:root {
    --bg-color: #0d0d0d;
    --panel-bg: #141414;
    --border-color: #2a2a2a;
    --border-focus: #555555;
    --text-main: #e1e1e1;
    --text-muted: #777777;
    --hover-bg: #1e1e1e;
    --danger: #b33939;
    --danger-hover: #e74c3c;
    --primary: #ffffff;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    border-radius: 0;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Segoe UI', -apple-system, monospace, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    padding: 30px 20px;
    user-select: none;
    overflow-x: hidden;
}

.hidden { display: none !important; }
.clickable { cursor: pointer; color: var(--text-main); }
.clickable:hover { text-decoration: underline; }

.container {
    max-width: 1100px;
    margin: 0 auto;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    padding: 24px;
    position: relative;
    transition: border-color 0.2s, background 0.2s;
}

.container.drag-over {
    border-color: var(--primary);
    background: #181818;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
    margin-bottom: 20px;
    gap: 12px;
}

.logo {
    font-size: 16px;
    letter-spacing: 2px;
    font-weight: 700;
    white-space: nowrap;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.status-badge {
    font-size: 12px;
    color: var(--text-muted);
    font-family: monospace;
    overflow-x: auto;
    white-space: nowrap;
    max-width: 220px;
    scrollbar-width: none;
}
.status-badge::-webkit-scrollbar { display: none; }

.toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
}

.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.btn {
    background: var(--panel-bg);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    font-size: 12px;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn:hover {
    background: var(--text-main);
    color: var(--bg-color);
    border-color: var(--text-main);
}

.btn-primary {
    background: var(--text-main);
    color: var(--bg-color);
}

.btn-danger {
    color: var(--danger);
    border-color: #3d1a1a;
}

.btn-danger:hover {
    background: var(--danger-hover);
    color: #fff;
    border-color: var(--danger-hover);
}

input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    min-width: 18px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    cursor: pointer;
    position: relative;
    display: inline-block;
    vertical-align: middle;
}

input[type="checkbox"]:hover {
    border-color: var(--border-focus);
}

input[type="checkbox"]:checked {
    background: var(--text-main);
    border-color: var(--text-main);
}

input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 1px;
    width: 5px;
    height: 9px;
    border: solid var(--bg-color);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.search-box {
    display: flex;
    flex: 1;
    min-width: 200px;
    max-width: 350px;
}

.search-box input {
    flex: 1;
    min-width: 0;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-right: none;
    color: var(--text-main);
    padding: 8px 12px;
    font-size: 12px;
    outline: none;
}

.breadcrumbs {
    padding: 10px 14px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
    font-size: 13px;
    font-family: monospace;
    white-space: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
}
.breadcrumbs::-webkit-scrollbar { display: none; }

.breadcrumbs span.drag-target {
    background: #333;
    outline: 1px dashed #fff;
}

.file-list-container {
    width: 100%;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
}

.file-list-header, .file-row {
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr) 120px 180px;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.file-list-header {
    background: var(--panel-bg);
    font-size: 11px;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: bold;
    border-bottom: 2px solid var(--border-color);
}

.file-list-header > div, .file-row > div {
    padding: 10px 12px;
}

.file-list-header .sortable {
    cursor: pointer;
}

.file-list-header .sortable:hover {
    color: var(--text-main);
}

.file-row {
    font-size: 13px;
    background: var(--bg-color);
}

.file-row:hover {
    background-color: var(--hover-bg);
}

.file-row.selected {
    background-color: #222222;
}

.file-row.drag-target {
    outline: 1px dashed #ffffff;
    background-color: #2a2a2a;
}

.file-row:last-child {
    border-bottom: none;
}

.col-checkbox { text-align: center; }
.col-size { font-family: monospace; color: var(--text-muted); }
.col-actions { display: flex; gap: 4px; justify-content: flex-end; }
.col-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.item-icon {
    display: inline-block;
    width: 45px;
    color: var(--text-muted);
    font-family: monospace;
}

.empty-state {
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 16px;
}

.modal {
    background: var(--panel-bg);
    border: 1px solid var(--border-focus);
    width: 90%;
    max-width: 400px;
    padding: 20px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-large {
    max-width: 1000px;
}

.modal-header {
    font-size: 13px;
    font-weight: bold;
    letter-spacing: 1px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.modal-body { margin-bottom: 20px; }

.modal-label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.modal-field {
    width: 100%;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px 10px;
    font-size: 13px;
    outline: none;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.context-menu {
    position: fixed;
    background: var(--panel-bg);
    border: 1px solid var(--border-focus);
    z-index: 2000;
    width: 160px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.context-menu-item {
    padding: 10px 14px;
    font-size: 12px;
    cursor: pointer;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
}

.context-menu-item:last-child { border-bottom: none; }
.context-menu-item:hover { background: var(--text-main); color: var(--bg-color); }
.context-menu-item.danger { color: var(--danger); }
.context-menu-item.danger:hover { background: var(--danger-hover); color: #fff; }

.history-list {
    max-height: 500px;
    overflow-y: auto;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 12px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    padding: 4px;
}

.history-item {
    display: grid;
    grid-template-columns: 140px 90px 1fr;
    gap: 12px;
    align-items: start;
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
}

.history-item:hover { background: var(--hover-bg); }
.history-time { color: var(--text-muted); font-size: 11px; }

.history-act {
    display: inline-block;
    padding: 2px 6px;
    font-size: 10px;
    font-weight: 700;
    text-align: center;
    border: 1px solid var(--border-color);
    background: var(--panel-bg);
    color: var(--text-main);
}
.act-UPLOAD { border-color: #2e5b37; color: #4cd137; }
.act-DELETE { border-color: #632222; color: #e74c3c; }
.act-MOVE   { border-color: #584128; color: #e67e22; }
.act-RENAME { border-color: #584128; color: #f1c40f; }
.act-MKDIR  { border-color: #274862; color: #3498db; }

.history-details { word-break: break-all; line-height: 1.4; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-color); border-left: 1px solid var(--border-color); }
::-webkit-scrollbar-thumb { background: #333333; border: 1px solid var(--border-color); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

.upload-progress-panel {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 320px;
    max-width: calc(100vw - 40px);
    background: var(--panel-bg);
    border: 1px solid var(--border-focus);
    z-index: 3000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
}

.upload-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    font-size: 12px;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    font-family: monospace;
}

#uploadProgressList {
    max-height: 240px;
    overflow-y: auto;
    padding: 6px;
}

.upload-progress-item {
    display: grid;
    grid-template-columns: 1fr 40px;
    grid-template-areas:
        "name pct"
        "bar  bar";
    gap: 4px 8px;
    padding: 8px 6px;
    font-size: 12px;
}

.upload-progress-item:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.upload-progress-name {
    grid-area: name;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.upload-progress-pct {
    grid-area: pct;
    text-align: right;
    color: var(--text-muted);
    font-family: monospace;
    font-size: 11px;
}

.upload-progress-bar-track {
    grid-area: bar;
    height: 4px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
}

.upload-progress-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--text-main);
    transition: width 0.15s ease;
}

.upload-progress-item.upload-done .upload-progress-bar-fill { background: #4cd137; }
.upload-progress-item.upload-done .upload-progress-pct { color: #4cd137; }
.upload-progress-item.upload-error .upload-progress-bar-fill { background: var(--danger-hover); }
.upload-progress-item.upload-error .upload-progress-pct { color: var(--danger-hover); }

@media (max-width: 768px) {
    body { padding: 12px 8px; }
    .container { padding: 14px; }

    .header {
        flex-wrap: wrap;
    }
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    .status-badge { max-width: 55vw; }

    .toolbar { flex-direction: column; }

    .btn-group {
        display: grid;
        grid-template-columns: 1fr 1fr;
        width: 100%;
        gap: 8px;
    }
    .btn-group .btn {
        width: 100%;
        padding: 12px 8px;
        min-height: 44px;
    }
    .btn-group .btn:last-child:nth-child(odd) {
        grid-column: 1 / -1;
    }

    .search-box {
        max-width: 100%;
        width: 100%;
    }
    .search-box input { min-height: 44px; }
    .search-box .btn { min-height: 44px; padding: 10px 16px; }

    .file-list-header { display: none; }

    .file-row {
        grid-template-columns: 32px 1fr;
        grid-template-areas:
            "check name"
            ".     size"
            "actions actions";
        padding: 10px 8px;
        gap: 6px 0;
        row-gap: 4px;
    }

    .col-checkbox {
        grid-area: check;
        align-self: start;
        padding-top: 2px !important;
    }
    .col-name {
        grid-area: name;
        white-space: normal;
        word-break: break-word;
        padding: 0 !important;
    }
    .col-size {
        grid-area: size;
        padding: 0 !important;
        font-size: 12px;
    }
    .col-actions {
        grid-area: actions;
        justify-content: stretch;
        padding: 4px 0 0 !important;
        gap: 6px;
    }

    .col-actions .btn {
        padding: 10px 6px;
        flex: 1;
        text-align: center;
        min-height: 40px;
        font-size: 12px;
    }

    .history-item {
        grid-template-columns: 1fr;
        gap: 6px;
        padding: 12px 8px;
    }
    .history-time {
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 4px;
    }

    .modal { width: 100%; max-width: none; padding: 16px; }
    .modal-large { max-width: none; }
    .modal-actions .btn { flex: 1; min-height: 44px; }

    .context-menu {
        left: 0 !important;
        right: 0;
        bottom: 0;
        top: auto !important;
        width: 100%;
        border-left: none;
        border-right: none;
        border-bottom: none;
    }
    .context-menu-item {
        padding: 14px;
        font-size: 13px;
    }

    .upload-progress-panel {
        left: 8px;
        right: 8px;
        bottom: 8px;
        width: auto;
        max-width: none;
    }
}

@media (max-width: 400px) {
    .logo { font-size: 14px; letter-spacing: 1px; }
    .btn { font-size: 11px; padding: 10px 6px; }
    .status-badge { max-width: 45vw; }
    .col-actions .btn { font-size: 11px; padding: 8px 4px; }
}