:root {
  --blue: #4f91a6;
  --blue-dark: #3a7486;
  --blue-pale: #c5ebf3;
  --text: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --bg: #f6f6f6;
  --bg-card: #ffffff;
  --border: #e5e7eb;
  --radius: 16px;
  --shadow: 0 8px 24px rgba(79, 145, 166, 0.08);
}

* {
  box-sizing: border-box;
}

body.legal-page-body {
  margin: 0;
  font-family: "Source Sans Pro", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--blue-pale) 0%, var(--bg) 280px);
  min-height: 100vh;
}

.container {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--blue);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
}

.nav-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-toggle-btn {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0;
  border: 0;
  background: transparent;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  appearance: none;
  -webkit-appearance: none;
}

.nav-toggle-btn:active {
  background: #eef8fb;
}

.nav-toggle-btn span,
.nav-toggle-btn span::before,
.nav-toggle-btn span::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--blue-dark);
  border-radius: 2px;
  position: relative;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle-btn span::before,
.nav-toggle-btn span::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-btn span::before {
  top: -6px;
}

.nav-toggle-btn span::after {
  top: 6px;
}

html.nav-open .nav-toggle-btn span {
  background: transparent;
}

html.nav-open .nav-toggle-btn span::before {
  top: 0;
  transform: rotate(45deg);
}

html.nav-open .nav-toggle-btn span::after {
  top: 0;
  transform: rotate(-45deg);
}

.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 20px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a[data-lang-toggle] {
  color: var(--blue-dark);
  font-weight: 600;
}

.nav-links a.is-active {
  color: var(--blue-dark);
  font-weight: 700;
}

.faq-lead {
  margin: 0 0 10px;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 40rem;
}

.faq-category + .faq-category {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.faq-category-title {
  margin: 0 0 14px;
  font-size: 1.125rem;
  font-weight: 700;
  color: #2a6f82;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fafcfd;
  overflow: hidden;
}

.faq-item[open] {
  background: #fff;
  border-color: #9ec9d6;
  box-shadow: 0 4px 14px rgba(79, 145, 166, 0.08);
}

.faq-question {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--text);
  font-size: 0.975rem;
  line-height: 1.55;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-item > summary {
  list-style: none;
}

.faq-question-text {
  flex: 1;
}

.faq-chevron {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--blue);
  border-bottom: 2px solid var(--blue);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
  margin-top: 8px;
}

.faq-item[open] .faq-chevron {
  transform: rotate(-135deg);
  margin-top: 2px;
}

.faq-answer {
  padding: 0 16px 16px;
}

.faq-answer-p {
  margin: 0 0 8px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.faq-answer-p:last-child {
  margin-bottom: 0;
}

.legal-main {
  padding: 48px 0 64px;
  min-height: calc(100vh - 180px);
}

.legal-header {
  margin-bottom: 28px;
}

.legal-title {
  margin: 0 0 10px;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
}

.legal-updated {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.legal-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 28px;
}

.legal-section + .legal-section {
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.legal-section--featured {
  margin-top: 24px;
  padding: 20px 18px !important;
  border: 1px solid #9ec9d6 !important;
  border-radius: 14px;
  background: linear-gradient(145deg, #eef8fb 0%, #fff9f1 100%);
  box-shadow: 0 6px 18px rgba(79, 145, 166, 0.1);
}

.legal-section + .legal-section--featured {
  border-top: 1px solid #9ec9d6 !important;
  padding-top: 20px !important;
}

.legal-section--featured + .legal-section {
  border-top: none;
  padding-top: 8px;
}

.legal-section-badge {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  background: linear-gradient(135deg, #f5a623, #e67e22);
}

.legal-section--featured .legal-section-title {
  color: #2a6f82;
}

.legal-section-title {
  margin: 0 0 12px;
  font-size: 1.125rem;
  font-weight: 700;
}

.legal-paragraph {
  margin: 0 0 10px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.legal-paragraph:last-child {
  margin-bottom: 0;
}

.legal-paragraph a,
.legal-link {
  color: var(--blue-dark);
  word-break: break-all;
}

.legal-footer-note {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer {
  border-top: 1px solid var(--border);
  background: #fff;
  padding: 28px 0 36px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 10px;
}

.footer-brand img {
  width: 28px;
  height: 28px;
  border-radius: 8px;
}

.footer-desc,
.footer-col p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-col h4 {
  margin: 0 0 12px;
  font-size: 0.95rem;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.9;
}

.footer-col a:hover {
  color: var(--blue-dark);
}

.footer-bottom {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.changelog-table-wrap {
  margin-top: 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.changelog-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.changelog-table th,
.changelog-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  color: var(--text-secondary);
}

.changelog-table th {
  color: var(--text);
  font-weight: 700;
  background: #f3fafc;
}

.changelog-table tr:last-child td {
  border-bottom: none;
}

.changelog-table tr:hover td {
  background: #fafcfd;
}

.changelog-table a {
  color: var(--blue-dark);
}

html.in-app .nav {
  display: none !important;
}

html.is-compact .nav {
  padding-top: env(safe-area-inset-top, 0);
}

html.is-compact .nav-inner {
  flex-wrap: wrap;
  min-height: 56px;
  gap: 0;
  padding: 0;
}

html.is-compact .nav-brand {
  font-size: 1.125rem;
}

html.is-compact .nav-toggle-btn {
  display: flex;
}

html.is-compact .nav-links {
  display: none;
  flex-basis: 100%;
  flex-direction: column;
  flex-wrap: nowrap;
  gap: 0;
  padding: 4px 0 12px;
  border-top: 1px solid var(--border);
}

html.is-compact.nav-open .nav-links {
  display: flex;
}

html.is-compact .nav-links li + li {
  border-top: 1px solid #f0f3f4;
}

html.is-compact .nav-links a {
  display: block;
  padding: 13px 4px;
  font-size: 0.9375rem;
  line-height: 1.4;
}

html.in-app .container,
html.is-compact .container {
  width: min(920px, calc(100% - 24px));
}

html.in-app .legal-main {
  padding: 16px 0 32px;
}

html.is-compact:not(.in-app) .legal-main {
  padding: 24px 0 40px;
}

html.in-app .legal-header,
html.is-compact .legal-header {
  margin-bottom: 18px;
}

html.in-app .legal-title,
html.is-compact .legal-title {
  font-size: 1.5rem;
}

html.in-app .faq-lead,
html.is-compact .faq-lead {
  font-size: 0.9375rem;
  line-height: 1.65;
}

html.in-app .legal-content,
html.is-compact .legal-content {
  padding: 16px 12px;
  border-radius: 14px;
}

html.in-app .faq-category + .faq-category,
html.is-compact .faq-category + .faq-category {
  margin-top: 24px;
  padding-top: 20px;
}

html.in-app .faq-category-title,
html.is-compact .faq-category-title {
  margin-bottom: 12px;
  font-size: 1.0625rem;
}

html.in-app .faq-list,
html.is-compact .faq-list {
  gap: 8px;
}

html.in-app .faq-question,
html.is-compact .faq-question {
  padding: 15px 14px;
  font-size: 0.9375rem;
  gap: 14px;
}

html.in-app .faq-answer,
html.is-compact .faq-answer {
  padding: 0 14px 14px;
}

html.in-app .faq-answer-p,
html.is-compact .faq-answer-p {
  font-size: 0.9rem;
  line-height: 1.75;
}

html.in-app .legal-footer-note,
html.is-compact .legal-footer-note {
  line-height: 1.7;
  word-break: break-word;
}

html.in-app .footer,
html.is-compact .footer {
  padding: 24px 0 calc(28px + env(safe-area-inset-bottom, 0));
}

html.in-app .footer-grid,
html.is-compact .footer-grid {
  grid-template-columns: 1fr;
}

html.in-app .footer-bottom,
html.is-compact .footer-bottom {
  flex-direction: column;
  gap: 6px;
}

@media (max-width: 900px) {
  html:not(.is-compact) .container {
    width: min(920px, calc(100% - 24px));
  }

  html:not(.is-compact) .nav-inner {
    flex-wrap: wrap;
    min-height: 56px;
    gap: 0;
    padding: 0;
  }

  html:not(.is-compact) .nav-toggle-btn {
    display: flex;
  }

  html:not(.is-compact) .nav-links {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    padding: 4px 0 12px;
    border-top: 1px solid var(--border);
  }

  html:not(.is-compact).nav-open .nav-links,
  html:not(.is-compact) .nav-open .nav-links {
    display: flex;
  }

  html:not(.is-compact) .legal-content {
    padding: 16px 12px;
  }
}