/* ==========================================================================
   Jupintan Apparel — Global Stylesheet
   纯手写 CSS,零依赖,可离线运行
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 主色:沉稳的墨蓝,适合 B2B 制造业 */
  --ink:        #16202e;
  --ink-soft:   #3d4a5c;
  --ink-mute:   #6b7889;

  /* 强调色:低饱和青绿,纺织/采购行业的清爽感 */
  --accent:     #0f7b74;
  --accent-dark:#0a5b56;
  --accent-tint:#eef7f6;

  /* 中性色 */
  --bg:         #ffffff;
  --bg-alt:     #f6f7f9;
  --bg-dark:    #16202e;
  --line:       #e4e7ec;
  --line-strong:#cfd5de;

  /* 文字 */
  --text:       #1d2733;
  --text-soft:  #55606f;
  --text-invert:#ffffff;
  --text-invert-soft: #a9b4c2;

  /* 尺寸 */
  --wrap:       1180px;
  --radius:     10px;
  --radius-lg:  16px;

  /* 阴影 */
  --shadow-sm:  0 1px 2px rgba(22,32,46,.06);
  --shadow:     0 4px 16px rgba(22,32,46,.08);
  --shadow-lg:  0 12px 40px rgba(22,32,46,.12);

  /* 字体:全部使用系统字体,保证离线可用、加载零延迟 */
  --font: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;

  /* 过渡 */
  --t: .22s cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg, video { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); text-decoration: none; transition: color var(--t); }
a:hover { color: var(--accent-dark); }

h1, h2, h3, h4 {
  margin: 0 0 .6em;
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: -.015em;
  color: var(--ink);
}

h1 { font-size: clamp(1.9rem, 4.4vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.15rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0 0 1em; padding-left: 1.25em; }
li { margin-bottom: .4em; }

hr { border: 0; border-top: 1px solid var(--line); margin: 3rem 0; }

::selection { background: var(--accent); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ---------- 3. 布局工具类 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 24px;
}

.section { padding: 84px 0; }
.section--tight { padding: 56px 0; }
.section--alt { background: var(--bg-alt); }
.section--dark { background: var(--bg-dark); color: var(--text-invert-soft); }
.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 { color: var(--text-invert); }

.grid { display: grid; gap: 28px; }
.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)); }

.center { text-align: center; }
.mx-auto { margin-inline: auto; }
.narrow { max-width: 760px; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

.section-head {
  max-width: 720px;
  margin-bottom: 52px;
}
.section-head.center { margin-inline: auto; text-align: center; }
.section-head p {
  font-size: 1.06rem;
  color: var(--text-soft);
  margin-bottom: 0;
}
.section--dark .section-head p { color: var(--text-invert-soft); }

/* 小标签 */
.eyebrow {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .9rem;
}
.section--dark .eyebrow { color: #5ec9c1; }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  font-size: .95rem;
  line-height: 1.2;
  cursor: pointer;
  text-align: center;
  transition: background var(--t), color var(--t), border-color var(--t), transform var(--t), box-shadow var(--t);
}
.btn:active { transform: translateY(1px); }

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

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn--ghost:hover {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}

.btn--light {
  background: #fff;
  color: var(--ink);
}
.btn--light:hover { background: #eef1f4; color: var(--ink); }

.btn--outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.35);
}
.btn--outline-light:hover {
  background: #fff;
  color: var(--ink);
  border-color: #fff;
}

.btn--lg { padding: 16px 34px; font-size: 1rem; }
.btn--block { width: 100%; }

/* ---------- 5. 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 800;
  font-size: 1.06rem;
  letter-spacing: -.02em;
  color: var(--ink);
  flex-shrink: 0;
}
.brand:hover { color: var(--ink); }

.brand__mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: -.03em;
  flex-shrink: 0;
}
.brand__sub {
  display: block;
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-mute);
  line-height: 1.3;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__links a {
  display: block;
  padding: 9px 13px;
  border-radius: 8px;
  font-size: .93rem;
  font-weight: 500;
  color: var(--ink-soft);
  transition: background var(--t), color var(--t);
}
.nav__links a:hover { background: var(--bg-alt); color: var(--ink); }
.nav__links a[aria-current="page"] { color: var(--ink); font-weight: 650; }

.nav__actions { display: flex; align-items: center; gap: 10px; }

.nav__toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  place-items: center;
}
.nav__toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  position: relative;
  transition: background var(--t);
}
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transition: transform var(--t);
}
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after  { top: 6px; }

/* ---------- 6. 首页 Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 88px;
  background:
    radial-gradient(1100px 520px at 78% -12%, var(--accent-tint) 0%, transparent 62%),
    linear-gradient(180deg, #fbfcfd 0%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: 64px;
  align-items: center;
}
.hero h1 { margin-bottom: 20px; }
.hero__lead {
  font-size: 1.12rem;
  color: var(--text-soft);
  max-width: 56ch;
  margin-bottom: 30px;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 34px; }

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.hero__stat strong {
  display: block;
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -.02em;
  line-height: 1.15;
}
.hero__stat span {
  font-size: .86rem;
  color: var(--ink-mute);
}

/* Hero 视觉:纯 CSS 占位,替换为真实图片时可换成 <img> */
.hero__visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 14px;
  aspect-ratio: 1 / 1.04;
}
.hero__visual .tile {
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, #e8ecef 0%, #d7dde3 100%);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.hero__visual .tile:nth-child(1) { grid-row: span 2; background: linear-gradient(160deg, #dbe3e8 0%, #c3cfd8 100%); }
.hero__visual .tile:nth-child(2) { background: linear-gradient(150deg, var(--accent-tint) 0%, #cfe6e3 100%); }
.hero__visual .tile:nth-child(3) { background: linear-gradient(150deg, #eef0f2 0%, #dde2e7 100%); }

/* 后台绑定的真实图片:铺满图块并裁切 */
.hero__visual .tile > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
/* 有图时隐藏占位文字标签 */
.hero__visual .tile:has(> img)::after { display: none; }
.hero__visual .tile::after {
  content: attr(data-label);
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(22,32,46,.42);
}

/* ---------- 7. 信任条 ---------- */
.trustbar {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  background: var(--bg-alt);
}
.trustbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px 34px;
}
.trustbar__label {
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.trustbar__logos {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px 30px;
}
.trustbar__logos span {
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: #9aa4b2;
  transition: color var(--t);
}
.trustbar__logos span:hover { color: var(--ink-soft); }

/* ---------- 8. 卡片:产品分类 ---------- */
.cat-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--t), box-shadow var(--t), border-color var(--t);
}
.cat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--line-strong);
}
.cat-card__media {
  aspect-ratio: 4 / 3;
  background: linear-gradient(150deg, #eceff2 0%, #dbe1e6 100%);
  position: relative;
  overflow: hidden;
}
.cat-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cat-card__badge {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.94);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--ink);
}
.cat-card__body { padding: 20px 22px 24px; flex: 1; display: flex; flex-direction: column; }
.cat-card__body h3 { margin-bottom: .35em; font-size: 1.12rem; }
.cat-card__body p { font-size: .92rem; color: var(--text-soft); margin-bottom: 14px; }
.cat-card__link {
  margin-top: auto;
  font-size: .9rem;
  font-weight: 650;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.cat-card__link::after { content: "→"; transition: transform var(--t); }
.cat-card:hover .cat-card__link::after { transform: translateX(4px); }

/* ---------- 9. 特性列表 ---------- */
.feature {
  padding: 28px 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color var(--t), box-shadow var(--t);
}
.feature:hover { border-color: var(--line-strong); box-shadow: var(--shadow); }
.feature__icon {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  background: var(--accent-tint);
  color: var(--accent-dark);
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  font-size: 1.15rem;
}
.feature h3 { font-size: 1.04rem; margin-bottom: .4em; }
.feature p { font-size: .92rem; color: var(--text-soft); }

.section--dark .feature {
  background: rgba(255,255,255,.045);
  border-color: rgba(255,255,255,.1);
}
.section--dark .feature:hover { border-color: rgba(255,255,255,.24); }
.section--dark .feature__icon { background: rgba(94,201,193,.14); color: #5ec9c1; }
.section--dark .feature p { color: var(--text-invert-soft); }

/* ---------- 10. 数据条 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat {
  background: #fff;
  padding: 32px 24px;
  text-align: center;
}
.stat strong {
  display: block;
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -.03em;
  color: var(--ink);
  line-height: 1.1;
  margin-bottom: 6px;
}
.stat strong em { font-style: normal; color: var(--accent); }
.stat span { font-size: .88rem; color: var(--text-soft); }

.section--dark .stats { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.1); }
.section--dark .stat { background: transparent; }
.section--dark .stat strong { color: #fff; }
.section--dark .stat span { color: var(--text-invert-soft); }

/* ---------- 11. 流程步骤 ---------- */
.steps { display: grid; gap: 0; counter-reset: step; }
.step {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.step:first-child { border-top: 1px solid var(--line); }
.step__num {
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--accent);
  padding-top: 5px;
}
.step h3 { font-size: 1.08rem; margin-bottom: .3em; }
.step p { font-size: .94rem; color: var(--text-soft); margin-bottom: 0; }

/* ---------- 12. 分栏内容 ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.split--reverse .split__media { order: 2; }
.split__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, #eef1f4 0%, #dde3e8 100%);
  aspect-ratio: 5 / 4;
}
.split__media img { width: 100%; height: 100%; object-fit: cover; }
.split__body h2 { margin-bottom: .5em; }
.split__body > p { color: var(--text-soft); }

/* 勾选列表 */
.checklist { list-style: none; padding: 0; margin: 22px 0 0; }
.checklist li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 12px;
  font-size: .95rem;
  color: var(--text-soft);
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .52em;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-tint);
}
.checklist li::after {
  content: "";
  position: absolute;
  left: 5.5px;
  top: .78em;
  width: 4px;
  height: 8px;
  border: solid var(--accent);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.section--dark .checklist li { color: var(--text-invert-soft); }
.section--dark .checklist li::before { background: rgba(94,201,193,.16); }

/* ---------- 13. 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: .93rem; background: #fff; }
thead th {
  text-align: left;
  padding: 14px 18px;
  background: var(--bg-alt);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--ink-mute);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
tbody td { padding: 14px 18px; border-bottom: 1px solid var(--line); color: var(--text-soft); }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: #fafbfc; }
tbody td strong { color: var(--ink); }

/* ---------- 14. 询盘表单 ---------- */
.form-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow);
}
.form-row { display: grid; gap: 18px; grid-template-columns: 1fr 1fr; margin-bottom: 18px; }
.field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 18px; }
.form-row .field { margin-bottom: 0; }
.field label {
  font-size: .86rem;
  font-weight: 650;
  color: var(--ink);
}
.field label .req { color: #c0392b; }
.field input,
.field select,
.field textarea {
  font: inherit;
  font-size: .95rem;
  padding: 12px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
  transition: border-color var(--t), box-shadow var(--t);
  width: 100%;
}
.field textarea { resize: vertical; min-height: 130px; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15,123,116,.12);
}
.field .hint { font-size: .8rem; color: var(--ink-mute); }

.form-note {
  font-size: .84rem;
  color: var(--ink-mute);
  margin-top: 16px;
}

/* 表单提交后的提示 */
.form-status {
  display: none;
  padding: 14px 18px;
  border-radius: var(--radius);
  font-size: .92rem;
  margin-bottom: 20px;
}
.form-status.is-visible { display: block; }
.form-status--ok { background: var(--accent-tint); color: var(--accent-dark); border: 1px solid #bfe0dc; }

/* 联系信息块 */
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 18px;
  align-items: start;
}
.contact-list li:first-child { border-top: 1px solid var(--line); }
.contact-list dt {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--ink-mute);
  padding-top: 3px;
}
.contact-list dd { margin: 0; font-size: .95rem; color: var(--text); }

/* ---------- 15. CTA 区块 ---------- */
.cta {
  background: var(--bg-dark);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  display: grid;
  grid-template-columns: 1.2fr auto;
  gap: 40px;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.cta::before {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(94,201,193,.16) 0%, transparent 70%);
}
.cta h2 { color: #fff; margin-bottom: .35em; }
.cta p { color: var(--text-invert-soft); margin-bottom: 0; max-width: 52ch; }
.cta__actions { display: flex; flex-wrap: wrap; gap: 12px; position: relative; }

/* ---------- 16. 页脚 ---------- */
.site-footer {
  background: var(--bg-dark);
  color: var(--text-invert-soft);
  padding: 64px 0 30px;
  font-size: .92rem;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 44px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 800;
  font-size: 1.04rem;
  color: #fff;
  margin-bottom: 14px;
}
.footer__brand .brand__mark { background: #fff; color: var(--ink); }
.site-footer p { color: var(--text-invert-soft); }
.site-footer h4 {
  color: #fff;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.footer__links { list-style: none; padding: 0; margin: 0; }
.footer__links li { margin-bottom: 10px; }
.footer__links a { color: var(--text-invert-soft); font-size: .92rem; }
.footer__links a:hover { color: #fff; }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  padding-top: 26px;
  font-size: .85rem;
}
.footer__bottom p { margin: 0; color: #7c8899; }

/* ---------- 17. 内页头部 ---------- */
.page-head {
  padding: 58px 0 46px;
  background:
    radial-gradient(900px 380px at 82% -30%, var(--accent-tint) 0%, transparent 60%),
    var(--bg-alt);
  border-bottom: 1px solid var(--line);
}
.page-head h1 { margin-bottom: .35em; }
.page-head p { color: var(--text-soft); font-size: 1.06rem; max-width: 62ch; margin-bottom: 0; }

.breadcrumb {
  font-size: .84rem;
  color: var(--ink-mute);
  margin-bottom: 14px;
}
.breadcrumb a { color: var(--ink-mute); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 7px; opacity: .5; }

/* ---------- 18. 提示框 ---------- */
.notice {
  padding: 18px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-alt);
  font-size: .93rem;
  color: var(--text-soft);
}
.notice--accent {
  background: var(--accent-tint);
  border-color: #bfe0dc;
  color: var(--accent-dark);
}
.notice strong { color: var(--ink); }
.notice--accent strong { color: var(--accent-dark); }

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1040px) {
  .hero__grid { grid-template-columns: 1fr; gap: 48px; }
  .hero__visual { max-width: 480px; aspect-ratio: 16 / 11; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .split--reverse .split__media { order: 0; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .cta { grid-template-columns: 1fr; padding: 44px 32px; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .section { padding: 62px 0; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nav__links { display: none; }
  .nav__toggle { display: grid; }

  /* 移动端展开菜单 */
  .nav.is-open .nav__links {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 24px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }
  .nav.is-open .nav__links a { padding: 13px 14px; font-size: 1rem; }
  .site-header { position: relative; }
  .nav { position: relative; }
}

@media (max-width: 640px) {
  .wrap { padding-inline: 18px; }
  .section { padding: 52px 0; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .grid { gap: 20px; }
  .hero { padding: 60px 0 56px; }
  .hero__stats { gap: 26px; }
  .hero__cta .btn { width: 100%; }
  .form-row { grid-template-columns: 1fr; }
  .form-card { padding: 24px 20px; }
  .footer__grid { grid-template-columns: 1fr; }
  .step { grid-template-columns: 1fr; gap: 8px; }
  .contact-list li { grid-template-columns: 1fr; gap: 6px; }
  .cta { padding: 36px 24px; }
  .page-head { padding: 40px 0 34px; }
}

/* ---------- 20. 打印 & 动效偏好 ---------- */
@media print {
  .site-header, .site-footer, .cta, .hero__visual { display: none; }
  body { font-size: 12pt; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}