:root {
  --primary: #d32f2f;
  --primary-dark: #b71c1c;
  --primary-light: #ffebee;
  --accent: #ff5252;
  --accent-gold: #ffb300;
  --text-main: #1f2937;
  --text-muted: #4b5563;
  --text-light: #9ca3af;
  --bg-page: #faf7f7;
  --bg-card: #ffffff;
  --bg-alt: #fef2f2;
  --border-color: #fecaca;
  --shadow-sm: 0 2px 4px rgba(211, 47, 47, 0.05);
  --shadow-md: 0 8px 24px rgba(211, 47, 47, 0.08);
  --shadow-lg: 0 16px 36px rgba(211, 47, 47, 0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --max-w: 1200px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  width: 100%;
  overflow-x: hidden;
  background-color: var(--bg-page);
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}

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

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-area img {
  height: 42px;
  width: auto;
  display: block;
}

.logo-text {
  font-size: 20px;
  font-weight: 800;
  color: var(--primary-dark);
  letter-spacing: -0.5px;
}

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

.nav-links a {
  display: inline-block;
  padding: 8px 14px;
  color: var(--text-main);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  transition: var(--transition);
  border-radius: var(--radius-sm);
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--primary);
  background: var(--primary-light);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--primary-dark));
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(211, 47, 47, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(211, 47, 47, 0.45);
}

.btn-secondary {
  background: #ffffff;
  color: var(--primary-dark);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--primary-light);
  border-color: var(--primary);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-main);
  margin: 5px 0;
  transition: var(--transition);
}

/* Hero 首屏 - 严格无图，纯CSS与科技视觉 */
.hero-section {
  position: relative;
  padding: 90px 0 70px;
  background: linear-gradient(180deg, #ffffff 0%, #fff5f5 100%);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

.hero-glow-1 {
  position: absolute;
  top: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 82, 82, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
  pointer-events: none;
}

.hero-glow-2 {
  position: absolute;
  bottom: -50px;
  right: -50px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(211, 47, 47, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffebee;
  color: var(--primary-dark);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 700;
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.badge-tag::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.5; }
}

.hero-title {
  font-size: 44px;
  font-weight: 900;
  color: #111827;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-title span {
  color: var(--primary);
  background: linear-gradient(135deg, #d32f2f, #e53935);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-btn-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.stat-item {
  background: #ffffff;
  padding: 20px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.stat-number {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* 通用模块样式 */
.section {
  padding: 80px 0;
  position: relative;
}

.section-alt {
  background-color: #fff9f9;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  color: #111827;
  margin-bottom: 14px;
}

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

/* 平台矩阵标签云 */
.platform-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 30px;
}

.model-pill {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition);
}

.model-pill:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-color: var(--primary);
  transform: scale(1.05);
}

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

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

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid #fce7e7;
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-dark);
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  color: #111827;
  margin-bottom: 12px;
}

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

/* 图文案例展示 */
.media-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.media-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.media-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #f3f4f6;
  overflow: hidden;
}

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

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

.media-card:hover .media-img-wrap img {
  transform: scale(1.04);
}

.media-body {
  padding: 20px;
}

.media-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 10px;
}

.media-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #111827;
}

.media-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* 对比评测表格与评分卡 */
.review-highlight {
  background: linear-gradient(135deg, #b71c1c, #d32f2f);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 30px;
  box-shadow: 0 10px 30px rgba(183, 28, 28, 0.25);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.review-info h3 {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 10px;
}

.review-info p {
  font-size: 15px;
  opacity: 0.92;
  max-width: 600px;
}

.review-score-box {
  display: flex;
  align-items: center;
  gap: 20px;
  background: rgba(255, 255, 255, 0.12);
  padding: 16px 28px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.score-num {
  font-size: 48px;
  font-weight: 900;
  line-height: 1;
  color: var(--accent-gold);
}

.score-meta {
  display: flex;
  flex-direction: column;
}

.score-stars {
  color: var(--accent-gold);
  font-size: 18px;
  letter-spacing: 2px;
}

.score-text {
  font-size: 13px;
  opacity: 0.85;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-md);
  background: #ffffff;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 700px;
}

.compare-table th,
.compare-table td {
  padding: 16px 20px;
  border-bottom: 1px solid #f3f4f6;
  font-size: 14px;
}

.compare-table th {
  background: #fef2f2;
  color: var(--primary-dark);
  font-weight: 700;
}

.compare-table td.brand-col {
  background: #fff8f8;
  font-weight: 700;
  color: var(--primary-dark);
}

.check-icon {
  color: #10b981;
  font-weight: 800;
}

.cross-icon {
  color: #ef4444;
  font-weight: 800;
}

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

.step-card {
  background: #ffffff;
  padding: 30px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  text-align: center;
  position: relative;
  transition: var(--transition);
}

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

.step-index {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-weight: 800;
  font-size: 18px;
  box-shadow: 0 4px 10px rgba(211, 47, 47, 0.3);
}

.step-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #111827;
}

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

/* 客户评论 */
.testimonial-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-quote {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  position: relative;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid #fce7e7;
  padding-top: 16px;
}

.user-avatar {
  width: 42px;
  height: 42px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
}

.user-name {
  font-size: 14px;
  font-weight: 700;
  color: #111827;
}

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

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

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 700;
  color: #111827;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-question:hover {
  background: #fef2f2;
  color: var(--primary-dark);
}

.faq-arrow {
  font-size: 18px;
  transition: transform 0.3s ease;
  color: var(--primary);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  background: #ffffff;
}

.faq-answer-inner {
  padding: 0 22px 20px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  border-top: 1px dashed #fce7e7;
  padding-top: 14px;
}

/* 表单与需求匹配 */
.form-wrapper {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
  max-width: 760px;
  margin: 0 auto;
}

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

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #111827;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid #e5e7eb;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-main);
  background: #fafafa;
  transition: var(--transition);
  font-family: inherit;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 110px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* 最新文章与资讯 */
.articles-box {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.article-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.article-item a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
  text-decoration: none;
  font-size: 14px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: #fffafa;
  border: 1px solid #fce7e7;
  transition: var(--transition);
}

.article-item a:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-color: var(--primary);
  transform: translateX(4px);
}

/* 友情链接与外部通道 */
.friend-links-box {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.friend-links-box a {
  display: inline-block;
  padding: 8px 16px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  transition: var(--transition);
}

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

/* 悬浮客服面板 */
.floating-contact {
  position: fixed;
  right: 20px;
  bottom: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.float-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 16px rgba(211, 47, 47, 0.4);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.float-btn:hover {
  transform: scale(1.1);
  background: var(--primary-dark);
}

.float-qr-pop {
  position: absolute;
  right: 60px;
  bottom: 0;
  width: 140px;
  background: #ffffff;
  padding: 10px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  display: none;
  text-align: center;
}

.float-qr-pop img {
  width: 100%;
  height: auto;
  display: block;
}

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

.float-btn:hover .float-qr-pop {
  display: block;
}

/* 页脚 */
.site-footer {
  background: #1a1515;
  color: #f3f4f6;
  padding: 60px 0 30px;
  border-top: 4px solid var(--primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h4 {
  color: #ffffff;
  font-size: 20px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-brand p {
  color: #9ca3af;
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 16px;
}

.footer-col h5 {
  color: #ffffff;
  font-size: 15px;
  margin-bottom: 16px;
  font-weight: 700;
  position: relative;
  padding-bottom: 8px;
}

.footer-col h5::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 2px;
  background: var(--primary);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: #9ca3af;
  text-decoration: none;
  font-size: 13px;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: #ffffff;
  padding-left: 4px;
}

.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #9ca3af;
  font-size: 13px;
  margin-bottom: 10px;
}

.footer-qr {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.footer-qr-card {
  width: 90px;
  text-align: center;
}

.footer-qr-card img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  background: #ffffff;
  padding: 2px;
}

.footer-qr-card span {
  display: block;
  font-size: 11px;
  color: #9ca3af;
  margin-top: 4px;
}

.footer-bottom {
  border-top: 1px solid #2d2626;
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: #9ca3af;
}

.footer-bottom a {
  color: #9ca3af;
  text-decoration: none;
}

.footer-bottom a:hover {
  color: #ffffff;
}

/* 响应式媒体查询 */
@media (max-width: 992px) {
  .hero-title { font-size: 36px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-container { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .menu-toggle { display: block; }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
  }
}

@media (max-width: 640px) {
  .hero-title { font-size: 28px; }
  .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
  .hero-stats-grid { grid-template-columns: 1fr; }
  .steps-container { grid-template-columns: 1fr; }
  .article-list { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .review-highlight { flex-direction: column; text-align: center; }
  .review-score-box { width: 100%; justify-content: center; }
}