/* CSS Custom Properties for easy future theming */
:root {
    --bg-color: #f4f4f9;
    --text-color: #212529;
    --card-bg: #ffffff;
    --card-border: #cccccc;
    --subtle-text: #6c757d;
    --tag-bg: #e9ecef;
    --tag-color: #495057;

    /* Theme Colors */
    --primary: #007bff;
    --primary-hover: #0056b3;
    --success: #28a745;
    --success-hover: #218838;
    --info: #17a2b8;
    --info-hover: #138496;
    --danger: #dc3545;
    --danger-hover: #bd2130;
    --accent: #6f42c1;
    --accent-hover: #593196;
    --neutral: #6c757d;
    --neutral-hover: #5a6268;

    /* Test Feedback Colors */
    --correct-bg: #d4edda;
    --correct-border: #28a745;
    --correct-text: #155724;
    --incorrect-bg: #f8d7da;
    --incorrect-border: #dc3545;
    --incorrect-text: #721c24;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    box-sizing: border-box;
    margin: 0;
}

.container {
    width: 100%;
    max-width: 1200px;
}

/* Centered Top Control Panel */
.controls-panel {
    max-width: 420px;
    margin: 0 auto 20px auto;
    width: 100%;
}

.folder-filter {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
}

.folder-filter select {
    flex-grow: 1;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid var(--card-border);
}

.backup-controls, .test-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    width: 100%;
}

.backup-controls button, .test-controls button {
    flex: 1;
}

.form-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    margin-bottom: 20px;
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--card-border);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    box-sizing: border-box;
}

.form-container h3 {
    margin-top: 0;
    margin-bottom: 10px;
}

input, textarea, select {
    padding: 10px;
    border: 1px solid var(--card-border);
    border-radius: 4px;
    font-size: 14px;
    background-color: var(--card-bg);
    color: var(--text-color);
}

button {
    padding: 10px 15px;
    font-size: 14px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background-color: var(--primary);
    color: white;
    transition: background-color 0.15s ease-in-out;
}

button:hover { background-color: var(--primary-hover); }
.btn-export { background-color: var(--success); }
.btn-export:hover { background-color: var(--success-hover); }
.btn-import { background-color: var(--info); }
.btn-import:hover { background-color: var(--info-hover); }
.btn-delete { background-color: var(--danger); }
.btn-delete:hover { background-color: var(--danger-hover); }
.btn-test { background-color: var(--accent); }
.btn-test:hover { background-color: var(--accent-hover); }
.btn-end { background-color: var(--neutral); }
.btn-end:hover { background-color: var(--neutral-hover); }

/* Responsive 4-Column Card Grid */
#main-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    width: 100%;
}

@media (max-width: 1024px) {
    #main-content { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    #main-content { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 500px) {
    #main-content { grid-template-columns: 1fr; }
}

.card {
    width: 100%;
    padding: 20px;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.08);
    background-color: var(--card-bg);
    text-align: center;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card h2 {
    font-size: 1.2rem;
    word-break: break-word;
    margin: 15px 0;
}

.card-actions {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 10px;
}

.tag {
    display: inline-block;
    background: var(--tag-bg);
    color: var(--tag-color);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    align-self: center;
}

/* Test Mode Styling */
.test-box {
    grid-column: 1 / -1;
    max-width: 420px;
    width: 100%;
    justify-self: center;
    background: var(--card-bg);
    padding: 25px 20px;
    border-radius: 8px;
    border: 1px solid var(--card-border);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    box-sizing: border-box;
}

.test-header {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: var(--subtle-text);
    margin-bottom: 15px;
}

.mc-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 20px 0;
}

.mc-btn {
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--card-border);
    text-align: left;
    padding: 12px 15px;
    border-radius: 6px;
}

.mc-btn:hover:not(:disabled) {
    filter: brightness(0.95);
}

.mc-btn.correct {
    background-color: var(--correct-bg) !important;
    border-color: var(--correct-border) !important;
    color: var(--correct-text) !important;
    font-weight: bold;
}

.mc-btn.incorrect {
    background-color: var(--incorrect-bg) !important;
    border-color: var(--incorrect-border) !important;
    color: var(--incorrect-text) !important;
}