/* ============================================================
   俄里巴巴数据监控大屏 - 深蓝科技风
   ============================================================ */
:root {
    --db-bg: #0B1F3A;
    --db-bg-2: #0E2444;
    --db-card: #10294D;
    --db-border: #2A4A7A;
    --db-text: #DCEBFA;
    --db-text-dim: #8FA9C9;
    --db-blue: #3E9BE9;
    --db-cyan: #43D2F1;
    --db-green: #30C0B4;
    --db-orange: #F2994A;
}

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

/* 大屏容器：既可作为独立页面 body.db，也可作为首页 section.db 区块 */
.db {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    background:
        radial-gradient(1200px 500px at 50% -10%, rgba(62,155,233,.18), transparent 60%),
        linear-gradient(160deg, var(--db-bg) 0%, var(--db-bg-2) 100%);
    color: var(--db-text);
    overflow: hidden;
}

.db-screen {
    max-width: 1440px;
    margin: 0 auto;
    padding: 26px 32px 40px;
    display: flex;
    flex-direction: column;
    gap: 22px;
}

/* 首页内嵌区块模式 */
section.db {
    padding: 52px 0 60px;
}
/* 独立大屏页铺满视口 */
body.db {
    min-height: 100vh;
}

/* ===== 顶部标题栏 ===== */
.db-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid rgba(62,155,233,.25);
}

.db-header__title {
    font-size: 30px;
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(90deg, #EAF6FF, #7FD1F7);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.db-header__sub {
    margin-top: 6px;
    font-size: 13px;
    color: var(--db-text-dim);
    letter-spacing: 1px;
}

.db-header__right {
    display: flex;
    align-items: center;
    gap: 14px;
}

.db-clock {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    border: 1px solid var(--db-border);
    border-radius: 999px;
    font-size: 14px;
    color: var(--db-cyan);
    background: rgba(62,155,233,.08);
}
.db-clock em { font-style: normal; font-variant-numeric: tabular-nums; }

.db-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 999px;
    background: #A9DCF7;
    color: #0B1F3A;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: transform .2s, box-shadow .2s;
}
.db-back-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(127,209,247,.35);
}

/* ===== KPI 指标卡 ===== */
.db-kpis {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}

.db-kpi {
    display: flex;
    align-items: center;
    gap: 16px;
    background: linear-gradient(150deg, rgba(62,155,233,.10), rgba(62,155,233,.03));
    border: 1px solid var(--db-border);
    border-radius: 18px;
    padding: 20px 22px;
    transition: transform .25s, border-color .25s;
}
.db-kpi:hover {
    transform: translateY(-4px);
    border-color: var(--db-cyan);
}

.db-kpi__icon {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    font-size: 24px;
    color: #08213D;
    box-shadow: 0 4px 14px rgba(0,0,0,.25);
}

.db-kpi__label {
    display: block;
    font-size: 13px;
    color: var(--db-text-dim);
    margin-bottom: 6px;
}

.db-kpi__value {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: #EAF6FF;
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
}

.db-kpi__trend {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 7px;
    font-size: 12px;
}
.db-kpi__trend.up   { color: #3DDC97; }
.db-kpi__trend.down { color: #FF8A7A; }

/* ===== 图表面板 ===== */
.db-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 22px;
}

.db-panel {
    background: linear-gradient(150deg, rgba(62,155,233,.08), rgba(16,41,77,.6));
    border: 1px solid var(--db-border);
    border-radius: 20px;
    padding: 18px 20px 14px;
    display: flex;
    flex-direction: column;
    min-height: 380px;
}

.db-panel__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(62,155,233,.18);
}

.db-panel__head h3 {
    font-size: 16px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 9px;
    color: #EAF6FF;
}
.db-panel__head h3 i { color: var(--db-cyan); }

.db-panel__tag,
.db-panel__live {
    font-size: 12px;
    color: var(--db-text-dim);
}
.db-panel__live {
    color: #FF8A7A;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    animation: blink 1.4s infinite;
}
@keyframes blink { 50% { opacity: .35; } }

.db-chart {
    flex: 1;
    min-height: 300px;
}

/* ===== 热销榜单 ===== */
.db-rank {
    list-style: none;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    padding: 10px 4px 2px;
}

.db-rank li { display: flex; flex-direction: column; gap: 7px; }

.db-rank__row {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
}

.db-rank__no {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 7px;
    display: grid;
    place-items: center;
    font-size: 12px;
    font-weight: 700;
    color: #08213D;
    background: #37507A;
}
.db-rank li:nth-child(1) .db-rank__no { background: linear-gradient(135deg,#FFD166,#F2994A); }
.db-rank li:nth-child(2) .db-rank__no { background: linear-gradient(135deg,#B9D9F5,#7FB6E8); }
.db-rank li:nth-child(3) .db-rank__no { background: linear-gradient(135deg,#8FE0C8,#30C0B4); }

.db-rank__name { flex: 1; color: var(--db-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.db-rank__sales { color: var(--db-cyan); font-variant-numeric: tabular-nums; }

.db-rank__bar {
    height: 6px;
    border-radius: 4px;
    background: rgba(62,155,233,.14);
    overflow: hidden;
}
.db-rank__bar i {
    display: block;
    height: 100%;
    border-radius: 4px;
    background: linear-gradient(90deg, #3E9BE9, #43D2F1);
    transition: width .8s ease;
}

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
    .db-grid { grid-template-columns: 1fr; }
    .db-kpis { grid-template-columns: repeat(2, 1fr); }
    .db-header__title { font-size: 24px; }
}
@media (max-width: 640px) {
    .db-screen { padding: 18px 14px 30px; }
    .db-kpis { grid-template-columns: 1fr; }
    .db-header { flex-direction: column; align-items: flex-start; }
}