/* ============================================================
   天箭星科技 TIANJIANXING 站点样式
   双色体系：绿色科技 = WorkBuddy 绿 | 数智科技 = 腾讯蓝
   ============================================================ */
:root {
  /* 品牌深色 */
  --ink: #0A1633;          /* 深蓝黑，用于深色背景 */
  --ink-2: #0F1F47;
  /* WorkBuddy 绿 */
  --wb-green: #D8F238;     /* 标志酸性绿（点缀） */
  --wb-green-deep: #355E18;/* 深绿（文字/主题） */
  --green: #2E8B3D;       /* 主题主绿，用于绿色科技模块 */
  --green-soft: #EAF7EC;
  --green-line: #C9E6CF;
  /* 腾讯蓝 */
  --blue: #0052D9;        /* 腾讯蓝 */
  --blue-2: #2E7BE5;
  --blue-soft: #EAF1FE;
  --blue-line: #C5D9FB;
  /* 中性 */
  --text: #1A2233;
  --text-2: #4A5568;
  --text-3: #76809A;
  --bg: #FFFFFF;
  --bg-soft: #F6F8FB;
  --bg-mute: #EEF2F7;
  --border: #E3E8F0;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(15, 31, 71, .08);
  --shadow-lg: 0 18px 48px rgba(15, 31, 71, .14);
  --maxw: 1180px;
  --nav-h: 68px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans CN", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* ============================================================
   文章与列表页面样式
   ============================================================ */

/* Header（简化版导航） */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.95); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header .nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
  height: var(--nav-h);
}
.header .logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; color: var(--ink); font-size: 19px;
}
.header .logo-icon {
  width: 26px; height: 26px; border-radius: 7px;
  background: linear-gradient(135deg, var(--wb-green), var(--green));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 14px;
}
.header .nav-links { display: flex; align-items: center; gap: 24px; }
.header .nav-links a {
  font-size: 15px; font-weight: 600; color: var(--text-2);
  transition: color .2s;
}
.header .nav-links a:hover { color: var(--green); }
.header .nav-links a.active { color: var(--green); }

/* 下拉菜单 */
.dropdown { position: relative; }
.dropdown-btn {
  background: none; border: none; cursor: pointer;
  font-size: 15px; font-weight: 600; color: var(--text-2);
  display: flex; align-items: center; gap: 4px;
  padding: 6px 0;
}
.dropdown-btn:hover { color: var(--green); }
.dropdown-btn .arrow { font-size: 10px; transition: transform .2s; }
.dropdown:hover .dropdown-btn .arrow { transform: rotate(180deg); }
.dropdown-content {
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
  background: #fff; border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg); min-width: 180px;
  opacity: 0; visibility: hidden; transition: all .2s;
  padding: 8px 0; margin-top: 8px;
}
.dropdown:hover .dropdown-content { opacity: 1; visibility: visible; }
.dropdown-item {
  display: block; padding: 10px 20px; font-size: 14px;
  color: var(--text-2); transition: all .2s;
}
.dropdown-item:hover { background: var(--bg-soft); color: var(--green); }

/* Article Page */
.article-page {
  min-height: 60vh; padding: 60px 0 80px;
}
.article {
  max-width: 800px; margin: 0 auto;
}
.article-header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.article-meta {
  display: flex; align-items: center; gap: 16px;
  font-size: 14px; color: var(--text-3);
  margin-bottom: 20px;
}
.category-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--blue-soft);
  color: var(--blue);
  border-radius: 12px;
  font-size: 13px;
  font-weight: 600;
}
.article-title {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.3;
  margin-bottom: 20px;
  color: var(--ink);
}
.article-summary {
  font-size: 18px;
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: 20px;
}
.tags {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.tag {
  padding: 4px 12px;
  background: var(--bg-soft);
  color: var(--text-2);
  border-radius: 16px;
  font-size: 13px;
}
.article-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
}
.article-content h2 {
  font-size: 28px;
  margin: 48px 0 20px;
  color: var(--ink);
}
.article-content h3 {
  font-size: 22px;
  margin: 36px 0 16px;
  color: var(--ink);
}
.article-content p {
  margin-bottom: 20px;
  color: var(--text);
}
.article-content ul, .article-content ol {
  margin: 20px 0;
  padding-left: 28px;
}
.article-content li {
  margin-bottom: 10px;
  list-style: disc;
}
.article-content blockquote {
  margin: 32px 0;
  padding: 20px 24px;
  background: var(--bg-soft);
  border-left: 4px solid var(--green);
  border-radius: var(--radius-sm);
  font-style: italic;
  color: var(--text-2);
}
.article-content code {
  background: var(--bg-soft);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 14px;
}
.article-content pre {
  background: var(--ink);
  color: #fff;
  padding: 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 24px 0;
}
.article-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}
.article-footer {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.article-nav {
  display: flex; justify-content: space-between; gap: 16px;
}

/* Listing Page */
.listing-page {
  min-height: 60vh;
}
.listing-header {
  background: linear-gradient(135deg, var(--green-soft), #fff);
  padding: 60px 0 48px;
  border-bottom: 1px solid var(--border);
}
.listing-title {
  font-size: clamp(32px, 5vw, 48px);
  margin-bottom: 16px;
  color: var(--ink);
}
.listing-desc {
  font-size: 18px;
  color: var(--text-2);
}
.listing-content {
  max-width: var(--maxw);
  padding: 60px 20px;
}
.article-list {
  display: grid;
  gap: 32px;
}
.article-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all .2s;
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
  font-size: 14px;
  color: var(--text-3);
}
.card-tags {
  display: flex; gap: 8px;
}
.tag-sm {
  padding: 2px 8px;
  background: var(--bg-soft);
  color: var(--text-2);
  border-radius: 10px;
  font-size: 12px;
}
.card-title {
  font-size: 24px;
  margin-bottom: 12px;
  line-height: 1.4;
}
.card-title a {
  color: var(--ink);
  transition: color .2s;
}
.card-title a:hover {
  color: var(--green);
}
.card-summary {
  font-size: 16px;
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: 20px;
}
.card-footer {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.read-more {
  color: var(--green);
  font-weight: 600;
  transition: color .2s;
}
.read-more:hover {
  color: var(--wb-green-deep);
}
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-3);
}
.empty-state p {
  font-size: 18px;
  margin-bottom: 8px;
}

/* Footer（简化版） */
.footer {
  background: var(--ink);
  color: #C7D0E6;
  padding: 48px 0 24px;
  margin-top: 80px;
}
.footer-content {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}
.footer-section h4 {
  color: #fff;
  font-size: 18px;
  margin-bottom: 16px;
}
.footer-section h5 {
  color: #fff;
  font-size: 14px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.footer-section p {
  font-size: 14px;
  margin-bottom: 8px;
  color: #9FB0D0;
}
.footer-section .email {
  color: var(--wb-green);
  font-weight: 600;
}
.footer-section a {
  display: block;
  color: #9FB0D0;
  font-size: 14px;
  padding: 6px 0;
  transition: color .2s;
}
.footer-section a:hover {
  color: var(--wb-green);
}
.footer-bottom {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 20px 0;
  border-top: 1px solid rgba(255,255,255,.1);
  text-align: center;
  font-size: 13px;
  color: #8FA0C4;
}

/* Responsive for article/listing pages */
@media (max-width: 720px) {
  .header .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0;
    padding: 0; max-height: 0; overflow: hidden;
    transition: all .3s;
    border-bottom: 1px solid var(--border);
  }
  .header .nav-links.open {
    max-height: 400px; padding: 20px;
  }
  .dropdown-content {
    position: static; transform: none;
    box-shadow: none; margin-top: 0;
    padding: 0 0 0 20px;
  }
  .article { padding: 0 20px; }
  .article-meta { flex-wrap: wrap; }
  .article-nav { flex-direction: column; }
  .listing-header { padding: 40px 0 32px; }
  .article-card { padding: 24px; }
  .footer-content { grid-template-columns: 1fr 1fr; }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; color: var(--ink); font-weight: 800; letter-spacing: -.01em; }
h1 { font-size: clamp(28px, 4.4vw, 46px); }
h2 { font-size: clamp(24px, 3.2vw, 36px); }
h3 { font-size: clamp(18px, 2vw, 22px); }
p { margin: 0 0 1em; color: var(--text-2); }
ul { margin: 0; padding: 0; list-style: none; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.section { padding: 84px 0; }
.section--soft { background: var(--bg-soft); }
.section--dark { background: var(--ink); color: #fff; }
.section--dark h1, .section--dark h2, .section--dark h3 { color: #fff; }
.section--dark p { color: #C7D0E6; }

/* 标签 */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: var(--text-3); margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: currentColor; opacity: .5; }
.section--dark .eyebrow { color: var(--wb-green); }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-weight: 700; font-size: 15px;
  border: 1.5px solid transparent; cursor: pointer; transition: .2s; white-space: nowrap;
}
.btn--green { background: var(--green); color: #fff; }
.btn--green:hover { background: var(--wb-green-deep); }
.btn--blue { background: var(--blue); color: #fff; }
.btn--blue:hover { background: var(--blue-2); }
.btn--ghost { border-color: rgba(255,255,255,.4); color: #fff; }
.btn--ghost:hover { background: rgba(255,255,255,.1); }
.btn--outline { border-color: var(--green); color: var(--green); }
.btn--outline:hover { background: var(--green-soft); }
.btn--outline-blue { border-color: var(--blue); color: var(--blue); }
.btn--outline-blue:hover { background: var(--blue-soft); }
.btn .arrow { font-size: 1.1em; }

/* 导航 */
.site-header {
  position: sticky; top: 0; z-index: 50; height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(255,255,255,.86); backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); font-size: 19px; letter-spacing: .02em; }
.brand .mark { width: 26px; height: 26px; border-radius: 7px; background: linear-gradient(135deg, var(--wb-green), var(--green)); position: relative; flex: none; }
.brand .mark::after { content: ""; position: absolute; inset: 0; background:
  linear-gradient(135deg, transparent 44%, #fff 44%, #fff 56%, transparent 56%); transform: rotate(45deg); opacity: .8; }
.brand small { font-weight: 600; color: var(--text-3); font-size: 11px; letter-spacing: .14em; display: block; margin-top: -4px; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { font-size: 15px; font-weight: 600; color: var(--text-2); transition: .15s; position: relative; padding: 6px 0; }
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-links a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--green); }
.nav-cta { margin-left: 8px; }

/* 下拉菜单 */
.nav-dropdown { position: relative; }
.nav-dropdown > a { display: flex; align-items: center; gap: 4px; cursor: pointer; }
.dropdown-arrow { font-size: 10px; transition: transform .2s; }
.nav-dropdown:hover .dropdown-arrow { transform: rotate(180deg); }
.dropdown-menu {
  position: absolute; top: 100%; left: 0; min-width: 160px;
  background: #fff; border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg); padding: 8px 0; margin-top: 12px;
  opacity: 0; visibility: hidden; transition: all .2s;
}
.nav-dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; }
.dropdown-menu a {
  display: block; padding: 10px 18px; font-size: 14px;
  color: var(--text-2); transition: all .15s; border-radius: 0;
  width: auto; border-bottom: none;
}
.dropdown-menu a:hover { background: var(--bg-soft); color: var(--ink); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 42px; height: 42px; flex-direction: column; gap: 5px; justify-content: center; align-items: center; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: .2s; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 90px 0 76px; background:
    radial-gradient(1200px 600px at 80% -10%, rgba(216,242,56,.18), transparent 60%),
    radial-gradient(1000px 600px at 0% 10%, rgba(0,82,217,.12), transparent 55%),
    linear-gradient(180deg, #fbfdff, #fff); }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 50px; align-items: center; }
.hero h1 { margin-bottom: 18px; }
.hero .lead { font-size: 18px; color: var(--text-2); max-width: 36em; }
.hero .mission { font-size: clamp(20px, 2.4vw, 28px); font-weight: 800; color: var(--ink); line-height: 1.4; }
.hero .mission b { color: var(--green); }
.hero .mission .b { color: var(--blue); }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 26px; }
.hero-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.hero-card .dual { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.dual-link { display: block; padding: 18px; border-radius: var(--radius-sm); border: 1px solid var(--border); transition: .2s; }
.dual-link:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.dual-link.green { background: var(--green-soft); border-color: var(--green-line); }
.dual-link.blue { background: var(--blue-soft); border-color: var(--blue-line); }
.dual-link .t { font-weight: 800; font-size: 17px; color: var(--ink); }
.dual-link.green .t { color: var(--green); }
.dual-link.blue .t { color: var(--blue); }
.dual-link .d { font-size: 13px; color: var(--text-2); margin: 4px 0 0; }
.dual-link .p { font-size: 12px; color: var(--text-3); margin-top: 10px; font-weight: 600; }

/* 星点背景装饰 */
.stars { position: absolute; inset: 0; pointer-events: none; opacity: .5; }
.stars span { position: absolute; width: 3px; height: 3px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--wb-green); }
.stars span.b { background: var(--blue); box-shadow: 0 0 8px var(--blue-2); }

/* 区块标题 */
.sec-head { max-width: 720px; margin: 0 auto 46px; text-align: center; }
.sec-head p { font-size: 17px; }

/* 卡片网格 */
.grid { display: grid; gap: 22px; }
.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(--border); border-radius: var(--radius); padding: 28px; transition: .2s; }
.card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.card .ico { width: 46px; height: 46px; border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; font-size: 22px; }
.card.green .ico { background: var(--green-soft); color: var(--green); }
.card.blue .ico { background: var(--blue-soft); color: var(--blue); }
.card.neutral .ico { background: var(--bg-mute); color: var(--ink); }
.card h3 { margin-bottom: 8px; }
.card .tag { font-size: 12px; font-weight: 700; color: var(--text-3); letter-spacing: .04em; }

/* 主题块 */
.module-band { border-radius: var(--radius); padding: 40px; display: grid; grid-template-columns: auto 1fr; gap: 26px; align-items: center; }
.module-band.green { background: linear-gradient(135deg, var(--green-soft), #fff); border: 1px solid var(--green-line); }
.module-band.blue { background: linear-gradient(135deg, var(--blue-soft), #fff); border: 1px solid var(--blue-line); }
.module-band .badge { width: 84px; height: 84px; border-radius: 20px; display: flex; align-items: center; justify-content: center; font-size: 38px; color: #fff; }
.module-band.green .badge { background: linear-gradient(135deg, var(--wb-green), var(--green)); }
.module-band.blue .badge { background: linear-gradient(135deg, var(--blue-2), var(--blue)); }
.module-band h3 { margin: 0 0 6px; }
.module-band p { margin: 0; }

/* 数据点（实力速览） */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat { text-align: center; padding: 26px 16px; border-radius: var(--radius); background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12); }
.section--soft .stat { background: #fff; border-color: var(--border); }
.stat .num { font-size: clamp(28px, 3.4vw, 40px); font-weight: 900; color: var(--green); line-height: 1; }
.stat.blue .num { color: var(--blue); }
.stat .lbl { font-size: 14px; color: var(--text-2); margin-top: 10px; }
.section--dark .stat .lbl { color: #C7D0E6; }

/* 路径步骤 */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: step; }
.step { position: relative; padding: 26px 22px; border-radius: var(--radius); background: var(--blue-soft); border: 1px solid var(--blue-line); }
.step .n { width: 38px; height: 38px; border-radius: 50%; background: var(--blue); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800; margin-bottom: 14px; }
.step h4 { font-size: 18px; margin: 0 0 4px; color: var(--ink); }
.step p { font-size: 14px; margin: 0; }
.steps-note { margin-top: 22px; text-align: center; font-weight: 700; color: var(--ink); }
.steps-note b { color: var(--blue); }

/* 服务体系表 */
.svc-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
.svc-table th, .svc-table td { text-align: left; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.svc-table th { background: var(--blue-soft); color: var(--ink); font-size: 14px; }
.svc-table td:first-child { font-weight: 800; color: var(--ink); }
.svc-table tr:last-child td { border-bottom: 0; }
.svc-table .period { color: var(--blue); font-weight: 700; white-space: nowrap; }

/* 资质 */
.badges { display: flex; flex-wrap: wrap; gap: 12px; }
.badge-pill { padding: 10px 18px; border-radius: 999px; background: var(--bg-soft); border: 1px solid var(--border); font-size: 14px; font-weight: 600; color: var(--text-2); }
.badge-pill.green { background: var(--green-soft); border-color: var(--green-line); color: var(--wb-green-deep); }
.badge-pill.blue { background: var(--blue-soft); border-color: var(--blue-line); color: var(--blue); }

/* 四大绿色科技详情 */
.tech { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.tech .card { border-left: 4px solid var(--green); }
.tech .metric { font-size: 26px; font-weight: 900; color: var(--green); }

/* 生态协作 */
.eco { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.eco .col { padding: 22px; border-radius: var(--radius-sm); background: var(--bg-soft); border: 1px solid var(--border); }
.eco .col h4 { color: var(--green); font-size: 16px; margin: 0 0 8px; }
.eco .col p { font-size: 13.5px; margin: 0; }

/* 为什么选我们 */
.why { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.why .item { display: flex; gap: 14px; padding: 20px; border-radius: var(--radius-sm); background: #fff; border: 1px solid var(--border); }
.why .num { flex: none; width: 34px; height: 34px; border-radius: 9px; background: var(--blue); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800; }
.why h4 { margin: 0 0 4px; font-size: 16px; }
.why p { margin: 0; font-size: 14px; }

/* 联系页 */
.contact-split { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.contact-card { padding: 30px; border-radius: var(--radius); }
.contact-card.green { background: var(--green-soft); border: 1px solid var(--green-line); }
.contact-card.blue { background: var(--blue-soft); border: 1px solid var(--blue-line); }
.contact-card h3 { margin: 0 0 6px; }
.contact-card.green h3 { color: var(--green); }
.contact-card.blue h3 { color: var(--blue); }
.mail-box { display: inline-flex; align-items: center; gap: 10px; margin-top: 14px; padding: 14px 22px; background: #fff; border: 1px dashed var(--border); border-radius: 999px; font-weight: 700; color: var(--ink); }

/* 联系页为纯邮箱入口，无表单 */

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 12px; background: #fff; overflow: hidden; }
.faq-q { width: 100%; text-align: left; background: none; border: 0; cursor: pointer; padding: 18px 22px; font-size: 16px; font-weight: 700; color: var(--ink); display: flex; justify-content: space-between; align-items: center; gap: 14px; }
.faq-q .plus { flex: none; width: 22px; height: 22px; position: relative; }
.faq-q .plus::before, .faq-q .plus::after { content: ""; position: absolute; background: var(--green); border-radius: 2px; }
.faq-q .plus::before { left: 50%; top: 4px; bottom: 4px; width: 2px; transform: translateX(-50%); }
.faq-q .plus::after { top: 50%; left: 4px; right: 4px; height: 2px; transform: translateY(-50%); }
.faq-item.open .plus::before { opacity: 0; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a p { padding: 0 22px 18px; margin: 0; }

/* 页脚 */
.site-footer { background: var(--ink); color: #C7D0E6; padding: 56px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.site-footer .brand { color: #fff; margin-bottom: 14px; }
.site-footer p { color: #9FB0D0; font-size: 14px; }
.footer-col h5 { color: #fff; font-size: 14px; letter-spacing: .04em; margin: 0 0 14px; }
.footer-col a { display: block; color: #9FB0D0; font-size: 14px; padding: 5px 0; transition: .15s; }
.footer-col a:hover { color: var(--wb-green); }
.footer-mail { color: var(--wb-green); font-weight: 700; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 40px; padding-top: 22px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; color: #8FA0C4; }

/* 面包屑 */
.crumb { font-size: 13px; color: var(--text-3); padding: 16px 0 0; }
.crumb a:hover { color: var(--ink); }

/* CTA 条 */
.cta-band { background: linear-gradient(135deg, var(--ink), var(--ink-2)); border-radius: var(--radius); padding: 46px; text-align: center; color: #fff; }
.cta-band h2 { color: #fff; margin-bottom: 10px; }
.cta-band p { color: #C7D0E6; margin-bottom: 22px; }

/* 揭示动画 */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* 响应式 */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .eco { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links { position: fixed; top: var(--nav-h); left: 0; right: 0; background: #fff; flex-direction: column; gap: 0; padding: 10px 22px 20px; border-bottom: 1px solid var(--border); transform: translateY(-130%); transition: .25s; box-shadow: var(--shadow); }
  .nav-links.open { transform: none; }
  .nav-links a { width: 100%; padding: 14px 0; border-bottom: 1px solid var(--border); }
  .nav-links a.active::after { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .grid-2, .grid-3, .grid-4, .tech, .why, .contact-split { grid-template-columns: 1fr; }
  .hero-card .dual { grid-template-columns: 1fr; }
  .module-band { grid-template-columns: 1fr; text-align: center; }
  .section { padding: 60px 0; }
  .stats { grid-template-columns: 1fr 1fr; }
}