:root {
  --primary-coral: #FF5A5F;
  --accent-amber: #FFB400;
  --accent-mint: #00D1B2;
  --accent-blue: #3A86FF;
  --accent-purple: #8338EC;
  --bg-creamy: #FAFAF8;
  --bg-white: #FFFFFF;
  --bg-soft-gradient: linear-gradient(135deg, #FFF6F5 0%, #F5FAFF 50%, #F9F5FF 100%);
  --text-main: #1F2430;
  --text-muted: #5C657B;
  --text-light: #8E98B0;
  --border-light: rgba(31, 36, 48, 0.08);
  --border-hover: rgba(255, 90, 95, 0.3);
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
  --card-shadow-hover: 0 18px 40px rgba(255, 90, 95, 0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-creamy);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  background: var(--bg-soft-gradient);
  background-attachment: fixed;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

.site-container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

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

.ai-page-logo {
  max-height: 42px;
  width: auto;
  object-fit: contain;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}

.nav-links li a {
  padding: 8px 14px;
  font-weight: 500;
  font-size: 15px;
  color: var(--text-main);
  border-radius: var(--radius-full);
}

.nav-links li a:hover {
  color: var(--primary-coral);
  background: rgba(255, 90, 95, 0.08);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-coral) 0%, #FF7E47 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(255, 90, 95, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 90, 95, 0.45);
  color: #FFFFFF;
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--text-main);
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.03);
  border-color: var(--text-muted);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-main);
  padding: 4px;
}

/* 通用Section布局 */
.section {
  padding: 72px 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(255, 90, 95, 0.12);
  color: var(--primary-coral);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
}

/* 首屏 Hero (无图片) */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
}

.hero-badge-group {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}

.hero-pill.coral { color: var(--primary-coral); border-color: rgba(255,90,95,0.2); }
.hero-pill.blue { color: var(--accent-blue); border-color: rgba(58,134,255,0.2); }
.hero-pill.mint { color: var(--accent-mint); border-color: rgba(0,209,178,0.2); }

.hero-title {
  font-size: 42px;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.25;
  max-width: 900px;
  margin: 0 auto 20px;
  letter-spacing: -0.5px;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--primary-coral), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.hero-actions .btn-hero-main {
  font-size: 17px;
  padding: 14px 34px;
}

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

.stat-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 24px 20px;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  text-align: left;
}

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

.stat-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary-coral);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 4px;
}

.stat-sub {
  font-size: 12px;
  color: var(--text-light);
}

/* 品牌与大模型聚合滚动条 */
.model-stream-box {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-bottom: 60px;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
}

.model-stream-title {
  text-align: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.model-tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.model-tag {
  background: var(--bg-creamy);
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--border-light);
  transition: var(--transition);
}

.model-tag:hover {
  background: #FFFFFF;
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-2px);
}

/* 平台核心卡片 Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.feature-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 28px;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--border-hover);
}

.feature-icon-badge {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 18px;
  background: rgba(255, 90, 95, 0.1);
  color: var(--primary-coral);
}

.feature-icon-badge.purple { background: rgba(131, 56, 236, 0.1); color: var(--accent-purple); }
.feature-icon-badge.blue { background: rgba(58, 134, 255, 0.1); color: var(--accent-blue); }
.feature-icon-badge.mint { background: rgba(0, 209, 178, 0.1); color: var(--accent-mint); }
.feature-icon-badge.amber { background: rgba(255, 180, 0, 0.1); color: var(--accent-amber); }

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  flex-grow: 1;
}

.card-footer-link {
  margin-top: 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-coral);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 媒体展示卡片 */
.media-showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.media-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
}

.media-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: #f0f0f0;
  overflow: hidden;
}

.media-img-wrap.square {
  aspect-ratio: 1/1;
}

.media-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.media-card:hover .media-img-wrap img {
  transform: scale(1.03);
}

.media-content {
  padding: 22px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.media-content h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.media-content p {
  font-size: 14px;
  color: var(--text-muted);
}

/* 宣传海报四宫格 */
.banner-gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.banner-gallery-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  background: #FFFFFF;
}

.banner-gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transition: var(--transition);
}

.banner-gallery-item:hover img {
  transform: scale(1.05);
}

/* 对比评测表格与评分卡 */
.evaluation-box {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  margin-bottom: 30px;
}

.eval-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 24px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
  gap: 16px;
}

.eval-score-badge {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.score-huge {
  font-size: 48px;
  font-weight: 900;
  color: var(--primary-coral);
  line-height: 1;
}

.score-max {
  font-size: 16px;
  color: var(--text-light);
}

.eval-stars {
  color: #FFB400;
  font-size: 20px;
  margin-left: 8px;
}

.eval-table-wrap {
  overflow-x: auto;
}

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

.eval-table th, .eval-table td {
  padding: 16px 18px;
  font-size: 14px;
  border-bottom: 1px solid var(--border-light);
}

.eval-table th {
  background: #F8FAFC;
  font-weight: 700;
  color: var(--text-main);
}

.eval-table td:first-child {
  font-weight: 600;
}

.eval-table tr:hover td {
  background: #FFFDF9;
}

.tag-adv {
  background: rgba(0, 209, 178, 0.12);
  color: #008774;
  padding: 4px 10px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 12px;
}

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

.step-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  position: relative;
}

.step-number {
  font-size: 32px;
  font-weight: 900;
  color: rgba(255, 90, 95, 0.2);
  line-height: 1;
  margin-bottom: 12px;
}

.step-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 13px;
  color: var(--text-muted);
}

/* FAQ 手风琴 */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
}

.faq-question {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question:hover {
  color: var(--primary-coral);
}

.faq-icon {
  font-size: 18px;
  transition: var(--transition);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--primary-coral);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: #FCFCFA;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 用户评价卡片 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

.user-avatar-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-mint));
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.user-info h5 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
}

.user-info span {
  font-size: 12px;
  color: var(--text-light);
}

/* 表单与联系区 */
.contact-section-box {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
}

.contact-info-pane {
  background: linear-gradient(135deg, #FFF0ED 0%, #FFF9F2 100%);
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.contact-info-pane h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.contact-meta-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 24px 0;
}

.contact-meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
}

.qr-block {
  text-align: center;
  padding: 16px;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  display: inline-block;
  max-width: 170px;
}

.qr-block img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: block;
}

.qr-block span {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
  display: block;
}

.contact-form-pane {
  padding: 40px;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: #FAFAFA;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-coral);
  background: #FFFFFF;
  box-shadow: 0 0 0 3px rgba(255, 90, 95, 0.15);
}

textarea.form-control {
  resize: vertical;
  min-height: 90px;
}

/* 文章列表与资讯 */
.articles-simple-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.article-box-item {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
}

.article-box-item h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.article-box-item p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
  flex-grow: 1;
}

.article-links-strip {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 16px 24px;
  margin-top: 20px;
  border: 1px solid var(--border-light);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.article-links-strip span {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-main);
}

.article-links-strip a {
  font-size: 13px;
  color: var(--accent-blue);
  text-decoration: underline;
  margin-right: 8px;
}

/* 页脚与友情链接 */
.site-footer {
  background: #FFFFFF;
  border-top: 1px solid var(--border-light);
  padding: 50px 0 30px;
  margin-top: 60px;
}

.footer-main-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 30px;
  margin-bottom: 40px;
}

.footer-brand h4 {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.footer-brand p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links-list a {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-links-list a:hover {
  color: var(--primary-coral);
}

.friend-links-box {
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  margin-bottom: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.friend-links-box span {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}

.friend-links-box a {
  font-size: 13px;
  color: var(--text-muted);
}

.friend-links-box a:hover {
  color: var(--primary-coral);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
  font-size: 13px;
  color: var(--text-light);
}

/* 浮动工具栏与客服 */
.floating-widget {
  position: fixed;
  right: 20px;
  bottom: 30px;
  z-index: 99;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.float-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: #FFFFFF;
  box-shadow: 0 4px 14px rgba(0,0,0,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid var(--border-light);
  color: var(--text-main);
  position: relative;
  transition: var(--transition);
}

.float-btn:hover {
  transform: scale(1.08);
  color: var(--primary-coral);
}

.float-popover {
  position: absolute;
  right: 56px;
  bottom: 0;
  background: #FFFFFF;
  padding: 12px;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
  border: 1px solid var(--border-light);
  display: none;
  width: 140px;
  text-align: center;
}

.float-btn:hover .float-popover {
  display: block;
}

.float-popover img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

.float-popover span {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
  display: block;
}

/* 响应式适配 */
@media (max-width: 992px) {
  .hero-title { font-size: 32px; }
  .grid-3, .grid-4, .hero-stats-grid, .steps-grid, .reviews-grid, .articles-simple-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .banner-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-section-box {
    grid-template-columns: 1fr;
  }
  .footer-main-grid {
    grid-template-columns: 1fr 1fr;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    border-bottom: 1px solid var(--border-light);
  }
  .nav-links.active {
    display: flex;
  }
  .nav-links li {
    width: 100%;
    text-align: center;
  }
  .nav-links li a {
    display: block;
    padding: 10px;
  }
  .menu-toggle {
    display: block;
  }
}

@media (max-width: 640px) {
  .hero-title { font-size: 26px; }
  .section { padding: 48px 0; }
  .grid-3, .grid-4, .hero-stats-grid, .steps-grid, .reviews-grid, .media-showcase-grid, .banner-gallery-grid, .articles-simple-grid, .footer-main-grid {
    grid-template-columns: 1fr;
  }
  .eval-top-bar { flex-direction: column; align-items: flex-start; }
  .contact-info-pane, .contact-form-pane { padding: 24px; }
}