/* 
  Global Styles for AI QuizGen SaaS Platform
  Combines with Tailwind CSS for premium UI
*/

:root {
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
}

.dark-mode {
    --glass-bg: rgba(17, 24, 39, 0.7);
    --glass-border: rgba(31, 41, 55, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-family: 'Inter', sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Glassmorphism Utilities */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px 0 rgba(31, 38, 135, 0.1);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #6366f1;
}

.dark-mode ::-webkit-scrollbar-thumb {
    background: #475569;
}

.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: #818cf8;
}

/* Animations */
@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.animate-shimmer {
    animation: shimmer 2s infinite linear;
}

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.dark-mode .skeleton {
    background: linear-gradient(90deg, #1f2937 25%, #374151 50%, #1f2937 75%);
    background-size: 200% 100%;
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    border-radius: 1rem;
    background: white;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transform: translateY(150%);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast.success { border-left: 4px solid #10b981; }
.toast.error { border-left: 4px solid #ef4444; }
.toast.info { border-left: 4px solid #3b82f6; }

/* Flip Card (For Flashcards) */
.perspective-1000 { perspective: 1000px; }
.transform-style-3d { transform-style: preserve-3d; }
.backface-hidden { backface-visibility: hidden; }
.rotate-y-180 { transform: rotateY(180deg); }
.flip-card-inner { transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1); }
.flipped .flip-card-inner { transform: rotateY(180deg); }

/* Option Cards Custom Radio */
.custom-radio:checked + div {
    border-color: #4f46e5;
    background-color: #eef2ff;
    color: #4338ca;
}

.dark-mode .custom-radio:checked + div {
    border-color: #818cf8;
    background-color: rgba(79, 70, 229, 0.1);
    color: #e0e7ff;
}

.custom-radio:checked + div .radio-circle {
    border-color: #4f46e5;
    background-color: #4f46e5;
}

.dark-mode .custom-radio:checked + div .radio-circle {
    border-color: #818cf8;
    background-color: #818cf8;
}

/* Dynamic Gradients */
.bg-gradient-premium {
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
}