:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --surface-muted: #f2efe9;
  --text: #1e1c1a;
  --text-soft: #5e584f;
  --border: #d8d2c6;
  --accent: #2e2a24;
  --focus: #7a6342;
  --rating-star: #7a4a00;
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --max-width: 1080px;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12100e;
    --surface: #1b1916;
    --surface-muted: #23201c;
    --text: #f8f5ef;
    --text-soft: #c7beb0;
    --border: #3c352c;
    --accent: #f8f5ef;
    --focus: #cfb88f;
    --rating-star: #f0c163;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.lang-fade {
  transition: opacity 140ms var(--ease-out-quart);
}

body.lang-switching .lang-fade {
  opacity: 0;
}

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.site-shell {
  width: min(100% - 2.5rem, var(--max-width));
  margin: 0 auto;
}

.topbar {
  padding: var(--space-4) 0 var(--space-2);
}

.topbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.brand-mark {
  font-size: 1rem;
  color: var(--text-soft);
  letter-spacing: 0.02em;
}

.language-switch {
  display: inline-flex;
  gap: 0.2rem;
  border: 0;
  border-radius: 999px;
  padding: 0;
  background: transparent;
}

.lang-btn {
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-soft);
  border-radius: 999px;
  padding: 0.35rem 0.68rem;
  min-width: 44px;
  min-height: 44px;
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  opacity: 0.85;
}

.lang-btn.is-active {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
  opacity: 1;
}

.hero {
  min-height: calc(100vh - 88px);
  min-height: calc(100svh - 88px);
  display: grid;
  align-content: center;
  padding: var(--space-6) 0 var(--space-7);
}

.hero-inner {
  text-align: center;
  display: grid;
  gap: var(--space-4);
}

.logo-wrap {
  margin: 0 auto;
  width: clamp(180px, 24vw, 260px);
}

.logo-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

.brand-cn {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: 0.08em;
}

.brand-en {
  margin: 0;
  font-size: clamp(1rem, 2.3vw, 1.4rem);
  color: var(--text-soft);
  font-weight: 500;
}

.slogan {
  margin: 0;
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
}

.primary-cta {
  justify-self: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--bg);
  text-decoration: none;
  border-radius: 999px;
  font-weight: 600;
  padding: 0.8rem 1.35rem;
  min-width: clamp(180px, 52vw, 235px);
}

.primary-cta svg {
  width: 18px;
  height: 18px;
}

.subnote {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.94rem;
}

.section {
  padding: 0 0 var(--space-7);
}

.section h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2.2vw, 1.85rem);
}

.section-intro {
  margin: var(--space-2) 0 0;
  color: var(--text-soft);
  max-width: 72ch;
}

.feature-list {
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-3);
}

.feature-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  min-width: 0;
}

.feature-item h3 {
  margin: 0;
  font-size: 1.08rem;
}

.feature-item p {
  margin: var(--space-1) 0 0;
  color: var(--text-soft);
}

.review-status {
  margin: var(--space-2) 0 0;
  color: var(--text-soft);
  min-height: 1.2em;
}

.review-grid {
  margin-top: var(--space-4);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.review-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  min-width: 0;
}

.review-stars {
  margin: 0;
  letter-spacing: 0.08em;
  color: var(--rating-star);
}

.review-title {
  margin: var(--space-2) 0 0;
  font-size: 1.02rem;
}

.review-body {
  margin: var(--space-2) 0 0;
  color: var(--text-soft);
  overflow-wrap: anywhere;
}

.review-meta {
  margin: var(--space-2) 0 0;
  color: var(--text-soft);
  font-size: 0.86rem;
}

.legal-note {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-muted);
}

.legal-note p {
  margin: 0;
}

.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-4) 0 var(--space-6);
  color: var(--text-soft);
  font-size: 0.94rem;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.footer-links {
  display: inline-flex;
  gap: var(--space-3);
}

.footer-links a {
  text-underline-offset: 0.2rem;
}

.footer-meta {
  width: 100%;
  margin: var(--space-1) 0 0;
  font-size: 0.88rem;
}

.footer-meta a {
  color: inherit;
  text-underline-offset: 0.2rem;
}

.doc {
  padding: var(--space-6) 0 var(--space-7);
}

.doc h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3.3vw, 2.3rem);
}

.doc-meta {
  margin-top: var(--space-2);
  color: var(--text-soft);
  font-size: 0.94rem;
}

.doc section {
  margin-top: var(--space-5);
}

.doc h2 {
  margin: 0;
  font-size: 1.12rem;
}

.doc p,
.doc li {
  margin: var(--space-2) 0 0;
}

.doc ul {
  padding-left: 1.2rem;
}

.notice {
  margin-top: var(--space-3);
  padding: var(--space-3);
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-muted);
}

.hidden {
  display: none !important;
}

@media (max-width: 720px) {
  .site-shell {
    width: min(100% - 1.5rem, var(--max-width));
  }

  .hero {
    min-height: calc(100vh - 74px);
    min-height: calc(100svh - 74px);
  }

  .primary-cta {
    min-width: 0;
    width: min(100%, 280px);
  }

  .footer-links {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

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

@media (min-width: 900px) {
  .feature-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1024px) and (min-width: 721px) {
  .review-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .lang-fade {
    transition: none;
  }

  body.lang-switching .lang-fade {
    opacity: 1;
  }
}