/**
 * 小裂变 GEO 专题壳层（对齐 https://www.xiaoliebian.com/ai/geo/）
 * 与 css/styles.css 叠加使用：正文区仍用浅色模块与资讯卡片。
 */

:root {
  --ai-geo-bg: #0a0f1c;
  --ai-geo-border: rgba(255, 255, 255, 0.06);
  --ai-geo-text: #ffffff;
  --ai-geo-muted: #d1d5db;
  --ai-geo-muted2: #9ca3af;
  --ai-geo-blue: #2563eb;
  --ai-geo-blue-hover: #1d4ed8;
  --ai-geo-header-h: 4rem;
}

.ai-geo-page {
  padding-top: var(--ai-geo-header-h);
}

/* —— Header —— */
.ai-geo-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  /* 与 ../index.html #root 顶栏一致：全宽条 + bg[#0a0f1c]/80、backdrop-blur-xl、border-white/5 */
  background: rgba(10, 15, 28, 0.8);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* 与 index 同构：外层 max-w-7xl 内胆，内层 flex 主行（等价 Tailwind max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 + flex 行） */
.geo-site-header-track {
  max-width: 80rem;
  margin-left: auto;
  margin-right: auto;
  padding: 0.625rem 1rem;
  box-sizing: border-box;
}

@media (min-width: 640px) {
  .geo-site-header-track {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .geo-site-header-track {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.geo-site-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 2.5rem;
  height: auto;
  gap: 0.75rem;
}

.geo-site-header-row .ai-geo-nav-desktop {
  padding: 0.375rem 0;
}

.geo-site-header-row .ai-geo-header-cta {
  padding: 0.375rem 0;
}

.geo-site-logo-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
  white-space: nowrap;
}

.ai-geo-header .geo-site-logo .ai-geo-logo-img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.ai-geo-header .btn-free-trial {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  white-space: nowrap;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.25;
  padding: 0.5rem 1rem;
  background: var(--ai-geo-blue);
  color: #fff;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s ease;
}

.ai-geo-header .btn-free-trial:hover {
  background: var(--ai-geo-blue-hover);
}

.ai-geo-header-cta > a {
  text-decoration: none;
  display: inline-block;
}

.ai-geo-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--ai-geo-text);
  padding: 0.375rem 0;
  font-size: 1.125rem;
  line-height: 1.2;
}

/* 图标与右侧字标同尺度（em），contain 避免裁切变形 */
.ai-geo-logo-img {
  width: 1.5em;
  height: 1.5em;
  flex-shrink: 0;
  object-fit: contain;
  border-radius: 8px;
  display: block;
}

.ai-geo-logo-text {
  display: inline-flex;
  align-items: baseline;
  gap: 0;
  font-weight: 700;
  white-space: nowrap;
}

.ai-geo-logo-cn {
  color: #fff;
  letter-spacing: 0.02em;
}

/* 与 site-design 专题「GEO」渐变字一致 */
.ai-geo-logo-geo {
  margin-left: 0.06em;
  font-weight: 700;
  background: linear-gradient(90deg, #a78bfa 0%, #8b5cf6 50%, #7c3aed 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.ai-geo-nav-desktop {
  display: none;
  align-items: center;
  gap: 0.25rem;
}

@media (min-width: 768px) {
  .ai-geo-nav-desktop {
    display: flex;
  }
}

.ai-geo-nav-desktop a,
.ai-geo-nav-desktop button.ai-geo-nav-link-btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  color: var(--ai-geo-muted);
  text-decoration: none;
  border: none;
  background: transparent;
  border-radius: 0.5rem;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.2s, background 0.2s;
}

.ai-geo-nav-desktop a:hover,
.ai-geo-nav-desktop button.ai-geo-nav-link-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

a.ai-geo-nav-link-btn {
  display: inline-block;
}

.ai-geo-nav-desktop a[aria-current="page"] {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.ai-geo-header-cta {
  display: none;
}

@media (min-width: 768px) {
  .ai-geo-header-cta {
    display: block;
  }
}

.ai-geo-btn-trial {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #fff;
  background: var(--ai-geo-blue);
  border: none;
  border-radius: 0.375rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
}

.ai-geo-btn-trial:hover {
  background: var(--ai-geo-blue-hover);
}

.ai-geo-menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  color: var(--ai-geo-muted);
  background: transparent;
  border: none;
  border-radius: 0.25rem;
  cursor: pointer;
}

.ai-geo-menu-toggle:hover {
  color: #fff;
}

@media (min-width: 768px) {
  .ai-geo-menu-toggle {
    display: none;
  }
}

/* —— Mobile menu —— */
.ai-geo-mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.25s, visibility 0.25s;
}

.ai-geo-mobile-overlay.is-open {
  visibility: visible;
  opacity: 1;
}

.ai-geo-mobile-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}

.ai-geo-mobile-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(100%, 320px);
  height: 100%;
  background: var(--ai-geo-bg);
  border-left: 1px solid var(--ai-geo-border);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.25s ease;
}

.ai-geo-mobile-overlay.is-open .ai-geo-mobile-panel {
  transform: translateX(0);
}

.ai-geo-mobile-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--ai-geo-border);
}

.ai-geo-mobile-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: #fff;
  font-weight: 700;
  font-size: 1.0625rem;
  line-height: 1.2;
}

.ai-geo-mobile-logo .ai-geo-logo-img {
  width: 1.45em;
  height: 1.45em;
}

.ai-geo-mobile-close {
  padding: 0.5rem;
  color: var(--ai-geo-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: 0.25rem;
}

.ai-geo-mobile-close:hover {
  color: #fff;
}

.ai-geo-mobile-nav {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  gap: 0.25rem;
}

.ai-geo-mobile-nav a {
  padding: 0.75rem 1rem;
  color: var(--ai-geo-muted);
  text-decoration: none;
  border-radius: 0.5rem;
  font-size: 0.9375rem;
}

.ai-geo-mobile-nav a:hover,
.ai-geo-mobile-nav a[aria-current="page"] {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.ai-geo-mobile-cta {
  margin: 1rem;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: #fff;
  background: var(--ai-geo-blue);
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
}

.ai-geo-mobile-cta:hover {
  background: var(--ai-geo-blue-hover);
}

/* —— Footer —— */
.ai-geo-footer {
  position: relative;
  padding: 3rem 0 2rem;
  overflow: hidden;
  border-top: 1px solid var(--ai-geo-border);
  background: var(--ai-geo-bg);
  color: var(--ai-geo-muted2);
}

.ai-geo-footer-inner {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

.ai-geo-footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (min-width: 1024px) {
  .ai-geo-footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
  }
}

.ai-geo-footer-brand .ai-geo-logo {
  margin-bottom: 1rem;
}

.ai-geo-footer-tagline {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--ai-geo-muted2);
  max-width: 20rem;
}

.ai-geo-footer-col h4 {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
}

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

.ai-geo-footer-col li {
  margin-bottom: 0.75rem;
}

.ai-geo-footer-col a {
  font-size: 0.875rem;
  color: var(--ai-geo-muted2);
  text-decoration: none;
  transition: color 0.2s;
}

.ai-geo-footer-col a:hover {
  color: #fff;
}

.ai-geo-footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--ai-geo-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

@media (min-width: 640px) {
  .ai-geo-footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.ai-geo-footer-copy {
  margin: 0;
  font-size: 0.875rem;
  color: #64748b;
}

.ai-geo-footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  justify-content: center;
}

.ai-geo-footer-legal a {
  font-size: 0.875rem;
  color: #64748b;
  text-decoration: none;
}

.ai-geo-footer-legal a:hover {
  color: #fff;
}

body.ai-geo-shell-active {
  margin: 0;
}

body.ai-geo-shell-active.ai-geo-mobile-open {
  overflow: hidden;
}