@font-face {
  font-family: 'Fraunces Display';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/fraunces-600.woff2') format('woff2');
}
@font-face {
  font-family: 'JB Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/jbmono-400.woff2') format('woff2');
}
@font-face {
  font-family: 'JB Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/jbmono-600.woff2') format('woff2');
}

:root {
  --bg: #0d1220;
  --bg-panel: #141b2e;
  --bg-panel-2: #1a2338;
  --bg-input: #10182a;
  --ink: #eae6da;
  --ink-dim: #8891a8;
  --ink-faint: #545d75;
  --accent: #d4a24e;
  --accent-ink: #2a1c05;
  --rule: #263049;
  --rule-soft: #1c2540;
  --pos: #e2574c;
  --neg: #4fae7f;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  --font-display: 'Fraunces Display', Georgia, serif;
  --font-body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: 'JB Mono', ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f1e6;
    --bg-panel: #ffffff;
    --bg-panel-2: #eee8d6;
    --bg-input: #fbf9f2;
    --ink: #1c2130;
    --ink-dim: #5b6478;
    --ink-faint: #9aa2b5;
    --accent: #9c6b1f;
    --accent-ink: #fff6e6;
    --rule: #ddd6c0;
    --rule-soft: #e8e2cf;
    --pos: #c23b2f;
    --neg: #2f8c5c;
    --shadow: 0 20px 50px -24px rgba(60, 50, 20, 0.25);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background-image:
    radial-gradient(1200px 500px at 15% -10%, color-mix(in srgb, var(--accent) 10%, transparent), transparent),
    radial-gradient(900px 500px at 100% 0%, color-mix(in srgb, var(--accent) 6%, transparent), transparent);
}

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

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 24px 80px;
}

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.brand-mark { font-family: var(--font-display); font-size: 26px; letter-spacing: 0.01em; }
.brand-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.topbar-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-faint);
  text-align: right;
  line-height: 1.6;
}
.topbar-meta b { color: var(--ink-dim); font-weight: 600; }

/* ---------- Steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 30px;
}
.step-btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  background: var(--bg-panel);
  color: var(--ink-dim);
  font: inherit;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  transition: background 0.15s ease, color 0.15s ease;
}
.step-btn:disabled { cursor: not-allowed; opacity: 0.55; }
.step-btn:not(:disabled):hover { background: var(--bg-panel-2); }
.step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 1px solid var(--rule);
  display: grid; place-items: center;
  flex: none;
  color: var(--ink-faint);
}
.step-label { display: flex; flex-direction: column; gap: 1px; }
.step-title { font-size: 13.5px; font-weight: 600; }
.step-en { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; color: var(--ink-faint); text-transform: uppercase; }
.step-btn.active { background: var(--bg-panel-2); color: var(--ink); }
.step-btn.active .step-num { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.step-btn.done .step-num { border-color: var(--neg); color: var(--neg); }
.step-btn.active .step-title { color: var(--accent); }

.panel { display: none; animation: rise 0.4s ease; }
.panel.active { display: block; }
@media (prefers-reduced-motion: no-preference) {
  @keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--rule);
  border-radius: 4px;
  box-shadow: var(--shadow);
}
.card + .card { margin-top: 16px; }

.card-head {
  padding: 16px 20px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.card-head h2 { margin: 0; font-family: var(--font-display); font-weight: 600; font-size: 17px; }
.card-head .hint { font-size: 12px; color: var(--ink-faint); }

/* ---------- Setup panel ---------- */
.setup-grid { display: grid; grid-template-columns: 1.55fr 1fr; gap: 20px; align-items: start; }
@media (max-width: 860px) { .setup-grid { grid-template-columns: 1fr; } }

table.holdings { width: 100%; border-collapse: collapse; font-size: 13px; }
table.holdings th {
  text-align: left;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 600;
  padding: 10px 20px 8px;
  border-bottom: 1px solid var(--rule);
}
table.holdings td { padding: 9px 20px; border-bottom: 1px solid var(--rule-soft); vertical-align: middle; }
table.holdings tr:last-child td { border-bottom: none; }
.code-cell { display: flex; align-items: center; gap: 8px; }
.code-input {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  background: var(--bg-input);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 6px 8px;
  color: var(--ink);
  width: 92px;
  text-transform: uppercase;
}
.code-input:focus { outline: none; border-color: var(--accent); }
.name-cell { color: var(--ink-dim); font-size: 12.5px; }
.name-cell .zh { color: var(--ink); }
.tag {
  display: inline-block;
  font-size: 10.5px;
  letter-spacing: 0.04em;
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  color: var(--ink-dim);
  white-space: nowrap;
}
.tag.bond { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 50%, var(--rule)); }
.weight-input {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  width: 64px;
  background: var(--bg-input);
  border: 1px solid var(--rule);
  border-radius: 3px;
  color: var(--ink);
  padding: 6px 7px;
  font-size: 13px;
  text-align: right;
}
.weight-input:disabled { opacity: 0.4; }
.row-error td { background: color-mix(in srgb, var(--pos) 8%, transparent); }
.error-msg { color: var(--pos); font-size: 11.5px; margin-top: 2px; }
.remove-row {
  border: none; background: transparent; color: var(--ink-faint);
  cursor: pointer; font-size: 15px; padding: 2px 6px; line-height: 1;
}
.remove-row:hover { color: var(--pos); }

.weight-mode { display: flex; gap: 8px; padding: 14px 20px 4px; }
.mode-pill { flex: 1; border: 1px solid var(--rule); border-radius: 3px; padding: 10px 12px; cursor: pointer; font-size: 12.5px; color: var(--ink-dim); }
.mode-pill.selected { border-color: var(--accent); color: var(--ink); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.mode-pill b { display: block; font-size: 13px; color: inherit; margin-bottom: 2px; }
.mode-pill input { display: none; }

.field-group { padding: 18px 20px; display: grid; gap: 16px; }
.field { display: grid; gap: 6px; }
.field label { font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-faint); }
.field input, .field select {
  font-family: var(--font-mono);
  background: var(--bg-input);
  border: 1px solid var(--rule);
  border-radius: 3px;
  color: var(--ink);
  padding: 9px 10px;
  font-size: 13px;
  width: 100%;
}
.field input:focus, .field select:focus { outline: none; border-color: var(--accent); }
.field .row { display: flex; gap: 10px; }
.field .row > * { flex: 1; }
.sim-count-display { font-family: var(--font-mono); color: var(--accent); font-weight: 600; font-size: 14px; }

.cta-row { padding: 18px 20px 20px; display: flex; justify-content: space-between; align-items: center; gap: 10px; border-top: 1px solid var(--rule); }
.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13.5px;
  border-radius: 3px;
  border: 1px solid var(--rule);
  background: var(--bg-panel-2);
  color: var(--ink);
  padding: 11px 18px;
  cursor: pointer;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.ghost { background: transparent; }
.btn.small { padding: 6px 10px; font-size: 11.5px; }

.banner {
  margin: 0 20px 18px;
  padding: 12px 14px;
  border-radius: 3px;
  border: 1px solid color-mix(in srgb, var(--pos) 45%, var(--rule));
  background: color-mix(in srgb, var(--pos) 10%, transparent);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.6;
}
.banner b { color: var(--pos); }

/* ---------- Running panel ---------- */
.run-list { list-style: none; margin: 0; padding: 18px 20px 20px; display: grid; gap: 2px; }
.run-item { display: flex; align-items: center; gap: 14px; padding: 13px 4px; border-bottom: 1px solid var(--rule-soft); font-size: 13.5px; }
.run-item:last-child { border-bottom: none; }
.run-dot { width: 18px; height: 18px; border-radius: 50%; border: 1px solid var(--rule); display: grid; place-items: center; flex: none; font-size: 10px; color: var(--ink-faint); }
.run-item.done .run-dot { background: var(--neg); border-color: var(--neg); color: var(--bg); }
.run-item.active .run-dot { border-color: var(--accent); color: var(--accent); animation: pulse 1.4s ease-in-out infinite; }
.run-item.failed .run-dot { border-color: var(--pos); color: var(--pos); }
@media (prefers-reduced-motion: no-preference) {
  @keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 35%, transparent); } 50% { box-shadow: 0 0 0 5px transparent; } }
}
.run-title { flex: 1; }
.run-note { font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); }
.run-item.active .run-note { color: var(--accent); }

/* ---------- Results panel ---------- */
.kpi-strip { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; margin-bottom: 20px; }
.kpi { background: var(--bg-panel); padding: 16px 16px 14px; }
.kpi-label { font-size: 10.5px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 8px; }
.kpi-value { font-family: var(--font-mono); font-size: 22px; font-weight: 600; font-variant-numeric: tabular-nums; }
.kpi-value.pos { color: var(--pos); }
.kpi-value.neg { color: var(--neg); }
@media (max-width: 860px) { .kpi-strip { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 520px) { .kpi-strip { grid-template-columns: repeat(2, 1fr); } }

.chart-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 16px; }
@media (max-width: 900px) { .chart-grid { grid-template-columns: 1fr; } }
.chart-card.wide { grid-column: 1 / -1; }
.chart-body { padding: 16px 20px 20px; }
.plot-target { width: 100%; }

.corr-grid { display: grid; gap: 2px; }
.corr-cell { aspect-ratio: 1; display: grid; place-items: center; font-family: var(--font-mono); font-size: 10px; border-radius: 2px; color: var(--ink); }
.corr-head { font-size: 9.5px; color: var(--ink-faint); background: transparent !important; }

table.capm { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 12px; }
table.capm th, table.capm td { padding: 7px 4px; text-align: right; border-bottom: 1px solid var(--rule-soft); }
table.capm th:first-child, table.capm td:first-child { text-align: left; }
table.capm th { color: var(--ink-faint); font-weight: 500; font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.04em; }
table.capm .sig { color: var(--accent); }

.footnote { margin-top: 18px; padding: 14px 18px; border: 1px dashed var(--rule); border-radius: 4px; font-size: 12px; color: var(--ink-dim); line-height: 1.7; }
.footnote b { color: var(--ink); }
.footnote code { font-family: var(--font-mono); background: var(--bg-input); padding: 1px 5px; border-radius: 2px; }

.download-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-dim);
  border: 1px solid var(--rule); border-radius: 3px; padding: 5px 9px;
  background: var(--bg-input); cursor: pointer;
}
.download-btn:hover { color: var(--accent); border-color: var(--accent); }

.spinner-inline {
  display: inline-block; width: 12px; height: 12px; border-radius: 50%;
  border: 2px solid var(--rule); border-top-color: var(--accent);
  animation: spin 0.7s linear infinite; margin-right: 6px; vertical-align: -1px;
}
@keyframes spin { to { transform: rotate(360deg); } }