 8px; max-width: 640px; }
.section-dark .sec-head p { color: rgba(255,255,255,.65); }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 26px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.feature-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 28px; transition: all .35s; position: relative; overflow: hidden;
}
.feature-card::after {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(180deg, var(--gold), var(--gold-deep));
  transform: scaleY(0); transform-origin: top; transition: transform .35s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.feature-card:hover::after { transform: scaleY(1); }
.feature-icon {
  width: 54px; height: 54px; border-radius: 12px;
  background: linear-gradient(145deg, #2b3038, #17191d);
  border: 1px solid rgba(217, 164, 65, .3);
  display: flex; align-items: center; justify-content: center;
  color: var(--gold); font-size: 21px; margin-bottom: 20px;
}
.feature-card h3 { font-size: 18px; margin-bottom: 10px; }
.feature-card p { font-size: 14.5px; color: var(--ink-2); }
.feature-num {
  position: absolute; top: 20px; right: 24px;
  font-size: 34px; font-weight: 800; color: var(--bg-soft);
  line-height: 1; letter-spacing: 1px; transition: color .35s;
}
.feature-card:hover .feature-num { color: var(--gold-soft); }

/* ---------- 产品卡（深色金属风） ---------- */
.product-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: all .35s; text-decoration: none; display: block;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.product-card .pc-img { position: relative; overflow: hidden; }
.product-card .pc-img img { width: 100%; aspect-ratio: 16/10.5; object-fit: cover; transition: transform .5s; }
.product-card:hover .pc-img img { transform: scale(1.06); }
.pc-flag {
  position: absolute; top: 14px; left: 14px;
  padding: 5px 13px; border-radius: 6px;
  background: rgba(23,25,29,.88); border: 1px solid rgba(217,164,65,.4);
  color: var(--gold); font-size: 12px; font-weight: 700; letter-spacing: 1px;
}
.product-card .pc-body { padding: 22px 24px 26px; }
.product-card h3 { font-size: 17.5px; margin-bottom: 8px; display: flex; justify-content: space-between; align-items: center; }
.product-card h3 i { color: var(--gold-deep); font-size: 14px; transition: transform .3s; }
.product-card:hover h3 i { transform: translateX(4px); }
.product-card p { font-size: 14px; color: var(--ink-2); }

/* ---------- 牌号标签墙 ---------- */
.grade-wall { display: flex; flex-wrap: wrap; gap: 13px; }
.grade-chip {
  padding: 11px 22px; border-radius: 8px;
  background: var(--navy-3); border: 1px solid var(--line-dark);
  color: var(--steel); font-size: 15px; font-weight: 700; letter-spacing: 1px;
  transition: all .3s; cursor: default;
}
.grade-chip:hover {
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  color: #1d1405; border-color: transparent; transform: translateY(-3px);
  box-shadow: 0 8px 18px rgba(217, 164, 65, .3);
}
.grade-note { margin-top: 26px; font-size: 14px; color: rgba(255,255,255,.55); display: flex; align-items: center; gap: 9px; }
.grade-note i { color: var(--gold); }

/* ---------- split 图文 ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 66px; align-items: center; }
.split.reverse .split-media { order: 2; }
.split-media { position: relative; }
.split-media > img { border-radius: var(--radius); box-shadow: var(--shadow-lg); width: 100%; }
.split-media .float-img {
  position: absolute; right: -26px; bottom: -30px; width: 46%;
  border-radius: 10px; border: 5px solid #fff; box-shadow: var(--shadow-lg);
}
.split-body h2 { font-size: 32px; margin-bottom: 16px; letter-spacing: .5px; }
.split-body .lead { color: var(--ink-2); font-size: 16px; margin-bottom: 24px; }
.section-dark .split-body .lead { color: rgba(255,255,255,.7); }

/* 金属大数字卡 */
.metal-card {
  border-radius: var(--radius); padding: 34px 30px;
  background: linear-gradient(150deg, #2b3038 0%, #17191d 80%);
  border: 1px solid var(--line-dark); color: #fff;
  box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
}
.metal-card::before {
  content: ""; position: absolute; inset: 0;
  background: repeating-linear-gradient(115deg, rgba(255,255,255,.025) 0 2px, transparent 2px 6px);
}
.metal-card .mc-num { font-size: 46px; font-weight: 800; color: var(--gold); letter-spacing: 1px; position: relative; }
.metal-card .mc-num small { font-size: 18px; font-weight: 700; }
.metal-card .mc-lbl { font-size: 15px; color: rgba(255,255,255,.72); margin-top: 6px; position: relative; }
.metal-card .mc-desc { font-size: 13.5px; color: rgba(255,255,255,.5); margin-top: 14px; position: relative; }

/* ---------- 勾选清单 ---------- */
.check-list { list-style: none; display: grid; gap: 13px; margin-bottom: 30px; }
.check-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 15.5px; }
.check-list li i {
  flex-shrink: 0; width: 22px; height: 22px; margin-top: 2px;
  background: var(--gold-soft); color: var(--gold-deep);
  border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 11px;
}
.section-dark .check-list li { color: rgba(255,255,255,.85); }
.section-dark .check-list li i { background: rgba(217,164,65,.16); color: var(--gold); }
.check-list b { color: inherit; }

/* ---------- 深色服务卡 ---------- */
.svc-card {
  background: var(--navy-3); border: 1px solid var(--line-dark);
  border-radius: var(--radius); padding: 34px 28px; transition: all .35s;
}
.svc-card:hover { transform: translateY(-6px); border-color: rgba(217,164,65,.45); box-shadow: 0 18px 40px rgba(0,0,0,.4); }
.svc-card .feature-icon { margin-bottom: 18px; }
.svc-card h3 { font-size: 18px; color: #fff; margin-bottom: 10px; }
.svc-card p { font-size: 14px; color: rgba(255,255,255,.62); }
.svc-card .check-list { margin: 16px 0 0; gap: 9px; }
.svc-card .check-list li { font-size: 13.5px; }

/* ---------- 视频模块 ---------- */
.video-wrap {
  position: relative; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-lg); border: 1px solid var(--line-dark);
}
.video-wrap video { width: 100%; display: block; aspect-ratio: 16/8.5; object-fit: cover; background: #000; }
.video-badge {
  position: absolute; top: 18px; left: 18px; z-index: 2;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: rgba(23,25,29,.85); border: 1px solid rgba(217,164,65,.4); color: var(--gold);
}
.video-badge i { font-size: 10px; color: #ff5f57; animation: blink 1.6s infinite; }
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: .25; } }

/* ---------- 应用卡 ---------- */
.app-card {
  position: relative; border-radius: var(--radius); overflow: hidden;
  aspect-ratio: 4/3; box-shadow: var(--shadow);
}
.app-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.app-card:hover img { transform: scale(1.07); }
.app-card::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 38%, rgba(18,20,24,.92) 100%);
}
.app-label { position: absolute; left: 20px; right: 20px; bottom: 18px; z-index: 2; color: #fff; }
.app-label b { display: block; font-size: 17px; }
.app-label span { font-size: 13px; color: rgba(255,255,255,.72); }

/* ---------- 表格 ---------- */
.spec-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.spec-table th {
  background: linear-gradient(135deg, #2b3038, #17191d); color: var(--gold);
  font-size: 14px; letter-spacing: 1px; padding: 15px 20px; text-align: left;
}
.spec-table td { padding: 14px 20px; font-size: 14.5px; border-top: 1px solid var(--line); }
.spec-table tbody tr:hover { background: var(--gold-soft); }

/* ---------- CTA ---------- */
.cta-band {
  position: relative; border-radius: var(--radius); overflow: hidden;
  background: linear-gradient(120deg, #2b3038 0%, #17191d 70%);
  border: 1px solid rgba(217,164,65,.35);
  padding: 56px 60px; color: #fff;
  display: flex; align-items: center; justify-content: space-between; gap: 40px; flex-wrap: wrap;
}
.cta-band::before {
  content: "\f0a4"; font-family: "Font Awesome 6 Free"; font-weight: 900;
  position: absolute; right: -20px; bottom: -50px; font-size: 200px;
  color: rgba(217,164,65,.07); transform: rotate(12deg);
}
.cta-band h2 { font-size: 30px; margin-bottom: 10px; }
.cta-band p { color: rgba(255,255,255,.68); max-width: 480px; }
.cta-phone { display: flex; align-items: center; gap: 16px; position: relative; z-index: 2; }
.cta-phone .p-icon {
  width: 56px; height: 56px; border-radius: 50%;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  display: flex; align-items: center; justify-content: center;
  color: #1d1405; font-size: 21px; flex-shrink: 0;
  box-shadow: 0 10px 24px rgba(217,164,65,.4);
}
.cta-phone span { font-size: 13px; color: rgba(255,255,255,.6); display: block; }
.cta-phone b { font-size: 22px; letter-spacing: .5px; color: #fff; display: block; line-height: 1.4; }
.cta-actions { display: flex; gap: 14px; position: relative; z-index: 2; flex-wrap: wrap; }

/* ---------- 页面横幅（子页） ---------- */
.page-banner {
  padding: calc(var(--header-h) + 66px) 0 66px;
  background:
    radial-gradient(ellipse 500px 260px at 80% 20%, rgba(217,164,65,.12), transparent),
    linear-gradient(140deg, #22262c 0%, #17191d 100%);
  color: #fff; position: relative; overflow: hidden;
}
.page-banner::after {
  content: ""; position: absolute; inset: 0;
  background: repeating-linear-gradient(115deg, rgba(255,255,255,.018) 0 2px, transparent 2px 7px);
}
.page-banner .container { position: relative; z-index: 2; }
.page-banner h1 { font-size: 38px; letter-spacing: 1px; margin-bottom: 12px; }
.page-banner .banner-sub { color: rgba(255,255,255,.65); font-size: 16px; max-width: 640px; }
.breadcrumb { display: flex; align-items: center; gap: 10px; font-size: 13.5px; color: rgba(255,255,255,.55); margin-bottom: 18px; }
.breadcrumb a { color: var(--gold); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb i { font-size: 10px; }

/* ---------- 图库卡 ---------- */
.gallery-card { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); position: relative; }
.gallery-card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; transition: transform .5s; }
.gallery-card:hover img { transform: scale(1.06); }
.gallery-card .g-label {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 26px 16px 12px;
  background: linear-gradient(180deg, transparent, rgba(18,20,24,.85));
  color: #fff; font-size: 13.5px; font-weight: 600;
}

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 30px; align-items: start; }
.contact-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 26px; display: flex; gap: 18px; align-items: flex-start; transition: all .3s;
}
.contact-card:hover { border-color: rgba(217,164,65,.5); box-shadow: var(--shadow); }
.contact-card .c-icon {
  width: 48px; height: 48px; border-radius: 12px; flex-shrink: 0;
  background: linear-gradient(145deg, #2b3038, #17191d);
  border: 1px solid rgba(217,164,65,.3);
  display: flex; align-items: center; justify-content: center; color: var(--gold); font-size: 18px;
}
.contact-card h3 { font-size: 16.5px; margin-bottom: 4px; }
.contact-card p, .contact-card a { font-size: 15px; color: var(--ink-2); text-decoration: none; }
.contact-card a:hover { color: var(--gold-deep); }
.contact-card a.tel { font-size: 19px; font-weight: 700; color: var(--navy); letter-spacing: .5px; }
.contact-card .qr-img { width: 128px; border-radius: 8px; border: 1px solid var(--line); }
.form-panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 40px 42px; box-shadow: var(--shadow); }
.form-panel h3 { font-size: 22px; margin-bottom: 6px; }
.form-panel .fp-sub { font-size: 14px; color: var(--ink-2); margin-bottom: 28px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.form-group label i { color: var(--gold-deep); font-style: normal; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 15px; border: 1.5px solid var(--line); border-radius: 8px;
  font-size: 15px; font-family: inherit; transition: border .25s; background: #fbfbfc;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--gold); background: #fff;
}
.form-group textarea { resize: vertical; min-height: 110px; }
.form-submit { width: 100%; justify-content: center; font-size: 16px; padding: 15px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #14161a; color: rgba(255,255,255,.72); }
.footer-main {
  max-width: 1180px; margin: 0 auto; padding: 70px 24px 46px;
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 46px;
}
.footer-brand .f-logo { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.footer-brand .f-logo b { color: #fff; font-size: 17px; letter-spacing: 1px; }
.footer-brand p { font-size: 14px; line-height: 1.85; color: rgba(255,255,255,.55); }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 18px; position: relative; padding-bottom: 10px; }
.footer-col h4::after { content: ""; position: absolute; left: 0; bottom: 0; width: 26px; height: 2.5px; background: var(--gold); border-radius: 2px; }
.footer-col ul { list-style: none; display: grid; gap: 11px; }
.footer-col a { color: rgba(255,255,255,.62); text-decoration: none; font-size: 14.5px; transition: all .25s; }
.footer-col a:hover { color: var(--gold); padding-left: 4px; }
.footer-contact li { display: flex; gap: 11px; align-items: flex-start; font-size: 14.5px; color: rgba(255,255,255,.62); }
.footer-contact i { color: var(--gold); margin-top: 5px; font-size: 13px; }
.footer-contact a { color: #fff; font-weight: 600; font-size: 16px; letter-spacing: .5px; }
.footer-contact a:hover { color: var(--gold); padding-left: 0; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 20px 24px; text-align: center;
  font-size: 13px; color: rgba(255,255,255,.4);
  display: flex; align-items: center; justify-content: center;
  gap: 8px 18px; flex-wrap: wrap;
}
.footer-record a { color: inherit; text-decoration: none; transition: color .25s; }
.footer-record a:hover { color: var(--gold); }

/* ---------- 五步流程 ---------- */
.flow-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.flow-5 .feature-card { padding: 26px 18px; text-align: center; }
.flow-5 .feature-card .feature-icon { margin-left: auto; margin-right: auto; }

/* ---------- 新闻卡片 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
a.news-card, .news-card { display: flex; flex-direction: column; text-decoration: none; color: inherit; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
a.news-card:hover, .news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--gold); }
.news-thumb { aspect-ratio: 16/10; overflow: hidden; }
.news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
a.news-card:hover .news-thumb img { transform: scale(1.06); }
.news-body { padding: 20px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.news-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; font-size: 13px; color: var(--muted); }
.news-cat { background: var(--gold); color: #fff; padding: 2px 10px; border-radius: 4px; font-size: 12px; }
.news-body h2, .news-body h3 { font-size: 17px; line-height: 1.5; margin-bottom: 10px; }

/* ---------- 可抽取答案与常见问题 ---------- */
.geo-overview { padding-top: 72px; }
.answer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 0; }
.answer-card { padding: 26px; border: 1px solid var(--line); border-top: 3px solid var(--gold); border-radius: var(--radius); background: #fff; }
.answer-card dt { margin-bottom: 10px; color: var(--ink); font-size: 17px; font-weight: 700; }
.answer-card dd { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.8; }
.faq-shell { max-width: 900px; }
.faq-list { display: grid; gap: 14px; }
.faq-item { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; overflow: hidden; }
.faq-item summary { position: relative; padding: 20px 58px 20px 22px; color: var(--ink); font-size: 16px; font-weight: 700; cursor: pointer; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; top: 50%; right: 22px; color: var(--gold); font-size: 24px; font-weight: 400; transform: translateY(-50%); }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 0; padding: 0 22px 20px; color: var(--muted); font-size: 15px; line-height: 1.8; }

/* ---------- 键盘与辅助技术 ---------- */
.skip-link { position: fixed; z-index: 10000; top: 10px; left: 10px; padding: 10px 14px; border-radius: 6px; background: var(--gold); color: #161616; font-weight: 700; text-decoration: none; transform: translateY(-150%); transition: transform .2s ease; }
.skip-link:focus { transform: translateY(0); }
.footer-col address { font-style: normal; }
.news-body p { font-size: 14px; color: var(--muted); line-height: 1.7; flex: 1; }
.news-more { margin-top: 14px; font-size: 13px; color: var(--gold); font-weight: 600; letter-spacing: 1px; }
.news-tabs { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 36px; }
.news-tab { padding: 8px 20px; border-radius: 999px; border: 1px solid var(--line); background: #fff; color: var(--ink); font-size: 14px; cursor: pointer; transition: all .2s ease; font-family: inherit; }
.news-tab:hover { border-color: var(--gold); color: var(--gold); }
.news-tab.active { background: var(--gold); border-color: var(--gold); color: #fff; }

/* ---------- 新闻详情页 ---------- */
.article-wrap { max-width: 820px; margin: 0 auto; }
.article-hero { border-radius: var(--radius); overflow: hidden; margin-bottom: 40px; box-shadow: var(--shadow); }
.article-hero img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.article-body p { font-size: 16px; line-height: 1.9; color: #3a4048; margin-bottom: 18px; }
.article-body h2 { font-size: 20px; margin: 38px 0 16px; padding-left: 14px; border-left: 4px solid var(--gold); }
.article-body ul { margin: 0 0 20px; padding: 0; list-style: none; }
.article-body ul li { position: relative; padding: 8px 0 8px 22px; font-size: 15px; line-height: 1.8; color: #3a4048; }
.article-body ul li::before { content: ""; position: absolute; left: 4px; top: 16px; width: 7px; height: 7px; border-radius: 50%; background: var(--gold); }
.article-body ol { margin: 0 0 20px; padding-left: 24px; }
.article-body ol li { padding: 6px 0 6px 4px; font-size: 15px; line-height: 1.8; color: #3a4048; }
.article-body img { display: block; max-width: 100%; height: auto; margin: 28px auto; border-radius: 8px; }
.article-body blockquote { margin: 28px 0; padding: 18px 22px; border-left: 4px solid var(--gold); background: var(--gold-soft); color: #3a4048; line-height: 1.8; }
.article-body table { width: 100%; margin: 24px 0; border-collapse: collapse; font-size: 15px; }
.article-body th, .article-body td { padding: 12px 14px; border: 1px solid var(--line); text-align: left; line-height: 1.6; }
.article-body th { background: var(--gold-soft); font-weight: 600; }
.article-body a { color: var(--gold); text-decoration: underline; text-underline-offset: 3px; }
.article-tip { background: var(--gold-soft); border-left: 4px solid var(--gold); border-radius: 0 8px 8px 0; padding: 18px 22px; margin: 28px 0; font-size: 15px; line-height: 1.8; color: #3a4048; }
.article-tip i { color: var(--gold); margin-right: 8px; }
.article-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 48px; border-top: 1px solid var(--line); padding-top: 32px; }
.article-nav a { display: block; padding: 20px 22px; border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; color: var(--ink); transition: all .2s ease; background: #fff; }
.article-nav a:hover { border-color: var(--gold); box-shadow: var(--shadow); }
.article-nav a.empty { visibility: hidden; }
.article-nav .an-label { display: block; font-size: 12px; color: var(--gold); font-weight: 600; letter-spacing: 1px; margin-bottom: 8px; }
.article-nav .an-title { font-size: 15px; font-weight: 600; line-height: 1.5; }
.article-nav a.next { text-align: right; }

/* ---------- 滚动动画 ---------- */
.fade-in-up { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.fade-in-up.visible { opacity: 1; transform: none; }

/* ---------- 金属表面动态光效（独立增强层，不参与布局） ---------- */
.metal-surface {
  position: relative;
  isolation: isolate;
}
.metal-surface--clipped { overflow: hidden; }
.metal-glint,
.metal-spotlight {
  position: absolute;
  display: block;
  pointer-events: none;
  user-select: none;
}
.metal-glint {
  z-index: 4;
  top: -32%; bottom: -32%; left: -58%;
  width: 38%;
  opacity: 0;
  transform: translate3d(-20%, 0, 0) skewX(-18deg);
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255,255,255,.025) 23%,
    rgba(218,228,236,.22) 48%,
    rgba(255,255,255,.05) 68%,
    transparent 100%
  );
  mix-blend-mode: screen;
  will-change: transform, opacity;
}
.metal-surface--ambient.is-metal-visible .metal-glint {
  animation: metal-glint 7.8s cubic-bezier(.42, 0, .24, 1) var(--metal-delay, 0s) infinite;
}
.metal-surface--compact .metal-glint {
  top: -55%; bottom: -55%;
  width: 46%;
}
@media (hover: hover) and (pointer: fine) {
  .metal-surface--compact:hover .metal-glint {
    animation: metal-glint-once .9s cubic-bezier(.2, .7, .2, 1) both;
  }
}
.metal-spotlight {
  z-index: 3;
  left: 0; top: 0;
  width: 240px; height: 240px;
  border-radius: 50%;
  opacity: 0;
  transform: translate3d(-120px, -120px, 0);
  background: radial-gradient(circle, rgba(209,222,232,.16) 0%, rgba(217,164,65,.055) 34%, transparent 70%);
  mix-blend-mode: screen;
  transition: opacity .28s ease;
  will-change: transform, opacity;
}
@media (hover: hover) and (pointer: fine) {
  .metal-surface--reactive:hover .metal-spotlight { opacity: 1; }
}
.metal-motion-paused .metal-glint { animation-play-state: paused !important; }

@keyframes metal-glint {
  0%, 16% { opacity: 0; transform: translate3d(-20%, 0, 0) skewX(-18deg); }
  20% { opacity: .2; }
  34% { opacity: .12; transform: translate3d(420%, 0, 0) skewX(-18deg); }
  38%, 100% { opacity: 0; transform: translate3d(420%, 0, 0) skewX(-18deg); }
}
@keyframes metal-glint-once {
  0% { opacity: 0; transform: translate3d(-20%, 0, 0) skewX(-18deg); }
  24% { opacity: .28; }
  100% { opacity: 0; transform: translate3d(420%, 0, 0) skewX(-18deg); }
}

@media (prefers-reduced-motion: reduce) {
  .metal-glint,
  .metal-spotlight { display: none !important; animation: none !important; transition: none !important; }
}

/* ---------- 响应式 1024 ---------- */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; gap: 46px; }
  .hero h1 { font-size: 38px; }
  .hero-card { max-width: 620px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .split { gap: 44px; }
  .stat-band .num { font-size: 28px; }
  .flow-5 { grid-template-columns: repeat(3, 1fr); }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .answer-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- 响应式 640 ---------- */
@media (max-width: 640px) {
  :root { --header-h: 60px; }
  .header-inner { gap: 10px; padding: 0 14px; }
  .logo-mark { width: 32px; height: 32px; font-size: 14px; }
  .logo-text strong { font-size: 15px; }
  .logo-text span { display: none; }
  .main-nav {
    display: none; position: absolute; top: var(--header-h); left: 0; right: 0;
    background: rgba(23,25,29,.98); flex-direction: column; padding: 12px;
    border-bottom: 1px solid rgba(217,164,65,.25); gap: 2px;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 14px; border-radius: 8px; }
  .main-nav a:hover { background: rgba(255,255,255,.06); }
  .nav-toggle { display: flex; align-items: center; justify-content: center; margin-left: auto; width: 38px; height: 38px; }
  .header-cta { display: none; }

  .hero { min-height: 0; padding: calc(var(--header-h) + 44px) 0 88px; }
  .hero h1 { font-size: 28px; }
  .hero .lead { font-size: 15px; margin-bottom: 26px; }
  .hero-actions .btn { flex: 1; justify-content: center; }
  .hero-points { gap: 14px; }
  .hero-card .hc-tag { left: 12px; right: 12px; bottom: 12px; padding: 13px 16px; }
  .hero-card .hc-tag b { font-size: 19px; }

  .stat-band { grid-template-columns: repeat(2, 1fr); margin-top: -42px; }
  .stat-band .stat { padding: 20px 12px; }
  .stat-band .num { font-size: 24px; }

  .section { padding: 60px 0; }
  .sec-head { flex-direction: column; align-items: flex-start; margin-bottom: 36px; }
  .sec-head h2 { font-size: 25px; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 34px; }
  .split.reverse .split-media { order: 0; }
  .split-media .float-img { right: 0; bottom: -22px; }
  .split-body h2 { font-size: 24px; }
  .metal-card .mc-num { font-size: 34px; }
  .flow-5 { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .grade-chip { padding: 9px 16px; font-size: 13.5px; }
  .cta-band { padding: 38px 26px; }
  .cta-band h2 { font-size: 22px; }
  .cta-phone b { font-size: 18px; }
  .page-banner h1 { font-size: 26px; }
  .form-panel { padding: 26px 20px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: 34px; padding: 48px 24px 34px; }
  .spec-table { font-size: 13px; display: block; overflow-x: auto; }
  .video-wrap video { aspect-ratio: 16/10; }
  .news-grid { grid-template-columns: 1fr; }
  .article-head h1 { font-size: 22px !important; }
  .article-nav { grid-template-columns: 1fr; }
  .article-hero { margin-bottom: 28px; }
  .news-tabs { gap: 8px; }
  .news-tab { padding: 7px 14px; font-size: 13px; }
  .answer-grid { grid-template-columns: 1fr; }
  .answer-card { padding: 22px; }
  .faq-item summary { padding: 18px 52px 18px 18px; }
  .faq-item p { padding: 0 18px 18px; }
}