/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Color scheme variables */
:root {
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9F9F9;
    --text-primary: #000000;
    --text-secondary: #888888;
    --border-color: #E0E0E0;
    --layer-color: #EAEAEA;

    --border-color-hover: #b9b9b9;
    --border-color-focus: #939393;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #222222;
        --text-primary: #FFFFFF;
        --text-secondary: #888888;
        --border-color: #333333;
        --layer-color: #333333;

        --border-color-hover: #666666;
        --border-color-focus: #999999;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Icon styles */
.icon-svg {
    width: 20px;
    height: 20px;
    display: block;
    color: currentColor;
}

.icon-svg-small {
    width: 16px;
    height: 16px;
    display: block;
    color: currentColor;
}

.icon-img {
    width: 20px;
    height: 20px;
    display: inline-block;
    vertical-align: middle;
}

.icon-img-inline {
    width: 14px;
    height: 14px;
    display: inline-block;
    vertical-align: middle;
    margin-right: 8px;
}

.upload-icon {
    width: 48px;
    height: 48px;
    display: block;
    margin: 0 auto 12px;
}

.search-icon {
    width: 16px;
    height: 16px;
    margin-right: 8px;
}

.file-icon-img {
    width: 32px;
    height: 32px;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-header {
    padding: 12px 12px 0px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.categories-list {
    list-style: none;
    padding: 8px 0;
}

.category-item {
    margin: 0 8px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.15s;
    position: relative;
    color: var(--text-primary);
}

.category-item:hover {
    background: var(--layer-color);
}

.category-item.active {
    background: var(--layer-color);
}

.category-name {
    flex: 1;
    padding: 8px 10px 9px;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.category-btn-icon {
    border: none;
    cursor: pointer;
    font-size: 14px font-weight: 500;
    transition: all 0.15s;
    background: none;
}

.category-menu-btn {
    opacity: 0;
    transition: opacity 0.15s;
    padding: 2px 6px;
    font-size: 16px;
    margin: auto 4px auto 0;
    /* margin-right: 4px; */
    color: var(--text-primary);
}

.category-undo-btn {
    opacity: 1;
    padding: 2px 6px;
    font-size: 16px;
    margin: auto 4px auto 0;
    color: var(--text-primary);
}

.category-item:hover .category-menu-btn {
    opacity: 1;
}

/* Main content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Drop zone */
.drop-zone {
    margin: 20px 20px 12px;
    border: 1px solid var(--border-color);
    /* border: 2px dashed var(--border-color); */
    border-radius: 12px;
    padding: 36px 24px 40px 24px;
    text-align: center;
    transition: all 0.2s;
    background: var(--bg-secondary);
}

.drop-zone.drag-over {
    border-color: var(--text-primary);
    background: var(--layer-color);
}

.drop-zone-content {
    pointer-events: none;
}

.drop-zone-text {
    color: var(--text-secondary);
    margin-top: 8px;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-icon {
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.15s;
    background: none;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 10px 20px 11px;
    border-radius: 48px;
    pointer-events: all;
}

.btn-primary:hover {
    opacity: 0.8;
}

.btn-secondary {
    background: var(--layer-color);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 48px;
}

.btn-secondary:hover {
    opacity: 0.8;
}

/* UI control buttons (SVG icons) */
.btn-ui-icon {
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    background: none;
    color: var(--text-secondary);
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-ui-icon:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.btn-icon {
    color: var(--text-secondary);
    padding: 2px 8px 6px;
    border-radius: 8px;
    font-size: 16px;
    background-color: var(--text-secondary);
}

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

.btn-clear {
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 18px;
    padding: 8px 14px;
    transition: opacity 0.15s;
    line-height: 1;
    opacity: 0.7;
}

.btn-clear:hover {
    opacity: 1;
}

.controls {
    display: flex;
    gap: 12px;
    padding: 14px 20px 4px;
    align-items: center;
}

.search-container {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0 0 0 12px;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    padding: 12px 0;
    font-size: 14px;
    background: transparent;
    color: var(--text-primary);
}

.clear-search {
    font-size: 14px;
    padding: 4px;
}

.sort-toggle {
    background: var(--bg-secondary);
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 17px;
}

/* Files container */
.files-container {
    flex: 1;
    overflow-y: auto;
    padding: 0 20px;
}

.file-item {
    padding: 12px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.15s;
    border-bottom: 1px solid var(--border-color);
}

.file-icon {
    flex-shrink: 0;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 400;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-meta {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.file-actions {
    display: flex;
    opacity: 0;
    transition: opacity 0.15s;
}

.file-item:hover .file-actions {
    opacity: 1;
}

.action-btn {
    padding: 6px 8px;
    border: none;
    background: none;
    cursor: pointer;
    transition: background 0.15s;
    color: var(--text-secondary);
    border-radius: 8px;
}

.action-btn:hover {
    background: var(--bg-secondary);
}

.action-btn.danger:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Category selector */
.category-select {
    appearance: none;
    -webkit-appearance: none;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    cursor: pointer;
    outline: none;
    padding: 8px 28px 8px 12px;
    border: 1px solid var(--border-color);
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><polyline points='1 1 6 6 11 1' stroke='%23888888' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 12px 8px;
    border-radius: 8px;
    font-size: 13px;
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-left: 4px;
}

@media (prefers-color-scheme: dark) {
    .category-select {
        background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><polyline points='1 1 6 6 11 1' stroke='%23888888' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
    }
}

/* Stats */
.stats {
    padding: 8px 20px;
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--bg-primary);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 16px;
    width: 90%;
    max-width: 380px;
    border: 1px solid var(--border-color);
}

.modal-header {
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body {
    padding: 0 24px;
}

.modal-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.modal-input:hover {
    border-color: var(--border-color-hover);
}

.modal-input:focus {
    border-color: var(--border-color-focus);
}

.modal-footer {
    padding: 16px 24px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Context menu */
.context-menu {
    position: fixed;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 4px;
    z-index: 1000;
    min-width: 180px;
}

.menu-item {
    display: block;
    width: 100%;
    padding: 8px 12px;
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
    border-radius: 8px;
    font-size: 14px;
    transition: background 0.15s;
    color: var(--text-primary);
}

.menu-item:hover {
    background: var(--bg-secondary);
}

.menu-item-danger:hover {
    background: var(--bg-secondary);
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    min-width: 300px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-left: 3px solid var(--text-primary);
}

.toast.error {
    border-left: 3px solid var(--text-primary);
}

.toast.info {
    border-left: 3px solid var(--text-secondary);
}

.toast-message {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
    font-family: inherit;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        max-height: 200px;
    }

    .drop-zone {
        margin: 16px 16px 0;
        padding: 32px 16px;
    }

    .controls {
        padding: 16px;
    }

    .files-container {
        padding: 0 16px;
    }
}