/* ==========================================================================
   SkillForge — mobile-first, dark by default.
   Buttons are deliberately flat: solid fills and restrained shadows, no
   gradients. Depth comes from surface layering and borders instead.
   ========================================================================== */

/* ----------------------------------------------------------------- tokens */
:root {
  --bg: #0a0e17;
  --surface: rgba(20, 26, 40, 0.72);
  --surface-solid: #141a28;
  --surface-hi: rgba(31, 40, 61, 0.85);
  --border: rgba(255, 255, 255, 0.09);
  --border-hi: rgba(255, 255, 255, 0.16);
  --text: #e9eefb;
  --text-dim: #97a3bd;
  --text-faint: #6b7692;
  --accent: #5b8cff;
  --accent-hover: #4a7ef5;
  --accent-ink: #ffffff;
  --accent-soft: rgba(91, 140, 255, 0.14);
  --success: #34d399;
  --success-dim: rgba(52, 211, 153, 0.16);
  --danger: #fb7185;
  --danger-dim: rgba(251, 113, 133, 0.16);
  --warn: #f0a742;
  --track: rgba(255, 255, 255, 0.08);
  --chart-line: #5b8cff;
  --chart-muted: #6b7692;
  --shadow: 0 12px 30px -18px rgba(0, 0, 0, 0.9);
  --shadow-sm: 0 2px 6px -2px rgba(0, 0, 0, 0.55);
  --radius: 20px;
  --radius-sm: 12px;
  --radius-pill: 999px;
  --gap: 16px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --speed: 240ms;
}

[data-theme='light'] {
  --bg: #eef1f8;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-solid: #ffffff;
  --surface-hi: #f6f8fc;
  --border: rgba(16, 22, 38, 0.10);
  --border-hi: rgba(16, 22, 38, 0.20);
  --text: #101626;
  --text-dim: #55617c;
  --text-faint: #7b86a1;
  --accent: #3b6fe0;
  --accent-hover: #2f5fc9;
  --accent-soft: rgba(59, 111, 224, 0.12);
  --success: #0f9c6c;
  --success-dim: rgba(15, 156, 108, 0.14);
  --danger: #d8385a;
  --danger-dim: rgba(216, 56, 90, 0.12);
  --warn: #b8730d;
  --track: rgba(16, 22, 38, 0.10);
  --chart-line: #3b6fe0;
  --chart-muted: #9aa4bb;
  --shadow: 0 12px 28px -20px rgba(16, 22, 38, 0.45);
  --shadow-sm: 0 2px 6px -3px rgba(16, 22, 38, 0.3);
}

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

/* Components below set explicit display values, which would otherwise win
   over the user-agent rule for [hidden]. */
[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

h1, h2, h3, p { margin: 0; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
img { max-width: 100%; display: block; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

/* ------------------------------------------------------------------ shell */
.app { min-height: 100%; display: flex; flex-direction: column; }

.appbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 8px;
  /* Keep the bar's contents aligned with the centred content column below. */
  padding-block: 10px;
  padding-inline: max(14px, env(safe-area-inset-left), calc((100% - 760px) / 2 + 14px))
                  max(14px, env(safe-area-inset-right), calc((100% - 760px) / 2 + 14px));
  min-height: 56px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid transparent;
  transition: border-color var(--speed) var(--ease);
}

.appbar.is-scrolled { border-bottom-color: var(--border); }

.appbar__title {
  flex: 1;
  min-width: 0;
  font-size: 1.0625rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.appbar__brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  padding: 0;
}

.appbar__mark {
  width: 26px; height: 26px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
}

.appbar__mark svg { width: 15px; height: 15px; }

.iconbtn {
  width: 40px; height: 40px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  color: var(--text-dim);
  transition: background var(--speed) var(--ease), color var(--speed) var(--ease),
    transform 120ms var(--ease);
}

.iconbtn:hover { background: var(--surface-hi); color: var(--text); }
.iconbtn:active { transform: scale(0.92); }
.iconbtn svg { width: 21px; height: 21px; }

main {
  flex: 1;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 12px max(14px, env(safe-area-inset-left)) 48px
           max(14px, env(safe-area-inset-right));
}

/* ------------------------------------------------------------------ views */
.view { display: none; }
.view.is-active { display: block; animation: view-in 300ms var(--ease) both; }

@keyframes view-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}

.stack { display: flex; flex-direction: column; gap: var(--gap); }

.page__title {
  font-size: clamp(1.5rem, 6vw, 1.875rem);
  font-weight: 720;
  letter-spacing: -0.03em;
}

.section-title {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 4px 4px 0;
}

.lede { color: var(--text-dim); font-size: 0.9375rem; }

/* ------------------------------------------------------------------ cards */
.card {
  background: var(--surface);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.card--tap {
  display: block;
  width: 100%;
  text-align: left;
  transition: transform 160ms var(--ease), border-color var(--speed) var(--ease),
    background var(--speed) var(--ease);
}

.card--tap:hover { border-color: var(--border-hi); background: var(--surface-hi); }
.card--tap:active { transform: scale(0.985); }

.card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.card__title { font-size: 1rem; font-weight: 650; letter-spacing: -0.01em; }
.card__hint { color: var(--text-dim); font-size: 0.875rem; }
.card__chevron { width: 19px; height: 19px; color: var(--text-faint); flex: none; }

.stagger > * { animation: rise 360ms var(--ease) both; }
.stagger > *:nth-child(1) { animation-delay: 20ms; }
.stagger > *:nth-child(2) { animation-delay: 60ms; }
.stagger > *:nth-child(3) { animation-delay: 100ms; }
.stagger > *:nth-child(4) { animation-delay: 140ms; }
.stagger > *:nth-child(5) { animation-delay: 180ms; }
.stagger > *:nth-child(n + 6) { animation-delay: 220ms; }

@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}

/* ------------------------------------------------------------- skill cards */
.skillcard { --skill-accent: var(--accent); }

.skillcard__top { display: flex; align-items: center; gap: 14px; }

.skillcard__icon {
  width: 46px; height: 46px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: color-mix(in srgb, var(--skill-accent) 16%, transparent);
  color: var(--skill-accent);
  border: 1px solid color-mix(in srgb, var(--skill-accent) 30%, transparent);
}

.skillcard__icon svg { width: 23px; height: 23px; }
.skillcard__text { flex: 1; min-width: 0; }

.skillcard__title {
  font-size: 1.0625rem;
  font-weight: 660;
  letter-spacing: -0.015em;
}

.skillcard__tagline {
  font-size: 0.875rem;
  color: var(--text-dim);
  margin-top: 2px;
}

.skillcard__chevron { width: 20px; height: 20px; color: var(--text-faint); flex: none; }

.skillcard__summary {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.skillcard__stat { font-variant-numeric: tabular-nums; }

/* ---------------------------------------------------------------- landing */
.landing { align-items: center; text-align: center; padding-top: 8vh; }

.landing__mark {
  width: 64px; height: 64px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.landing__mark svg { width: 34px; height: 34px; }

.landing__title {
  font-size: clamp(1.875rem, 8vw, 2.375rem);
  font-weight: 740;
  letter-spacing: -0.04em;
}

.landing__tagline { color: var(--text-dim); max-width: 34ch; }

.landing .card { width: 100%; text-align: left; }

.landing__button {
  display: flex;
  justify-content: center;
  margin-top: 20px;
  min-height: 44px;
}

/* --------------------------------------------------------- progress bars */
.progress {
  display: flex;
  height: 10px;
  border-radius: var(--radius-pill);
  background: var(--track);
  overflow: hidden;
}

.progress--slim { height: 6px; }

.progress__seg {
  height: 100%;
  width: 0;
  transition: width 700ms var(--ease);
}

.progress__seg--correct { background: var(--success); }
.progress__seg--wrong { background: var(--danger); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-top: 12px;
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.legend__item { display: flex; align-items: center; gap: 7px; }

.legend__dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--track);
  flex: none;
}

.legend__dot--correct { background: var(--success); }
.legend__dot--wrong { background: var(--danger); }
.legend__value { color: var(--text); font-variant-numeric: tabular-nums; font-weight: 600; }

.headline { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }

.headline__value {
  font-size: clamp(2.25rem, 11vw, 3rem);
  font-weight: 720;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.headline__unit { font-size: 1.125rem; font-weight: 600; color: var(--text-dim); }
.headline__sub { color: var(--text-dim); font-size: 0.875rem; }

/* --------------------------------------------------------------- buttons */
/* Flat by design: solid fills, one-step hover, no gradients. */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 50px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 620;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  transition: transform 140ms var(--ease), background var(--speed) var(--ease),
    border-color var(--speed) var(--ease), color var(--speed) var(--ease),
    opacity var(--speed) var(--ease);
}

.btn:active { transform: scale(0.975); }
.btn[disabled] { opacity: 0.45; pointer-events: none; }
.btn--block { width: 100%; }

.btn--primary {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover { background: var(--accent-hover); }

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

.btn--ghost:hover { border-color: var(--border-hi); background: var(--surface-hi); }

.btn--quiet { color: var(--text-dim); min-height: 44px; }
.btn--quiet:hover { color: var(--text); }

.btn--danger { background: var(--danger-dim); color: var(--danger); }
.btn--danger:hover { background: color-mix(in srgb, var(--danger) 26%, transparent); }

.btn__icon { width: 19px; height: 19px; flex: none; }

.btn-row { display: flex; flex-direction: column; gap: 10px; }

@media (min-width: 480px) {
  .btn-row { flex-direction: row; }
  .btn-row > .btn { flex: 1; }
}

/* ------------------------------------------------------- segmented chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.875rem;
  font-weight: 560;
  transition: background var(--speed) var(--ease), color var(--speed) var(--ease),
    border-color var(--speed) var(--ease), transform 140ms var(--ease);
}

.chip:hover:not([disabled]) { color: var(--text); border-color: var(--border-hi); }
.chip:active:not([disabled]) { transform: scale(0.96); }

.chip.is-selected {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  color: var(--text);
}

.chip[disabled] { opacity: 0.4; cursor: not-allowed; }

.chip__input {
  width: 74px;
  padding: 9px 12px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.875rem;
  text-align: center;
  -moz-appearance: textfield;
}

.chip__input--year { width: 88px; }

.chip__input::-webkit-outer-spin-button,
.chip__input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.field { display: flex; flex-direction: column; gap: 10px; }
.field__label { font-size: 0.875rem; font-weight: 600; }
.field__hint { font-size: 0.8125rem; color: var(--text-faint); }

/* --------------------------------------------------------------- toggles */
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.row:last-child { border-bottom: none; }
.row--stack { align-items: flex-start; flex-direction: column; gap: 10px; }
.row__text { min-width: 0; }
.row__title { font-size: 0.9375rem; font-weight: 570; }
.row__hint { font-size: 0.8125rem; color: var(--text-faint); margin-top: 3px; }

.switch { position: relative; flex: none; width: 50px; height: 30px; }
.switch input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }

.switch__track {
  display: block;
  width: 100%; height: 100%;
  border-radius: var(--radius-pill);
  background: var(--track);
  border: 1px solid var(--border);
  transition: background var(--speed) var(--ease), border-color var(--speed) var(--ease);
  pointer-events: none;
}

.switch__track::after {
  content: '';
  position: absolute;
  top: 4px; left: 4px;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: transform var(--speed) var(--ease), background var(--speed) var(--ease);
}

.switch input:checked + .switch__track {
  background: var(--accent);
  border-color: transparent;
}

.switch input:checked + .switch__track::after {
  transform: translateX(20px);
  background: #fff;
}

.switch input:focus-visible + .switch__track {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.checkbox { display: flex; align-items: flex-start; gap: 11px; cursor: pointer; }
.checkbox input { width: 20px; height: 20px; margin: 2px 0 0; accent-color: var(--accent); flex: none; }
.checkbox__text { font-size: 0.9375rem; }

.yearpair { display: flex; gap: 12px; flex-wrap: wrap; }
.yearfield { display: flex; align-items: center; gap: 8px; }
.yearfield__label { font-size: 0.8125rem; color: var(--text-faint); }

/* ----------------------------------------------------------------- flags  */
.flag {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hi);
  background: var(--track);
  box-shadow: var(--shadow-sm);
}

.flag--sm { width: 46px; border-radius: 6px; flex: none; }

.grid-continents { display: grid; grid-template-columns: 1fr; gap: 12px; }

@media (min-width: 560px) {
  .grid-continents { grid-template-columns: repeat(2, 1fr); }
}

.continent__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.continent__name { font-weight: 640; letter-spacing: -0.01em; }
.continent__count { font-size: 0.8125rem; color: var(--text-dim); font-variant-numeric: tabular-nums; }

/* -------------------------------------------------------------- exercises */
.quizbar { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }

.quizbar__count {
  font-size: 0.875rem;
  font-weight: 620;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  flex: none;
}

.quizbar .progress { flex: 1; }

.quizbar__timer {
  margin-left: auto;
  font-size: 1rem;
  font-weight: 680;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  min-width: 5.5ch;
  text-align: right;
}

.badge {
  font-size: 0.6875rem;
  font-weight: 680;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 9px;
  border-radius: var(--radius-pill);
  flex: none;
}

.badge--practice {
  background: color-mix(in srgb, var(--warn) 18%, transparent);
  color: var(--warn);
}

.question { text-align: center; }
.question__prompt { font-size: 0.9375rem; color: var(--text-dim); margin-bottom: 14px; }
.question__stage { animation: swap-in 260ms var(--ease) both; }

@keyframes swap-in {
  from { opacity: 0; transform: translateY(8px) scale(0.99); }
  to   { opacity: 1; transform: none; }
}

.question__flag {
  width: min(100%, 340px);
  margin: 0 auto 20px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 16px;
  border: 1px solid var(--border-hi);
  box-shadow: var(--shadow);
  background: var(--track);
}

.question__name {
  font-size: clamp(1.5rem, 7vw, 2.125rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 8px auto 22px;
  max-width: 18ch;
  line-height: 1.15;
}

.options { display: grid; grid-template-columns: 1fr; gap: 10px; }
.options--flags { grid-template-columns: repeat(2, 1fr); }

@media (min-width: 520px) {
  .options { grid-template-columns: repeat(2, 1fr); }
}

.option {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  min-height: 56px;
  text-align: left;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 560;
  transition: transform 140ms var(--ease), background var(--speed) var(--ease),
    border-color var(--speed) var(--ease);
}

.option:hover:not(:disabled) { border-color: var(--border-hi); background: var(--surface-hi); }
.option:active:not(:disabled) { transform: scale(0.98); }

.option--flag { flex-direction: column; gap: 0; padding: 8px; min-height: 0; }
.option--flag .flag { border-radius: 9px; }

.option__key {
  flex: none;
  width: 24px; height: 24px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: var(--track);
  font-size: 0.75rem;
  font-weight: 650;
  color: var(--text-faint);
}

.option.is-correct, .daybtn.is-correct {
  border-color: var(--success);
  background: var(--success-dim);
  color: var(--text);
}

.option.is-wrong, .daybtn.is-wrong {
  border-color: var(--danger);
  background: var(--danger-dim);
  color: var(--text);
  animation: shake 420ms var(--ease);
}

.option.is-dim, .daybtn.is-dim { opacity: 0.4; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(2px); }
}

.answerbox { display: flex; flex-direction: column; gap: 12px; }

.textinput {
  width: 100%;
  padding: 15px 17px;
  min-height: 54px;
  border-radius: var(--radius-sm);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1rem;
  transition: border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.textinput::placeholder { color: var(--text-faint); }

.textinput:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.textinput.is-correct { border-color: var(--success); box-shadow: 0 0 0 4px var(--success-dim); }
.textinput.is-wrong { border-color: var(--danger); box-shadow: 0 0 0 4px var(--danger-dim); animation: shake 420ms var(--ease); }

.feedback {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 15px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 570;
  text-align: left;
  animation: swap-in 240ms var(--ease) both;
}

.feedback--good { background: var(--success-dim); color: var(--success); }
.feedback--bad { background: var(--danger-dim); color: var(--danger); }
.feedback__answer { color: var(--text); font-weight: 620; }
.feedback svg { width: 20px; height: 20px; flex: none; }

/* ------------------------------------------------------------- doomsday  */
.dd-date {
  font-size: clamp(1.5rem, 7vw, 2.25rem);
  font-weight: 720;
  letter-spacing: -0.03em;
  margin: 6px auto 24px;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}

.daygrid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

@media (min-width: 520px) {
  .daygrid { grid-template-columns: repeat(4, 1fr); }
}

.daybtn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: 62px;
  padding: 10px 8px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  transition: transform 140ms var(--ease), background var(--speed) var(--ease),
    border-color var(--speed) var(--ease);
}

.daybtn:hover:not(:disabled) { border-color: var(--border-hi); background: var(--surface-hi); }
.daybtn:active:not(:disabled) { transform: scale(0.97); }

.daybtn__short { font-size: 1.0625rem; font-weight: 680; letter-spacing: -0.01em; }
.daybtn__long { font-size: 0.75rem; color: var(--text-faint); }

/* Sunday sits alone on the last row at 4-up; let it span for balance. */
@media (min-width: 520px) {
  .daygrid > .daybtn:last-child { grid-column: span 1; }
}

.practice {
  margin-top: 20px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.practice__label { font-size: 0.8125rem; font-weight: 600; color: var(--text-dim); }

.reference {
  margin-top: 4px;
  padding: 13px 15px;
  border-radius: var(--radius-sm);
  background: var(--track);
  border: 1px solid var(--border);
}

.reference__title {
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 9px;
}

.reference__grid { display: flex; flex-direction: column; gap: 6px; }

.reference__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.875rem;
}

.reference__label { color: var(--text-dim); }
.reference__value { font-weight: 640; font-variant-numeric: tabular-nums; }

/* ------------------------------------------------ phonetic / morse trainers */
.pair-prompt {
  font-size: clamp(2.5rem, 16vw, 4rem);
  font-weight: 740;
  letter-spacing: -0.04em;
  line-height: 1;
  margin: 10px auto 26px;
  font-variant-numeric: tabular-nums;
}

.pair-prompt--value { margin: 18px auto 30px; justify-content: center; }
.pair-prompt--value.morse { transform: scale(1.5); transform-origin: center; }

/* Dots and dashes drawn as shapes: far easier to read than punctuation. */
.morse {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 14px;
}

.morse__el {
  display: block;
  height: 7px;
  border-radius: var(--radius-pill);
  background: currentColor;
}

.morse__el--dit { width: 7px; }
.morse__el--dah { width: 21px; }

.option .morse { color: var(--text); }

.pairchart {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px 18px;
}

@media (min-width: 560px) {
  .pairchart { grid-template-columns: repeat(3, 1fr); }
}

.pairchart__row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 2px;
  border-bottom: 1px solid var(--border);
  min-width: 0;
}

.pairchart__key {
  flex: none;
  width: 26px;
  font-weight: 700;
  font-size: 0.9375rem;
  font-variant-numeric: tabular-nums;
}

.pairchart__value {
  flex: 1;
  min-width: 0;
  font-size: 0.875rem;
  color: var(--text-dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pairchart .morse { flex: 1; color: var(--text-dim); }

.pairchart__dot {
  flex: none;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--track);
}

.pairchart__dot--correct { background: var(--success); }
.pairchart__dot--wrong { background: var(--danger); }

.chart-toggle { width: 100%; text-align: left; padding: 0; }
.chart-toggle .card__chevron { transition: transform var(--speed) var(--ease); }

.playbtn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 8px auto 28px;
  padding: 18px 28px;
  border-radius: var(--radius-pill);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  color: var(--accent);
  font-size: 1rem;
  font-weight: 640;
  transition: transform 140ms var(--ease), background var(--speed) var(--ease);
}

.playbtn:hover { background: color-mix(in srgb, var(--accent) 22%, transparent); }
.playbtn:active { transform: scale(0.96); }
.playbtn svg { width: 24px; height: 24px; }

.statgrid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

@media (min-width: 520px) {
  .statgrid { grid-template-columns: repeat(4, 1fr); }
}

.stattile {
  padding: 13px 14px;
  border-radius: var(--radius-sm);
  background: var(--track);
  text-align: center;
}

.stattile__value {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.stattile__label {
  font-size: 0.75rem;
  color: var(--text-faint);
  margin-top: 2px;
}

.chart-holder { width: 100%; }

.chart { width: 100%; height: 200px; display: block; overflow: visible; }
.chart__grid { stroke: var(--border); stroke-width: 1; vector-effect: non-scaling-stroke; }
.chart__line { vector-effect: non-scaling-stroke; }

.chart__ylabel, .chart__xlabel {
  fill: var(--text-faint);
  font-size: 11px;
  font-family: inherit;
}

.chart-key--real { background: var(--chart-line); }
.chart-key--practice { background: var(--chart-muted); opacity: 0.6; }

.attempt__mark {
  width: 28px; height: 28px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 50%;
}

.attempt__mark svg { width: 15px; height: 15px; }
.attempt__mark--ok { background: var(--success-dim); color: var(--success); }
.attempt__mark--bad { background: var(--danger-dim); color: var(--danger); }

.mistake__tag--time {
  background: var(--track);
  color: var(--text-dim);
}

.notice--practice {
  background: color-mix(in srgb, var(--warn) 14%, transparent);
  color: var(--warn);
}

/* ------------------------------------------------------------- results */
.score { text-align: center; padding: 26px 18px 22px; }

.score__value {
  font-size: clamp(2.5rem, 15vw, 3.75rem);
  font-weight: 740;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  animation: pop 460ms var(--ease) both;
}

@keyframes pop {
  0%   { opacity: 0; transform: scale(0.88); }
  60%  { transform: scale(1.02); }
  100% { opacity: 1; transform: scale(1); }
}

.score__label {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-top: 6px;
}

.score__split {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 20px;
  font-size: 0.8125rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}

.score__split b {
  display: block;
  font-size: 1.25rem;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.score__split .good b { color: var(--success); }
.score__split .bad b { color: var(--danger); }

.mistake-list { display: flex; flex-direction: column; gap: 2px; }

.mistake {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.mistake:last-child { border-bottom: none; }
.mistake__body { min-width: 0; flex: 1; }
.mistake__name { font-weight: 570; font-size: 0.9375rem; }

.mistake__meta {
  font-size: 0.8125rem;
  color: var(--text-faint);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mistake__tag {
  flex: none;
  font-size: 0.75rem;
  font-weight: 620;
  padding: 4px 9px;
  border-radius: var(--radius-pill);
  background: var(--danger-dim);
  color: var(--danger);
  font-variant-numeric: tabular-nums;
}

.mistake__tag--ok { background: var(--success-dim); color: var(--success); }

.empty { text-align: center; padding: 30px 18px; color: var(--text-faint); font-size: 0.9375rem; }
.empty__mark { font-size: 1.875rem; margin-bottom: 10px; }

/* --------------------------------------------------------- toast + modal */
.toasts {
  position: fixed;
  left: 50%;
  bottom: calc(18px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: min(430px, calc(100vw - 28px));
  pointer-events: none;
}

.toast {
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  background: var(--surface-solid);
  border: 1px solid var(--border-hi);
  box-shadow: var(--shadow);
  font-size: 0.875rem;
  animation: toast-in 280ms var(--ease) both;
}

.toast.is-leaving { animation: toast-out 220ms var(--ease) both; }
.toast--good { border-color: color-mix(in srgb, var(--success) 45%, transparent); }
.toast--bad { border-color: color-mix(in srgb, var(--danger) 45%, transparent); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(16px) scale(0.97); }
  to   { opacity: 1; transform: none; }
}

@keyframes toast-out { to { opacity: 0; transform: translateY(10px) scale(0.98); } }

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: end center;
  padding: 16px;
  background: rgba(4, 7, 14, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fade-in 200ms var(--ease) both;
}

@media (min-width: 560px) { .modal-backdrop { place-items: center; } }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

.modal {
  width: min(420px, 100%);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  animation: modal-in 300ms var(--ease) both;
  margin-bottom: env(safe-area-inset-bottom);
}

@keyframes modal-in {
  from { opacity: 0; transform: translateY(24px) scale(0.97); }
  to   { opacity: 1; transform: none; }
}

.modal__title { font-size: 1.0625rem; font-weight: 680; letter-spacing: -0.01em; }
.modal__body { color: var(--text-dim); font-size: 0.9375rem; margin: 9px 0 20px; }

.notice {
  padding: 13px 15px;
  border-radius: var(--radius-sm);
  background: var(--track);
  color: var(--text-dim);
  font-size: 0.875rem;
}

.account { display: flex; align-items: center; gap: 13px; }

.account__avatar {
  width: 44px; height: 44px;
  flex: none;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1.0625rem;
}

.account__name { font-weight: 620; }
.account__meta { font-size: 0.8125rem; color: var(--text-faint); }

/* ------------------------------------------------------------- a11y prefs */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}