/* RST Flash — exchange-drill tokens */
:root {
  --bg: #0f1419;
  --surface: #1a222c;
  --border: #2d3a47;
  --text: #e8eef4;
  --muted: #8b9aab;
  --accent: #3d9cf0;
  --accent-press: #2a7fc4;
  --ok: #3ecf8e;
  --bad: #f07178;
  --focus: #ffd166;
  --radius: 10px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
}

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

html {
  color-scheme: dark;
}

body {
  margin: 0;

  /* max-width moved to content via gota-island-chrome.css */
  padding: 0 0 2.5rem;


  font-family: var(--font);
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--focus);
  color: #111;
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.island-hero {
  margin-bottom: 1rem;
}

.eyebrow {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.island-hero h1 {
  margin: 0.2rem 0;
  font-size: 1.75rem;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.facts {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.92rem;
}

.facts p {
  margin: 0;
}

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

.mode-tabs {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.mode-tabs button {
  flex: 1;
  font: inherit;
  font-weight: 600;
  padding: 0.65rem 0.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.mode-tabs button[aria-selected="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.mode-tabs button:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.mode-choice {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.75rem 1rem;
  margin: 0 0 1rem;
}

.mode-choice legend {
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0 0.25rem;
}

label {
  font-weight: 600;
  font-size: 0.95rem;
}

label.check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  cursor: pointer;
  margin-top: 0.35rem;
}

input[type="text"] {
  font: inherit;
  font-family: var(--mono);
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  width: 100%;
}

#flash-input {
  font-size: 1.25rem;
  letter-spacing: 0.05em;
}

.primary,
.secondary,
.ghost,
.chip {
  font: inherit;
  font-weight: 600;
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
}

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

.primary:hover,
.primary:active {
  background: var(--accent-press);
}

.secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
}

.hint {
  margin: 0.4rem 0 0.8rem;
  font-size: 0.88rem;
  color: var(--muted);
}

kbd {
  font-family: var(--mono);
  font-size: 0.85em;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface);
}

.prompt-label {
  margin: 0 0 0.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.zone-prompt {
  margin: 0 0 1rem;
  font-size: clamp(2.5rem, 12vw, 3.5rem);
  font-weight: 700;
  font-family: var(--mono);
  letter-spacing: 0.08em;
}

#flash-form {
  display: grid;
  gap: 0.5rem;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.feedback {
  min-height: 1.5em;
  margin: 0.85rem 0 0.35rem;
  font-weight: 600;
}

.feedback.ok {
  color: var(--ok);
}

.feedback.bad {
  color: var(--bad);
}

.score {
  margin: 0;
  color: var(--muted);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.chip {
  font-family: var(--mono);
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
  min-width: 3.5rem;
}

.chip[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.exchange-display {
  margin-top: 0.5rem;
  padding: 1.25rem;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.exchange-display .digits {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(2rem, 10vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.exchange-display .phonetic {
  margin: 0.6rem 0 0;
  font-size: 1.15rem;
  color: var(--muted);
}

.site-footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
}

.site-footer a {
  color: var(--accent);
}

.site-footer p {
  margin: 0 0 0.6rem;
}

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