/* ===== Base ===== */
:root {
  --bg1: #f7f9fc;
  --bg2: #edf3fa;
  --card: rgba(255,255,255,0.92);
  --card-solid: #ffffff;
  --text: #1d1d1f;
  --sub: #667085;
  --muted: #94a3b8;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --light: #eef4ff;
  --light-hover: #e2ebff;
  --border: #e5e7eb;
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 8px 24px rgba(15, 23, 42, 0.05);
  --success: #16a34a;
  --danger: #dc2626;
  --maxw: 1220px;
  --radius-xl: 28px;
  --radius-lg: 20px;
}
* { box-sizing: border-box; margin: 0; padding: 0; -webkit-font-smoothing: antialiased; }
html { scroll-behavior: smooth; }
body {
  min-height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg1) 0%, var(--bg2) 100%);
  padding: 14px 10px 30px;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.page { width: min(var(--maxw), 100%); margin: 0 auto; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Header ===== */
.topbar {
  position: sticky;
  top: 12px;
  z-index: 50;
  margin-bottom: 18px;
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid rgba(255,255,255,0.62);
  border-radius: 18px;
  box-shadow: 0 8px 24px rgba(15,23,42,0.04);
}
.topbar-inner {
  min-height: 72px;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background: linear-gradient(180deg, #eff6ff 0%, #dbeafe 100%);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  flex-shrink: 0;
}
.brand-info { min-width: 0; }
.brand-title {
  display: block;
  font-size: 18px;
  font-weight: 800;
  color: #0f172a;
  line-height: 1.2;
}
.brand-sub {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: var(--sub);
  line-height: 1.5;
}
.nav-wrap { display: flex; align-items: center; gap: 10px; }
.nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.nav a {
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 14px;
  color: #475569;
  transition: .2s ease;
}
.nav a:hover,
.nav a.active { background: var(--light); color: var(--primary); }
.nav-cta,
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 14px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  transition: .2s ease;
  border: none;
  cursor: pointer;
}
.nav-cta:hover,
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-light {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 14px;
  background: var(--light);
  color: #334155;
  font-size: 14px;
  font-weight: 700;
  transition: .2s ease;
}
.btn-light:hover { background: var(--light-hover); transform: translateY(-1px); }
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  color: #334155;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  line-height: 1;
}
.mobile-nav { display: none; padding: 0 14px 14px; }
.mobile-nav.show { display: block; }
.mobile-nav-inner {
  border-top: 1px solid rgba(0,0,0,0.05);
  padding-top: 12px;
  display: grid;
  gap: 8px;
}
.mobile-nav a {
  padding: 12px 14px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--border);
  color: #475569;
  font-size: 14px;
  font-weight: 600;
}
.mobile-nav a:last-child { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== Sections ===== */
.hero {
  background: var(--card);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid rgba(255,255,255,0.62);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  padding: 34px 28px 28px;
  margin-bottom: 20px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  background: #f8fafc;
  border: 1px solid var(--border);
  color: #475569;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 16px;
}
.hero-title {
  margin: 0 0 8px;
  font-size: clamp(2.4rem, 5vw, 4.3rem);
  line-height: 1.03;
  letter-spacing: -0.04em;
  font-weight: 900;
  color: var(--primary);
}
.hero-services {
  margin: 0 0 14px;
  font-size: clamp(1.1rem, 2vw, 1.9rem);
  line-height: 1.35;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: #0f172a;
}
.lead {
  max-width: 900px;
  margin: 0 0 18px;
  color: #475569;
  font-size: 16px;
  line-height: 1.95;
}
.hero-actions,
.contact-links,
.cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-actions { margin-bottom: 16px; }
.hero-tags,
.tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  background: #f8fafc;
  border: 1px solid var(--border);
  color: #475569;
  font-size: 13px;
  font-weight: 700;
}
.hero-summary,
.grid-4,
.grid-3,
.grid-2,
.process-grid,
.contact-layout,
.field-grid-2,
.metrics,
.cta-grid {
  display: grid;
  gap: 14px;
}
.hero-summary,
.grid-2,
.cta-grid { grid-template-columns: 1fr 1fr; }
.grid-3,
.process-grid { grid-template-columns: repeat(3, 1fr); }
.grid-4,
.metrics { grid-template-columns: repeat(4, 1fr); }
.hero .metrics { margin-top: 28px; }
.contact-layout { grid-template-columns: 1.08fr 0.92fr; }
.field-grid-2 { grid-template-columns: 1fr 1fr; }
.section { margin-top: 20px; }
.card,
.hero-panel,
.mini-card,
.metric,
.contact-main,
.contact-side,
.summary-card,
.cta-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}
.card { overflow: hidden; }
.hero-panel,
.summary-card,
.mini-card,
.cta-card,
.contact-main,
.contact-side { padding: 20px; }
.metric { padding: 16px; }
.section-head {
  padding: 18px 22px;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  background: rgba(255,255,255,0.72);
}
.section-head h2 {
  font-size: 24px;
  color: #0f172a;
  margin-bottom: 8px;
}
.section-head p,
.hero-panel p,
.summary-card p,
.mini-card p,
.cta-card p,
.contact-main > p,
.contact-side > p,
.timeline p,
.list-plain li,
.mini-card li,
.cta-card li {
  color: #475569;
  font-size: 14px;
  line-height: 1.9;
}
.section-body { padding: 22px; }
.hero-panel h3,
.summary-card h3,
.mini-card h3,
.cta-card h3,
.contact-main h3,
.contact-side h3 {
  font-size: 18px;
  color: #0f172a;
  margin-bottom: 12px;
}
.metric-num {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.1;
  color: #0f172a;
}
.metric-text {
  margin-top: 6px;
  color: var(--sub);
  font-size: 13px;
  line-height: 1.7;
}
.list-plain,
.mini-card ul,
.cta-card ul,
.hero-panel ul,
.summary-card ul { padding-left: 18px; }
.list-plain li + li,
.mini-card li + li,
.cta-card li + li,
.hero-panel li + li,
.summary-card li + li { margin-top: 8px; }
.step-no {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: #dbeafe;
  color: var(--primary);
  font-size: 14px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}
.check-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 10px;
}
.check-list li {
  position: relative;
  padding-left: 18px;
  color: #475569;
  font-size: 14px;
  line-height: 1.9;
}
.check-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--primary);
}
.stack-cards {
  display: grid;
  gap: 16px;
}
.stack-cards .mini-card {
  margin-top: 0;
  height: auto;
}
/* 保险修正：如果后续又有单独堆叠 mini-card，也保持固定间距 */
.stack-cards > .mini-card + .mini-card,
.contact-side > .mini-card + .mini-card {
  margin-top: 0;
}
.faq details {
  border-top: 1px solid #eef2f7;
  padding: 14px 0;
}
.faq details:first-child { border-top: none; padding-top: 0; }
.faq summary {
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: #1e293b;
}
.faq summary::-webkit-details-marker { display: none; }
.faq .answer {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.95;
  color: #475569;
}
.timeline {
  border-left: 2px solid #dbeafe;
  padding-left: 16px;
}
.timeline-item + .timeline-item { margin-top: 16px; }
.timeline-item h3 {
  font-size: 17px;
  color: #0f172a;
  margin-bottom: 8px;
}
.cta-band {
  background: linear-gradient(180deg, rgba(239,246,255,0.95) 0%, rgba(255,255,255,0.96) 100%);
  border: 1px solid #dbeafe;
}
.mini-note {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.8;
}

/* ===== Contact form ===== */
.contact-form { margin-top: 16px; display: grid; gap: 12px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-size: 13px; font-weight: 700; color: #334155; }
.input,
.select,
.textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
  color: var(--text);
  padding: 13px 14px;
  font-size: 14px;
  outline: none;
  transition: .2s ease;
  font-family: inherit;
}
.input:focus,
.select:focus,
.textarea:focus {
  border-color: #93c5fd;
  box-shadow: 0 0 0 4px rgba(37,99,235,0.08);
}
.textarea { min-height: 140px; resize: vertical; line-height: 1.8; }
.ip-status {
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.8;
  color: var(--sub);
}
.form-note {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.8;
}
.result {
  display: none;
  padding: 14px;
  border-radius: 14px;
  font-size: 13px;
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-word;
  border: 1px solid transparent;
  background: #f8fafc;
}
.result.ok { color: #166534; background: #ecfdf5; border-color: #bbf7d0; }
.result.err { color: #991b1b; background: #fef2f2; border-color: #fecaca; }
.contact-meta {
  display: grid;
  gap: 10px;
  margin-top: 4px;
}
.contact-meta-item {
  color: #475569;
  font-size: 14px;
  line-height: 1.85;
  word-break: break-all;
}

/* ===== Footer ===== */
.footer {
  margin-top: 20px;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 18px 20px;
  color: var(--sub);
  font-size: 13px;
  line-height: 1.9;
  text-align: center;
}
.footer a { color: #475569; }
.footer a:hover { color: var(--primary); }
.footer-links {
  display: flex;
  justify-content: center;
  gap: 10px 14px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ===== 404 ===== */
.page-404 body,
body.page-404 {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}
.page-404-wrap { width: 100%; max-width: 760px; }
.page-404-card {
  background: var(--card);
  border: 1px solid rgba(255,255,255,0.62);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 40px 32px;
  text-align: center;
}
.page-404-code {
  font-size: clamp(3rem, 8vw, 5rem);
  line-height: 1;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -0.05em;
  margin-bottom: 12px;
}
.page-404-title {
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  line-height: 1.3;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 14px;
}
.page-404-desc {
  max-width: 560px;
  margin: 0 auto 20px;
  color: #475569;
  font-size: 16px;
  line-height: 1.9;
}
.page-404-countdown {
  display: inline-block;
  padding: 12px 16px;
  border-radius: 14px;
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  color: #334155;
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 22px;
}
.page-404-countdown strong { color: var(--primary); font-weight: 800; }
.page-404-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .grid-4,
  .grid-3,
  .metrics,
  .process-grid,
  .contact-layout,
  .hero-summary,
  .cta-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .nav, .nav-cta { display: none; }
  .menu-toggle { display: inline-flex; }
}
@media (max-width: 860px) {
  .topbar-inner,
  .hero,
  .section-head,
  .section-body,
  .footer { padding-left: 16px; padding-right: 16px; }
  .hero { padding-top: 24px; padding-bottom: 22px; }
  .hero-title { font-size: clamp(2rem, 9vw, 3rem); margin-bottom: 6px; }
  .hero-services { font-size: clamp(1rem, 4.8vw, 1.35rem); margin-bottom: 12px; }
  .lead { font-size: 15px; line-height: 1.9; }
  .hero-actions,
  .contact-links,
  .cta-actions { width: 100%; }
  .hero-summary,
  .grid-4,
  .grid-3,
  .grid-2,
  .metrics,
  .process-grid,
  .contact-layout,
  .field-grid-2,
  .cta-grid { grid-template-columns: 1fr; }
  .btn-primary,
  .btn-light,
  .nav-cta,
  .hero-actions a,
  .contact-links a,
  .page-404-actions a { width: 100%; }
  .page-404-card { padding: 32px 20px; border-radius: 24px; }
}

.mt-14 { margin-top: 14px; }