/* Shared stylesheet for all vision test pages. */
:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #5b6877;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --warn-bg: #fef3c7;
  --warn-border: #f59e0b;
  --ok: #16a34a;
  --bad: #dc2626;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.1), 0 1px 2px rgba(16, 24, 40, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

header.site {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}
header.site h1 { margin: 0; font-size: 1.6rem; }
header.site a { color: var(--accent); text-decoration: none; font-weight: 600; }
header.site a:hover { text-decoration: underline; }

p.lead { color: var(--muted); margin-top: 0; }

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.card h2 { margin: 0; font-size: 1.15rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; flex: 1; }
.card .units { font-size: 0.8rem; color: var(--accent-dark); font-weight: 600; }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}
.btn:hover { background: var(--accent-dark); }
.btn.secondary {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn.secondary:hover { background: rgba(37, 99, 235, 0.08); }
.btn.big { font-size: 1.3rem; padding: 14px 26px; }
.btn:disabled { opacity: 0.5; cursor: default; }

/* Answer button groups (arrows, digits) */
.answer-grid {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 16px 0;
}
.answer-grid .btn { min-width: 64px; }

/* Status / banners */
.banner {
  border-radius: var(--radius);
  padding: 12px 16px;
  margin: 12px 0;
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
}
.banner.ok { background: #dcfce7; border-color: var(--ok); }
.banner a { color: var(--accent-dark); font-weight: 600; }

.calib-status {
  font-size: 0.9rem;
  color: var(--muted);
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 10px 16px;
  margin: 12px 0;
}
.calib-status strong { color: var(--text); }

/* Test stage area */
.stage {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin: 16px 0;
  text-align: center;
}
.stage canvas { max-width: 100%; }

.progress { color: var(--muted); font-size: 0.9rem; margin-bottom: 8px; }

/* Results */
.results-table {
  border-collapse: collapse;
  margin: 12px auto;
}
.results-table td, .results-table th {
  padding: 8px 18px;
  border-bottom: 1px solid #e5e7eb;
  text-align: center;
}
.results-table th { color: var(--muted); font-weight: 600; font-size: 0.85rem; text-transform: uppercase; }
.result-big { font-size: 2.2rem; font-weight: 700; margin: 8px 0; }
.result-ok { color: var(--ok); }
.result-bad { color: var(--bad); }

/* Disclaimer */
.disclaimer {
  margin-top: 32px;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: #eef2f7;
  color: var(--muted);
  font-size: 0.85rem;
  border-left: 4px solid var(--warn-border);
}

/* Forms */
label { font-weight: 600; }
input[type="number"], input[type="text"], select {
  font-size: 1rem;
  padding: 8px 10px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  width: 110px;
}
input[type="range"] { width: 100%; max-width: 480px; }

fieldset {
  border: 1px solid #e5e7eb;
  border-radius: var(--radius);
  margin: 12px 0;
  padding: 12px 16px;
}
fieldset legend { font-weight: 600; padding: 0 6px; }

.checklist { list-style: none; padding: 0; margin: 0; text-align: left; }
.checklist li { margin: 10px 0; }
.checklist label { font-weight: 400; }