/* 陈杨龙 · 海外工业项目导入顾问
   视觉：深海军蓝 + 石墨灰 + 工业橙，克制、专业、编辑感
*/

:root {
  --ink: #0d1524;
  --ink-2: #16213a;
  --navy: #1a2b47;
  --steel: #4a5a72;
  --slate: #6b7a90;
  --line: #e3e7ee;
  --line-strong: #cfd6e0;
  --paper: #ffffff;
  --paper-2: #f7f8fa;
  --paper-3: #eef1f5;
  --orange: #c2601f;
  --orange-soft: #fdf2e9;
  --teal: #2f6b62;
  --teal-soft: #eaf2f0;
  --ok: #2f7a4d;
  --err: #b4362f;

  --radius: 10px;
  --radius-lg: 14px;
  --maxw: 1140px;

  --shadow-sm: 0 1px 2px rgba(13, 21, 36, 0.05);
  --shadow: 0 4px 16px rgba(13, 21, 36, 0.07);
  --shadow-lg: 0 12px 40px rgba(13, 21, 36, 0.1);

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans CN",
    sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ---------------------------------------------------------------- 布局 */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.wrap-narrow {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 72px 0; }
section.tight { padding: 48px 0; }
.bg-2 { background: var(--paper-2); }
.bg-3 { background: var(--paper-3); }
.bg-ink { background: var(--ink); color: #fff; }

/* ---------------------------------------------------------------- 导航 */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: 66px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 15.5px;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0;
  font-family: var(--mono);
}

.brand-sub {
  display: block;
  font-size: 10.5px;
  font-weight: 500;
  color: var(--slate);
  letter-spacing: 0.02em;
  line-height: 1.2;
  margin-top: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
}

.nav-links a {
  padding: 7px 12px;
  border-radius: 7px;
  font-size: 13.5px;
  color: var(--steel);
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.nav-links a:hover { background: var(--paper-3); color: var(--ink); }
.nav-links a.on { color: var(--ink); font-weight: 600; }

.nav-cta { margin-left: auto; }

/* 移动端菜单 */
.nav-toggle {
  display: none;
  margin-left: auto;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  place-items: center;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--ink);
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: var(--ink);
}

.nav-toggle span::before { top: -5px; }
.nav-toggle span::after { top: 5px; }

/* ---------------------------------------------------------------- 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  height: 44px;
  padding: 0 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.16s;
  font-family: inherit;
  white-space: nowrap;
}

.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--ink-2); transform: translateY(-1px); box-shadow: var(--shadow); }

.btn-accent { background: var(--orange); color: #fff; }
.btn-accent:hover { background: #a94f14; transform: translateY(-1px); box-shadow: var(--shadow); }

.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--steel); background: var(--paper-2); }

.btn-sm { height: 36px; padding: 0 14px; font-size: 13px; border-radius: 7px; }
.btn-block { width: 100%; }

/* ---------------------------------------------------------------- 文字 */
h1, h2, h3, h4 {
  margin: 0;
  letter-spacing: -0.022em;
  line-height: 1.28;
  font-weight: 700;
}

h1 { font-size: clamp(30px, 4.4vw, 47px); }
h2 { font-size: clamp(23px, 2.9vw, 32px); }
h3 { font-size: 18.5px; }
h4 { font-size: 15.5px; }

p { margin: 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 16px;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1.5px;
  background: var(--orange);
}

.lead {
  font-size: 17px;
  line-height: 1.85;
  color: var(--steel);
}

.muted { color: var(--slate); }
.small { font-size: 13px; line-height: 1.7; }
.tiny { font-size: 11.5px; line-height: 1.65; }

.section-head { max-width: 660px; margin-bottom: 40px; }
.section-head p { margin-top: 14px; }

/* ---------------------------------------------------------------- Hero */
.hero {
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1000px 400px at 85% -10%, rgba(194, 96, 31, 0.06), transparent 70%),
    linear-gradient(180deg, #fff 0%, var(--paper-2) 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.35;
  mask-image: radial-gradient(circle at 70% 20%, black, transparent 72%);
  -webkit-mask-image: radial-gradient(circle at 70% 20%, black, transparent 72%);
  pointer-events: none;
}

.hero .wrap { position: relative; }

.hero h1 { max-width: 830px; }
.hero .lead { margin-top: 22px; max-width: 640px; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.hero-note {
  margin-top: 18px;
  font-size: 12.5px;
  color: var(--slate);
}

/* 能力四项 */
.caps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 52px;
}

.cap {
  background: #fff;
  padding: 20px 18px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.cap-num {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--orange);
  font-weight: 600;
  padding-top: 3px;
  flex-shrink: 0;
}

.cap-text {
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: -0.01em;
}

/* ---------------------------------------------------------------- 卡片 */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 26px;
  transition: border-color 0.18s, box-shadow 0.18s, transform 0.18s;
}

.card.hover:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.card h3 { margin-bottom: 10px; }
.card p { font-size: 14px; color: var(--steel); line-height: 1.75; }

.card-tag {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--orange);
  background: var(--orange-soft);
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 14px;
}

.card-tag.teal { color: var(--teal); background: var(--teal-soft); }
.card-tag.grey { color: var(--steel); background: var(--paper-3); }

/* 问题卡片 */
.problem {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-strong);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 22px 24px;
  transition: border-left-color 0.18s, box-shadow 0.18s;
}

.problem:hover { border-left-color: var(--orange); box-shadow: var(--shadow-sm); }
.problem h4 { margin-bottom: 8px; }
.problem p { font-size: 13.5px; color: var(--steel); line-height: 1.7; }

/* ---------------------------------------------------------------- 服务 */
.svc {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.18s, box-shadow 0.18s;
}

.svc:hover { border-color: var(--line-strong); box-shadow: var(--shadow); }

.svc-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.svc h3 { font-size: 19px; }

.svc-price {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--orange);
  white-space: nowrap;
}

.svc-fit {
  font-size: 12.5px;
  color: var(--slate);
  margin-bottom: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.svc-list { list-style: none; margin: 0 0 18px; padding: 0; }
.svc-list li {
  font-size: 13.5px;
  color: var(--steel);
  padding-left: 18px;
  position: relative;
  margin-bottom: 7px;
  line-height: 1.65;
}

.svc-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--orange);
}

.svc-bound {
  font-size: 12px;
  color: var(--slate);
  background: var(--paper-2);
  border-radius: 7px;
  padding: 11px 13px;
  line-height: 1.6;
  margin-bottom: 20px;
}

.svc-bound b { color: var(--steel); font-weight: 600; }

.svc .btn { margin-top: auto; }

/* ---------------------------------------------------------------- 流程 */
.steps { display: grid; gap: 0; counter-reset: step; }

.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.step:last-child { border-bottom: 0; }

.step-num {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--orange);
  padding-top: 3px;
  letter-spacing: 0.04em;
}

.step h4 { margin-bottom: 7px; }
.step p { font-size: 13.5px; color: var(--steel); line-height: 1.7; max-width: 720px; }

/* ---------------------------------------------------------------- 案例 */
.case-card {
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.18s, box-shadow 0.18s, transform 0.18s;
}

.case-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.case-body { padding: 26px; }

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 11.5px;
  color: var(--slate);
  margin-bottom: 14px;
  font-family: var(--mono);
  letter-spacing: 0.01em;
}

.case-meta span { display: inline-flex; align-items: center; gap: 5px; }

.case-body h3 { margin-bottom: 10px; font-size: 18px; }
.case-body p { font-size: 13.5px; color: var(--steel); line-height: 1.72; }

.case-foot {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--slate);
}

.case-foot .arrow { color: var(--orange); font-weight: 600; }

/* ---------------------------------------------------------------- 文章 */
.post-row {
  display: grid;
  grid-template-columns: 96px 1fr auto;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  transition: background 0.15s;
}

.post-row:hover { background: var(--paper-2); }
.post-row:last-child { border-bottom: 0; }

.post-date {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--slate);
  padding-top: 3px;
  letter-spacing: 0.02em;
}

.post-row h3 { font-size: 17px; margin-bottom: 7px; }
.post-row p { font-size: 13.5px; color: var(--steel); line-height: 1.7; }

.post-cat {
  font-size: 11px;
  font-weight: 600;
  color: var(--steel);
  background: var(--paper-3);
  padding: 4px 9px;
  border-radius: 5px;
  white-space: nowrap;
  align-self: start;
}

/* ---------------------------------------------------------------- 表单 */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.field { display: flex; flex-direction: column; gap: 7px; }
.field.full { grid-column: 1 / -1; }

.field label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--steel);
  letter-spacing: 0.01em;
}

.field label .req { color: var(--orange); }

.field input,
.field select,
.field textarea {
  width: 100%;
  height: 44px;
  padding: 0 13px;
  font-size: 14px;
  font-family: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  transition: border-color 0.15s, box-shadow 0.15s;
  appearance: none;
}

.field textarea {
  height: auto;
  min-height: 110px;
  padding: 11px 13px;
  resize: vertical;
  line-height: 1.7;
}

.field select {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath fill='%236b7a90' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 13px center;
  padding-right: 36px;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(13, 21, 36, 0.07);
}

.field input.err,
.field select.err,
.field textarea.err { border-color: var(--err); }

.field .hint { font-size: 11.5px; color: var(--slate); line-height: 1.55; }
.field .err-msg { font-size: 11.5px; color: var(--err); display: none; }
.field .err-msg.show { display: block; }

.checkline {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 12.5px;
  color: var(--steel);
  line-height: 1.65;
  cursor: pointer;
}

.checkline input {
  width: 16px;
  height: 16px;
  margin: 3px 0 0;
  flex-shrink: 0;
  accent-color: var(--ink);
}

.form-note {
  font-size: 11.5px;
  color: var(--slate);
  background: var(--paper-2);
  border-left: 2px solid var(--line-strong);
  padding: 11px 14px;
  border-radius: 0 7px 7px 0;
  line-height: 1.65;
}

.form-msg {
  display: none;
  padding: 13px 16px;
  border-radius: 8px;
  font-size: 13.5px;
  line-height: 1.65;
}

.form-msg.show { display: block; }
.form-msg.ok { background: #edf7f1; color: #1f5c38; border: 1px solid #c4e3d1; }
.form-msg.err { background: #fdf0ef; color: #8f2b25; border: 1px solid #f0cdc9; }

.btn[disabled] { opacity: 0.6; cursor: not-allowed; transform: none !important; }

/* ---------------------------------------------------------------- 提示条 */
.notice {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.7;
  align-items: flex-start;
}

.notice-warn { background: #fffaf2; border: 1px solid #f0dfc4; color: #7a5216; }
.notice-info { background: var(--teal-soft); border: 1px solid #cfe3df; color: #23544c; }
.notice b { font-weight: 700; }

/* ---------------------------------------------------------------- FAQ */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }

.faq summary {
  padding: 20px 0;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  letter-spacing: -0.01em;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 17px;
  color: var(--slate);
  font-weight: 400;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.faq details[open] summary::after { transform: rotate(45deg); }

.faq-body {
  padding: 0 0 22px;
  font-size: 14px;
  color: var(--steel);
  line-height: 1.8;
  max-width: 760px;
}

/* ---------------------------------------------------------------- CTA */
.cta-band {
  background: var(--ink);
  color: #fff;
  padding: 64px 0;
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.cta-band .wrap { position: relative; }
.cta-band h2 { max-width: 620px; }
.cta-band p { color: rgba(255, 255, 255, 0.62); margin-top: 16px; max-width: 560px; font-size: 15px; }
.cta-band .btn-primary { background: #fff; color: var(--ink); }
.cta-band .btn-primary:hover { background: #eef1f5; }
.cta-band .btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.28); }
.cta-band .btn-ghost:hover { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.5); }

/* ---------------------------------------------------------------- 页脚 */
.footer {
  background: var(--paper-2);
  border-top: 1px solid var(--line);
  padding: 52px 0 32px;
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer h4 {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--slate);
  margin-bottom: 14px;
  font-weight: 600;
}

.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: 9px; }
.footer a { color: var(--steel); transition: color 0.15s; }
.footer a:hover { color: var(--ink); }

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
  font-size: 11.5px;
  color: var(--slate);
}

/* ---------------------------------------------------------------- 文章正文 */
.article-head { padding: 56px 0 36px; border-bottom: 1px solid var(--line); }
.article-head h1 { font-size: clamp(26px, 3.4vw, 38px); max-width: 800px; }

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 20px;
  font-size: 12.5px;
  color: var(--slate);
  font-family: var(--mono);
}

.prose { padding: 48px 0 24px; }
.prose h2 { font-size: 22px; margin: 44px 0 16px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 17px; margin: 32px 0 12px; }
.prose p { margin: 0 0 18px; color: #2b3547; line-height: 1.88; }
.prose ul, .prose ol { margin: 0 0 20px; padding-left: 22px; color: #2b3547; }
.prose li { margin-bottom: 9px; line-height: 1.82; }
.prose li::marker { color: var(--orange); }
.prose strong { color: var(--ink); font-weight: 650; }
.prose blockquote {
  margin: 26px 0;
  padding: 4px 0 4px 22px;
  border-left: 2px solid var(--orange);
  color: var(--steel);
  font-size: 16px;
  line-height: 1.8;
}
.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--paper-3);
  padding: 2px 6px;
  border-radius: 4px;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 13.5px;
}

.prose th {
  text-align: left;
  padding: 11px 14px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  font-weight: 600;
  font-size: 12.5px;
  color: var(--steel);
}

.prose td {
  padding: 11px 14px;
  border: 1px solid var(--line);
  color: #2b3547;
  vertical-align: top;
}

/* 文章内服务卡 */
.inline-cta {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 36px 0;
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.inline-cta h4 { margin-bottom: 5px; }
.inline-cta p { font-size: 13px; color: var(--steel); }

/* 上下篇 */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 32px 0 64px;
  border-top: 1px solid var(--line);
}

.post-nav a {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.post-nav a:hover { border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.post-nav .dir { font-size: 11px; color: var(--slate); margin-bottom: 6px; font-family: var(--mono); }
.post-nav .ttl { font-size: 14px; font-weight: 600; line-height: 1.5; }
.post-nav a.next { text-align: right; }

/* ---------------------------------------------------------------- 面包屑 */
.crumb {
  padding: 20px 0;
  font-size: 12.5px;
  color: var(--slate);
  display: flex;
  gap: 8px;
  align-items: center;
}

.crumb a:hover { color: var(--ink); }
.crumb .sep { color: var(--line-strong); }

/* ---------------------------------------------------------------- 时间线 */
.timeline { position: relative; padding-left: 24px; }

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-strong);
}

.tl-item { position: relative; padding-bottom: 32px; }
.tl-item:last-child { padding-bottom: 0; }

.tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--line-strong);
}

.tl-item:first-child::before { border-color: var(--orange); }

.tl-date {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--slate);
  margin-bottom: 5px;
}

.tl-item h4 { font-size: 16px; margin-bottom: 3px; }
.tl-org { font-size: 12.5px; color: var(--orange); font-weight: 600; margin-bottom: 9px; }
.tl-item p { font-size: 13.5px; color: var(--steel); line-height: 1.72; }

/* ---------------------------------------------------------------- 统计 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.stat { background: #fff; padding: 22px; }
.stat b {
  display: block;
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
}
.stat span { font-size: 11.5px; color: var(--slate); display: block; margin-top: 5px; }

/* ---------------------------------------------------------------- 标签 */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  font-size: 12px;
  padding: 5px 11px;
  border-radius: 100px;
  background: var(--paper-3);
  color: var(--steel);
  border: 1px solid transparent;
  transition: all 0.15s;
}

a.chip:hover { border-color: var(--line-strong); color: var(--ink); }
.chip.on { background: var(--ink); color: #fff; }

/* ---------------------------------------------------------------- 响应式 */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .caps { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  section { padding: 56px 0; }
  .post-row { grid-template-columns: 1fr; gap: 8px; }
  .post-cat { justify-self: start; }
}

@media (max-width: 760px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: grid; }
  .nav-inner { gap: 16px; }

  .nav.open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 12px 16px 18px;
    gap: 2px;
    box-shadow: var(--shadow);
  }

  .nav.open .nav-links a { padding: 11px 12px; font-size: 14.5px; }

  .nav.open .nav-cta {
    display: block;
    margin-left: 0;
    padding: 0 12px;
  }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .caps { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .hero { padding: 52px 0 44px; }
  .hero-actions .btn { flex: 1; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .post-nav { grid-template-columns: 1fr; }
  .step { grid-template-columns: 36px 1fr; gap: 14px; }
  .wrap, .wrap-narrow { padding: 0 18px; }
  .svc, .card { padding: 22px; }
  .inline-cta { flex-direction: column; align-items: stretch; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}