/* ================================================================
   Tufte-style theme for 量化交易研究
   Based on Tufte CSS, matching zhyantao.github.io (tufte-jekyll theme)
   纸面米色 #fffff8 · 墨色正文 #111 · 深红强调 #a00000 · ET Book 衬线
   ================================================================ */

/* ---------- ET Book 字体（与参考站同源） ---------- */
@font-face {
    font-family: "ET Book";
    src: url("fonts/et-book/et-book-roman-line-figures.woff") format("woff");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: "ET Book";
    src: url("fonts/et-book/et-book-display-italic-old-style-figures.woff") format("woff");
    font-weight: normal;
    font-style: italic;
    font-display: swap;
}
@font-face {
    font-family: "ET Book";
    src: url("fonts/et-book/et-book-bold-line-figures.woff") format("woff");
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}

:root {
    --bg: #fffff8;
    --card-bg: #fffefb;
    --text: #111111;
    --text-secondary: #6b6b60;
    --border: #dddcd0;
    --rule: #333333;
    --accent: #a00000;
    --green: #2e7d32;
    --red: #b0342c;
    --yellow: #a67c00;
    --orange: #b45309;
    --radius: 2px;
    --shadow: none;
    --serif: "ET Book", "ETBembo", Palatino, "Palatino Linotype", "Book Antiqua",
        Georgia, "Songti SC", "STSong", "SimSun", serif;
    --sans: "Gill Sans", "Gill Sans MT", "Gotham Narrow", Lato, Calibri,
        "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --mono: Consolas, "Liberation Mono", Menlo, Courier, "PingFang SC", monospace;
}

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

body {
    font-family: var(--serif);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    min-height: 100vh;
}

/* ================================================================
   站点互跳导航（与 zhyantao.github.io 各站页眉一致）
   ================================================================ */

nav.site-nav {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

nav.site-nav .nav-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    padding: 1rem 24px 0.7rem;
}

nav.site-nav a {
    font-family: var(--sans);
    font-size: 13px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    text-decoration: none;
    display: inline-block;
    padding: 0 1.4rem 0 0;
    background: none;
    border-radius: 0;
}

nav.site-nav a:hover { color: var(--text); }

nav.site-nav a img.nav-badge {
    height: 2.1rem;
    width: auto;
    display: block;
    margin-right: 0.8rem;
    padding-right: 0;
}

nav.site-nav a.active::before { content: "<\00a0"; }
nav.site-nav a.active::after { content: "\00a0>"; }

/* ================================================================
   Nav（站内页面导航）
   ================================================================ */

nav.app-nav {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav.app-nav .nav-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    padding: 0 24px;
    height: 48px;
    gap: 4px;
}

nav .brand {
    font-family: var(--serif);
    font-size: 17px;
    font-weight: 400;
    color: var(--text);
    margin-right: 24px;
    white-space: nowrap;
    text-decoration: none;
    padding: 0;
    border-radius: 0;
    background: none;
}
nav .brand:hover {
    background: none;
    color: var(--accent);
}

/* hamburger: hide checkbox */
#nav-toggle { display: none; }

/* actions group: date-select + hamburger */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

/* hamburger button: hidden on desktop */
.nav-toggle-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 28px;
    height: 28px;
    cursor: pointer;
    padding: 2px;
}

.nav-toggle-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-secondary);
    transition: all 0.2s;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

nav a {
    font-family: var(--sans);
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 0;
    font-size: 13px;
    letter-spacing: 0.04em;
    transition: all 0.15s;
    white-space: nowrap;
}

nav a:hover { background: rgba(51, 51, 51, 0.05); color: var(--text); }
nav a.active { background: transparent; color: var(--accent); font-weight: 600; }
nav a.active::before { content: "<\00a0"; }
nav a.active::after { content: "\00a0>"; }

/* date selector in navbar */
.nav-date-select {
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 0;
    background: var(--card-bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 12px;
    cursor: pointer;
    max-width: 140px;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23a00000' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 26px;
}
.nav-date-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(160, 0, 0, 0.12);
}

/* ================================================================
   Layout
   ================================================================ */

.container { max-width: 1400px; margin: 0 auto; padding: 24px; }

/* ================================================================
   Cards：细线纸面，直角，无阴影
   ================================================================ */

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 20px;
}

.card-clickable {
    cursor: pointer;
    transition: border-color 0.15s;
}
.card-clickable:hover {
    border-color: var(--accent);
}

.card-header {
    font-family: var(--sans);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

/* ================================================================
   Tables：booktabs 三线表
   ================================================================ */

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    border-top: 2px solid var(--rule);
    border-bottom: 2px solid var(--rule);
}

th, td {
    padding: 9px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

th {
    background: var(--bg);
    font-family: var(--sans);
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.03em;
    color: var(--text);
    border-bottom: 1px solid var(--rule);
    position: sticky;
    top: 0;
}

th a {
    color: var(--text);
    text-decoration: none;
}

th a:hover { color: var(--accent); }

tr:last-child td { border-bottom: none; }
tr:hover { background: #f7f2e8; }

/* ================================================================
   Tags / Badges：深红纸面小签，直角
   ================================================================ */

.tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 2px;
    font-family: var(--sans);
    font-size: 12px;
    font-weight: 600;
    border: 1px solid transparent;
}

.tag-buy    { background: #e7f0e8; color: var(--green); border-color: #c4d8c6; }
.tag-sell   { background: #f5e2e0; color: var(--red);   border-color: #e0c3bf; }
.tag-hold   { background: #f5edd7; color: var(--yellow); border-color: #e0d2a8; }
.tag-nosig  { background: #f0efe8; color: var(--text-secondary); border-color: var(--border); }
.tag-stock  { background: #e2e8ef; color: #2c577d; border-color: #c3cfdb; }
.tag-fund   { background: #e9e2ee; color: #5d3f78; border-color: #d0c2dc; }

/* ================================================================
   Buttons：细线直角，悬停变深红
   ================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 0;
    font-family: var(--sans);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.04em;
    border: 1px solid var(--rule);
    background: transparent;
    color: var(--text);
    cursor: pointer;
    transition: all 0.15s;
    text-decoration: none;
}

.btn:hover { color: var(--accent); border-color: var(--accent); }

.btn-primary { background: var(--accent); border-color: var(--accent); color: #fffff8; }
.btn-primary:hover { background: #7c0000; border-color: #7c0000; color: #fffff8; }
.btn-success { background: var(--green); border-color: var(--green); color: #fff; }
.btn-success:hover { background: #256428; border-color: #256428; color: #fff; }
.btn-danger  { background: var(--red); border-color: var(--red); color: #fff; }
.btn-danger:hover { background: #8c2a23; border-color: #8c2a23; color: #fff; }
.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}
.btn-outline:hover { background: rgba(160, 0, 0, 0.06); color: var(--accent); border-color: var(--accent); }
.btn-sm { padding: 5px 12px; font-size: 12px; }

.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ================================================================
   Tabs
   ================================================================ */

.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--rule);
    padding-bottom: 0;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-family: var(--sans);
    font-size: 13px;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all 0.15s;
}

.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ================================================================
   Pipeline
   ================================================================ */

.pipeline-steps { display: flex; flex-direction: column; gap: 8px; }
.pipeline-step {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}
.pipeline-step .step-num {
    width: 32px; height: 32px;
    border-radius: 2px;
    background: var(--accent);
    color: #fffff8;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--sans);
    font-weight: 700; font-size: 14px;
    flex-shrink: 0;
    transition: background 0.3s;
}

.pipeline-step.step-done { background: #f0f5f0; border-color: #c4d8c6; }
.pipeline-step.step-done .step-num,
.step-num-done { background: var(--green); }

.pipeline-step.step-running { background: #f7ecec; border-color: #e0c3bf; }
.pipeline-step.step-running .step-num,
.step-num-running { background: var(--accent); animation: pulse 0.8s ease-in-out infinite; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}
.pipeline-step .step-info { flex: 1; min-width: 0; }
.pipeline-step .step-name { font-family: var(--sans); font-weight: 600; font-size: 13px; }
.pipeline-step .step-desc { font-family: var(--sans); font-size: 12px; color: var(--text-secondary); }
.pipeline-step .step-actions { flex-shrink: 0; }

.log-box {
    background: #161616;
    color: #d4d4d4;
    border-radius: var(--radius);
    padding: 16px;
    font-family: var(--mono);
    font-size: 12px;
    max-height: 400px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

/* ================================================================
   Backtest
   ================================================================ */

.backtest-chart { max-width: 100%; border: 1px solid var(--border); }

.md-content {
    font-size: 14px;
    line-height: 1.8;
    min-width: 0;
    overflow-wrap: break-word;
    position: relative;
}

.md-content h1 { font-size: 22px; margin-bottom: 12px; font-weight: 400; }
.md-content h2 { margin-top: 20px; margin-bottom: 8px; font-size: 18px; font-weight: 400; font-style: italic; }
.md-content h3 { margin-top: 14px; font-size: 15px; font-weight: 400; font-style: italic; }
.md-content .md-list { padding: 0; margin: 8px 0; list-style-position: inside; }
.md-content .md-list li { padding: 2px 0; overflow-wrap: break-word; }
.md-content table { margin: 12px 0; }
.md-content .table-wrap { margin: 12px 0; }
.md-content p { overflow-wrap: break-word; margin: 4px 0; }

.md-content.summary-collapsed {
    max-height: 280px !important;
    overflow: hidden;
    cursor: pointer;
}

.md-content.summary-collapsed::after {
    content: '展开阅读 ▼';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 70px;
    padding-top: 48px;
    text-align: center;
    font-family: var(--sans);
    font-size: 13px;
    color: var(--accent);
    background: linear-gradient(transparent 0%, var(--card-bg) 55%);
    pointer-events: none;
}

/* 回测记录项 hover */
.backtest-record {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    text-decoration: none;
    color: var(--text);
    border-radius: 0;
    margin-bottom: 4px;
}
.backtest-record:hover { background: #f7f2e8; }
.backtest-record.active { background: rgba(160, 0, 0, 0.08); font-weight: 600; }

.backtest-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 20px;
}

/* ================================================================
   Dashboard layout
   ================================================================ */

.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* ================================================================
   Holdings donut
   ================================================================ */

.holdings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.donut-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    padding: 10px;
}

.donut-legend { font-family: var(--sans); font-size: 13px; }
.donut-legend div { margin: 6px 0; }
.donut-dot {
    display: inline-block;
    width: 12px; height: 12px;
    border-radius: 2px;
    margin-right: 6px;
    vertical-align: middle;
}

/* ================================================================
   Empty state
   ================================================================ */

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.empty-state .empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty-state .empty-text { font-size: 16px; margin-bottom: 8px; font-style: italic; }
.empty-state .empty-hint { font-family: var(--sans); font-size: 13px; margin-bottom: 16px; }

/* ================================================================
   Responsive — tablets (≤1024px)
   ================================================================ */

@media (max-width: 1024px) {
    .backtest-layout {
        grid-template-columns: minmax(0, 1fr);
    }
    .backtest-layout > * {
        min-width: 0;
    }

    .container {
        padding: 16px;
    }

    .card {
        padding: 16px;
    }

    .card-header {
        font-size: 13px;
        margin-bottom: 12px;
        padding-bottom: 10px;
    }
}

/* ================================================================
   Responsive — phones (≤768px)
   ================================================================ */

@media (max-width: 768px) {
    /* 站点导航 */
    nav.site-nav .nav-inner {
        padding: 0.7rem 16px 0.5rem;
    }

    /* Nav → hamburger menu */
    nav.app-nav .nav-inner {
        padding: 0 16px;
        height: 48px;
        flex-wrap: wrap;
    }

    nav .brand {
        font-size: 15px;
        margin-right: auto;
    }

    .nav-toggle-btn {
        display: flex;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        order: 10;
        padding: 0 0 12px 0;
        gap: 2px;
        background: var(--bg);
    }

    #nav-toggle:checked ~ .nav-links {
        display: flex;
    }

    .nav-links a {
        width: 100%;
        padding: 10px 14px;
        font-size: 13px;
    }

    .nav-actions {
        gap: 6px;
        flex-wrap: nowrap;
    }

    .nav-date-select {
        max-width: none;
        margin: 4px 0;
        float: left;
        display: flex;
    }

    /* Layout */
    .container {
        padding: 12px;
    }

    /* Cards */
    .card {
        padding: 14px;
        margin-bottom: 14px;
    }

    /* Two-column layouts → stack */
    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .holdings-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .backtest-layout {
        grid-template-columns: minmax(0, 1fr);
        gap: 14px;
    }
    .backtest-layout > * {
        min-width: 0;
    }

    /* Donut chart */
    .donut-wrap {
        flex-direction: column;
        gap: 16px;
    }

    /* Tables */
    th, td {
        padding: 8px 10px;
        font-size: 12px;
    }

    /* Pipeline steps */
    .pipeline-step {
        flex-wrap: wrap;
        padding: 10px 14px;
        gap: 8px;
    }

    .pipeline-step .step-num {
        width: 28px;
        height: 28px;
        font-size: 13px;
    }

    .pipeline-step .step-name {
        font-size: 12px;
    }

    .pipeline-step .step-desc {
        font-size: 11px;
    }

    /* Tabs */
    .tab-btn {
        padding: 8px 14px;
        font-size: 12px;
    }

    /* Buttons */
    .btn {
        padding: 8px 16px;
        font-size: 12px;
    }

    .btn-sm {
        padding: 6px 12px;
        font-size: 12px;
    }

    /* Empty state */
    .empty-state {
        padding: 32px 16px;
    }

    .empty-state .empty-icon { font-size: 36px; }
    .empty-state .empty-text { font-size: 14px; }

    /* Backtest */
    .md-content { font-size: 13px; }
    .md-content h1 { font-size: 20px; }
    .md-content h2 { font-size: 16px; }
    .md-content h3 { font-size: 14px; }
    .md-content .table-wrap { margin: 8px -14px; width: calc(100% + 28px); }

    /* Pipeline log */
    .log-box {
        padding: 12px;
        font-size: 11px;
        max-height: 250px;
    }
}

/* ================================================================
   Responsive — small phones (≤480px)
   ================================================================ */

@media (max-width: 480px) {
    nav.app-nav .nav-inner {
        height: 44px;
        padding: 0 12px;
    }

    nav .brand {
        font-size: 14px;
    }

    .container {
        padding: 10px;
    }

    .card {
        padding: 12px;
        margin-bottom: 12px;
    }

    .card-header {
        font-size: 12px;
        margin-bottom: 10px;
        padding-bottom: 8px;
    }

    th, td {
        padding: 6px 8px;
        font-size: 11px;
    }

    .btn {
        padding: 7px 14px;
        font-size: 12px;
    }

    .tag {
        font-size: 11px;
        padding: 2px 8px;
    }
}

/* ================================================================
   Footer（参考站 footer 风格）
   ================================================================ */

footer.site-footer {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 24px 2.5rem;
    font-family: var(--sans);
}

footer.site-footer hr.slender {
    border: 0;
    height: 1px;
    margin: 1.4rem 0;
    background-image: linear-gradient(to right, rgba(0,0,0,0), rgba(0,0,0,0.45), rgba(0,0,0,0));
}

footer.site-footer .credits {
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
    letter-spacing: 0.04em;
}

footer.site-footer .credits a { color: var(--accent); text-decoration: none; }

/* 纯静态前端：加载态 */
.loading {
  padding: 40px 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
  letter-spacing: 0.08em;
}

/* 证券代码外链（天天基金 / 雪球） */
a.code-link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dotted currentColor;
  font-family: var(--mono, inherit);
}
a.code-link:hover { color: #7c0000; }

/* 数据更新按钮与 CI 状态 */
nav.app-nav .ci-btn {
    padding: 5px 12px;
    font-size: 12px;
    white-space: nowrap;
}
.ci-status {
    font-size: 11px;
    color: var(--text-secondary);
    white-space: nowrap;
}
.ci-status.ok { color: var(--green); }
.ci-status.fail { color: var(--red); }
.ci-status.running { color: var(--gold, #b7950b); }
@media (max-width: 720px) {
    .ci-status { display: none; }
}

/* 回测页：汇总在上、逐笔明细在下 */
.backtest-chart { display: block; }
.md-notes {
    margin-top: 18px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-secondary);
}
.md-notes summary { cursor: pointer; margin-bottom: 6px; }
.md-notes h2 { font-size: 14px; margin-top: 12px; }
table.trade-table td { white-space: nowrap; }

/* ------------------------------------------------------------------
   回测交互式图表（纯 SVG，悬浮显示日期与数值）
   ------------------------------------------------------------------ */
.bt-chart { font-family: var(--sans); }
.bt-toolbar {
    display: flex; flex-wrap: wrap; gap: 10px;
    align-items: center; justify-content: space-between;
    margin-bottom: 10px;
}
.bt-legend { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; font-size: 12px; color: var(--text-secondary); }
.bt-legend > span { display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; }
.bt-swatch { display: inline-block; width: 11px; height: 11px; border-radius: 2px; flex: none; }
.bt-swatch.dashed { height: 0; border-top: 2px dashed #e08a26; background: none !important; border-radius: 0; }
.bt-hint-text { font-size: 11px; font-style: italic; }
.bt-ranges { display: inline-flex; gap: 4px; flex-wrap: wrap; }
.bt-range-btn {
    padding: 4px 10px; font-size: 12px; line-height: 1.4;
    font-family: var(--sans); color: var(--text-secondary);
    background: transparent; border: 1px solid var(--border);
    border-radius: 2px; cursor: pointer;
}
.bt-range-btn:hover { color: var(--text); border-color: var(--text-secondary); }
.bt-range-btn.active { color: #fff; background: var(--text-secondary); border-color: var(--text-secondary); }

.bt-stats {
    display: flex; flex-wrap: wrap; gap: 8px 20px;
    font-size: 12px; color: var(--text-secondary);
    padding: 0 0 10px; border-bottom: 1px solid var(--border);
}
.bt-stats b { color: var(--text); font-family: var(--mono); font-weight: 600; }

.bt-plot { position: relative; overflow-x: auto; overflow-y: hidden; }
.bt-svg { display: block; width: 100%; min-width: 720px; height: auto; }
.bt-svg text { font-family: var(--sans); font-size: 13px; fill: var(--text-secondary); }
.bt-svg .bt-bar-label { font-size: 13px; fill: var(--text); font-family: var(--mono); }
.bt-grid { stroke: var(--border); stroke-width: 1; vector-effect: non-scaling-stroke; }
.bt-base { stroke: var(--text-secondary); stroke-width: 1; stroke-dasharray: 5 5; opacity: 0.55; vector-effect: non-scaling-stroke; }
.bt-tick { stroke: var(--border); stroke-width: 1; vector-effect: non-scaling-stroke; }
.bt-line { fill: none; stroke-width: 2; vector-effect: non-scaling-stroke; stroke-linejoin: round; }
.bt-line-bm { stroke-width: 1.6; stroke-dasharray: 7 4; }
.bt-line-dd { stroke-width: 1.4; }
.bt-dd-area { opacity: 0.18; stroke: none; }
.bt-cross {
    stroke: var(--text-secondary); stroke-width: 1; stroke-dasharray: 4 4;
    opacity: 0; pointer-events: none; vector-effect: non-scaling-stroke;
}
.bt-dot { opacity: 0; pointer-events: none; stroke: var(--card-bg); stroke-width: 2; }
.bt-cross-label-bg { fill: var(--text-secondary); opacity: 0; pointer-events: none; }
.bt-svg text.bt-cross-label {
    fill: #fff; font-family: var(--mono); font-size: 12px;
    opacity: 0; pointer-events: none;
}
.bt-hit { cursor: crosshair; }
.bt-bar { cursor: pointer; }

.bt-tooltip {
    position: absolute; z-index: 5; top: 0; left: 0;
    min-width: 250px; max-width: 360px;
    padding: 9px 11px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
    border-radius: 2px;
    font-family: var(--sans); font-size: 12px; color: var(--text);
    pointer-events: none; white-space: nowrap;
}
.bt-tt-date {
    font-size: 13px; font-weight: 700; padding-bottom: 6px;
    margin-bottom: 6px; border-bottom: 1px solid var(--border);
}
.bt-tt-date span { font-weight: 400; font-size: 11px; color: var(--text-secondary); margin-left: 5px; }
.bt-tt-table { width: 100%; border-collapse: collapse; }
.bt-tt-table td { padding: 2px 0; }
.bt-tt-label { color: var(--text-secondary); }
.bt-tt-label .bt-swatch { width: 8px; height: 8px; margin-right: 5px; }
.bt-tt-val { text-align: right; font-family: var(--mono); font-weight: 600; padding-left: 12px; }
.bt-tt-extra { text-align: right; font-family: var(--mono); color: var(--text-secondary); padding-left: 10px; min-width: 58px; }
.bt-tt-foot {
    margin-top: 7px; padding-top: 6px; border-top: 1px solid var(--border);
    line-height: 1.7; color: var(--text-secondary); font-size: 11px;
}
.bt-tt-foot b { color: var(--text); font-family: var(--mono); }

.bt-yearly { margin-top: 20px; padding-top: 12px; border-top: 1px solid var(--border); }
.bt-yearly-title { font-size: 12px; color: var(--text-secondary); margin-bottom: 6px; }
.bt-plot-yearly .bt-svg { min-width: 720px; }
.bt-foot { margin-top: 10px; font-size: 11px; color: var(--text-secondary); }
.bt-foot a { color: var(--accent); text-decoration: none; border-bottom: 1px dotted currentColor; }
.bt-foot a:hover { color: #7c0000; }
.bt-empty { padding: 24px; text-align: center; font-size: 13px; color: var(--text-secondary); }
.bt-fallback { margin-top: 10px; font-size: 12px; color: var(--text-secondary); }
.bt-fallback summary { cursor: pointer; }
.bt-fallback img { display: block; max-width: 100%; margin-top: 10px; border: 1px solid var(--border); }

@media (max-width: 720px) {
    .bt-hint-text { display: none; }
    .bt-stats { gap: 6px 12px; }
}