:root {
    --tab-font-family: -apple-system, 'Segoe UI', roboto, oxygen-sans, ubuntu, cantarell, 'Helvetica Neue', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
    --tab-font-size: 12px;
    --tab-transition: background-color 200ms ease-out, color 200ms ease-out;
    --tab-cursor: pointer;
    --tab-color: #7f8792;
    --tab-background: #EFF0F4;
    --tab-active-color: #222529;
    --tab-active-background: #FFFFFF;
    --tab-close-color: #9DA3AC;
}

* {
    margin: 0;
    padding: 0;
}

html,
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    font-size: 16px;
    color: #333;
}

.app {
    display: flex;
    align-items: center;
}

.nav {
    font-family: var(--tab-font-family);
    font-feature-settings: 'clig', 'kern';
    flex: 1;
    width: 0;
    display: flex;
    cursor: default;
    background-color: var(--tab-background);
    -webkit-app-region: drag;
}

/* 导航按钮 */
.nav-controls {
    display: flex;
    align-items: center;
    margin-right: 12px;
    -webkit-app-region: none;
}

.nav-controls div {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 32px;
    height: 32px;
    cursor: pointer;
}

.nav-controls svg {
    width: 16px;
    height: 16px;
    color: var(--tab-active-color);
}

.nav-controls .disabled {
    cursor: not-allowed !important;
}

.nav-controls .disabled svg {
    opacity: 0.3;
}

/* 标签 */
.nav-tabs {
    min-width: 0;
    flex: 1;
    display: flex;
    gap: 8px;
    height: 35px;
    margin-top: 5px;
    user-select: none;
    overflow-x: auto;
    overflow-y: hidden;
}

.nav-tabs::-webkit-scrollbar {
    display: none;
}

.nav-tabs li {
    display: inline-flex;
    position: relative;
    box-sizing: border-box;
    align-items: center;
    height: calc(100% - 5px);
    padding: 7px 8px;
    min-width: 100px;
    max-width: 240px;
    scroll-margin: 12px;
    font-size: var(--tab-font-size);
    color: var(--tab-color);
    cursor: var(--tab-cursor);
    transition: var(--tab-transition);
    -webkit-app-region: none;
}

.nav-tabs li:first-child {
    border-left: none;
}


.nav-tabs li.active {
    color: var(--tab-active-color);
    background: var(--tab-active-background);
    border-radius: 4px;
}

.nav-tabs li.active .tab-icon.background {
    background-image: url(../image/link_normal_selected_icon.png);
}


.nav-tabs li:not(.active)::after {
    position: absolute;
    right: 0;
    width: 1px;
    height: 16px;
    background: rgba(0, 0, 0, 0.08);
    content: '';
}

.nav-tabs li:not(.active):last-child::after {
    content: none;
}

/* 浏览器打开 */
.nav-browser {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    height: 40px;
    padding: 0 14px;
    margin: 0 2px;
    cursor: pointer;
    background-color: var(--tab-background);
    -webkit-app-region: none;
}

.nav-browser span {
    display: inline-block;
    width: 18px;
    height: 18px;
    background-size: cover;
    background-image: url(../image/link_normal_selected_icon.png);
}

/* 图标 */
.tab-icon {
    display: inline-block;
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    background-size: cover;
}

.tab-icon.background {
    background-image: url(../image/link_normal_icon.png);
}

.tab-icon.loading {
    background-image: none !important;
}

.tab-icon .tab-icon-loading {
    width: 18px;
    height: 18px;
    border: 2px solid #eeeeee;
    border-bottom-color: #84C56A;
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: spin 0.75s linear infinite;
}

.tab-icon:not(.loading) .tab-icon-loading {
    display: none;
}

.tab-icon img {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

@keyframes spin {
    0% {
        transform: scale(0.8) rotate(0deg);
    }

    100% {
        transform: scale(0.8) rotate(360deg);
    }
}

/* 标题 */
.tab-title {
    display: inline-block;
    flex: 1;
    margin: 0 8px;
    overflow: hidden;
    line-height: 150%;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 关闭 */
.tab-close {
    display: inline-block;
    width: 14px;
    height: 14px;
    margin-right: 2px;
    position: relative;
}

.tab-close::after,
.tab-close::before {
    position: absolute;
    top: 50%;
    right: 50%;
    transform: translate(50%, -50%) scale(0.9) rotate(45deg);
    content: "";
    width: 2px;
    height: 11px;
    border-radius: 3px;
    background-color: var(--tab-close-color);
}

.tab-close::before {
    transform: translate(50%, -50%) scale(0.9) rotate(-45deg);
}

/* 不同平台样式 */
body.win32 .nav {
    padding-left: 8px;
    padding-right: 140px;
}

body.darwin .nav {
    padding-left: 76px;
}

body.darwin.full-screen .nav {
    padding-left: 8px;
}

/* 暗黑模式 */
@media (prefers-color-scheme: dark) {
    :root {
        --tab-color: #C5C5C5;
        --tab-background: #3B3B3D;
        --tab-active-color: #E1E1E1;
        --tab-active-background: #575757;
        --tab-close-color: #E3E3E3;
    }

    .nav-tabs li.active .tab-icon.background {
        background-image: url(../image/dark/link_normal_selected_icon.png);
    }

    .nav-browser span {
        background-image: url(../image/dark/link_normal_selected_icon.png);
    }

    .tab-icon.background {
        background-image: url(../image/dark/link_normal_icon.png);
    }
}