:root {
  --primary: #FF5376;
  --secondary: #3B82F6;
  --accent-yellow: #FFD13B;
  --accent-green: #10B981;
  --accent-purple: #8B5CF6;
  --bg-main: #FFFDF9;
  --bg-card: #FFFFFF;
  --text-dark: #1E293B;
  --text-muted: #64748B;
  --border-color: #1E293B;
  --shadow-sketch: 4px 4px 0px #1E293B;
  --shadow-hover: 6px 6px 0px #1E293B;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-main);
  background-image: radial-gradient(#CBD5E1 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部导航 */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 253, 249, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--border-color);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ai-page-logo {
  height: 40px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-item {
  font-weight: 700;
  font-size: 15px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-item:hover {
  background: var(--accent-yellow);
  color: var(--text-dark);
  transform: translateY(-2px);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-sketch);
  transition: all 0.2s ease;
  cursor: pointer;
  text-align: center;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--border-color);
}

.btn-primary {
  background: var(--primary);
  color: #FFF;
}

.btn-secondary {
  background: var(--accent-yellow);
  color: var(--text-dark);
}

.btn-accent {
  background: var(--accent-green);
  color: #FFF;
}

/* 涂鸦徽章与标签 */
.doodle-badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--accent-yellow);
  border: 2px solid var(--border-color);
  border-radius: 20px;
  font-weight: 800;
  font-size: 13px;
  box-shadow: 2px 2px 0px var(--border-color);
  margin-bottom: 12px;
}

/* 首屏 Hero (无图片，纯CSS与涂鸦卡片) */
.hero-section {
  padding: 60px 0 40px;
  text-align: center;
  position: relative;
}

.hero-title {
  font-size: 38px;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 20px;
  color: var(--text-dark);
}

.hero-title .highlight {
  background: linear-gradient(120deg, #FFD13B 0%, #FFD13B 100%);
  background-repeat: no-repeat;
  background-size: 100% 35%;
  background-position: 0 88%;
  display: inline;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 30px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.stat-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  box-shadow: var(--shadow-sketch);
  text-align: center;
  position: relative;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 6px;
  right: 6px;
  height: 4px;
  background: var(--accent-yellow);
  border-radius: 2px;
}

.stat-num {
  font-size: 32px;
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 4px;
}

.stat-desc {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
}

/* 通用Section */
.section {
  padding: 60px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-title {
  font-size: 32px;
  font-weight: 900;
  margin-bottom: 12px;
}

.section-intro {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

/* 涂鸦卡片网格 */
.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.sketch-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sketch);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}

.sketch-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-hover);
}

.card-icon {
  width: 48px;
  height: 48px;
  background: #F1F5F9;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
  box-shadow: 2px 2px 0px var(--border-color);
}

.card-title {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 8px;
}

.card-desc {
  font-size: 14px;
  color: var(--text-muted);
  flex-grow: 1;
}

/* 标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.tag-item {
  font-size: 13px;
  font-weight: 700;
  padding: 4px 10px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background: #FFF;
}

/* 对比评测模块 */
.rating-highlight-box {
  background: #FFF7ED;
  border: 2px dashed #EA580C;
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.rating-score-block {
  display: flex;
  align-items: center;
  gap: 16px;
}

.big-score {
  font-size: 48px;
  font-weight: 900;
  color: #EA580C;
  line-height: 1;
}

.score-stars {
  font-size: 20px;
  color: #F59E0B;
}

.compare-table-wrapper {
  overflow-x: auto;
  background: #FFF;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sketch);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.compare-table th, .compare-table td {
  padding: 16px 20px;
  border-bottom: 1px solid #E2E8F0;
}

.compare-table th {
  background: #F8FAFC;
  font-weight: 800;
  border-bottom: 2px solid var(--border-color);
}

.compare-table tr:hover {
  background: #F1F5F9;
}

.col-brand {
  background: #EFF6FF;
  font-weight: 700;
  color: var(--secondary);
}

/* 图文与素材展示 */
.media-showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.media-item {
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #FFF;
  box-shadow: var(--shadow-sketch);
}

.media-item img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.media-info {
  padding: 16px;
}

/* 步骤流程 */
.step-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}

.step-card {
  background: #FFF;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sketch);
  position: relative;
}

.step-num-badge {
  position: absolute;
  top: -12px;
  left: 16px;
  background: var(--primary);
  color: #FFF;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 14px;
}

/* 用户评论 */
.comment-card {
  background: #FFF;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sketch);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.comment-user {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed #CBD5E1;
}

.user-avatar-tag {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-yellow);
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
}

/* FAQ 折叠面板 */
.faq-accordion {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: #FFF;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sketch);
  overflow: hidden;
}

.faq-question {
  padding: 18px 20px;
  font-weight: 800;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #FFF;
}

.faq-question:hover {
  background: #F8FAFC;
}

.faq-answer {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--text-muted);
  display: none;
  border-top: 1px dashed #E2E8F0;
  padding-top: 14px;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-toggle-icon {
  font-weight: 900;
  font-size: 18px;
  transition: transform 0.2s;
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(45deg);
}

/* 表单与需求匹配 */
.form-card {
  max-width: 700px;
  margin: 0 auto;
  background: #FFF;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sketch);
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-weight: 800;
  margin-bottom: 8px;
  font-size: 14px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: #F8FAFC;
  outline: none;
  font-family: inherit;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  background: #FFF;
  border-color: var(--primary);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

/* 联系与客服区 */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.contact-info-card {
  background: #FFF;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sketch);
}

.contact-qr-wrapper {
  text-align: center;
  padding: 16px;
  background: #FFF;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sketch);
}

.contact-qr-wrapper img {
  max-width: 180px;
  height: auto;
  border-radius: 8px;
  border: 1px solid #E2E8F0;
  margin-bottom: 10px;
}

/* 文章与友链 */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.article-card {
  background: #FFF;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow-sketch);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.friendlink-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.friendlink-wrapper a {
  background: #FFF;
  border: 2px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  box-shadow: 2px 2px 0px var(--border-color);
  transition: all 0.2s;
}

.friendlink-wrapper a:hover {
  background: var(--accent-yellow);
  transform: translateY(-2px);
}

/* Footer */
footer {
  background: #FFFDF9;
  border-top: 2px solid var(--border-color);
  padding: 40px 0 20px;
  margin-top: 60px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 30px;
  border-bottom: 1px dashed var(--border-color);
}

.footer-bottom {
  padding-top: 20px;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

/* 浮动客服 */
.floating-widget {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.float-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #FFF;
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-sketch);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  cursor: pointer;
  transition: all 0.2s;
}

.float-btn:hover {
  background: var(--accent-yellow);
  transform: scale(1.05);
}

/* 响应式调整 */
@media (max-width: 992px) {
  .hero-stats-grid, .card-grid-4, .step-container {
    grid-template-columns: repeat(2, 1fr);
  }
  .card-grid-3, .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 28px;
  }
  .nav-links {
    display: none;
  }
  .hero-stats-grid, .card-grid-3, .card-grid-4, .card-grid-2, .media-showcase-grid, .step-container, .contact-grid, .article-grid {
    grid-template-columns: 1fr;
  }
  .rating-highlight-box {
    flex-direction: column;
    text-align: center;
  }
  .floating-widget {
    bottom: 20px;
    right: 20px;
  }
}