/* ==========================================================================
   deckie — shared mockup design system
   "Marsh & Marigold": a pond at golden hour. Warm paper, deep teal water,
   marigold-bill accent, a 9-step feather ramp for duck-level bands.
   ========================================================================== */

:root {
  /* paper & ink */
  --cream:        #FBF1DD;
  --paper:        #F3E6C8;
  --paper-deep:   #E9D6AC;
  --cloud:        #FFFDF6;
  --ink:          #2B2015;
  --ink-soft:     #5B4C38;

  /* pond */
  --pond-deep:    #0F342E;
  --pond:         #1C4A41;
  --pond-light:   #35695C;
  --pond-mist:    #CFE2DA;

  /* accents */
  --marigold:       #F2A93B;
  --marigold-deep:  #D98C1F;
  --marigold-pale:  #FBDCA0;
  --moss:           #6E9C5B;
  --moss-deep:      #4F7A3E;
  --coral:          #E2644B;
  --coral-deep:     #BE4530;

  /* feather ramp — 9 duck-level bands, pale straw → deep pond bronze */
  --band-1: #F6E7B2;
  --band-2: #F2D27A;
  --band-3: #EFC24C;
  --band-4: #E8AE3A;
  --band-5: #D98C1F;
  --band-6: #BD7636;
  --band-7: #8C7B45;
  --band-8: #517566;
  --band-9: #1C4A41;

  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;

  --shadow-paper: 0 1px 2px rgba(43,32,21,.08), 0 10px 24px -10px rgba(43,32,21,.22);
  --shadow-deep:  0 24px 70px -24px rgba(8,26,22,.6);
  --shadow-inset: inset 0 1px 0 rgba(255,255,255,.4);

  --font-display: "Fraunces", "Iowan Old Style", serif;
  --font-body: "Nunito Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: var(--font-display); margin: 0; font-weight: 600; letter-spacing: -0.01em; }

a { color: inherit; text-decoration: none; }

.mono { font-family: var(--font-mono); letter-spacing: 0.02em; }

/* -------------------------------------------------------------------------
   paper texture — apply to any full-bleed surface
   ------------------------------------------------------------------------- */
.grain {
  position: relative;
}
.grain::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--grain);
  opacity: .5;
  pointer-events: none;
  mix-blend-mode: multiply;
}

/* -------------------------------------------------------------------------
   duck mark — the brand mascot, pure CSS/SVG, reused everywhere
   ------------------------------------------------------------------------- */
.duck-mark {
  display: inline-flex;
  flex-shrink: 0;
}
.duck-mark svg { display: block; }

/* -------------------------------------------------------------------------
   top nav — shared chrome across app screens
   ------------------------------------------------------------------------- */
.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1140px;
  margin: 0 auto;
  padding: 20px 40px;
  position: relative;
  z-index: 5;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--cream);
}
.brand .tag {
  font-family: var(--font-mono);
  font-size: .62rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--marigold-pale);
  opacity: .8;
  margin-left: 2px;
}
.nav-links {
  display: flex;
  gap: 28px;
  font-size: .92rem;
  font-weight: 600;
}
.nav-links a {
  color: var(--pond-mist);
  opacity: .75;
  transition: opacity .15s ease;
}
.nav-links a:hover, .nav-links a.active { opacity: 1; color: var(--marigold-pale); }

.avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--marigold);
  border: 2px solid rgba(255,255,255,.5);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 700; color: var(--pond-deep);
}

/* -------------------------------------------------------------------------
   buttons
   ------------------------------------------------------------------------- */
.btn {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: .95rem;
  border: none;
  border-radius: 999px;
  padding: 13px 26px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:active { transform: translateY(1px) scale(.98); }
.btn-primary {
  background: var(--marigold);
  color: var(--pond-deep);
  box-shadow: 0 2px 0 var(--marigold-deep), var(--shadow-paper);
}
.btn-primary:hover { box-shadow: 0 4px 0 var(--marigold-deep), var(--shadow-paper); transform: translateY(-2px); }
.btn-ghost {
  background: transparent;
  color: var(--cream);
  border: 1.5px solid rgba(251,241,221,.35);
}
.btn-ghost:hover { border-color: rgba(251,241,221,.7); }
.btn-dark {
  background: var(--pond-deep);
  color: var(--cream);
  box-shadow: 0 2px 0 #06140f, var(--shadow-paper);
}
.btn-dark:hover { transform: translateY(-2px); }
.btn-outline {
  background: var(--cloud);
  color: var(--ink);
  border: 1.5px solid var(--paper-deep);
}
.btn-outline:hover { border-color: var(--marigold-deep); }
.btn-sm { padding: 8px 16px; font-size: .82rem; }
.btn.cooldown { cursor: default; opacity: .75; }

/* -------------------------------------------------------------------------
   level badge — feather-ramp dot + label, used for duck-level bands
   ------------------------------------------------------------------------- */
.level-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  padding: 5px 12px 5px 8px;
  border-radius: 999px;
  background: var(--cloud);
  border: 1px solid var(--paper-deep);
  color: var(--ink-soft);
}
.level-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.08);
}

/* progress bar (XP) */
.xp-bar {
  height: 10px;
  border-radius: 999px;
  background: var(--paper-deep);
  overflow: hidden;
  position: relative;
}
.xp-bar > span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--marigold-deep), var(--marigold));
  position: relative;
}
.xp-bar > span::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.5));
  animation: shine 2.6s ease-in-out infinite;
}
@keyframes shine { 0%,100% { opacity: .3 } 50% { opacity: .9 } }

/* card surface */
.panel {
  background: var(--cloud);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-paper);
}

/* badges for correct/incorrect (review summary) */
.stamp-mark { flex: none; }
.stamp {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .88rem;
  font-weight: 700;
  padding: 7px 14px;
  border-radius: 10px;
  position: relative;
}
.stamp.correct {
  background: #E7F1DD;
  color: var(--moss-deep);
  border: 1.5px solid var(--moss);
}
.stamp.incorrect {
  background: #FBE4DC;
  color: var(--coral-deep);
  border: 1.5px solid var(--coral);
}

::selection { background: var(--marigold-pale); }

/* -------------------------------------------------------------------------
   mockup picker — dev-only chrome, not part of the in-app UI
   ------------------------------------------------------------------------- */
.mockup-nav {
  position: fixed;
  left: 18px;
  bottom: 18px;
  z-index: 999;
  font-family: var(--font-mono);
  font-size: .72rem;
}
.mockup-nav summary {
  list-style: none;
  cursor: pointer;
  background: var(--ink);
  color: var(--cream);
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px dashed rgba(251,241,221,.4);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.mockup-nav summary::-webkit-details-marker { display: none; }
.mockup-nav[open] summary { border-radius: 10px 10px 0 0; }
.mockup-nav .list {
  background: var(--ink);
  border: 1px dashed rgba(251,241,221,.4);
  border-top: none;
  border-radius: 0 0 10px 10px;
  padding: 6px;
  display: flex;
  flex-direction: column;
  min-width: 190px;
}
.mockup-nav .list a {
  color: var(--pond-mist);
  padding: 7px 10px;
  border-radius: 6px;
}
.mockup-nav .list a:hover { background: rgba(251,241,221,.08); color: var(--marigold-pale); }
.mockup-nav .list a.current { color: var(--marigold); }

/* ==========================================================================
   app styles (beyond the shared mockup design system)
   ========================================================================== */

.splash {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: var(--pond-deep);
}

/* --- auth page --- */
.auth-wrap {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(900px 600px at 50% 10%, #1a4f44 0%, var(--pond-deep) 60%), var(--pond-deep);
  padding: 20px;
}
.auth-panel {
  width: 420px; max-width: 94vw;
  padding: 38px 36px 34px;
  position: relative; z-index: 2;
}
.auth-brand {
  display: flex; align-items: center; justify-content: center; gap: 12px;
}
.auth-brand h1 { font-size: 2rem; }
.auth-sub {
  text-align: center; color: var(--ink-soft); font-size: .92rem;
  margin: 6px 0 22px;
}
.auth-tabs {
  display: flex; gap: 6px; background: var(--paper);
  border-radius: 999px; padding: 4px; margin-bottom: 20px;
}
.auth-tabs button {
  flex: 1; border: none; background: transparent; cursor: pointer;
  font-family: var(--font-body); font-weight: 700; font-size: .9rem;
  color: var(--ink-soft); padding: 9px 0; border-radius: 999px;
}
.auth-tabs button.active { background: var(--cloud); color: var(--ink); box-shadow: var(--shadow-paper); }
.auth-panel label.field { display: block; margin-bottom: 14px; }
.auth-panel label.field span {
  display: block; font-size: .78rem; font-weight: 700;
  color: var(--ink-soft); margin-bottom: 6px;
}
.auth-panel .field input {
  width: 100%; box-sizing: border-box;
  font-family: var(--font-body); font-size: .98rem;
  padding: 12px 13px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--paper-deep); background: var(--cream); color: var(--ink);
}
.auth-panel .field input:focus { outline: none; border-color: var(--marigold-deep); background: var(--cloud); }
.auth-submit { width: 100%; justify-content: center; margin-top: 8px; }
.auth-notice {
  background: #E7F1DD; border: 1.5px solid var(--moss); color: var(--moss-deep);
  border-radius: var(--radius-sm); padding: 10px 13px; font-size: .88rem; margin-bottom: 14px;
}
.auth-error {
  background: #FBE4DC; border: 1.5px solid var(--coral); color: var(--coral-deep);
  border-radius: var(--radius-sm); padding: 10px 13px; font-size: .88rem; margin-bottom: 14px;
}

/* --- authed home --- */
.hero {
  position: relative;
  background: radial-gradient(1200px 500px at 85% -10%, #1f5c50 0%, var(--pond-deep) 55%), var(--pond-deep);
  padding-bottom: 86px;
  overflow: hidden;
}
.wave { position: absolute; left: 0; bottom: -1px; width: 100%; height: 70px; display: block; }
.greeting { max-width: 1140px; margin: 0 auto; padding: 28px 40px 0; position: relative; z-index: 3; }
.greeting h1 { color: var(--cream); font-size: 2.2rem; font-weight: 600; max-width: 640px; line-height: 1.1; }
.greeting h1 em { font-style: italic; color: var(--marigold-pale); font-weight: 500; }
.nav-user { display: flex; align-items: center; gap: 14px; }
.nav-email { font-family: var(--font-mono); font-size: .76rem; color: var(--pond-mist); opacity: .8; }
.deck-section { max-width: 1140px; margin: 26px auto 80px; padding: 0 40px; position: relative; z-index: 4; }
.deck-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr)); gap: 26px; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; margin: 0 0 22px; }
.section-heading h2 { font-size: 1.1rem; color: var(--ink-soft); font-family: var(--font-mono); letter-spacing: .04em; text-transform: uppercase; font-weight: 600; }
.new-deck {
  border: 2px dashed var(--paper-deep); background: transparent; box-shadow: none;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 10px; min-height: 198px; cursor: pointer; color: var(--ink-soft);
  transition: border-color .2s ease, color .2s ease, transform .2s ease;
}
.new-deck:hover { border-color: var(--marigold-deep); color: var(--marigold-deep); transform: translateY(-4px); }
.new-deck .plus {
  width: 46px; height: 46px; border-radius: 50%; border: 2px dashed currentColor;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; font-family: var(--font-display);
}
.new-deck span.label { font-weight: 700; font-size: .95rem; }
.new-deck .coming-soon { font-family: var(--font-mono); font-size: .68rem; opacity: .6; }

/* --- deck page --- */
.bar { background: var(--pond-deep); position: relative; }
a.brand { cursor: pointer; }
.deck-head { max-width: 1140px; margin: 0 auto; padding: 34px 40px 0; }
.crumb {
  font-family: var(--font-mono); font-size: .78rem; color: var(--ink-soft);
  display: inline-flex; align-items: center; gap: 6px; margin-bottom: 18px; opacity: .75;
}
.crumb:hover { color: var(--marigold-deep); }
.deck-head .row { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; flex-wrap: wrap; }
.deck-head h1 { font-size: 2.1rem; }
.deck-head p.desc { color: var(--ink-soft); margin: 8px 0 0; max-width: 520px; font-size: .98rem; }
.deck-stats {
  display: flex; gap: 26px; margin-top: 20px; padding: 16px 0 26px;
  border-bottom: 1px dashed var(--paper-deep); flex-wrap: wrap;
}
.deck-stats .s { font-family: var(--font-mono); font-size: .8rem; color: var(--ink-soft); }
.deck-stats .s b { font-family: var(--font-display); font-size: 1.1rem; color: var(--ink); font-weight: 700; display: block; }

.layout {
  max-width: 1140px; margin: 0 auto; padding: 34px 40px 90px;
  display: grid; grid-template-columns: 1fr 1.35fr; gap: 26px;
}
@media (max-width: 880px) { .layout { grid-template-columns: 1fr; } }
.edit-deck, .card-list-panel, .bulk { grid-column: 1 / -1; }

.deck-head .head-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.list-head-actions { display: flex; gap: 14px; align-items: center; }

.share-section { margin: 14px 0; }
.delete-confirm {
  margin: 12px 0; padding: 12px 14px;
  border: 1.5px dashed var(--coral); border-radius: var(--radius-sm);
  background: #FBE4DC;
}
.delete-confirm .share-url::placeholder { font-style: italic; }
.share-row { display: flex; gap: 8px; align-items: center; }
.share-url {
  flex: 1; box-sizing: border-box; font-family: var(--font-mono); font-size: .78rem;
  padding: 9px 11px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--paper-deep); background: var(--cream); color: var(--ink-soft);
}
.card-row.shared-row { grid-template-columns: 1fr 1.4fr; }

.modal-overlay {
  position: fixed; inset: 0; z-index: 60;
  background: rgba(27, 20, 10, 0.45);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.modal {
  width: 480px; max-width: 100%; max-height: 88vh; overflow-y: auto;
  box-shadow: 0 18px 60px rgba(27, 20, 10, 0.35);
}

.panel-pad { padding: 26px; }
.panel-title {
  font-family: var(--font-mono); font-size: .74rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--marigold-deep); font-weight: 700; margin-bottom: 4px;
}
.panel-sub { color: var(--ink-soft); font-size: .86rem; margin: 2px 0 20px; }

label.field { display: block; margin-bottom: 14px; }
label.field span { display: block; font-size: .78rem; font-weight: 700; color: var(--ink-soft); margin-bottom: 6px; }
label.field em { font-weight: 400; opacity: .6; font-style: normal; }
.field input, .bulk-text {
  width: 100%; box-sizing: border-box; font-family: var(--font-body); font-size: .95rem;
  padding: 11px 13px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--paper-deep); background: var(--cream); color: var(--ink);
}
.field input:focus, .bulk-text:focus { outline: none; border-color: var(--marigold-deep); background: var(--cloud); }
/* placeholders must read as examples, not entered text */
input::placeholder, textarea::placeholder {
  color: var(--ink-soft); opacity: .45; font-style: italic;
}
.form-row { display: flex; gap: 10px; justify-content: flex-end; margin-top: 6px; }
.btn.danger { color: var(--coral-deep); border-color: var(--coral); }

.bulk-text { min-height: 150px; font-family: var(--font-mono); font-size: .86rem; resize: vertical; line-height: 1.6; }
.bulk-errors { font-family: var(--font-mono); font-size: .74rem; color: var(--coral-deep); margin: 8px 0; }
.detect {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--marigold-pale); border-radius: var(--radius-sm);
  padding: 10px 14px; margin-top: 12px;
}
.detect span { font-family: var(--font-mono); font-size: .8rem; font-weight: 700; color: var(--marigold-deep); }
.bulk-done { margin-top: 10px; font-size: .86rem; color: var(--moss-deep); font-weight: 700; }

.list-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 2px; }
.count-label { font-size: .78rem; color: var(--ink-soft); }
.card-list { margin-top: 18px; }
.dist-col { cursor: pointer; border-radius: 8px; }
.dist-col.selected, .dist-col:hover { background: var(--paper); }
.dist-words { margin-top: 16px; border-top: 1px dashed var(--paper-deep); padding-top: 14px; }
.dist-words-head { display: flex; align-items: center; gap: 8px; font-size: .9rem; margin-bottom: 10px; }
.dist-words-head .range { font-size: .72rem; color: var(--ink-soft); }
.word-pills { display: flex; flex-wrap: wrap; gap: 6px; }
.word-pill {
  padding: 3px 12px; border-radius: 999px; background: var(--cream);
  border: 1px solid var(--paper-deep); font-size: .88rem; cursor: pointer;
  font-family: inherit; color: inherit;
}
.word-pill:hover { background: var(--paper); border-color: var(--marigold-deep); }

.pager { display: flex; align-items: center; justify-content: center; gap: 16px; padding-top: 18px; }
.pager-label { font-size: .78rem; color: var(--ink-soft); }
.card-row {
  display: grid; grid-template-columns: 120px 1fr 1.4fr 70px;
  align-items: center; gap: 14px; padding: 13px 4px;
  border-bottom: 1px solid var(--paper);
}
.card-row:last-child { border-bottom: none; }
.card-row .front { font-weight: 700; }
.card-row .level {
  display: flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: .68rem; font-weight: 700;
  letter-spacing: .04em; text-transform: uppercase; color: var(--ink-soft);
}
.card-row .back { color: var(--ink-soft); font-size: .92rem; }
.card-row .more-variants { font-family: var(--font-mono); font-size: .68rem; color: var(--marigold-deep); font-weight: 700; }
.card-row .back { display: flex; flex-wrap: wrap; align-items: center; gap: 5px; }
.card-row .variant-pill {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  background: var(--cream); border: 1px solid var(--paper-deep);
  font-size: .84rem; color: var(--ink); white-space: nowrap;
}
.card-row .hint-inline { opacity: .62; font-style: italic; }
.card-row .icons { display: flex; gap: 8px; justify-content: flex-end; }
.icon-btn {
  width: 28px; height: 28px; border-radius: 8px; border: 1px solid var(--paper-deep);
  background: var(--cream); display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--ink-soft);
}
.icon-btn:hover { border-color: var(--coral); color: var(--coral-deep); }

.new-deck-form { padding: 22px; }
.new-deck-form .field input { width: 100%; }

/* --- learning session (§4.6: focused, full-screen, dark pond) --- */
.session {
  min-height: 100vh;
  background: radial-gradient(900px 600px at 50% 10%, #1a4f44 0%, var(--pond-deep) 60%), var(--pond-deep);
  display: flex; flex-direction: column;
}
.session-top { display: flex; align-items: center; justify-content: space-between; padding: 22px 30px; }
.session-ctl { display: flex; gap: 10px; }
.deck-tag {
  font-family: var(--font-mono); font-size: .76rem; color: var(--pond-mist);
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12);
  padding: 7px 14px; border-radius: 999px;
}
.deck-tag b { color: var(--marigold-pale); font-weight: 600; }
.exit-btn {
  width: 38px; height: 38px; border-radius: 50%; border: 1px solid rgba(255,255,255,.18);
  background: transparent; color: var(--pond-mist); font-size: 1rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.exit-btn:hover { background: rgba(255,255,255,.08); color: var(--cream); }
.session-bar {
  width: 320px; max-width: 70vw; height: 6px; border-radius: 999px;
  background: rgba(255,255,255,.14); margin: 8px auto 0; overflow: hidden;
}
.session-bar > span { display: block; height: 100%; border-radius: 999px; background: var(--marigold); transition: width .3s ease; }
.bar-caption {
  text-align: center; font-family: var(--font-mono); font-size: .72rem;
  color: var(--pond-mist); opacity: .65; margin-top: 12px; letter-spacing: .04em;
}
.session-main {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  justify-content: center; padding: 10px 20px 40px;
}

/* flip card — §4.6: just the text; face encoded by color */
/* §4.2: the learning study card — every face visible at once */
.study-card {
  width: 500px; max-width: 90vw; min-height: 270px;
  border-radius: var(--radius-lg); background: var(--cloud);
  box-shadow: var(--shadow-deep);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; text-align: center; padding: 34px 30px;
}
.study-card .word { font-family: var(--font-display); font-size: 2.5rem; font-weight: 600; color: var(--pond-deep); line-height: 1.1; }
.study-card .mid-line { font-size: 1rem; color: var(--ink-soft); }
.study-card .answers {
  display: flex; flex-direction: column; gap: 6px;
  border-top: 1px dashed var(--paper-deep); padding-top: 14px; margin-top: 2px;
}
.study-card .answer-line { font-family: var(--font-display); font-size: 1.6rem; font-weight: 600; color: var(--pond-deep); line-height: 1.2; }
.hint-line { margin-top: 18px; font-family: var(--font-mono); font-size: .76rem; color: var(--pond-mist); opacity: .7; }
/* inside the cream study card (histogram peek) the session hint color
   is nearly invisible — use ink on cream there */
.study-card .hint-line { margin-top: 4px; color: var(--ink-soft); opacity: .8; }
.controls { display: flex; gap: 14px; margin-top: 36px; align-items: center; }
.controls .btn-ghost:disabled { opacity: .4; cursor: default; }

/* correct-answer toast — floats just above the prompt card */
.prompt-wrap { position: relative; }
.toast {
  position: absolute; top: -54px; left: 50%; transform: translateX(-50%);
  white-space: nowrap; z-index: 40; pointer-events: none;
  font-family: var(--font-mono); font-size: .8rem; font-weight: 700;
  letter-spacing: .04em; text-transform: uppercase;
  background: var(--moss-deep); color: var(--cream);
  padding: 9px 18px; border-radius: 999px;
  box-shadow: var(--shadow-paper);
  animation: toast-pop 2s ease forwards;
}
.sibling-chip.card-notice {
  position: absolute; top: -54px; left: 50%; transform: translateX(-50%);
  white-space: nowrap; margin-top: 0; z-index: 40;
}
.toast.toast-down { background: var(--coral-deep); }
@keyframes toast-pop {
  0% { opacity: 0; transform: translate(-50%, -8px); }
  8%, 82% { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, -4px); }
}

/* quiz */
.prompt-card {
  width: 500px; max-width: 92vw; background: var(--cloud);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-deep);
  padding: 44px 36px; text-align: center;
}
.prompt-word { font-family: var(--font-display); font-size: 2.1rem; font-weight: 600; line-height: 1.15; color: var(--pond-deep); }
.session .answer-row { display: flex; gap: 10px; width: 500px; max-width: 92vw; margin-top: 20px; }
.session .answer-row input {
  flex: 1; font-family: var(--font-body); font-size: 1.05rem; padding: 14px 16px;
  border-radius: var(--radius-sm); border: 2px solid var(--paper-deep);
  background: var(--cream); color: var(--ink);
}
.session .answer-row input:focus { outline: none; border-color: var(--marigold-deep); background: var(--cloud); }
.continue-btn { flex: 1; justify-content: center; }
.reveal-panel {
  width: 500px; max-width: 92vw; margin-top: 14px;
  background: #FBE4DC; border: 1.5px solid var(--coral);
  border-radius: var(--radius-sm); padding: 12px 16px;
  display: flex; flex-direction: column; gap: 2px; text-align: left;
}
.reveal-label { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .08em; text-transform: uppercase; color: var(--coral-deep); font-weight: 700; }
.reveal-answer { font-family: var(--font-display); font-size: 1.3rem; font-weight: 600; color: var(--ink); }
/* Pinyin reveals must not use Fraunces — its macron vowels (ō ū ē, every
   first tone) render as a detached spacing macron. Plex Mono matches the
   mid-line styling used elsewhere and has correct diacritics. */
.reveal-answer.mono { font-family: var(--font-mono); font-size: 1.05rem; }
.reveal-typed { font-family: var(--font-display); font-size: 1.15rem; font-weight: 600; color: var(--ink-soft); margin-bottom: 6px; }
.override-btn { flex: none; }
.sibling-chip {
  margin-top: 14px; font-family: var(--font-mono); font-size: .74rem;
  color: var(--marigold-pale); border: 1px dashed rgba(242,169,59,.55);
  background: rgba(242,169,59,.1); padding: 8px 14px; border-radius: 999px;
}
.card-row .mid-mini { display: block; font-size: .72rem; color: var(--ink-soft); margin-top: 2px; }
.field select {
  width: 100%; box-sizing: border-box; font-family: var(--font-body); font-size: .95rem;
  padding: 11px 36px 11px 13px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--paper-deep); color: var(--ink);
  -webkit-appearance: none; appearance: none;
  background-color: var(--cream);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235B4C38' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 13px center;
  background-size: 12px 8px;
}
.field select:focus { outline: none; border-color: var(--marigold-deep); background-color: var(--cloud); }
.paused-panel {
  display: flex; flex-direction: column; align-items: center; gap: 16px;
  color: var(--pond-mist); font-size: .95rem;
}

/* done / empty */
.done-panel {
  padding: 40px 44px; text-align: center; max-width: 480px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.done-panel h1 { font-size: 1.8rem; }
.done-sub { color: var(--ink-soft); font-size: .95rem; margin: 0; }
.first-try { font-size: .74rem; color: var(--ink-soft); margin-top: 4px; }
.done-actions { display: flex; gap: 12px; margin-top: 16px; }

/* settings */
.radio-label { display: block; font-size: .78rem; font-weight: 700; color: var(--ink-soft); margin-bottom: 8px; }
label.radio { display: flex; align-items: center; gap: 10px; padding: 8px 0; cursor: pointer; font-size: .92rem; }
label.radio input { accent-color: var(--marigold-deep); }
label.radio input { width: auto; flex: none; }
.level-dot.unlearned { background: transparent; border: 1.5px dashed var(--ink-soft); opacity: .5; }
.due-pill {
  font-family: var(--font-mono); font-size: .68rem; font-weight: 600;
  background: var(--coral); color: var(--cloud);
  padding: 3px 9px; border-radius: 999px; letter-spacing: .03em;
  align-self: flex-start; white-space: nowrap;
}
.due-pill.none { background: var(--paper-deep); color: var(--ink-soft); }
.deck-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 22px 22px 24px;
  transition: transform .22s ease, box-shadow .22s ease;
  border-top: 6px solid var(--band-1);
}
.deck-card:nth-child(odd) { transform: rotate(-.6deg); }
.deck-card:nth-child(even) { transform: rotate(.6deg); }
.deck-card:hover { transform: translateY(-6px) rotate(0deg); box-shadow: var(--shadow-deep); }
.deck-card .top-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.deck-card h3 { font-size: 1.28rem; line-height: 1.2; }
.deck-card .meta { font-family: var(--font-mono); font-size: .76rem; color: var(--ink-soft); opacity: .8; }
.deck-card .actions { margin-top: auto; display: flex; gap: 10px; }

/* --- M4: mastery & polish --- */
.xp-bar > span { transition: width .6s ease; }
.xp-row { display: flex; align-items: center; justify-content: space-between; font-family: var(--font-mono); font-size: .72rem; color: var(--ink-soft); }

.stat-row { display: flex; gap: 36px; margin-top: 26px; flex-wrap: wrap; }
.stat { color: var(--pond-mist); }
.stat .num { font-family: var(--font-display); font-size: 1.9rem; font-weight: 700; color: var(--cream); display: block; line-height: 1; }
.stat .label { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; opacity: .65; }
.stat.streak .num { color: var(--marigold); }

/* summary modal */
.summary-panel { max-width: 560px; width: 100%; }
.mastery-tally { text-align: center; margin: 10px 0 0; }
.mastery-tally .big { font-family: var(--font-display); font-size: 3rem; font-weight: 700; color: var(--marigold-deep); line-height: 1; }
.mastery-tally .breakdown { font-family: var(--font-mono); font-size: .78rem; color: var(--ink-soft); margin-top: 6px; }
.divider { border-top: 1px dashed var(--paper-deep); margin: 20px 0 4px; width: 100%; }
.band-groups { width: 100%; text-align: left; }
.band-group { margin: 14px 0; }
.band-head { display: flex; align-items: center; gap: 9px; margin-bottom: 8px; }
.band-head .level-dot { width: 12px; height: 12px; }
.band-head h4 { font-family: var(--font-mono); font-size: .76rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-soft); font-weight: 700; margin: 0; }
.stamp-wrap { display: flex; flex-wrap: wrap; gap: 8px; padding-left: 21px; }

/* distribution histogram */
.dist-panel { grid-column: 1 / -1; }
.dist-chart {
  display: grid; grid-template-columns: repeat(10, 1fr); gap: 10px;
  align-items: end; height: 150px; margin-top: 26px; padding-bottom: 2px;
  border-bottom: 1.5px solid var(--paper-deep);
}
.dist-col { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; position: relative; }
.dist-col .count { font-family: var(--font-mono); font-size: .74rem; font-weight: 600; color: var(--ink-soft); margin-bottom: 5px; }
.dist-col .count.zero { opacity: .4; }
.dist-col .bar {
  width: 100%; max-width: 58px; border-radius: 4px 4px 0 0;
  border: 1px solid rgba(43,32,21,.22); border-bottom: none; min-height: 3px;
  transition: height .5s ease, filter .15s ease;
}
.dist-col .bar.hollow { background: transparent !important; border: 1.5px dashed var(--ink-soft); border-bottom: none; opacity: .6; }
.dist-col:hover .bar { filter: brightness(1.06) saturate(1.1); }
.dist-col:hover .tip { opacity: 1; transform: translate(-50%, 0); }
.dist-col .tip {
  position: absolute; bottom: calc(100% + 6px); left: 50%;
  transform: translate(-50%, 4px); opacity: 0; pointer-events: none;
  transition: opacity .15s ease, transform .15s ease;
  background: var(--ink); color: var(--cream);
  font-family: var(--font-mono); font-size: .68rem; white-space: nowrap;
  padding: 5px 9px; border-radius: 7px; z-index: 4;
}
.dist-labels { display: grid; grid-template-columns: repeat(10, 1fr); gap: 10px; margin-top: 8px; }
.dist-labels span {
  text-align: center; font-family: var(--font-mono); font-size: .62rem;
  font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--ink-soft); opacity: .75;
}