:root {
  --page-bg: #0a0a0a;
  --bg: #f4f2ef;
  --surface: #ffffff;
  --text: #1a1a1a;
  --muted: #5c5c5c;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --success: #15803d;
  --right-answer-bg: #e8f5ea;
  --right-answer-border: #5cb87a;
  --wrong-bg: #fce8f0;
  --wrong-border: #e9a4bc;
  --key-bg: #e8e6e3;
  --key-active: #d4d1cc;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --equation-font: clamp(1.65rem, 7.5vw, 2.35rem);
  --equation-pad-y: 0.5rem;
  --equation-line: 1.15;
  --equation-border: 2px;
  --equation-inner-h: calc(var(--equation-line) * var(--equation-font));
  --equation-box-height: calc(
    var(--equation-pad-y) * 2 + var(--equation-inner-h) + var(--equation-border) * 2
  );
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: var(--font);
  font-size: 1.125rem;
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.92);
  background: var(--page-bg);
  padding: max(1rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) 0
    max(1rem, env(safe-area-inset-left));
}

.app {
  flex: 1 0 auto;
  max-width: 22rem;
  width: 100%;
  margin: 0 auto;
}

.app--menu {
  padding-top: 0.25rem;
}

.site-footer {
  flex-shrink: 0;
  padding: 1rem max(1rem, env(safe-area-inset-right)) max(1rem, env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-left));
  text-align: center;
}

.site-footer-logo {
  display: block;
  margin: 0 auto 0.65rem;
  width: min(9rem, 52vw);
  height: auto;
}

.site-footer p {
  margin: 0;
  font-size: 0.68rem;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.03em;
  color: rgba(255, 255, 255, 0.28);
}

.menu-title {
  margin: 0 0 0.35rem;
  font-family: "Luckiest Guy", cursive;
  font-size: clamp(2rem, 7vw, 2.85rem);
  font-weight: 400;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.menu-title-link {
  color: inherit;
  text-decoration: none;
}

.menu-title-link:hover {
  text-decoration: underline;
}

.menu-title-link:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 4px;
  border-radius: 6px;
}

.menu-lead {
  margin: 0 0 1.25rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.82);
  font-size: 1rem;
  font-weight: 500;
}

.menu-card {
  padding: 1.25rem;
}

.menu-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.menu-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.menu-group-title {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #000;
  text-align: center;
}

.menu-sublist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

a.btn,
a.btn-primary {
  text-decoration: none;
  text-align: center;
  color: #fff;
}

a.btn:active,
a.btn-primary:active {
  transform: scale(0.98);
}

.top {
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.nav-back {
  align-self: flex-start;
  font-size: 0.95rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  padding: 0.2rem 0;
  border-radius: 6px;
}

.nav-back:hover {
  color: #fff;
  text-decoration: underline;
}

.nav-back:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.streak {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.78);
  text-align: center;
}

.card {
  background: var(--surface);
  color: var(--text);
  border: 1px solid #000;
  border-radius: calc(var(--radius) + 4px);
  padding: 1.5rem 1.25rem 1.25rem;
  box-shadow: var(--shadow);
}

.card--table-pick {
  margin-bottom: 0.75rem;
  padding-bottom: 1.15rem;
}

.table-picker-label {
  margin: 0 0 0.75rem;
  font-size: clamp(1.1rem, 4vw, 1.35rem);
  font-weight: 800;
  text-align: center;
  letter-spacing: -0.02em;
}

.table-picker-grid {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 0.22rem;
  width: 100%;
}

.table-pick-btn {
  min-height: 2.2rem;
  padding: 0.18rem 0.06rem;
  font-family: inherit;
  font-size: clamp(0.68rem, 2.8vw, 0.98rem);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.08s ease, box-shadow 0.15s ease;
}

.problem-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.35rem 0.5rem;
  margin: 0 0 1.1rem;
  font-size: var(--equation-font);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
}

.problem-prefix {
  flex: 0 1 auto;
  text-align: center;
}

.answer-input {
  flex: 0 0 auto;
  width: 4.5ch;
  min-width: 3.5ch;
  max-width: 5.5ch;
  margin: 0;
  height: var(--equation-box-height);
  min-height: var(--equation-box-height);
  padding: var(--equation-pad-y) 0.4em;
  font: inherit;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  text-align: center;
  line-height: var(--equation-line);
  border: var(--equation-border) solid var(--key-bg);
  border-radius: calc(var(--radius) * 0.75);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.answer-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
}

.answer-input:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.answer-input.answer-input--wrong {
  background: var(--wrong-bg);
  border-color: var(--wrong-border);
}

.answer-input.answer-input--wrong:focus {
  border-color: var(--wrong-border);
  box-shadow: 0 0 0 3px rgba(233, 164, 188, 0.45);
}

.answer-input:disabled.answer-input--wrong {
  opacity: 1;
}

.solution-reveal {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 0 0.75rem;
  height: var(--equation-box-height);
  min-height: var(--equation-box-height);
  padding: var(--equation-pad-y) 0.85rem;
  text-align: center;
  font-size: var(--equation-font);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  line-height: var(--equation-line);
  color: var(--text);
  background: var(--right-answer-bg);
  border: var(--equation-border) solid var(--right-answer-border);
  border-radius: calc(var(--radius) * 0.75);
}

.solution-reveal.hidden {
  display: none;
}

.actions.hidden {
  display: none;
}

.feedback {
  min-height: 1.5rem;
  margin: 0 0 1rem;
  text-align: center;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--muted);
}

.feedback.feedback--right {
  color: var(--success);
}

.actions {
  margin-bottom: 1rem;
}

.btn {
  display: block;
  width: 100%;
  padding: 0.95rem 1.25rem;
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.08s ease, box-shadow 0.15s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary,
.key {
  background: #111;
  color: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.22), 0 1px 3px rgba(0, 0, 0, 0.14);
}

.btn-primary:hover,
.key:hover {
  background: #1f1f1f;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.28), 0 2px 5px rgba(0, 0, 0, 0.18);
}

.btn-primary:active,
.key:active {
  background: #0a0a0a;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  transform: scale(0.98);
}

.btn-primary:focus-visible,
.key:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 3px #111, 0 4px 16px rgba(0, 0, 0, 0.28);
}

/* Tabellval: vald knapp — högre specificitet än .key / .key:hover ovan */
.key.table-pick-btn.is-selected {
  background: var(--success);
  color: #fff;
  box-shadow: 0 2px 10px rgba(21, 128, 61, 0.35), 0 1px 3px rgba(0, 0, 0, 0.14);
}

.key.table-pick-btn.is-selected:hover {
  background: #136f2d;
  box-shadow: 0 4px 14px rgba(19, 111, 45, 0.45), 0 2px 5px rgba(0, 0, 0, 0.18);
}

.key.table-pick-btn.is-selected:active {
  background: #0f5c26;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  transform: scale(0.98);
}

.key.table-pick-btn.is-selected:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 3px var(--success), 0 2px 10px rgba(21, 128, 61, 0.35);
}

.numpad.hidden {
  display: none;
}

.numpad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

/* Inte .table-pick-btn — annars skriver den över kompakt tabellrad (kommer efter .table-pick-btn i källan). */
.key:not(.table-pick-btn) {
  min-height: 3.25rem;
  padding: 0.65rem;
  font-family: inherit;
  font-size: 1.35rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.08s ease, box-shadow 0.15s ease;
}

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

.app--tioko {
  max-width: 24rem;
}

.tioko-card {
  padding: 1.25rem 1rem 1.25rem;
}

.tioko-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.35rem, 5vw, 1.75rem);
  font-weight: 800;
  text-align: center;
  letter-spacing: -0.02em;
}

.tioko-instr {
  margin: 0 0 1rem;
  text-align: center;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--muted);
  line-height: 1.4;
  min-height: 2.8rem;
}

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

.pair-key {
  min-height: 3.1rem;
  aspect-ratio: 1;
  padding: 0.4rem;
  font-size: 1.25rem;
}

.pair-key--hundra {
  font-size: 1.05rem;
  padding: 0.35rem 0.25rem;
}

.pair-key--selected {
  background: #1f1f1f !important;
  box-shadow: 0 0 0 3px var(--accent), 0 4px 16px rgba(0, 0, 0, 0.28) !important;
}

.pair-key--paired-green {
  background: var(--right-answer-bg) !important;
  color: var(--text) !important;
  border: 2px solid var(--right-answer-border) !important;
  box-shadow: none !important;
  cursor: default;
  opacity: 1;
}

.pair-key--paired-green:hover {
  background: var(--right-answer-bg) !important;
  box-shadow: none !important;
}

.pair-key--paired-gray {
  --pair-empty-fill: var(--bg);
  background: var(--pair-empty-fill) !important;
  color: var(--pair-empty-fill) !important;
  border: 2px solid var(--pair-empty-fill) !important;
  box-shadow: none !important;
  cursor: default;
  opacity: 1;
}

.pair-key--paired-gray:hover {
  background: var(--pair-empty-fill) !important;
  color: var(--pair-empty-fill) !important;
  border-color: var(--pair-empty-fill) !important;
  box-shadow: none !important;
}

.pair-key--wrong {
  background: var(--wrong-bg) !important;
  color: var(--text) !important;
  border: 2px solid var(--wrong-border) !important;
  box-shadow: none !important;
}

@media (min-width: 480px) {
  .app {
    max-width: 24rem;
  }

  .app--tioko {
    max-width: 26rem;
  }

  .key:not(.table-pick-btn) {
    min-height: 3.5rem;
    font-size: 1.4rem;
  }

  .pair-key {
    min-height: 3.35rem;
    font-size: 1.35rem;
  }

  .pair-key--hundra {
    font-size: 1.15rem;
  }
}

.is-hidden {
  display: none !important;
}

.app--admin {
  max-width: 66rem;
}

.admin-card {
  padding: 1.1rem;
  margin-bottom: 1rem;
}

.admin-card-back {
  display: inline-block;
  margin: 0 0 0.6rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
}

.admin-card-back:hover {
  color: var(--text);
  text-decoration: underline;
}

.admin-card-back:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.admin-title {
  margin: 0 0 0.4rem;
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  font-weight: 800;
  text-align: center;
}

.admin-brand {
  font-family: "Luckiest Guy", cursive;
  font-size: clamp(2rem, 7vw, 2.85rem);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.admin-subtitle {
  margin: 0 0 1rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}

.admin-subtitle--tight {
  margin: 0 0 0.6rem;
  font-size: 0.88rem;
}

.admin-form {
  display: grid;
  gap: 0.75rem;
}

.admin-tool-list {
  display: grid;
  gap: 0.65rem;
}

.admin-multi {
  margin-top: 1rem;
  border-top: 1px solid #e6e2de;
  padding-top: 0.9rem;
}

.admin-multi-title {
  margin: 0 0 0.6rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
}

.admin-option-list {
  display: grid;
  gap: 0.45rem;
}

.admin-option-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
  color: var(--text);
}

.admin-option-checkbox {
  width: 1rem;
  height: 1rem;
}

.admin-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.admin-label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.92rem;
  color: var(--text);
}

.admin-input {
  width: 100%;
  border: 2px solid var(--key-bg);
  border-radius: 10px;
  padding: 0.55rem 0.65rem;
  font: inherit;
  color: var(--text);
  background: var(--bg);
}

.admin-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.22);
}

.admin-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.admin-message {
  margin: 0.3rem 0 0;
  min-height: 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.admin-message--error {
  color: #b42318;
}

.admin-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 0.9rem;
}

.admin-mini-btn {
  width: auto;
  padding: 0.6rem 0.9rem;
  font-size: 0.95rem;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(72px, 1fr));
  gap: 0.6rem;
}

.numcard {
  display: block;
  width: 100%;
  position: relative;
  border: none;
  border-radius: 10px;
  padding: 0;
  aspect-ratio: 1;
  min-height: 4.1rem;
  background: transparent;
  cursor: pointer;
  perspective: 900px;
}

.numcard-inner {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.45s ease;
}

.numcard.is-revealed .numcard-inner {
  transform: rotateY(180deg);
}

.numcard-face {
  position: absolute;
  inset: 0;
  border-radius: 10px;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  font-variant-numeric: tabular-nums;
}

.numcard-front {
  background: #111;
  color: #fff;
  border: 2px solid #111;
}

.numcard-back {
  transform: rotateY(180deg);
  background: #e8f5ea;
  border: 2px solid #5cb87a;
  color: var(--text);
}

.numcard-back--special {
  background: #fff4db;
  border-color: #c98511;
  color: #4a2f00;
  font-size: clamp(0.92rem, 2vw, 1.05rem);
}

.numcard.is-retired {
  cursor: default;
}

.numcard.is-retired .numcard-back {
  background: #c8c6c3;
  border-color: #9c9894;
  color: rgba(0, 0, 0, 0.74);
}

@media (min-width: 760px) {
  .admin-grid {
    grid-template-columns: repeat(10, minmax(78px, 1fr));
  }

  .numcard {
    min-height: 5rem;
  }
}