/**
 * chart-demo.css — uPlot 走势示例页（demo/chart-uplot.php）
 * 沿用站内沥青蓝 + 价牌色；油品色与 common.css 的 --grade-* 一致
 */

.chart-demo {
    padding: 0.5rem 0 2rem;
}

.chart-demo__head {
    margin-bottom: 1.25rem;
}

.chart-demo__eyebrow {
    margin: 0 0 0.35rem;
    font-family: var(--font-data);
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    color: var(--muted);
}

.chart-demo__title {
    margin: 0 0 0.5rem;
    font-family: var(--font-display);
    font-size: clamp(1.45rem, 4vw, 1.85rem);
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.02em;
}

.chart-demo__lead {
    margin: 0;
    max-width: 36rem;
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.55;
}

.chart-demo__panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 0.85rem 0.75rem 1rem;
    box-shadow: 0 1px 0 rgba(20, 28, 38, 0.04);
}

.chart-demo__panel-top {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.35rem 1rem;
    margin-bottom: 0.75rem;
    padding: 0 0.25rem;
}

.chart-demo__panel-title {
    margin: 0;
    font-family: var(--font-display);
    font-size: 1.05rem;
}

.chart-demo__meta {
    margin: 0;
    font-family: var(--font-data);
    font-size: 0.78rem;
    color: var(--muted);
}

/* 图例：居右，多行可点，触控友好 */
.chart-demo__legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.4rem;
    margin-bottom: 0.75rem;
    padding: 0 0.15rem;
}

.chart-demo__chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    min-height: 40px;
    padding: 0.35rem 0.7rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #f7f9fc;
    color: var(--ink);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.chart-demo__chip.is-on {
    border-color: transparent;
    color: #fff;
}

.chart-demo__chip.is-on[data-key="oil92"] { background: var(--grade-92); }
.chart-demo__chip.is-on[data-key="oil95"] { background: var(--grade-95); }
.chart-demo__chip.is-on[data-key="oil98"] { background: var(--grade-98); }
.chart-demo__chip.is-on[data-key="diesel0"] { background: var(--grade-diesel); }
.chart-demo__chip.is-on[data-key="diesel10"] { background: #8b6a4a; }

.chart-demo__chip-dot {
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: currentColor;
    opacity: 0.85;
    flex-shrink: 0;
}

/* 未选中：灰色圆点 */
.chart-demo__chip:not(.is-on) .chart-demo__chip-dot {
    background: var(--muted);
    opacity: 0.45;
}

/* 选中：白点，避免与色底融在一起 */
.chart-demo__chip.is-on .chart-demo__chip-dot {
    background: #fff;
    opacity: 1;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.12);
}

.chart-demo__stage {
    position: relative;
    width: 100%;
    min-height: 260px;
}

.chart-demo__stage--uplot {
    min-height: 280px;
}

.chart-demo__tip {
    position: absolute;
    z-index: 2;
    left: 0.5rem;
    top: 0.5rem;
    max-width: calc(100% - 1rem);
    padding: 0.55rem 0.7rem;
    border-radius: var(--radius);
    background: rgba(14, 20, 25, 0.92);
    color: #f2f5f8;
    font-size: 0.8rem;
    line-height: 1.45;
    pointer-events: none;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);
}

.chart-demo__tip strong {
    color: var(--led-gold);
    font-family: var(--font-data);
}

.chart-demo__foot {
    margin: 1rem 0 0;
    font-size: 0.85rem;
    color: var(--muted);
}

.chart-demo__foot a {
    color: var(--asphalt-mid);
}

/* uPlot 主题微调，贴合本站 */
.chart-demo .uplot {
    font-family: var(--font-data);
}

.chart-demo .u-legend {
    display: none; /* 用自定义 chip 图例 */
}

@media (min-width: 768px) {
    .chart-demo__panel {
        padding: 1.1rem 1.15rem 1.25rem;
    }

    .chart-demo__stage {
        min-height: 320px;
    }
}