/* ------------------------------------------------------------------
   RiverCalc

   Предмет — линейная шкала километров реки. Отсюда всё остальное:
   вертикальная ось как главный элемент, холодная палитра навигационной
   карты, настоящий чёрный текст, один сигнальный красный только на том,
   что человек выбрал. Крупный кегль: читают люди за пятьдесят, часто
   с телефона, часто на солнце в рубке.
   ------------------------------------------------------------------ */

@font-face {
  font-family: 'Golos Text';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('/fonts/golos-text-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'Golos Text';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('/fonts/golos-text-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+2000-206F, U+2212, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'PT Sans Narrow';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/pt-sans-narrow-400-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'PT Sans Narrow';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/pt-sans-narrow-400-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+2000-206F, U+2212;
}
@font-face {
  font-family: 'PT Sans Narrow';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/fonts/pt-sans-narrow-700-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

:root {
  --paper: #ffffff;
  --panel: #eef2f4;
  --panel-deep: #dfe6ea;
  --ink: #000000;
  --ink-soft: #46535c;
  --water: #0f5c7a;
  --water-pale: #cfe0e8;
  --signal: #b4321f;

  --rule: 1px solid var(--panel-deep);
  --measure: 66ch;
  --gutter: clamp(1rem, 4vw, 2.5rem);

  --text: clamp(1.0625rem, 0.98rem + 0.4vw, 1.1875rem);
  --sans: 'Golos Text', 'Segoe UI', system-ui, sans-serif;
  --narrow: 'PT Sans Narrow', 'Golos Text', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 var(--text)/1.6 var(--sans);
  font-variant-numeric: tabular-nums;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { margin: 0; font-weight: 600; line-height: 1.2; letter-spacing: -0.012em; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
a { color: var(--water); text-underline-offset: 0.18em; }
a:hover { color: var(--signal); }
b, strong { font-weight: 600; }

:where(a, button, input, summary):focus-visible {
  outline: 3px solid var(--water);
  outline-offset: 2px;
}

.wrap {
  max-width: 68rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---- шапка ---------------------------------------------------------- */

.site-head {
  border-bottom: var(--rule);
  padding-block: 1rem;
}
.site-head .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 1.5rem;
}
.wordmark {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
}
.wordmark span { color: var(--water); }
.site-head nav {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.95rem;
}
.site-head nav a { color: var(--ink-soft); text-decoration: none; }
.site-head nav a:hover { color: var(--signal); text-decoration: underline; }

/* ---- первый экран --------------------------------------------------- */

.hero { padding-block: clamp(2rem, 6vw, 4rem) 1rem; }
.hero-grid {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3.5rem);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}
@media (min-width: 60rem) {
  .hero-grid { grid-template-columns: minmax(0, 1.15fr) minmax(19rem, 0.85fr); }
}

.hero h1 {
  font-size: clamp(1.9rem, 1.3rem + 2.6vw, 3.05rem);
  max-width: 18ch;
  margin-bottom: 0.7em;
}
.hero-lead {
  max-width: var(--measure);
  font-size: 1.08em;
  color: var(--ink-soft);
}
.hero-source {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: var(--rule);
  font-size: 0.95rem;
  color: var(--ink-soft);
  max-width: var(--measure);
}

/* ---- форма ---------------------------------------------------------- */

.finder {
  background: var(--panel);
  padding: clamp(1.1rem, 3vw, 1.6rem);
}
.finder h2 { font-size: 1.05rem; margin-bottom: 1rem; }
.field { position: relative; margin-bottom: 0.9rem; }
.field label {
  display: block;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 0.3rem;
}
.field input {
  width: 100%;
  padding: 0.7rem 0.8rem;
  font: inherit;
  color: var(--ink);
  background: var(--paper);
  border: 2px solid var(--panel-deep);
  border-radius: 0;
}
.field input:focus { border-color: var(--water); outline: none; }

.suggestions {
  position: absolute;
  z-index: 20;
  inset-inline: 0;
  top: 100%;
  max-height: 16rem;
  overflow-y: auto;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--paper);
  border: 2px solid var(--water);
  border-top: none;
}
.suggestions:empty { display: none; }
.suggestions li { padding: 0.5rem 0.8rem; cursor: pointer; }
.suggestions li[aria-selected='true'], .suggestions li:hover { background: var(--water-pale); }
.suggestions .basin { display: block; font-size: 0.82rem; color: var(--ink-soft); }

.finder button[type='submit'] {
  width: 100%;
  margin-top: 0.4rem;
  padding: 0.8rem 1rem;
  font: 600 1rem/1 var(--sans);
  color: var(--paper);
  background: var(--water);
  border: none;
  border-radius: 0;
  cursor: pointer;
}
.finder button[type='submit']:hover { background: var(--signal); }
.finder .swap {
  background: none;
  border: none;
  padding: 0.2rem 0;
  font: inherit;
  font-size: 0.9rem;
  color: var(--water);
  cursor: pointer;
  text-decoration: underline;
}
.finder-hint { margin-top: 0.9rem; font-size: 0.9rem; color: var(--ink-soft); }
.finder-hint button {
  background: none; border: none; padding: 0;
  font: inherit; color: var(--water); cursor: pointer; text-decoration: underline;
}

/* ---- шкала километров ----------------------------------------------- */

.scale { margin: 0; }
.scale-track {
  position: relative;
  height: clamp(26rem, 52vh, 34rem);
  margin-block: 1.6rem;
  margin-inline-start: 4.2rem;
}
.scale-axis {
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: 2px;
  background: var(--panel-deep);
}
.scale-span {
  position: absolute;
  left: -1px;
  width: 4px;
  background: var(--signal);
}
.scale-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.3rem 1rem;
  padding-bottom: 0.7rem;
  border-bottom: 2px solid var(--ink);
}
.scale-head-pair { font-weight: 600; font-size: 1.05rem; }
.scale-head-value { font-weight: 700; color: var(--signal); white-space: nowrap; }
.scale-point {
  position: absolute;
  left: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transform: translateY(-50%);
  white-space: nowrap;
}
.scale-km {
  position: absolute;
  right: calc(100% + 0.5rem);
  font: 400 0.9rem/1 var(--narrow);
  color: var(--ink-soft);
}
.scale-tick { width: 0.55rem; height: 2px; background: var(--panel-deep); }
.scale-name { font-size: 0.92rem; color: var(--ink-soft); }
.scale-point.is-marked .scale-km { color: var(--signal); font-weight: 700; }
.scale-point.is-marked .scale-tick { width: 1.1rem; height: 3px; background: var(--signal); }
.scale-point.is-marked .scale-name { color: var(--ink); font-weight: 600; font-size: 1rem; }
.scale-note {
  margin-top: 2.2rem;
  padding-top: 0.8rem;
  border-top: var(--rule);
  font-size: 0.88rem;
  color: var(--ink-soft);
  max-width: 46ch;
}

.scale-leg-note {
  margin-bottom: 1.1rem;
  padding: 0.7rem 0.8rem;
  background: var(--panel);
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* ---- секции --------------------------------------------------------- */

.band { padding-block: clamp(2.5rem, 7vw, 4.5rem); }
.band + .band { border-top: var(--rule); }
.band--panel { background: var(--panel); }
.band h2 {
  font-size: clamp(1.4rem, 1.1rem + 1.2vw, 1.9rem);
  margin-bottom: 0.6em;
  max-width: 24ch;
}
.band-lead { max-width: var(--measure); color: var(--ink-soft); margin-bottom: 2rem; }

/* ---- демонстрации --------------------------------------------------- */

.demo-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}
.demo-switch button {
  padding: 0.55rem 0.9rem;
  font: inherit;
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--paper);
  border: 2px solid var(--panel-deep);
  border-radius: 0;
  cursor: pointer;
}
.demo-switch button[aria-pressed='true'] {
  border-color: var(--water);
  background: var(--water);
  color: var(--paper);
}
.demo-panel[hidden] { display: none; }

/* ---- результат расчёта ---------------------------------------------- */

.result { display: grid; gap: 1.5rem; }
.result-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-bottom: 0.8rem;
  border-bottom: 3px solid var(--ink);
}
.route-title { font-size: clamp(1.25rem, 1rem + 1vw, 1.6rem); }
.route-title .arrow { margin-inline: 0.5em; color: var(--water); }
.route-total {
  margin: 0;
  font: 700 clamp(1.5rem, 1.1rem + 1.8vw, 2.2rem)/1 var(--sans);
  color: var(--signal);
}
.unit { font-size: 0.62em; font-weight: 400; color: var(--ink-soft); }

.variant + .variant { margin-top: 2rem; padding-top: 1.5rem; border-top: var(--rule); }
.variant-title {
  font-size: 1.05rem;
  margin-bottom: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
}
.variant-basin { font-weight: 400; font-size: 0.9rem; color: var(--ink-soft); }

.facts { display: flex; flex-wrap: wrap; gap: 1.5rem 2.5rem; margin: 0 0 1.4rem; }
.facts div { margin: 0; }
.facts dt { font-size: 0.88rem; color: var(--ink-soft); }
.facts dd { margin: 0.1rem 0 0; font-size: 1.15rem; font-weight: 600; }
.facts dd.big { font-size: 1.5rem; }

.table-scroll { overflow-x: auto; }
table.norms {
  width: 100%;
  min-width: 34rem;
  border-collapse: collapse;
  font-size: 0.97rem;
}
table.norms caption {
  text-align: left;
  font-size: 0.88rem;
  color: var(--ink-soft);
  padding-bottom: 0.5rem;
}
table.norms th, table.norms td {
  padding: 0.55rem 0.7rem;
  border-bottom: var(--rule);
  vertical-align: baseline;
}
table.norms thead th {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink-soft);
  border-bottom: 2px solid var(--ink);
  white-space: nowrap;
}
table.norms tbody th { font-weight: 400; text-align: left; }
table.norms th.num, table.norms td.num { text-align: right; width: 7.5rem; }
table.norms tbody tr:hover { background: var(--panel); }
.hours { font-weight: 600; }
.days { display: block; font-size: 0.8rem; color: var(--ink-soft); font-weight: 400; }
.absent { color: var(--ink-soft); }

.waypoints { margin-top: 1.4rem; font-size: 0.95rem; }
.waypoints summary { cursor: pointer; color: var(--water); }
.waypoint-list {
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
  columns: 2;
  column-gap: 2rem;
}
@media (max-width: 40rem) { .waypoint-list { columns: 1; } }
.waypoint-list li { break-inside: avoid; padding: 0.25rem 0; border-bottom: var(--rule); }
.waypoint-list li.lock .waypoint-name { color: var(--ink-soft); }
.waypoint-stop { float: right; color: var(--ink-soft); font-size: 0.88rem; }
.stop-item + .stop-item { margin-left: 0.6rem; }
.stop-category { display: none; }

.composite-note, .source-note, .warning, .footnote, .disclaimer, .notes {
  max-width: var(--measure);
  font-size: 0.93rem;
  color: var(--ink-soft);
}
.warning { border-left: 4px solid var(--signal); padding-left: 0.9rem; }
.disclaimer { padding-top: 1rem; border-top: var(--rule); }
.notes { margin: 1rem 0 0; padding-left: 1.1rem; }

.legs { margin: 0; padding: 0; list-style: none; counter-reset: leg; }
.leg + .leg { margin-top: 2rem; padding-top: 1.5rem; border-top: var(--rule); }
.leg-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
  font-size: 1.1rem;
  margin-bottom: 1rem;
}
.leg-number {
  min-width: 1.7rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--paper);
  font: 700 0.9rem/1 var(--narrow);
}
.leg-distance { margin-left: auto; color: var(--signal); font-weight: 700; }

.problem { max-width: var(--measure); }
.problem .hint { color: var(--ink-soft); font-size: 0.93rem; }
.option {
  margin: 0 0.4rem 0.4rem 0;
  padding: 0.45rem 0.8rem;
  font: inherit;
  background: var(--paper);
  border: 2px solid var(--water);
  cursor: pointer;
}

/* ---- охват ---------------------------------------------------------- */

.coverage { display: grid; gap: 0; max-width: 46rem; }
.coverage div {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: var(--rule);
}
.coverage dt { flex: 1; color: var(--ink-soft); }
.coverage dd {
  margin: 0;
  font: 700 1.35rem/1 var(--sans);
  min-width: 4.5rem;
  text-align: right;
}

/* ---- тарифы --------------------------------------------------------- */

.plans { width: 100%; border-collapse: collapse; }
.plans caption { text-align: left; padding-bottom: 0.8rem; color: var(--ink-soft); font-size: 0.93rem; }
.plans th, .plans td { padding: 0.8rem 0.7rem; border-bottom: var(--rule); text-align: left; vertical-align: baseline; }
.plans thead th { font-size: 0.86rem; color: var(--ink-soft); border-bottom: 2px solid var(--ink); }
.plans .price { font-weight: 700; white-space: nowrap; }
.plans tbody th { font-weight: 600; }
@media (max-width: 45rem) {
  .plans, .plans tbody, .plans tr, .plans td, .plans th { display: block; }
  .plans thead { display: none; }
  .plans tr { padding: 0.8rem 0; border-bottom: 2px solid var(--panel-deep); }
  .plans td, .plans tbody th { border: none; padding: 0.15rem 0; }
  .plans td::before { content: attr(data-label) ': '; color: var(--ink-soft); }
}

/* ---- как это работает ----------------------------------------------- */

.steps { margin: 0; padding: 0; list-style: none; display: grid; gap: 1.25rem; max-width: 52rem; }
.steps li { display: grid; grid-template-columns: 2rem 1fr; gap: 1rem; align-items: baseline; }
.steps .step-number { font: 700 1.1rem/1 var(--narrow); color: var(--water); }
.steps h3 { font-size: 1.05rem; margin-bottom: 0.25rem; }
.steps p { color: var(--ink-soft); font-size: 0.97rem; }

/* ---- подвал --------------------------------------------------------- */

.site-foot {
  border-top: 3px solid var(--ink);
  padding-block: 2.5rem 3.5rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.site-foot .wrap { display: grid; gap: 1.5rem; }
@media (min-width: 48rem) { .site-foot .wrap { grid-template-columns: 1fr 1fr; } }
.site-foot h2 { font-size: 0.95rem; color: var(--ink); margin-bottom: 0.4rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}