:root {
  --neon-cyan: #00f0ff;
  --neon-purple: #9d00ff;
  --neon-green: #00ff88;
  --neon-pink: #ff007f;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --border-light: rgba(0, 240, 255, 0.25);
  --border-solid: #e2e8f0;
  --shadow-neon: 0 10px 30px rgba(0, 240, 255, 0.12);
  --shadow-hover: 0 16px 36px rgba(157, 0, 255, 0.16);
  --radius-card: 16px;
  --radius-pill: 9999px;
  --transition: all 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(circle at 10% 10%, rgba(0, 240, 255, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 90% 20%, rgba(157, 0, 255, 0.04) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(0, 255, 136, 0.03) 0%, transparent 50%);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

.ai-container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 240, 255, 0.2);
  box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}

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

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

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

.brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  background: linear-gradient(135deg, #0f172a, #2563eb);
  -webkit-background-clip: text;
  color: #0f172a;
  letter-spacing: -0.5px;
}

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

.nav-links li {
  margin: 0 10px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: #0284c7;
  background: rgba(0, 240, 255, 0.08);
}

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

.btn-primary-neon {
  background: linear-gradient(135deg, #00f0ff 0%, #0284c7 100%);
  color: #04101e;
  font-weight: 700;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-size: 0.95rem;
  box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
}

.btn-primary-neon:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 240, 255, 0.5);
  color: #000;
}

.btn-purple-neon {
  background: linear-gradient(135deg, #9d00ff 0%, #6366f1 100%);
  color: #ffffff;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-size: 0.95rem;
  box-shadow: 0 4px 15px rgba(157, 0, 255, 0.3);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-purple-neon:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(157, 0, 255, 0.45);
}

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-solid);
  padding: 8px;
  border-radius: 6px;
  cursor: pointer;
}

/* 模块公共 */
section {
  padding: 80px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: rgba(0, 240, 255, 0.1);
  color: #0284c7;
  border: 1px solid rgba(0, 240, 255, 0.3);
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  line-height: 1.3;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* 首屏 Hero (无任何图片) */
.hero-section {
  padding: 100px 0 80px;
  background: 
    radial-gradient(60% 60% at 50% 20%, rgba(0, 240, 255, 0.09) 0%, rgba(157, 0, 255, 0.05) 50%, transparent 100%),
    linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  border-bottom: 1px solid rgba(0, 240, 255, 0.15);
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(0, 240, 255, 0.4);
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
  color: #0369a1;
  box-shadow: 0 4px 15px rgba(0, 240, 255, 0.1);
  margin-bottom: 24px;
}

.hero-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--neon-green);
  box-shadow: 0 0 10px var(--neon-green);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-h1 {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1.25;
  color: #0f172a;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-lead {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-cta-main {
  font-size: 1.1rem;
  padding: 16px 36px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, #00f0ff 0%, #0077ff 100%);
  color: #021526;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 8px 25px rgba(0, 240, 255, 0.4);
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.4);
}

.hero-cta-main:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 30px rgba(0, 240, 255, 0.6);
  color: #000;
}

.hero-cta-secondary {
  font-size: 1.1rem;
  padding: 16px 34px;
  border-radius: var(--radius-pill);
  background: #ffffff;
  color: var(--text-primary);
  font-weight: 700;
  text-decoration: none;
  border: 1px solid #cbd5e1;
  box-shadow: 0 4px 15px rgba(0,0,0,0.04);
  transition: var(--transition);
}

.hero-cta-secondary:hover {
  border-color: var(--neon-purple);
  color: var(--neon-purple);
  transform: translateY(-2px);
}

/* 核心指标仪表卡片 (首屏纯CSS) */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1080px;
  margin: 0 auto;
}

.stat-item-box {
  background: #ffffff;
  padding: 24px;
  border-radius: var(--radius-card);
  border: 1px solid rgba(0, 240, 255, 0.25);
  box-shadow: 0 8px 24px rgba(0,0,0,0.03);
  text-align: center;
  transition: var(--transition);
}

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

.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: #0f172a;
  display: block;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* 平台能力矩阵 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-solid);
  border-radius: var(--radius-card);
  padding: 30px 24px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.02);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--neon-cyan);
  box-shadow: 0 12px 28px rgba(0, 240, 255, 0.12);
}

.feature-badge-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 20px;
  background: rgba(0, 240, 255, 0.08);
  color: #0284c7;
  border: 1px solid rgba(0, 240, 255, 0.25);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  flex-grow: 1;
}

/* 行业方案与场景胶囊 */
.scene-capsules {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 30px;
}

.scene-capsule-item {
  background: #ffffff;
  border: 1px solid rgba(226, 232, 240, 0.8);
  padding: 18px 20px;
  border-radius: 12px;
  transition: var(--transition);
  border-left: 4px solid var(--neon-cyan);
}

.scene-capsule-item:hover {
  background: #ffffff;
  border-left-color: var(--neon-purple);
  box-shadow: 0 8px 20px rgba(157, 0, 255, 0.08);
  transform: translateX(4px);
}

.scene-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.scene-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* 多模型网格标签 */
.models-matrix {
  background: #ffffff;
  border: 1px solid var(--border-solid);
  border-radius: var(--radius-card);
  padding: 36px;
  margin-top: 40px;
}

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

.model-tag {
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  color: #334155;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition);
}

.model-tag:hover {
  background: #0f172a;
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
  transform: translateY(-2px);
}

/* 媒体图片展示区 (非首屏) */
.media-showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.media-card {
  background: #ffffff;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--border-solid);
  box-shadow: 0 6px 20px rgba(0,0,0,0.03);
}

.media-thumb-box {
  width: 100%;
  position: relative;
  overflow: hidden;
  background: #0f172a;
}

.media-thumb-box img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.4s ease;
}

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

.media-info {
  padding: 20px;
}

.media-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.media-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* 对比评测推荐模块 */
.rating-highlight-box {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.08) 0%, rgba(157, 0, 255, 0.08) 100%);
  border: 2px solid rgba(0, 240, 255, 0.4);
  border-radius: var(--radius-card);
  padding: 30px;
  margin-bottom: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.rating-score-left {
  display: flex;
  align-items: center;
  gap: 20px;
}

.rating-star-badge {
  font-size: 1.8rem;
  color: #f59e0b;
}

.rating-num-big {
  font-size: 2.8rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1;
}

.rating-title-desc {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.rating-sub {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.compare-table-wrapper {
  background: #ffffff;
  border-radius: var(--radius-card);
  border: 1px solid var(--border-solid);
  overflow-x: auto;
  box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}

.compare-table th, 
.compare-table td {
  padding: 18px 24px;
  border-bottom: 1px solid #edf2f7;
  font-size: 0.95rem;
}

.compare-table th {
  background: #f8fafc;
  color: #334155;
  font-weight: 700;
}

.compare-table tr:last-child td {
  border-bottom: none;
}

.compare-table .brand-col {
  background: rgba(0, 240, 255, 0.04);
  font-weight: 700;
  color: #0369a1;
  border-left: 1px solid rgba(0, 240, 255, 0.2);
  border-right: 1px solid rgba(0, 240, 255, 0.2);
}

.compare-table th.brand-col {
  background: rgba(0, 240, 255, 0.1);
  color: #0f172a;
}

.check-icon {
  color: #10b981;
  font-weight: bold;
  margin-right: 6px;
}

/* 客户评论专区 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: #ffffff;
  border: 1px solid var(--border-solid);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: 0 4px 18px rgba(0,0,0,0.02);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.review-card:hover {
  border-color: var(--neon-cyan);
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  position: relative;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px dashed #e2e8f0;
  padding-top: 16px;
}

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00f0ff, #9d00ff);
  color: #ffffff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.reviewer-name {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.reviewer-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* FAQ 手风琴 */
.faq-accordion-group {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item-accordion {
  background: #ffffff;
  border: 1px solid var(--border-solid);
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-header-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-arrow {
  font-size: 1rem;
  color: #0284c7;
  transition: transform 0.2s ease;
}

.faq-body-content {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  display: none;
}

.faq-item-accordion.active {
  border-color: rgba(0, 240, 255, 0.5);
  box-shadow: 0 4px 20px rgba(0, 240, 255, 0.08);
}

.faq-item-accordion.active .faq-body-content {
  display: block;
}

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

/* 需求提交与联系我们 (双列) */
.contact-section-inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  background: #ffffff;
  border-radius: var(--radius-card);
  padding: 48px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-neon);
}

.contact-info-col {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.info-box-item {
  margin-bottom: 20px;
}

.info-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.info-val {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.qr-code-holder {
  margin-top: 24px;
  padding: 16px;
  background: #f8fafc;
  border-radius: 12px;
  display: inline-block;
  border: 1px dashed #cbd5e1;
  text-align: center;
}

.qr-code-holder img {
  max-width: 140px;
  height: auto;
  border-radius: 8px;
  display: block;
  margin: 0 auto 8px;
}

.qr-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 需求表单 */
.custom-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid #cbd5e1;
  background: #f8fafc;
  font-size: 0.95rem;
  color: var(--text-primary);
  transition: var(--transition);
  font-family: inherit;
}

.form-control:focus {
  outline: none;
  border-color: #00f0ff;
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.2);
}

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

/* 最新文章与资讯 */
.articles-wrapper {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 30px;
}

.article-link-card {
  background: #ffffff;
  border: 1px solid var(--border-solid);
  padding: 20px;
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.article-link-card:hover {
  transform: translateY(-3px);
  border-color: var(--neon-cyan);
  box-shadow: 0 8px 24px rgba(0, 240, 255, 0.1);
}

.article-title-text {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.article-sub-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 友情链接 */
.links-section {
  padding: 40px 0;
  background: #ffffff;
  border-top: 1px solid var(--border-solid);
}

.links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.links-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-right: 8px;
}

.links-grid a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 14px;
  background: #f1f5f9;
  border-radius: var(--radius-pill);
  transition: var(--transition);
}

.links-grid a:hover {
  color: #0284c7;
  background: rgba(0, 240, 255, 0.1);
}

/* 页脚 */
.site-footer {
  background: #0b1120;
  color: #94a3b8;
  padding: 60px 0 30px;
  border-top: 1px solid rgba(0, 240, 255, 0.2);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h4 {
  color: #ffffff;
  font-size: 1.4rem;
  margin-bottom: 14px;
  font-weight: 800;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.6;
  max-width: 360px;
}

.footer-col h5 {
  color: #f8fafc;
  font-size: 1.05rem;
  margin-bottom: 16px;
  font-weight: 700;
}

.footer-nav {
  list-style: none;
}

.footer-nav li {
  margin-bottom: 10px;
}

.footer-nav a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-nav a:hover {
  color: var(--neon-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: #64748b;
}

/* 浮动客服栏 */
.floating-assistant {
  position: fixed;
  right: 24px;
  bottom: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.float-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: #0f172a;
  border: 1px solid var(--neon-cyan);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.2rem;
  box-shadow: 0 4px 20px rgba(0, 240, 255, 0.3);
  cursor: pointer;
  transition: var(--transition);
}

.float-btn:hover {
  background: var(--neon-cyan);
  color: #000000;
  transform: scale(1.1);
}

/* 响应式适配 */
@media (max-width: 992px) {
  .hero-h1 { font-size: 2.2rem; }
  .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .scene-capsules { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
  .contact-section-inner { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .articles-wrapper { grid-template-columns: 1fr; }
  .media-showcase-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  .hero-h1 { font-size: 1.8rem; }
  .features-grid { grid-template-columns: 1fr; }
  .scene-capsules { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .hero-stats-grid { grid-template-columns: 1fr; }
  .rating-highlight-box { flex-direction: column; align-items: flex-start; }
}