/* styles.css — VisionCheckR
   Clean, accessible, responsive styling. No external fonts or assets. */

:root {
  color-scheme: light;
  --bg: #f4f6f7;
  --panel: #ffffff;
  --panel-2: #eef2f5;
  --ink: #121a21;
  --ink-dim: #4b5967;
  --accent: #0b6e8a;
  --accent-ink: #ffffff;
  --good: #1d7f4a;
  --warn: #8a5a00;
  --bad: #b42323;
  --line: #d4dce3;
  --radius: 14px;
  --shadow: 0 4px 18px rgba(18, 26, 33, 0.08);
  --maxw: 860px;
}

* { box-sizing: border-box; }

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

a { color: var(--accent); }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.25rem 1.1rem 4rem;
}

header.app-header {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.8rem;
  margin-bottom: 1rem;
}
header.app-header h1 { font-size: 1.5rem; margin: 0; }
header.app-header .tag { color: var(--ink-dim); font-size: 0.95rem; }

/* Disclaimer banners — deliberately prominent and repeated. */
.disclaimer {
  background: #fff6dc;
  border: 1px solid #e7c873;
  color: #5a3e00;
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  margin: 0 0 1.1rem;
  font-size: 0.95rem;
}
.disclaimer strong { color: #3d2a00; }
.disclaimer.mini {
  font-size: 0.85rem;
  padding: 0.55rem 0.8rem;
  margin-top: 1.2rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.15rem;
  margin-bottom: 1.1rem;
}
.panel h2 { margin: 0 0 0.5rem; font-size: 1.2rem; }
.panel h3 { margin: 0.6rem 0 0.3rem; font-size: 1.02rem; }
.panel p { color: var(--ink-dim); }
.panel .lead { color: var(--ink); }

/* Progress / stepper */
.steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
  list-style: none;
  padding: 0;
}
.steps li {
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink-dim);
  background: var(--panel-2);
}
.steps li[aria-current="step"] {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}
.steps li.done { color: var(--good); border-color: #9fd3b6; }

/* Buttons & controls */
button, .btn {
  font: inherit;
  cursor: pointer;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  padding: 0.55rem 0.95rem;
  transition: transform 0.05s ease, background 0.15s ease, border-color 0.15s ease;
}
button:hover, .btn:hover { border-color: var(--accent); }
button:active { transform: translateY(1px); }
button.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  font-weight: 650;
}
button.ghost { background: transparent; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button:focus-visible, a:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.row { display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center; }
.row.end { justify-content: flex-end; }
.spacer { flex: 1 1 auto; }

.field { margin: 0.7rem 0; }
.field label { display: block; font-weight: 600; margin-bottom: 0.25rem; }
.field .hint { color: var(--ink-dim); font-size: 0.85rem; }
input[type="text"], input[type="number"] {
  font: inherit;
  background: var(--panel-2);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.5rem 0.6rem;
  width: 100%;
  max-width: 260px;
}
input[type="range"] { width: 100%; max-width: 420px; }

.canvas-frame {
  display: flex;
  justify-content: center;
  padding: 0.8rem;
  background: #0b1119;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin: 0.7rem 0;
}
canvas { max-width: 100%; height: auto; image-rendering: auto; }

/* Calibration card */
#calCard {
  height: 54px;
  background: linear-gradient(135deg, #2b6cb0, #4cc2ff);
  border-radius: 8px;
  border: 2px solid #cfeaff;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.25);
  position: relative;
}
#calCard::after {
  content: "Match a real card's width";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #06283b;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

/* Snellen line rows */
.snellen-line {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.35rem 0.5rem;
  border-radius: 8px;
}
/* Face, weight and size are set inline by app.js, which measures the face's
   cap height so each letter is drawn at the height its line claims. */
.snellen-line .letters {
  letter-spacing: 0.12em;
  color: #121a21;
  line-height: 1;
  white-space: nowrap;
}
.snellen-line.selected { background: #dbeef3; outline: 2px solid var(--accent); }
/* A line this screen cannot draw at its true size: shown, but not selectable. */
.snellen-line.unavailable { opacity: 0.45; cursor: not-allowed; }
.snellen-line .pick { margin-left: auto; }

/* Contrast answer pad */
.dpad {
  display: grid;
  grid-template-columns: repeat(3, 64px);
  grid-template-rows: repeat(3, 64px);
  gap: 0.4rem;
  justify-content: center;
  margin: 0.6rem 0;
}
.dpad button { width: 64px; height: 64px; font-size: 1.4rem; }
.dpad .up { grid-column: 2; grid-row: 1; }
.dpad .left { grid-column: 1; grid-row: 2; }
.dpad .right { grid-column: 3; grid-row: 2; }
.dpad .down { grid-column: 2; grid-row: 3; }

/* Astigmatism axis toggles */
.axis-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.6rem 0;
}
.axis-grid button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  font-weight: 700;
}

/* Run-reliability panel on the summary */
.reliability {
  border: 1px solid var(--line);
  border-left-width: 4px;
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  margin: 0.6rem 0;
  background: var(--panel-2);
}
.reliability.reliable { border-left-color: var(--good); }
.reliability.partial { border-left-color: var(--warn); }
.reliability.unreliable { border-left-color: var(--bad); }
.reliability p { margin: 0.35rem 0; }
.reliability .reliability-verdict { color: var(--ink); font-weight: 600; }
.reliability-issues {
  margin: 0.25rem 0 0.2rem;
  padding-left: 1.2rem;
  color: var(--ink-dim);
  font-size: 0.9rem;
}

/* Saved sessions and comparison */
.saved-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  margin: 0.5rem 0;
  background: var(--panel-2);
}
.comparison {
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  margin: 0.7rem 0;
}
.comparison-changes { margin: 0.3rem 0; padding-left: 1.2rem; }
.change-better { color: var(--good); }
.change-worse { color: var(--warn); }
.change-same { color: var(--ink-dim); }

/* Results */
.result-line {
  border-left: 3px solid var(--line);
  padding: 0.4rem 0.75rem;
  margin: 0.5rem 0;
}
.result-line.flag { border-left-color: var(--warn); }
.badge {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink-dim);
}
.badge.good { color: var(--good); border-color: #9fd3b6; }
.badge.flag { color: var(--warn); border-color: #e3c27a; }
.headline { font-size: 1.15rem; font-weight: 700; margin: 0.3rem 0; }

.progress-mini { color: var(--ink-dim); font-size: 0.85rem; }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap;
}

footer.app-footer {
  color: var(--ink-dim);
  font-size: 0.82rem;
  border-top: 1px solid var(--line);
  margin-top: 1.5rem;
  padding-top: 0.9rem;
}

@media (max-width: 560px) {
  header.app-header h1 { font-size: 1.25rem; }
  .dpad { grid-template-columns: repeat(3, 56px); grid-template-rows: repeat(3, 56px); }
  .dpad button { width: 56px; height: 56px; }
}

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