:root {
  /* Google Fonts Import */
  @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

  font-family: 'Inter', sans-serif;
  line-height: 1.5;
  box-sizing: border-box;

  /* Theme variables - Light Mode Default */
  --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  --glass-bg: rgba(255, 255, 255, 0.45);
  --glass-border: rgba(255, 255, 255, 0.25);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.08);
  --text-main: #1e293b;
  --text-muted: #64748b;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --card-glow: rgba(59, 130, 246, 0.05);
}

[data-theme="dark"] {
  /* Dark Mode Styles */
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  --glass-bg: rgba(15, 23, 42, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #60a5fa;
  --primary-hover: #3b82f6;
  --success: #34d399;
  --danger: #f87171;
  --warning: #fbbf24;
  --card-glow: rgba(96, 165, 250, 0.1);
}

* {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

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

/* Glassmorphism utility */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* Container styling */
.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 20px;
}

/* Auth card design */
.auth-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 440px;
  border-radius: 24px;
  padding: 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.auth-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--card-glow) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}

.auth-header {
  position: relative;
  z-index: 1;
  margin-bottom: 30px;
}

.auth-logo {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 10px;
  animation: pulse 3s infinite;
}

.auth-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 5px;
}

.auth-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.form-group {
  position: relative;
  margin-bottom: 20px;
  text-align: left;
  z-index: 1;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}

.form-control {
  width: 100%;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  font-size: 1rem;
  outline: none;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.btn-primary {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  border: none;
  background: var(--primary);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  z-index: 1;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px -4px rgba(59, 130, 246, 0.4);
}

.btn-primary:active {
  transform: translateY(1px);
}

.alert-danger {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--danger);
  padding: 12px;
  border-radius: 12px;
  font-size: 0.875rem;
  margin-bottom: 20px;
  z-index: 1;
  position: relative;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}