:root {
  --bg: #f6f4ef;
  --paper: #fffdf8;
  --ink: #1a2332;
  --muted: #5c6678;
  --accent: #2a5f8f;
  --accent-soft: #e8f1f8;
  --ok: #2d7a4f;
  --ok-soft: #e6f4ec;
  --bad: #a33b3b;
  --border: #d8dde6;
  --radius: 12px;
  --font: "Source Sans 3", system-ui, sans-serif;
  --serif: "Literata", Georgia, serif;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
}

.top {
  padding: 1rem 1.25rem 0.5rem;
  max-width: 52rem;
  margin: 0 auto;
}

.top__back {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.top__back:hover {
  text-decoration: underline;
}

.top__meta {
  margin: 0.35rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: 52rem;
  margin: 0 auto;
  padding: 0 1.25rem 1rem;
  border-bottom: 1px solid var(--border);
}

.tabs__link {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--muted);
  background: transparent;
}

.tabs__link:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.tabs__link--active {
  color: var(--paper);
  background: var(--accent);
}

.panel {
  max-width: 52rem;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 2.5rem;
}

.panel__kicker {
  margin: 0 0 0.35rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.panel h1 {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin: 0 0 0.75rem;
}

.panel__lead {
  margin: 0 0 1.5rem;
  color: var(--muted);
  max-width: 42rem;
}

.stage {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.stage[hidden] {
  display: none !important;
}

.stage__title {
  font-family: var(--serif);
  font-size: 1.25rem;
  margin: 0 0 0.75rem;
}

.stage__text {
  margin: 0 0 1.25rem;
  color: var(--muted);
}

.progress {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.progress__bar {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.progress__fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.25s ease;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--paper);
  color: var(--ink);
  border-radius: 10px;
  padding: 0.65rem 1.1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--paper);
}

.btn--primary:hover:not(:disabled) {
  filter: brightness(1.06);
  background: var(--accent);
}

.btn--choice {
  min-width: 9rem;
  text-align: center;
}

.btn--squeeze {
  border-color: #6b8cae;
}

.btn--release {
  border-color: #8cae6b;
}

.btn--squeeze.is-selected,
.btn--squeeze:hover:not(:disabled) {
  background: #e8f0f8;
  border-color: #4a7aa8;
}

.btn--release.is-selected,
.btn--release:hover:not(:disabled) {
  background: #edf4e8;
  border-color: #5a8a4a;
}

.training-card {
  display: grid;
  gap: 1rem;
  margin: 1rem 0;
}

.gesture-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
}

.gesture-label__icon {
  display: inline-flex;
  width: 2rem;
  height: 2rem;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 1.1rem;
}

.gesture-label--squeeze .gesture-label__icon {
  background: #dce8f4;
  color: #2a5f8f;
}

.gesture-label--release .gesture-label__icon {
  background: #e4f0dc;
  color: #3d6b32;
}

.gesture-hint {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}

.variant-tag {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
}

.feedback {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.95rem;
}

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

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

.results {
  text-align: center;
  padding: 1rem 0;
}

.results__percent {
  font-family: var(--serif);
  font-size: clamp(2.5rem, 10vw, 4rem);
  font-weight: 600;
  color: var(--accent);
  margin: 0.5rem 0 1rem;
}

.results__stats {
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.results__save {
  margin: -0.75rem 0 1.25rem;
  font-size: 0.92rem;
  color: var(--muted);
}

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

.results__save--pending {
  color: #8a6b12;
}

.foot {
  max-width: 52rem;
  margin: 0 auto;
  padding: 1rem 1.25rem 2rem;
  text-align: center;
  font-size: 0.88rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.foot a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.foot a:hover {
  text-decoration: underline;
}

.foot span {
  margin: 0 0.4rem;
  opacity: 0.5;
}

@media (max-width: 480px) {
  .btn--choice {
    flex: 1 1 100%;
  }
}