:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --secondary: #8b5cf6;
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: rgba(30, 41, 59, 0.7);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #334155;
  --glass-bg: rgba(30, 41, 59, 0.8);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --error: #ef4444;
  --warning: #f59e0b;
  --success: #10b981;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  background-image: radial-gradient(at 40% 20%, rgba(99,102,241,0.1) 0px, transparent 50%);
  background-attachment: fixed;
}

.navbar {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  padding: 12px 20px;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-logo {
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-decoration: none;
}

.navbar-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.navbar-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  transition: all 0.2s;
  padding: 8px 12px;
  border-radius: 8px;
}

.navbar-link:hover, .navbar-link.active {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 16px;
}

.balance-display {
  background: var(--bg-tertiary);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 14px;
}

.login-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  padding: 8px 16px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(99,102,241,0.3);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: var(--glass-shadow);
}

.btn-gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(99,102,241,0.3);
}

.btn-gradient:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99,102,241,0.4);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
}

.btn-outline:hover {
  background: rgba(99,102,241,0.1);
}

.input-modern {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
}

.input-modern:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.2);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--bg-tertiary);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.fade-in {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.tip {
  color: var(--warning);
  font-size: 13px;
  margin-top: 8px;
}

.footer {
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border);
    padding: 24px 20px;
    text-align: center;
    margin-top: 60px;
}
.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}
.footer-container p,
.footer-container div {
    color: var(--text-secondary);
    font-size: 13px;
    margin: 4px 0;
}

/* 导航下拉菜单 */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.nav-dropdown .dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    min-width: 160px;
    z-index: 100;
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.nav-dropdown .dropdown-content a {
    display: block;
    padding: 10px 16px;
    color: var(--text-primary);
    text-decoration: none;
    transition: 0.2s;
}

.nav-dropdown .dropdown-content a:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
}

.nav-dropdown:hover .dropdown-content {
    display: block;
}