/**
 * Custom Styles for Dentistry Quiz Application
 * Dark theme with purple accent (RGB: 86, 42, 67)
 */

:root {
    /* Color Palette */
    --primary-purple: rgb(86, 42, 67);
    --primary-purple-light: rgb(106, 52, 82);
    --primary-purple-dark: rgb(66, 32, 51);
    --background-dark: #1a1a1a;
    --background-darker: #0f0f0f;
    --surface-dark: #252525;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #707070;
    --success-green: #22c55e;
    --error-red: #ef4444;
    --warning-yellow: #f59e0b;
    --border-color: #3a3a3a;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===================================
   BUTTON STYLES
   =================================== */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    transition: all var(--transition-normal);
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-purple);
    color: var(--text-primary);
}

.btn-primary:hover {
    background-color: var(--primary-purple-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(86, 42, 67, 0.4);
}

.btn-secondary {
    background-color: var(--surface-dark);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #3a3a3a;
    border-color: var(--primary-purple);
}

.btn-success {
    background-color: var(--success-green);
    color: white;
}

.btn-success:hover {
    background-color: #16a34a;
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.4);
}

.btn-danger {
    background-color: var(--error-red);
    color: white;
}

.btn-danger:hover {
    background-color: #dc2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.btn-disabled,
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* ===================================
   FORM STYLES
   =================================== */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--surface-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-purple);
    box-shadow: 0 0 0 3px rgba(86, 42, 67, 0.2);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-select {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--surface-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-purple);
    box-shadow: 0 0 0 3px rgba(86, 42, 67, 0.2);
}

.form-radio,
.form-checkbox {
    accent-color: var(--primary-purple);
}

.form-error {
    color: var(--error-red);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

/* ===================================
   CARD COMPONENTS
   =================================== */

.card {
    background-color: var(--surface-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--primary-purple);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.card-header {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.card-body {
    color: var(--text-secondary);
}

.card-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* ===================================
   MODAL STYLING
   =================================== */

.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeIn var(--transition-fast);
}

.modal-content {
    background-color: var(--surface-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    animation: slideUp var(--transition-normal);
}

.modal-header {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.modal-body {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* ===================================
   ALERT/NOTIFICATION STYLING
   =================================== */

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid;
}

.alert-success {
    background-color: rgba(34, 197, 94, 0.1);
    border-left-color: var(--success-green);
    color: var(--success-green);
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    border-left-color: var(--error-red);
    color: var(--error-red);
}

.alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    border-left-color: var(--warning-yellow);
    color: var(--warning-yellow);
}

.alert-info {
    background-color: rgba(59, 130, 246, 0.1);
    border-left-color: #3b82f6;
    color: #3b82f6;
}

/* ===================================
   NAVIGATION BAR
   =================================== */

.navbar {
    background-color: var(--background-darker);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-purple);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.navbar-brand:hover {
    color: var(--primary-purple-light);
}

.navbar-link {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: var(--spacing-lg);
    transition: color var(--transition-fast);
}

.navbar-link:hover {
    color: var(--primary-purple);
}

/* ===================================
   FOOTER
   =================================== */

footer {
    background-color: var(--background-darker);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    margin-top: auto;
}

/* ===================================
   CONTAINER
   =================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ===================================
   UTILITY CLASSES
   =================================== */

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-left {
    text-align: left;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

/* ===================================
   ANIMATION CLASSES
   =================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.fade-in {
    animation: fadeIn var(--transition-normal);
}

.slide-up {
    animation: slideUp var(--transition-normal);
}

.pulse {
    animation: pulse 2s infinite;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .modal-content {
        max-width: 95%;
        padding: var(--spacing-lg);
    }
    
    .btn {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
}

/* ===================================
   SCROLLBAR STYLING
   =================================== */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--background-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-purple);
    border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-purple-light);
}

/* ===================================
   LOADING SPINNER
   =================================== */

.spinner {
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--primary-purple);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

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

/* ===================================
   QUIZ-SPECIFIC STYLES
   =================================== */

.question-option {
    transition: all var(--transition-fast);
}

.question-option:hover {
    background-color: var(--surface-dark);
    border-color: var(--primary-purple);
}

.question-option.selected {
    background-color: var(--primary-purple);
    border-color: var(--primary-purple);
}

.question-option.correct {
    background-color: rgba(34, 197, 94, 0.2);
    border-color: var(--success-green);
}

.question-option.incorrect {
    background-color: rgba(239, 68, 68, 0.2);
    border-color: var(--error-red);
}

.progress-bar {
    height: 8px;
    background-color: var(--surface-dark);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary-purple);
    transition: width var(--transition-normal);
}

/* ===================================
   BADGE STYLES
   =================================== */

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
}

.badge-primary {
    background-color: var(--primary-purple);
    color: white;
}

.badge-success {
    background-color: var(--success-green);
    color: white;
}

.badge-error {
    background-color: var(--error-red);
    color: white;
}

.badge-warning {
    background-color: var(--warning-yellow);
    color: white;
}