:root {
  color-scheme: light dark;
  --ink: #17201d;
  --muted: #6f7b76;
  --paper: #f3f1e9;
  --surface: #fffef8;
  --line: #d8d8cf;
  --accent: #e85d3f;
  --green: #25745b;
  --amber: #b67b25;
  --blue: #3f6d8f;
  --radius: 1.25rem;
  font-family: Inter, "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); }
button, select { font: inherit; }
button { color: inherit; }
.skip-link { position: fixed; inset: .5rem auto auto .5rem; z-index: 20; padding: .7rem 1rem; background: var(--ink); color: white; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

.topbar { max-width: 1440px; margin: auto; padding: 1.1rem clamp(1rem, 4vw, 4rem); display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: .75rem; color: inherit; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 2.35rem; aspect-ratio: 1; border: 1px solid currentColor; border-radius: 50%; font-family: Georgia, serif; font-style: italic; }
.brand strong, .brand small { display: block; }
.brand small { margin-top: .18rem; color: var(--muted); font-size: .56rem; letter-spacing: .18em; }
.status { display: flex; align-items: center; gap: .6rem; color: var(--muted); font-size: .78rem; }
.status time { padding-inline-start: .6rem; border-inline-start: 1px solid var(--line); font-variant-numeric: tabular-nums; }
.status-dot { width: .5rem; aspect-ratio: 1; border-radius: 50%; background: var(--amber); box-shadow: 0 0 0 4px color-mix(in srgb, var(--amber) 17%, transparent); }

main { max-width: 1440px; margin: auto; padding: 0 clamp(1rem, 4vw, 4rem) 4rem; }
.hero { min-height: 23rem; padding-block: clamp(3rem, 8vw, 7rem) 3rem; display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(16rem, .6fr); gap: 2rem; align-items: end; }
.eyebrow { margin: 0 0 .65rem; color: var(--accent); font-size: .68rem; font-weight: 800; letter-spacing: .18em; }
h1 { max-width: 12ch; margin: 0; font-family: Georgia, "Noto Serif TC", serif; font-size: clamp(3.4rem, 8vw, 7.8rem); font-weight: 500; letter-spacing: -.055em; line-height: .87; }
h1 em { color: var(--accent); font-weight: 500; }
.hero-copy { max-width: 38rem; margin: 1.5rem 0 0; color: var(--muted); font-size: clamp(1rem, 1.5vw, 1.2rem); line-height: 1.7; }
.market-pulse { padding: 1.4rem; border: 1px solid var(--line); border-radius: var(--radius); background: color-mix(in srgb, var(--surface) 65%, transparent); }
.market-pulse > span { color: var(--muted); font-size: .75rem; }
.market-pulse > strong { display: block; margin-block: .7rem .25rem; font: 500 clamp(3rem, 6vw, 5rem)/1 Georgia, serif; }
.market-pulse > strong small { color: var(--muted); font: 600 .78rem/1 sans-serif; }
.market-pulse p { margin: .7rem 0 0; line-height: 1.6; }

.metal-nav { display: flex; gap: .55rem; padding-block: 1rem 1.5rem; overflow-x: auto; border-top: 1px solid var(--line); }
.metal-chip { flex: none; min-height: 2.7rem; padding: .65rem 1rem; border: 1px solid var(--line); border-radius: 999px; background: transparent; cursor: pointer; }
.metal-chip span { margin-inline-start: .35rem; color: var(--muted); font-size: .72rem; }
.metal-chip.is-active { border-color: var(--ink); background: var(--ink); color: var(--surface); }
.metal-chip.is-active span { color: color-mix(in srgb, var(--surface) 70%, transparent); }

.kpi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-bottom: 1rem; }
.kpi-card { position: relative; min-height: 11.5rem; padding: 1.25rem; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.kpi-card[hidden] { display: none; }
.kpi-head { display: flex; align-items: center; gap: .55rem; }
.kpi-head > span, .metal-code { display: inline-grid; place-items: center; min-width: 2.2rem; min-height: 2.2rem; padding: .25rem; border-radius: .55rem; color: white; font-size: .68rem; font-weight: 850; letter-spacing: .08em; }
.copper .kpi-head > span, .metal-code.copper { background: #b65c38; }
.aluminum .kpi-head > span, .metal-code.aluminum { background: #667c86; }
.tin .kpi-head > span, .metal-code.tin { background: #52674f; }
.metal-code.steel { background: #5f6266; }.metal-code.stainless { background: #726a82; }
.kpi-head > small { color: var(--muted); }
.kpi-head > b { margin-inline-start: auto; font-size: .76rem; }
.kpi-card > strong { display: inline-block; margin-top: 1.5rem; font: 500 clamp(2.1rem, 4vw, 3.3rem)/1 Georgia, serif; font-variant-numeric: tabular-nums; }
.kpi-card > small { margin-inline-start: .4rem; color: var(--muted); }
.spark { position: absolute; inset: auto 1.25rem 1rem 50%; height: 3rem; display: flex; align-items: end; gap: .28rem; opacity: .4; }
.spark i { flex: 1; height: var(--h); min-width: .3rem; background: currentColor; border-radius: .2rem .2rem 0 0; }
.rise { color: var(--accent); }

.dashboard-grid { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(18rem, .65fr); gap: 1rem; }
.panel { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.trend-panel, .strategy-panel, .price-panel { padding: clamp(1rem, 2.5vw, 1.65rem); }
.section-head { display: flex; align-items: start; justify-content: space-between; gap: 1rem; }
.section-head h2 { margin: 0; font: 500 clamp(1.5rem, 3vw, 2.25rem)/1.1 Georgia, serif; }
.section-head > p { margin: 0; color: var(--muted); font-size: .75rem; }
.range-tabs { display: flex; gap: .25rem; padding: .25rem; border-radius: 999px; background: var(--paper); }
.range-tabs button { position: relative; min-height: 2.25rem; padding: .45rem .8rem; border: 0; background: transparent; cursor: pointer; }
.range-tabs button[aria-selected="true"]::after { content: ""; position: absolute; inset: auto .7rem .2rem; border-bottom: 2px solid var(--accent); }
.chart-meta { display: grid; grid-template-columns: 1fr 1fr auto auto; align-items: end; gap: 1.25rem; margin-block: 2rem 1rem; }
.chart-meta span, .chart-meta label { display: block; color: var(--muted); font-size: .68rem; }
.chart-meta strong { display: block; margin-top: .25rem; font-size: 1.15rem; }
.chart-meta select { min-height: 2.45rem; padding: .45rem 2.2rem .45rem .7rem; border: 1px solid var(--line); border-radius: .55rem; background: var(--surface); }
.chart-figure { margin: 0; }
#price-chart { width: 100%; height: auto; overflow: visible; }
.grid-lines path { fill: none; stroke: var(--line); stroke-width: 1; stroke-dasharray: 4 6; }
#chart-line { fill: none; stroke: var(--accent); stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; }
.chart-area { fill: color-mix(in srgb, var(--accent) 12%, transparent); }
.chart-dots circle { fill: var(--surface); stroke: var(--accent); stroke-width: 3; }
.chart-figure figcaption { color: var(--muted); font-size: .76rem; line-height: 1.5; }
.data-details { margin-top: 1rem; border-top: 1px solid var(--line); padding-top: .8rem; }
.data-details summary { cursor: pointer; color: var(--muted); font-size: .78rem; }

.signal, .tag { display: inline-flex; align-items: center; min-height: 1.8rem; padding: .3rem .65rem; border-radius: 999px; font-size: .72rem; font-weight: 750; white-space: nowrap; }
.signal.neutral, .tag.neutral { color: #805e20; background: #f3e6bd; }
.tag.buy { color: #23614d; background: #d8eee4; }.tag.wait { color: #9a462f; background: #f6ddd5; }.tag.pending { color: #5d6260; background: #e8e9e4; }
.strategy-action { margin-block: 2rem 1.4rem; padding-block: 1.5rem; border-block: 1px solid var(--line); }
.strategy-action > span { color: var(--muted); font-size: .72rem; }
.strategy-action > strong { display: block; margin-block: .35rem .8rem; font: 500 4.7rem/1 Georgia, serif; }
.strategy-action > strong small { font-size: 1.2rem; }
.meter { height: .42rem; overflow: hidden; border-radius: 999px; background: var(--paper); }
.meter i { display: block; width: 40%; height: 100%; background: var(--amber); }
.reason-list { margin: 0; padding: 0; list-style: none; }
.reason-list li { display: grid; grid-template-columns: 2rem 1fr; gap: .65rem; padding-block: .9rem; border-bottom: 1px solid var(--line); }
.reason-list li > span { color: var(--accent); font: italic 1rem Georgia, serif; }
.reason-list strong { font-size: .9rem; }.reason-list p { margin: .3rem 0 0; color: var(--muted); font-size: .78rem; line-height: 1.55; }
.strategy-note { margin: 1rem 0 0; color: var(--muted); font-size: .7rem; line-height: 1.5; }

.price-panel { margin-top: 1rem; }
.table-wrapper { max-width: 100%; margin-top: 1.4rem; overflow: auto; container-type: inline-size; }
table { width: 100%; border-collapse: separate; border-spacing: 0; font-variant-numeric: tabular-nums; }
caption { position: absolute; clip-path: inset(50%); width: 1px; height: 1px; overflow: hidden; }
th, td { padding: .9rem .7rem; border-bottom: 1px solid var(--line); text-align: start; white-space: nowrap; }
thead { position: sticky; inset-block-start: 0; z-index: 1; background: var(--surface); }
thead th { color: var(--muted); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; }
tbody th { font-size: .88rem; }
tbody td { font-size: .82rem; }
.pending-row { color: var(--muted); }

footer { max-width: 1440px; margin: auto; padding: 1.5rem clamp(1rem, 4vw, 4rem) 3rem; display: flex; justify-content: space-between; gap: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .72rem; }
footer p { margin: 0; } footer a { color: inherit; }

@container (width < 680px) {
  table, thead, tbody, tr, th, td { display: block; }
  thead { display: none; }
  tbody tr { margin-bottom: .8rem; padding: .4rem .8rem; border: 1px solid var(--line); border-radius: .8rem; }
  tbody th { padding-block: .8rem; font-size: 1rem; }
  tbody td { display: flex; justify-content: space-between; gap: 1rem; padding-block: .55rem; }
  tbody td::before { content: attr(data-label); color: var(--muted); }
  tbody td[colspan] { display: block; }
  tbody td[colspan]::before { content: none; }
}

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .market-pulse { max-width: 30rem; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: 1fr; }
  .kpi-card { min-height: 9.5rem; }
  .chart-meta { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
  .topbar { align-items: start; }
  .status { display: grid; grid-template-columns: auto 1fr; gap: .25rem .5rem; }
  .status time { grid-column: 2; padding: 0; border: 0; }
  .hero { padding-top: 3.5rem; }
  .section-head { align-items: stretch; flex-direction: column; }
  .range-tabs { align-self: start; }
  .chart-meta { grid-template-columns: 1fr 1fr; }
  .chart-meta label, .chart-meta select { grid-column: 1 / -1; }
  footer { flex-direction: column; }
}

@media (prefers-color-scheme: dark) {
  :root { --ink: #eff4ef; --muted: #a5b0aa; --paper: #121714; --surface: #19201c; --line: #344039; --accent: #ff7657; --blue: #79add2; }
  .signal.neutral, .tag.neutral { color: #f2d47f; background: #56451d; }
  .tag.buy { color: #9de1c5; background: #244c3e; }.tag.wait { color: #ffb09b; background: #572f26; }.tag.pending { color: #c4cac6; background: #3a403c; }
}

@media (forced-colors: active) {
  .metal-chip.is-active, .kpi-head > span, .metal-code { border: 1px solid CanvasText; }
  .spark, .chart-area { display: none; }
  #chart-line { stroke: CanvasText; }
}