/* ===========================================
   MODULAR QUIZ APP - COMMON STYLES
   Sdílené styly pro všechny moduly
   =========================================== */

/* CSS Variables for consistent theming */
:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --secondary-color: #4CAF50;
    --accent-color: #FF9800;
    --error-color: #F44336;
    --warning-color: #FF9800;
    --success-color: #4CAF50;
    --info-color: #2196F3;
    
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-hint: #BDBDBD;
    
    --background-primary: #FAFAFA;
    --background-secondary: #FFFFFF;
    --background-dark: #303030;
    
    --border-color: #E0E0E0;
    --shadow-light: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 8px rgba(0,0,0,0.15);
    --shadow-heavy: 0 8px 16px rgba(0,0,0,0.2);
    
    --border-radius: 8px;
    --border-radius-large: 12px;
    --transition: all 0.3s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    font-size: 16px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    transition: var(--transition);
    text-decoration: none;
}

.btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--secondary-color);
}

.btn-secondary:hover {
    background-color: #45a049;
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

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

.btn-danger:hover {
    background-color: #d32f2f;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background-color: white;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.form-input:invalid {
    border-color: var(--error-color);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

/* Cards */
.card {
    background-color: var(--background-secondary);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-light);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-medium);
}

.card-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.card-title {
    margin-bottom: 0.5rem;
}

.card-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.container-small {
    max-width: 800px;
}

.container-large {
    max-width: 1400px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -0.5rem;
}

.col {
    flex: 1;
    padding: 0 0.5rem;
}

.col-2 { flex: 0 0 16.666667%; }
.col-3 { flex: 0 0 25%; }
.col-4 { flex: 0 0 33.333333%; }
.col-6 { flex: 0 0 50%; }
.col-8 { flex: 0 0 66.666667%; }
.col-9 { flex: 0 0 75%; }
.col-12 { flex: 0 0 100%; }

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.hidden { display: none; }
.visible { display: block; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--success-color); }
.text-error { color: var(--error-color); }
.text-warning { color: var(--warning-color); }

/* Notifications */
.notification {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border-left: 4px solid;
}

.notification-success {
    background-color: rgba(76, 175, 80, 0.1);
    border-left-color: var(--success-color);
    color: #2e7d32;
}

.notification-error {
    background-color: rgba(244, 67, 54, 0.1);
    border-left-color: var(--error-color);
    color: #c62828;
}

.notification-warning {
    background-color: rgba(255, 152, 0, 0.1);
    border-left-color: var(--warning-color);
    color: #ef6c00;
}

.notification-info {
    background-color: rgba(33, 150, 243, 0.1);
    border-left-color: var(--info-color);
    color: #1565c0;
}

/* Loading States */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 0.5rem;
    }
    
    .row {
        flex-direction: column;
    }
    
    .col, .col-2, .col-3, .col-4, .col-6, .col-8, .col-9 {
        flex: 0 0 100%;
        margin-bottom: 1rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .btn {
        padding: 0.875rem 1.25rem;
        font-size: 1rem;
    }
}

/* Module-specific Color Themes */
.module-card.oral-exam {
    border-left: 4px solid #9b59b6;
}

.module-card.oral-exam:hover {
    border-left-color: #8e44ad;
    box-shadow: 0 4px 20px rgba(155, 89, 182, 0.15);
}

/* Dark Theme Support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #E0E0E0;
        --text-secondary: #BDBDBD;
        --text-hint: #757575;
        --background-primary: #121212;
        --background-secondary: #1E1E1E;
        --border-color: #333333;
    }
    
    .form-input {
        background-color: var(--background-secondary);
        color: var(--text-primary);
    }
}

/* Print Styles */
@media print {
    .btn, .card {
        box-shadow: none;
    }
    
    .hidden-print {
        display: none;
    }
}