:root {
  --bg: #ffffff;
  --surface: #f5f7fa;
  --text: #111111;
  --muted: #30343b;
  --primary: #003f8c;
  --primary-contrast: #ffffff;
  --accent: #0a7c2f;
  --border: #1f2937;
  --warning: #7a1200;
  --focus: #ffbf47;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --radius: 0.5rem;
}

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

html {
  font-size: 18px;
}

body {
  margin: 0;
  font-family: "Verdana", "Arial", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--focus);
  color: #000;
  padding: var(--space-2);
  z-index: 999;
}

.skip-link:focus {
  left: var(--space-2);
}

header,
main,
footer {
  width: min(1100px, 100% - 2rem);
  margin-inline: auto;
}

header {
  padding: var(--space-3) 0;
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  padding: 0;
  margin: var(--space-2) 0 0 0;
}

nav a {
  display: inline-block;
  text-decoration: none;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  background: #fff;
}

.language-switch {
  margin-top: var(--space-2);
  display: flex;
  gap: var(--space-1);
}

.container {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

section {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

h1,
h2,
h3 {
  line-height: 1.3;
  margin-top: 0;
}

p,
li {
  max-width: 75ch;
}

.grid {
  display: grid;
  gap: var(--space-3);
}

@media (min-width: 48rem) {
  .grid.two {
    grid-template-columns: 1fr 1fr;
  }
}

button,
.button {
  min-height: 60px;
  min-width: 140px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  background: #fff;
  color: var(--text);
}

button.primary,
.button.primary {
  background: var(--primary);
  color: var(--primary-contrast);
}

button.success {
  background: var(--accent);
  color: #fff;
}

button.warning {
  background: var(--warning);
  color: #fff;
}

.tool-card {
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-2);
  background: #fff;
}

.ad-grid {
  display: grid;
  gap: var(--space-2);
}

@media (min-width: 60rem) {
  .ad-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.ad-placeholder {
  border: 2px dashed var(--border);
  background: #eef2f7;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2);
}

.clock-wrap {
  display: grid;
  gap: var(--space-2);
}

canvas#clockCanvas {
  width: min(100%, 700px);
  height: auto;
  background: #fff;
  border: 3px solid var(--border);
  border-radius: var(--radius);
  touch-action: none;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.sr-only {
  border: 0;
  clip: rect(0, 0, 0, 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}

.status-box {
  border-left: 8px solid var(--primary);
  background: #e8f0ff;
  padding: var(--space-2);
}

.result-box {
  border-left: 8px solid var(--accent);
  background: #eaf8ee;
  padding: var(--space-2);
}

.muted {
  color: var(--muted);
}

label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

input[type="text"],
textarea {
  width: 100%;
  min-height: 60px;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
}

select {
  width: 100%;
  min-height: 60px;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  background: #fff;
  margin-bottom: var(--space-2);
}

details {
  background: #fff;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-2);
}

details + details {
  margin-top: var(--space-2);
}

summary {
  cursor: pointer;
  font-weight: 700;
}

.test-grid {
  display: grid;
  gap: var(--space-2);
}

@media (min-width: 42rem) {
  .test-grid.cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .test-grid.cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.tile-btn {
  min-height: 72px;
  width: 100%;
  font-size: 1.1rem;
}

.hidden {
  display: none !important;
}

.related-links ul {
  margin: 0;
  padding-left: 1rem;
}

.target-zone {
  border: 3px solid var(--border);
  border-radius: var(--radius);
  min-height: 180px;
  display: grid;
  place-items: center;
  padding: var(--space-2);
  background: #fff;
}

.reaction-wait {
  background: #fef3c7;
}

.reaction-ready {
  background: #b7f7c8;
}

.trail-board {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.5rem;
}

.trail-node {
  min-height: 60px;
}

.plan-controls {
  display: grid;
  gap: var(--space-2);
}

@media (min-width: 48rem) {
  .plan-controls {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.plan-days {
  display: grid;
  gap: var(--space-2);
}

.plan-day {
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  padding: var(--space-2);
}

.plan-day h3 {
  margin-bottom: 0.5rem;
}

.helper-note {
  font-size: 0.95rem;
  color: var(--muted);
}

footer {
  padding: var(--space-4) 0;
  border-top: 2px solid var(--border);
}