/* Header 导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 253, 246, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1.5px solid var(--color-border);
  padding: 14px 0;
  transition: all 0.25s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-slate);
}

.brand-logo-link:hover {
  transform: scale(1.02);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-slate);
  padding: 6px 4px;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-coral);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-coral);
  transition: width 0.2s ease;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-cta-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-menu-toggle {
  display: none;
  background: var(--color-white);
  border: 1.5px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: pointer;
}

.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 65px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-main);
  padding: 24px 20px;
  z-index: 99;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
  border-top: 1.5px solid var(--color-border);
}

.mobile-nav-drawer.open {
  display: flex;
}

.mobile-nav-drawer .nav-link {
  font-size: 1.15rem;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

/* Hero 首屏 */
.hero-section {
  padding: 64px 0 48px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 40px;
}

.hero-h1-seo {
  font-size: 0.92rem;
  color: var(--color-purple);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-purple-light);
  padding: 6px 14px;
  border-radius: var(--radius-full);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.18;
  color: var(--color-slate);
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.hero-title .highlight-pink {
  color: var(--color-coral);
  position: relative;
  display: inline-block;
}

.hero-title .highlight-purple {
  color: var(--color-purple);
}

.hero-desc {
  font-size: 1.12rem;
  line-height: 1.75;
  color: var(--color-text-sec);
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 36px;
}

.hero-trust-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--color-text-sec);
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-visual-card {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-mascot-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  padding: 20px;
}

/* Feature 区域 (为什么选择 Kitty Network) */
.features-section {
  padding: 72px 0;
  background: linear-gradient(180deg, var(--bg-main) 0%, #FFF8EE 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.feature-box {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-border);
  padding: 28px;
  position: relative;
  transition: all 0.25s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.feature-box:hover {
  transform: translateY(-4px);
  border-color: var(--color-purple);
  box-shadow: var(--shadow-lg);
}

.feature-icon-bubble {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.6rem;
}

.feature-box h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--color-slate);
}

.feature-box p {
  font-size: 0.95rem;
  color: var(--color-text-sec);
  line-height: 1.68;
}

/* 核心特色 1: Kitty Quick Start 连接任务板 */
.quickstart-section {
  padding: 80px 0;
  position: relative;
}

.taskboard-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  border: 2px solid var(--color-slate);
  box-shadow: var(--shadow-pop-lg);
  padding: 36px;
  margin-top: 24px;
}

.taskboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 2px dashed var(--color-border);
}

.progress-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.progress-bar-outer {
  width: 240px;
  height: 14px;
  background: #EEE9DC;
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1.5px solid var(--color-slate);
}

.progress-bar-inner {
  height: 100%;
  background: linear-gradient(90deg, var(--color-coral) 0%, var(--color-yellow) 100%);
  border-radius: var(--radius-full);
  transition: width 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.task-item {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: all 0.2s ease;
  background: var(--bg-main);
}

.task-item.completed {
  border-color: #79caa8;
  background: var(--color-mint-light);
}

.task-item-main {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  cursor: pointer;
}

.task-checkbox-wrap {
  position: relative;
  margin-top: 3px;
}

.task-checkbox-custom {
  width: 22px;
  height: 22px;
  border: 2px solid var(--color-slate);
  border-radius: 6px;
  background: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.task-item.completed .task-checkbox-custom {
  background: var(--color-coral);
  border-color: var(--color-coral);
  color: var(--color-white);
}

.task-text-wrap {
  flex: 1;
}

.task-title {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-slate);
  display: flex;
  align-items: center;
  gap: 8px;
}

.task-item.completed .task-title {
  text-decoration: line-through;
  color: var(--color-text-sec);
}

.task-desc {
  font-size: 0.9rem;
  color: var(--color-text-sec);
  margin-top: 4px;
  line-height: 1.5;
}

.task-step-details {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
  font-size: 0.88rem;
  color: var(--color-slate);
  display: none;
}

.task-item.expanded .task-step-details {
  display: block;
}

.task-link-action {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-purple);
  font-weight: 700;
  margin-top: 6px;
}

.task-link-action:hover {
  text-decoration: underline;
}

/* 核心特色 2: 问问 Kitty 中文搜索 */
.search-section {
  padding: 60px 0 40px;
}

.search-box-wrap {
  background: var(--color-white);
  border: 2px solid var(--color-slate);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-pop);
  padding: 8px 12px 8px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 720px;
  margin: 0 auto 24px;
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1.05rem;
  background: transparent;
  padding: 8px 0;
  color: var(--color-slate);
}

.search-input::placeholder {
  color: #9ea5b3;
}

.search-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  max-width: 760px;
  margin: 0 auto;
}

.search-tag-pill {
  padding: 5px 12px;
  border-radius: var(--radius-full);
  background: var(--color-white);
  border: 1.5px solid var(--color-border);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-slate);
  cursor: pointer;
  transition: all 0.15s ease;
}

.search-tag-pill:hover {
  border-color: var(--color-slate);
  background: var(--color-yellow-light);
  transform: translateY(-1px);
}

.search-results-panel {
  max-width: 760px;
  margin: 20px auto 0;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  padding: 20px;
  display: none;
}

.search-results-panel.has-results {
  display: block;
}

.search-result-item {
  padding: 12px;
  border-bottom: 1px solid var(--color-border);
  transition: background 0.15s ease;
  border-radius: var(--radius-sm);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: var(--bg-main);
}

.search-result-title {
  font-weight: 700;
  color: var(--color-purple);
  margin-bottom: 4px;
  display: block;
}

.search-result-snippet {
  font-size: 0.88rem;
  color: var(--color-text-sec);
  line-height: 1.5;
}

/* 套餐价格区域 */
.pricing-section {
  padding: 80px 0;
  background-color: var(--bg-main);
}

.pricing-cycle-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-bottom: 40px;
  background: #EFEADF;
  padding: 4px;
  border-radius: var(--radius-full);
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.cycle-btn {
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.92rem;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--color-slate);
  transition: all 0.2s ease;
}

.cycle-btn.active {
  background: var(--color-white);
  color: var(--color-slate);
  box-shadow: var(--shadow-sm);
}

.pricing-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  border: 2px solid var(--color-slate);
  box-shadow: var(--shadow-pop);
  padding: 36px 30px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-pop-lg);
}

.pricing-card.featured {
  border-color: var(--color-coral);
  border-width: 2.5px;
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  right: 24px;
  background: var(--color-coral);
  color: var(--color-white);
  font-weight: 800;
  font-size: 0.78rem;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-slate);
  box-shadow: 0 2px 0 var(--color-slate);
}

.pricing-plan-name {
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--color-slate);
  margin-bottom: 6px;
}

.pricing-plan-target {
  font-size: 0.88rem;
  color: var(--color-text-sec);
  margin-bottom: 20px;
  min-height: 40px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 12px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-slate);
}

.price-amount {
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-slate);
  line-height: 1;
}

.price-unit {
  font-size: 0.95rem;
  color: var(--color-text-sec);
  font-weight: 600;
}

.price-calc-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--color-yellow-light);
  color: #8c7300;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.pricing-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
  border-top: 1px dashed var(--color-border);
  padding-top: 20px;
}

.pricing-spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--color-slate);
}

.spec-icon-check {
  color: #17684d;
  font-weight: 800;
}

.pricing-notice-box {
  background: var(--color-yellow-light);
  border: 1.5px solid #E5C53B;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-top: 36px;
  font-size: 0.9rem;
  color: #695600;
  line-height: 1.6;
}

/* 下载中心区域 */
.download-section {
  padding: 72px 0;
}

.download-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-border);
  padding: 24px;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.download-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-purple);
  box-shadow: var(--shadow-lg);
}

.download-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.download-os-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.download-app-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.download-app-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg-main);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
}

/* 用户体验场景 */
.testimonials-section {
  padding: 72px 0;
  background: #FFF9F4;
}

.scenario-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-border);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.scenario-header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.scenario-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-coral-light);
  border: 1.5px solid var(--color-coral);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.scenario-user-name {
  font-weight: 800;
  font-size: 1rem;
  color: var(--color-slate);
}

.scenario-tag {
  font-size: 0.8rem;
  color: var(--color-text-sec);
}

.scenario-body {
  font-size: 0.94rem;
  color: var(--color-slate);
  line-height: 1.68;
}

/* FAQ 常见问题折叠面板 */
.faq-section {
  padding: 72px 0;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border);
  transition: all 0.2s ease;
  overflow: hidden;
}

.faq-item.active {
  border-color: var(--color-coral);
  box-shadow: var(--shadow-md);
}

.faq-question-btn {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-slate);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  gap: 16px;
}

.faq-icon-arrow {
  transition: transform 0.25s ease;
  flex-shrink: 0;
  font-size: 0.9rem;
  color: var(--color-coral);
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
  padding: 0 24px;
  font-size: 0.95rem;
  color: var(--color-slate-light);
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 800px;
  padding: 0 24px 20px 24px;
}

/* 文章目录与阅读排版 */
.article-header {
  padding: 48px 0 32px;
  border-bottom: 1.5px solid var(--color-border);
  margin-bottom: 40px;
}

.article-title {
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-slate);
  margin: 16px 0;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--color-text-sec);
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--color-slate);
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-coral-light);
  color: var(--color-slate);
}

.article-content h3 {
  font-size: 1.28rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--color-purple);
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 16px 0 24px 24px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1.5px solid var(--color-border);
}

.article-content th, .article-content td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.article-content th {
  background: var(--color-yellow-light);
  font-weight: 700;
}

.article-content blockquote {
  border-left: 4px solid var(--color-coral);
  background: var(--color-coral-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
  font-style: normal;
}

.article-content code {
  background: #EFECE4;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--color-purple-dark);
}

.article-content a {
  color: var(--color-purple);
  text-decoration: underline;
  font-weight: 600;
}

.article-content a:hover {
  color: var(--color-coral);
}

.article-footer-cta {
  margin-top: 48px;
  padding: 32px;
  background: linear-gradient(135deg, var(--color-purple-light) 0%, #FFF5F7 100%);
  border: 2px solid var(--color-slate);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-pop);
  text-align: center;
}

.related-articles {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1.5px solid var(--color-border);
}

/* Footer 页脚 */
.site-footer {
  background-color: var(--color-slate);
  color: #B4B9C8;
  padding: 64px 0 32px;
  margin-top: auto;
  border-top: 3px solid var(--color-coral);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-title {
  color: var(--color-white);
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 320px;
  margin-bottom: 20px;
}

.footer-heading {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
}

.footer-link-list a:hover {
  color: var(--color-yellow);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
}

.back-to-top-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-coral);
  color: var(--color-white);
  border: 2px solid var(--color-slate);
  box-shadow: var(--shadow-pop);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 90;
  transition: all 0.2s ease;
}

.back-to-top-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-pop-lg);
}

.back-to-top-btn.visible {
  display: flex;
}

/* 响应式优化 */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-h1-seo {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-trust-tags {
    justify-content: center;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu, .nav-cta-group {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .taskboard-card {
    padding: 20px;
  }
  .progress-bar-outer {
    width: 100%;
  }
  .article-title {
    font-size: 1.8rem;
  }
}