/* ==========================================================================
   AppReviewKit 官网样式表
   风格参考: https://extrastu.cn/ (极简主义、克制美学、自适应深浅色模式)
   ========================================================================== */

:root {
  --bg: #ffffff;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --border: #e5e7eb;
  --border-hover: #9ca3af;
  --accent: #0071e3;
  --card-bg: #f9fafb;
  --tag-bg: #f3f4f6;
  --max-width: 680px;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, "Courier New", monospace;
}

html.dark {
  --bg: #121212;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-tertiary: #6b7280;
  --border: #27272a;
  --border-hover: #52525b;
  --accent: #2997ff;
  --card-bg: #18181b;
  --tag-bg: #27272a;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.75;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
}

/* 容器布局 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}
@media (min-width: 640px) { .container { padding: 0 2rem; } }
@media (min-width: 768px) { .container { padding: 0 3rem; } }

/* 顶部导航 */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2.5rem 0 2rem;
  width: 100%;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  transition: opacity 0.15s ease;
}
.brand:hover { opacity: 0.8; }
.brand-icon {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  object-fit: cover;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.875rem;
}
.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}
.nav-link:hover, .nav-link.active { color: var(--text-primary); }

.site-main { flex: 1; }
p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

a.inline-link {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--border-hover);
  text-underline-offset: 4px;
  transition: text-decoration-color 0.15s ease, color 0.15s ease;
}
a.inline-link:hover {
  text-decoration-color: var(--text-primary);
  color: var(--text-primary);
}

/* Hero 区域 */
.hero-section { padding-bottom: 2.5rem; }
.hero-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}
.hero-app-icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.12);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}
.hero-app-icon:hover { transform: scale(1.03); }
.hero-title-group h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 0.25rem;
}
.hero-subtitle {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.4;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 1.25rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--tag-bg);
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  border: 1px solid var(--border);
}
.badge svg { width: 12px; height: 12px; color: var(--accent); }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
  align-items: center;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--text-primary);
  color: var(--bg);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.15s ease, transform 0.1s ease;
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.btn-secondary:hover {
  border-color: var(--border-hover);
  background-color: var(--tag-bg);
}

/* 分隔模块 */
.section {
  border-top: 1px solid var(--border);
  padding: 2rem 0 2.5rem;
}
.section-title {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

/* 特性与场景 */
.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.875rem;
  line-height: 1.6;
}
.feature-icon-wrapper {
  margin-top: 0.2rem;
  color: var(--accent);
  flex-shrink: 0;
}
.feature-item strong { color: var(--text-primary); font-weight: 600; }
.feature-item span { color: var(--text-secondary); }

.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-top: 1rem;
}
@media (min-width: 540px) {
  .scenarios-grid { grid-template-columns: 1fr 1fr; }
}
.scenario-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.875rem 1rem;
  background-color: var(--card-bg);
  transition: border-color 0.15s ease;
}
.scenario-card:hover { border-color: var(--border-hover); }
.scenario-badge {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.25rem;
  display: inline-block;
}
.scenario-card h3 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.scenario-card p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 0;
}

/* 5 步向导列表 */
.steps-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 0.75rem;
}
.step-item { display: flex; gap: 1rem; }
.step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-primary);
  background-color: var(--tag-bg);
  flex-shrink: 0;
  margin-top: 0.1rem;
}
.step-content { flex: 1; }
.step-title { font-size: 0.875rem; font-weight: 600; margin-bottom: 0.2rem; }
.step-desc { font-size: 0.8125rem; color: var(--text-secondary); line-height: 1.5; }

/* FAQ 折叠项 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.faq-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  background-color: var(--card-bg);
  overflow: hidden;
  transition: border-color 0.15s ease;
}
.faq-item:hover { border-color: var(--border-hover); }
.faq-summary {
  padding: 0.875rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}
.faq-summary::-webkit-details-marker { display: none; }
.faq-summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--text-secondary);
}
.faq-item[open] .faq-summary::after { content: "−"; }
.faq-answer {
  padding: 0 1rem 0.875rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 隐私政策专区 */
.privacy-article { padding-bottom: 2rem; }
.privacy-article h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}
.privacy-meta {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  margin-bottom: 2rem;
}
.privacy-section { margin-bottom: 2rem; }
.privacy-section h2 {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}
.privacy-section p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.7;
  margin-bottom: 0.75rem;
}
.privacy-section ul {
  list-style-type: disc;
  padding-left: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}
.privacy-section li { margin-bottom: 0.375rem; line-height: 1.6; }
.highlight-box {
  background-color: var(--card-bg);
  border-left: 3px solid var(--accent);
  padding: 0.875rem 1rem;
  border-radius: 0 8px 8px 0;
  margin: 1rem 0;
  font-size: 0.84375rem;
  color: var(--text-secondary);
}
.highlight-box strong { color: var(--text-primary); }

/* 页脚 */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 2rem 0 3.5rem;
  width: 100%;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  justify-content: space-between;
}
@media (min-width: 640px) {
  .footer-inner {
    flex-direction: row;
    align-items: center;
  }
}
.social-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.social-link {
  color: var(--text-secondary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: color 0.15s ease;
}
.social-link:hover { color: var(--text-primary); }
.social-link svg { width: 16px; height: 16px; }
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}
.footer-meta a { color: inherit; text-decoration: none; transition: color 0.15s ease; }
.footer-meta a:hover { color: var(--text-primary); }

/* 主题切换小圆点 (参考 extrastu.cn ThemeDot 规范) */
.theme-dot-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 0.5rem;
}
.theme-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-primary);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  outline-offset: 3px;
}
.theme-dot:hover { transform: scale(1.4); }
.theme-dot:focus-visible { outline: 2px solid var(--accent); }