/* FlashCards Web App Styles - Dark Theme */

:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    
    /* Dark theme colors */
    --dark-bg: #1a1a2e;
    --dark-bg-secondary: #16213e;
    --dark-bg-tertiary: #0f3460;
    --dark-card-bg: #16213e;
    --dark-text: #e4e4e4;
    --dark-text-secondary: #b8b8b8;
    --dark-border: #2d3748;
}

/* Utility classes */
.hidden {
    display: none !important;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    background-attachment: fixed;
    color: var(--dark-text);
}

.container {
    background-color: var(--dark-card-bg);
    border-radius: 10px;
    padding: 30px;
    margin-top: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    flex: 1;
    color: var(--dark-text);
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    background-color: var(--primary-color) !important;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: #ffffff !important;
}

.navbar-icon {
    font-size: 1.8rem;
    vertical-align: middle;
}

/* Ensure navbar links are readable */
.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
}

.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-link:focus {
    color: #ffffff !important;
}

/* Ensure navbar toggler is visible */
.navbar-toggler {
    border-color: rgba(255, 255, 255, 0.5);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Stat Cards */
.stat-card {
    transition: transform 0.2s, box-shadow 0.2s;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    background-color: var(--dark-bg-tertiary);
    color: var(--dark-text);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
}

.stat-card .display-4 {
    font-weight: bold;
    margin-top: 10px;
    color: var(--dark-text);
}

/* Flashcard Styles */
.flashcard {
    transition: transform 0.2s, box-shadow 0.2s;
    border: 2px solid var(--dark-border);
    background-color: var(--dark-bg-tertiary);
    color: var(--dark-text);
}

.flashcard:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
}

.flashcard.border-warning {
    border-color: var(--warning-color) !important;
    border-width: 3px;
}

.card-meta {
    background-color: var(--dark-bg-secondary);
    padding: 10px;
    border-radius: 5px;
    margin-top: 10px;
    color: var(--dark-text-secondary);
}

/* Study Mode */
.study-card {
    border: 2px solid #0d6efd;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
    background-color: var(--dark-bg-tertiary);
    color: var(--dark-text);
}

.flashcard-content {
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--dark-bg-secondary);
    padding: 20px;
    border-radius: 8px;
    color: var(--dark-text);
}

.flashcard-content .lead {
    font-size: 1.3rem;
    margin: 0;
    text-align: center;
    color: var(--dark-text);
}

.reveal-btn, .review-buttons {
    transition: all 0.3s ease;
}

/* Footer */
.footer {
    background-color: var(--dark-card-bg);
    margin-top: auto;
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.3);
    color: var(--dark-text-secondary);
}

/* Difficulty badges */
.badge {
    font-size: 0.9rem;
    padding: 0.5em 0.8em;
}

/* Buttons */
.btn {
    transition: all 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

/* Form styles */
.form-control,
.form-select {
    background-color: var(--dark-bg-secondary);
    border-color: var(--dark-border);
    color: var(--dark-text);
}

.form-control:focus,
.form-select:focus {
    background-color: var(--dark-bg-secondary);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
    color: var(--dark-text);
}

.form-label {
    color: var(--dark-text);
}

/* Alert styles */
.alert {
    border-radius: 8px;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

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

.card {
    animation: fadeIn 0.3s ease-in;
    background-color: var(--dark-bg-tertiary);
    border-color: var(--dark-border);
    color: var(--dark-text);
}

.card-header {
    background-color: var(--dark-bg-secondary);
    border-bottom-color: var(--dark-border);
    color: var(--dark-text);
}

.card-body {
    background-color: var(--dark-bg-tertiary);
    color: var(--dark-text);
}

.card-title {
    color: var(--dark-text);
}

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

/* Headings */
h1, h2, h3, h4, h5, h6 {
    color: var(--dark-text);
}

/* Links */
a {
    color: #4dabf7;
}

a:hover {
    color: #74c0fc;
}

/* Text colors */
.text-muted {
    color: var(--dark-text-secondary) !important;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .stat-card .display-4 {
        font-size: 2.5rem;
    }
    
    .container {
        padding: 15px;
    }
}

/* Difficulty stats styling */
.difficulty-stats {
    font-size: 1.1rem;
}

.difficulty-stats .badge {
    font-size: 1rem;
    min-width: 40px;
}