:root {
  /* 与 App AppColors 对齐：#0F172A / #1E293B / #F59E0B / #10B981 */
  --ink: #0f172a;
  --mute: #64748b;
  --line: #e2e8f0;
  --paper: #ffffff;
  --page: #f1f5f9;
  --accent: #f59e0b;
  --accent-ink: #b45309;
  --accent-hover: #d97706;
  --accent-soft: #fffbeb;
  --ok: #10b981;
  --ok-soft: #ecfdf5;
  --max: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--page);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a {
  color: var(--accent-ink);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 16px;
  top: 16px;
  z-index: 20;
  background: var(--paper);
  padding: 8px 12px;
}

.wrap {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  background: var(--paper);
  border-top: 3px solid var(--accent);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand {
  color: var(--ink);
  text-decoration: none;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: block;
  flex: 0 0 auto;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand strong {
  font-size: 18px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.brand-text span {
  font-size: 12px;
  color: var(--mute);
  white-space: nowrap;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 22px;
  font-size: 14px;
}

nav a {
  color: var(--ink);
}

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

.hero {
  padding: 64px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  margin: 0;
  font-size: 44px;
  line-height: 1.15;
  letter-spacing: 0.02em;
}

.hero-title {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.hero-logo {
  width: 72px;
  height: 72px;
  border-radius: 16px;
  flex: 0 0 auto;
}

.hero-title .en {
  margin: 8px 0 0;
  color: var(--mute);
  font-size: 18px;
}

.hero .lead {
  margin: 0 0 18px;
  font-size: 18px;
  max-width: 34em;
}

.hero p {
  margin: 0 0 14px;
  color: var(--mute);
  max-width: 38em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-block;
  padding: 10px 16px;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: var(--paper);
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
  background: var(--accent-soft);
}

.btn-solid {
  background: var(--accent);
  color: var(--ink);
  border-color: var(--accent);
}

.btn-solid:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--ink);
}

.sentence-card {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 28px 28px 22px;
}

.sentence-card .label {
  margin: 0 0 18px;
  color: var(--mute);
  font-size: 13px;
}

.sentence-en {
  margin: 0;
  font-family: Georgia, "Songti SC", "Noto Serif SC", serif;
  font-size: 28px;
  line-height: 1.45;
}

.sentence-en i {
  font-style: normal;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}

.ipa {
  margin: 14px 0 0;
  color: var(--mute);
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  letter-spacing: 0.02em;
}

.marks {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.mark {
  border: 1px solid var(--accent);
  padding: 4px 8px;
  font-size: 13px;
  background: var(--accent-soft);
  color: var(--ink);
}

.section {
  padding: 28px 0 56px;
}

.section h2 {
  margin: 0 0 8px;
  font-size: 28px;
}

.section .intro {
  margin: 0 0 28px;
  color: var(--mute);
  max-width: 42em;
}

.section .intro.follow {
  margin: 22px 0 0;
}

.feature-rows {
  display: grid;
  gap: 0;
  background: var(--paper);
  border: 1px solid var(--line);
}

.feature-rows article {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 22px 24px;
  border-top: 1px solid var(--line);
}

.feature-rows article:first-child {
  border-top: 0;
}

.feature-rows h3 {
  margin: 0;
  font-size: 16px;
}

.feature-rows p {
  margin: 0;
  color: var(--mute);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.steps.follow {
  margin-top: 18px;
}

.steps article {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 22px 22px 20px;
}

.steps b {
  display: block;
  color: var(--accent-ink);
  font-size: 13px;
  margin-bottom: 8px;
}

.steps h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.steps p {
  margin: 0;
  color: var(--mute);
}

.shots {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.shot {
  margin: 0;
}

.shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--ink);
}

.shot figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--mute);
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 22px;
}

.panel h3 {
  margin: 0 0 10px;
}

.panel p,
.panel li {
  color: var(--mute);
}

.panel ul {
  margin: 0;
  padding-left: 1.1em;
}

.promise {
  background: var(--paper);
  border-left: 4px solid var(--ok);
  padding: 22px 24px;
}

.promise p {
  margin: 0 0 10px;
}

.promise p:last-child {
  margin-bottom: 0;
  color: var(--mute);
}

.company {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 28px;
}

.company h2 {
  margin-top: 0;
}

.company dl {
  margin: 0;
}

.company dt {
  font-size: 13px;
  color: var(--mute);
}

.company dd {
  margin: 0 0 14px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper);
  padding: 28px 0 36px;
  color: var(--mute);
  font-size: 13px;
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.site-footer a {
  color: var(--mute);
}

.legal-page {
  padding: 40px 0 72px;
}

.legal-page h1 {
  margin: 0 0 8px;
  font-size: 32px;
}

.legal-meta {
  color: var(--mute);
  margin: 0 0 28px;
}

.legal-body {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 32px 36px 40px;
}

.legal-body h2 {
  margin: 32px 0 12px;
  font-size: 20px;
}

.legal-body h3 {
  margin: 24px 0 10px;
  font-size: 17px;
}

.legal-body p,
.legal-body li {
  color: var(--ink);
}

.legal-body blockquote {
  margin: 16px 0;
  padding: 12px 16px;
  border-left: 4px solid var(--ok);
  background: var(--ok-soft);
}

.legal-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 20px;
  font-size: 14px;
}

.legal-body th,
.legal-body td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

.legal-body th {
  background: var(--page);
}

@media (max-width: 900px) {
  .hero-grid,
  .company,
  .two-col,
  .steps,
  .shots,
  .feature-rows article {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 34px;
  }

  .wrap {
    width: min(var(--max), calc(100% - 32px));
  }

  .legal-body {
    padding: 22px 18px 28px;
  }
}

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