:root {
  color-scheme: light;
  --bg: #f7faf6;
  --surface: #fdfdfb;
  --card: #ffffff;
  --text: #172018;
  --muted: #657064;
  --line: #e3e9e1;
  --primary: #2f8f46;
  --primary-dark: #1f6f34;
  --primary-soft: #dff4e4;
  --danger: #d63f3f;
  --danger-soft: #ffe7e7;
  --warning: #a76610;
  --shadow: 0 18px 55px rgba(23, 32, 24, 0.08);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100%;
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(47, 143, 70, 0.14), transparent 34rem),
    var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
input {
  font: inherit;
  -webkit-tap-highlight-color: transparent;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.64;
}

.app-shell {
  display: flex;
  min-height: 100dvh;
  max-width: 500px;
  margin: 0 auto;
  flex-direction: column;
  background: rgba(253, 253, 251, 0.92);
  box-shadow: 0 0 0 1px rgba(23, 32, 24, 0.04);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  min-height: 82px;
  grid-template-columns: 44px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: calc(14px + env(safe-area-inset-top)) 18px 12px;
  background: rgba(253, 253, 251, 0.86);
  border-bottom: 1px solid rgba(227, 233, 225, 0.72);
  backdrop-filter: blur(18px);
}

.app-header h1 {
  margin: 2px 0 0;
  font-size: 1.15rem;
  line-height: 1.2;
  letter-spacing: 0;
}

.app-header:has(.icon-button.is-hidden) {
  grid-template-columns: 1fr auto;
}

.eyebrow {
  margin: 0;
  color: var(--primary-dark);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

main {
  flex: 1;
}

.screen {
  display: none;
  min-height: calc(100dvh - 134px);
  padding: 18px;
  animation: screenIn 180ms ease-out;
}

.screen.is-active {
  display: block;
}

@keyframes screenIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero {
  padding: 28px 4px 22px;
}

.hero h2,
.screen-intro h2,
.result-card h2 {
  margin: 8px 0 10px;
  font-size: clamp(2rem, 8vw, 2.7rem);
  line-height: 1.03;
  letter-spacing: 0;
}

.hero p,
.screen-intro p,
.result-card p {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.55;
}

.stats-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--primary-soft);
}

.stats-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

.stats-card strong {
  font-size: 1rem;
}

.category-list {
  display: grid;
  gap: 12px;
}

.category-card {
  width: 100%;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
  color: inherit;
  text-align: left;
}

.category-card:not(:disabled):active {
  transform: translateY(1px) scale(0.995);
}

.category-card:disabled {
  cursor: not-allowed;
  opacity: 0.68;
  box-shadow: none;
}

.category-card h3 {
  margin: 0 0 6px;
  font-size: 1.15rem;
}

.category-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.category-card .pill {
  display: inline-flex;
  margin-top: 14px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 0.78rem;
  font-weight: 750;
}

.category-card:disabled .pill {
  background: #eef0ed;
  color: var(--muted);
}

.screen-intro {
  padding: 8px 4px 18px;
}

.word-list {
  display: grid;
  gap: 10px;
  padding-bottom: 96px;
}

.word-card {
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
}

.word-card strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.08rem;
}

.word-card span {
  display: block;
  color: var(--muted);
  line-height: 1.42;
}

.word-card em {
  color: var(--text);
  font-style: normal;
  font-weight: 700;
}

.bottom-action {
  position: sticky;
  bottom: 0;
  margin: 0 -18px -18px;
  padding: 26px 18px calc(18px + env(safe-area-inset-bottom));
  background: linear-gradient(transparent, var(--surface) 26%);
}

.progress-wrap {
  padding: 4px 0 18px;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.progress-track {
  overflow: hidden;
  height: 10px;
  border-radius: 999px;
  background: #e9eee7;
}

.progress-bar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), #6fba55);
  transition: width 220ms ease;
}

.flashcard {
  display: grid;
  min-height: 230px;
  align-content: center;
  margin: 10px 0 18px;
  padding: 30px 22px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--card);
  box-shadow: var(--shadow);
  text-align: center;
}

.flashcard h2 {
  margin: 12px 0 8px;
  font-size: clamp(2.35rem, 12vw, 4rem);
  line-height: 1;
  letter-spacing: 0;
}

.flashcard p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.setup-form,
.answer-form {
  display: grid;
  gap: 12px;
}

.setup-form {
  margin-bottom: 28px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
}

.setup-form label,
.answer-form label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.setup-form input,
.answer-form input {
  width: 100%;
  min-height: 58px;
  padding: 0 16px;
  border: 2px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  color: var(--text);
  outline: none;
  font-size: 1.08rem;
  transition: border-color 150ms ease, background-color 150ms ease, box-shadow 150ms ease;
}

.setup-form input:focus,
.answer-form input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(47, 143, 70, 0.14);
}

.answer-form input.is-correct {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.answer-form input.is-wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.setup-form input.is-shaking,
.answer-form input.is-shaking {
  animation: shake 260ms ease-in-out;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-6px);
  }

  75% {
    transform: translateX(6px);
  }
}

.feedback {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.45;
}

.feedback.is-correct {
  color: var(--primary-dark);
  font-weight: 750;
}

.feedback.is-wrong {
  color: var(--danger);
  font-weight: 750;
}

.primary-button,
.secondary-button,
.text-button,
.icon-button,
.why-button,
.close-button {
  min-height: 50px;
  border: 0;
  border-radius: 16px;
  font-weight: 800;
}

.primary-button {
  width: 100%;
  background: var(--primary);
  color: white;
  box-shadow: 0 10px 24px rgba(47, 143, 70, 0.24);
}

.primary-button:active {
  transform: translateY(1px);
}

.secondary-button {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
}

.text-button {
  width: 100%;
  background: transparent;
  color: var(--primary-dark);
}

.icon-button {
  display: grid;
  width: 44px;
  min-height: 44px;
  place-items: center;
  background: #eef4ed;
  color: var(--primary-dark);
  font-size: 2rem;
  line-height: 1;
}

.why-button {
  min-height: 40px;
  padding: 0 13px;
  border: 1px solid var(--line);
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 0.88rem;
}

.close-button {
  display: grid;
  width: 42px;
  min-height: 42px;
  flex: 0 0 auto;
  place-items: center;
  background: #eef4ed;
  color: var(--primary-dark);
  font-size: 1.4rem;
  line-height: 1;
}

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

.result-card {
  margin-top: 40px;
  padding: 30px 22px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--card);
  box-shadow: var(--shadow);
  text-align: center;
}

.result-card strong {
  display: block;
  margin: 18px 0 12px;
  color: var(--primary-dark);
  font-size: clamp(3rem, 15vw, 4.8rem);
  line-height: 1;
}

.action-stack {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.notes-dialog {
  width: min(464px, calc(100vw - 28px));
  max-height: min(78dvh, 660px);
  margin: auto auto 14px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 22px 70px rgba(23, 32, 24, 0.22);
}

.notes-dialog::backdrop {
  background: rgba(23, 32, 24, 0.28);
  backdrop-filter: blur(4px);
}

.dialog-header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(253, 253, 251, 0.94);
}

.dialog-header h2 {
  margin: 4px 0 0;
  font-size: 1.35rem;
  line-height: 1.15;
}

.notes-list {
  display: grid;
  gap: 12px;
  padding: 14px 18px 18px;
}

.note-card {
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
}

.note-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.note-card p {
  margin: 0 0 10px;
  color: var(--muted);
  line-height: 1.5;
}

.note-card p:last-child {
  margin-bottom: 0;
}

.note-card code {
  padding: 2px 6px;
  border-radius: 8px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.9em;
  white-space: normal;
}

.note-card a {
  color: var(--primary-dark);
  font-size: 0.92rem;
  font-weight: 750;
}

.share-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  justify-content: center;
  padding: 14px 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
}

.category-list + .share-actions {
  margin-top: 16px;
}

.home-share-actions {
  border: 0;
  background: transparent;
  padding: 10px 0 2px;
}

.share-label {
  width: 100%;
  margin: 0 0 2px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
  text-align: center;
}

.share-option {
  display: grid;
  width: 48px;
  min-height: 48px;
  place-items: center;
  border: 0;
  border-radius: 14px;
  background: transparent;
}

.share-option img {
  display: block;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  object-fit: cover;
}

.share-option:active {
  transform: translateY(1px);
}

.share-actions .feedback {
  width: 100%;
  min-height: 20px;
  text-align: center;
}

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

.learned-section {
  padding-bottom: 96px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.section-heading h3 {
  margin: 4px 0 0;
  font-size: 1.2rem;
}

.section-heading span {
  display: inline-grid;
  min-width: 38px;
  min-height: 34px;
  place-items: center;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 800;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
}

.learned-table {
  width: 100%;
  min-width: 430px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.learned-table th,
.learned-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.learned-table th {
  color: var(--primary-dark);
  font-size: 0.82rem;
  letter-spacing: 0;
  text-transform: none;
}

.learned-table tr:last-child td {
  border-bottom: 0;
}

.learned-table td {
  color: var(--muted);
}

.app-footer {
  padding: 12px 18px calc(14px + env(safe-area-inset-bottom));
  color: var(--muted);
  text-align: center;
}

@media (min-width: 720px) {
  body {
    padding: 24px 0;
  }

  .app-shell {
    overflow: hidden;
    min-height: calc(100dvh - 48px);
    border-radius: 32px;
  }
}