:root {
  --radius: 8px;
  /* Light theme (default) */
  --base-bg: #F0F4FC;
  --surface-card: #FFFFFF;
  --border-divider: #D1DCE5;
  --text-primary: #1C1D21;
  --text-secondary: #6E7C8C;
  --accent: #3A86FF;              /* sky-blue interactive accent */
  --accent-contrast: #FFFFFF;
  --chart-gradient: #4EA8DE;      /* P1-3 charts */
  --signal-win: #2ECC71;
  --signal-win-bg: rgba(46, 204, 113, 0.12);
  --signal-loss: #E11D48;
  --signal-loss-bg: rgba(225, 29, 72, 0.12);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --base-bg: #1E1E2F;
    --surface-card: #2A2A3F;
    --border-divider: #3B3B5D;
    --text-primary: #FFFFFF;
    --text-secondary: #A0AEC0;
    --accent: #3A86FF;
    --accent-contrast: #FFFFFF;
    --chart-gradient: #4EA8DE;
    --signal-win: #48BB78;
    --signal-win-bg: rgba(72, 187, 120, 0.15);
    --signal-loss: #D53F8C;
    --signal-loss-bg: rgba(213, 63, 140, 0.15);
  }
}
:root[data-theme="dark"] {
  --base-bg: #1E1E2F;
  --surface-card: #2A2A3F;
  --border-divider: #3B3B5D;
  --text-primary: #FFFFFF;
  --text-secondary: #A0AEC0;
  --accent: #3A86FF;
  --accent-contrast: #FFFFFF;
  --chart-gradient: #4EA8DE;
  --signal-win: #48BB78;
  --signal-win-bg: rgba(72, 187, 120, 0.15);
  --signal-loss: #D53F8C;
  --signal-loss-bg: rgba(213, 63, 140, 0.15);
}
* { box-sizing: border-box; }
body { font-family: system-ui, sans-serif; margin: 0; background: var(--base-bg); color: var(--text-primary); }
.nav { display: flex; align-items: center; gap: .75rem; padding: .75rem 1.25rem; background: var(--surface-card); border-bottom: 1px solid var(--border-divider); }
.nav .brand { font-weight: 700; color: var(--accent); letter-spacing: .02em; }
.nav .spacer { flex: 1; }
.nav .user { color: var(--text-secondary); }
.main { max-width: 30rem; margin: 2.5rem auto; padding: 0 1.25rem; }
h1 { font-size: 1.5rem; } h2 { font-size: 1.15rem; }
label { display: block; margin: .75rem 0; color: var(--text-secondary); font-size: .9rem; }
input { display: block; width: 100%; margin-top: .3rem; padding: .6rem .7rem; font-size: 1rem;
  color: var(--text-primary); background: var(--base-bg); border: 1px solid var(--border-divider); border-radius: var(--radius); }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
button { font: inherit; font-weight: 600; padding: .55rem 1.1rem; margin-top: .6rem; border: 0;
  border-radius: var(--radius); background: var(--accent); color: var(--accent-contrast); cursor: pointer; }
button:hover { filter: brightness(1.05); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--border-divider); }
#logout-btn, #theme-toggle { background: transparent; color: var(--text-secondary); border: 1px solid var(--border-divider); padding: .4rem .7rem; margin-top: 0; }
.error { color: var(--signal-loss); margin-top: .75rem; }
ul { padding-left: 1.1rem; }
/* Shared design-system classes — defined now, consumed from P1-3 (cards, LONG/SHORT badges) */
.dashboard-card { background: var(--surface-card); border: 1px solid var(--border-divider); border-radius: var(--radius); padding: 16px; }
.badge-long { background: var(--signal-win-bg); color: var(--signal-win); border-radius: var(--radius); font-weight: 600; padding: 4px 8px; }
.badge-short { background: var(--signal-loss-bg); color: var(--signal-loss); border-radius: var(--radius); font-weight: 600; padding: 4px 8px; }
/* P1-3 scanner UI */
.nav-link { margin-right: 1rem; color: var(--accent); text-decoration: none; }
.nav-link:hover { text-decoration: underline; }
.preset-list { list-style: none; padding: 0; margin: 0; }
.preset-row { display: flex; justify-content: space-between; align-items: center; gap: .5rem; padding: .5rem 0; }
.preset-actions button { margin-top: 0; margin-left: .3rem; padding: .35rem .7rem; }
.error-banner { color: var(--signal-loss); font-weight: 600; margin: .5rem 0; }
.muted { color: var(--text-secondary); }
.results-scroll { overflow-x: auto; max-width: 100%; }
.results-table { border-collapse: collapse; width: 100%; }
.results-table th, .results-table td { padding: .4rem .6rem; border-bottom: 1px solid var(--border-divider); text-align: left; white-space: nowrap; }
.result-row { cursor: pointer; }
.result-row:hover { background: var(--signal-win-bg); }
.result-detail { display: grid; grid-template-columns: max-content 1fr; gap: .2rem 1rem; margin: .5rem 0; }
.detail-pair { display: contents; }
.detail-pair dt { color: var(--text-secondary); }