/* ============================================================
   浙泰金属 官网设计系统
   Industrial Precision — 冷钢配色 / 工程排版 / 极简圆角
   ============================================================ */

:root {
  --ink: #0F151A;
  --ink-2: #2A343D;
  --steel: #56636E;
  --steel-lt: #7C8894;
  --line: #DDE3E8;
  --line-2: #EDF1F4;
  --mist: #F4F6F8;
  --mist-2: #FAFBFC;
  --paper: #FFFFFF;
  --brand: #0F5C99;
  --brand-deep: #0A3E68;
  --brand-lt: #E8F1F8;
  --accent: #B87A1E;
  --dark: #10171D;
  --dark-2: #18222B;

  --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
    "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  --wrap: 1200px;
  --pad: 24px;
  --r: 2px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.72;
  color: var(--ink-2);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--brand); text-decoration: none; transition: color 0.18s var(--ease); }
a:hover { color: var(--brand-deep); }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.35em; }
li { margin-bottom: 0.45em; }
strong, b { color: var(--ink); font-weight: 600; }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }

h1, h2, h3, h4, h5 {
  margin: 0 0 0.6em;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.012em;
}
h1 { font-size: clamp(28px, 3.6vw, 44px); line-height: 1.2; }
h2 { font-size: clamp(23px, 2.6vw, 32px); }
h3 { font-size: clamp(18px, 1.6vw, 21px); }
h4 { font-size: 17px; }

/* ---------- 布局 ---------- */
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--pad); }
.wrap-narrow { max-width: 880px; }
.section { padding: 76px 0; }
.section-sm { padding: 52px 0; }
.section-mist { background: var(--mist); }
.section-line { border-top: 1px solid var(--line); }
.section-dark { background: var(--dark); color: #C3CDD6; }
.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 { color: #fff; }
.section-dark a { color: #7FB6E0; }
.section-dark a:hover { color: #fff; }
.section-dark .lead { color: #A9B6C0; }

.grid { display: grid; gap: 24px; }
.g-2 { grid-template-columns: repeat(2, 1fr); }
.g-3 { grid-template-columns: repeat(3, 1fr); }
.g-4 { grid-template-columns: repeat(4, 1fr); }
.g-side { grid-template-columns: minmax(0, 1.72fr) 340px; gap: 48px; }
.g-side > *, .g-side-rev > * { min-width: 0; }
.g-side-rev { grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); gap: 48px; }

/* ---------- 顶部信标条 ---------- */
.beacon {
  background: var(--dark);
  color: #9AA7B2;
  font-size: 12.5px;
  letter-spacing: 0.02em;
  line-height: 38px;
}
.beacon .wrap { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.beacon .wrap > div { min-width: 0; }
.beacon .beacon-left { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.beacon strong { color: #E4EBF1; font-weight: 500; }
.beacon .dot { display: inline-block; width: 5px; height: 5px; border-radius: 50%; background: #4CAF7D; margin-right: 7px; vertical-align: middle; }
.beacon a { color: #9AA7B2; }
.beacon a:hover { color: #fff; }

/* ---------- 导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
  border-top: 3px solid var(--brand);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }

.brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand-mark {
  width: 34px; height: 34px; flex: none;
  background: var(--brand);
  color: #fff;
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 15px; font-weight: 700; letter-spacing: -0.5px;
  border-radius: var(--r);
}
.brand-txt { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-size: 17px; font-weight: 700; color: var(--ink); letter-spacing: 0.04em; }
.brand-sub { font-family: var(--font-mono); font-size: 9.5px; color: var(--steel-lt); letter-spacing: 0.13em; margin-top: 3px; }

.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links > a {
  position: relative;
  display: block;
  padding: 8px 13px;
  font-size: 14.5px;
  color: var(--ink-2);
  font-weight: 500;
  border-radius: var(--r);
}
.nav-links > a:hover { color: var(--brand); background: var(--mist); }
.nav-links > a[aria-current="page"] { color: var(--brand); }
.nav-links > a[aria-current="page"]::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: 2px;
  height: 2px; background: var(--brand);
}

.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-tel { display: flex; flex-direction: column; text-align: right; line-height: 1.2; margin-right: 4px; }
.nav-tel span { font-size: 10.5px; color: var(--steel-lt); letter-spacing: 0.06em; white-space: nowrap; }
.nav-tel strong { font-family: var(--font-mono); font-size: 15px; color: var(--ink); letter-spacing: 0.01em; white-space: nowrap; }

.burger {
  display: none; width: 40px; height: 40px; border: 1px solid var(--line);
  background: #fff; border-radius: var(--r); cursor: pointer; padding: 0;
  place-items: center;
}
.burger span { display: block; width: 17px; height: 1.5px; background: var(--ink); margin: 3.5px 0; transition: 0.2s var(--ease); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px;
  font-size: 14.5px; font-weight: 600;
  border-radius: var(--r);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s var(--ease);
  white-space: nowrap;
  font-family: inherit;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-deep); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); border-color: #C7D0D8; }
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); background: #fff; }
.btn-light { background: #fff; color: var(--brand-deep); }
.btn-light:hover { background: #EAF2F9; color: var(--brand-deep); }
.btn-outline-light { border-color: rgba(255, 255, 255, 0.35); color: #fff; }
.btn-outline-light:hover { border-color: #fff; color: #fff; background: rgba(255, 255, 255, 0.08); }
.btn-lg { padding: 14px 28px; font-size: 15.5px; }
.btn-block { width: 100%; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: var(--dark);
  color: #D6DEE5;
  overflow: hidden;
}
.hero-media { position: absolute; inset: 0; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: 72% 50%; opacity: 0.38; filter: contrast(1.05); }
.hero-media::after {
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(100deg, rgba(9, 15, 20, 0.97) 0%, rgba(9, 15, 20, 0.9) 42%, rgba(9, 15, 20, 0.66) 100%);
}
.hero-inner { position: relative; z-index: 2; padding: 92px 0 84px; max-width: 720px; }
.hero h1 { color: #fff; margin-bottom: 20px; letter-spacing: -0.02em; }
.hero h1 em { font-style: normal; color: #8FC1E8; }
.hero-lead { font-size: 17px; line-height: 1.8; color: #AEBBC6; margin-bottom: 30px; max-width: 620px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 40px; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px; letter-spacing: 0.16em; text-transform: uppercase;
  color: #8FC1E8;
  margin-bottom: 20px;
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: currentColor; opacity: 0.7; }
.eyebrow-dark { color: var(--brand); }

/* hero 关键数据 */
.hero-facts {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.14);
  max-width: 660px;
}
.hero-facts div { background: rgba(8, 13, 18, 0.55); padding: 14px 16px; }
.hero-facts dt { font-family: var(--font-mono); font-size: 21px; color: #fff; font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
.hero-facts dt small { font-size: 12px; font-weight: 400; color: #93A2AE; margin-left: 2px; }
.hero-facts dd { margin: 4px 0 0; font-size: 12px; color: #94A2AE; letter-spacing: 0.04em; }

/* ---------- 内页页头 ---------- */
.page-head {
  position: relative;
  background: var(--dark); color: #B9C5CF;
  padding: 52px 0 48px;
  overflow: hidden;
}
.page-head .ph-bg { position: absolute; inset: 0; }
.page-head .ph-bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.34; }
.page-head .ph-bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(95deg, rgba(10,16,21,0.96), rgba(10,16,21,0.72)); }
.page-head .wrap { position: relative; z-index: 2; }
.page-head h1 { color: #fff; margin-bottom: 14px; max-width: 860px; }
.page-head p { color: #A6B3BE; max-width: 760px; margin-bottom: 0; font-size: 15.5px; }

.crumb { font-size: 12.5px; color: #7D8B97; margin-bottom: 18px; letter-spacing: 0.02em; }
.crumb a { color: #9DAAB6; }
.crumb a:hover { color: #fff; }
.crumb span { margin: 0 7px; opacity: 0.5; }

/* ---------- 章节标题 ---------- */
.sec-head { margin-bottom: 40px; max-width: 780px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head.center .eyebrow { justify-content: center; }
.sec-head p { color: var(--steel); font-size: 16px; margin-bottom: 0; }
.lead { font-size: 17px; line-height: 1.85; color: var(--steel); }

/* ---------- 产品卡 ---------- */
.card {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.card:hover { border-color: #B9C6D1; transform: translateY(-2px); box-shadow: 0 10px 28px rgba(15, 30, 45, 0.07); }
.card-img { aspect-ratio: 4 / 3; overflow: hidden; background: var(--mist); }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.card:hover .card-img img { transform: scale(1.035); }
.card-body { padding: 20px 22px 22px; flex: 1; display: flex; flex-direction: column; }
.card-tag {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.12em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 8px;
}
.card-body h3 { font-size: 18px; margin-bottom: 8px; }
.card-body h3 a { color: var(--ink); }
.card-body h3 a:hover { color: var(--brand); }
.card-body p { font-size: 14px; color: var(--steel); margin-bottom: 14px; line-height: 1.68; }
.card-more { margin-top: auto; font-size: 13px; font-weight: 600; color: var(--brand); display: inline-flex; align-items: center; gap: 5px; }
.card-more::after { content: "→"; transition: transform 0.2s var(--ease); }
.card:hover .card-more::after { transform: translateX(3px); }

.card-flat { background: #fff; border: 1px solid var(--line); padding: 26px 24px; border-radius: var(--r); }
.card-flat h3 { font-size: 17px; margin-bottom: 10px; }
.card-flat p { font-size: 14.5px; color: var(--steel); margin: 0; }
.num-badge {
  display: inline-block; font-family: var(--font-mono); font-size: 12px;
  color: var(--brand); letter-spacing: 0.1em; margin-bottom: 14px;
  padding-bottom: 10px; border-bottom: 1px solid var(--line); width: 100%;
}

/* ---------- 答案摘要块（GEO 核心） ---------- */
.answer-box {
  border-left: 3px solid var(--brand);
  background: var(--brand-lt);
  padding: 22px 26px;
  margin: 0 0 32px;
  border-radius: 0 var(--r) var(--r) 0;
}
.answer-box p { margin: 0; font-size: 15.5px; line-height: 1.8; color: var(--ink-2); max-width: 72ch; }
.answer-box p + p { margin-top: 10px; }
.answer-box .ab-label {
  display: block; font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--brand);
  margin-bottom: 8px;
}

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; max-width: 100%; margin: 0 0 28px; border: 1px solid var(--line); border-radius: var(--r); }
table { width: 100%; border-collapse: collapse; font-size: 14px; background: #fff; }
caption {
  caption-side: top; text-align: left; padding: 12px 16px;
  font-size: 13px; color: var(--steel); background: var(--mist-2);
  border-bottom: 1px solid var(--line);
}
th, td { padding: 11px 16px; text-align: left; border-bottom: 1px solid var(--line-2); vertical-align: top; }
thead th {
  background: var(--mist); color: var(--ink);
  font-size: 12.5px; font-weight: 600; letter-spacing: 0.04em;
  border-bottom: 1px solid var(--line); white-space: nowrap;
}
tbody th { background: var(--mist-2); font-weight: 500; color: var(--steel); font-size: 13.5px; white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #FBFCFD; }
td strong { font-weight: 600; }
.t-num { font-family: var(--font-mono); font-size: 13px; color: var(--ink); letter-spacing: -0.01em; white-space: nowrap; }

.matrix td:not(:first-child), .matrix th:not(:first-child) { text-align: center; }
.matrix td:first-child { font-weight: 600; color: var(--ink); }
.matrix tbody tr:hover { background: #F7FAFC; }
.section-dark .steps > li::before { color: #7FB6E0; }

/* ---------- 规格/参数列表 ---------- */
.spec-list { display: grid; gap: 0; border-top: 1px solid var(--line); margin: 0 0 24px; }
.spec-list > div {
  display: grid; grid-template-columns: 168px 1fr; gap: 20px;
  padding: 13px 0; border-bottom: 1px solid var(--line-2);
}
.spec-list dt { font-size: 13.5px; color: var(--steel); }
.spec-list dd { margin: 0; font-size: 14.5px; color: var(--ink); }

/* ---------- 特性列表 ---------- */
.feature { display: flex; gap: 16px; }
.feature-icon {
  flex: none; width: 40px; height: 40px; display: grid; place-items: center;
  background: var(--brand-lt); color: var(--brand);
  border-radius: var(--r);
  font-family: var(--font-mono); font-size: 14px; font-weight: 700;
}
.feature h3 { font-size: 16.5px; margin-bottom: 6px; }
.feature p { font-size: 14px; color: var(--steel); margin: 0; line-height: 1.68; }

/* ---------- 流程步骤 ---------- */
.steps { counter-reset: step; display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.steps > li {
  list-style: none; margin: 0; background: #fff; padding: 22px 24px 22px 24px;
  display: grid; grid-template-columns: 44px 1fr; gap: 18px; align-items: start;
  counter-increment: step;
}
.steps > li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  color: var(--brand); letter-spacing: 0.04em;
  padding-top: 4px;
}
.steps h3 { font-size: 16px; margin-bottom: 4px; }
.steps p { font-size: 14px; color: var(--steel); margin: 0; }

/* ---------- 采购流程：横向七步（首页） ---------- */
.flow-head { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 48px; align-items: end; }
.flow-head .eyebrow { margin-bottom: 14px; }
.flow-head h2 { margin-bottom: 0; }
.flow-lead { margin: 0 0 6px; font-size: 14px; line-height: 1.72; color: #93A1AC; }

.flow {
  counter-reset: flow; list-style: none;
  display: grid; grid-template-columns: repeat(7, minmax(0, 1fr));
  margin: 44px 0 0; padding: 0;
}
.flow > li {
  counter-increment: flow; position: relative; margin: 0;
  padding: 24px 22px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}
.flow > li:last-child { padding-right: 0; }
.flow > li::before {
  content: counter(flow, decimal-leading-zero);
  display: block; margin-bottom: 10px;
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 700;
  letter-spacing: 0.08em; color: #7FB6E0;
}
.flow > li::after {
  content: ""; position: absolute; left: 0; top: -1px;
  width: 22px; height: 2px; background: #7FB6E0;
}
.flow h3 { font-size: 16px; margin: 0 0 6px; color: #fff; letter-spacing: -0.01em; }
.flow p { font-size: 12.5px; line-height: 1.6; color: #94A2AE; margin: 0; }

.flow-notes {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 28px; margin-top: 40px;
}
.flow-notes > div { padding: 2px 0 2px 14px; border-left: 2px solid rgba(127, 182, 224, 0.5); }
.flow-notes b { display: block; font-size: 13px; font-weight: 600; color: #fff; margin-bottom: 3px; }
.flow-notes span { font-size: 12.5px; line-height: 1.6; color: #8E9CA8; }
.flow-cta { margin-top: 34px; }

/* ---------- FAQ ---------- */
.faq { border-top: 1px solid var(--line); }
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 0;
}
.faq summary {
  cursor: pointer; list-style: none;
  padding: 20px 40px 20px 0; position: relative;
  font-size: 16px; font-weight: 600; color: var(--ink);
  transition: color 0.15s var(--ease);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--brand); }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-mono); font-size: 19px; font-weight: 400; color: var(--steel-lt);
  transition: transform 0.2s var(--ease);
}
.faq details[open] summary::after { content: "−"; color: var(--brand); }
.faq details[open] summary { color: var(--brand); }
.faq .faq-a { padding: 0 44px 22px 0; font-size: 15px; color: var(--steel); line-height: 1.8; }
.faq .faq-a p { margin-bottom: 10px; }
.faq .faq-a p:last-child { margin-bottom: 0; }

/* ---------- 数据条 ---------- */
.stat-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.stat { background: #fff; padding: 26px 24px; }
.stat .v { font-family: var(--font-mono); font-size: 30px; font-weight: 700; color: var(--ink); line-height: 1.1; letter-spacing: -0.03em; }
.stat .v small { font-size: 14px; font-weight: 500; color: var(--steel); margin-left: 3px; letter-spacing: 0; }
.stat .k { font-size: 13px; color: var(--steel); margin-top: 7px; }

/* ---------- 图文区块 ---------- */
.figure { margin: 0; }
.figure img { border: 1px solid var(--line); border-radius: var(--r); }
.figure figcaption { font-size: 12.5px; color: var(--steel-lt); margin-top: 10px; line-height: 1.6; }

.media-frame { position: relative; border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; background: var(--mist); }
.media-frame img { width: 100%; }

/* ---------- 案例 ---------- */
.case {
  border: 1px solid var(--line); border-radius: var(--r); padding: 26px 26px 24px;
  background: #fff; display: flex; flex-direction: column;
}
.case .case-tag { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.1em; color: var(--accent); margin-bottom: 10px; }
.case h3 { font-size: 17px; margin-bottom: 10px; }
.case p { font-size: 14px; color: var(--steel); line-height: 1.7; }
.case dl { margin: 14px 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px 16px; padding-top: 14px; border-top: 1px solid var(--line-2); }
.case dt { font-size: 11.5px; color: var(--steel-lt); }
.case dd { margin: 2px 0 0; font-family: var(--font-mono); font-size: 15px; color: var(--brand); font-weight: 700; }

/* ---------- 图文列表（产品明细） ---------- */
.prod-row { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; padding: 40px 0; border-top: 1px solid var(--line); }
.prod-row:nth-child(even) .prod-row-media { order: 2; }
.prod-row-media img { border: 1px solid var(--line); border-radius: var(--r); width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.prod-row h3 { font-size: 21px; margin-bottom: 10px; }
.prod-row p { font-size: 14.5px; color: var(--steel); }

/* ---------- 标签 ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 20px; padding: 0; list-style: none; }
.chips li {
  margin: 0; font-size: 12.5px; color: var(--ink-2);
  background: var(--mist); border: 1px solid var(--line);
  padding: 5px 11px; border-radius: var(--r);
  font-family: var(--font-mono); letter-spacing: 0.01em;
}

/* ---------- CTA 区 ---------- */
.cta-band { background: var(--brand-deep); color: #C9DCEC; padding: 56px 0; }
.cta-band h2 { color: #fff; margin-bottom: 12px; }
.cta-band p { color: #A8C6E0; margin-bottom: 0; max-width: 620px; }
.cta-band .cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.cta-flex { display: flex; align-items: center; justify-content: space-between; gap: 40px; }

/* ---------- 联系 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 380px; gap: 48px; }
.contact-item { display: grid; grid-template-columns: 118px 1fr; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line-2); }
.contact-item dt { font-size: 13.5px; color: var(--steel); }
.contact-item dd { margin: 0; font-size: 15px; color: var(--ink); }
.contact-item dd a { font-family: var(--font-mono); font-size: 16px; font-weight: 600; }

.form-field { margin-bottom: 16px; }
.form-field label { display: block; font-size: 13px; color: var(--ink-2); margin-bottom: 6px; font-weight: 500; }
.form-field input, .form-field textarea, .form-field select {
  width: 100%; padding: 10px 13px; font-family: inherit; font-size: 14.5px;
  border: 1px solid #C9D2D9; border-radius: var(--r); background: #fff; color: var(--ink);
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
.form-field input:focus, .form-field textarea:focus, .form-field select:focus {
  outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(15, 92, 153, 0.1);
}
.form-note { font-size: 12px; color: var(--steel-lt); margin-top: 10px; line-height: 1.6; }

/* ---------- 侧栏 ---------- */
.side-nav { border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; position: sticky; top: 92px; margin-top: 20px; }
.side-nav h2 { font-size: 13px; letter-spacing: 0.06em; margin: 0; padding: 14px 18px; background: var(--mist); border-bottom: 1px solid var(--line); color: var(--steel); font-weight: 600; }
.side-nav ul { list-style: none; margin: 0; padding: 0; }
.side-nav li { margin: 0; border-bottom: 1px solid var(--line-2); }
.side-nav li:last-child { border-bottom: 0; }
.side-nav a { display: block; padding: 11px 18px; font-size: 14px; color: var(--ink-2); }
.side-nav a:hover { background: var(--mist-2); color: var(--brand); }
.side-nav a.active { color: var(--brand); font-weight: 600; background: var(--brand-lt); box-shadow: inset 2px 0 0 var(--brand); }

.side-cta { margin-top: 20px; border: 1px solid var(--line); border-radius: var(--r); padding: 22px; background: var(--mist-2); }
.side-cta h3 { font-size: 15.5px; margin-bottom: 8px; }
.side-cta p { font-size: 13px; color: var(--steel); margin-bottom: 14px; }
.side-cta .tel { font-family: var(--font-mono); font-size: 19px; font-weight: 700; color: var(--ink); display: block; margin-bottom: 1px; }
.side-cta .tel-name { display: block; font-size: 12.5px; color: var(--steel-lt); margin-bottom: 12px; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--dark); color: #93A1AC; padding: 60px 0 0; font-size: 14px; }
.footer-top { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 44px; }
.site-footer h2, .site-footer h3 { color: #fff; }
.footer-brand .brand-name { color: #fff; }
.footer-desc { font-size: 13.5px; line-height: 1.8; color: #8B99A4; margin: 16px 0 20px; max-width: 320px; }
.footer-col h3 { font-size: 13px; letter-spacing: 0.08em; margin-bottom: 16px; color: #C6D0D8; font-weight: 600; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 9px; }
.footer-col a { color: #93A1AC; font-size: 13.5px; }
.footer-col a:hover { color: #fff; }
.footer-nap { font-size: 13px; line-height: 1.9; color: #8B99A4; margin: 0; }
.footer-nap strong { color: #C6D0D8; font-weight: 500; display: block; margin-bottom: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0 24px;
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  font-size: 12.5px; color: #6F7D88;
}
.footer-bottom a { color: #6F7D88; }
.footer-bottom a:hover { color: #C6D0D8; }

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 50;
  width: 42px; height: 42px; border-radius: var(--r);
  background: var(--ink); color: #fff; border: 0; cursor: pointer;
  display: grid; place-items: center; font-size: 15px;
  opacity: 0; pointer-events: none; transition: opacity 0.25s var(--ease), background 0.2s;
}
.to-top.show { opacity: 1; pointer-events: auto; }
.to-top:hover { background: var(--brand); }

/* ---------- 滚动渐显 ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.55s var(--ease), transform 0.55s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .card:hover { transform: none; }
}

/* ---------- 双栏文字 ---------- */
.prose h2 { margin-top: 44px; padding-top: 8px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin-top: 30px; }
.prose ul, .prose ol { font-size: 15px; color: var(--ink-2); }
.prose li { line-height: 1.78; }
.prose p { font-size: 15px; line-height: 1.85; color: var(--ink-2); }
.prose .muted { color: var(--steel); font-size: 13.5px; }

.callout {
  border: 1px solid var(--line); border-left: 3px solid var(--accent);
  background: #FDFAF4; padding: 16px 20px; font-size: 14px; color: var(--ink-2);
  border-radius: 0 var(--r) var(--r) 0; margin: 24px 0;
}
.callout strong { color: var(--ink); }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .g-4 { grid-template-columns: repeat(2, 1fr); }
  .g-side, .g-side-rev { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-top { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-col:last-child { grid-column: 1 / -1; }
  .side-nav { position: static; }
  .flow-head { grid-template-columns: minmax(0, 1fr); gap: 14px; align-items: start; }
  .flow { grid-template-columns: repeat(4, minmax(0, 1fr)); row-gap: 30px; }
}

@media (max-width: 900px) {
  .flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .flow-notes { grid-template-columns: minmax(0, 1fr); gap: 16px; margin-top: 32px; }
  .nav-links { display: none; }
  .nav-tel { display: none; }
  .burger { display: grid; }
  .nav-cta .btn { display: none; }
  .nav.open .nav-links {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; left: 0; right: 0; top: 68px;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 10px 16px 16px; gap: 0;
    box-shadow: 0 14px 30px rgba(15, 30, 45, 0.1);
  }
  .nav.open .nav-links > a { padding: 12px 8px; border-bottom: 1px solid var(--line-2); }
  .nav.open .nav-links > a[aria-current="page"]::after { display: none; }
  .g-3 { grid-template-columns: 1fr 1fr; }
  .hero-inner { padding: 64px 0 60px; }
  .hero-facts { grid-template-columns: repeat(2, 1fr); }
  .stat-bar { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 56px 0; }
  .prod-row { grid-template-columns: 1fr; gap: 24px; padding: 32px 0; }
  .prod-row:nth-child(even) .prod-row-media { order: 0; }
  .cta-flex { flex-direction: column; align-items: flex-start; gap: 24px; }
  .page-head { padding: 40px 0 36px; }
}

@media (max-width: 620px) {
  :root { --pad: 18px; }
  body { font-size: 15px; }
  .g-2, .g-3, .g-4 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 24px; margin-top: 32px; }
  .flow > li { padding-right: 14px; }
  .flow-cta .btn { width: 100%; justify-content: center; }
  .beacon { font-size: 11.5px; line-height: 1.55; padding: 7px 0; }
  .beacon .wrap { justify-content: center; }
  .beacon .beacon-right { display: none; }
  .beacon-left { white-space: normal; text-align: center; overflow: visible; }
  .hero-facts { grid-template-columns: repeat(2, 1fr); }
  .stat-bar { grid-template-columns: 1fr 1fr; }
  .stat { padding: 20px 16px; }
  .stat .v { font-size: 25px; }
  .spec-list > div { grid-template-columns: 1fr; gap: 3px; }
  .contact-item { grid-template-columns: 1fr; gap: 3px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .case dl { grid-template-columns: 1fr 1fr; }
  .hero-actions .btn { flex: 1; }
  .table-wrap { font-size: 13px; -webkit-overflow-scrolling: touch; }
  .table-wrap table { min-width: 580px; }

  th, td { padding: 9px 12px; }
  .footer-bottom { flex-direction: column; gap: 8px; }
}

@media print {
  .site-header, .beacon, .to-top, .cta-band, .site-footer { display: none; }
  body { color: #000; }
  .reveal { opacity: 1; transform: none; }
}