:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --card-bg-color: #ffffff;
    --text-color: #212529;
    --border-color: #dee2e6;
}

[data-theme="dark"] {
    --primary-color: #0d6efd;
    --secondary-color: #adb5bd;
    --background-color: #212529;
    --card-bg-color: #343a40;
    --text-color: #f8f9fa;
    --border-color: #495057;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    transition: all 0.3s ease;
}

.card {
    background-color: var(--card-bg-color);
    border-color: var(--border-color);
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: all 0.3s ease;
}

.card-header {
    background-color: rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid var(--border-color);
}

.list-group-item {
    background-color: var(--card-bg-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

.list-group-item:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 5px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(13, 110, 253, 0.05);
}

.file-list {
    min-height: 200px;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    margin-bottom: 0.5rem;
    background-color: var(--card-bg-color);
    transition: all 0.3s ease;
}

.file-item:hover {
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1);
}

.file-thumbnail {
    width: 50px;
    height: 50px;
    margin-right: 1rem;
    border-radius: 5px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.03);
}

.file-thumbnail img {
    max-width: 100%;
    max-height: 100%;
}

.file-thumbnail .file-icon {
    font-size: 1.5rem;
    color: var(--secondary-color);
}

.file-info {
    flex-grow: 1;
}

.file-name {
    font-weight: 500;
    margin-bottom: 0.25rem;
    word-break: break-word;
}

.file-meta {
    font-size: 0.875rem;
    color: var(--secondary-color);
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

.empty-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--secondary-color);
}

.result-item {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    margin-bottom: 0.5rem;
    background-color: var(--card-bg-color);
}

.result-info {
    flex-grow: 1;
}

.sortable-ghost {
    opacity: 0.5;
    background-color: rgba(13, 110, 253, 0.1);
}

.drag-handle {
    cursor: grab;
    padding: 0.5rem;
    margin-right: 0.5rem;
    color: var(--secondary-color);
}

.insert-file-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 0.5rem;
}

.theme-switch .form-check-input:checked {
    background-color: #6610f2;
    border-color: #6610f2;
}

footer {
    background-color: var(--card-bg-color);
}

/* カスタムモーダルのスタイル */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1050;
}

.modal-container {
    background-color: var(--card-bg-color);
    border-radius: 5px;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    width: 90%;
    max-width: 500px;
}

.modal-content {
    border: none;
    background-color: var(--card-bg-color);
    color: var(--text-color);
}

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

.modal-body {
    padding: 1rem;
}