:root {
  color-scheme: light;
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-muted: #eef3f9;
  --text: #172033;
  --text-muted: #596579;
  --line: #d9e1eb;
  --line-strong: #b9c6d5;
  --accent: #1769aa;
  --accent-strong: #0f578f;
  --accent-soft: #e3f0fa;
  --code-bg: #101827;
  --code-text: #e8eef8;
  --success-soft: #e8f5ee;
  --success-text: #17633b;
  --danger-soft: #f9eded;
  --danger-text: #8a2c2c;
  --shadow: 0 18px 50px rgb(36 63 94 / 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0c111b;
    --surface: #121a27;
    --surface-muted: #182333;
    --text: #edf2f8;
    --text-muted: #a7b3c4;
    --line: #29374a;
    --line-strong: #41536a;
    --accent: #72b7ee;
    --accent-strong: #9acbf1;
    --accent-soft: #172f44;
    --code-bg: #080c13;
    --code-text: #e8eef8;
    --success-soft: #143326;
    --success-text: #8ddab1;
    --danger-soft: #3a2024;
    --danger-text: #f0a6aa;
    --shadow: 0 18px 50px rgb(0 0 0 / 0.24);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

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

a:hover {
  color: var(--accent-strong);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

code,
pre {
  font-family: var(--font-mono);
}

code {
  overflow-wrap: anywhere;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1440px, 100%);
  min-height: 68px;
  margin: 0 auto;
  padding: 0 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--text);
  text-decoration: none;
}

.brand:hover {
  color: var(--text);
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 10px;
  background: var(--accent);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.25;
}

.brand strong {
  font-size: 15px;
  letter-spacing: -0.01em;
}

.brand small {
  margin-top: 2px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.header-links {
  display: flex;
  align-items: center;
  gap: 24px;
  white-space: nowrap;
}

.header-links a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

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

.page-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 880px);
  gap: 64px;
  width: min(1240px, 100%);
  margin: 0 auto;
  padding: 46px 28px 96px;
}

.sidebar {
  align-self: start;
  position: sticky;
  top: 100px;
}

.sidebar nav {
  display: grid;
  gap: 3px;
}

.sidebar a {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 14px;
  text-decoration: none;
}

.sidebar a:hover {
  background: var(--surface-muted);
  color: var(--text);
}

.nav-group {
  margin: 24px 10px 6px;
  color: var(--text);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.02em;
}

.nav-group:first-child {
  margin-top: 0;
}

.content {
  min-width: 0;
}

.hero {
  padding: 28px 0 48px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 750;
  letter-spacing: -0.055em;
  line-height: 1.07;
}

.hero-copy {
  max-width: 680px;
  margin: 22px 0 0;
  color: var(--text-muted);
  font-size: 19px;
  line-height: 1.65;
}

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

.primary-action,
.secondary-action {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 120ms ease, background-color 120ms ease;
}

.primary-action {
  background: var(--accent);
  color: #ffffff;
}

.primary-action:hover {
  background: var(--accent-strong);
  color: #ffffff;
}

.secondary-action {
  background: transparent;
  color: var(--accent);
}

.primary-action:active,
.secondary-action:active {
  transform: translateY(1px);
}

.service-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  margin: 40px 0 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--line);
}

.service-facts li {
  display: grid;
  min-width: 0;
  padding: 16px;
  background: var(--surface);
  list-style: none;
}

.fact-label {
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 700;
}

.fact-value {
  margin-top: 5px;
  font-size: 14px;
}

.notice {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
  margin: 32px 0 6px;
  padding: 22px 24px;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--line));
  border-radius: var(--radius-md);
  background: var(--accent-soft);
}

.notice h2 {
  margin: 0;
  font-size: 18px;
}

.notice p {
  margin: 5px 0 0;
  color: var(--text-muted);
}

.notice a {
  font-weight: 700;
  white-space: nowrap;
}

.doc-section {
  padding: 64px 0 14px;
}

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

.doc-section h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 38px);
  letter-spacing: -0.035em;
  line-height: 1.2;
}

.doc-section h3 {
  margin: 30px 0 10px;
  font-size: 19px;
  letter-spacing: -0.018em;
}

.doc-section > p {
  max-width: 72ch;
  margin: 14px 0 0;
  color: var(--text-muted);
}

.flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  margin-top: 30px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.flow-node {
  display: grid;
  min-height: 92px;
  align-content: center;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-muted);
}

.flow-node strong {
  font-size: 14px;
}

.flow-node span {
  color: var(--text-muted);
  font-size: 12px;
}

.accent-node {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.flow-arrow {
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
}

.step-list {
  display: grid;
  gap: 0;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.step-list li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 18px;
  padding: 20px 0;
}

.step-list li + li {
  border-top: 1px solid var(--line);
}

.step-list > li > span {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.step-list strong {
  display: block;
}

.step-list p {
  margin: 4px 0 0;
  color: var(--text-muted);
}

.requirements-grid,
.error-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 32px;
  margin-top: 28px;
}

.requirements-grid article,
.error-grid article {
  padding-top: 16px;
  border-top: 2px solid var(--line);
}

.requirements-grid h3 {
  margin: 0;
  font-size: 16px;
}

.requirements-grid p,
.error-grid p {
  margin: 6px 0 0;
  color: var(--text-muted);
}

.callout {
  max-width: none !important;
  margin-top: 26px !important;
  padding: 18px 20px;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--surface-muted);
}

.code-block {
  overflow: hidden;
  margin-top: 28px;
  border: 1px solid #29354a;
  border-radius: var(--radius-md);
  background: var(--code-bg);
  color: var(--code-text);
  box-shadow: var(--shadow);
}

.code-title {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 10px 16px;
  border-bottom: 1px solid #29354a;
  color: #adbad0;
  font-family: var(--font-mono);
  font-size: 12px;
}

pre {
  margin: 0;
  overflow-x: auto;
  padding: 20px;
  font-size: 13px;
  line-height: 1.65;
  tab-size: 2;
}

.sample-note {
  font-size: 13px;
}

.table-wrap {
  overflow-x: auto;
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  text-align: left;
}

th,
td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 750;
}

td {
  font-size: 14px;
}

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

.success-row {
  background: var(--success-soft);
  color: var(--success-text);
}

.header-list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.header-list li {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) 1fr;
  gap: 22px;
  padding: 14px 0;
}

.header-list li + li {
  border-top: 1px solid var(--line);
}

.header-list li > code {
  font-weight: 700;
}

.header-list li > span {
  color: var(--text-muted);
}

.formula {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 18px;
  margin-top: 24px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.formula span {
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 700;
}

.endpoint-list {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.endpoint-list article {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.endpoint-list code {
  color: var(--accent);
  font-weight: 700;
}

.endpoint-list p {
  margin: 7px 0 0;
  color: var(--text-muted);
}

.error-grid article > code {
  color: var(--accent);
  font-size: 15px;
  font-weight: 700;
}

.policy-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.policy-columns article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.policy-columns h3 {
  margin: 0;
}

.policy-columns p {
  margin: 9px 0 0;
  color: var(--text-muted);
}

.allowed {
  background: var(--success-soft);
}

.blocked {
  background: var(--danger-soft);
}

.security-list,
.checklist {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: security-item;
}

.security-list li,
.checklist li {
  position: relative;
  padding: 0 0 0 34px;
  color: var(--text-muted);
}

.security-list li::before,
.checklist li::before {
  position: absolute;
  top: 2px;
  left: 0;
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border: 1px solid var(--accent);
  border-radius: 50%;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}

.security-list li::before {
  content: "!";
}

.checklist li {
  counter-increment: security-item;
}

.checklist li::before {
  content: counter(security-item);
}

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

.ai-section {
  margin-top: 50px;
  padding: 42px;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--line));
  border-radius: var(--radius-lg);
  background: var(--accent-soft);
}

.ai-resources {
  display: grid;
  gap: 10px;
  margin-top: 26px;
}

.ai-resources a {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  padding: 14px 16px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
  border-radius: var(--radius-sm);
  background: var(--surface);
  text-decoration: none;
}

.ai-resources span {
  color: var(--text);
  font-weight: 700;
}

.prompt-block {
  overflow: hidden;
  margin-top: 22px;
  border-radius: var(--radius-md);
  background: var(--code-bg);
  color: var(--code-text);
}

.prompt-block p {
  margin: 0;
  padding: 10px 16px;
  border-bottom: 1px solid #29354a;
  color: #adbad0;
  font-size: 12px;
  font-weight: 700;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  width: min(1240px, 100%);
  margin: 0 auto;
  padding: 34px 28px 52px;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 14px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: start;
}

.site-footer a {
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

@media (max-width: 960px) {
  .page-shell {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .sidebar {
    display: none;
  }

  .flow {
    grid-template-columns: 1fr;
  }

  .flow-arrow {
    transform: rotate(90deg);
    justify-self: center;
  }
}

@media (max-width: 720px) {
  .header-inner,
  .page-shell,
  .site-footer {
    padding-left: 18px;
    padding-right: 18px;
  }

  .header-links {
    display: none;
  }

  .page-shell {
    padding-top: 20px;
    padding-bottom: 64px;
  }

  .hero {
    padding-top: 18px;
  }

  h1 {
    font-size: clamp(34px, 9.2vw, 40px);
    letter-spacing: -0.04em;
    line-height: 1.13;
  }

  .service-facts,
  .requirements-grid,
  .error-grid,
  .policy-columns {
    grid-template-columns: 1fr;
  }

  .notice,
  .header-list li,
  .formula,
  .ai-resources a {
    grid-template-columns: 1fr;
  }

  .notice {
    gap: 12px;
  }

  .doc-section {
    padding-top: 48px;
  }

  .ai-section {
    margin-left: -6px;
    margin-right: -6px;
    padding: 28px 20px;
  }

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

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

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

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--bg);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}