/* Light Black Gold Theme */
:root {
  --primary-gold: #D4AF37;
  --dark-gold: #996515;
  --light-gold: #F9E29C;
  --bg-black: #121212;
  --bg-card: #1E1E1E;
  --text-white: #FFFFFF;
  --text-gray: #B0B0B0;
  --accent-gold: #C5A028;
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body {
  background-color: var(--bg-black);
  color: var(--text-white);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
  cursor: pointer;
  transition: transform 0.5s ease;
}

img:hover {
  transform: scale(1.05);
}

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(18, 18, 18, 0.95);
  border-bottom: 1px solid var(--dark-gold);
  z-index: 1000;
  padding: 1rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-gold);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo span {
  color: var(--text-white);
}

nav ul {
  display: flex;
  gap: 2rem;
}

nav ul li a:hover {
  color: var(--primary-gold);
}

.mobile-menu-btn {
  display: none;
  font-size: 1.5rem;
  color: var(--primary-gold);
  cursor: pointer;
}

/* Hero Section */
.hero {
  height: 80vh;
  background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://tse-mm.bing.com/th?q=体育馆') center/cover;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 5%;
}

.hero h1 {
  font-size: 4rem;
  color: var(--primary-gold);
  margin-bottom: 1rem;
  text-shadow: 2px 2px 10px rgba(0,0,0,0.5);
}

.hero p {
  font-size: 1.2rem;
  max-width: 800px;
  margin-bottom: 2rem;
}

.btn {
  padding: 0.8rem 2rem;
  background: var(--primary-gold);
  color: var(--bg-black);
  font-weight: bold;
  border-radius: 5px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn:hover {
  background: var(--light-gold);
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(212, 175, 55, 0.4);
}

/* Sections */
section {
  padding: 5rem 5%;
}

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

.section-title h2 {
  font-size: 2.5rem;
  color: var(--primary-gold);
  position: relative;
  display: inline-block;
  padding-bottom: 10px;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--primary-gold);
}

/* Grid Layouts */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--bg-card);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(212, 175, 55, 0.1);
  transition: var(--transition);
}

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

.card-img {
  height: 200px;
  overflow: hidden;
}

.card-content {
  padding: 1.5rem;
}

.card-content h3 {
  color: var(--primary-gold);
  margin-bottom: 10px;
}

/* Footer */
footer {
  background: #0a0a0a;
  padding: 4rem 5% 2rem;
  border-top: 2px solid var(--dark-gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: var(--primary-gold);
  margin-bottom: 1.5rem;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.9rem;
  color: var(--text-gray);
}

/* Responsive */
@media (max-width: 768px) {
  header nav {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero h1 {
    font-size: 2.5rem;
  }
}

/* Smooth Scroll */
html {
  scroll-behavior: smooth;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate {
  animation: fadeIn 1s ease forwards;
}