.file-zone {
    border: 2px dashed #a1a1aa;
    border-radius: 8px;
    padding: 2.5rem;
    text-align: center;
    background: #fafafa;
    cursor: pointer;
    margin-bottom: 1.5rem;
    transition: all 0.2s;
    font-weight: 500;
    color: #666;
}

.file-zone:hover {
    background: #f0f0f0;
    border-color: var(--primary-color);
}

.file-zone.dragover {
    background: #e4e4e7;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.chapter-item {
    display: flex;
    margin-bottom: 12px;
    gap: 12px;
    align-items: center;
    background: #ffffff;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #d4d4d8;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.time-input {
    font-family: 'Courier New', Courier, monospace;
    width: 130px;
    padding: 10px;
    border: 1px solid #d4d4d8;
    border-radius: 6px;
    text-align: center;
    font-size: 0.9rem;
}

.title-input {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #d4d4d8;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: 'Montserrat', sans-serif;
}

.btn-del {
    background: transparent;
    color: var(--primary-color);
    border: none;
    border-radius: 6px;
    padding: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1.1rem;
}

.btn-del:hover {
    color: #c0392b;
    transform: scale(1.1);
}

.status-msg {
    padding: 15px;
    margin-bottom: 25px;
    border-radius: 6px;
    font-size: 0.95em;
    border-left: 5px solid var(--primary-color);
    background: #fdf2f1;
    color: #333;
    font-weight: 500;
}

.controls {
    display: none;
    gap: 15px;
    margin-top: 25px;
}

.controls.show {
    display: flex;
}

.btn-add {
    background: #333;
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    font-weight: 800;
    cursor: pointer;
    transition: background 0.3s;
    font-family: 'Montserrat', sans-serif;
}

.btn-add:hover {
    background: #000;
}

.btn-save {
    background: var(--primary-color);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    font-weight: 800;
    cursor: pointer;
    flex-grow: 1;
    transition: background 0.3s;
    font-family: 'Montserrat', sans-serif;
}

.btn-save:hover {
    background: #c0392b;
}

.btn-save:disabled {
    background: #ccc;
    cursor: not-allowed;
}

#file-input {
    display: none;
}

/* Drop Overlay */
#drop-overlay {
    background-color: rgba(0, 0, 0, 0.8) !important;
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

#drop-overlay.show {
    display: flex;
}

.drop-overlay-content {
    color: white;
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
}

.drop-overlay-icon {
    font-size: 5rem;
    margin-bottom: 1.5rem;
}