/* /static/css/pages.css - 页面特有样式 */

/* ========== 首页样式 ========== */
.hero-section {
  background: linear-gradient(135deg, #ff3b30 0%, #ee1c25 50%, #d4000a 100%);
  background-size: 400% 400%;
  animation: gradientShift 8s ease infinite;
  color: white;
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--navbar-height);
  overflow: hidden;
  padding: 60px 0;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.05)"/><circle cx="20" cy="20" r="1" fill="rgba(255,255,255,0.03)"/><circle cx="80" cy="80" r="1.5" fill="rgba(255,255,255,0.03)"/></svg>');
  background-size: 200px 200px;
  opacity: 0.3;
  z-index: 1;
}

.hero-container {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
  width: 100%;
}

.hero-left {
  flex: 1;
  max-width: 55%;
  animation: fadeInLeft 1s ease-out;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.8rem);
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.2;
  color: #ffffff;
  text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  margin-bottom: 25px;
  color: #ffc107;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  font-weight: 600;
}

.hero-description {
  font-size: 1.1rem;
  margin-bottom: 35px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.hero-right {
  flex: 1;
  max-width: 45%;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeInRight 1s ease-out 0.5s both;
}

.animation-container {
  position: relative;
  width: 100%;
  max-width: 500px;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pdd-animation {
  width: 100%;
  height: 100%;
  position: relative;
}

.rotating-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 340px;
  height: 340px;
  border: 3px dashed rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  animation: rotateSlow 30s linear infinite;
}

.rotating-circle::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 50%;
  width: 20px;
  height: 20px;
  background: #ffc107;
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 20px #ffc107;
}

.orbit-icon {
  position: absolute;
  width: 60px;
  height: 60px;
  background: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.6rem;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  animation: float3D 6s ease-in-out infinite;
  z-index: 2;
}

.icon-orbit-1 {
  top: 15px;
  left: 50%;
  transform: translateX(-50%);
  animation-delay: 0s;
}

.icon-orbit-2 {
  top: 35%;
  right: 18%;
  transform: translateY(-50%);
  animation-delay: 0.6s;
}

.icon-orbit-3 {
  top: 50%;
  right: 15px;
  transform: translateY(-50%);
  animation-delay: 1.2s;
}

.icon-orbit-4 {
  bottom: 35%;
  right: 18%;
  transform: translateY(50%);
  animation-delay: 1.8s;
}

.icon-orbit-5 {
  bottom: 15px;
  left: 50%;
  transform: translateX(-50%);
  animation-delay: 2.4s;
}

.icon-orbit-6 {
  bottom: 35%;
  left: 18%;
  transform: translateY(50%);
  animation-delay: 3.0s;
}

.icon-orbit-7 {
  top: 50%;
  left: 15px;
  transform: translateY(-50%);
  animation-delay: 3.6s;
}

.icon-orbit-8 {
  top: 35%;
  left: 18%;
  transform: translateY(-50%);
  animation-delay: 4.2s;
}

.center-main {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 130px;
  height: 130px;
  background: linear-gradient(135deg, #ffc107, #ff9800);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 3.2rem;
  z-index: 3;
  box-shadow: 
    0 0 0 15px rgba(255, 255, 255, 0.1),
    0 0 0 30px rgba(255, 255, 255, 0.05),
    0 15px 30px rgba(0, 0, 0, 0.3);
  animation: pulseGlow 2s ease-in-out infinite;
}

.bg-element {
  position: absolute;
  border-radius: 50%;
  opacity: 0.1;
  z-index: 1;
}

.bg-1 {
  width: 100px;
  height: 100px;
  background: #ffc107;
  top: 50px;
  left: 50px;
  animation: float 8s ease-in-out infinite;
}

.bg-2 {
  width: 150px;
  height: 150px;
  background: #ee1c25;
  bottom: 50px;
  right: 50px;
  animation: float 10s ease-in-out infinite reverse;
}

.bg-3 {
  width: 80px;
  height: 80px;
  background: #4caf50;
  top: 100px;
  right: 100px;
  animation: float 12s ease-in-out infinite;
}

/* ========== 修复的按钮样式 ========== */
.cta-buttons {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.cta-btn {
  background: linear-gradient(135deg, #ffd700, #ff9800) !important;
  color: #1a1a1a !important;
  padding: 14px 32px !important;
  border-radius: 50px !important;
  text-decoration: none !important;
  font-weight: 800 !important;
  font-size: 1.1rem !important;
  transition: var(--transition) !important;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3) !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 10px !important;
  min-width: 200px !important;
  justify-content: center !important;
  border: 2px solid rgba(255, 255, 255, 0.5) !important;
  position: relative !important;
  overflow: hidden !important;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2) !important;
  letter-spacing: 0.5px !important;
}

.cta-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  transition: left 0.6s ease;
}

.cta-btn:hover::before {
  left: 100%;
}

.cta-btn:hover {
  transform: translateY(-5px) scale(1.05) !important;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4) !important;
  color: #1a1a1a !important;
  text-decoration: none !important;
  border-color: white !important;
  background: linear-gradient(135deg, #ffe043, #ffa726) !important;
}

.cta-btn.primary {
  background: linear-gradient(135deg, #ffffff, #e8e8e8) !important;
  color: #d4000a !important;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25) !important;
  border: 2px solid white !important;
}

.cta-btn.primary:hover {
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.35) !important;
  color: #d4000a !important;
  background: linear-gradient(135deg, white, #f0f0f0) !important;
  border-color: white !important;
}

.cta-btn.secondary {
  background: linear-gradient(135deg, #00c853, #00b248) !important;
  color: white !important;
  box-shadow: 0 10px 25px rgba(0, 200, 83, 0.4) !important;
  border: 2px solid rgba(255, 255, 255, 0.4) !important;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3) !important;
}

.cta-btn.secondary:hover {
  box-shadow: 0 15px 35px rgba(0, 200, 83, 0.5) !important;
  color: white !important;
  background: linear-gradient(135deg, #00e676, #00c853) !important;
  border-color: rgba(255, 255, 255, 0.6) !important;
}

/* 移动端按钮优化 */
@media (max-width: 768px) {
  .cta-buttons {
    flex-direction: column;
    align-items: center;
    gap: 15px;
  }
  
  .cta-btn {
    width: 100%;
    max-width: 280px;
    padding: 14px 20px !important;
    font-size: 1rem !important;
    font-weight: 700 !important;
  }
  
  .cta-btn:hover {
    transform: translateY(-3px) scale(1.03) !important;
  }
}

/* 小屏幕手机端优化 */
@media (max-width: 480px) {
  .cta-btn {
    padding: 12px 18px !important;
    font-size: 0.95rem !important;
    min-width: auto;
  }
}

/* 活动卡片区域 */
.activities-section {
  background: white;
  padding: 80px 0;
  position: relative;
}

.activities-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(238, 28, 37, 0.02) 0%, rgba(255, 193, 7, 0.02) 100%);
  pointer-events: none;
  z-index: 1;
}

.activity-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
  margin-top: 40px;
  position: relative;
  z-index: 2;
}

.activity-card {
  background: white;
  border-radius: var(--radius);
  padding: 22px 18px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid rgba(0,0,0,0.05);
  box-shadow: var(--card-shadow);
  position: relative;
  overflow: hidden;
  z-index: 3;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 180px;
}

.activity-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--hover-shadow);
  border-color: var(--primary);
}

.activity-icon {
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  color: white;
  font-size: 1.9rem;
  transition: var(--transition);
}

/* 修改活动图标为CSS图标 */
.activity-icon i.icon {
  width: 35px;
  height: 35px;
  background-color: white;
  display: inline-block;
}

.activity-card:hover .activity-icon {
  transform: scale(1.1) rotate(10deg);
  background: linear-gradient(135deg, var(--secondary), #ff9800);
}

.activity-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
  line-height: 1.3;
}

.activity-desc {
  font-size: 0.95rem;
  color: var(--gray);
  line-height: 1.5;
  margin: 0;
}

/* 特色区域 */
.features-section {
    background: white;
    padding: 80px 0;
    position: relative;
}

.features-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(238, 28, 37, 0.02) 0%, rgba(255, 193, 7, 0.02) 100%);
  pointer-events: none;
  z-index: 1;
}

.feature-card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    height: 100%;
    border: 1px solid rgba(0,0,0,0.05);
    padding: 1.8rem 1.2rem !important;
    text-align: center;
    position: relative;
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 220px;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--hover-shadow);
    border-color: var(--primary);
}

.feature-image-container {
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.2rem;
    transition: var(--transition);
}

.feature-card:hover .feature-image-container {
    transform: scale(1.1);
}

.feature-img {
    width: 85px;
    height: 85px;
    object-fit: contain;
    transition: var(--transition);
    border-radius: 15px;
}

.feature-card:hover .feature-img {
    transform: scale(1.1);
}

.feature-card p {
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0;
    text-align: center;
    color: var(--gray);
    padding: 0 10px;
}

/* 排名区域 */
.ranking-section {
    background: #f8f9fa;
    padding: 80px 0;
}

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

.ranking-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.ranking-column {
    display: flex;
    flex-direction: column;
}

.ranking-column:first-child {
    border-right: 1px solid rgba(0,0,0,0.05);
}

.ranking-item {
    display: flex;
    align-items: center;
    padding: 0 15px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
    position: relative;
    height: 90px;
    gap: 12px;
    background: white;
}

.ranking-column:last-child .ranking-item:last-child,
.ranking-column:first-child .ranking-item:last-child {
    border-bottom: none;
}

.ranking-item:hover {
    background: rgba(238, 28, 37, 0.03);
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.ranking-number {
    font-size: 1.5rem;
    font-weight: 800;
    min-width: 45px;
    text-align: center;
    position: relative;
    flex-shrink: 0;
    padding-right: 10px;
}

.ranking-number::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 40px;
    border-radius: 1px;
}

.ranking-number.top-1 { color: #ee1c25; }
.ranking-number.top-1::after { background: linear-gradient(180deg, #ee1c25, #ff4d55); }

.ranking-number.top-2 { color: #ff5722; }
.ranking-number.top-2::after { background: linear-gradient(180deg, #ff5722, #ff8a65); }

.ranking-number.top-3 { color: #ff9800; }
.ranking-number.top-3::after { background: linear-gradient(180deg, #ff9800, #ffb74d); }

.ranking-number.top-4 { color: #ffc107; }
.ranking-number.top-4::after { background: linear-gradient(180deg, #ffc107, #ffd54f); }

.ranking-number.top-5 { color: #4caf50; }
.ranking-number.top-5::after { background: linear-gradient(180deg, #4caf50, #81c784); }

.ranking-number.top-6 { color: #2196f3; }
.ranking-number.top-6::after { background: linear-gradient(180deg, #2196f3, #64b5f6); }

.ranking-number.top-7 { color: #9c27b0; }
.ranking-number.top-7::after { background: linear-gradient(180deg, #9c27b0, #ba68c8); }

.ranking-number.top-8 { color: #795548; }
.ranking-number.top-8::after { background: linear-gradient(180deg, #795548, #a1887f); }

.ranking-number.top-9 { color: #607d8b; }
.ranking-number.top-9::after { background: linear-gradient(180deg, #607d8b, #90a4ae); }

.ranking-number.top-10 { color: #009688; }
.ranking-number.top-10::after { background: linear-gradient(180deg, #009688, #4db6ac); }

.ranking-number.default { color: var(--primary); }
.ranking-number.default::after { background: linear-gradient(180deg, var(--primary), var(--secondary)); }

.ranking-title-wrapper {
    flex: 1;
    min-width: 0;
    position: relative;
    display: flex;
    align-items: center;
    height: 100%;
}

.ranking-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark);
    text-decoration: none;
    line-height: 1.4;
    transition: var(--transition);
    
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    
    max-height: 2.8em;
    width: 100%;
}

.ranking-title:hover {
    color: var(--primary);
    text-decoration: none;
}

/* ========== 分类页样式 ========== */
.category-page {
    background: #f8f9fa;
    min-height: 100vh;
    margin-top: var(--navbar-height); /* 修改这里：使用margin-top而不是padding-top */
    padding-top: 30px; /* 适当的内边距 */
}

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

.category-header {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--card-shadow);
    padding: 40px;
    margin-bottom: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.category-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.category-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 15px;
    color: var(--dark);
}

.category-description {
    color: var(--gray);
    margin-bottom: 20px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.category-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 25px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    display: block;
}

.stat-label {
    color: var(--gray);
    font-size: 0.95rem;
}

.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.article-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 25px;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--hover-shadow);
}

.article-body {
    padding: 0;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.category-badge {
    display: inline-block;
    margin-bottom: 15px;
}

.category-badge .badge {
    background: var(--primary);
    color: white;
    font-size: 0.8rem;
    padding: 4px 12px;
    border-radius: 20px;
}

.article-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.4;
}

.article-title a {
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
}

.article-title a:hover {
    color: var(--primary);
}

.article-excerpt {
    color: var(--gray);
    margin-bottom: 20px;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.6;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 15px;
    border-top: 1px solid rgba(0,0,0,0.05);
    font-size: 0.9rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--gray);
}

.meta-item i.icon {
    color: var(--primary);
}

.pagination-container {
    margin-top: 50px;
    display: flex;
    justify-content: center;
}

.pagination {
    display: flex;
    gap: 5px;
}

.page-item {
    margin: 0 2px;
}

.page-link {
    background: white;
    color: var(--primary);
    border: 1px solid var(--border);
    padding: 10px 15px;
    border-radius: 5px;
    transition: var(--transition);
    font-weight: 500;
}

.page-link:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.page-item.active .page-link {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.page-item.disabled .page-link {
    background: #f8f9fa;
    color: var(--gray);
    cursor: not-allowed;
}

/* 动画定义 */
@keyframes fadeInRanking {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ranking-item {
    animation: fadeInRanking 0.6s ease-out;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes rotateSlow {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes float3D {
  0%, 100% { 
    transform: translateY(0) rotate(0deg) scale(1); 
  }
  50% { 
    transform: translateY(-20px) rotate(10deg) scale(1.1); 
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

@keyframes pulseGlow {
  0%, 100% { 
    transform: translate(-50%, -50%) scale(1);
    box-shadow: 
      0 0 0 15px rgba(255, 255, 255, 0.1),
      0 0 0 30px rgba(255, 255, 255, 0.05),
      0 15px 30px rgba(0, 0, 0, 0.3);
  }
  50% { 
    transform: translate(-50%, -50%) scale(1.05);
    box-shadow: 
      0 0 0 20px rgba(255, 255, 255, 0.15),
      0 0 0 40px rgba(255, 255, 255, 0.08),
      0 20px 40px rgba(0, 0, 0, 0.4);
  }
}

/* 响应式设计 */
@media (max-width: 992px) {
  .hero-container {
    flex-direction: column;
    gap: 40px;
    padding: 0 30px;
  }
  
  .hero-left {
    max-width: 100%;
    text-align: center;
    order: 1;
  }
  
  .hero-right {
    max-width: 100%;
    order: 2;
  }
  
  .cta-buttons {
    justify-content: center;
  }
  
  .animation-container {
    max-width: 400px;
  }
  
  .rotating-circle {
    width: 280px;
    height: 280px;
  }
  
  .center-main {
    width: 100px;
    height: 100px;
    font-size: 2.5rem;
  }
  
  .orbit-icon {
    width: 45px;
    height: 45px;
    font-size: 1.3rem;
  }
  
  .activity-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  
  .category-header {
    padding: 30px 20px;
  }
  
  .category-title {
    font-size: 2.2rem;
  }
  
  .category-stats {
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .hero-section {
    min-height: 60vh;
    padding: 40px 0;
  }
  
  .hero-container {
    padding: 0 20px;
    gap: 30px;
  }
  
  .hero-left {
    max-width: 100%;
    text-align: center;
    order: 1;
  }
  
  .hero-right {
    display: none;
  }
  
  .hero-title {
    font-size: 2.2rem;
    margin-bottom: 15px;
  }
  
  .hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 20px;
  }
  
  .hero-description {
    font-size: 1rem;
    margin-bottom: 25px;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
    gap: 15px;
  }
  
  .cta-btn {
    width: 100%;
    max-width: 280px;
    padding: 14px 20px !important;
    font-size: 1rem !important;
  }
  
  .activity-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
  }
  
  .activity-card {
    padding: 16px 12px;
    min-height: 160px;
  }
  
  .activity-icon {
    width: 55px;
    height: 55px;
    font-size: 1.5rem;
    margin-bottom: 10px;
  }
  
  .activity-icon i.icon {
    width: 30px;
    height: 30px;
  }
  
  .activity-name {
    font-size: 1rem;
    margin-bottom: 5px;
  }
  
  .activity-desc {
    font-size: 0.85rem;
    line-height: 1.4;
  }
  
  .features-section {
    padding: 50px 0;
  }
  
  .features-section .row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin: 0;
  }
  
  .features-section .col-lg-3.col-md-6 {
    width: 100%;
    padding: 0;
    flex: none;
  }
  
  .feature-card {
    padding: 1.2rem 0.8rem !important;
    min-height: 150px;
    height: 100%;
  }
  
  .feature-image-container {
    width: 70px;
    height: 70px;
    margin-bottom: 0.8rem;
  }
  
  .feature-img {
    width: 60px;
    height: 60px;
    border-radius: 12px;
  }
  
  .feature-card p {
    font-size: 0.8rem;
    line-height: 1.4;
    padding: 0 5px;
  }
  
  .ranking-list {
    grid-template-columns: 1fr;
  }
  
  .ranking-column:first-child {
    border-right: none;
  }
  
  .ranking-item {
    padding: 0 12px;
    height: 70px;
    gap: 8px;
  }
  
  .ranking-number {
    font-size: 1.1rem;
    min-width: 35px;
    padding-right: 8px;
  }
  
  .ranking-number::after {
    height: 30px;
  }
  
  .ranking-title {
    font-size: 0.9rem;
    -webkit-line-clamp: 2;
    max-height: 2.6em;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .category-header {
    padding: 25px 15px;
  }
  
  .category-title {
    font-size: 1.8rem;
  }
  
  .category-stats {
    flex-wrap: wrap;
    gap: 20px;
  }
  
  .stat-item {
    flex: 1 1 45%;
    min-width: 120px;
  }
  
  .pagination {
    flex-wrap: wrap;
  }
  
  .article-excerpt {
    display: none;
  }
  
  .article-title {
    font-size: 1.1rem;
    margin-bottom: 10px;
  }
  
  .article-card {
    padding: 20px;
  }
  
  /* 修改这里：分类页面的移动端边距 */
  .category-page {
    margin-top: var(--navbar-height);
    padding-top: 20px;
  }
}

@media (max-width: 480px) {
  .hero-section {
    padding: 40px 0;
  }
  
  .hero-title {
    font-size: 1.8rem;
  }
  
  .hero-subtitle {
    font-size: 1.3rem;
  }
  
  .cta-btn {
    padding: 12px 20px !important;
    font-size: 0.95rem !important;
    min-width: auto;
  }
  
  .activity-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  
  .activity-card {
    padding: 14px 10px;
    min-height: 150px;
  }
  
  .activity-icon {
    width: 50px;
    height: 50px;
    font-size: 1.3rem;
    margin-bottom: 8px;
  }
  
  .activity-icon i.icon {
    width: 25px;
    height: 25px;
  }
  
  .activity-name {
    font-size: 0.95rem;
  }
  
  .activity-desc {
    font-size: 0.8rem;
  }
  
  .features-section {
    padding: 40px 0;
  }
  
  .features-section .row {
    gap: 10px;
  }
  
  .feature-card {
    padding: 1rem 0.6rem !important;
    min-height: 140px;
  }
  
  .feature-image-container {
    width: 60px;
    height: 60px;
    margin-bottom: 0.6rem;
  }
  
  .feature-img {
    width: 50px;
    height: 50px;
    border-radius: 8px;
  }
  
  .feature-card p {
    font-size: 0.75rem;
    line-height: 1.3;
  }
  
  .ranking-item {
    padding: 0 10px;
    height: 65px;
    gap: 6px;
  }
  
  .ranking-number {
    font-size: 1rem;
    min-width: 30px;
    padding-right: 6px;
  }
  
  .ranking-title {
    font-size: 0.85rem;
  }
  
  .category-header {
    padding: 20px 10px;
  }
  
  .category-title {
    font-size: 1.5rem;
  }
  
  .article-body {
    padding: 0;
  }
  
  .article-card {
    padding: 15px;
  }
}