:root {
  color-scheme: dark;
  --canvas: #0b0f12;
  --surface: #141b20;
  --surface-elevated: #1b252b;
  --mint: #5be0b7;
  --mint-ink: #071310;
  --amber: #f6b45f;
  --danger: #ff6b6b;
  --text: #f4f7f6;
  --muted: #aab7b9;
  --stroke: #33434a;
  --stroke-soft: rgba(150, 165, 168, 0.18);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  --radius-control: 12px;
  --radius-card: 20px;
  --radius-modal: 28px;
  --page: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--canvas);
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 9% 2%, rgba(91, 224, 183, 0.12), transparent 28rem),
    radial-gradient(circle at 94% 16%, rgba(246, 180, 95, 0.08), transparent 24rem),
    var(--canvas);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--mint);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #84ebcb;
}

a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
  border-radius: 8px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  transform: translateY(-160%);
  border-radius: var(--radius-control);
  background: var(--mint);
  color: var(--mint-ink);
  font-weight: 700;
}

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

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

.site-header {
  position: relative;
  z-index: 10;
  padding: 24px 0 8px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 56px;
  padding: 8px 10px 8px 12px;
  border: 1px solid var(--stroke-soft);
  border-radius: 18px;
  background: rgba(20, 27, 32, 0.82);
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-size: 16px;
  font-weight: 750;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid rgba(91, 224, 183, 0.38);
  border-radius: 14px;
  background: linear-gradient(145deg, rgba(91, 224, 183, 0.2), rgba(91, 224, 183, 0.06));
  color: var(--mint);
  font-family: "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
  font-size: 19px;
  font-weight: 800;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.08);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 14px;
  border-radius: 12px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  background: var(--surface-elevated);
  color: var(--text);
}

.hero {
  position: relative;
  overflow: hidden;
  margin: 24px 0 32px;
  padding: clamp(40px, 7vw, 80px) clamp(24px, 7vw, 72px);
  border: 1px solid rgba(91, 224, 183, 0.2);
  border-radius: var(--radius-modal);
  background:
    linear-gradient(135deg, rgba(91, 224, 183, 0.11), transparent 44%),
    linear-gradient(315deg, rgba(246, 180, 95, 0.07), transparent 40%),
    var(--surface);
  box-shadow: var(--shadow);
}

.hero::before,
.hero::after {
  position: absolute;
  content: "";
  border-radius: 999px;
  pointer-events: none;
}

.hero::before {
  top: -86px;
  right: -50px;
  width: 240px;
  height: 240px;
  border: 1px solid rgba(91, 224, 183, 0.15);
}

.hero::after {
  right: 62px;
  bottom: -112px;
  width: 190px;
  height: 190px;
  border: 1px solid rgba(246, 180, 95, 0.13);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--mint);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 6px rgba(91, 224, 183, 0.1);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--text);
  font-family: "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
  letter-spacing: -0.025em;
}

h1 {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: clamp(38px, 6.5vw, 64px);
  line-height: 1.08;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(24px, 3vw, 30px);
  line-height: 1.25;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.35;
}

.hero-lead {
  max-width: 680px;
  margin: 0;
  color: #c6d0d1;
  font-size: clamp(18px, 2.2vw, 21px);
  line-height: 1.65;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.chip {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  padding: 6px 12px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  background: rgba(11, 15, 18, 0.38);
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.chip.mint {
  border-color: rgba(91, 224, 183, 0.28);
  color: var(--mint);
}

.chip.amber {
  border-color: rgba(246, 180, 95, 0.28);
  color: var(--amber);
}

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

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  font-size: 16px;
  font-weight: 750;
  text-decoration: none;
}

.button-primary {
  background: var(--mint);
  color: var(--mint-ink);
  box-shadow: 0 10px 30px rgba(91, 224, 183, 0.15);
}

.button-primary:hover {
  background: #78e7c5;
  color: var(--mint-ink);
}

.button-secondary {
  border-color: var(--stroke);
  background: rgba(20, 27, 32, 0.72);
  color: var(--text);
}

.button-secondary:hover {
  border-color: #496069;
  color: var(--text);
}

.trust-grid,
.quick-grid,
.contact-grid {
  display: grid;
  gap: 16px;
}

.trust-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 32px;
}

.quick-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.contact-grid {
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
}

.mini-card,
.card,
.quick-card,
.contact-card {
  border: 1px solid var(--stroke-soft);
  background: var(--surface);
  box-shadow: 0 18px 54px rgba(0, 0, 0, 0.16);
}

.mini-card {
  padding: 22px;
  border-radius: var(--radius-card);
}

.mini-card strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
  font-size: 16px;
}

.mini-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.mini-icon,
.quick-icon {
  display: grid;
  place-items: center;
  border: 1px solid rgba(91, 224, 183, 0.24);
  background: rgba(91, 224, 183, 0.08);
  color: var(--mint);
  font-family: "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
  font-weight: 800;
}

.mini-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 18px;
  border-radius: 13px;
  font-size: 15px;
}

.content-layout {
  display: grid;
  grid-template-columns: 224px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 20px;
  padding: 18px;
  border: 1px solid var(--stroke-soft);
  border-radius: var(--radius-card);
  background: rgba(20, 27, 32, 0.86);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.toc-title {
  margin: 0 0 10px;
  color: var(--text);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
}

.toc a:hover {
  color: var(--mint);
}

.content-stack {
  display: grid;
  gap: 20px;
}

.card,
.contact-card {
  padding: clamp(24px, 4.5vw, 42px);
  border-radius: var(--radius-card);
}

.card[id] {
  scroll-margin-top: 24px;
}

.card > :last-child,
.contact-card > :last-child {
  margin-bottom: 0;
}

.section-kicker {
  margin: 0 0 8px;
  color: var(--mint);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

p {
  margin: 0 0 16px;
}

.muted,
.card p,
.card li,
.contact-card p,
.contact-card li {
  color: #c3cdce;
}

ul,
ol {
  margin: 14px 0 0;
  padding-left: 1.3em;
}

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

li::marker {
  color: var(--mint);
}

.data-list {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.data-list li {
  display: grid;
  grid-template-columns: minmax(112px, 0.32fr) minmax(0, 1fr);
  gap: 20px;
  margin: 0;
  padding: 18px 0;
  border-top: 1px solid var(--stroke-soft);
}

.data-list strong {
  color: var(--text);
}

.data-list span {
  color: #bdc8ca;
}

.callout {
  margin: 22px 0 0;
  padding: 18px 20px;
  border: 1px solid rgba(91, 224, 183, 0.25);
  border-left: 4px solid var(--mint);
  border-radius: 14px;
  background: rgba(91, 224, 183, 0.07);
  color: #d9e7e3;
}

.callout.warning {
  border-color: rgba(246, 180, 95, 0.25);
  border-left-color: var(--amber);
  background: rgba(246, 180, 95, 0.07);
}

.callout.danger {
  border-color: rgba(255, 107, 107, 0.23);
  border-left-color: var(--danger);
  background: rgba(255, 107, 107, 0.065);
}

.callout strong {
  color: var(--text);
}

.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.split-panel {
  padding: 20px;
  border: 1px solid var(--stroke-soft);
  border-radius: 16px;
  background: var(--surface-elevated);
}

.split-panel h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.split-panel p,
.split-panel ul {
  margin-bottom: 0;
  font-size: 15px;
}

.steps {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  counter-reset: steps;
  list-style: none;
}

.steps li {
  position: relative;
  min-height: 48px;
  margin: 0;
  padding: 4px 0 0 58px;
  counter-increment: steps;
}

.steps li::before {
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(91, 224, 183, 0.3);
  border-radius: 13px;
  background: rgba(91, 224, 183, 0.09);
  color: var(--mint);
  content: counter(steps);
  font-weight: 800;
}

.quick-card {
  display: block;
  min-height: 190px;
  padding: 24px;
  border-radius: var(--radius-card);
  color: inherit;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.quick-card:hover {
  transform: translateY(-2px);
  border-color: rgba(91, 224, 183, 0.35);
  background: var(--surface-elevated);
  color: inherit;
}

.quick-icon {
  width: 46px;
  height: 46px;
  margin-bottom: 22px;
  border-radius: 15px;
  font-size: 16px;
}

.quick-card h2 {
  margin-bottom: 8px;
  font-size: 20px;
}

.quick-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.section-heading {
  margin: 56px 0 20px;
}

.section-heading p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
}

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

details {
  border: 1px solid var(--stroke-soft);
  border-radius: 16px;
  background: var(--surface);
}

details[open] {
  border-color: rgba(91, 224, 183, 0.25);
  background: var(--surface-elevated);
}

summary {
  position: relative;
  min-height: 60px;
  padding: 17px 54px 17px 20px;
  color: var(--text);
  font-weight: 720;
  cursor: pointer;
  list-style: none;
}

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

summary::after {
  position: absolute;
  top: 50%;
  right: 20px;
  color: var(--mint);
  content: "+";
  font-size: 24px;
  line-height: 1;
  transform: translateY(-50%);
}

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

.details-body {
  padding: 0 20px 20px;
  color: #c3cdce;
}

.details-body > :last-child {
  margin-bottom: 0;
}

.contact-email {
  display: inline-block;
  margin: 6px 0 18px;
  color: var(--mint);
  font-size: clamp(21px, 4vw, 30px);
  font-weight: 750;
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}

.contact-aside {
  padding: 24px;
  border: 1px solid rgba(246, 180, 95, 0.22);
  border-radius: var(--radius-card);
  background: rgba(246, 180, 95, 0.055);
}

.contact-aside h3 {
  color: var(--amber);
}

.contact-aside p,
.contact-aside li {
  color: #cbd1ce;
  font-size: 15px;
}

.site-footer {
  margin-top: 64px;
  padding: 28px 0 42px;
  border-top: 1px solid var(--stroke-soft);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-copy {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-links a {
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
}

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

@media (max-width: 860px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 4px 16px;
  }

  .toc-title {
    width: 100%;
  }

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

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .shell {
    width: min(calc(100% - 24px), var(--page));
  }

  .site-header {
    padding-top: 12px;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .nav-links {
    width: 100%;
  }

  .nav-links a {
    flex: 1;
    justify-content: center;
  }

  .hero {
    margin-top: 16px;
    padding: 36px 22px;
  }

  h1 {
    font-size: 39px;
  }

  .quick-grid,
  .split,
  .data-list li {
    grid-template-columns: 1fr;
  }

  .data-list li {
    gap: 6px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

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

  .quick-card {
    transition: none;
  }
}

@media print {
  :root {
    color-scheme: light;
  }

  body {
    background: #fff;
    color: #111;
  }

  .site-header,
  .toc,
  .hero::before,
  .hero::after,
  .site-footer {
    display: none;
  }

  .hero,
  .card,
  .mini-card,
  .split-panel {
    border-color: #d8d8d8;
    background: #fff;
    box-shadow: none;
    color: #111;
  }

  .hero {
    padding: 24px 0;
  }

  h1,
  h2,
  h3,
  .card p,
  .card li,
  .data-list strong,
  .data-list span,
  .hero-lead {
    color: #111;
  }

  .content-layout {
    display: block;
  }

  .card {
    break-inside: avoid;
  }
}