/* ========================================
   每日大赛 - 全局样式表
   现代极简高端风格
   ======================================== */

/* 1. 基础样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: #1f2937;
  background-color: #ffffff;
  font-size: 16px;
}

/* 2. 排版系统 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  color: #1f2937;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
  color: #4b5563;
  line-height: 1.8;
}

a {
  color: #2563eb;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #1d4ed8;
}

/* 3. 容器与布局 */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
}

.section {
  padding: 4rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  margin-bottom: 0.5rem;
}

.section-title p {
  font-size: 1.1rem;
  color: #6b7280;
}

/* 4. 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: #ffffff;
  border-bottom: 1px solid #f3f4f6;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

.navbar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.navbar-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #2563eb;
  letter-spacing: -0.02em;
}

.navbar-menu {
  display: flex;
  gap: 2rem;
  align-items: center;
  list-style: none;
}

.navbar-menu a {
  color: #4b5563;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.3s ease;
}

.navbar-menu a:hover {
  color: #2563eb;
}

.navbar-cta {
  background-color: #2563eb;
  color: #ffffff;
  padding: 0.6rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.navbar-cta:hover {
  background-color: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

@media (max-width: 768px) {
  .navbar-menu {
    gap: 1rem;
  }

  .navbar-menu a {
    font-size: 0.85rem;
  }

  .navbar-cta {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
}

/* 5. 搜索框 */
.search-bar {
  display: flex;
  align-items: center;
  background-color: #f3f4f6;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  border: 1px solid #e5e7eb;
  transition: all 0.3s ease;
}

.search-bar:focus-within {
  background-color: #ffffff;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-bar input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.95rem;
  color: #1f2937;
}

.search-bar input::placeholder {
  color: #9ca3af;
}

.search-icon {
  color: #9ca3af;
  margin-right: 0.5rem;
  cursor: pointer;
}

/* 6. Hero Section */
.hero {
  margin-top: 70px;
  background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
  padding: 4rem 0;
  position: relative;
  overflow: hidden;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-text h1 {
  margin-bottom: 1rem;
  font-size: 2.8rem;
  color: #1f2937;
}

.hero-text p {
  font-size: 1.1rem;
  color: #6b7280;
  margin-bottom: 1.5rem;
}

.hero-text .description {
  font-size: 1rem;
  color: #9ca3af;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  padding: 0.75rem 2rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background-color: #2563eb;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  background-color: #f3f4f6;
  color: #1f2937;
  border: 1px solid #e5e7eb;
}

.btn-secondary:hover {
  background-color: #e5e7eb;
  transform: translateY(-2px);
}

.hero-image {
  position: relative;
  height: 400px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
  }

  .hero-text h1 {
    font-size: 2rem;
  }

  .hero-image {
    height: 300px;
  }
}

/* 7. 品牌介绍 */
.intro-section {
  background-color: #f9fafb;
  padding: 3rem 0;
}

.intro-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.intro-text h2 {
  margin-bottom: 1rem;
}

.intro-text p {
  margin-bottom: 1.5rem;
  color: #6b7280;
}

.intro-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.stat-item {
  text-align: center;
  padding: 1.5rem;
  background-color: #ffffff;
  border-radius: 8px;
  border: 1px solid #e5e7eb;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: #2563eb;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.95rem;
  color: #6b7280;
}

@media (max-width: 768px) {
  .intro-content {
    grid-template-columns: 1fr;
  }

  .intro-stats {
    grid-template-columns: 1fr;
  }
}

/* 8. 热门话题卡片 */
.topics-section {
  padding: 4rem 0;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.topic-card {
  background-color: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #e5e7eb;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
  border-color: #d1d5db;
}

.topic-thumbnail {
  position: relative;
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
  overflow: hidden;
}

.topic-thumbnail video,
.topic-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topic-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background-color: rgba(37, 99, 235, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all 0.3s ease;
  cursor: pointer;
}

.topic-play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 12px solid #ffffff;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  margin-left: 3px;
}

.topic-card:hover .topic-play-btn {
  opacity: 1;
}

.topic-content {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.topic-category {
  display: inline-block;
  background-color: #dbeafe;
  color: #1e40af;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  width: fit-content;
}

.topic-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1f2937;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.topic-description {
  font-size: 0.9rem;
  color: #9ca3af;
  margin-bottom: 1rem;
  flex: 1;
}

.topic-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: #9ca3af;
  padding-top: 1rem;
  border-top: 1px solid #f3f4f6;
}

.topic-meta-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.topic-author {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid #f3f4f6;
}

.topic-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: #dbeafe;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: #1e40af;
}

.topic-author-name {
  font-size: 0.85rem;
  color: #6b7280;
}

/* 9. 板块分类 */
.categories-section {
  background-color: #f9fafb;
  padding: 4rem 0;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.category-card {
  background-color: #ffffff;
  padding: 2rem;
  border-radius: 8px;
  text-align: center;
  border: 1px solid #e5e7eb;
  transition: all 0.3s ease;
  cursor: pointer;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
  border-color: #2563eb;
}

.category-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.category-name {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1f2937;
  margin-bottom: 0.5rem;
}

.category-description {
  font-size: 0.9rem;
  color: #6b7280;
  margin-bottom: 1rem;
}

.category-count {
  font-size: 0.85rem;
  color: #2563eb;
  font-weight: 600;
}

/* 10. 社区实力 */
.stats-section {
  padding: 4rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.stat-card {
  background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
  padding: 2rem;
  border-radius: 8px;
  border: 1px solid #e5e7eb;
  text-align: center;
}

.stat-card-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: #2563eb;
  margin-bottom: 0.5rem;
}

.stat-card-label {
  font-size: 1rem;
  font-weight: 600;
  color: #1f2937;
  margin-bottom: 0.5rem;
}

.stat-card-desc {
  font-size: 0.9rem;
  color: #6b7280;
}

/* 11. 用户评价 */
.testimonials-section {
  background-color: #f9fafb;
  padding: 4rem 0;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.testimonial-card {
  background-color: #ffffff;
  padding: 2rem;
  border-radius: 8px;
  border: 1px solid #e5e7eb;
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 600;
  font-size: 1.2rem;
}

.testimonial-info h4 {
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.testimonial-date {
  font-size: 0.8rem;
  color: #9ca3af;
}

.testimonial-rating {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1rem;
}

.star {
  color: #fbbf24;
  font-size: 1rem;
}

.testimonial-content {
  color: #6b7280;
  line-height: 1.6;
}

/* 12. FAQ */
.faq-section {
  padding: 4rem 0;
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 1rem;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  overflow: hidden;
}

.faq-question {
  background-color: #f9fafb;
  padding: 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: #1f2937;
  transition: all 0.3s ease;
}

.faq-question:hover {
  background-color: #f3f4f6;
}

.faq-toggle {
  font-size: 1.2rem;
  color: #2563eb;
  transition: transform 0.3s ease;
}

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

.faq-answer {
  display: none;
  padding: 1.5rem;
  background-color: #ffffff;
  color: #6b7280;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 13. CTA Section */
.cta-section {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff;
  padding: 4rem 0;
  text-align: center;
}

.cta-title {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: #ffffff;
}

.cta-subtitle {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  color: rgba(255, 255, 255, 0.9);
}

.cta-form {
  display: flex;
  gap: 1rem;
  max-width: 600px;
  margin: 0 auto;
  flex-wrap: wrap;
  justify-content: center;
}

.cta-input {
  flex: 1;
  min-width: 250px;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  color: #1f2937;
}

.cta-input::placeholder {
  color: #9ca3af;
}

.cta-btn {
  background-color: #ffffff;
  color: #2563eb;
  padding: 0.75rem 2rem;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
  .cta-form {
    flex-direction: column;
  }

  .cta-input {
    min-width: 100%;
  }
}

/* 14. 页脚 */
.footer {
  background-color: #1f2937;
  color: #d1d5db;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: #ffffff;
  margin-bottom: 1rem;
  font-size: 1rem;
}

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

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: #d1d5db;
  transition: color 0.3s ease;
}

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

.footer-description {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #9ca3af;
}

.footer-social {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #d1d5db;
  transition: all 0.3s ease;
  cursor: pointer;
}

.social-icon:hover {
  background-color: #2563eb;
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid #374151;
  padding-top: 2rem;
  text-align: center;
  color: #9ca3af;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
  }
}

/* 15. 响应式设计 */
@media (max-width: 1024px) {
  .container {
    padding: 0 1.5rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .section {
    padding: 3rem 0;
  }
}

@media (max-width: 768px) {
  .navbar-content {
    height: 60px;
    padding: 0 1rem;
  }

  .navbar-logo {
    font-size: 1.2rem;
  }

  .navbar-menu {
    gap: 1rem;
  }

  .hero {
    padding: 2rem 0;
  }

  .hero-text h1 {
    font-size: 1.8rem;
  }

  .topics-grid {
    grid-template-columns: 1fr;
  }

  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
  }
}

/* 16. 动画效果 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

.slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

/* 17. 工具类 */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden {
  display: none;
}

.visible {
  display: block;
}

/* 18. 打印样式 */
@media print {
  .navbar,
  .cta-section {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
  }
}