:root {
  --bg-color: #0b0c10;
  --card-bg: #1f2833;
  --primary-color: #ff9f1c; /* 南瓜橙 */
  --primary-hover: #e08b10;
  --text-main: #ffffff;
  --text-muted: #c5c6c7;
  --accent-cyan: #45a29e;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 12, 16, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  transition: color 0.3s;
  font-weight: 500;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary-color);
}

/* Button */
.btn-primary {
  background: var(--primary-color);
  color: #000;
  padding: 0.75rem 1.5rem;
  border-radius: 30px;
  font-weight: 700;
  transition: all 0.3s ease;
  display: inline-block;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255, 159, 28, 0.4);
}

/* Container */
.main-content {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 2rem;
}

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

.page-title h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.page-title p {
  color: var(--text-muted);
}

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

.card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: transform 0.3s;
}

.card:hover {
  transform: translateY(-5px);
}

/* Footer */
.footer {
  background: #050608;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 3rem 2rem 1.5rem;
  margin-top: auto;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-bottom {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1.5rem;
}

/* Responsive Mobile */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }
  .nav-links {
    gap: 1rem;
    font-size: 0.9rem;
  }
  .page-title h1 {
    font-size: 1.8rem;
  }
}