/* Plaincards: deliberately boring, calm, and readable. No framework. */

:root {
  --bg: #f5f2ea;
  --panel: #fffdf8;
  --text: #1d1d1b;
  --muted: #69675f;
  --line: #cfcabf;
  --line-strong: #9f9a90;
  --accent: #2d4f70;
  --accent-soft: #e8eef4;
  --danger: #8c302d;
  --danger-soft: #f7e9e7;
  --success: #315c42;
  --success-soft: #e9f1eb;
  --warn: #725719;
  --warn-soft: #f6f0d8;
  --radius: 5px;
  --measure: 760px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171815;
    --panel: #20211d;
    --text: #f3f0e8;
    --muted: #b7b3a9;
    --line: #44453f;
    --line-strong: #6a6b64;
    --accent: #9fc1de;
    --accent-soft: #253543;
    --danger: #f0aaa3;
    --danger-soft: #3a2624;
    --success: #a8d6b6;
    --success-soft: #23342a;
    --warn: #e5c978;
    --warn-soft: #3a3422;
  }
}

* { box-sizing: border-box; }

html { font-size: 16px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

button, input, textarea, select {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: -60px;
  z-index: 50;
  padding: 8px 10px;
  color: var(--panel);
  background: var(--text);
  border: 1px solid var(--line-strong);
}

.skip-link:focus { top: 12px; }

.site-header {
  min-height: 58px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 20px;
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-name {
  display: flex;
  align-items: center;
  gap: 9px;
}

.brand {
  border: 0;
  padding: 0;
  background: transparent;
  font-weight: 750;
  font-size: 1.05rem;
  cursor: pointer;
}

.local-badge {
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--muted);
  font-size: .75rem;
  letter-spacing: .01em;
}

.top-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.text-button {
  border: 1px solid transparent;
  background: transparent;
  padding: 7px 9px;
  border-radius: var(--radius);
  cursor: pointer;
}

.text-button:hover { border-color: var(--line); background: var(--bg); }

main {
  width: min(100% - 28px, 1040px);
  margin: 0 auto;
  padding: 30px 0 70px;
}

.page-heading {
  max-width: var(--measure);
  margin-bottom: 24px;
}

.page-heading h1 {
  margin: 0 0 4px;
  font-size: clamp(1.65rem, 4vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: -.02em;
}

.page-heading p {
  color: var(--muted);
  margin: 0;
}

.toolbar {
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
  margin: 16px 0 22px;
}

.button {
  min-height: 42px;
  padding: 8px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  cursor: pointer;
  font-weight: 650;
}

.button:hover { background: var(--bg); }

.button.primary {
  background: var(--text);
  color: var(--panel);
  border-color: var(--text);
}

.button.primary:hover { opacity: .9; }

.button.danger {
  color: var(--danger);
  border-color: var(--danger);
  background: var(--panel);
}

.button.small {
  min-height: 34px;
  padding: 5px 9px;
  font-size: .9rem;
}

.deck-list {
  border-top: 1px solid var(--line);
}

.deck-row {
  width: 100%;
  text-align: left;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 17px 2px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
}

.deck-row:hover .deck-title { text-decoration: underline; }

.deck-title {
  display: block;
  font-weight: 760;
  font-size: 1.06rem;
  margin-bottom: 2px;
}

.deck-meta,
.muted {
  color: var(--muted);
  font-size: .92rem;
}

.count {
  color: var(--muted);
  white-space: nowrap;
}

.empty {
  max-width: 620px;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 24px;
  border-radius: var(--radius);
}

.empty h2 { margin: 0 0 8px; font-size: 1.15rem; }
.empty p { color: var(--muted); margin: 0 0 16px; }

.section {
  margin-top: 28px;
}

.section h2 {
  font-size: 1.05rem;
  margin: 0 0 10px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(115px, 1fr));
  border: 1px solid var(--line);
  border-right: 0;
  background: var(--panel);
}

.stat {
  padding: 12px;
  border-right: 1px solid var(--line);
}

.stat strong {
  display: block;
  font-size: 1.35rem;
  line-height: 1.2;
}

.stat span {
  color: var(--muted);
  font-size: .83rem;
}

.subset-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.subset-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.subset-count {
  min-width: 24px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0 5px;
  font-size: .83rem;
  color: var(--muted);
}

.card-table {
  border-top: 1px solid var(--line);
}

.card-preview {
  border-bottom: 1px solid var(--line);
  padding: 14px 2px;
}

.card-preview summary {
  cursor: pointer;
  font-weight: 650;
}

.card-preview .answer {
  margin: 10px 0 0;
  color: var(--muted);
  white-space: pre-wrap;
}

.form {
  max-width: 820px;
}

.field {
  margin-bottom: 18px;
}

.field label {
  display: block;
  font-weight: 680;
  margin-bottom: 6px;
}

.field input,
.field textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  padding: 10px 11px;
}

.field textarea {
  min-height: 110px;
  resize: vertical;
}

.help {
  margin-top: 5px;
  color: var(--muted);
  font-size: .86rem;
}

.editor-card {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 15px;
  margin-bottom: 12px;
  border-radius: var(--radius);
}

.editor-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.editor-card-head strong { font-size: .95rem; }

.study-shell {
  max-width: 860px;
  margin: 0 auto;
}

.study-top {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
  margin-bottom: 18px;
}

.study-title {
  margin: 0;
  font-size: 1rem;
}

.study-counter {
  color: var(--muted);
  font-size: .88rem;
}

.study-card {
  min-height: 370px;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  padding: clamp(24px, 6vw, 58px);
  text-align: center;
}

.study-content {
  width: min(100%, 700px);
}

.side-label {
  display: block;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: .74rem;
  font-weight: 800;
  margin-bottom: 18px;
}

.study-question,
.study-answer {
  font-size: clamp(1.35rem, 4vw, 2.2rem);
  line-height: 1.35;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.study-answer { font-size: clamp(1.2rem, 3.6vw, 1.9rem); }

.study-controls {
  margin-top: 15px;
}

.flip-button {
  width: 100%;
  min-height: 50px;
}

.rating-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
}

.rating {
  min-height: 54px;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 7px 6px;
  font-weight: 700;
}

.rating small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-weight: 500;
}

.rating:hover { background: var(--bg); }
.rating[data-rating="correct"] { border-color: var(--success); }
.rating[data-rating="wrong"] { border-color: var(--danger); }
.rating[data-rating="almost"] { border-color: var(--warn); }

.live-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin-top: 12px;
  color: var(--muted);
  font-size: .84rem;
}

.session-result {
  max-width: 760px;
}

.result-score {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 20px;
  margin: 18px 0;
}

.result-score strong {
  font-size: 2rem;
  display: block;
  line-height: 1.1;
}

.result-bars {
  border-top: 1px solid var(--line);
  margin-top: 18px;
}

.result-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) 44px;
  gap: 12px;
  align-items: center;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.bar-track {
  height: 10px;
  background: var(--bg);
  border: 1px solid var(--line);
}

.bar-fill {
  height: 100%;
  background: var(--line-strong);
}

.dialog-panel {
  max-width: 700px;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 20px;
}

.code-sample {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  border: 1px solid var(--line);
  background: var(--bg);
  padding: 12px;
  font: .88rem/1.45 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 8px 11px;
  font-size: .9rem;
  max-width: min(90vw, 540px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .12s linear;
  z-index: 60;
}

.toast.show { opacity: 1; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 24px 0;
}

kbd {
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  background: var(--panel);
  border-radius: 3px;
  padding: 0 4px;
  font-size: .78em;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    padding: 10px 14px;
  }

  .local-badge { display: none; }

  main {
    width: min(100% - 24px, 1040px);
    padding-top: 22px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    border-bottom: 0;
  }

  .stat { border-bottom: 1px solid var(--line); }

  .rating-grid {
    grid-template-columns: 1fr 1fr;
  }

  .rating:last-child {
    grid-column: 1 / -1;
  }

  .study-card {
    min-height: 300px;
    padding: 24px 18px;
  }

  .result-row {
    grid-template-columns: 105px minmax(0, 1fr) 38px;
  }
}

@media (max-width: 520px) {
  .site-header {
    position: static;
    display: block;
  }

  .top-actions {
    margin-top: 8px;
  }

  .top-actions .text-button:first-child {
    padding-left: 0;
  }

  .study-top {
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}