/* Encore — a desk with index cards: red header line, blue rules, highlighter on the target word. */

:root {
  --desk: #e2e7ee;
  --paper: #ffffff;
  --rule: #cddcf0;
  --margin: #e0675c;
  --ink: #17203b;
  --ink-soft: #586281;
  --ink-faint: #8a93ad;
  --line-strong: #b8c2d3;
  --accent: #2646c4;
  --accent-ink: #ffffff;
  --accent-wash: #e4e9fb;
  --hl: #ffe45e;
  --again: #c23a31;
  --hard: #9a610f;
  --good: #23784a;
  --easy: #2646c4;
  --shadow: 0 1px 0 rgba(23, 32, 59, 0.06), 0 22px 34px -22px rgba(23, 32, 59, 0.5);

  --serif: 'Gentium Book Plus', 'Charis SIL', Georgia, serif;
  --sans: 'Golos Text', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --line: 2.4rem;
  --card-pad: 40px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --desk: #10152a;
    --paper: #1a2137;
    --rule: #28334f;
    --margin: #b9564d;
    --ink: #e3e7f2;
    --ink-soft: #a2abc4;
    --ink-faint: #6f7997;
    --line-strong: #36425f;
    --accent: #8fa5ff;
    --accent-ink: #10152a;
    --accent-wash: #232c4a;
    --hl: rgba(255, 220, 80, 0.3);
    --again: #f08a80;
    --hard: #e2b264;
    --good: #6cc795;
    --easy: #8fa5ff;
    --shadow: 0 22px 36px -20px rgba(0, 0, 0, 0.75);
    color-scheme: dark;
  }
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--desk);
  color: var(--ink);
  font: 400 16px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}

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

button { cursor: pointer; }

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

/* ---------- top bar ---------- */

.topbar {
  max-width: 960px;
  margin: 0 auto;
  padding: 18px 20px 8px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  font: 700 1.55rem/1 var(--serif);
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav {
  display: flex;
  gap: 22px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav a {
  position: relative;
  padding: 6px 0;
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
  font-weight: 500;
}

.nav a:hover { color: var(--ink); }

.nav a.active { color: var(--ink); }

.nav a.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--margin);
}

.badge {
  margin-left: 6px;
  color: var(--accent);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.badge:empty { display: none; }

.level-pill {
  font: 700 1.05rem/1 var(--serif);
  color: var(--ink);
  text-decoration: none;
  padding: 7px 12px 6px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--paper);
}

body.onboarding .nav,
body.onboarding .level-pill,
body.signed-out .nav,
body.signed-out .level-pill { visibility: hidden; }

/* ---------- layout ---------- */

.main {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 20px 80px;
}

.lead {
  margin: 8px 0 0;
  color: var(--ink-soft);
  max-width: 60ch;
}

.page-title {
  font: 700 2rem/1.2 var(--serif);
  margin: 18px 0 8px;
}

/* ---------- index card ---------- */

.deck {
  position: relative;
  margin: 26px 0 22px;
}

.deck.stacked::before {
  content: '';
  position: absolute;
  inset: 8px 4px -7px 8px;
  background: var(--paper);
  border-radius: 5px;
  box-shadow: var(--shadow);
  transform: rotate(1.3deg);
  opacity: 0.7;
}

.card {
  position: relative;
  background: var(--paper);
  border-radius: 5px;
  box-shadow: var(--shadow);
  padding: 0 var(--card-pad) 30px;
  min-height: 300px;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.card.fly-left { transform: translateX(-36px) rotate(-2deg); opacity: 0; }
.card.fly-right { transform: translateX(36px) rotate(2deg); opacity: 0; }
.card.leaving { transform: translateY(-14px); opacity: 0; }

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  min-height: 64px;
  padding: 20px 0 10px;
  border-bottom: 2px solid var(--margin);
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
  font-size: 0.9rem;
}

.card-kind { font-weight: 600; }

.card-task { color: var(--ink-soft); }

.card-tools {
  display: flex;
  align-items: center;
  gap: 10px;
}

.cefr {
  font: 700 0.95rem/1 var(--serif);
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 4px 6px 3px;
}

/* Blue rules run edge to edge; text sits on them because line-height equals the rule pitch. */
.ruled {
  margin: 0 calc(var(--card-pad) * -1);
  padding: 0 var(--card-pad) var(--line);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent calc(var(--line) - 1px),
    var(--rule) calc(var(--line) - 1px),
    var(--rule) var(--line)
  );
  background-origin: content-box;
  background-position: 0 0;
  background-size: 100% var(--line);
  background-repeat: repeat-y;
  background-clip: border-box;
  line-height: var(--line);
  min-height: calc(var(--line) * 3);
}

.sentence {
  margin: 0;
  font: 400 1.5rem/var(--line) var(--serif);
  max-width: 34em;
}

mark.hl {
  color: inherit;
  background: linear-gradient(transparent 38%, var(--hl) 38%, var(--hl) 90%, transparent 90%);
  padding: 0 0.12em;
  margin: 0 -0.04em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.gap {
  display: inline-block;
  min-width: calc(var(--len, 5) * 0.62em);
  border-bottom: 2px solid var(--accent);
  line-height: 1.1;
  color: var(--accent);
  text-align: left;
}

.speak {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink-soft);
  flex: none;
}

.speak:hover { color: var(--accent); border-color: var(--accent); }

/* sentence speaker sits at the right end of the first ruled line */
.ruled { position: relative; }

.sentence:has(.speak-inline) { padding-right: 36px; }

.speak-inline {
  position: absolute;
  top: calc((var(--line) - 28px) / 2);
  right: calc(var(--card-pad) - 6px);
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
}

.speak-inline svg { width: 18px; height: 18px; }

.no-tts .speak { display: none; }

/* headword in the card header — written above the red line, like the title of an index card */
.headword {
  margin: 0;
  font: 700 2.5rem/1.05 var(--serif);
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}

.word-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 12px;
  margin-top: 6px;
  color: var(--ink-soft);
}

.ipa { font: 400 1.1rem var(--serif); color: var(--ink-soft); }

.pos { font: italic 400 1.05rem var(--serif); color: var(--ink-soft); }

.translation {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.sentence-ru { margin: 4px 0 0; color: var(--ink-soft); }

.eq { color: var(--ink); font-weight: 600; }

.prompt-ru {
  margin: 18px 0 6px;
  font-size: 1.1rem;
}

.reveal { padding-top: 14px; animation: drop-in 0.16s ease-out; }

.reveal-link { margin-top: 16px; }

/* answer part of the card, below a fold line */
.answer {
  margin-top: 18px;
  padding-top: 20px;
  border-top: 1px dashed var(--line-strong);
  animation: drop-in 0.16s ease-out;
}

.headword-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  margin-bottom: 8px;
}

.headword-row .headword { font-size: 2rem; }

.headword-row .speak { align-self: center; }

.definition {
  margin: 10px 0 0;
  font: italic 400 1.1rem/1.45 var(--serif);
  color: var(--ink-soft);
}

.examples {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.examples li { display: grid; gap: 1px; }

.ex-en { font: 400 1.15rem/1.45 var(--serif); }

.ex-ru { font-size: 0.92rem; color: var(--ink-soft); }

.collocations { margin: 16px 0 0; }

.collocations span,
.note b { color: var(--ink-faint); font-weight: 500; }

.note { margin: 10px 0 0; }

.answer-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 20px;
}

.answer-form { margin-top: 14px; }

.hint-line { margin: 0 0 10px; color: var(--ink-soft); }

.hint-line b { color: var(--ink); font-weight: 600; }

.answer-input {
  width: 100%;
  max-width: 420px;
  padding: 6px 2px;
  border: none;
  border-bottom: 2px solid var(--ink);
  background: transparent;
  font: 400 1.5rem var(--serif);
  border-radius: 0;
}

.answer-input:focus { outline: none; border-bottom-color: var(--accent); }

.answer-input::placeholder { color: var(--ink-faint); }

.result { margin: 18px 0 0; font-weight: 600; font-size: 1.05rem; }

.result-correct { color: var(--good); }
.result-form,
.result-close { color: var(--hard); }
.result-wrong { color: var(--again); }

.result .your { display: block; font-weight: 400; color: var(--ink-soft); font-size: 0.95rem; }

.card-message h2 {
  margin: 0;
  font: 700 1.9rem/var(--line) var(--serif);
}

.card-message > .actions { margin-top: 8px; }

.card-message p { margin: 0; max-width: 52ch; }

.card-message .ruled p { font: 400 1.2rem/var(--line) var(--serif); }

.caret {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  margin-left: 4px;
  vertical-align: -0.15em;
  background: var(--accent);
  animation: blink 1s steps(2, start) infinite;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 20px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--paper);
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
}

.btn:hover { border-color: var(--ink-soft); }

.btn:disabled { opacity: 0.55; cursor: default; }

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

.btn-primary:hover { border-color: var(--accent); filter: brightness(1.08); }

.btn-big { padding: 16px 20px; font-size: 1.1rem; }

.btn-wide { width: 100%; }

.btn-link {
  padding: 0;
  border: none;
  background: none;
  color: var(--accent);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.btn-link:disabled { color: var(--ink-faint); cursor: default; }

.btn-danger { color: var(--again); }

kbd {
  font: 500 0.72rem/1 var(--sans);
  padding: 3px 5px;
  border: 1px solid currentColor;
  border-radius: 4px;
  opacity: 0.55;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.actions.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.actions.end { justify-content: flex-end; }

/* ---------- review ---------- */

.counts {
  display: flex;
  gap: 20px;
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.counts b { font-variant-numeric: tabular-nums; font-weight: 600; margin-right: 4px; }

.counts .c-new b { color: var(--accent); }
.counts .c-learn b { color: var(--again); }
.counts .c-rev b { color: var(--good); }

.grades {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  width: 100%;
}

.grade {
  position: relative;
  display: grid;
  gap: 2px;
  justify-items: start;
  padding: 12px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--paper);
  text-align: left;
}

.grade:hover { border-color: currentColor; }

.grade-label { font-weight: 600; }

.grade-ivl { font-size: 0.85rem; color: var(--ink-soft); font-variant-numeric: tabular-nums; }

.grade kbd { position: absolute; top: 10px; right: 10px; }

.grade-again { color: var(--again); }
.grade-hard { color: var(--hard); }
.grade-good { color: var(--good); }
.grade-easy { color: var(--easy); }

.grade.suggested { border-color: currentColor; box-shadow: inset 0 0 0 1px currentColor; }

/* ---------- level ruler ---------- */

.level-panel { margin-top: 34px; }

.level-text { display: flex; gap: 10px; align-items: baseline; color: var(--ink-soft); }

.level-text b { font: 700 1.3rem var(--serif); color: var(--ink); }

.ruler {
  position: relative;
  margin-top: 10px;
  padding-top: 12px;
}

.ruler-track {
  height: 16px;
  border-bottom: 1px solid var(--ink-soft);
  border-right: 1px solid var(--ink-soft);
  background:
    repeating-linear-gradient(to right, var(--ink-soft) 0 1px, transparent 1px calc(100% / 6)) left bottom / 100% 14px no-repeat,
    repeating-linear-gradient(to right, var(--line-strong) 0 1px, transparent 1px calc(100% / 24)) left bottom / 100% 6px no-repeat;
}

.ruler-marker {
  position: absolute;
  top: 0;
  left: var(--pos, 0%);
  width: 0;
  height: 0;
  margin-left: -7px;
  border: 7px solid transparent;
  border-top: 10px solid var(--margin);
  border-bottom: 0;
  transition: left 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.ruler-labels {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  margin-top: 4px;
  font: 400 0.95rem var(--serif);
  color: var(--ink-soft);
}

.ruler-labels span { padding-left: 4px; }

.level-note { margin: 12px 0 0; color: var(--ink-soft); font-size: 0.95rem; }

/* ---------- dictionary ---------- */

.add-word {
  display: flex;
  gap: 10px;
  margin: 22px 0 18px;
}

.add-word input { flex: 1; }

.input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--paper);
}

.input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.words-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  margin-bottom: 8px;
}

.words-bar .input { max-width: 260px; }

.seg { display: flex; gap: 18px; }

.seg button {
  position: relative;
  padding: 6px 0;
  border: none;
  background: none;
  color: var(--ink-soft);
  font-weight: 500;
}

.seg button.active { color: var(--ink); }

.seg button.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--margin);
}

.seg b { font-weight: 500; color: var(--ink-faint); margin-left: 4px; }

.word-list {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--paper);
  border-radius: 5px;
  box-shadow: var(--shadow);
}

.word-row + .word-row { border-top: 1px solid var(--rule); }

.row-main {
  display: grid;
  grid-template-columns: minmax(120px, 1.1fr) 1.6fr auto;
  gap: 14px;
  align-items: baseline;
  width: 100%;
  padding: 13px 20px;
  border: none;
  background: none;
  text-align: left;
}

.row-word { font: 700 1.15rem var(--serif); overflow-wrap: anywhere; }

.row-tr { color: var(--ink-soft); }

.row-status { font-size: 0.85rem; white-space: nowrap; color: var(--ink-faint); }

.st-learning { color: var(--ink-soft); }
.st-due { color: var(--again); }
.st-queued { color: var(--accent); }
.st-mature { color: var(--good); }

.row-detail {
  padding: 2px 20px 20px;
  animation: drop-in 0.16s ease-out;
}

.row-detail .examples { margin-top: 12px; }

.row-detail .answer-tools { margin-top: 16px; }

.empty {
  padding: 32px 20px;
  text-align: center;
  color: var(--ink-soft);
}

/* ---------- forms ---------- */

.form { display: grid; gap: 26px; margin-top: 22px; }

.field { display: grid; gap: 8px; margin: 0; padding: 0; border: none; }

.field > label,
.field > legend { font-weight: 600; padding: 0; }

.field > label b { font: 700 1.15rem var(--serif); margin-left: 8px; }

.help { margin: 0; font-size: 0.92rem; color: var(--ink-soft); max-width: 60ch; }

.form-error { margin: 0; color: var(--again); }

.form-error:empty { display: none; }

.field input[type='number'] { max-width: 120px; }

input[type='range'] { width: 100%; accent-color: var(--accent); }

.range-labels {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  font: 400 0.9rem var(--serif);
  color: var(--ink-soft);
}

.choice {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
  align-items: baseline;
  font-weight: 400;
  cursor: pointer;
}

.choice input { margin: 0; accent-color: var(--accent); }

.choice small { grid-column: 2; color: var(--ink-soft); font-size: 0.9rem; }

.section { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line-strong); }

.section h2 { margin: 0 0 6px; font: 700 1.4rem var(--serif); }

.section p { margin: 0 0 14px; color: var(--ink-soft); }

/* ---------- onboarding ---------- */

.onb-title { margin: 0; font: 700 1.9rem/1.2 var(--serif); }

.levels { display: grid; margin: 4px 0 26px; }

.level-opt {
  position: relative;
  display: grid;
  grid-template-columns: 52px 1fr;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--rule);
  cursor: pointer;
}

.level-opt input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.lv-code { font: 700 1.3rem var(--serif); color: var(--ink-soft); }

.lv-desc { color: var(--ink-soft); }

.level-opt:has(input:checked) .lv-code { color: var(--ink); }

.level-opt:has(input:checked) .lv-desc { color: var(--ink); }

.level-opt:has(input:checked) .lv-desc span {
  background: linear-gradient(transparent 45%, var(--hl) 45%, var(--hl) 92%, transparent 92%);
}

.level-opt:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }

.onb-note { color: var(--ink-soft); max-width: 60ch; }

/* ---------- toast ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  max-width: min(520px, calc(100vw - 32px));
  padding: 12px 18px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--paper);
  transform: translate(-50%, 20px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 10;
}

.toast.show { opacity: 1; transform: translate(-50%, 0); }

@keyframes drop-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

@keyframes blink {
  to { visibility: hidden; }
}

/* ---------- small screens ---------- */

@media (max-width: 640px) {
  :root {
    --line: 2.1rem;
    --card-pad: 20px;
  }

  .topbar { flex-wrap: wrap; gap: 10px 16px; padding: 14px 16px 4px; }

  .brand { flex: 1; }

  .nav { order: 3; flex-basis: 100%; justify-content: space-between; gap: 6px; font-size: 0.86rem; }

  .badge { margin-left: 4px; }

  .main { padding: 8px 16px 64px; }

  .sentence { font-size: 1.28rem; }

  .headword { font-size: 2rem; }

  /* Answer buttons stay under the thumb while a long card scrolls behind them. */
  .actions.dock {
    position: sticky;
    bottom: 0;
    z-index: 5;
    margin: -12px -16px 0;
    padding: 16px 16px max(12px, env(safe-area-inset-bottom));
    background: linear-gradient(to bottom, transparent, var(--desk) 16px);
  }

  .grades { gap: 6px; }

  .grade { justify-items: center; padding: 10px 4px; text-align: center; }

  .toast { top: 12px; bottom: auto; transform: translate(-50%, -20px); }

  .row-main { grid-template-columns: 1fr auto; padding: 12px 16px; }

  .row-tr { grid-column: 1 / -1; grid-row: 2; }

  .row-detail { padding: 2px 16px 18px; }

  .add-word { flex-direction: column; }

  .words-bar .input { max-width: none; }

  .actions .btn kbd,
  .reveal-link kbd,
  .grade kbd { display: none; }
}

/* Phones narrower than 380px: keep all four sections on one line. */
@media (max-width: 380px) {
  .nav { font-size: 0.82rem; }
}

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