:root {
  --commercial-bg: #f5f7fb;
  --commercial-card: #ffffff;
  --commercial-text: #172033;
  --commercial-muted: #657089;
  --commercial-border: #e4e9f2;
  --commercial-primary: #2457d6;
  --commercial-primary-dark: #173fa6;
  --commercial-accent: #f59e0b;
  --commercial-success: #0f9f6e;
  --commercial-danger: #c2413a;
  --commercial-radius: 18px;
  --commercial-shadow: 0 12px 36px rgba(35, 59, 110, .10);
}

* { box-sizing: border-box; }

.commercial-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.commercial-top-notice {
  position: relative;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 42px;
  padding: 9px 16px;
  color: #fff;
  background: #172033;
  font-size: 13px;
  line-height: 1.5;
  text-align: center;
}

.commercial-top-notice strong {
  color: #ffd78b;
}

.commercial-addon {
  color: var(--commercial-text);
  background: var(--commercial-bg);
  padding: 56px 0 72px;
}

.commercial-addon a,
.commercial-info-page a {
  text-decoration: none;
}

.commercial-section {
  margin: 0 0 36px;
}

.commercial-section-title {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.commercial-section-title h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: -.03em;
}

.commercial-section-title p {
  max-width: 680px;
  margin: 8px 0 0;
  color: var(--commercial-muted);
  line-height: 1.8;
}

.commercial-metric-grid,
.commercial-feature-grid,
.commercial-link-grid {
  display: grid;
  gap: 16px;
}

.commercial-metric-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.commercial-feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.commercial-link-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.commercial-card {
  border: 1px solid var(--commercial-border);
  border-radius: var(--commercial-radius);
  background: var(--commercial-card);
  box-shadow: var(--commercial-shadow);
}

.commercial-metric {
  padding: 22px;
}

.commercial-metric b {
  display: block;
  margin-bottom: 4px;
  color: var(--commercial-primary);
  font-size: 31px;
  line-height: 1.15;
}

.commercial-metric span,
.commercial-metric small {
  display: block;
}

.commercial-metric span {
  font-weight: 700;
}

.commercial-metric small {
  margin-top: 8px;
  color: var(--commercial-muted);
  line-height: 1.55;
}

.commercial-feature {
  min-height: 214px;
  padding: 26px;
}

.commercial-feature-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 17px;
  border-radius: 14px;
  color: #fff;
  background: var(--commercial-primary);
  font-size: 21px;
  font-weight: 800;
}

.commercial-feature h3 {
  margin: 0 0 10px;
  font-size: 19px;
}

.commercial-feature p {
  margin: 0;
  color: var(--commercial-muted);
  line-height: 1.8;
}

.commercial-link-card {
  display: block;
  padding: 22px;
  color: var(--commercial-text);
  transition: transform .18s ease, box-shadow .18s ease;
}

.commercial-link-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 42px rgba(35, 59, 110, .16);
}

.commercial-link-card b {
  display: block;
  margin-bottom: 7px;
  font-size: 17px;
}

.commercial-link-card span {
  color: var(--commercial-muted);
  line-height: 1.65;
  font-size: 14px;
}

.commercial-grade-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.commercial-grade {
  padding: 26px;
}

.commercial-grade-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 70px;
  height: 32px;
  padding: 0 13px;
  border-radius: 999px;
  color: #fff;
  font-weight: 800;
}

.commercial-grade-a .commercial-grade-label { background: var(--commercial-success); }
.commercial-grade-b .commercial-grade-label { background: var(--commercial-primary); }

.commercial-grade h3 {
  margin: 16px 0 8px;
}

.commercial-grade p {
  margin: 0;
  color: var(--commercial-muted);
  line-height: 1.8;
}

.commercial-warning {
  padding: 19px 22px;
  border: 1px solid #f4d29b;
  border-radius: 15px;
  background: #fff8eb;
  color: #76501a;
  line-height: 1.75;
}

.commercial-cta {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 30px;
  border-radius: 22px;
  color: #fff;
  background: linear-gradient(135deg, var(--commercial-primary), var(--commercial-primary-dark));
  box-shadow: var(--commercial-shadow);
}

.commercial-cta h2 {
  margin: 0 0 8px;
}

.commercial-cta p {
  margin: 0;
  color: rgba(255,255,255,.82);
  line-height: 1.75;
}

.commercial-button,
.commercial-button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 0;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
}

.commercial-button {
  color: var(--commercial-primary-dark);
  background: #fff;
}

.commercial-button-secondary {
  color: #fff;
  background: var(--commercial-primary);
}

.commercial-legal-footer {
  padding: 34px 0 26px;
  color: #d7ddeb;
  background: #10182a;
}

.commercial-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 30px;
}

.commercial-footer-grid b {
  color: #fff;
}

.commercial-footer-grid p {
  max-width: 660px;
  color: #9eabc3;
  line-height: 1.75;
}

.commercial-footer-links {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 12px 18px;
}

.commercial-footer-links a {
  color: #d7ddeb;
}

.commercial-copyright {
  margin: 25px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.10);
  color: #8190aa !important;
  font-size: 13px;
}

.commercial-float-contact {
  position: fixed;
  right: 22px;
  bottom: 24px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 112px;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  color: #fff !important;
  background: var(--commercial-primary);
  box-shadow: 0 14px 30px rgba(36, 87, 214, .30);
  font-weight: 800;
}

.commercial-mobile-nav {
  display: none;
}

.commercial-info-page {
  margin: 0;
  color: var(--commercial-text);
  background: var(--commercial-bg);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

.commercial-page-header {
  position: sticky;
  top: 0;
  z-index: 70;
  border-bottom: 1px solid var(--commercial-border);
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(14px);
}

.commercial-page-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.commercial-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--commercial-text);
}

.commercial-brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  color: #fff;
  background: var(--commercial-primary);
  font-weight: 800;
}

.commercial-brand b,
.commercial-brand small {
  display: block;
}

.commercial-brand small {
  margin-top: 3px;
  color: var(--commercial-muted);
  font-size: 12px;
}

.commercial-page-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.commercial-page-nav a {
  color: var(--commercial-text);
  font-size: 14px;
}

.commercial-article {
  min-height: 62vh;
  padding-top: 48px;
  padding-bottom: 66px;
}

.commercial-article-hero {
  margin-bottom: 26px;
  padding: 34px;
}

.commercial-kicker {
  margin: 0 0 10px;
  color: var(--commercial-primary);
  font-weight: 800;
}

.commercial-article h1 {
  margin: 0 0 14px;
  font-size: clamp(30px, 4vw, 44px);
  letter-spacing: -.04em;
}

.commercial-article-lead {
  max-width: 800px;
  margin: 0;
  color: var(--commercial-muted);
  line-height: 1.9;
}

.commercial-article-section {
  margin-top: 18px;
  padding: 28px 30px;
}

.commercial-article-section h2 {
  margin: 0 0 15px;
  font-size: 23px;
}

.commercial-article-section h3 {
  margin: 22px 0 9px;
}

.commercial-article-section p,
.commercial-article-section li {
  color: #4c5870;
  line-height: 1.9;
}

.commercial-article-section ul,
.commercial-article-section ol {
  padding-left: 22px;
}

.commercial-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
  overflow: hidden;
  border-radius: 13px;
}

.commercial-table th,
.commercial-table td {
  padding: 14px 15px;
  border: 1px solid var(--commercial-border);
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
}

.commercial-table th {
  background: #f1f5fb;
}

.commercial-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.commercial-field {
  display: grid;
  gap: 7px;
}

.commercial-field-full {
  grid-column: 1 / -1;
}

.commercial-field label {
  font-weight: 700;
}

.commercial-field input,
.commercial-field select,
.commercial-field textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid #cfd7e6;
  border-radius: 10px;
  background: #fff;
  color: var(--commercial-text);
  font: inherit;
}

.commercial-field textarea {
  min-height: 110px;
  resize: vertical;
}

.commercial-consent {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--commercial-muted);
  line-height: 1.7;
}

.commercial-consent input {
  margin-top: 5px;
}

.commercial-form-status {
  display: none;
  margin-top: 15px;
  padding: 12px 14px;
  border-radius: 10px;
  line-height: 1.7;
}

.commercial-form-status.is-success {
  display: block;
  color: #096746;
  background: #e8f7f1;
}

.commercial-form-status.is-error {
  display: block;
  color: #9f2f2a;
  background: #fff0ef;
}

@media (max-width: 900px) {
  .commercial-metric-grid,
  .commercial-link-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .commercial-feature-grid {
    grid-template-columns: 1fr;
  }

  .commercial-page-nav {
    display: none;
  }
}

@media (max-width: 640px) {
  body {
    padding-bottom: 64px;
  }

  .commercial-shell {
    width: min(100% - 22px, 1180px);
  }

  .commercial-top-notice {
    align-items: flex-start;
    flex-direction: column;
    gap: 2px;
    padding: 8px 12px;
    text-align: left;
  }

  .commercial-addon {
    padding: 38px 0 46px;
  }

  .commercial-metric-grid,
  .commercial-link-grid,
  .commercial-grade-row,
  .commercial-footer-grid,
  .commercial-form,
  .commercial-cta {
    grid-template-columns: 1fr;
  }

  .commercial-metric,
  .commercial-feature,
  .commercial-link-card,
  .commercial-grade,
  .commercial-article-hero,
  .commercial-article-section {
    padding: 20px;
  }

  .commercial-section-title {
    align-items: flex-start;
    flex-direction: column;
  }

  .commercial-cta {
    padding: 24px;
  }

  .commercial-page-header-inner {
    min-height: 64px;
  }

  .commercial-brand b {
    font-size: 14px;
  }

  .commercial-brand small {
    display: none;
  }

  .commercial-float-contact {
    display: none;
  }

  .commercial-mobile-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 100;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    min-height: 58px;
    border-top: 1px solid var(--commercial-border);
    background: rgba(255,255,255,.98);
    box-shadow: 0 -6px 24px rgba(20,30,60,.08);
  }

  .commercial-mobile-nav a {
    display: grid;
    place-items: center;
    color: #42506a;
    font-size: 12px;
    font-weight: 700;
  }

  .commercial-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}