:root {
  color-scheme: light;
  --page: #f4f6fb;
  --page-deep: #e9edf7;
  --ink: #171925;
  --muted: #5f6679;
  --faint: #81889a;
  --accent: #7158e8;
  --accent-soft: rgba(113, 88, 232, 0.12);
  --blue-soft: rgba(0, 174, 236, 0.12);
  --pink-soft: rgba(251, 114, 153, 0.12);
  --line: rgba(31, 35, 54, 0.1);
  --line-strong: rgba(31, 35, 54, 0.16);
  --glass: rgba(255, 255, 255, 0.74);
  --glass-strong: rgba(255, 255, 255, 0.9);
  --shadow: 0 28px 70px -38px rgba(42, 36, 88, 0.32);
  --shadow-soft: 0 18px 42px -30px rgba(42, 36, 88, 0.25);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --max: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 4%, rgba(113, 88, 232, 0.15), transparent 28rem),
    radial-gradient(circle at 92% 8%, rgba(0, 174, 236, 0.13), transparent 26rem),
    linear-gradient(145deg, var(--page), var(--page-deep));
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.28) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.28) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, black, transparent 75%);
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(113, 88, 232, 0.35);
  outline-offset: 4px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(255, 255, 255, 0.62);
  background: rgba(244, 246, 251, 0.72);
  backdrop-filter: blur(24px) saturate(145%);
}

.header-inner {
  display: flex;
  min-height: 70px;
  align-items: center;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 11px;
  box-shadow: 0 12px 28px -14px rgba(113, 88, 232, 0.72);
}

.brand small {
  display: block;
  margin-top: -3px;
  color: var(--faint);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 5px;
}

.nav a {
  padding: 8px 12px;
  border-radius: 11px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.76);
  transform: translateY(-1px);
}

.hero {
  padding: clamp(68px, 10vw, 118px) 0 54px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid rgba(113, 88, 232, 0.17);
  border-radius: 999px;
  color: #5c49bb;
  background: rgba(255, 255, 255, 0.68);
  box-shadow: var(--shadow-soft);
  font-size: 12px;
  font-weight: 720;
  letter-spacing: 0.08em;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.18;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 820px;
  margin: 22px 0 20px;
  font-size: clamp(38px, 7vw, 70px);
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(25px, 3.6vw, 38px);
}

h3 {
  margin-bottom: 8px;
  font-size: 19px;
}

.lead {
  max-width: 780px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--glass-strong);
  box-shadow: var(--shadow-soft);
  font-size: 14px;
  font-weight: 720;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.button.primary {
  border-color: transparent;
  color: white;
  background: linear-gradient(125deg, #7a62ef, #6550d5);
  box-shadow: 0 20px 44px -24px rgba(91, 68, 207, 0.72);
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 23px 48px -27px rgba(42, 36, 88, 0.36);
}

.content {
  padding: 16px 0 88px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

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

.panel {
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid rgba(255, 255, 255, 0.88);
  border-radius: var(--radius-xl);
  background: var(--glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px) saturate(140%);
}

.panel p:last-child,
.card p:last-child {
  margin-bottom: 0;
}

.card {
  min-height: 100%;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.67);
  box-shadow: var(--shadow-soft);
}

.card p,
.panel p,
.panel li,
.note {
  color: var(--muted);
}

.section {
  margin-top: 22px;
}

.section-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.7);
  font-size: 12px;
  font-weight: 680;
}

.answer {
  margin: 0;
  color: var(--ink);
  font-size: 17px;
  font-weight: 620;
}

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

details {
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow-soft);
}

summary {
  position: relative;
  padding: 20px 52px 20px 22px;
  cursor: pointer;
  font-weight: 750;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  position: absolute;
  top: 50%;
  right: 20px;
  width: 26px;
  height: 26px;
  border-radius: 9px;
  color: var(--accent);
  background: var(--accent-soft);
  content: "+";
  line-height: 25px;
  text-align: center;
  transform: translateY(-50%);
}

details[open] summary::after {
  content: "–";
}

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

.steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  counter-reset: steps;
  list-style: none;
}

.steps li {
  position: relative;
  min-height: 54px;
  padding: 16px 18px 16px 68px;
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: var(--radius-lg);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.66);
  counter-increment: steps;
}

.steps li::before {
  position: absolute;
  top: 14px;
  left: 16px;
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 12px;
  color: white;
  background: linear-gradient(135deg, #7a62ef, #6550d5);
  content: counter(steps);
  font-weight: 800;
}

.callout {
  padding: 18px 20px;
  border: 1px solid rgba(0, 174, 236, 0.18);
  border-radius: var(--radius-md);
  color: #34586b;
  background: var(--blue-soft);
}

.warning {
  border-color: rgba(251, 114, 153, 0.22);
  color: #704353;
  background: var(--pink-soft);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

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

.data-table td {
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  padding: 24px 0 40px;
  color: var(--faint);
  font-size: 12px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links a:hover {
  color: var(--accent);
}

@media (max-width: 820px) {
  .nav {
    display: none;
  }

  .grid,
  .grid.three {
    grid-template-columns: 1fr;
  }

  .data-table {
    display: block;
    overflow-x: auto;
  }
}

@media (max-width: 560px) {
  .shell {
    width: min(calc(100% - 22px), var(--max));
  }

  .hero {
    padding-top: 52px;
  }

  h1 {
    font-size: 38px;
  }

  .panel,
  .card {
    border-radius: 20px;
  }

  .footer-inner {
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}