:root {
    --bg-color: #0a0c10; /* 修改：更深的背景色 */
    --panel-bg-color: rgba(26, 31, 41, 0.65); /* 修改：更深的面板颜色和稍高的不透明度 */
    --modal-bg-color: rgba(26, 31, 41, 0.8); /* 修改：更深的模态框颜色和稍高的不透明度 */
    --border-color: rgba(139, 148, 158, 0.2);
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent-color: #38bdf8;
    --danger-color: #f85149;
    --highlight-bg: rgba(56, 189, 248, 0.1);
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --border-radius: 6px;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

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

body {
    color: var(--text-primary);
    font-family: var(--font-family);
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 15% 15%, rgba(0, 170, 255, 0.1) 0%, transparent 30%), radial-gradient(circle at 85% 80%, rgba(244, 114, 182, 0.08) 0%, transparent 35%);
    line-height: 1.5;
    height: 100vh;
    /* 关键修改：从body中移除 overflow: hidden; */
}

.page-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 0.5rem;
    gap: 1rem;
    /* 关键补充：将 overflow: hidden 移到这里，以固定主布局 */
    overflow: hidden;
}

.page-header {
    flex-shrink: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}

.page-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    white-space: nowrap;
}

.header-link {
    color: var(--text-primary);
    text-decoration: none;
}

#uptime-ticker {
    font-variant-numeric: tabular-nums;
    margin-left: 0.5rem;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

.portal-wrapper {
    display: flex;
    flex-grow: 1;
    gap: 1rem;
    min-height: 0;
}

.sidebar-panel, .main-content {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--panel-bg-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.sidebar-panel {
    flex: 0 0 280px;
    overflow-y: auto;
    padding: 0.5rem;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li a {
    display: flex;
    align-items: center;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    text-decoration: none;
    transition: background-color 0.2s, color 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
}

.sidebar-nav li a:hover {
    background-color: var(--highlight-bg);
    color: var(--text-primary);
}

.sidebar-nav li a.active {
    background-color: var(--highlight-bg);
    color: var(--text-primary);
    font-weight: 500;
}

.sidebar-nav li a .folder-icon {
    width: 20px;
    height: 20px;
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.sidebar-nav li a .chevron {
    width: 16px;
    height: 16px;
    margin-left: auto;
    transition: transform 0.2s ease-in-out;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.sidebar-nav li.open > a > .chevron {
    transform: rotate(90deg);
}

.sidebar-nav li > ul {
    display: none;
    padding-left: 1.25rem;
}

.sidebar-nav li.open > ul {
    display: block;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

.content-panel {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.breadcrumbs {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    white-space: nowrap;
    overflow-x: auto;
}

.breadcrumbs a {
    color: var(--text-secondary);
    text-decoration: none;
}

.breadcrumbs a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.breadcrumbs span {
    margin: 0 0.5rem;
    color: var(--text-secondary);
}

.table-container {
    overflow-y: auto;
    flex-grow: 1;
}

table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

th, td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    text-align: left;
}

th {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    background-color: var(--panel-bg-color);
    position: sticky;
    top: 0;
    z-index: 10;
    border-bottom: 1px solid var(--border-color);
}

table col:nth-child(1) { width: 50%; }
table col:nth-child(2) { width: 20%; }
table col:nth-child(3) { width: 15%; }
table col:nth-child(4) { width: 15%; }

.cell-content {
    display: flex;
    align-items: center;
}

.align-right {
    justify-content: flex-end;
}

.justify-center {
    justify-content: center;
}

tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

tbody tr:last-child {
    border-bottom: none;
}

tbody tr:hover {
    background-color: var(--highlight-bg);
}

.file-icon {
    width: 20px;
    height: 20px;
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.folder-icon { color: var(--accent-color); }
.pdf-icon { color: #ff6b6b; }
.docx-icon { color: #368dff; }
.xlsx-icon { color: #107c41; }
.pptx-icon { color: #d35400; }
.image-icon { color: #4caf50; }
.video-icon { color: #e91e63; }
.other-icon { color: #8b949e; }

.file-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
}

.file-link:hover {
    color: var(--accent-color);
}

.file-link span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    background-color: rgba(56, 189, 248, 0.05);
    transition: background-color 0.2s;
}

.action-btn:hover {
    background-color: rgba(56, 189, 248, 0.15);
}

.action-btn svg {
    width: 16px;
    height: 16px;
}

.action-button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, color 0.2s;
}

.action-button:hover {
    color: var(--danger-color);
    background-color: rgba(248, 81, 73, 0.1);
}

.empty-message {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(5px);
    z-index: 10000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

.modal-dialog {
    background: var(--modal-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    width: 90%;
    max-width: 400px;
    box-shadow: var(--shadow);
    transform: scale(0.95);
    transition: transform 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.modal-overlay.visible .modal-dialog {
    transform: scale(1);
}

.modal-dialog h3 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.modal-dialog p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.modal-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.modal-input {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.6rem 0.8rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.modal-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.3);
}

.modal-button {
    padding: 0.6rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--accent-color);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: var(--accent-color);
    color: #0d1117;
}

.modal-button:hover {
    filter: brightness(1.1);
}

.modal-dialog .error-message {
    color: var(--danger-color);
    font-size: 0.9rem;
    min-height: 1.2em;
    visibility: hidden;
    margin-top: 0.5rem;
}

.modal-dialog .error-message.visible {
    visibility: visible;
}

#context-menu, #context-menu-sidebar {
    display: none;
    position: fixed;
    z-index: 100;
    background-color: var(--modal-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    padding: 0.5rem;
    min-width: 180px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.5rem 1rem;
    background: none;
    border: none;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    white-space: nowrap;
    border-radius: var(--border-radius);
}

.context-menu-item:hover {
    background-color: var(--accent-color);
    color: #0d1117;
}

/* MODIFICATION: Larger and colorful context menu icons */
.context-menu-item svg {
    width: 18px;
    height: 18px;
    transition: color 0.2s;
}

#context-rename svg, #sidebar-context-rename svg { color: #66d9ff; }
#context-copy-link svg { color: #66ffc2; }
#context-delete svg, #sidebar-context-delete svg { color: #ff8282; }
#context-create-folder svg, #sidebar-context-new-folder svg { color: #ffb366; }
#context-upload svg { color: #ff8dff; }
#context-general-actions .context-menu-item[data-type="docx"] svg { color: #ffc966; }
#context-general-actions .context-menu-item[data-type="xlsx"] svg { color: #7ed6df; }
#context-general-actions .context-menu-item[data-type="pptx"] svg { color: #a78bfa; }

.context-menu-item:hover svg {
    color: #0d1117;
}

.context-menu-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 0.5rem 0;
}

#drop-zone {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(10px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

#drop-zone.visible {
    display: flex;
    opacity: 1;
}

.drop-indicator {
    border: 2px dashed var(--accent-color);
    border-radius: 12px;
    padding: 3rem 4rem;
    text-align: center;
    color: #fff;
    background-color: var(--highlight-bg);
}

.drop-indicator svg {
    width: 60px;
    height: 60px;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.drop-indicator h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
    .sidebar-panel {
        display: none;
    }
    .page-container {
        padding: 0.5rem;
    }
    .page-header {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    .header-actions {
        width: 100%;
        justify-content: space-around;
    }
    .action-btn span {
        display: none;
    }
    .action-btn {
        padding: 0.5rem;
        flex-grow: 1;
        justify-content: center;
    }
    .hide-on-mobile {
        display: none !important;
    }
    .breadcrumbs {
        padding: 0.5rem;
    }
    th, td {
        padding: 0.5rem;
    }
    thead {
        display: none;
    }
    tbody, tr, td {
        display: block;
    }
    tr.item-row {
        display: flex;
        align-items: center;
        padding: 0.5rem 0;
    }
    td[data-label="名称"] {
        flex: 1;
        min-width: 0;
    }
    td[data-label="操作"] {
        flex-shrink: 0;
    }
    td[data-label="修改日期"], td[data-label="大小"] {
        display: none;
    }
}