:root {
  --bg: #f6f4ef;
  --paper: #fffefa;
  --ink: #17212b;
  --muted: #556575;
  --line: #ddd7cc;
  --soft-line: #ece7dc;
  --blue: #1479f6;
  --blue-soft: #eef6ff;
  --red: #e43d30;
  --red-soft: #fff3ef;
  --green: #0f8f70;
  --code-bg: #14212c;
  --shadow: 0 18px 48px rgba(37, 33, 24, .1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(23, 33, 43, .045) 1px, transparent 1px),
    linear-gradient(0deg, rgba(23, 33, 43, .045) 1px, transparent 1px),
    var(--bg);
  background-size: 32px 32px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
  overflow-x: hidden;
}

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

p,
li {
  color: var(--muted);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(38px, 5.2vw, 68px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin: 26px 0 8px;
  font-size: 21px;
  line-height: 1.28;
}

code {
  display: inline-block;
  max-width: 100%;
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(20, 33, 44, .08);
  color: #102132;
  font-family: Consolas, "SFMono-Regular", "Liberation Mono", monospace;
  font-size: .92em;
  line-height: 1.5;
  overflow-x: auto;
  white-space: nowrap;
  vertical-align: -.12em;
}

pre {
  max-width: 100%;
  margin: 14px 0 20px;
  padding: 18px 20px;
  overflow-x: auto;
  border-radius: 8px;
  background: var(--code-bg);
  color: #e8fff3;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .06);
}

pre code {
  display: block;
  padding: 0;
  overflow: visible;
  background: transparent;
  color: inherit;
  font-size: 14px;
  line-height: 1.72;
  white-space: pre;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px clamp(18px, 5vw, 72px);
  border-bottom: 1px solid rgba(221, 215, 204, .9);
  background: rgba(246, 244, 239, .92);
  backdrop-filter: blur(14px);
}

.brand,
.nav {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-size: 18px;
  font-weight: 850;
}

.brand-mark {
  display: inline-flex;
  width: 38px;
  height: 32px;
  align-items: center;
  justify-content: center;
}

.brand-mark svg {
  width: 38px;
  height: 38px;
  overflow: visible;
}

.fish-body {
  fill: var(--blue);
}

.fish-tail,
.fish-fin {
  fill: #76c7ff;
}

.fish-eye {
  fill: #0e2338;
}

.nav {
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
}

.nav a {
  padding: 8px 12px;
  border-radius: 8px;
}

.nav a:hover,
.nav a:focus-visible,
.nav a.active {
  background: var(--paper);
  color: var(--ink);
  outline: 1px solid var(--line);
}

.home-wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(42px, 7vw, 92px) clamp(18px, 5vw, 48px) 72px;
}

.home-title {
  max-width: 860px;
  margin-bottom: 30px;
}

.home-title p:not(.eyebrow) {
  max-width: 760px;
  font-size: clamp(17px, 2vw, 21px);
}

.eyebrow {
  margin-bottom: 10px;
  color: var(--green);
  font-size: 13px;
  font-weight: 850;
}

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

.route-card,
.plain-note,
.doc-hero,
.doc-section,
.toc {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 254, 250, .95);
  box-shadow: var(--shadow);
}

.route-card {
  padding: clamp(24px, 4vw, 34px);
}

.route-card h2 {
  font-size: clamp(28px, 3.4vw, 42px);
}

.route-card ol {
  margin: 18px 0 24px;
  padding-left: 1.25em;
}

.route-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  color: var(--muted);
  font-weight: 800;
}

.route-badge {
  display: inline-flex;
  min-width: 42px;
  height: 30px;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  color: #fff;
  font-size: 13px;
  font-weight: 900;
}

.route-badge.rn {
  background: var(--blue);
}

.route-badge.flutter {
  background: var(--red);
}

.rn-card,
.rn-hero {
  background: linear-gradient(180deg, var(--paper), var(--blue-soft));
}

.flutter-card,
.flutter-hero {
  background: linear-gradient(180deg, var(--paper), var(--red-soft));
}

.card-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font-weight: 850;
}

.plain-note {
  margin-top: 18px;
  padding: 26px;
  box-shadow: none;
}

.plain-note h2 {
  font-size: 26px;
}

.doc-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 28px;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 34px clamp(18px, 4vw, 44px) 72px;
}

.toc {
  position: sticky;
  top: 88px;
  align-self: start;
  display: grid;
  gap: 4px;
  padding: 16px;
  box-shadow: none;
}

.toc strong {
  margin-bottom: 8px;
}

.toc a {
  padding: 7px 8px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
}

.toc a:hover,
.toc a:focus-visible {
  background: var(--soft-line);
  color: var(--ink);
  outline: none;
}

.doc {
  min-width: 0;
}

.doc-hero {
  margin-bottom: 18px;
  padding: clamp(28px, 5vw, 48px);
  overflow: hidden;
}

.doc-hero h1 {
  max-width: 900px;
  overflow-wrap: anywhere;
}

.doc-hero p:last-child {
  max-width: 850px;
  font-size: 18px;
}

.doc-section {
  margin-top: 18px;
  padding: clamp(24px, 4vw, 40px);
  overflow: hidden;
}

.result-box {
  padding: 20px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  background: #f7fbf8;
}

.result-box ul {
  margin-bottom: 0;
}

.checklist {
  display: grid;
  gap: 10px;
  margin: 18px 0;
}

.checklist label {
  position: relative;
  display: block;
  min-width: 0;
  padding: 12px 14px 12px 42px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
}

.checklist input {
  position: absolute;
  top: 17px;
  left: 14px;
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--green);
}

.checklist span {
  display: block;
  min-width: 0;
}

.field-list {
  display: grid;
  gap: 10px;
  margin: 16px 0 20px;
}

.field-list > div {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 14px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  background: #fff;
}

.field-list span {
  color: var(--muted);
  font-weight: 800;
}

.steps-list {
  margin: 18px 0;
  padding-left: 1.3em;
}

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

.trouble-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.trouble-grid article {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  background: #fff;
}

.trouble-grid h3 {
  margin-top: 0;
}

.doc-section a {
  color: #135aa7;
  border-bottom: 1px solid currentColor;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(18px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer a {
  color: var(--ink);
  font-weight: 850;
}

@media (max-width: 980px) {
  .route-grid,
  .doc-layout,
  .trouble-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .toc strong {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .topbar,
  .footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .home-wrap {
    padding-inline: 14px;
  }

  .doc-layout {
    display: block;
    padding: 12px 14px 54px;
    max-width: 100vw;
    overflow-x: hidden;
  }

  .toc,
  .doc-hero,
  .doc-section {
    width: 100%;
    max-width: calc(100vw - 28px);
  }

  .doc-hero,
  .doc-section,
  .route-card,
  .plain-note {
    padding: 20px;
  }

  .doc-hero {
    overflow: visible;
  }

  .doc-hero > *,
  .doc-section > *,
  .result-box > *,
  .trouble-grid > *,
  .checklist > *,
  .field-list > * {
    max-width: 100%;
  }

  h1 {
    font-size: 30px;
    line-height: 1.14;
    overflow-wrap: anywhere;
    word-break: break-all;
  }

  .doc-hero h1,
  .doc-hero p,
  .doc-section p,
  .doc-section li {
    width: 100%;
    max-width: 100%;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .doc-hero h1 {
    word-break: break-all;
  }

  h2 {
    font-size: 28px;
  }

  .field-list > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  p,
  li,
  .checklist span {
    overflow-wrap: anywhere;
  }

  p code,
  li code,
  .checklist code,
  .field-list code {
    max-width: 100%;
    white-space: normal;
    word-break: break-word;
  }

  pre {
    margin-left: -4px;
    margin-right: -4px;
    padding: 15px;
  }
}

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