:root {
  color-scheme: light;
  --bg: #f4f4f1;
  --surface: #fcfcfb;
  --border: #e3e2dc;
  --grid: #ecebe6;
  --text: #0b0b0b;
  --text-2: #52514e;
  --muted: #74736d;
  --primary: #2a78d6;
  --primary-ink: #ffffff;
  --series-1: #2a78d6;
  --series-1-strong: #1c5cab;
  --series-2: #eb6834;
  --seats: #0b0b0b;
  --best: #1baf7a;
  --error: #c62f2e;
  --warn-bg: #fff4dc;
  --warn-ink: #6b4a00;
  --radius: 12px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #111110;
    --surface: #1a1a19;
    --border: #2e2e2c;
    --grid: #262624;
    --text: #f0efec;
    --text-2: #c3c2b7;
    --muted: #9a998f;
    --primary: #3987e5;
    --series-1: #3987e5;
    --series-1-strong: #86b6ef;
    --series-2: #d95926;
    --seats: #f0efec;
    --best: #199e70;
    --error: #e66767;
    --warn-bg: #3a2e10;
    --warn-ink: #f2d38a;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111110; --surface: #1a1a19; --border: #2e2e2c; --grid: #262624;
  --text: #f0efec; --text-2: #c3c2b7; --muted: #9a998f; --primary: #3987e5;
  --series-1: #3987e5; --series-1-strong: #86b6ef; --series-2: #d95926;
  --seats: #f0efec; --best: #199e70; --error: #e66767; --warn-bg: #3a2e10; --warn-ink: #f2d38a;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--text); line-height: 1.45; font-size: 15px; }
[hidden] { display: none !important; }
h1 { font-size: 22px; margin: 0 0 6px; }
h2 { font-size: 16px; margin: 0 0 4px; }
.muted { color: var(--muted); margin: 0 0 12px; font-size: 14px; }

.topbar {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 12px 16px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; white-space: nowrap; }
.brand svg { width: 26px; height: 26px; fill: var(--primary); transform: rotate(45deg); }
.brand small { font-weight: 400; color: var(--muted); margin-left: 4px; }
.user { display: flex; align-items: center; gap: 10px; color: var(--text-2); min-width: 0; }
#user-login { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

main { max-width: 1120px; margin: 0 auto; padding: 20px 16px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }

label { display: grid; gap: 6px; font-size: 13px; color: var(--text-2); }
input, select {
  font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; padding: 9px 10px; width: 100%; min-width: 0;
}
input:focus-visible, select:focus-visible, button:focus-visible { outline: 2px solid var(--primary); outline-offset: 1px; }
input[type="range"] { padding: 0; accent-color: var(--primary); background: none; border: 0; }

.btn { font: inherit; border-radius: 8px; padding: 10px 16px; cursor: pointer; border: 1px solid transparent; }
.btn.primary { background: var(--primary); color: var(--primary-ink); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--text-2); border-color: var(--border); }
.btn.ghost:hover { color: var(--text); }
.btn.small { padding: 6px 12px; font-size: 13px; }

.error { color: var(--error); margin: 0; font-size: 14px; }
.error:empty { display: none; }
.hint { font-size: 13px; color: var(--muted); margin: 0; }
.warning { background: var(--warn-bg); color: var(--warn-ink); border-radius: 8px; padding: 10px 12px; margin: 0; font-size: 14px; }

/* Вход */
.auth { max-width: 400px; width: 100%; margin: 40px auto; }
.auth form { display: grid; gap: 14px; }
.tabs { display: flex; gap: 4px; background: var(--bg); padding: 4px; border-radius: 10px; margin-bottom: 16px; }
.tab { flex: 1; font: inherit; border: 0; background: none; color: var(--text-2); padding: 8px; border-radius: 7px; cursor: pointer; }
.tab.active { background: var(--surface); color: var(--text); font-weight: 600; box-shadow: 0 1px 2px rgb(0 0 0 / 0.08); }

/* Форма прогноза */
.form-grid { display: grid; grid-template-columns: 1fr 1.3fr 1fr 1.6fr auto; gap: 14px; align-items: start; }
.form-grid .wide { grid-column: 1 / -1; }
.price-field { position: relative; }
.range-scale { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin-top: -4px; }
/* выровнять кнопку по полям, а не по подписям */
.form-grid > .btn { margin-top: 25px; }

/* Результат */
#app-view { display: grid; gap: 16px; }
#result { display: grid; gap: 14px; }
.route-title { margin: 0; font-size: 18px; font-weight: 600; }
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; display: grid; gap: 2px; align-content: start; }
.stat .label { font-size: 13px; color: var(--text-2); }
.stat .value { font-size: 30px; font-weight: 600; }
.stat .sub { font-size: 12px; color: var(--muted); }
.stat.accent { border-color: var(--primary); box-shadow: inset 0 0 0 1px var(--primary); }

.charts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; align-items: start; }
.formula { margin: 0; }
.chart-card { display: grid; gap: 8px; align-content: start; min-width: 0; }
.chart-card .muted { margin: 0; }
.chart-box { position: relative; height: 300px; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 13px; color: var(--text-2); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.sw { display: inline-block; width: 12px; height: 12px; border-radius: 3px; }
.sw-buys { background: var(--series-1); }
.sw-over { background: var(--series-2); }
.sw-seats { height: 2px; width: 16px; border-radius: 0; background: var(--seats); }
.sw-line { height: 2px; width: 16px; border-radius: 0; background: var(--series-1); }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; }
.dot-cur { background: var(--series-2); }
.dot-best { background: var(--best); }
.callout { margin: 0; font-size: 14px; color: var(--text-2); }
.callout b { color: var(--text); }
.note { margin: 0; font-size: 12px; color: var(--muted); }
details summary { cursor: pointer; font-size: 13px; color: var(--text-2); }
.tbl { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 13px; font-variant-numeric: tabular-nums; }
.tbl th, .tbl td { text-align: right; padding: 4px 6px; border-bottom: 1px solid var(--grid); }
.tbl th:first-child, .tbl td:first-child { text-align: left; }
.tbl th { font-weight: 500; color: var(--text-2); }
.tbl tr.median td { font-weight: 600; }
#use-best { justify-self: start; }

/* История */
.history ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.history li button {
  width: 100%; text-align: left; font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; cursor: pointer;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.history li button:hover { border-color: var(--primary); }
.history .h-meta { color: var(--muted); font-size: 13px; }

.foot { text-align: center; padding: 8px 16px 24px; font-size: 13px; }

@media (max-width: 900px) {
  .form-grid { grid-template-columns: 1fr 1fr; }
  .form-grid .price-field { grid-column: 1 / -1; }
  .form-grid > .btn { grid-column: 1 / -1; margin-top: 0; }
  .charts { grid-template-columns: minmax(0, 1fr); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 480px) {
  .stat .value { font-size: 24px; }
  .chart-box { height: 260px; }
  .brand small { display: none; }
}
.foot a { color: var(--text-2); }