/* ==========================================================================
   全局 MDI 布局框架 (Multiple Document Interface)
   ========================================================================== */

/* 1. 最外层容器 */
#app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* 1.1 自定义系统标题栏 (无边框窗口模式) */
#custom-titlebar {
    height: 42px;
    background-color: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: space-between;
    -webkit-app-region: drag; /* 允许拖拽 */
    border-bottom: 1px solid var(--border-color);
    position: relative;
    z-index: 10000;
    flex-shrink: 0;
    overflow: visible;
}

.titlebar-left {
    display: flex;
    align-items: center;
    height: 100%;
}

.titlebar-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 16px 0 12px;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 15px;
    letter-spacing: 0.5px;
    flex-shrink: 0;
    white-space: nowrap;
    -webkit-app-region: no-drag;
    user-select: none;
}

/* 品牌标识：与站点首页 .brand__mark 同一几何的矢量 LOGO */
.titlebar-logo__mark {
    --mark-stroke: #22d3ee;
    --mark-fill: #222639;
    width: 26px;
    height: 26px;
    flex-shrink: 0;
}

body.theme-light .titlebar-logo__mark {
    --mark-stroke: #027e97;
    --mark-fill: #ffffff;
}

.titlebar-logo__mark .mark-frame {
    fill: var(--mark-fill);
    stroke: var(--mark-stroke);
    stroke-width: 1.2;
}

.titlebar-logo__mark path {
    fill: none;
    stroke: var(--mark-stroke);
    stroke-width: 2.3;
    stroke-linecap: round;
}

/* 菜单栏 */
.custom-menu {
    display: flex;
    height: 100%;
    -webkit-app-region: no-drag;
}

.menu-item {
    padding: 0 16px;
    height: 100%;
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    position: relative;
    transition: all 0.15s;
    user-select: none;
    white-space: nowrap;
}

.menu-item:hover {
    color: var(--text-primary);
}

.menu-item.active {
    color: var(--color-brand);
    font-weight: 600;
}

.menu-item.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: var(--color-brand);
    border-radius: 1px;
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    min-width: 140px;
    display: none;
    flex-direction: column;
    z-index: 9999;
    padding: 4px 0;
    margin-top: -1px; /* 消除间隙防止 hover 失效 */
}

body.theme-light .dropdown-menu {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.menu-item:hover .dropdown-menu {
    display: flex;
}

.dropdown-item {
    padding: 10px 24px;
    white-space: nowrap;
    color: var(--text-primary);
    font-size: 14px;
    transition: background 0.1s;
}

.dropdown-item:hover {
    background-color: var(--bg-hover);
    color: var(--color-brand);
}

/* 标题栏右侧：窗口控制按钮 */
.titlebar-controls {
    display: flex;
    height: 100%;
    -webkit-app-region: no-drag;
}

.member-account {
    position: relative;
    display: flex;
    align-items: center;
    height: 100%;
}

.member-account__trigger {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 30px;
    max-width: 210px;
    padding: 0 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-panel);
    color: var(--text-primary);
    font: inherit;
    font-size: 12px;
    cursor: pointer;
}

.member-account__trigger:hover { background: var(--bg-hover); }
.member-account__trigger span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.member-account__chevron { color: var(--text-muted); }

.member-account__menu {
    position: absolute;
    z-index: 10020;
    top: 38px;
    right: 0;
    width: 250px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-panel);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
}

.member-account__menu[hidden] { display: none; }
.member-account__menu dl { margin: 0; }
.member-account__menu dl div { display: flex; justify-content: space-between; gap: 16px; padding: 7px 2px; }
.member-account__menu dt { color: var(--text-muted); font-size: 12px; }
.member-account__menu dd { margin: 0; color: var(--text-primary); font-size: 12px; text-align: right; }

.member-account__action,
.member-account__logout {
    width: 100%;
    height: 32px;
    margin-top: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
}

.member-account__action {
    color: var(--color-brand);
}

.member-account__action:hover,
.member-account__logout:hover { background: var(--bg-hover); }

.referral-dialog[hidden] { display: none; }
.referral-dialog {
    position: fixed;
    z-index: 20000;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 20px;
}
.referral-dialog__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.56);
}
.referral-dialog__panel {
    position: relative;
    width: min(360px, calc(100vw - 40px));
    padding: 18px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-panel);
    box-shadow: 0 16px 42px rgba(0, 0, 0, 0.34);
    color: var(--text-primary);
    text-align: center;
}
.referral-dialog__panel header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}
.referral-dialog__panel h2 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
}
.referral-dialog__close {
    width: 30px;
    height: 30px;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--text-secondary);
    font-size: 24px;
    line-height: 30px;
    cursor: pointer;
}
.referral-dialog__close:hover { color: var(--text-primary); }
.referral-dialog__qr {
    display: block;
    width: min(260px, 72vw);
    aspect-ratio: 1;
    margin: 0 auto 14px;
    border: 8px solid #fff;
    object-fit: contain;
    background: #fff;
}
.referral-dialog__panel p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.7;
}

.control-btn {
    width: 46px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.1s;
    user-select: none;
    position: relative;
}

.control-btn svg {
    width: 10px;
    height: 10px;
    fill: currentColor;
    shape-rendering: crispEdges;
}

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

.control-btn.theme-toggle {
    padding: 0;
    border: 0;
    background: transparent;
    flex-shrink: 0;
}

.control-btn.theme-toggle svg {
    width: 16px;
    height: 16px;
    fill: none;
    shape-rendering: auto;
}

.control-btn.theme-toggle:hover { background: var(--bg-hover); }
.control-btn.theme-toggle:focus-visible { outline: 2px solid var(--color-brand); outline-offset: -3px; }

.control-btn.close:hover {
    background-color: #e81123;
    color: white;
}

/* 2. 顶部原生菜单下方 - 全局 Tab 标签栏 */
#global-tab-bar {
    height: 38px;
    background: var(--bg-main);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 12px;
    gap: 4px;
    overflow-x: auto;
    overflow-y: hidden;
    user-select: none;
    scrollbar-width: none;
}

/* 隐藏 Tab 栏的滚动条 */
#global-tab-bar::-webkit-scrollbar {
    display: none;
}

.tab-item {
    height: 28px;
    min-width: auto;
    max-width: none;
    padding: 6px 28px 6px 16px;
    margin-right: 0;
    margin-top: 0;
    background: transparent;
    border: none;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    position: relative;
    transition: all 0.15s;
    white-space: nowrap;
}

.tab-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.tab-item.active {
    background: var(--bg-active);
    color: var(--color-brand);
    font-weight: 500;
    border: none;
    border-top: none;
    z-index: 1;
}

.tab-item .tab-icon {
    font-size: 14px;
}

.tab-item .tab-close {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    opacity: 0;
    transition: all 0.15s;
    color: var(--text-muted);
    margin-left: 2px;
}

.tab-item:hover .tab-close {
    opacity: 0.6;
}

.tab-item .tab-close:hover {
    opacity: 1;
    background: var(--color-up);
    color: white;
}

.tab-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    pointer-events: none;
    text-align: center;
}

.tab-close {
    width: 18px;
    height: 18px;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    right: 8px;
    top: 50%;
    margin-left: 0;
    opacity: 0;
    font-size: 13px;
    font-weight: bold;
    transition: opacity 0.15s, background-color 0.15s, color 0.15s, transform 0.15s;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.tab-item:hover .tab-close {
    opacity: 0.6;
}

.tab-close:hover {
    background-color: var(--color-up);
    color: white;
    opacity: 1;
    transform: translateY(-50%) scale(1.1);
}

/* 不可关闭的标签（如主页）隐藏关闭按钮 */
.tab-item.unclosable .tab-close {
    display: none;
}

/* 3. 功能工作区 (Tab Content Container) */
#workspace-container {
    flex: 1;
    position: relative;
    background-color: var(--bg-panel);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* 每个 Tab 对应的视图，通过 z-index 或 display 控制显示隐藏 */
.tab-view {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
}

.tab-view.active {
    display: block; /* 或者使用 flex */
}

/* iframe 视图容器 */
.tab-iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}