/* style.css - 米兰体育官方网站 */
:root {
  --primary: #e31b23;
  --primary-dark: #b0151c;
  --secondary: #1a1a2e;
  --accent: #f5c518;
  --bg-light: #f8f9fa;
  --bg-dark: #0d0d1a;
  --text-light: #333;
  --text-dark: #e0e0e0;
  --glass-bg: rgba(255,255,255,0.1);
  --glass-border: rgba(255,255,255,0.2);
  --shadow: 0 8px 32px rgba(0,0,0,0.1);
  --radius: 16px;
  --transition: 0.3s ease;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-light);
  color: var(--text-light);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}
body.dark-mode {
  background: var(--bg-dark);
  color: var(--text-dark);
}
a {
  color: var(--primary);
  text-decoration: none;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
header {
  background: linear-gradient(135deg, var(--secondary), #16213e);
  color: #fff;
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: rgba(26,26,46,0.9);
}
header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}
.logo {
  font-size: 1.8rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo svg {
  width: 40px;
  height: 40px;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
nav a {
  color: #fff;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  transition: background var(--transition);
}
nav a:hover, nav a.active {
  background: var(--primary);
}
.hero {
  background: linear-gradient(135deg, var(--secondary) 0%, #0f3460 50%, var(--primary) 100%);
  color: #fff;
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  animation: fadeInUp 1s ease;
}
.hero p {
  font-size: 1.3rem;
  max-width: 700px;
  margin: 0 auto 30px;
  opacity: 0.9;
}
.hero .btn {
  background: var(--accent);
  color: #1a1a2e;
  padding: 14px 40px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1.1rem;
  display: inline-block;
  transition: transform var(--transition);
}
.hero .btn:hover {
  transform: scale(1.05);
}
.banner-carousel {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 40px auto 0;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.banner-slide {
  display: none;
  width: 100%;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(8px);
  padding: 60px 20px;
  border: 1px solid var(--glass-border);
}
.banner-slide.active {
  display: block;
  animation: fadeIn 1s ease;
}
.banner-slide h2 {
  font-size: 2rem;
  margin-bottom: 10px;
}
.banner-slide p {
  font-size: 1.1rem;
}
.carousel-controls {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 20px;
}
.carousel-controls button {
  background: rgba(255,255,255,0.2);
  border: none;
  color: #fff;
  padding: 10px 20px;
  border-radius: 30px;
  cursor: pointer;
  transition: background var(--transition);
}
.carousel-controls button:hover {
  background: var(--primary);
}
section {
  padding: 80px 0;
}
.section-title {
  text-align: center;
  font-size: 2.2rem;
  margin-bottom: 50px;
  position: relative;
}
.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--primary);
  margin: 10px auto 0;
  border-radius: 2px;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}
.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  backdrop-filter: blur(4px);
  background: rgba(255,255,255,0.8);
  border: 1px solid rgba(255,255,255,0.3);
}
body.dark-mode .card {
  background: rgba(30,30,50,0.8);
  border-color: rgba(255,255,255,0.1);
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}
.card svg {
  width: 60px;
  height: 60px;
  margin-bottom: 15px;
}
.card h3 {
  font-size: 1.4rem;
  margin-bottom: 10px;
}
.card p {
  opacity: 0.8;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  text-align: center;
}
.stat-item {
  padding: 30px;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  backdrop-filter: blur(4px);
  border: 1px solid var(--glass-border);
}
.stat-item .number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
}
.faq-item {
  border-bottom: 1px solid rgba(0,0,0,0.1);
  padding: 15px 0;
}
body.dark-mode .faq-item {
  border-color: rgba(255,255,255,0.1);
}
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.1rem;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding-top: 10px;
}
.faq-item.open .faq-answer {
  max-height: 300px;
}
footer {
  background: var(--secondary);
  color: #fff;
  padding: 60px 0 20px;
}
footer .container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
}
footer h4 {
  margin-bottom: 15px;
  font-size: 1.2rem;
}
footer a {
  color: #aaa;
  display: block;
  margin-bottom: 8px;
  transition: color var(--transition);
}
footer a:hover {
  color: #fff;
}
.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 30px;
  font-size: 0.9rem;
}
.breadcrumb {
  padding: 15px 0;
  font-size: 0.9rem;
  background: rgba(0,0,0,0.03);
}
body.dark-mode .breadcrumb {
  background: rgba(255,255,255,0.03);
}
.breadcrumb a {
  color: var(--primary);
}
.search-box {
  display: flex;
  gap: 10px;
  max-width: 400px;
  margin: 20px auto;
}
.search-box input {
  flex: 1;
  padding: 12px 20px;
  border-radius: 30px;
  border: 2px solid #ddd;
  font-size: 1rem;
  outline: none;
  transition: border var(--transition);
}
body.dark-mode .search-box input {
  background: #2a2a3e;
  border-color: #444;
  color: #fff;
}
.search-box input:focus {
  border-color: var(--primary);
}
.search-box button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 12px 25px;
  border-radius: 30px;
  cursor: pointer;
  font-weight: 600;
}
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.8rem;
  cursor: pointer;
}
@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }
  nav ul {
    display: none;
    flex-direction: column;
    width: 100%;
    background: rgba(26,26,46,0.95);
    padding: 20px;
    border-radius: var(--radius);
    margin-top: 10px;
  }
  nav ul.open {
    display: flex;
  }
  .hero h1 {
    font-size: 2.5rem;
  }
  .hero p {
    font-size: 1.1rem;
  }
}
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--primary);
  color: #fff;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 999;
  border: none;
  font-size: 1.5rem;
}
.back-to-top.show {
  opacity: 1;
}
.theme-toggle {
  background: none;
  border: 2px solid rgba(255,255,255,0.3);
  color: #fff;
  padding: 8px 16px;
  border-radius: 30px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background var(--transition);
}
.theme-toggle:hover {
  background: rgba(255,255,255,0.1);
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}