/* Vietlott number generator - design tokens follow the validated reference
   palette (blue sequential for magnitude charts, status colours reserved). */

:root {
  color-scheme: light;

  --plane: #f9f9f7;
  --surface: #fcfcfb;
  --surface-2: #f2f1ed;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --line: #c3c2b7;

  --series-1: #2a78d6;
  --series-1-soft: #86b6ef;   /* lightest ordinal step that clears 2:1 on light */
  --series-2: #eb6834;

  --good: #0ca30c;
  --warning: #fab219;
  --critical: #d03b3b;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgba(11, 11, 11, 0.06), 0 8px 24px rgba(11, 11, 11, 0.05);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --plane: #0d0d0d;
    --surface: #1a1a19;
    --surface-2: #232321;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --line: #383835;
    --series-1: #3987e5;
    --series-1-soft: #184f95;
    --series-2: #d95926;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --plane: #0d0d0d;
  --surface: #1a1a19;
  --surface-2: #232321;
  --ink: #ffffff;
  --ink-2: #c3c2b7;
  --muted: #898781;
  --grid: #2c2c2a;
  --line: #383835;
  --series-1: #3987e5;
  --series-1-soft: #184f95;
  --series-2: #d95926;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--plane);
  color: var(--ink);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

h1, h2, h3 { margin: 0; font-weight: 620; letter-spacing: -0.01em; }
h1 { font-size: 17px; }
h2 { font-size: 15px; }
h3 { font-size: 13px; color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.04em; }
p { margin: 0 0 10px; }

a { color: var(--series-1); }

/* ---------- shell ---------- */

.app {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 16px 64px;
}

header.top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--plane) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--grid);
  margin: 0 0 20px;
  padding: 12px 0;
}

.top-row {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 9px; margin-right: auto; }
.brand .dot {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--series-1); color: #fff;
  display: grid; place-items: center;
  font-size: 11px; font-weight: 700;
}
.brand small { display: block; color: var(--muted); font-size: 11px; font-weight: 400; }

.tabs {
  display: flex;
  gap: 2px;
  background: var(--surface-2);
  padding: 3px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  overflow-x: auto;
}
.tabs button {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--ink-2);
  font: inherit;
  font-size: 14px;
  padding: 7px 14px;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
}
.tabs button[aria-selected="true"] {
  background: var(--surface);
  color: var(--ink);
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(0,0,0,0.08);
}

.panel { display: none; }
.panel.active { display: block; }

/* ---------- cards ---------- */

.card {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
.card + .card { margin-top: 16px; }
.card-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.card-head .sub { color: var(--muted); font-size: 12px; }

/* minmax(0, ...) lets a track shrink below its contents' min-content width,
   which keeps wide children (tables, selects) from stretching the page. */
.grid-2 { display: grid; grid-template-columns: minmax(280px, 340px) minmax(0, 1fr); gap: 16px; align-items: start; }
.grid-halves { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }

@media (max-width: 860px) {
  .grid-2, .grid-halves { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- controls ---------- */

label.field { display: block; margin-bottom: 12px; }
label.field > span {
  display: block;
  font-size: 12px;
  color: var(--ink-2);
  margin-bottom: 4px;
  font-weight: 550;
}
label.field .hint { color: var(--muted); font-weight: 400; }

select, input[type="number"], input[type="text"], input[type="date"] {
  width: 100%;
  min-width: 0;
  font: inherit;
  font-size: 14px;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
}
select:focus-visible, input:focus-visible, button:focus-visible {
  outline: 2px solid var(--series-1);
  outline-offset: 1px;
}

input[type="range"] { width: 100%; accent-color: var(--series-1); }
.range-row { display: flex; align-items: center; gap: 10px; }
.range-row output { font: 13px var(--mono); color: var(--ink-2); min-width: 34px; text-align: right; }

.check { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-2); margin-bottom: 10px; }
.check input { accent-color: var(--series-1); }

button.btn {
  font: inherit;
  font-size: 14px;
  font-weight: 560;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}
button.btn:hover:not(:disabled) { background: var(--surface-2); }
button.btn.primary {
  background: var(--series-1);
  border-color: var(--series-1);
  color: #fff;
}
button.btn.primary:hover:not(:disabled) { filter: brightness(1.07); }
button.btn:disabled { opacity: 0.5; cursor: not-allowed; }
button.btn.wide { width: 100%; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- balls ---------- */

.ticket {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-sm);
  background: var(--surface);
  flex-wrap: wrap;
}
.ticket + .ticket { margin-top: 8px; }
.ticket .idx { color: var(--muted); font: 12px var(--mono); min-width: 24px; }

.ball {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: grid; place-items: center;
  font: 600 15px var(--mono);
  background: var(--series-1);
  color: #fff;
  flex: 0 0 auto;
}
.ball.sm { width: 28px; height: 28px; font-size: 12px; }
.ball.bonus { background: var(--series-2); }
.ball.ghost { background: var(--surface-2); color: var(--ink-2); border: 1px solid var(--line); }
.ball-row { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
/* Inside a table the cell is narrow, so wrapping stacks the balls one per line
   and the row becomes enormously tall. Keep them on one line and let
   .table-wrap scroll sideways instead. */
table.data .ball-row { flex-wrap: nowrap; }
.ball-sep { color: var(--muted); font-size: 18px; padding: 0 2px; }

.tags { display: flex; gap: 6px; margin-left: auto; flex-wrap: wrap; }
.tag {
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid var(--grid);
  background: var(--surface-2);
  color: var(--ink-2);
  white-space: nowrap;
}
.tag.good { color: var(--good); border-color: color-mix(in srgb, var(--good) 40%, var(--grid)); }
.tag.warn { color: var(--warning); border-color: color-mix(in srgb, var(--warning) 40%, var(--grid)); }
.tag.crit { color: var(--critical); border-color: color-mix(in srgb, var(--critical) 40%, var(--grid)); }

/* ---------- stat tiles ---------- */

.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.tile {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.tile .k { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.tile .v { font: 600 22px/1.25 -apple-system, BlinkMacSystemFont, sans-serif; letter-spacing: -0.02em; margin-top: 3px; }
.tile .v.mono { font-family: var(--mono); font-size: 19px; }
.tile .s { font-size: 12px; color: var(--ink-2); margin-top: 2px; }
.tile .v.pos { color: var(--good); }
.tile .v.neg { color: var(--critical); }

/* ---------- table ---------- */

.table-wrap { overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; font-size: 13px; }
table.data th, table.data td {
  text-align: left;
  padding: 7px 10px;
  border-bottom: 1px solid var(--grid);
  white-space: nowrap;
}
table.data th {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  font-weight: 600;
  position: sticky;
  top: 0;
  background: var(--surface);
}
table.data td.num { text-align: right; font-family: var(--mono); }
table.data tbody tr:hover { background: var(--surface-2); }
table.data td.best { font-weight: 650; color: var(--series-1); }

/* ---------- chart ---------- */

.chart { position: relative; }
/* The SVG carries its own pixel width/height; chart.js re-renders on resize. */
.chart svg { display: block; }
.chart .bar { fill: var(--series-1); }
.chart .bar.dim { fill: var(--series-1-soft); }
.chart .hit { fill: transparent; cursor: pointer; }
.chart .hit:hover + .bar, .chart .bar.hover { filter: brightness(1.15); }
.chart .grid-line { stroke: var(--grid); stroke-width: 1; }
.chart .axis-line { stroke: var(--line); stroke-width: 1; }
.chart text { fill: var(--muted); font-size: 10px; font-family: var(--mono); }
.chart text.val { fill: var(--ink-2); font-size: 10px; }

.tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--ink);
  color: var(--plane);
  padding: 6px 9px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  line-height: 1.4;
  white-space: nowrap;
  transform: translate(-50%, -125%);
  opacity: 0;
  transition: opacity 0.1s;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.tooltip.show { opacity: 1; }
.tooltip b { font-family: var(--mono); }

/* ---------- status / log ---------- */

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--ink-2);
  padding: 4px 9px;
  border: 1px solid var(--grid);
  border-radius: 999px;
  background: var(--surface);
}
.status .led { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); flex: 0 0 auto; }
.status .led.live { background: var(--good); }
.status .led.warn { background: var(--warning); }
.status .led.off { background: var(--critical); }

.log {
  font: 12px/1.6 var(--mono);
  background: var(--surface-2);
  border: 1px solid var(--grid);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  max-height: 220px;
  overflow: auto;
  white-space: pre-wrap;
  color: var(--ink-2);
}

.note {
  font-size: 12.5px;
  color: var(--ink-2);
  background: var(--surface-2);
  border-left: 3px solid var(--series-1);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 9px 12px;
  margin: 12px 0 0;
}
.note.warn { border-left-color: var(--warning); }
.note strong { color: var(--ink); }

.muted { color: var(--muted); }
.mono { font-family: var(--mono); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.spinner {
  width: 13px; height: 13px;
  border: 2px solid var(--line);
  border-top-color: var(--series-1);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
  vertical-align: -2px;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation-duration: 3s; } }

footer.foot {
  margin-top: 28px;
  padding-top: 14px;
  border-top: 1px solid var(--grid);
  font-size: 12px;
  color: var(--muted);
}

/* ---------- iOS / touch ---------- */

/* Safari zooms the whole page when a focused control is under 16px, which
   leaves the layout scrolled sideways. Touch pointers get 16px controls. */
@media (pointer: coarse) {
  select,
  input[type="number"],
  input[type="text"],
  input[type="date"] {
    font-size: 16px;
    padding: 9px 10px;
  }

  button.btn { padding: 11px 16px; }          /* ~44px tall touch targets */
  .tabs button { padding: 10px 16px; }
  .check { padding: 4px 0; }
  .check input { width: 20px; height: 20px; }
  input[type="range"] { height: 28px; }
}

/* Notch and home-indicator insets, which apply once installed to the Home
   Screen and the web view goes full-bleed. */
@supports (padding: max(0px)) {
  header.top { padding-top: max(12px, env(safe-area-inset-top)); }

  .top-row {
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
  }

  .app {
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
    padding-bottom: max(64px, calc(env(safe-area-inset-bottom) + 48px));
  }
}

/* Rubber-banding the page behind a sticky header looks broken on iOS. */
body { overscroll-behavior-y: none; }

.hide-narrow { display: inline; }

@media (max-width: 560px) {
  .brand small { display: none; }
  .hide-narrow { display: none; }
  .tabs { overflow-x: visible; }
  .tabs button { padding: 10px 4px; font-size: 13.5px; }
  h1 { font-size: 16px; }
  .top-row { gap: 8px; }
  #product { flex: 1 1 auto; min-width: 0; }
  .tiles { grid-template-columns: repeat(auto-fit, minmax(132px, 1fr)); }
  .ball { width: 34px; height: 34px; font-size: 14px; }
  .card { padding: 14px; }
}

/* Prize table editor: label left, amount right, compact enough for ten rows. */
label.field.prize-row {
  display: grid;
  grid-template-columns: 1fr minmax(0, 130px);
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
label.field.prize-row > span { margin-bottom: 0; }
label.field.prize-row input { text-align: right; font-family: var(--mono); }