/* ===== 重置与基础 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: #f4f6f9;
  color: #1a1a2e;
  transition: background 0.3s ease, color 0.3s ease;
  line-height: 1.6;
}
body.dark {
  background: #0f0f1a;
  color: #e0e0e0;
}
a {
  color: inherit;
  text-decoration: none;
}
ul {
  list-style: none;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 头部导航 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: background 0.3s ease, border-color 0.3s ease;
}
.dark .header {
  background: rgba(15, 15, 26, 0.8);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.logo {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, #e94560, #0f3460);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}
.nav {
  display: flex;
  gap: 28px;
  align-items: center;
}
.nav a {
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 0;
  position: relative;
  transition: color 0.3s ease;
  white-space: nowrap;
}
.nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2.5px;
  background: #e94560;
  border-radius: 2px;
  transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.nav a:hover::after,
.nav a.active::after {
  width: 100%;
}
.dark .nav a {
  color: #ccc;
}
.dark .nav a:hover {
  color: #fff;
}
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
  outline: none;
}
.menu-toggle span {
  display: block;
  width: 28px;
  height: 3px;
  background: #1a1a2e;
  border-radius: 3px;
  transition: all 0.3s ease;
}
.dark .menu-toggle span {
  background: #e0e0e0;
}
.dark-mode-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.4rem;
  padding: 5px 8px;
  color: #1a1a2e;
  transition: color 0.3s ease, transform 0.3s ease;
  line-height: 1;
}
.dark-mode-toggle:hover {
  transform: rotate(20deg);
}
.dark .dark-mode-toggle {
  color: #e0e0e0;
}

/* ===== Hero 区域 ===== */
.hero {
  position: relative;
  margin-top: 70px;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 100%);
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 70%, rgba(233, 69, 96, 0.12) 0%, transparent 50%),
              radial-gradient(circle at 70% 30%, rgba(15, 52, 96, 0.15) 0%, transparent 50%);
  animation: heroGlow 12s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(2%, 2%) scale(1.05); }
}
.hero .container {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 80px 20px;
}
.hero h1 {
  font-size: 3.6rem;
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 20px;
  text-shadow: 0 4px 40px rgba(0, 0, 0, 0.35);
  letter-spacing: -0.5px;
}
.hero h1 span {
  background: linear-gradient(135deg, #e94560, #ff6b6b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 700px;
  margin: 0 auto 40px;
  line-height: 1.7;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}
.hero .btn {
  display: inline-block;
  padding: 16px 52px;
  background: linear-gradient(135deg, #e94560, #d63852);
  color: #fff;
  border-radius: 60px;
  font-size: 1.1rem;
  font-weight: 700;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 8px 35px rgba(233, 69, 96, 0.4);
  border: none;
  cursor: pointer;
  letter-spacing: 0.5px;
}
.hero .btn:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 14px 50px rgba(233, 69, 96, 0.55);
}
.hero .banner-dots {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 14px;
  z-index: 3;
}
.hero .banner-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  cursor: pointer;
  transition: all 0.35s ease;
  border: 2px solid transparent;
}
.hero .banner-dots span.active {
  background: #e94560;
  transform: scale(1.2);
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 0 20px rgba(233, 69, 96, 0.5);
}

/* ===== 通用区块 ===== */
.section {
  padding: 100px 0;
}
.section-title {
  font-size: 2.6rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #1a1a2e, #0f3460);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}
.dark .section-title {
  background: linear-gradient(135deg, #e94560, #ff6b6b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  text-align: center;
  font-size: 1.1rem;
  color: #666;
  margin-bottom: 60px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}
.dark .section-subtitle {
  color: #aaa;
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}
.card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border-radius: 24px;
  padding: 32px 28px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.06);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(255, 255, 255, 0.25);
}
.card:hover {
  transform: translateY(-12px);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.1);
  border-color: rgba(233, 69, 96, 0.15);
}
.dark .card {
  background: rgba(30, 30, 60, 0.45);
  border-color: rgba(255, 255, 255, 0.06);
}
.dark .card:hover {
  border-color: rgba(233, 69, 96, 0.2);
}
.card .icon {
  margin-bottom: 20px;
  width: 60px;
  height: 60px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #e94560, #0f3460);
  flex-shrink: 0;
}
.card h3 {
  font-size: 1.45rem;
  margin-bottom: 12px;
  font-weight: 700;
}
.card p {
  color: #555;
  line-height: 1.7;
  font-size: 0.95rem;
}
.dark .card p {
  color: #bbb;
}

/* ===== 时间线 ===== */
.timeline {
  position: relative;
  padding-left: 40px;
  max-width: 800px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 18px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, #e94560, #0f3460);
  border-radius: 3px;
}
.timeline-item {
  position: relative;
  margin-bottom: 40px;
  padding-left: 30px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -14px;
  top: 6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #e94560;
  border: 4px solid #fff;
  box-shadow: 0 0 0 3px #e94560, 0 4px 15px rgba(233, 69, 96, 0.3);
  transition: transform 0.3s ease;
}
.timeline-item:hover::before {
  transform: scale(1.2);
}
.dark .timeline-item::before {
  border-color: #1a1a2e;
}
.timeline-item h4 {
  font-size: 1.25rem;
  margin-bottom: 6px;
  font-weight: 700;
}
.timeline-item span {
  font-size: 0.9rem;
  color: #999;
  font-weight: 500;
}
.timeline-item p {
  margin-top: 8px;
  color: #555;
  line-height: 1.7;
  font-size: 0.95rem;
}
.dark .timeline-item p {
  color: #bbb;
}

/* ===== 团队卡片 ===== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
}
.team-card {
  text-align: center;
  padding: 32px 20px 28px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border-radius: 24px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.06);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.team-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}
.dark .team-card {
  background: rgba(30, 30, 60, 0.45);
  border-color: rgba(255, 255, 255, 0.06);
}
.team-card .avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, #e94560, #0f3460);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  color: #fff;
  font-weight: 700;
  box-shadow: 0 8px 30px rgba(233, 69, 96, 0.25);
  transition: transform 0.3s ease;
}
.team-card:hover .avatar {
  transform: scale(1.05);
}
.team-card h4 {
  font-size: 1.2rem;
  margin-bottom: 4px;
  font-weight: 700;
}
.team-card span {
  font-size: 0.9rem;
  color: #e94560;
  font-weight: 600;
}
.team-card p {
  margin-top: 10px;
  color: #666;
  font-size: 0.9rem;
  line-height: 1.6;
}
.dark .team-card p {
  color: #aaa;
}

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  padding: 20px 0;
  cursor: pointer;
  transition: background 0.2s ease;
  border-radius: 12px;
  padding-left: 16px;
  padding-right: 16px;
}
.faq-item:hover {
  background: rgba(233, 69, 96, 0.03);
}
.dark .faq-item {
  border-color: rgba(255, 255, 255, 0.06);
}
.dark .faq-item:hover {
  background: rgba(233, 69, 96, 0.05);
}
.faq-item .question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.05rem;
  font-weight: 600;
  padding: 8px 0;
  gap: 16px;
}
.faq-item .question .arrow {
  transition: transform 0.35s ease;
  font-size: 1.1rem;
  flex-shrink: 0;
  color: #e94560;
}
.faq-item.active .question .arrow {
  transform: rotate(180deg);
}
.faq-item .answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s ease, padding 0.35s ease;
  opacity: 0;
  color: #555;
  line-height: 1.7;
  font-size: 0.95rem;
}
.dark .faq-item .answer {
  color: #bbb;
}
.faq-item.active .answer {
  max-height: 500px;
  opacity: 1;
  padding-bottom: 16px;
  padding-top: 4px;
}

/* ===== 联系信息 ===== */
.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.contact-info .item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 20px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(12px) saturate(150%);
  -webkit-backdrop-filter: blur(12px) saturate(150%);
  border-radius: 20px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.contact-info .item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}
.dark .contact-info .item {
  background: rgba(30, 30, 60, 0.45);
  border-color: rgba(255, 255, 255, 0.06);
}
.contact-info .item .icon {
  width: 50px;
  height: 50px;
  border-radius: 16px;
  background: linear-gradient(135deg, #e94560, #0f3460);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
  font-size: 1.4rem;
}
.contact-info .item h4 {
  font-size: 1rem;
  margin-bottom: 4px;
  font-weight: 600;
}
.contact-info .item p {
  font-size: 0.9rem;
  color: #666;
  line-height: 1.4;
}
.dark .contact-info .item p {
  color: #aaa;
}

/* ===== 地图占位 ===== */
.map-placeholder {
  width: 100%;
  height: 350px;
  border-radius: 24px;
  background: rgba(0, 0, 0, 0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #999;
  margin-top: 30px;
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.04);
  transition: background 0.3s ease;
}
.dark .map-placeholder {
  background: rgba(255, 255, 255, 0.03);
  color: #666;
  border-color: rgba(255, 255, 255, 0.04);
}

/* ===== 页脚 ===== */
.footer {
  background: #1a1a2e;
  color: #ccc;
  padding: 60px 0 30px;
}
.footer .container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 40px;
}
.footer h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 20px;
  font-weight: 700;
}
.footer a {
  display: block;
  color: #aaa;
  margin-bottom: 10px;
  font-size: 0.9rem;
  transition: color 0.3s ease, padding-left 0.3s ease;
}
.footer a:hover {
  color: #e94560;
  padding-left: 4px;
}
.footer .copyright {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: 20px;
  font-size: 0.85rem;
}
.footer .copyright a {
  display: inline;
  margin: 0 6px;
  color: #aaa;
}
.footer .copyright a:hover {
  color: #e94560;
  padding-left: 0;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e94560, #d63852);
  color: #fff;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  box-shadow: 0 6px 25px rgba(233, 69, 96, 0.35);
  opacity: 0;
  transform: translateY(20px) scale(0.9);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}
.back-to-top:hover {
  transform: translateY(-6px) scale(1.05);
  box-shadow: 0 12px 40px rgba(233, 69, 96, 0.5);
}

/* ===== 搜索模态框 ===== */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.search-modal.active {
  display: flex;
}
.search-modal .search-box {
  background: #fff;
  border-radius: 24px;
  padding: 32px 28px;
  width: 90%;
  max-width: 520px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.25);
  animation: modalIn 0.3s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.dark .search-modal .search-box {
  background: #1a1a2e;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
}
.search-modal input {
  width: 100%;
  padding: 16px 20px;
  border: 2px solid #eee;
  border-radius: 14px;
  font-size: 1.05rem;
  outline: none;
  transition: border 0.3s ease, box-shadow 0.3s ease;
  background: #fafafa;
}
.search-modal input:focus {
  border-color: #e94560;
  box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.1);
}
.dark .search-modal input {
  background: #0f0f1a;
  border-color: #333;
  color: #fff;
}
.dark .search-modal input:focus {
  border-color: #e94560;
  box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.15);
}
.search-modal .close-btn {
  display: block;
  margin-top: 20px;
  text-align: center;
  color: #e94560;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: opacity 0.3s ease;
}
.search-modal .close-btn:hover {
  opacity: 0.8;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 20px 0;
  font-size: 0.9rem;
  color: #888;
}
.breadcrumb a {
  color: #e94560;
  font-weight: 500;
}
.breadcrumb span {
  margin: 0 8px;
  color: #bbb;
}

/* ===== 文章列表 ===== */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}
.article-card {
  padding: 28px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border-radius: 20px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.article-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.08);
}
.dark .article-card {
  background: rgba(30, 30, 60, 0.45);
  border-color: rgba(255, 255, 255, 0.06);
}
.article-card .date {
  font-size: 0.85rem;
  color: #999;
  margin-bottom: 8px;
  font-weight: 500;
}
.article-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  font-weight: 700;
  line-height: 1.4;
}
.article-card p {
  color: #555;
  line-height: 1.7;
  margin-bottom: 15px;
  font-size: 0.95rem;
}
.dark .article-card p {
  color: #bbb;
}
.article-card .read-more {
  color: #e94560;
  font-weight: 600;
  cursor: pointer;
  display: inline-block;
  transition: gap 0.3s ease;
  font-size: 0.95rem;
}
.article-card .read-more:hover {
  text-decoration: underline;
}

/* ===== 教程区 ===== */
.howto-section {
  padding: 32px 30px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border-radius: 24px;
  margin-top: 30px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.dark .howto-section {
  background: rgba(30, 30, 60, 0.45);
  border-color: rgba(255, 255, 255, 0.06);
}
.howto-section h3 {
  margin-bottom: 20px;
  font-size: 1.6rem;
  font-weight: 700;
}
.howto-section h4 {
  font-size: 1.15rem;
  margin-top: 24px;
  margin-bottom: 12px;
  font-weight: 600;
  color: #e94560;
}
.howto-section ol {
  padding-left: 24px;
  margin-bottom: 20px;
}
.howto-section ol li {
  margin-bottom: 12px;
  line-height: 1.7;
  font-size: 0.95rem;
}
.howto-section ul {
  padding-left: 24px;
  margin-bottom: 20px;
}
.howto-section ul li {
  margin-bottom: 8px;
  line-height: 1.7;
  font-size: 0.95rem;
  list-style-type: disc;
}
.howto-section p {
  line-height: 1.7;
  margin-bottom: 15px;
  font-size: 0.95rem;
}

/* ===== 合作伙伴 ===== */
.partner-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  justify-content: center;
  align-items: center;
  padding: 30px 0;
}
.partner-logos .logo-item {
  width: 120px;
  height: 60px;
  background: rgba(0, 0, 0, 0.03);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: #999;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  font-weight: 600;
}
.dark .partner-logos .logo-item {
  background: rgba(255, 255, 255, 0.03);
  color: #666;
}
.partner-logos .logo-item:hover {
  background: rgba(233, 69, 96, 0.06);
  color: #e94560;
  border-color: rgba(233, 69, 96, 0.15);
  transform: scale(1.05);
}

/* ===== 统计数据 ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 30px;
  text-align: center;
  padding: 40px 0;
}
.stats-grid .stat h2 {
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, #e94560, #0f3460);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stats-grid .stat p {
  color: #888;
  font-size: 1rem;
  margin-top: 6px;
  font-weight: 500;
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.8rem;
  }
  .section-title {
    font-size: 2.2rem;
  }
  .nav {
    gap: 20px;
  }
  .nav a {
    font-size: 0.9rem;
  }
}
@media (max-width: 768px) {
  .nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    padding: 20px 24px;
    gap: 12px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
  }
  .dark .nav {
    background: rgba(15, 15, 26, 0.92);
    border-bottom-color: rgba(255, 255, 255, 0.05);
  }
  .nav.open {
    display: flex;
  }
  .nav a {
    padding: 10px 0;
    font-size: 1rem;
  }
  .menu-toggle {
    display: flex;
  }
  .hero {
    min-height: 70vh;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .section {
    padding: 60px 0;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-info {
    grid-template-columns: 1fr;
  }
  .footer .container {
    grid-template-columns: 1fr 1fr;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid .stat h2 {
    font-size: 2.2rem;
  }
  .hero .btn {
    padding: 14px 38px;
    font-size: 1rem;
  }
  .timeline {
    padding-left: 30px;
  }
  .timeline::before {
    left: 12px;
  }
  .timeline-item {
    padding-left: 20px;
  }
  .timeline-item::before {
    left: -10px;
    width: 16px;
    height: 16px;
  }
  .article-list {
    grid-template-columns: 1fr;
  }
  .back-to-top {
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
    bottom: 20px;
    right: 20px;
  }
}
@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .team-grid {
    grid-template-columns: 1fr;
  }
  .container {
    padding: 0 16px;
  }
  .footer .container {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .stats-grid .stat h2 {
    font-size: 1.8rem;
  }
  .card {
    padding: 24px 20px;
  }
  .hero .btn {
    padding: 12px 30px;
    font-size: 0.95rem;
  }
  .search-modal .search-box {
    padding: 24px 20px;
  }
  .howto-section {
    padding: 24px 18px;
  }
  .partner-logos .logo-item {
    width: 100px;
    height: 50px;
    font-size: 0.8rem;
  }
}