/* ------------------------------------------------------------------
   Cahier — the app is a French exercise book.
   Seyès ruling, blue ink, the red margin rule down the left.
   The one bold move: you write your answer on the rule, and the rule
   itself is what tells you whether you were right.
   ------------------------------------------------------------------ */

:root {
  --paper:      #FAFAF6;
  --paper-deep: #F2F2EA;
  --rule:       #B9C0DE;
  --rule-soft:  #DCE0EF;
  --margin:     #E0798F;
  --ink:        #1B2A4A;
  --ink-soft:   #6B7794;
  --good:       #2E7D5B;
  --bad:        #C9455E;

  --rhythm: 34px;

  --display: "Spectral", Iowan Old Style, Palatino, Georgia, serif;
  --ui: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, Segoe UI, sans-serif;

  --page: 39rem;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 16px;
  line-height: 1.55;
  padding: 0 1.5rem 4rem 3.25rem;
  min-height: 100vh;
  overflow-x: hidden;
}

/* The red vertical margin of a French exercise book. */
.margin-rule {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 2.25rem;
  width: 1px;
  background: var(--margin);
  opacity: .5;
  pointer-events: none;
  z-index: 0;
}

main, .topbar, .foot { position: relative; z-index: 1; max-width: var(--page); }

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

.topbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.75rem 0 1.25rem;
  border-bottom: 1px solid var(--rule-soft);
  margin-bottom: 2.25rem;
}

.wordmark { text-decoration: none; color: inherit; display: flex; align-items: baseline; gap: .5rem; }
.wordmark-fr {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -.01em;
}
.wordmark-sub {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--ink-soft);
}

.nav { display: flex; gap: 1.25rem; }
.nav-link {
  font-size: .8rem;
  color: var(--ink-soft);
  text-decoration: none;
  padding-bottom: .15rem;
  border-bottom: 1.5px solid transparent;
}
.nav-link:hover { color: var(--ink); }
.nav-link.is-on { color: var(--ink); border-bottom-color: var(--margin); }

/* --------------------------------------------------------- type bits */

.eyebrow {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .16em;
  color: var(--ink-soft);
  margin: 0 0 .75rem;
}
.eyebrow-tight { margin-top: 2.5rem; }

.page-title {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.9rem;
  line-height: 1.15;
  margin: 0 0 .5rem;
  letter-spacing: -.015em;
}
.page-sub { color: var(--ink-soft); font-size: .92rem; margin: 0 0 1.75rem; max-width: 34rem; }
.page-sub code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .85em;
  background: var(--paper-deep);
  padding: .05em .35em;
  border-radius: 2px;
}
.micro { font-size: .78rem; color: var(--ink-soft); margin: .6rem 0 0; }

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

.btn {
  font-family: var(--ui);
  font-size: .88rem;
  font-weight: 500;
  padding: .7rem 1.35rem;
  border-radius: 2px;
  border: 1.5px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  transition: background .12s ease, color .12s ease, opacity .12s ease;
}
.btn:hover:not(:disabled) { background: #24365C; }
.btn:disabled { opacity: .38; cursor: default; }

.btn-ghost { background: transparent; color: var(--ink); border-color: var(--rule); }
.btn-ghost:hover:not(:disabled) { background: var(--paper-deep); color: var(--ink); }

.btn-quiet {
  background: transparent;
  color: var(--ink-soft);
  border-color: transparent;
  padding-left: .5rem;
  padding-right: .5rem;
}
.btn-quiet:hover:not(:disabled) { background: transparent; color: var(--ink); }

.link-btn {
  background: none;
  border: 0;
  padding: 0;
  font-family: var(--ui);
  font-size: .82rem;
  color: var(--ink-soft);
  cursor: pointer;
  border-bottom: 1px solid var(--rule);
  margin-top: .75rem;
}
.link-btn:hover { color: var(--ink); border-bottom-color: var(--ink); }

:focus-visible { outline: 2px solid var(--margin); outline-offset: 3px; }

/* ------------------------------------------------------------- today */

.today-head { margin-bottom: 1.75rem; }
.today-count {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(3.4rem, 14vw, 5rem);
  line-height: .92;
  margin: 0;
  letter-spacing: -.03em;
}
.today-label {
  font-family: var(--display);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--ink-soft);
  margin: .5rem 0 0;
  max-width: 26rem;
}

.ledger { margin-top: 3rem; border-top: 1px solid var(--rule-soft); }
.ledger-row {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  padding: .6rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.ledger-key { font-size: .82rem; color: var(--ink-soft); }
.ledger-val { font-family: var(--display); font-weight: 600; font-size: 1.05rem; margin-left: auto; }

.remind { margin-top: 2.25rem; }
.remind-line { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; font-size: .85rem; cursor: pointer; }
.remind-line input[type=checkbox] { accent-color: var(--ink); width: 1rem; height: 1rem; }
.remind select {
  font-family: var(--ui);
  font-size: .85rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: .15rem .3rem;
}

/* ------------------------------------------------------------- drill */

.drill-top { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.drill-top .eyebrow { margin-bottom: .5rem; }
.timer {
  font-family: var(--display);
  font-variant-numeric: tabular-nums;
  font-size: 1rem;
  color: var(--ink-soft);
  margin: 0 0 .5rem;
}
.timer.is-low { color: var(--bad); }

.track { height: 2px; background: var(--rule-soft); overflow: hidden; }
.track-fill { height: 100%; width: 100%; background: var(--rule); transform-origin: left center; }

.card {
  padding: 2.5rem 0 1.5rem;
  min-height: 17rem;
}

/* Seyès ruling, faint, behind the writing. */
.ruled {
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent calc(var(--rhythm) - 1px),
    var(--rule-soft) calc(var(--rhythm) - 1px),
    var(--rule-soft) var(--rhythm)
  );
  background-position: 0 .5rem;
}

.card-tag {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--margin);
  margin: 0 0 .5rem;
  min-height: 1rem;
}

.prompt {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(2.1rem, 8.5vw, 3.1rem);
  line-height: var(--rhythm);
  letter-spacing: -.02em;
  margin: 0 0 2rem;
  word-break: break-word;
}

.answer-well { position: relative; }

.answer {
  width: 100%;
  font-family: var(--display);
  font-size: 1.5rem;
  line-height: var(--rhythm);
  color: var(--ink);
  background: transparent;
  border: 0;
  padding: 0 0 .3rem;
  outline: none;
}
.answer::placeholder { color: var(--rule); font-style: italic; }
.answer:focus-visible { outline: none; }
.answer-well:focus-within .answer-line { background: var(--rule); }

/* The signature: this line is the verdict. */
.answer-line { position: relative; height: 2px; background: var(--rule-soft); transition: background .15s ease; }
.answer-line i {
  position: absolute;
  inset: 0;
  transform: scaleX(0);
  transform-origin: left center;
  background: var(--good);
  transition: transform .38s cubic-bezier(.22,.61,.36,1);
}
.answer-line.is-good i { transform: scaleX(1); background: var(--good); }
.answer-line.is-bad  i { transform: scaleX(1); background: var(--bad); }

.accents { display: flex; flex-wrap: wrap; gap: .3rem; margin-top: .75rem; }
.accent {
  font-family: var(--display);
  font-size: .95rem;
  min-width: 2rem;
  padding: .25rem .4rem;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  cursor: pointer;
}
.accent:hover { color: var(--ink); border-color: var(--rule); background: var(--paper-deep); }

.verdict { margin-top: 1.5rem; }
.verdict-word {
  font-family: var(--display);
  font-size: 1.3rem;
  margin: 0;
  line-height: var(--rhythm);
}
.verdict-word.is-good { color: var(--good); }
.verdict-word.is-bad { color: var(--bad); }
.verdict-hint { font-size: .82rem; color: var(--ink-soft); margin: .15rem 0 0; font-style: italic; }

.drill-actions { display: flex; align-items: center; gap: .6rem; margin-top: 1.75rem; flex-wrap: wrap; }

/* -------------------------------------------------------------- done */

.done-line {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.2rem, 9vw, 3rem);
  line-height: 1.05;
  margin: 0 0 .5rem;
  letter-spacing: -.02em;
}
.done-sub { color: var(--ink-soft); font-family: var(--display); font-style: italic; font-size: 1.1rem; margin: 0; }

/* ------------------------------------------------------------- lists */

.learned-list, .shaky-list { list-style: none; padding: 0; margin: 0; }

.learned-list li, .shaky-list li {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  padding: .55rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.w-fr { font-family: var(--display); font-weight: 600; font-size: 1.05rem; }
.w-en { color: var(--ink-soft); font-size: .88rem; }
.w-meta {
  margin-left: auto;
  font-size: .72rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.learned-list .w-fr::before {
  content: "✓";
  color: var(--good);
  font-family: var(--ui);
  font-size: .78rem;
  margin-right: .5rem;
  vertical-align: .05em;
}
.shaky-list .w-meta { color: var(--bad); }

.empty { color: var(--ink-soft); font-style: italic; font-family: var(--display); max-width: 30rem; }

/* --------------------------------------------------------------- add */

.add-text {
  width: 100%;
  font-family: var(--display);
  font-size: 1rem;
  line-height: var(--rhythm);
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  padding: .5rem .75rem;
  margin-bottom: 1.25rem;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent calc(var(--rhythm) - 1px),
    var(--rule-soft) calc(var(--rhythm) - 1px),
    var(--rule-soft) var(--rhythm)
  );
  background-position: 0 .5rem;
  resize: vertical;
}
.add-text:focus { outline: none; border-color: var(--rule); }
.add-text::placeholder { color: var(--rule); }

.add-result { margin-top: 1.25rem; font-size: .88rem; }
.add-result.is-good { color: var(--good); }
.add-result.is-bad { color: var(--bad); }

/* ------------------------------------------------------------- footer */

.foot {
  margin-top: 4rem;
  padding-top: 1rem;
  display: flex;
  align-items: center;
  gap: .75rem;
  font-size: .7rem;
  color: var(--rule);
  border-top: 1px solid var(--rule-soft);
  letter-spacing: .04em;
}

/* -------------------------------------------------------------- misc */

.view[hidden] { display: none; }

@media (max-width: 34rem) {
  body { padding: 0 1rem 3rem 2rem; }
  .margin-rule { left: 1.1rem; }
  .topbar { padding-top: 1.25rem; margin-bottom: 1.75rem; }
  .nav { gap: 1rem; }
  .drill-actions { gap: .4rem; }
  .btn { padding: .65rem 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}