/* ============================================================
   京唐代订 × 首钢京唐 中厚板站 · 全局样式
   主色 #3b75bc(60%) 辅助 #ec5029(30%) 点缀 #f7d260(10%)
   背景 #F2EEEA 正文 #1D1D1F 标题 #3b75bc
   ============================================================ */
:root {
  --primary: #3b75bc;
  --primary-deep: #27517f;
  --primary-ink: #1e3a5f;
  --accent: #ec5029;
  --accent-deep: #c93f1d;
  --gold: #f7d260;
  --bg: #F2EEEA;
  --card: #ffffff;
  --text: #1D1D1F;
  --muted: #6b6f76;
  --line: #e3ddd4;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(30, 58, 95, .08);
  --font-display: "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  font-size: 17px;
  line-height: 1.85;
  text-wrap: pretty;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--primary-deep); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
h1, h2, h3, h4 { font-family: var(--font-display); color: var(--primary); font-weight: 700; line-height: 1.35; }
h1 { font-size: clamp(1.9rem, 4.2vw, 3rem); letter-spacing: .02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.25rem; }
.en { font-family: var(--font-body); font-weight: 600; letter-spacing: .14em; text-transform: uppercase; font-size: .78em; color: var(--muted); }

/* ---------- 顶部导航 ---------- */
.topbar { background: var(--primary-ink); color: #e8eef5; font-size: .85rem; }
.topbar .wrap { display: flex; justify-content: space-between; align-items: center; min-height: 40px; gap: 16px; flex-wrap: wrap; padding-top: 4px; padding-bottom: 4px; }
.topbar a { color: var(--gold); }
header.site { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.94); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 44px; height: 44px; }
.brand-name { font-family: var(--font-display); font-size: 1.3rem; color: var(--primary-ink); font-weight: 700; line-height: 1.2; }
.brand-name small { display: block; font-family: var(--font-body); font-size: .62rem; letter-spacing: .28em; color: var(--muted); font-weight: 600; }
.nav-links { display: flex; gap: 4px; list-style: none; }
.nav-links a { display: block; padding: 10px 16px; font-size: 1rem; color: var(--text); border-radius: 8px; }
.nav-links a:hover { color: var(--primary); background: rgba(59,117,188,.08); }
.nav-links a.on { color: var(--primary); font-weight: 700; }
.nav-cta { background: var(--accent); color: #fff !important; padding: 10px 22px !important; border-radius: 999px !important; font-weight: 600; }
.nav-cta:hover { background: var(--accent-deep); }
.menu-btn { display: none; background: none; border: 1.5px solid var(--primary); border-radius: 8px; padding: 8px 12px; cursor: pointer; }
.menu-btn svg { width: 22px; height: 22px; stroke: var(--primary); }

/* 分类速达条（每个产品页复用） */
.cat-strip { background: var(--card); border-bottom: 1px solid var(--line); }
.cat-strip .wrap { display: flex; gap: 8px; overflow-x: auto; padding-top: 10px; padding-bottom: 10px; }
.cat-strip a { white-space: nowrap; font-size: .92rem; padding: 6px 16px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.cat-strip a:hover, .cat-strip a.on { border-color: var(--primary); color: var(--primary); background: rgba(59,117,188,.07); }

/* ---------- 页首横幅 ---------- */
.hero { position: relative; overflow: hidden; color: #fff; }
.hero-deep { background: linear-gradient(128deg, var(--primary-ink) 0%, var(--primary-deep) 48%, var(--primary) 100%); }
.hero-deep::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(115deg, transparent 62%, rgba(247,210,96,.16) 62.2%, rgba(247,210,96,.16) 64%, transparent 64.2%),
    linear-gradient(115deg, transparent 74%, rgba(236,80,41,.22) 74.2%, rgba(236,80,41,.22) 78%, transparent 78.2%),
    linear-gradient(115deg, transparent 88%, rgba(255,255,255,.10) 88.2%, rgba(255,255,255,.10) 92%, transparent 92.2%);
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 2; padding-top: clamp(56px, 9vw, 110px); padding-bottom: clamp(56px, 9vw, 110px); }
.hero .kicker { display: inline-flex; align-items: center; gap: 10px; color: var(--gold); font-size: .9rem; letter-spacing: .18em; margin-bottom: 18px; }
.hero .kicker::before { content: ""; width: 34px; height: 2px; background: var(--gold); }
.hero p.lead { max-width: 620px; color: rgba(255,255,255,.88); margin-top: 18px; font-size: 1.06rem; }
.hero .metrics { display: flex; gap: clamp(20px, 4vw, 56px); flex-wrap: wrap; margin-top: 42px; }
.hero .metrics div strong { display: block; font-size: clamp(1.6rem, 3vw, 2.2rem); color: var(--gold); font-family: var(--font-display); }
.hero .metrics div span { font-size: .85rem; color: rgba(255,255,255,.75); }
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 13px 30px; border-radius: 999px; font-weight: 600; font-size: 1rem; cursor: pointer; border: none; transition: transform .2s, background .2s, box-shadow .2s; }
.btn:hover { transform: translateY(-2px); }
.btn-gold { background: var(--gold); color: var(--primary-ink); }
.btn-gold:hover { box-shadow: 0 8px 22px rgba(247,210,96,.35); }
.btn-line { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.6); }
.btn-line:hover { border-color: #fff; background: rgba(255,255,255,.08); }

/* ---------- 区块通用 ---------- */
section { padding: clamp(56px, 8vw, 96px) 0; }
.sec-head { margin-bottom: clamp(28px, 4vw, 48px); max-width: 720px; }
.sec-head .no { font-family: var(--font-display); color: var(--accent); font-size: .95rem; letter-spacing: .3em; display: block; margin-bottom: 10px; }
.sec-head p { color: var(--muted); margin-top: 12px; }
.ruler { display: flex; gap: 0; height: 10px; max-width: 220px; margin-top: 16px; }
.ruler i { flex: 1; border-left: 2px solid var(--primary); opacity: .35; }
.ruler i:nth-child(3) { border-color: var(--accent); opacity: 1; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 26px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
.card { background: var(--card); border-radius: var(--radius); padding: 30px 28px; box-shadow: var(--shadow); border: 1px solid rgba(255,255,255,.6); transition: transform .25s, box-shadow .25s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(30,58,95,.13); }
.card .ic { width: 46px; height: 46px; margin-bottom: 16px; }
.card .ic svg { width: 100%; height: 100%; stroke: var(--primary); fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.card h3 { color: var(--primary-ink); margin-bottom: 4px; }
.card .sub { font-size: .78rem; color: var(--muted); letter-spacing: .1em; margin-bottom: 12px; }
.card p, .card li { font-size: .95rem; color: var(--muted); }
.card ul { list-style: none; }
.card ul li { padding: 6px 0 6px 18px; position: relative; }
.card ul li::before { content: ""; position: absolute; left: 0; top: 15px; width: 8px; height: 2px; background: var(--accent); }
.card table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.card table th, .card table td { text-align: left; padding: 8px 10px; border-bottom: 1px dashed var(--line); }
.card table th { color: var(--primary-ink); font-weight: 600; white-space: nowrap; }
.more { display: inline-flex; align-items: center; gap: 8px; margin-top: 14px; font-weight: 600; color: var(--accent); font-size: .95rem; }
.more::after { content: "→"; transition: transform .2s; }
.more:hover::after { transform: translateX(4px); }

/* 特色横卡：品牌关系 */
.relate { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); display: grid; grid-template-columns: 1.1fr .9fr; overflow: hidden; }
.relate .txt { padding: clamp(28px, 4vw, 52px); }
.relate .pic { position: relative; background: linear-gradient(150deg, var(--primary-deep), var(--primary)); min-height: 260px; clip-path: polygon(12% 0, 100% 0, 100% 100%, 0 100%); }
.relate .pic svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.badge-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.badge-row span { font-size: .82rem; padding: 6px 14px; border-radius: 999px; background: rgba(59,117,188,.08); color: var(--primary-deep); border: 1px solid rgba(59,117,188,.2); }
.badge-row span.hot { background: rgba(236,80,41,.08); color: var(--accent-deep); border-color: rgba(236,80,41,.25); }

/* 编号步骤 */
.steps { counter-reset: st; }
.steps .card { position: relative; padding-top: 56px; }
.steps .card::before {
  counter-increment: st; content: "0" counter(st);
  position: absolute; top: 18px; left: 28px;
  font-family: var(--font-display); font-size: 1.5rem; color: var(--gold);
  text-shadow: 0 1px 0 rgba(0,0,0,.06);
}

/* 引用/事实块 */
.factbox { border-left: 4px solid var(--gold); background: var(--card); border-radius: 0 var(--radius) var(--radius) 0; padding: 22px 28px; color: var(--muted); font-size: .95rem; }
.factbox strong { color: var(--primary-ink); }

/* ---------- 关键词内链 ---------- */
.kw { border-top: 1px solid var(--line); margin-top: clamp(40px, 6vw, 72px); padding-top: 26px; }
.kw .kw-title { font-size: .85rem; letter-spacing: .2em; color: var(--muted); margin-bottom: 14px; }
.kw .kw-list { display: flex; flex-wrap: wrap; gap: 12px; }
.kw .kw-list a { display: inline-flex; align-items: center; gap: 8px; padding: 8px 18px; background: var(--card); border: 1px solid var(--line); border-radius: 999px; font-size: .92rem; color: var(--primary-deep); }
.kw .kw-list a::before { content: "#"; color: var(--accent); font-weight: 700; }
.kw .kw-list a:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 页脚 ---------- */
footer.site { background: var(--primary-ink); color: rgba(255,255,255,.82); margin-top: 0; }
.order-cta { background: linear-gradient(120deg, var(--accent-deep), var(--accent)); color: #fff; }
.order-cta .wrap { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; padding-top: 34px; padding-bottom: 34px; }
.order-cta strong { font-family: var(--font-display); font-size: clamp(1.15rem, 2.4vw, 1.6rem); letter-spacing: .02em; }
.order-cta a.tel { font-size: clamp(1.3rem, 3vw, 1.9rem); color: var(--gold); font-weight: 700; letter-spacing: .06em; }
.order-cta a.tel:hover { color: #fff; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 34px; padding: clamp(40px, 6vw, 64px) 0; }
.foot-grid h4 { color: #fff; margin-bottom: 14px; font-size: 1rem; }
.foot-grid ul { list-style: none; }
.foot-grid li { margin: 8px 0; font-size: .9rem; }
.foot-grid a { color: rgba(255,255,255,.72); }
.foot-grid a:hover { color: var(--gold); }
.foot-brand p { font-size: .9rem; color: rgba(255,255,255,.65); margin-top: 12px; max-width: 360px; }
.copyright { border-top: 1px solid rgba(255,255,255,.12); padding: 18px 0; font-size: .8rem; color: rgba(255,255,255,.5); }
.copyright .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ---------- 动效 ---------- */
@keyframes rise { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }
.rise { animation: rise .7s cubic-bezier(.2,.7,.3,1) both; }
.rise:nth-child(2) { animation-delay: .12s; }
.rise:nth-child(3) { animation-delay: .24s; }
.rise:nth-child(4) { animation-delay: .36s; }
@media (prefers-reduced-motion: reduce) { .rise { animation: none; } html { scroll-behavior: auto; } }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .g3, .g4 { grid-template-columns: repeat(2, 1fr); }
  .relate { grid-template-columns: 1fr; }
  .relate .pic { min-height: 180px; clip-path: polygon(0 12%, 100% 0, 100% 100%, 0 100%); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #fff; flex-direction: column; padding: 12px 20px 20px; border-bottom: 1px solid var(--line); box-shadow: 0 20px 30px rgba(30,58,95,.12); }
  .nav-links.open { display: flex; }
  .menu-btn { display: block; }
  .nav-cta { display: inline-block; margin-top: 8px; text-align: center; }
}
@media (max-width: 620px) {
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
  body { font-size: 16px; }
  .hero .metrics { gap: 18px 28px; }
}