:root {
    --nav: #202832;
    --nav-soft: #2d3844;
    --blue: #2d72e8;
    --red: #df4b4b;
    --gold: #d59a43;
    --green: #39a875;
    --text: #1f2933;
    --muted: #768191;
    --line: #e5e9ef;
    --bg: #f4f6f9;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "Microsoft JhengHei", sans-serif;
    color: var(--text);
    background: var(--bg);
}
a { color: inherit; text-decoration: none; }
.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: 252px;
    padding: 24px 16px;
    color: #fff;
    background: linear-gradient(180deg, var(--nav), #172029);
}
.admin-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; }
.admin-brand.centered { justify-content: center; color: var(--text); }
.admin-brand strong { display: block; }
.admin-brand small { display: block; color: #aeb8c5; font-size: 12px; }
.brand-mark {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border: 2px solid var(--gold);
    border-radius: 50%;
    color: var(--gold);
    font-weight: 800;
}
.sidebar nav { display: grid; gap: 8px; }
.sidebar nav a {
    padding: 12px 14px;
    border-radius: 6px;
    color: #dbe3ec;
}
.sidebar nav a:hover, .sidebar nav a:first-child { background: var(--blue); color: #fff; }
.admin-main { margin-left: 252px; padding: 24px; }
.admin-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}
.admin-topbar h1 { margin: 0; font-size: 28px; }
.metric-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}
.metric-grid article, .panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 12px 28px rgba(20,31,45,.06);
}
.metric-grid article { padding: 24px; }
.metric-grid span { display: block; color: var(--muted); }
.metric-grid strong { display: block; margin: 10px 0; font-size: 30px; }
.metric-grid small { color: var(--green); }
.admin-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 24px; }
.panel { padding: 22px; overflow-x: auto; }
.panel h2 { margin: 0 0 18px; font-size: 20px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.panel-head h2 { margin: 0; }
table { width: 100%; border-collapse: collapse; min-width: 760px; }
th, td { padding: 14px 12px; border-bottom: 1px solid var(--line); text-align: left; font-size: 14px; }
th { color: var(--muted); font-weight: 700; background: #fafbfc; }
td a { color: var(--blue); font-weight: 700; }
.status {
    display: inline-flex;
    padding: 4px 10px;
    border-radius: 99px;
    font-size: 12px;
    background: #edf1f5;
}
.status.pending { color: #a66b00; background: #fff3d6; }
.status.processing { color: #946018; background: #ffe8c7; }
.status.completed { color: #147247; background: #dff6e9; }
.status.cancelled { color: #b73535; background: #ffe2e2; }
.small-btn, .status-form button {
    display: inline-flex;
    min-height: 34px;
    align-items: center;
    padding: 0 12px;
    color: #fff;
    border: 0;
    border-radius: 6px;
    background: var(--blue);
    font-weight: 700;
    cursor: pointer;
}
.chart-bars {
    display: flex;
    align-items: end;
    gap: 18px;
    height: 220px;
    padding: 20px;
    border-left: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
.chart-bars span {
    flex: 1;
    min-width: 30px;
    border-radius: 6px 6px 0 0;
    background: linear-gradient(180deg, var(--red), var(--gold));
}
.donut {
    width: 220px;
    height: 220px;
    margin: 10px auto;
    border-radius: 50%;
    background: conic-gradient(var(--blue) 0 35%, var(--gold) 35% 60%, var(--green) 60% 85%, #f49aaa 85% 100%);
}
.detail-list {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 14px;
}
.detail-list dt { color: var(--muted); }
.detail-list dd { margin: 0; }
.status-form { display: flex; align-items: end; gap: 12px; margin-top: 24px; }
.status-form label { display: grid; gap: 8px; }
input, select {
    padding: 11px 12px;
    border: 1px solid var(--line);
    border-radius: 6px;
    font: inherit;
}
.flash {
    margin-bottom: 18px;
    padding: 12px 16px;
    border-radius: 8px;
    background: #eaf8ef;
    border: 1px solid #9ed5ae;
}
.flash.error { background: #fff0ee; border-color: #e6a098; }
.auth-page {
    display: grid;
    min-height: 100vh;
    place-items: center;
    background: radial-gradient(circle at top, #fff4df, #eef2f6 62%);
}
.auth-card {
    width: min(420px, calc(100vw - 32px));
    padding: 34px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 24px 50px rgba(20,31,45,.14);
}
.auth-card form { display: grid; gap: 16px; }
.auth-card label { display: grid; gap: 8px; font-weight: 700; }
.auth-card button {
    min-height: 44px;
    color: #fff;
    border: 0;
    border-radius: 6px;
    background: var(--blue);
    font-weight: 800;
    cursor: pointer;
}

@media (max-width: 980px) {
    .sidebar { position: static; width: auto; }
    .admin-main { margin-left: 0; }
    .metric-grid, .admin-grid { grid-template-columns: 1fr; }
}