/* ============================================
   Base Reset & Variables
   ============================================ */
:root {
    --primary: #2b6cbe;
    --primary-light: #eaf2fb;
    --primary-dark: #1d4f8b;
    --danger: #c0392b;
    --danger-light: #fdedec;
    --text: #2c3e50;
    --text-muted: #7f8c9b;
    --bg: #eef1f5;
    --bg-white: #ffffff;
    --border: #dce1e8;
    --shadow: 0 2px 8px rgba(0,0,0,0.07);
    --radius: 6px;
}

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

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.5;
    min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============================================
   Top Bar
   ============================================ */
.topbar {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
    padding: 0 28px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.topbar-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: 0.5px;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.current-user {
    color: var(--text-muted);
    font-size: 13px;
}

.logout-link {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
}

/* ============================================
   Workspace: 两个部分并列
   ============================================ */
.workspace {
    max-width: 1160px;
    margin: 0 auto;
    padding: 20px 28px;
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 20px;
    align-items: start;
}

/* ============================================
   Panel (通用)
   ============================================ */
.panel {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px 0;
    gap: 12px;
}

.panel-header h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
}

.panel-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ============================================
   jQuery UI Override: Theme Colors
   ============================================ */
.ui-widget {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
}

/* Buttons */
.ui-button {
    border-radius: 4px !important;
    font-size: 13px !important;
    padding: 6px 16px !important;
    outline: none !important;
    border-color: var(--border) !important;
    background: #fff !important;
    color: var(--text) !important;
    transition: all 0.15s !important;
}

.ui-button:hover {
    border-color: var(--primary) !important;
    background: var(--primary-light) !important;
    color: var(--primary) !important;
}

.ui-button:active {
    transform: scale(0.97);
}

/* Primary button style */
.ui-button.primary-btn {
    background: var(--primary) !important;
    border-color: var(--primary) !important;
    color: #fff !important;
    font-weight: 600;
}

.ui-button.primary-btn:hover {
    background: var(--primary-dark) !important;
    border-color: var(--primary-dark) !important;
    color: #fff !important;
}

/* Danger button style */
.ui-button.danger-btn {
    background: var(--danger) !important;
    border-color: var(--danger) !important;
    color: #fff !important;
}

.ui-button.danger-btn:hover {
    background: #a93226 !important;
    border-color: #a93226 !important;
    color: #fff !important;
}

/* ============================================
   jQuery UI Override: Tabs (上传区域)
   ============================================ */
.panel-upload .ui-tabs {
    padding: 0;
    border: none;
    background: transparent;
}

.panel-upload .ui-tabs-nav {
    display: flex;
    border: none;
    border-bottom: 2px solid var(--border);
    background: transparent;
    padding: 0 20px;
    border-radius: 0;
}

.panel-upload .ui-tabs-nav li {
    margin: 0;
    border: none;
    background: transparent;
    list-style: none;
}

.panel-upload .ui-tabs-nav li a {
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    border: none;
    outline: none;
    float: none;
}

.panel-upload .ui-tabs-nav li.ui-tabs-active {
    margin-bottom: -2px;
}

.panel-upload .ui-tabs-nav li.ui-tabs-active a {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
    background: transparent;
}

.panel-upload .ui-tabs-nav li.ui-state-hover a {
    color: var(--primary);
}

.panel-upload .ui-tabs-panel {
    padding: 20px;
    border: none;
    background: transparent;
}

/* ============================================
   Upload Dropzone
   ============================================ */
.upload-dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 120px;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    padding: 20px;
}

.upload-dropzone:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-dropzone input {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    top: 0;
    left: 0;
}

.dropzone-icon {
    font-size: 32px;
    color: var(--text-muted);
    line-height: 1;
}

.upload-dropzone:hover .dropzone-icon {
    color: var(--primary);
}

.dropzone-text {
    font-size: 14px;
    color: var(--text-muted);
}

.upload-dropzone:hover .dropzone-text {
    color: var(--primary);
}

.upload-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.file-hint {
    font-size: 12px;
    color: var(--text-muted);
    min-height: 18px;
    text-align: center;
    word-break: break-all;
}

.upload-progress {
    width: 120px;
    height: 18px;
}

/* ============================================
   jQuery UI Override: Progressbar
   ============================================ */
.ui-progressbar {
    border-radius: 10px;
    height: 18px;
    border-color: var(--border);
    background: #f0f2f5;
}

.ui-progressbar .ui-progressbar-value {
    background: var(--primary);
    border-radius: 10px;
    margin: 0;
    border: none;
}

/* ============================================
   Panel: 文件列表
   ============================================ */
.panel-files .panel-header {
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.panel-files {
    overflow: hidden;
}

.file-count {
    font-size: 12px;
    color: var(--text-muted);
}

/* ============================================
   File Table Header
   ============================================ */
.file-table-header {
    display: grid;
    grid-template-columns: 1fr 90px 150px 130px;
    padding: 10px 20px;
    background: #f8f9fb;
    border-bottom: 1px solid var(--border);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.3px;
}

.fc-actions {
    text-align: right;
}

/* ============================================
   File List Body
   ============================================ */
.file-list-body {
    min-height: 200px;
}

/* ============================================
   File Item Rows
   ============================================ */
.file-item {
    display: grid;
    grid-template-columns: 1fr 90px 150px 130px;
    padding: 0 20px;
    height: 46px;
    align-items: center;
    border-bottom: 1px solid #f0f2f5;
    transition: background 0.12s;
}

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

.file-item:hover {
    background: #f5f8fd;
}

/* Name cell */
.name-cell {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
    overflow: hidden;
}

.file-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: #fff;
    font-weight: 700;
}

.file-icon.folder {
    background: #f5b342;
}

.file-icon.file {
    background: var(--primary);
}

.file-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
    color: var(--text);
}

/* Size cell */
.size-cell {
    font-size: 13px;
    color: var(--text-muted);
}

/* Date cell */
.date-cell {
    font-size: 13px;
    color: var(--text-muted);
}

/* Actions cell */
.actions-cell {
    display: flex;
    gap: 6px;
    justify-content: flex-end;
}

/* Download/Delete action buttons */
.actions-cell .ui-button {
    padding: 4px 10px !important;
    font-size: 12px !important;
    min-height: 28px;
}

/* ============================================
   Folder Collapse
   ============================================ */
.collapse-toggle {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 10px;
    color: #aaa;
    user-select: none;
    transition: transform 0.2s;
    border-radius: 3px;
}

.collapse-toggle:hover {
    background: #e8ecf1;
    color: #666;
}

.collapse-toggle.open {
    transform: rotate(90deg);
}

.folder-wrapper {}

.folder-children {
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.25s ease, opacity 0.2s ease;
}

.folder-children.open {
    opacity: 1;
}

/* Nesting indent */
.folder-children .file-item {
    padding-left: 44px;
}
.folder-children .folder-children .file-item {
    padding-left: 68px;
}
.folder-children .folder-children .folder-children .file-item {
    padding-left: 92px;
}

/* ============================================
   Empty & Loading States
   ============================================ */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-muted);
    gap: 10px;
    font-size: 14px;
}

.loading-state {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 50px 20px;
    color: var(--text-muted);
    gap: 10px;
    font-size: 14px;
}

/* ============================================
   jQuery UI Override: Dialog
   ============================================ */
.ui-dialog {
    border-radius: 8px !important;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15) !important;
    border: none !important;
    padding: 0 !important;
}

.ui-dialog .ui-dialog-titlebar {
    background: #fff;
    border: none;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    padding: 16px 20px;
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
}

.ui-dialog .ui-dialog-titlebar .ui-dialog-title {
    margin: 0;
}

.ui-dialog .ui-dialog-titlebar-close {
    width: 24px;
    height: 24px;
    margin: 0;
    right: 16px;
    top: 14px;
    background: none;
    border: none;
}

.ui-dialog .ui-dialog-titlebar-close .ui-icon-closethick {
    background: none;
    text-indent: 0;
    overflow: visible;
    font-size: 0;
}

.ui-dialog .ui-dialog-titlebar-close::after {
    content: "×";
    font-size: 20px;
    color: #999;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.ui-dialog .ui-dialog-titlebar-close:hover::after {
    color: #333;
}

.ui-dialog .ui-dialog-content {
    padding: 20px;
    font-size: 14px;
    color: var(--text);
    background: #fff;
}

.ui-dialog .ui-dialog-buttonpane {
    border: none;
    border-top: 1px solid var(--border);
    padding: 12px 20px;
    background: #fafbfc;
    margin: 0;
}

.ui-dialog .ui-dialog-buttonpane .ui-dialog-buttonset {
    float: none;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.ui-dialog .ui-dialog-buttonpane button {
    margin: 0;
}

/* ============================================
   Auth Pages
   ============================================ */
.page-auth {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.auth-shell {
    width: 380px;
    max-width: calc(100% - 32px);
}

.auth-panel {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: 0 4px 24px rgba(0,0,0,0.12);
    padding: 36px 32px 32px;
}

.auth-panel .auth-header {
    text-align: center;
    margin-bottom: 28px;
}

.auth-panel .auth-header h1 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.auth-panel .auth-header p {
    font-size: 13px;
    color: var(--text-muted);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.auth-form .field-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.auth-form .field-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

.auth-form .field-group input {
    width: 100%;
    height: 40px;
    padding: 0 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s;
}

.auth-form .field-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(43,108,190,0.1);
}

.auth-error {
    color: var(--danger);
    font-size: 13px;
    text-align: center;
    padding: 8px 12px;
    background: var(--danger-light);
    border-radius: 4px;
    display: none;
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-muted);
}

.auth-footer a {
    font-weight: 600;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 860px) {
    .workspace {
        grid-template-columns: 1fr;
        padding: 16px;
    }

    .file-table-header,
    .file-item {
        grid-template-columns: 1fr 70px 120px 100px;
    }
}

@media (max-width: 560px) {
    .file-table-header .fc-date,
    .file-item .date-cell {
        display: none;
    }

    .file-table-header,
    .file-item {
        grid-template-columns: 1fr 60px 80px;
    }

    .topbar {
        padding: 0 16px;
    }
}