/* Lottery Guru dashboard — no build step, no dependencies.
   Theme: rigorous stats tracker, not lottery hype. z≈0 is the expected result,
   so the z gradient is a single hue whose saturation grows with |z| in either
   direction — deliberately not red/green, not "hot numbers". */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef0f4;
  --text: #1a1f27;
  --text-muted: #5b6472;
  --border: #d9dee6;
  --accent: #4056a1;        /* brand indigo */
  --accent-soft: #e3e8f7;
  --z-accent: 64, 86, 161;  /* RGB triplet of the z-gradient hue */
  --ball-bg: #ffffff;
  --ball-border: #c3cad6;
  --special-bg: #fff3d6;
  --special-border: #e0b64f;
  --hit-bg: #dcefe2;
  --hit-border: #4f9d69;
  --z-alpha-max: 0.55;
  --shadow: 0 1px 3px rgba(16, 20, 28, 0.08);
}

/* OS dark preference applies before/without JS; an explicit data-theme
   choice (set by the toggle) always wins in both directions. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12151b;
    --surface: #1a1f27;
    --surface-2: #232935;
    --text: #e7eaf0;
    --text-muted: #98a1b0;
    --border: #313947;
    --accent: #8ea2e8;
    --accent-soft: #232c45;
    --z-accent: 142, 162, 232;
    --ball-bg: #232935;
    --ball-border: #455061;
    --special-bg: #3a2f14;
    --special-border: #b28a2e;
    --hit-bg: #1c3626;
    --hit-border: #3f7f56;
    --z-alpha-max: 0.42;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    color-scheme: dark;
  }
}

[data-theme="dark"] {
  --bg: #12151b;
  --surface: #1a1f27;
  --surface-2: #232935;
  --text: #e7eaf0;
  --text-muted: #98a1b0;
  --border: #313947;
  --accent: #8ea2e8;
  --accent-soft: #232c45;
  --z-accent: 142, 162, 232;
  --ball-bg: #232935;
  --ball-border: #455061;
  --special-bg: #3a2f14;
  --special-border: #b28a2e;
  --hit-bg: #1c3626;
  --hit-border: #3f7f56;
  --z-alpha-max: 0.42;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

html { color-scheme: light; }
[data-theme="dark"] { color-scheme: dark; }

/* visually hidden, still announced by screen readers */
.vh {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: var(--surface-2);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

/* ---------- header ---------- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.1rem 1.25rem 0.9rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}
.brand { display: flex; gap: 0.75rem; align-items: center; }
.brand-mark { font-size: 2rem; }
.brand h1 { margin: 0; font-size: 1.45rem; letter-spacing: -0.01em; }
.tagline { margin: 0.1rem 0 0; color: var(--text-muted); font-size: 0.92rem; }
.header-meta { display: flex; align-items: center; gap: 0.75rem; }
.updated-stamp { color: var(--text-muted); font-size: 0.85rem; }
.theme-toggle {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1.1rem;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent); }

.disclaimer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem 1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
  border-left: none;
}
.disclaimer strong { color: var(--text); }

/* ---------- tabs ---------- */
.tabs {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.tab {
  appearance: none;
  background: none;
  border: none;
  border-bottom: 2.5px solid transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 550;
  padding: 0.65rem 0.9rem;
  cursor: pointer;
  white-space: nowrap;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tab:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* ---------- panels ---------- */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}
.panel { display: none; }
.panel.active { display: block; }
.panel-intro h2 { margin: 0 0 0.35rem; font-size: 1.2rem; }
.summary-line { margin: 0 0 1rem; color: var(--text-muted); font-size: 0.95rem; }

.controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.filter-input, select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  font-size: 0.92rem;
  padding: 0.4rem 0.7rem;
}
.filter-input { min-width: 220px; }
.filter-input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.select-label { font-size: 0.9rem; color: var(--text-muted); display: flex; gap: 0.5rem; align-items: center; }

/* ---------- tables ---------- */
.table-scroll {
  overflow: auto;
  max-height: 75vh; /* gives the sticky header a scroll container to stick in */
  border-radius: 10px;
  box-shadow: var(--shadow);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  font-size: 0.92rem;
}
.data-table th, .data-table td {
  padding: 0.55rem 0.8rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table th {
  background: var(--surface-2);
  font-weight: 600;
  user-select: none;
  position: sticky;
  top: 0;
  z-index: 1;
}
/* sortable headers are real buttons (keyboard + AT for free) */
.sort-btn {
  appearance: none;
  background: none;
  border: none;
  color: inherit;
  font: inherit;
  font-weight: inherit;
  padding: 0;
  cursor: pointer;
}
.sort-btn:hover { color: var(--accent); }
.sort-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.data-table th[aria-sort]::after { color: var(--accent); font-size: 0.8em; margin-left: 0.35em; }
.data-table th[aria-sort="ascending"]::after { content: "▲"; }
.data-table th[aria-sort="descending"]::after { content: "▼"; }
.data-table tbody tr:hover { background: var(--surface-2); }
.data-table td.num { font-variant-numeric: tabular-nums; }

/* strategy name pill */
.strategy-name {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.15em 0.5em;
  border-radius: 999px;
}
[data-theme="dark"] .strategy-name { color: var(--text); }

/* z-gradient cell: --t in [0,1] = |z| / 3 clamped. Single hue, symmetric —
   deliberately not red/green; distance from chance, not "winning".
   --z-alpha-max is lower in dark mode to keep AA text contrast at full |z|. */
td.z-cell {
  background: rgba(var(--z-accent), calc(var(--t, 0) * var(--z-alpha-max)));
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

/* n < MIN_N: the row stays on the board but is greyed — z/p are shown, not
   endorsed. The z gradient is dimmed too so a lucky small-n arm never glows. */
tr.insufficient td { color: var(--text-muted); }
tr.insufficient td.z-cell { opacity: 0.55; font-weight: 400; }
.sample-flag { font-size: 0.78rem; font-style: italic; color: var(--text-muted); }

/* ---------- number balls ---------- */
.balls { display: inline-flex; gap: 0.3rem; align-items: center; flex-wrap: wrap; }
.ball {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.9em;
  height: 1.9em;
  border-radius: 50%;
  background: var(--ball-bg);
  border: 1.5px solid var(--ball-border);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  font-weight: 600;
}
.ball.special { background: var(--special-bg); border-color: var(--special-border); border-style: dashed; }
.ball.hit {
  background: var(--hit-bg);
  border-color: var(--hit-border);
  /* non-color cue so matches survive grayscale */
  text-decoration: underline;
  text-underline-offset: 2px;
}
.digit-row .ball { border-radius: 6px; }

/* picks group cards */
.picks-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
  overflow: hidden;
}
.picks-group h3 {
  margin: 0;
  padding: 0.7rem 1rem;
  font-size: 1rem;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
}
.picks-group h3 .kind-tag {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.picks-group .table-scroll { border-radius: 0; box-shadow: none; }

.reading-note {
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  max-width: 70ch;
}

.empty-note { color: var(--text-muted); font-style: italic; padding: 1.5rem 0; }

/* leaderboard game section */
.game-board h3 { margin: 0 0 0.2rem; font-size: 1.05rem; }
.game-board .null-line { margin: 0 0 0.75rem; color: var(--text-muted); font-size: 0.88rem; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 1.25rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
}
.site-footer p { max-width: 1100px; margin: 0.25rem auto; }
.footer-fine { font-size: 0.8rem; }

@media (max-width: 640px) {
  body { font-size: 15px; }
  .header-inner { padding: 0.9rem 1rem 0.6rem; }
  .brand h1 { font-size: 1.2rem; }
  main { padding: 1rem 0.9rem 2rem; }
  .data-table th, .data-table td { padding: 0.45rem 0.55rem; }
}