/*!
 * IELTS Reading Studio — 界面样式
 * 作者 / Author: aliakata
 *
 * 视觉参考官方站点的浅色信息面板：左侧固定导航 + 右侧内容区、
 * 大字号数据卡片、筛选胶囊、细线柱状趋势图。
 */

:root {
    --blue: #4d6bfe;
    --blue-dark: #3b56e0;
    --blue-soft: #eef1ff;
    --blue-line: #dfe4ff;
    --ink: #1b1f26;
    --ink-2: #4a5261;
    --ink-3: #8b93a2;
    --ink-4: #aeb5c0;
    --line: #e7e9ee;
    --line-soft: #f0f1f4;
    --bg: #f5f6f8;
    --surface: #ffffff;
    --surface-2: #fafbfc;
    --ok: #0f9d6e;
    --ok-soft: #e8f7f1;
    --bad: #d14343;
    --bad-soft: #fdeeee;
    --warn: #c07b11;
    --warn-soft: #fdf5e6;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 10px 28px rgba(16, 24, 40, .05);
    --sidebar: 244px;
    --font: "Segoe UI", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--ink);
    font-size: 14px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

button, input, select, textarea { font-family: inherit; }

code, .num {
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

/* ------------------------------------------------------------------ *
 * 布局
 * ------------------------------------------------------------------ */

.layout {
    display: grid;
    grid-template-columns: var(--sidebar) minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    background: var(--surface);
    border-right: 1px solid var(--line);
    padding: 22px 16px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 2px 6px 0;
}

.brand img {
    width: 34px;
    height: 34px;
    border-radius: 10px;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-size: 16px; font-weight: 700; letter-spacing: -.2px; }
.brand-sub { font-size: 11px; color: var(--ink-3); letter-spacing: .4px; }

.nav { display: flex; flex-direction: column; gap: 3px; }

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-2);
    text-decoration: none;
    cursor: pointer;
    border: none;
    background: transparent;
    text-align: left;
    transition: background .15s ease, color .15s ease;
}

.nav-item .ico {
    width: 18px;
    height: 18px;
    flex: 0 0 18px;
    color: var(--ink-3);
}

.nav-item:hover { background: var(--surface-2); color: var(--ink); }
.nav-item.active { background: var(--blue-soft); color: var(--blue-dark); }
.nav-item.active .ico { color: var(--blue); }

.nav-sep {
    margin: 12px 12px 6px;
    font-size: 11px;
    letter-spacing: .8px;
    color: var(--ink-4);
    text-transform: uppercase;
}

.nav-sub {
    padding-left: 14px;
    font-size: 13.5px;
}

.nav-sub .dot-purple,
.nav-sub .dot-blue {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex: 0 0 8px;
}

.nav-sub .dot-purple { background: linear-gradient(135deg, #8b6bff, #7048c8); }
.nav-sub .dot-blue { background: linear-gradient(135deg, #7c93ff, #4d6bfe); }

.nav-sub .nav-count {
    margin-left: auto;
    font-size: 11.5px;
    font-weight: 600;
    color: var(--ink-4);
    background: var(--line-soft);
    border-radius: 999px;
    padding: 1px 7px;
    font-variant-numeric: tabular-nums;
}

.sidebar-foot {
    margin-top: auto;
    padding: 12px;
    border-radius: 12px;
    background: var(--surface-2);
    border: 1px solid var(--line-soft);
    font-size: 12px;
    color: var(--ink-3);
    line-height: 1.7;
}

.sidebar-foot b { color: var(--ink); }

.main {
    padding: 26px 34px 70px;
    max-width: 1360px;
    width: 100%;
}

.page { display: none; }
.page.active { display: block; animation: fade .2s ease; }

@keyframes fade {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ------------------------------------------------------------------ *
 * 页头
 * ------------------------------------------------------------------ */

.page-head {
    display: flex;
    align-items: flex-end;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 6px;
}

.page-title {
    margin: 0;
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -.5px;
}

.page-desc {
    margin: 6px 0 18px;
    color: var(--ink-3);
    font-size: 13px;
}

.page-head .head-actions {
    margin-left: auto;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ------------------------------------------------------------------ *
 * 按钮
 * ------------------------------------------------------------------ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--ink-2);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    padding: 8px 14px;
    text-decoration: none;
    transition: all .15s ease;
}

.btn:hover { border-color: #d5d9e2; color: var(--ink); background: var(--surface-2); }

.btn-primary {
    background: var(--blue);
    border-color: var(--blue);
    color: #fff;
}

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

.btn-sm { padding: 6px 11px; font-size: 12.5px; border-radius: 9px; }

.btn-danger:hover { color: var(--bad); border-color: #f2cccc; background: var(--bad-soft); }

/* ------------------------------------------------------------------ *
 * 数据卡片
 * ------------------------------------------------------------------ */

.metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(212px, 1fr));
    gap: 14px;
    margin-bottom: 22px;
}

.metric {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--line-soft);
    padding: 18px 20px;
    box-shadow: var(--shadow);
}

.metric-label {
    font-size: 13px;
    color: var(--ink-2);
    display: flex;
    align-items: center;
    gap: 5px;
    margin-bottom: 12px;
}

.metric-value {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -.8px;
    line-height: 1.05;
    font-variant-numeric: tabular-nums;
}

.metric-value .unit {
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-3);
    margin-left: 6px;
    letter-spacing: 0;
}

.metric-foot {
    margin-top: 8px;
    font-size: 12px;
    color: var(--ink-3);
}

.metric-foot .up { color: var(--ok); font-weight: 600; }
.metric-foot .down { color: var(--bad); font-weight: 600; }

/* ------------------------------------------------------------------ *
 * 面板 / 工具条
 * ------------------------------------------------------------------ */

.panel {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--line-soft);
    box-shadow: var(--shadow);
    padding: 18px 20px;
    margin-bottom: 20px;
}

.panel-head {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.panel-title {
    font-size: 15px;
    font-weight: 700;
    margin: 0;
}

.panel-title .sub {
    font-weight: 500;
    color: var(--ink-3);
    font-size: 13px;
    margin-left: 8px;
}

.panel-head .spacer { margin-left: auto; }

.toolbar-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.seg {
    display: inline-flex;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 3px;
    gap: 2px;
}

.seg button {
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--ink-2);
    padding: 6px 12px;
    border-radius: 9px;
    transition: all .14s ease;
}

.seg button.active { background: var(--ink); color: #fff; }
.seg.soft button.active { background: var(--blue-soft); color: var(--blue-dark); }

.field {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 7px 12px;
    font-size: 13px;
    color: var(--ink-3);
}

.field select,
.field input[type=search] {
    border: none;
    background: transparent;
    font-size: 13px;
    font-weight: 600;
    color: var(--ink);
    outline: none;
    min-width: 96px;
}

.field input[type=search] { min-width: 190px; }

/* ------------------------------------------------------------------ *
 * 趋势图
 * ------------------------------------------------------------------ */

.chart {
    position: relative;
    padding: 4px 0 0;
}

.chart-grid {
    position: relative;
    height: 190px;
    border-bottom: 1px solid var(--line);
}

.chart-lines {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.chart-line {
    position: absolute;
    left: 46px;
    right: 0;
    border-top: 1px dashed var(--line);
    font-size: 11px;
    color: var(--ink-4);
}

.chart-line span {
    position: absolute;
    left: -46px;
    top: -9px;
    width: 40px;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.chart-bars {
    position: absolute;
    left: 46px;
    right: 0;
    bottom: 0;
    top: 0;
    display: flex;
    align-items: flex-end;
    gap: 2px;
}

.chart-bar {
    flex: 1 1 0;
    min-width: 0;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    height: 100%;
    position: relative;
    border-radius: 5px 5px 0 0;
    transition: background .14s ease;
}

.chart-bar i {
    display: block;
    width: 68%;
    max-width: 22px;
    min-height: 2px;
    background: linear-gradient(180deg, #7c93ff, var(--blue));
    border-radius: 5px 5px 0 0;
    transition: height .3s ease;
}

.chart-bar.has-value i { background: linear-gradient(180deg, #7c93ff, var(--blue)); }
.chart-bar.is-empty i { background: #e9ecf5; min-height: 3px; }
.chart-bar:hover { background: rgba(77, 107, 254, .07); }

.chart-axis {
    display: flex;
    justify-content: space-between;
    margin: 8px 0 0 46px;
    font-size: 11px;
    color: var(--ink-4);
    font-variant-numeric: tabular-nums;
}

.chart-legend {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--ink-3);
    margin-top: 10px;
    padding-left: 46px;
}

.dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 6px;
    vertical-align: 1px;
}

.dot-blue { background: var(--blue); }
.dot-grey { background: #e9ecf5; }

/* ------------------------------------------------------------------ *
 * 题库列表
 * ------------------------------------------------------------------ */

.book-block { margin-bottom: 18px; }

.book-head {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 2px 12px;
    flex-wrap: wrap;
}

.book-name {
    font-size: 15px;
    font-weight: 700;
}

.book-progress {
    flex: 1 1 160px;
    max-width: 240px;
    height: 6px;
    background: var(--line-soft);
    border-radius: 999px;
    overflow: hidden;
}

.book-progress i {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, #7c93ff, var(--blue));
    border-radius: 999px;
}

.book-count { font-size: 12.5px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.book-head .spacer { margin-left: auto; }

.test-row {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 10px;
    padding: 10px 0;
    border-top: 1px solid var(--line-soft);
    align-items: start;
}

.test-label {
    font-size: 12.5px;
    font-weight: 700;
    color: var(--ink-2);
    padding-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.test-label a {
    color: var(--blue);
    text-decoration: none;
    font-weight: 600;
    font-size: 11.5px;
    white-space: nowrap;
}

.test-label a:hover { color: var(--blue-dark); text-decoration: underline; }

.papers {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(272px, 1fr));
    gap: 10px;
}

.paper-card {
    background: var(--surface-2);
    border: 1px solid var(--line-soft);
    border-radius: 12px;
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: all .15s ease;
}

.paper-card:hover {
    border-color: var(--blue-line);
    background: #fff;
    box-shadow: 0 6px 18px rgba(77, 107, 254, .08);
    transform: translateY(-1px);
}

.paper-top {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11.5px;
    color: var(--ink-3);
}

.tag {
    font-size: 11px;
    font-weight: 700;
    border-radius: 999px;
    padding: 2px 8px;
    background: var(--blue-soft);
    color: var(--blue-dark);
    letter-spacing: .2px;
}

.tag.p1 { background: #eaf3ff; color: #1d6fd0; }
.tag.p2 { background: #eef1ff; color: var(--blue-dark); }
.tag.p3 { background: #f3edff; color: #7048c8; }
.tag.grey { background: var(--line-soft); color: var(--ink-3); }
.tag.ok { background: var(--ok-soft); color: var(--ok); }
.tag.warn { background: var(--warn-soft); color: var(--warn); }
.tag.bad { background: var(--bad-soft); color: var(--bad); }

.paper-title {
    font-size: 14.5px;
    font-weight: 600;
    line-height: 1.45;
    color: var(--ink);
    text-decoration: none;
    display: block;
}

.paper-title:hover { color: var(--blue); }

.paper-zh {
    font-size: 12.5px;
    color: var(--ink-3);
}

.paper-bottom {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: auto;
}

.paper-score {
    font-size: 12.5px;
    color: var(--ink-3);
    font-variant-numeric: tabular-nums;
}

.paper-score b {
    color: var(--ink);
    font-size: 14px;
}

.paper-bottom .spacer { margin-left: auto; }

/* ------------------------------------------------------------------ *
 * 专栏卡片 / 专栏切换
 * ------------------------------------------------------------------ */

.column-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 14px;
    margin-bottom: 20px;
}

.column-card {
    display: block;
    background: var(--surface);
    border: 1px solid var(--line-soft);
    border-radius: var(--radius);
    padding: 18px 20px;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow);
    transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
    position: relative;
    overflow: hidden;
}

.column-card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--blue);
}

.column-card.column-jijing::before { background: linear-gradient(180deg, #8b6bff, #7048c8); }

.column-card:hover {
    transform: translateY(-2px);
    border-color: var(--blue-line);
    box-shadow: 0 12px 30px rgba(77, 107, 254, .12);
}

.column-card-head {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 6px;
}

.column-card-name {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -.2px;
}

.column-card-enter {
    margin-left: auto;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--blue);
}

.column-card-desc {
    font-size: 12.5px;
    color: var(--ink-3);
    margin-bottom: 14px;
}

.column-card-stats {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
    font-size: 12px;
    color: var(--ink-3);
    margin-bottom: 12px;
}

.column-card-stats b {
    display: block;
    font-size: 19px;
    color: var(--ink);
    font-variant-numeric: tabular-nums;
    letter-spacing: -.4px;
}

.column-card .book-progress {
    max-width: none;
    height: 6px;
}

.column-tabs {
    display: inline-flex;
    gap: 4px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 4px;
    margin-bottom: 16px;
}

.column-tabs button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-family: inherit;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--ink-2);
    padding: 8px 16px;
    border-radius: 11px;
    transition: all .15s ease;
}

.column-tabs button .ct-count {
    font-size: 11.5px;
    font-weight: 600;
    color: var(--ink-3);
    background: var(--line-soft);
    border-radius: 999px;
    padding: 1px 8px;
}

.column-tabs button:hover { background: var(--surface-2); }

.column-tabs button.active {
    background: var(--blue);
    color: #fff;
}

.column-tabs button.active .ct-count {
    background: rgba(255, 255, 255, .22);
    color: #fff;
}

.progress-group-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--ink);
    padding: 16px 2px 4px;
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.progress-group-title .sub {
    font-size: 12px;
    font-weight: 500;
    color: var(--ink-3);
}

/* ------------------------------------------------------------------ *
 * 首页时长滑块
 * ------------------------------------------------------------------ */

.trainer-panel .panel-head {
    margin-bottom: 12px;
}

.trainer-wide {
    display: flex;
    flex-direction: column;
    gap: 6px;
    border: none;
    background: transparent;
    padding: 0;
    min-width: 0;
}

.trainer-wide .trainer-track::before {
    left: 5px;
    right: 5px;
    background: #e9ecf5;
    height: 6px;
}

.trainer-wide .trainer-track i {
    height: 6px;
}

.trainer-wide input[type=range].trainer-input {
    height: 22px;
}

.trainer-wide input[type=range].trainer-input::-webkit-slider-runnable-track {
    height: 22px;
}

.trainer-wide input[type=range].trainer-input::-webkit-slider-thumb {
    width: 18px;
    height: 18px;
    border-width: 3px;
    margin-top: 2px;
}

.trainer-marks {
    display: flex;
    justify-content: space-between;
    padding: 0 2px;
    font-size: 11.5px;
    color: var(--ink-3);
    font-variant-numeric: tabular-nums;
}

.trainer-marks span {
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 7px;
    transition: all .14s ease;
}

.trainer-marks span:hover {
    color: var(--blue);
    background: var(--blue-soft);
}

.trainer-marks span.active {
    color: var(--blue-dark);
    background: var(--blue-soft);
    font-weight: 700;
}

/* ------------------------------------------------------------------ *
 * 简洁模式：只保留最必要的入口
 * ------------------------------------------------------------------ */

.layout-toggle {
    padding: 2px;
}

.layout-toggle button {
    padding: 6px 12px;
    font-size: 12.5px;
    border-radius: 8px;
}

body.ui-compact .sidebar {
    display: none;
}

body.ui-compact .layout {
    grid-template-columns: minmax(0, 1fr);
}

body.ui-compact .main {
    max-width: 1160px;
    margin: 0 auto;
    padding: 26px 28px 48px;
}

body.ui-compact .page-head {
    align-items: center;
}

body.ui-compact .page-desc {
    display: none;
}

body.ui-compact .notice,
body.ui-compact [data-compact-only],
body.ui-compact .progress-group-title,
body.ui-compact .foot {
    display: none !important;
}

/* 简洁模式下的入口卡片更紧凑 */
body.ui-compact .feature-card {
    padding: 16px 18px;
}

body.ui-compact .feature-card-desc {
    display: none;
}

body.ui-compact .feature-card-foot {
    margin-top: 2px;
}

body.ui-compact .trainer-panel .panel-head {
    display: none;
}

body.ui-compact .trainer-panel {
    padding: 10px 20px;
}

body.ui-compact .trainer-panel .trainer-marks {
    display: none;
}

body.ui-compact .column-card-desc {
    display: none;
}

body.ui-compact .column-card-stats {
    margin-bottom: 8px;
}

body.ui-compact .column-cards {
    margin-bottom: 0;
}

/* ------------------------------------------------------------------ *
 * 表格
 * ------------------------------------------------------------------ */

.table-wrap {
    overflow-x: auto;
    border-radius: 12px;
    border: 1px solid var(--line-soft);
}

table.data {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    min-width: 720px;
}

table.data thead th {
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--ink-3);
    background: var(--surface-2);
    padding: 11px 14px;
    border-bottom: 1px solid var(--line);
    white-space: nowrap;
}

table.data tbody td {
    padding: 11px 14px;
    border-bottom: 1px solid var(--line-soft);
    color: var(--ink-2);
    vertical-align: middle;
}

table.data tbody tr:hover { background: #fcfcfe; }
table.data tbody tr:last-child td { border-bottom: none; }
table.data td.num { font-variant-numeric: tabular-nums; color: var(--ink); font-weight: 600; }
table.data a { color: var(--ink); text-decoration: none; font-weight: 600; }
table.data a:hover { color: var(--blue); }

.score-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    font-size: 12.5px;
    border-radius: 999px;
    padding: 3px 10px;
}

.score-pill.ok { background: var(--ok-soft); color: var(--ok); }
.score-pill.mid { background: var(--warn-soft); color: var(--warn); }
.score-pill.bad { background: var(--bad-soft); color: var(--bad); }
.score-pill.none { background: var(--line-soft); color: var(--ink-3); font-weight: 600; }

.col-dot {
    display: inline-block;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    margin-right: 6px;
    vertical-align: 1px;
}

.col-dot.purple { background: linear-gradient(135deg, #8b6bff, #7048c8); }
.col-dot.blue { background: linear-gradient(135deg, #7c93ff, #4d6bfe); }

/* ------------------------------------------------------------------ *
 * 空态 / 提示
 * ------------------------------------------------------------------ */

.empty {
    text-align: center;
    padding: 46px 20px;
    color: var(--ink-3);
}

.empty .big { font-size: 32px; margin-bottom: 10px; opacity: .5; }
.empty h3 { margin: 0 0 8px; color: var(--ink-2); font-size: 15px; }
.empty p { margin: 0 auto 16px; max-width: 460px; font-size: 13px; line-height: 1.75; }

.notice {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    border-radius: 12px;
    padding: 12px 16px;
    font-size: 12.5px;
    line-height: 1.7;
    margin-bottom: 18px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--ink-2);
}

.notice.warn { background: var(--warn-soft); border-color: #f3e2bd; color: #8a6109; }
.notice.ok { background: var(--ok-soft); border-color: #c3e8da; color: #0b7a55; }
.notice b { color: inherit; }

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 14px;
}

.about-card {
    background: var(--surface-2);
    border: 1px solid var(--line-soft);
    border-radius: var(--radius);
    padding: 18px 20px;
}

.about-card h3 {
    margin: 0 0 10px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.about-card ul { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: 13px; line-height: 1.9; }
.about-card p { margin: 0 0 10px; color: var(--ink-2); font-size: 13px; line-height: 1.8; }
.about-card .kbd {
    font-size: 12px;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-bottom-width: 2px;
    border-radius: 6px;
    padding: 1px 6px;
    color: var(--ink-2);
}

.author-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--blue-soft);
    border: 1px solid var(--blue-line);
    border-radius: 999px;
    padding: 6px 14px 6px 8px;
    font-size: 13px;
    color: var(--blue-dark);
    font-weight: 600;
}

.author-badge .avatar {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
}

.foot {
    margin-top: 34px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    font-size: 12px;
    color: var(--ink-3);
}

.foot .spacer { margin-left: auto; }

/* ------------------------------------------------------------------ *
 * 移动端
 * ------------------------------------------------------------------ */

@media (max-width: 900px) {
    .layout { grid-template-columns: 1fr; }
    .sidebar {
        position: static;
        height: auto;
        flex-direction: column;
        gap: 12px;
        border-right: none;
        border-bottom: 1px solid var(--line);
        padding: 16px;
    }
    .nav { flex-direction: row; overflow-x: auto; }
    .nav-sep { display: none; }
    .sidebar-foot { display: none; }
    .main { padding: 18px 16px 60px; }
    .test-row { grid-template-columns: 1fr; }
    .test-label { padding-top: 0; }
}