/* Nafas — visual system
   Paper + ink base, cobalt from Uzbek ceramics as the accent.
   The hero "sky" turns from clear blue to ochre haze as PM2.5 rises (--haze 0..1, set by app.js). */

:root {
  --paper: #f4f1ea;
  --paper-2: #ebe6db;
  --ink: #1a2229;
  --ink-2: #4f5a64;
  --rule: #d6cfbf;
  --accent: #1d44a8;
  --on-accent: #f4f1ea;
  --go: #0f7f78;
  --limit: #a86a12;
  --stay: #b43f2b;
  --sky-clean: #bcdcef;
  --sky-smog: #cdb68a;
  --sky-ink: #10202e;
  --haze: 0.3;
  --display: "Unbounded", "Onest", system-ui, sans-serif;
  --body: "Onest", system-ui, -apple-system, "Segoe UI", sans-serif;
  --gutter: clamp(16px, 4vw, 40px);
  --max: 1120px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #12171c;
    --paper-2: #192027;
    --ink: #ece8df;
    --ink-2: #a3acb5;
    --rule: #2b343d;
    --accent: #93acff;
    --on-accent: #0d1530;
    --go: #4fc7bc;
    --limit: #e6b350;
    --stay: #f08068;
    --sky-clean: #173a55;
    --sky-smog: #4a3d27;
    --sky-ink: #eef2f6;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.5 var(--body);
}
h1, h2 { font-family: var(--display); font-weight: 600; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; margin: 0; text-transform: uppercase; letter-spacing: 0.04em; }
.sub { color: var(--ink-2); margin: 4px 0 16px; font-size: 0.95rem; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 8px; top: -60px; background: var(--ink); color: var(--paper); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.skip:focus { top: 8px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ---------- Top bar ---------- */
.bar {
  display: flex; align-items: center; gap: 12px;
  max-width: var(--max); margin: 0 auto; padding: 14px var(--gutter);
}
.wordmark {
  display: flex; align-items: center; gap: 8px; margin-right: auto;
  color: var(--ink); text-decoration: none;
  font: 700 1.35rem/1 var(--display); letter-spacing: -0.03em;
}
.wordmark svg { width: 30px; height: 30px; fill: none; stroke: var(--accent); stroke-width: 6; stroke-linecap: round; }
.place-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font: 600 0.95rem var(--body); color: var(--ink);
  background: transparent; border: 1px solid var(--rule); border-radius: 999px;
  padding: 8px 14px 8px 10px; min-height: 40px; cursor: pointer; max-width: 46vw;
}
.place-btn span:first-of-type { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.place-btn svg { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; }
.place-btn:hover { border-color: var(--ink); }
.lang { display: flex; border: 1px solid var(--rule); border-radius: 999px; padding: 3px; }
.lang button {
  font: 600 0.8rem var(--body); letter-spacing: 0.04em; color: var(--ink-2);
  background: none; border: 0; border-radius: 999px; padding: 6px 9px; min-height: 34px; cursor: pointer;
}
.lang button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

.place-panel {
  max-width: var(--max); margin: 0 auto 12px; padding: 16px var(--gutter);
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.place-panel label { display: block; font-weight: 600; margin-bottom: 6px; }
.field { display: flex; gap: 8px; }
.field input {
  flex: 1; min-width: 0; font: inherit; color: var(--ink);
  background: var(--paper-2); border: 1px solid var(--rule); border-radius: 12px; padding: 10px 14px; min-height: 48px;
}
.results { list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 4px; }
.results button {
  width: 100%; text-align: left; font: 500 1rem var(--body); color: var(--ink);
  background: none; border: 0; border-bottom: 1px solid var(--rule); padding: 12px 4px; cursor: pointer;
}
.results button:hover { color: var(--accent); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font: 600 1rem var(--body); text-decoration: none; cursor: pointer;
  border-radius: 14px; padding: 12px 18px; min-height: 50px; border: 1px solid transparent;
}
.btn svg { width: 20px; height: 20px; fill: currentColor; }
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-accent { background: var(--accent); color: var(--on-accent); }
.btn-accent:hover { filter: brightness(1.08); }
.btn-line { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-line:hover { background: var(--paper-2); }
.btn-warn { border-color: var(--stay); color: var(--stay); }
.btn-text {
  font: 600 0.95rem var(--body); color: var(--accent); background: none; border: 0; padding: 10px 0; cursor: pointer;
  text-decoration: underline; text-underline-offset: 4px;
}

/* ---------- Sky (hero) ---------- */
.sky {
  position: relative; isolation: isolate; overflow: hidden;
  max-width: var(--max); margin: 0 auto; border-radius: 0;
  color: var(--sky-ink);
  background:
    linear-gradient(180deg,
      color-mix(in oklab, var(--sky-clean), var(--sky-smog) calc(var(--haze) * 100%)) 0%,
      color-mix(in oklab, color-mix(in oklab, var(--sky-clean), var(--sky-smog) calc(var(--haze) * 100%)), var(--paper) 55%) 100%);
  transition: background 600ms ease;
}
@media (min-width: 760px) { .sky { border-radius: 28px; margin-top: 4px; } }
.sky::after {
  /* haze grain: stronger when the air is dirtier */
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  opacity: calc(var(--haze) * 0.55);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .45 0 0 0 0 .38 0 0 0 0 .25 0 0 0 .55 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  transition: opacity 600ms ease;
}
.sky-inner {
  display: grid; gap: 28px;
  padding: clamp(24px, 5vw, 56px) var(--gutter) 28px;
}
@media (min-width: 860px) {
  .sky-inner { grid-template-columns: 1fr 1.05fr; align-items: end; gap: 48px; }
}
.kicker { margin: 0; font-weight: 600; font-size: 0.95rem; opacity: 0.8; }
.kicker #hero-time { font-weight: 500; }
.aqi { margin: 4px 0 0; display: flex; align-items: flex-start; gap: 10px; }
#aqi-num {
  font: 700 clamp(104px, 30vw, 208px)/0.86 var(--display); letter-spacing: -0.06em;
  font-variant-numeric: tabular-nums;
}
.aqi-unit { font: 600 0.9rem var(--display); letter-spacing: 0.08em; margin-top: 0.6em; opacity: 0.75; }
.band { margin: 10px 0 0; font: 600 1.25rem/1.25 var(--display); }
.pm { margin: 6px 0 0; font-size: 0.92rem; opacity: 0.8; }

.who { border: 0; padding: 0; margin: 0 0 18px; min-width: 0; }
.who legend { font-size: 0.85rem; font-weight: 600; opacity: 0.8; margin-bottom: 8px; padding: 0; }
.seg {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px;
  background: color-mix(in oklab, var(--paper) 55%, transparent); border-radius: 16px; padding: 4px;
  backdrop-filter: blur(6px);
}
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.seg span {
  display: flex; align-items: center; justify-content: center; text-align: center;
  min-height: 52px; padding: 6px 8px; border-radius: 12px;
  font: 600 0.84rem/1.2 var(--body); color: var(--ink);
}
.seg input:checked + span { background: var(--ink); color: var(--paper); }
.seg input:focus-visible + span { outline: 3px solid var(--accent); outline-offset: 2px; }

.verdict {
  display: flex; align-items: center; gap: 14px;
  margin: 0; font-size: clamp(1.7rem, 5.5vw, 2.6rem); line-height: 1.08;
}
.mark { flex: none; width: 0.9em; height: 0.9em; display: grid; place-items: center; }
.mark svg { width: 100%; height: 100%; }
.reasons { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 6px; }
.reasons li { padding-left: 18px; position: relative; }
.reasons li::before { content: ""; position: absolute; left: 0; top: 0.62em; width: 8px; height: 2px; background: currentColor; opacity: 0.6; }
.status { margin: 0; padding: 0 var(--gutter) 18px; font-weight: 600; min-height: 1em; }
.status.error { color: var(--stay); }

.lv0 { --lv: var(--go); }
.lv1 { --lv: var(--limit); }
.lv2 { --lv: var(--stay); }

/* ---------- Blocks ---------- */
main { padding-bottom: 24px; }
.block { max-width: var(--max); margin: 0 auto; padding: 32px var(--gutter); border-bottom: 1px solid var(--rule); }
.block-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 24px; margin-bottom: 18px; }
.best { margin: 0; font-weight: 600; font-size: 1.05rem; }
.best b { font-family: var(--display); font-weight: 600; }

.split { max-width: var(--max); margin: 0 auto; display: grid; }
.split > .block { margin: 0; max-width: none; }
@media (min-width: 860px) {
  .split { grid-template-columns: 1fr 1fr; }
  .split > .block + .block { border-left: 1px solid var(--rule); }
}

/* Hours chart */
.hours-scroll { overflow-x: auto; margin: 0 calc(var(--gutter) * -1); padding: 0 var(--gutter) 6px; scrollbar-width: thin; }
.hours {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(24, minmax(30px, 1fr)); gap: 4px; min-width: 760px;
  align-items: end;
}
.hours li { display: grid; grid-template-rows: 150px 4px 2.4em; gap: 6px; text-align: center; }
.hours .col { position: relative; display: flex; align-items: flex-end; justify-content: center; }
.hours .bar-v {
  width: 100%; border-radius: 6px 6px 3px 3px; background: var(--lv);
  min-height: 10px; transition: height 400ms ease;
}
.hours .val { position: absolute; left: 0; right: 0; font: 600 0.72rem var(--body); color: var(--ink-2); }
.hours .t { font: 600 0.75rem var(--body); color: var(--ink-2); font-variant-numeric: tabular-nums; }
.hours .t small { display: block; font-weight: 500; opacity: 0.7; font-size: 0.66rem; }
.hours .sch { height: 4px; border-radius: 2px; background: transparent; }
.hours .is-school .sch { background: var(--accent); }
.hours .is-now .t { color: var(--ink); font-weight: 700; }
.hours .is-now .t small { color: var(--accent); opacity: 1; font-weight: 700; }
.hours .is-now .bar-v { outline: 2px solid var(--ink); outline-offset: 2px; }
.hours .is-best .t { color: var(--go); }

.legend { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 16px 0 0; padding: 0; font-size: 0.85rem; color: var(--ink-2); }
.legend li { display: flex; align-items: center; gap: 6px; }
.sw { width: 14px; height: 14px; border-radius: 4px; background: var(--lv); display: inline-block; }
.sw.school { height: 4px; width: 18px; background: var(--accent); border-radius: 2px; }

/* Advice */
.advice { list-style: none; counter-reset: a; margin: 16px 0 0; padding: 0; display: grid; gap: 0; }
.advice li {
  counter-increment: a; display: grid; grid-template-columns: 44px 1fr; gap: 12px;
  padding: 14px 0; border-top: 1px solid var(--rule); font-size: 1.02rem;
}
.advice li:first-child { border-top: 0; padding-top: 4px; }
.advice li::before { content: counter(a, decimal-leading-zero); font: 600 0.9rem/1.7 var(--display); color: var(--accent); }

/* Smog clock */
.clock { margin: 0; }
.clock svg { width: 100%; height: auto; display: block; overflow: visible; }
.clock .grid line { stroke: var(--rule); stroke-width: 1; }
.clock .grid text, .clock .axis text { fill: var(--ink-2); font: 500 11px var(--body); }
.clock .area { fill: color-mix(in oklab, var(--limit) 22%, transparent); }
.clock .line { fill: none; stroke: var(--ink); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.clock .school-band { fill: color-mix(in oklab, var(--accent) 12%, transparent); }
.clock .school-band-label { fill: var(--accent); font: 600 11px var(--body); }
.clock .now line { stroke: var(--accent); stroke-width: 1.5; stroke-dasharray: 3 4; }
.clock .now text { fill: var(--accent); font: 600 11px var(--body); }
.clock .dot-worst { fill: var(--stay); }
.clock .dot-best { fill: var(--go); }
.insight { margin: 14px 0 0; font: 600 1.1rem/1.35 var(--display); }
.insight-sub { margin: 8px 0 0; color: var(--ink-2); }

/* Share */
.share-grid { display: grid; gap: 20px; }
@media (min-width: 860px) { .share-grid { grid-template-columns: 1.1fr 1fr; align-items: start; } }
.preview {
  background: var(--paper-2); border-radius: 18px 18px 18px 4px; padding: 16px 18px;
  border: 1px solid var(--rule);
}
.digest { margin: 0; white-space: pre-wrap; font: 500 0.95rem/1.5 var(--body); }
.share-actions { display: grid; gap: 10px; align-content: start; }
.copied { margin: 0; color: var(--go); font-weight: 600; min-height: 1.4em; }

/* Settings & method */
.split-bottom .block { padding-top: 22px; padding-bottom: 22px; }
summary {
  cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between;
  font: 600 1.05rem var(--display); text-transform: uppercase; letter-spacing: 0.04em; min-height: 40px;
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font: 400 1.6rem/1 var(--body); color: var(--ink-2); }
details[open] summary::after { content: "–"; }
.settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
.settings-grid label { display: grid; gap: 6px; font-size: 0.9rem; color: var(--ink-2); }
.settings-grid input {
  font: 600 1.1rem var(--body); color: var(--ink); background: var(--paper-2);
  border: 1px solid var(--rule); border-radius: 12px; padding: 10px 12px; min-height: 48px; width: 100%;
}
.method-list { margin: 12px 0 0; padding-left: 1.2em; display: grid; gap: 10px; color: var(--ink-2); }

.foot { max-width: var(--max); margin: 0 auto; padding: 8px var(--gutter) 40px; color: var(--ink-2); font-size: 0.85rem; }

@media (max-width: 420px) {
  body { font-size: 16px; }
  .seg span { font-size: 0.78rem; min-height: 56px; }
  .lang button { padding: 6px 7px; }
  .bar { gap: 8px; }
  .wordmark { font-size: 1.15rem; gap: 6px; }
  .wordmark svg { width: 24px; height: 24px; }
  .place-btn { max-width: 34vw; padding: 6px 10px 6px 8px; }
}

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

/* ---------- Walk to school ---------- */
.walk {
  max-width: var(--max); margin: 14px auto 0; padding: 18px var(--gutter);
  display: grid; grid-template-columns: auto 1fr; gap: 16px; align-items: center;
  border-left: 6px solid var(--lv); background: var(--paper-2);
}
@media (min-width: 760px) {
  .walk { border-radius: 20px; grid-template-columns: auto 1fr auto; margin-left: auto; margin-right: auto; width: calc(100% - 2 * var(--gutter)); padding: 20px 28px; }
}
.walk-mark { width: 44px; height: 44px; display: grid; }
.walk h2 { margin: 0; text-transform: none; letter-spacing: -0.01em; font-size: 1.05rem; color: var(--ink-2); }
.walk-line { margin: 2px 0 0; font: 600 clamp(1.25rem, 4vw, 1.6rem)/1.2 var(--display); }
.walk-tip { margin: 6px 0 0; }
.walk-art { display: none; width: 120px; height: 60px; fill: none; stroke: var(--ink-2); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; opacity: 0.6; }
@media (min-width: 760px) { .walk-art { display: block; } }

/* ---------- Smoke reports ---------- */
.report-grid { display: grid; gap: 28px; }
@media (min-width: 860px) { .report-grid { grid-template-columns: 1.15fr 1fr; gap: 48px; } }
.report-form { display: grid; gap: 14px; align-content: start; }
.report-form .sub { margin: 0; }
.chips { border: 0; padding: 0; margin: 0; min-width: 0; }
.chips legend { font-weight: 600; margin-bottom: 8px; padding: 0; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip-row label { position: relative; }
.chip-row input { position: absolute; inset: 0; opacity: 0; margin: 0; cursor: pointer; }
.chip-row span {
  display: inline-flex; align-items: center; min-height: 44px; padding: 8px 14px;
  border: 1px solid var(--rule); border-radius: 999px; font-weight: 500; font-size: 0.95rem;
}
.chip-row input:checked + span { background: var(--stay); border-color: var(--stay); color: var(--paper); }
.chip-row input:focus-visible + span { outline: 3px solid var(--accent); outline-offset: 2px; }
.select-label { display: grid; gap: 6px; font-weight: 600; }
.select-label select {
  font: 500 1rem var(--body); color: var(--ink); background: var(--paper-2);
  border: 1px solid var(--rule); border-radius: 12px; padding: 10px 12px; min-height: 48px;
}
.report-form .btn { justify-self: start; }
.reports h3 { font: 600 0.95rem var(--display); text-transform: uppercase; letter-spacing: 0.04em; margin: 0 0 12px; }
.reports-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.rep-head { display: flex; justify-content: space-between; gap: 12px; }
.rep-head span { color: var(--ink-2); font-size: 0.9rem; }
.rep-bar { height: 10px; background: var(--paper-2); border-radius: 5px; margin-top: 6px; overflow: hidden; }
.rep-bar i { display: block; height: 100%; background: var(--stay); border-radius: 5px; }
.rep-types { margin: 4px 0 0; color: var(--ink-2); font-size: 0.85rem; }

.foot .btn { margin-bottom: 12px; }