/* =========================================================================
   H2Way.cn · 共途网络科技 官方设计系统
   定位：企业级 AI 获客与落地服务商
   风格：纯白专业底色 + 深度墨蓝主色 + 极简科技微渐变
   ========================================================================= */

:root {
  --primary-900: #0a192f;
  --primary-800: #0e2447;
  --primary-700: #143261;
  --primary-600: #1d4ed8;
  --primary-500: #2563eb;
  --primary-100: #dbeafe;
  --primary-50: #eff6ff;

  --accent-cyan: #0284c7;
  --accent-teal: #0d9488;
  --accent-purple: #6366f1;

  --ink-900: #0f172a;
  --ink-800: #1e293b;
  --ink-700: #334155;
  --ink-600: #475569;
  --ink-500: #64748b;
  --ink-400: #94a3b8;
  --ink-200: #e2e8f0;
  --ink-100: #f1f5f9;
  --ink-50: #f8fafc;

  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --bg-white: #ffffff;
  --bg-soft: #f8fafc;
  --bg-muted: #f1f5f9;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 14px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 30px rgba(15, 23, 42, 0.1);
  --shadow-xl: 0 20px 40px rgba(15, 23, 42, 0.14);

  --container: 1220px;
  --font-sans: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, PingFang SC, Hiragino Sans GB, Microsoft YaHei, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  background-color: var(--bg-white);
  color: var(--ink-800);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; transition: color 0.18s ease; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 { color: var(--ink-900); font-weight: 700; line-height: 1.3; margin: 0 0 0.5em; }

.wrap { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); }

/* 图标基础 */
.ico { width: 20px; height: 20px; stroke-width: 2; stroke: currentColor; fill: none; stroke-linecap: round; stroke-linejoin: round; vertical-align: middle; flex-shrink: 0; }

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary-600);
  color: #fff;
  box-shadow: 0 2px 10px rgba(29, 78, 216, 0.28);
}
.btn-primary:hover {
  background: var(--primary-700);
  box-shadow: 0 4px 16px rgba(29, 78, 216, 0.38);
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--primary-50);
  color: var(--primary-600);
  border-color: var(--primary-100);
}
.btn-secondary:hover {
  background: var(--primary-100);
  color: var(--primary-700);
}
.btn-ghost {
  background: #fff;
  color: var(--ink-700);
  border-color: var(--line-strong);
}
.btn-ghost:hover {
  background: var(--ink-50);
  color: var(--ink-900);
  border-color: var(--ink-400);
}
.btn-lg { padding: 14px 30px; font-size: 16.5px; border-radius: var(--radius-lg); }
.btn-sm { padding: 8px 16px; font-size: 14px; }

/* ---------------- 顶部导航栏 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: all 0.2s ease;
}
.site-header.scrolled {
  box-shadow: var(--shadow-sm);
  background: rgba(255, 255, 255, 0.98);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  color: var(--ink-900);
}
.brand-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary-700), var(--primary-500));
  color: #fff;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.5px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.28);
}
.brand-txt strong {
  display: block;
  font-size: 18px;
  line-height: 1.15;
  color: var(--primary-900);
  letter-spacing: -0.02em;
}
.brand-txt span {
  display: block;
  font-size: 10.5px;
  color: var(--ink-500);
  font-weight: 600;
  letter-spacing: 0.12em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu > li { position: relative; }
.nav-menu > li > a {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-700);
  transition: all 0.18s ease;
}
.nav-menu > li > a:hover,
.nav-menu > li > a.active {
  color: var(--primary-600);
  background: var(--primary-50);
}
.nav-menu > li > a .ico-arrow {
  width: 13px;
  height: 13px;
  stroke-width: 2.5;
  transition: transform 0.2s ease;
}
.nav-menu > li:hover > a .ico-arrow,
.nav-menu > li.dd-open > a .ico-arrow {
  transform: rotate(180deg);
}

/* 下拉菜单 */
.nav-dd {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 240px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all 0.2s ease;
  z-index: 50;
}
.nav-menu > li:hover .nav-dd,
.nav-menu > li.dd-open .nav-dd {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.dd-head {
  padding: 6px 12px 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink-400);
}
.nav-dd a {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--ink-800);
  font-size: 14px;
  font-weight: 600;
  transition: all 0.15s ease;
}
.nav-dd a:hover {
  background: var(--primary-50);
  color: var(--primary-600);
}
.nav-dd a .ico {
  width: 18px;
  height: 18px;
  color: var(--primary-600);
  margin-top: 2px;
}
.nav-dd a .dd-meta {
  display: flex;
  flex-direction: column;
}
.nav-dd a .dd-meta small {
  font-size: 12px;
  font-weight: 400;
  color: var(--ink-500);
  margin-top: 2px;
}

.nav-right { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  color: var(--ink-800);
  cursor: pointer;
}

/* 移动端菜单 */
.mobile-nav {
  position: fixed;
  inset: 72px 0 0;
  background: #fff;
  z-index: 99;
  padding: 20px 24px 60px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.25s ease;
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav a {
  display: block;
  padding: 12px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-900);
  border-bottom: 1px solid var(--line);
}
.mobile-nav .m-group {
  padding: 16px 0 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ink-400);
}
.mobile-nav .m-sub {
  padding-left: 14px;
  font-size: 14.5px;
  color: var(--ink-600);
}

/* ---------------- 通用区块样式 ---------------- */
.band { padding: 90px 0; position: relative; }
.band-soft { background: var(--bg-soft); }
.band-muted { background: var(--bg-muted); }
.band-tint { background: linear-gradient(180deg, var(--primary-50) 0%, #ffffff 100%); }
.band-dark {
  background: var(--primary-900);
  color: #f8fafc;
}
.band-dark h1, .band-dark h2, .band-dark h3 { color: #ffffff; }
.band-dark .sec-sub { color: var(--ink-400); }

.sec-head {
  max-width: 820px;
  margin: 0 auto 56px;
  text-align: center;
}
.sec-head-left {
  text-align: left;
  margin-left: 0;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--primary-50);
  color: var(--primary-600);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: 99px;
  margin-bottom: 14px;
  border: 1px solid var(--primary-100);
}
.band-dark .eyebrow {
  background: rgba(37, 99, 235, 0.2);
  color: #93c5fd;
  border-color: rgba(37, 99, 235, 0.4);
}
.sec-title {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.sec-sub {
  font-size: 17px;
  color: var(--ink-600);
  line-height: 1.68;
}

/* ---------------- 首屏 HERO ---------------- */
.hero {
  padding: 80px 0 90px;
  background: radial-gradient(circle at 50% 10%, #eff6ff 0%, #ffffff 70%);
  border-bottom: 1px solid var(--line);
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: #ffffff;
  border: 1px solid var(--line-strong);
  border-radius: 99px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--primary-700);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}
.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-600);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}
.hero-title {
  font-size: 52px;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--primary-900);
  max-width: 960px;
  margin: 0 auto 22px;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 20px;
  color: var(--ink-600);
  max-width: 820px;
  margin: 0 auto 34px;
  line-height: 1.6;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  max-width: 860px;
  margin: 0 auto 36px;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 15px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 99px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-700);
  box-shadow: var(--shadow-sm);
}
.hero-tag .ico { width: 15px; height: 15px; color: var(--primary-600); }
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
}

/* 首屏综合视觉看板 */
.hero-board {
  max-width: 1060px;
  margin: 0 auto;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  text-align: left;
}
.board-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  background: var(--ink-50);
  border-bottom: 1px solid var(--line);
}
.board-dots { display: flex; gap: 7px; }
.board-dot { width: 11px; height: 11px; border-radius: 50%; background: #cbd5e1; }
.board-dot:nth-child(1) { background: #f87171; }
.board-dot:nth-child(2) { background: #fbbf24; }
.board-dot:nth-child(3) { background: #4ade80; }
.board-title { font-size: 13px; font-weight: 600; color: var(--ink-500); }
.board-body {
  padding: 34px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.board-card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
}
.board-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.board-card-ico {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--primary-100);
  color: var(--primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
}
.board-card h4 { font-size: 16px; margin: 0; color: var(--ink-900); }
.board-card p { font-size: 13.5px; color: var(--ink-600); line-height: 1.55; margin-bottom: 14px; flex: 1; }
.board-card .board-badge {
  display: inline-block;
  padding: 4px 10px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  color: var(--primary-700);
  align-self: flex-start;
}

/* ---------------- 商业价值卡片（第二屏） ---------------- */
.val-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.val-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  box-shadow: var(--shadow-sm);
  transition: all 0.24s ease;
  display: flex;
  flex-direction: column;
}
.val-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-100);
}
.val-card-num {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--primary-600);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.val-card-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--ink-900);
  margin-bottom: 14px;
}
.val-card-desc {
  font-size: 15px;
  color: var(--ink-600);
  line-height: 1.65;
  margin-bottom: 22px;
  flex: 1;
}
.val-card-list {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  margin-bottom: 24px;
}
.val-card-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-700);
  margin-bottom: 8px;
}
.val-card-list li .ico { color: var(--accent-teal); width: 16px; height: 16px; }

/* ---------------- 网格与卡片通用 ---------------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

.box-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}
.box-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
}
.box-ico {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--primary-50);
  color: var(--primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.box-ico .ico { width: 22px; height: 22px; }
.box-title { font-size: 19px; font-weight: 700; margin-bottom: 12px; }
.box-desc { font-size: 14.5px; color: var(--ink-600); line-height: 1.65; }

/* ---------------- GEO 深度对比表 ---------------- */
.compare-box {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-top: 40px;
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}
.compare-table th, .compare-table td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.compare-table th {
  background: var(--ink-50);
  font-weight: 700;
  color: var(--ink-900);
}
.compare-table tr:last-child td { border-bottom: none; }
.col-bad { color: var(--ink-500); }
.col-good { color: var(--primary-700); font-weight: 600; background: rgba(37, 99, 235, 0.03); }

/* ---------------- 案例卡片 ---------------- */
.case-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}
.case-card-head {
  padding: 24px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
}
.case-type {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--primary-600);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.case-card-head h3 { font-size: 19px; margin: 0; color: var(--ink-900); }
.case-card-body {
  padding: 26px 24px;
  flex: 1;
}
.case-flow { display: flex; flex-direction: column; gap: 14px; }
.case-step { display: flex; gap: 12px; }
.step-tag {
  font-size: 12px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  white-space: nowrap;
  height: fit-content;
}
.tag-prob { background: #fee2e2; color: #991b1b; }
.tag-sol { background: #e0f2fe; color: #075985; }
.tag-res { background: #dcfce7; color: #166534; }
.step-txt { font-size: 14px; color: var(--ink-700); line-height: 1.55; }

/* ---------------- FAQ ---------------- */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  background: #ffffff;
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.faq-item.open { border-color: var(--primary-300, #93c5fd); }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink-900);
  cursor: pointer;
  text-align: left;
}
.faq-q .ico {
  transition: transform 0.25s ease;
  color: var(--ink-400);
}
.faq-item.open .faq-q .ico { transform: rotate(180deg); color: var(--primary-600); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.28s ease;
  padding: 0 24px;
  color: var(--ink-600);
  font-size: 15px;
  line-height: 1.65;
}
.faq-item.open .faq-a { padding-bottom: 22px; }

/* ---------------- 咨询表单 ---------------- */
.form-box {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 44px;
  box-shadow: var(--shadow-lg);
  max-width: 680px;
  margin: 0 auto;
}
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-bottom: 18px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: span 2; }
.form-label { font-size: 14px; font-weight: 600; color: var(--ink-800); }
.form-label .req { color: #ef4444; }
.form-control {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  color: var(--ink-900);
  background: #ffffff;
  transition: border-color 0.18s ease;
}
.form-control:focus {
  outline: none;
  border-color: var(--primary-600);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
textarea.form-control { resize: vertical; min-height: 100px; }
.form-hint { font-size: 12.5px; color: var(--ink-500); margin-top: 10px; }
.form-alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-top: 16px;
  display: none;
}
.form-alert.show { display: block; }
.form-alert-ok { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }

/* ---------------- 底部页脚 ---------------- */
.site-footer {
  background: var(--primary-900);
  color: #e2e8f0;
  padding: 80px 0 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}
.footer-about .brand { margin-bottom: 18px; }
.footer-about .brand-txt strong { color: #ffffff; }
.footer-about p {
  color: var(--ink-400);
  font-size: 14px;
  line-height: 1.65;
  max-width: 380px;
}
.footer-col h4 {
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 18px;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: var(--ink-400);
  font-size: 14px;
  transition: color 0.18s ease;
}
.footer-links a:hover { color: #ffffff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 13px;
  color: var(--ink-500);
}
.footer-creds { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-creds a { color: var(--ink-400); }
.footer-creds a:hover { color: #ffffff; }

/* ---------------- 响应式适配 ---------------- */
@media (max-width: 960px) {
  .nav-menu { display: none; }
  .nav-toggle { display: block; }
  .hero-title { font-size: 38px; }
  .hero-sub { font-size: 18px; }
  .hero-board .board-body { grid-template-columns: 1fr; }
  .val-grid { grid-template-columns: 1fr; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .form-grid { grid-template-columns: 1fr; }
  .form-group.full { grid-column: auto; }
}