:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #ffffff;
    --accent-color: #1db954;
    --accent-hover: #1ed760;
    --edit-color: #3498db;
    --edit-hover: #2980b9;
    --danger-color: #e74c3c;
    --danger-hover: #c0392b;
    --modal-bg: #282828;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    margin-bottom: 10px;
    font-size: 2.5rem;
    color: var(--accent-color);
}

.form-container, .search-container {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 25px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.form-container h2, .search-container h2 {
    margin-top: 0;
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-size: 0.9rem;
    color: #b3b3b3;
}

.form-group input, .search-container input {
    width: 100%;
    padding: 10px;
    border: 1px solid #333;
    border-radius: 6px;
    background-color: #2a2a2a;
    color: white;
    box-sizing: border-box;
    font-size: 1rem;
}

button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background-color: var(--accent-hover);
}

#cancelEditBtn {
    background-color: #555;
    margin-left: 10px;
    display: none;
}

#cancelEditBtn:hover {
    background-color: #666;
}

.form-buttons {
    display: flex;
    align-items: center;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 15px;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.4);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    word-break: break-word;
}

.card-actions {
    display: flex;
    gap: 6px;
}

.card-actions button, .card-actions a {
    flex: 1;
    padding: 8px 6px;
    font-size: 0.85rem;
    text-align: center;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    display: inline-block;
    box-sizing: border-box;
    border: none;
    cursor: pointer;
}

.btn-open {
    background-color: var(--accent-color);
    color: white;
}

.btn-open:hover {
    background-color: var(--accent-hover);
    color: white;
}

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

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

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

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

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    color: #b3b3b3;
    padding: 40px;
    font-style: italic;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--modal-bg);
    padding: 25px;
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    text-align: center;
}

.modal h3 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.modal p {
    color: #b3b3b3;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.modal-buttons button {
    flex: 1;
}

.btn-cancel {
    background-color: #444;
}

.btn-cancel:hover {
    background-color: #555;
}

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

.btn-confirm-delete:hover {
    background-color: var(--danger-hover);
}