:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #64748b;
  --line: rgba(23, 32, 51, 0.1);
  --surface: rgba(255, 255, 255, 0.9);
  --surface-solid: #ffffff;
  --canvas: #f4f7ff;
  --primary: #2f5bff;
  --primary-dark: #2044cf;
  --violet: #8b5cf6;
  --cyan: #06b6d4;
  --green: #16a36a;
  --orange: #f59e0b;
  --shadow: 0 24px 70px rgba(47, 91, 255, 0.12);
  --radius-lg: 28px;
  --radius-md: 20px;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% -4%, rgba(6, 182, 212, 0.16), transparent 28rem),
    radial-gradient(circle at 88% 4%, rgba(139, 92, 246, 0.14), transparent 30rem),
    var(--canvas);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--primary-dark);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: white;
  background: var(--ink);
  border-radius: 10px;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.7);
  background: rgba(244, 247, 255, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 40px), var(--max-width));
  min-height: 72px;
  margin: 0 auto;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  box-shadow: 0 8px 20px rgba(47, 91, 255, 0.25);
}

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

.nav-links a {
  padding: 8px 12px;
  color: var(--muted);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--primary);
  background: rgba(47, 91, 255, 0.09);
}

.page-shell {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
}

.hero {
  position: relative;
  overflow: hidden;
  margin: 38px 0 28px;
  padding: clamp(34px, 6vw, 68px);
  color: white;
  border-radius: 34px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.14), transparent 42%),
    linear-gradient(135deg, #224be6 0%, #2f5bff 48%, #7445e8 100%);
  box-shadow: var(--shadow);
}

.hero::before,
.hero::after {
  position: absolute;
  content: "";
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
}

.hero::before {
  width: 320px;
  height: 320px;
  top: -190px;
  right: -60px;
}

.hero::after {
  width: 220px;
  height: 220px;
  right: 110px;
  bottom: -180px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  padding: 6px 11px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  content: "";
  border-radius: 50%;
  background: #7ff4ce;
  box-shadow: 0 0 0 5px rgba(127, 244, 206, 0.13);
}

.hero h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(34px, 6vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.hero p {
  max-width: 720px;
  margin: 20px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(16px, 2vw, 19px);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 26px;
  color: rgba(255, 255, 255, 0.74);
  font-size: 13px;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.hero-meta span::before {
  width: 5px;
  height: 5px;
  content: "";
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
}

.summary-grid,
.feature-grid,
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0 0 28px;
}

.summary-card,
.feature-card,
.contact-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: 0 12px 35px rgba(23, 32, 51, 0.05);
}

.summary-card strong,
.feature-card h3,
.contact-card h3 {
  display: block;
  margin: 0 0 6px;
  font-size: 17px;
}

.summary-card p,
.feature-card p,
.contact-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.icon-tile {
  display: grid;
  width: 42px;
  height: 42px;
  margin-bottom: 14px;
  place-items: center;
  color: var(--primary);
  border-radius: 13px;
  background: rgba(47, 91, 255, 0.09);
  font-size: 21px;
  font-weight: 800;
}

.content-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  align-items: start;
  gap: 24px;
  margin-bottom: 64px;
}

.table-of-contents {
  position: sticky;
  top: 96px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
}

.table-of-contents strong {
  display: block;
  margin-bottom: 9px;
  font-size: 13px;
  letter-spacing: 0.06em;
}

.table-of-contents a {
  display: block;
  padding: 6px 8px;
  color: var(--muted);
  border-radius: 8px;
  font-size: 13px;
  text-decoration: none;
}

.table-of-contents a:hover {
  color: var(--primary);
  background: rgba(47, 91, 255, 0.07);
}

.article {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface-solid);
  box-shadow: 0 18px 52px rgba(23, 32, 51, 0.06);
}

.article-section {
  padding: clamp(24px, 5vw, 46px);
  scroll-margin-top: 96px;
}

.article-section + .article-section {
  border-top: 1px solid var(--line);
}

.section-number {
  display: inline-grid;
  width: 30px;
  height: 30px;
  margin-right: 9px;
  place-items: center;
  color: var(--primary);
  border-radius: 10px;
  background: rgba(47, 91, 255, 0.09);
  font-size: 13px;
  vertical-align: 3px;
}

.article h2 {
  margin: 0 0 16px;
  font-size: clamp(22px, 3vw, 29px);
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.article h3 {
  margin: 26px 0 8px;
  font-size: 17px;
}

.article p,
.article li {
  color: #3f4c63;
}

.article ul,
.article ol {
  padding-left: 1.35em;
}

.article li + li {
  margin-top: 8px;
}

.notice {
  margin: 20px 0 0;
  padding: 17px 18px;
  color: #29415d;
  border: 1px solid rgba(6, 182, 212, 0.18);
  border-radius: 15px;
  background: rgba(6, 182, 212, 0.07);
}

.notice strong {
  color: #0e6680;
}

.data-table-wrap {
  overflow-x: auto;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.data-table th {
  color: var(--ink);
  background: #f7f9fe;
  font-size: 13px;
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--green);
  font-weight: 700;
  white-space: nowrap;
}

.status::before {
  width: 7px;
  height: 7px;
  content: "";
  border-radius: 50%;
  background: currentColor;
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-bottom: 30px;
}

.faq-list details {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface-solid);
  box-shadow: 0 10px 28px rgba(23, 32, 51, 0.04);
}

.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 19px 22px;
  cursor: pointer;
  font-weight: 720;
  list-style: none;
}

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

.faq-list summary::after {
  content: "+";
  color: var(--primary);
  font-size: 24px;
  font-weight: 400;
  line-height: 1;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 22px 20px;
  color: var(--muted);
  font-size: 15px;
}

.faq-answer p {
  margin: 0;
}

.faq-answer ol,
.faq-answer ul {
  margin-bottom: 0;
  padding-left: 1.35em;
}

.support-heading {
  margin: 44px 0 18px;
  font-size: clamp(25px, 4vw, 34px);
  letter-spacing: -0.03em;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 18px;
  color: white;
  border-radius: 14px;
  background: var(--primary);
  font-weight: 720;
  text-decoration: none;
  box-shadow: 0 9px 22px rgba(47, 91, 255, 0.22);
}

.button:hover {
  color: white;
  background: var(--primary-dark);
}

.button.secondary {
  color: var(--primary);
  background: rgba(47, 91, 255, 0.09);
  box-shadow: none;
}

.button.secondary:hover {
  color: var(--primary-dark);
  background: rgba(47, 91, 255, 0.14);
}

.hero .button {
  color: var(--primary-dark);
  background: white;
  box-shadow: 0 10px 26px rgba(20, 35, 96, 0.22);
}

.hero .button:hover {
  color: #1738b8;
  background: #f1f5ff;
}

.hero .button.secondary {
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.38);
  background: rgba(255, 255, 255, 0.12);
  box-shadow: none;
}

.hero .button.secondary:hover {
  color: white;
  background: rgba(255, 255, 255, 0.2);
}

.contact-card.featured {
  grid-column: span 2;
  color: white;
  border-color: transparent;
  background: linear-gradient(135deg, #172033, #263656);
}

.contact-card.featured p {
  color: rgba(255, 255, 255, 0.7);
}

.contact-card.featured a {
  color: #a9c0ff;
}

.site-footer {
  margin-top: 72px;
  padding: 32px 0 44px;
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
  gap: 24px;
}

.footer-copy {
  color: var(--muted);
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  font-size: 13px;
}

@media (max-width: 820px) {
  .summary-grid,
  .feature-grid,
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }

  .content-layout {
    grid-template-columns: 1fr;
  }

  .table-of-contents {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .table-of-contents strong {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  .nav {
    width: min(calc(100% - 28px), var(--max-width));
    min-height: 64px;
  }

  .brand span {
    display: none;
  }

  .nav-links {
    gap: 2px;
  }

  .nav-links a {
    padding: 7px 9px;
    font-size: 13px;
  }

  .page-shell {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .hero {
    margin-top: 22px;
    padding: 30px 24px 34px;
    border-radius: 25px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .summary-grid,
  .feature-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .contact-card.featured {
    grid-column: auto;
  }

  .table-of-contents {
    grid-template-columns: 1fr;
  }

  .article {
    border-radius: 22px;
  }

  .article-section {
    padding: 25px 21px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    width: min(calc(100% - 28px), var(--max-width));
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

@media print {
  body {
    background: white;
  }

  .site-header,
  .table-of-contents,
  .button-row,
  .site-footer {
    display: none;
  }

  .page-shell {
    width: 100%;
  }

  .hero {
    margin: 0 0 20px;
    padding: 24px;
    color: var(--ink);
    background: #f3f5fa;
    box-shadow: none;
  }

  .hero p,
  .hero-meta {
    color: var(--muted);
  }

  .content-layout {
    display: block;
  }

  .article {
    border: 0;
    box-shadow: none;
  }
}