/* ── Reset & base ────────────────────────────────────────────────────────────── */

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

[hidden] { display: none !important; }

:root {
  /* ── Sumi-e palette — washi paper, sumi ink, shu vermilion, kuri chestnut, matcha tea green ── */

  /* Neutrals — washi (paper) */
  --bg:          #F5F1E8;   /* washi.100 — page bg */
  --surface:     #FFFFFF;
  --surface-2:   #EDE7D8;   /* washi.200 */
  --border:      #D9D2BE;   /* washi.300 */
  --border-dark: #B8AE96;   /* washi.400 */

  --text:        #1A1614;   /* washi.800 — sumi ink near-black */
  --text-muted:  #5A5246;   /* washi.600 */
  --text-faint:  #8C826E;   /* washi.500 */

  /* "Milk Green" → matcha (deep tea green, only for "correct" cues) */
  --mg:          #4F5A38;   /* matcha.500 */
  --mg-light:    #DCE2CE;   /* matcha.100 — soft bg for primary buttons / feedback */
  --mg-mid:      #B8C3A2;   /* matcha.200 */
  --mg-dark:     #2A3019;   /* matcha.700 — strong text on soft bg */

  /* "Milk Red" → shu (vermilion, the single brand accent) */
  --mr:          #A8362A;   /* shu.500 */
  --mr-light:    #F5D8CF;   /* shu.100 */
  --mr-mid:      #E8B6A8;   /* shu.200 */
  --mr-dark:     #6E1815;   /* shu.700 */

  /* "Sand" accent → kuri (chestnut wood — frame, soroban beads, achievement accents) */
  --sand:        #9A7848;   /* kuri.400 */
  --sand-light:  #E8DCC4;   /* kuri.100 */
  --sand-dark:   #5E4520;   /* kuri.600 */

  --radius:      14px;
  --radius-sm:   9px;
  --radius-pill: 999px;

  --shadow:    0 2px 8px rgba(26,22,20,.08), 0 1px 3px rgba(26,22,20,.05);
  --shadow-md: 0 6px 20px rgba(26,22,20,.10), 0 2px 6px rgba(26,22,20,.06);

  /* ── Soroban SVG theme tokens (overridden in dark.css) ── */
  /* Frame & beam = kuri chestnut wood */
  --sb-wood-light:  #B89968;  /* kuri.300 */
  --sb-wood-mid:    #7C5C30;  /* kuri.500 */
  --sb-wood-dark:   #3E2D15;  /* kuri.700 */
  --sb-beam-light:  #D4BF94;  /* kuri.200 */
  --sb-beam-gold:   #9A7848;  /* kuri.400 */
  --sb-beam-dark:   #5E4520;  /* kuri.600 */
  --sb-rod-shadow:  #5A5246;  /* washi.600 */
  --sb-rod-highlight:#EDE7D8; /* washi.200 */
  /* Upper bead — shu vermilion flat fill (schematic) */
  --sb-bead-red-2:  #A8362A;  /* shu.500 */
  --sb-bead-red-text:#FFFFFF;
  /* Lower bead — kuri chestnut flat fill (schematic) */
  --sb-bead-grn-2:  #7C5C30;  /* kuri.500 */
  --sb-bead-grn-text:#FFFFFF;
  /* Idle bead — washi neutral */
  --sb-bead-off-2:  #EDE7D8;  /* washi.200 */
  --sb-bead-off-text:transparent;
  /* Bead strokes */
  --sb-stroke-red:  #6E1815;  /* shu.700 */
  --sb-stroke-grn:  #3E2D15;  /* kuri.700 */
  --sb-stroke-off:  #B8AE96;  /* washi.400 */
  /* Digit labels */
  --sb-label-dim:   #8C826E;  /* washi.500 */
  --sb-label-hot:   #A8362A;  /* shu.500 */
}

body {
  font-family: 'Outfit', system-ui, sans-serif;
  font-size: 13px;
  line-height: 1.5;
  max-width: 1180px;
  margin: 16px auto;
  padding: 0 18px;
  background: var(--bg);
  background-image: radial-gradient(circle, rgba(124,92,48,.10) 1.5px, transparent 1.5px);
  background-size: 28px 28px;
  color: var(--text);
}

h1 {
  font-family: 'Fredoka', system-ui, sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0;
  color: var(--text);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.settings-row {
  display: flex;
  gap: 6px;
  align-items: center;
}

.settings-toggle {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-pill);
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.1s, box-shadow 0.15s, background 0.15s, opacity 0.15s;
  padding: 0;
  line-height: 1;
}

.settings-toggle:hover { background: var(--surface-2); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.settings-toggle:active { transform: translateY(1px); }

.settings-toggle[aria-pressed="false"] {
  opacity: 0.45;
  background: var(--surface-2);
  filter: grayscale(0.6);
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 14px 0;
}

/* ── Selectors row ───────────────────────────────────────────────────────────── */

.selectors-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: flex-start;
}

fieldset {
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 7px 12px 10px;
  margin: 0;
  background: var(--surface);
  box-shadow: var(--shadow);
  min-width: 180px;
}

legend {
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--mg-dark);
  padding: 0 6px;
}

.skill-label {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 3px 0;
  line-height: 1.6;
  cursor: pointer;
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  transition: background 0.1s;
}
.skill-label:hover:not(.skill-unavailable) { background: var(--mg-light); }
.skill-unavailable { opacity: 0.4; cursor: default; }
.skill-recommended .skill-meta { color: var(--sand-dark); }
.skill-meta { color: var(--text-faint); font-size: 11px; }

select {
  font-family: 'Outfit', inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 5px 8px;
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  width: 100%;
  margin-top: 4px;
}
select:focus { outline: 2px solid var(--mg); outline-offset: 2px; }

.key-hint { font-size: 10px; color: var(--text-faint); font-weight: 400; }

/* ── Exercise panel ──────────────────────────────────────────────────────────── */

.exercise-meta {
  margin: 0 0 4px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
}

.prompt {
  font-family: 'Fredoka', sans-serif;
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 4px 0 10px;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

input[type="text"] {
  font-family: ui-monospace, "Cascadia Code", monospace;
  font-size: 1.05rem;
  font-weight: 700;
  padding: 6px 12px;
  width: 130px;
  margin-right: 6px;
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  box-shadow: inset 0 2px 4px rgba(0,0,0,.04);
  transition: border-color 0.15s, box-shadow 0.15s;
}
input[type="text"]:focus {
  outline: none;
  border-color: var(--mg);
  box-shadow: 0 0 0 3px rgba(160,200,152,.20);
}
input[type="text"]:disabled { background: var(--surface-2); color: var(--text-faint); }

button {
  padding: 6px 16px;
  margin: 0 4px 0 0;
  font-family: 'Outfit', inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius-pill);
  background: var(--surface);
  color: var(--text);
  transition: background 0.12s, border-color 0.12s, transform 0.08s, box-shadow 0.12s;
  box-shadow: var(--shadow);
}
button:hover:not(:disabled) {
  background: var(--surface-2);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
button:active:not(:disabled) { transform: translateY(1px); box-shadow: none; }
button:disabled { opacity: 0.35; cursor: default; box-shadow: none; }

/* #btn-submit takes its style from .btn-primary (matcha-soft bg + matcha-strong text). */
/* #btn-next and #btn-undo use the default button style (surface bg, theme-aware). */

/* ── Exercise + grid side-by-side ────────────────────────────────────────────── */

.exercise-row {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  flex-wrap: wrap;
  row-gap: 14px;
}
.exercise-row > #exercise-container { flex: 1 1 320px; min-width: 240px; max-width: 380px; }
.visuals-group {
  display: contents;
}

/* ── Visualization panel ─────────────────────────────────────────────────────── */

.viz-panel {
  display: inline-flex;
  flex-direction: column;
  gap: 0;
  padding: 10px 12px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.viz-tabs {
  display: flex;
  gap: 3px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.viz-tab {
  padding: 3px 9px;
  font-size: 10.5px;
  font-weight: 600;
  font-family: var(--font-body);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  background: var(--surface-2);
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color 0.13s, color 0.13s, background 0.13s;
}
.viz-tab:hover   { border-color: var(--mg-dark); color: var(--mg-dark); background: var(--mg-light); }
.viz-tab.active  { background: var(--mg); border-color: var(--mg-dark); color: #fff; }

.viz-content { min-height: 60px; }

/* shared sub-view layout */
.b10-row  { display: flex; align-items: flex-start; gap: 8px; flex-wrap: wrap; }
.b10-group { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.b10-op   { font-size: 16px; font-weight: 700; color: var(--text-muted); padding-top: 6px; }
.b10-label { font-size: 11px; font-weight: 600; color: var(--text-muted); }
.b10-label-a { color: #8a5050; }
.b10-label-b { color: #507850; }
.viz-msg p { font-size: 12px; color: var(--text-muted); font-style: italic; margin: 4px 0 0; }

/* ── 10×10 number grid ───────────────────────────────────────────────────────── */

.number-grid {
  display: inline-block;
}
.grid-label {
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 6px;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.grid-legend {
  display: flex;
  gap: 12px;
  margin-top: 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
}
.grid-key { display: inline-flex; align-items: center; gap: 5px; }
.grid-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  vertical-align: middle;
}
.grid-dot-a { background: var(--mr);  border: 1px solid var(--mr-dark); }
.grid-dot-b { background: var(--mg);  border: 1px solid var(--mg-dark); }

/* ── Soroban SVG ─────────────────────────────────────────────────────────────── */

#soroban-state { margin: 8px 0; }
#soroban-state.multi-col { display: flex; gap: 24px; align-items: flex-start; }

.soroban-group { display: flex; flex-direction: column; gap: 6px; }
.soroban-group-label {
  font-family: 'Fredoka', sans-serif;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
}

.soroban-cols { display: flex; gap: 10px; align-items: flex-start; }
.soroban-col  { display: flex; flex-direction: column; align-items: center; gap: 4px; }

.soroban-col-label {
  font-family: 'Fredoka', sans-serif;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
}

@keyframes soroban-settle {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.soroban-svg { display: block; animation: soroban-settle 0.18s ease-out both; }
.soroban-svg [data-bead] { will-change: transform; }

.soroban-focused {
  outline: 2.5px solid var(--mg);
  border-radius: var(--radius-sm);
  background: var(--mg-light);
  padding: 4px;
}

.soroban-live {
  outline: 2px solid var(--mg);
  border-radius: 4px;
  background: var(--mg-light);
  padding: 4px;
}

.soroban-placeholder { width: 68px; }
.soroban-placeholder-box {
  width: 68px;
  height: 213px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--border-dark);
  border-radius: var(--radius-sm);
  font-size: 1.5rem;
  color: var(--text-faint);
  background: var(--surface-2);
}

/* ── Rule hint ───────────────────────────────────────────────────────────────── */

#hints {
  display: inline-block;
  margin: 4px 0;
  padding: 5px 14px;
  background: var(--sand-light);
  border: 1.5px solid var(--sand);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  color: var(--sand-dark);
}

/* ── Feedback ────────────────────────────────────────────────────────────────── */

#feedback {
  margin: 0 0 12px;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 13px;
  font-weight: 500;
  max-height: 260px;
  overflow-y: auto;
  scroll-margin-top: 12px;
}
#feedback strong:first-child { font-size: 15px; }
#feedback.correct   { border-color: var(--mg-mid);  background: var(--mg-light); }
#feedback.incorrect { border-color: var(--mr-mid);  background: var(--mr-light); }
#feedback ol { margin: 8px 0 0; padding-left: 22px; }
#feedback hr { margin: 8px 0; border: none; border-top: 1px solid var(--border); }
.note { margin: 4px 0; color: var(--sand-dark); font-style: italic; font-size: 12px; font-weight: 600; }

/* ── Provisional notice ──────────────────────────────────────────────────────── */

.notice-provisional {
  margin: 6px 0;
  padding: 8px 14px;
  background: var(--sand-light);
  border: 1.5px solid var(--sand);
  border-radius: var(--radius);
  color: var(--sand-dark);
  font-size: 12px;
  font-weight: 600;
}

/* ── Dashboard table ─────────────────────────────────────────────────────────── */

table {
  border-collapse: collapse;
  width: 100%;
  margin: 8px 0;
  font-size: 13px;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
th, td {
  border: 1px solid var(--border);
  padding: 7px 10px;
  vertical-align: top;
  text-align: left;
}
thead th {
  background: var(--surface-2);
  color: var(--text-muted);
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  border-color: var(--border);
}

.dashboard-table .gate-cell { font-size: 12px; }

.pass  { color: var(--mg-dark); font-weight: 700; }
.fail  { color: var(--mr-dark); font-weight: 600; }

.row-locked      { color: var(--text-faint); }
.row-mastered    { background: var(--mg-light); }
.row-provisional { background: var(--sand-light); }
.row-rusty       { background: #fdf6e8; color: var(--sand-dark); }
.row-incorrect   { background: var(--mr-light); }

/* ── Keyboard legend ─────────────────────────────────────────────────────────── */

.keyboard-legend {
  margin: 4px 0 8px;
  padding: 8px 12px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 11px;
  font-weight: 500;
  box-shadow: var(--shadow);
  color: var(--text-muted);
}

.legend-top {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--border);
  justify-content: center;
}

/* ── Global keys bar (persistent cheat sheet above the app layout) ────── */
.global-keys {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  margin: 10px 0 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  box-shadow: var(--shadow);
}
.global-keys:empty { display: none; }

.legend-split {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding-top: 6px;
}

.legend-col { display: flex; flex-wrap: wrap; gap: 4px 6px; align-items: center; }
.legend-col-sub { justify-content: flex-start; }
.legend-col-add { justify-content: flex-end; }

.legend-col-title {
  font-weight: 700;
  color: var(--text);
  margin-right: 4px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 10px;
}

.legend-control { display: inline-flex; align-items: center; gap: 4px; }

.legend-key { display: inline-flex; align-items: center; gap: 3px; }

/* ── Foldable practice options (Support / Mode) ──────────────────────────── */

/* ── Top row of practice panel: difficulty pill (left) + subtract/add legend (right) ── */
.practice-top-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.practice-top-row > #legend-container { flex: 0 1 auto; }
.practice-top-row .keyboard-legend { margin: 0; }

.selectors-fold {
  margin-bottom: 0;
}
.selectors-fold > summary {
  list-style: none;
  cursor: pointer;
}
.selectors-fold > summary::-webkit-details-marker { display: none; }

.selectors-summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  user-select: none;
  transition: border-color 0.15s, color 0.15s;
}
.selectors-summary:hover {
  border-color: var(--border-dark);
  color: var(--text);
}

.selectors-summary-icon { font-size: 14px; }
.selectors-summary-caret {
  font-size: 10px;
  opacity: 0.6;
  transition: transform 0.18s ease;
}
.selectors-fold[open] .selectors-summary-caret { transform: rotate(180deg); }

.selectors-fold[open] .selectors-row {
  margin-top: 10px;
}

kbd {
  display: inline-block;
  padding: 1px 7px;
  border: 1.5px solid var(--border-dark);
  border-bottom-width: 2.5px;
  border-radius: 6px;
  background: var(--surface-2);
  font-family: ui-monospace, monospace;
  font-size: 11px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
}

.legend-controls kbd { margin-right: 3px; }

/* ── Sequence display ────────────────────────────────────────────────────────── */

.token-chip {
  display: inline-block;
  padding: 2px 10px;
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  margin: 1px 2px;
}

.token-chip.correct   { background: var(--mg-light); border-color: var(--mg-mid); color: var(--mg-dark); }
.token-chip.incorrect { background: var(--mr-light); border-color: var(--mr-mid); color: var(--mr-dark); }

.seq-empty { color: var(--text-faint); font-style: italic; }
.seq-label { font-family: 'Fredoka', sans-serif; font-weight: 600; color: var(--text-muted); margin-right: 6px; font-size: 12px; }

.reflex-sequence {
  min-height: 34px;
  padding: 5px 12px;
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius);
  background: var(--surface);
  display: inline-block;
  min-width: 140px;
  margin-bottom: 8px;
  box-shadow: inset 0 2px 4px rgba(0,0,0,.04);
}

.sequence-built { margin: 4px 0 8px; padding: 4px 0; }

/* ── Sequence feedback table ─────────────────────────────────────────────────── */

.seq-table { width: auto; margin: 8px 0 0; font-size: 12px; }
.seq-table th, .seq-table td { padding: 4px 12px; text-align: center; }

/* ── Place-value visualization ─────────────────────────────────────────────── */
/* Algebraic mirror of the soroban — each column = one rod. Renders below the
 * exercise row when soroban is visible. Highlights the carry/borrow column.
 */
.place-value {
  margin: 16px 0;
  padding: 14px 18px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.place-value:empty { display: none; }

.pv-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.pv-title {
  font-family: 'Outfit', system-ui, sans-serif;
  font-weight: 700;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sand);
}
.pv-spec {
  font-size: 10px;
  color: var(--text-faint);
}

.pv-grid {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 2px;
}
.pv-row {
  display: grid;
  grid-template-columns: 64px repeat(var(--pv-cols, 2), 48px);
  align-items: center;
  justify-content: end;
  column-gap: 6px;
}
.place-value[data-cols="3"] .pv-row { grid-template-columns: 64px repeat(3, 48px); }

.pv-label {
  font-family: 'EB Garamond', Georgia, serif;
  font-size: 22px;
  font-weight: 500;
  text-align: right;
  color: var(--text-muted);
}
.pv-label.pv-op    { color: var(--sand-dark); }
.pv-label.pv-result {
  color: var(--text);
  font-size: 24px;
}

.pv-cell {
  font-family: ui-monospace, monospace;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  padding: 4px 0;
  color: var(--text);
  border-radius: 4px;
}
.pv-cell.pv-empty  { color: var(--text-faint); font-weight: 400; }
.pv-cell.pv-op     { color: var(--sand-dark); }
.pv-cell.pv-h-label {
  font-family: 'Outfit', system-ui, sans-serif;
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.pv-cell.pv-carry { background: var(--sand); color: #fff; }
.pv-cell.pv-wrap  { background: var(--mr); color: #fff; }

.pv-divider {
  border: 0;
  border-top: 1.5px solid var(--sand);
  margin: 2px 0 4px;
  width: calc(48px * var(--pv-cols, 2) + 6px * (var(--pv-cols, 2) - 1));
  margin-left: auto;
}
.place-value[data-cols="3"] .pv-divider {
  width: calc(48px * 3 + 6px * 2);
}

.pv-note .pv-cell {
  font-family: 'Outfit', system-ui, sans-serif;
  font-size: 9px;
  font-weight: 600;
  padding: 0;
}
.pv-annot-kuri { color: var(--sand); }
.pv-annot-shu  { color: var(--mr); }

/* ── Button row — right-aligned, Submit primary on the far right ──────────── */

.btn-row {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
  margin-top: 10px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--mg-light);
  border-color: var(--mg);
  color: var(--mg-dark);
  font-weight: 600;
}
.btn-primary:hover { background: var(--mg-mid); border-color: var(--mg-dark); }
.btn-primary:disabled {
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--text-faint);
  cursor: default;
}

/* ── App layout ──────────────────────────────────────────────────────────────── */

.app-layout { display: flex; gap: 16px; align-items: flex-start; }
.tree-panel { flex: 0 0 auto; }
.practice-panel { flex: 1 1 340px; min-width: 0; }

/* ── Skill tree ──────────────────────────────────────────────────────────────── */

.skill-tree-wrap {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 6px;
  display: inline-block;
}

.skill-tree-tracks {
  display: flex;
  justify-content: space-around;
  font-family: 'Fredoka', sans-serif;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  margin-bottom: 4px;
  padding: 0 10px;
}

.skill-tree-svg { display: block; max-width: 100%; }
.skill-node rect { transition: filter 0.15s, stroke-width 0.15s; }
.skill-node:hover rect { filter: brightness(0.94); stroke-width: 2.5; }

/* ── Misc ────────────────────────────────────────────────────────────────────── */

details {
  margin: 4px 0;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

summary {
  cursor: pointer;
  padding: 8px 14px;
  user-select: none;
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  font-size: 13px;
  color: var(--text);
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
summary::-webkit-details-marker { color: var(--mg-dark); }
details[open] summary { border-bottom-color: var(--border); }
details > div { padding: 10px 12px; }

#btn-reset {
  background: var(--mr-light);
  border-color: var(--mr-mid);
  color: var(--mr-dark);
}
#btn-reset:hover:not(:disabled) {
  background: var(--mr);
  border-color: var(--mr);
  color: #fff;
}

/* ── App-mode tabs ──────────────────────────────────────────────────────────── */

.app-mode-tabs {
  display: flex;
  gap: 4px;
  margin: 0 0 14px;
  padding: 5px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: fit-content;
}

.mode-tab {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 7px 18px;
  margin: 0;
  font-family: 'Fredoka', sans-serif;
  font-size: 14px;
  font-weight: 700;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.13s, color 0.13s, transform 0.08s;
  box-shadow: none;
  line-height: 1.1;
}
.mode-tab:hover:not(.active) { background: var(--surface-2); color: var(--text); transform: none; box-shadow: none; }
.mode-tab.active { background: var(--mg); color: #fff; }
.mode-tab.active:hover { background: var(--mg-dark); transform: none; box-shadow: none; }
.mode-tab-hint {
  font-family: 'Outfit', sans-serif;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-top: 2px;
  opacity: 0.85;
  text-transform: uppercase;
}

/* ── Flash Anzan ────────────────────────────────────────────────────────────── */

.flash-anzan-panel {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.fa-screen {
  width: 100%;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
}

.fa-title {
  font-family: 'Fredoka', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  margin: 0;
  color: var(--text);
  letter-spacing: 0.01em;
}

.fa-sub {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
  max-width: 460px;
}

.fa-presets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
  width: 100%;
  margin-top: 4px;
}

.fa-preset {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  gap: 4px;
  padding: 14px 16px;
  margin: 0;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: var(--shadow);
}
.fa-preset:hover {
  border-color: var(--mg);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background: var(--surface);
}
.fa-preset-name {
  font-family: 'Fredoka', sans-serif;
  font-size: 17px;
  font-weight: 700;
  color: var(--mg-dark);
}
.fa-preset-cfg { font-size: 11px; color: var(--text-muted); font-weight: 600; }
.fa-preset-stat {
  font-size: 11px;
  color: var(--text-faint);
  font-weight: 600;
  margin-top: 4px;
  padding-top: 4px;
  border-top: 1px dashed var(--border);
  width: 100%;
}

.fa-hint { font-size: 11px; color: var(--text-faint); margin: 8px 0 0; }

/* ── Stage (countdown / flashing / input) ──────────────────────────────────── */

.fa-stage {
  min-height: 280px;
  justify-content: center;
}

@keyframes fa-pop {
  0%   { transform: scale(0.6); opacity: 0; }
  35%  { transform: scale(1.08); opacity: 1; }
  100% { transform: scale(1);   opacity: 1; }
}

.fa-countdown {
  font-family: 'Fredoka', sans-serif;
  font-size: 7rem;
  font-weight: 700;
  color: var(--mg-dark);
  line-height: 1;
  animation: fa-pop 0.45s ease-out;
  font-variant-numeric: tabular-nums;
}

.fa-number {
  font-family: 'Fredoka', sans-serif;
  font-size: 9rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  min-height: 9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-shadow: 0 2px 12px rgba(78, 120, 72, 0.10);
}
.fa-number.fa-blank { color: transparent; text-shadow: none; }

.fa-progress {
  font-family: 'Outfit', sans-serif;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-top: 8px;
}

/* ── Input phase ───────────────────────────────────────────────────────────── */

.fa-stage-input { gap: 10px; }

.fa-question {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.fa-answer {
  font-family: ui-monospace, 'Cascadia Code', monospace;
  font-size: 2.2rem;
  font-weight: 700;
  text-align: center;
  padding: 8px 16px;
  width: 220px;
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  box-shadow: inset 0 2px 4px rgba(0,0,0,.05);
  margin: 0;
}
.fa-answer:focus {
  outline: none;
  border-color: var(--mg);
  box-shadow: 0 0 0 4px rgba(160,200,152,.25);
}

/* ── Result phase ──────────────────────────────────────────────────────────── */

.fa-result { gap: 8px; }

.fa-result-icon {
  font-size: 4rem;
  line-height: 1;
  animation: fa-pop 0.35s ease-out;
}
.fa-correct .fa-result-icon   { color: var(--mg-dark); }
.fa-incorrect .fa-result-icon { color: var(--mr-dark); }

.fa-result-text {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.7rem;
  font-weight: 700;
}
.fa-correct .fa-result-text   { color: var(--mg-dark); }
.fa-incorrect .fa-result-text { color: var(--mr-dark); }

.fa-result-detail {
  font-size: 16px;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.fa-recap {
  font-family: ui-monospace, monospace;
  font-size: 14px;
  color: var(--text-muted);
  background: var(--surface-2);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-variant-numeric: tabular-nums;
  max-width: 100%;
  overflow-wrap: break-word;
}
.fa-recap-eq { font-weight: 700; color: var(--text); }

.fa-meta {
  font-size: 11px;
  color: var(--text-faint);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ── Flash anzan buttons ───────────────────────────────────────────────────── */

.fa-btn {
  padding: 9px 22px;
  font-family: 'Outfit', sans-serif;
  font-size: 14px;
  font-weight: 600;
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius-pill);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  margin: 0;
  transition: background 0.12s, transform 0.08s, box-shadow 0.12s;
  box-shadow: var(--shadow);
}
.fa-btn:hover { background: var(--surface-2); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.fa-btn:active { transform: translateY(1px); box-shadow: none; }

.fa-btn-primary {
  background: var(--mg);
  border-color: var(--mg);
  color: #fff;
}
.fa-btn-primary:hover { background: var(--mg-dark); border-color: var(--mg-dark); }

.fa-btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
  box-shadow: none;
  padding: 6px 14px;
  font-size: 12px;
}
.fa-btn-ghost:hover { background: var(--surface-2); box-shadow: none; }

.fa-btn-row { display: flex; gap: 10px; margin-top: 6px; flex-wrap: wrap; justify-content: center; }

/* ── Daily Challenge ──────────────────────────────────────────────────────── */

.daily-panel {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.dc-screen {
  width: 100%;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
}

.dc-title {
  font-family: 'Fredoka', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  margin: 0;
  color: var(--text);
  letter-spacing: 0.01em;
}

.dc-sub {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
  max-width: 460px;
}

.dc-stat-row {
  display: flex;
  gap: 14px;
  margin-top: 6px;
}

.dc-stat-row-compact { margin-top: 0; }

.dc-stat {
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 18px;
  min-width: 88px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.dc-stat-value {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--mg-dark);
  line-height: 1;
}

.dc-stat-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.dc-today {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

.dc-calendar {
  display: grid;
  grid-template-columns: repeat(14, 1fr);
  gap: 4px;
  margin-top: 14px;
  width: 100%;
  max-width: 560px;
}

.dc-cell {
  aspect-ratio: 1 / 1;
  border-radius: 6px;
  border: 1.5px solid var(--border);
  font-size: 9px;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
  position: relative;
}

.dc-cell span { font-weight: 600; }

.dc-cell-empty   { background: var(--surface-2); }
.dc-cell-today   { border-color: var(--sand-dark); background: var(--sand-light); color: var(--sand-dark); }
.dc-cell-perfect { background: var(--mg); color: #fff; border-color: var(--mg-dark); }
.dc-cell-pass    { background: var(--mg-mid); color: var(--mg-dark); border-color: var(--mg); }
.dc-cell-miss    { background: var(--mr-light); color: var(--mr-dark); border-color: var(--mr-mid); }

.dc-stage { gap: 18px; }

.dc-progress-bar {
  width: 100%;
  max-width: 480px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  overflow: hidden;
}

.dc-progress-fill {
  height: 100%;
  background: var(--mg);
  transition: width 0.25s ease;
}

.dc-progress-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.dc-prompt {
  font-family: 'Fredoka', sans-serif;
  font-size: 2.6rem;
  font-weight: 600;
  margin: 0;
  color: var(--text);
  letter-spacing: 0.02em;
}

.dc-answer {
  font-family: 'Fredoka', sans-serif;
  font-size: 2rem;
  text-align: center;
  width: 200px;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  outline: none;
  color: var(--text);
}

.dc-answer:focus {
  border-color: var(--mg);
  box-shadow: 0 0 0 3px rgba(160, 200, 152, 0.25);
}

.dc-result-icon {
  font-size: 3rem;
  line-height: 1;
}

.dc-result-score {
  font-family: 'Fredoka', sans-serif;
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--mg-dark);
}

.dc-perfect .dc-result-score { color: var(--sand-dark); }

.dc-result-grid {
  font-size: 1.4rem;
  letter-spacing: 0.15em;
  margin: 4px 0;
}

.dc-result-meta {
  font-size: 12px;
  color: var(--text-muted);
}

.dc-btn {
  font-family: 'Outfit', sans-serif;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border-dark);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s, border-color 0.15s;
  box-shadow: var(--shadow);
}

.dc-btn:hover { background: var(--surface-2); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.dc-btn:active { transform: translateY(1px); box-shadow: none; }

.dc-btn-primary {
  background: var(--mg);
  border-color: var(--mg-dark);
  color: #fff;
}
.dc-btn-primary:hover { background: var(--mg-dark); border-color: var(--mg-dark); }

.dc-btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
  box-shadow: none;
  padding: 6px 14px;
  font-size: 12px;
}
.dc-btn-ghost:hover { background: var(--surface-2); box-shadow: none; }

.dc-btn-row { display: flex; gap: 10px; margin-top: 6px; flex-wrap: wrap; justify-content: center; }

/* ── Transient toast (clipboard feedback, etc.) ───────────────────────────── */

.toast-root {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  background: var(--text);
  color: var(--surface);
  font-family: 'Outfit', sans-serif;
  font-size: 13px;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.toast.toast-show {
  opacity: 1;
  transform: translateY(0);
}

/* ── Achievements ──────────────────────────────────────────────────────────── */

.ach-wrap {
  padding: 8px 0;
}

.ach-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.ach-summary {
  font-size: 13px;
  color: var(--text-muted);
}

.ach-count {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--mg-dark);
  margin-right: 4px;
}

.ach-cert-btn {
  font-family: 'Fredoka', sans-serif;
  font-size: 13px;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1.5px solid var(--sand-dark);
  background: linear-gradient(180deg, var(--sand-light), var(--sand));
  color: var(--sand-dark);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform 0.1s, box-shadow 0.15s;
}

.ach-cert-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(120, 104, 88, 0.25); }
.ach-cert-btn:active { transform: translateY(1px); box-shadow: var(--shadow); }

.ach-group {
  margin-bottom: 14px;
}

.ach-group-title {
  font-family: 'Fredoka', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 8px;
}

.ach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}

.ach-card {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.ach-card.ach-unlocked {
  border-color: var(--mg);
  background: linear-gradient(180deg, var(--mg-light), var(--surface));
  box-shadow: var(--shadow);
}

.ach-card.ach-locked {
  opacity: 0.62;
}

.ach-icon {
  font-size: 1.6rem;
  line-height: 1.1;
  filter: grayscale(0);
  flex-shrink: 0;
}

.ach-card.ach-locked .ach-icon { filter: grayscale(1); }

.ach-body { flex: 1; min-width: 0; }

.ach-label {
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  margin-bottom: 2px;
}

.ach-desc {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

.ach-date {
  font-size: 10px;
  color: var(--mg-dark);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin-top: 4px;
}

.ach-locked .ach-date {
  color: var(--text-faint);
}

/* ── Certificate modal & sheet ────────────────────────────────────────────── */

.cert-modal {
  position: fixed;
  inset: 0;
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow: auto;
}

.cert-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(44, 42, 38, 0.55);
  backdrop-filter: blur(2px);
}

.cert-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  max-width: 900px;
  width: 100%;
}

.cert-sheet {
  background: #fdfaf2;
  background-image:
    radial-gradient(circle at 50% 0%, rgba(200, 184, 154, 0.25), transparent 60%),
    repeating-linear-gradient(45deg, rgba(200, 184, 154, 0.05) 0 2px, transparent 2px 8px);
  border: 8px double var(--sand-dark);
  border-radius: 6px;
  padding: 36px 48px 28px;
  width: 100%;
  position: relative;
  font-family: 'Outfit', sans-serif;
  color: var(--text);
  box-shadow: 0 18px 50px rgba(44, 42, 38, 0.35);
}

.cert-corner {
  position: absolute;
  font-size: 1.4rem;
  color: var(--sand-dark);
  opacity: 0.65;
}

.cert-corner-tl { top: 10px; left: 14px; }
.cert-corner-tr { top: 10px; right: 14px; }
.cert-corner-bl { bottom: 10px; left: 14px; }
.cert-corner-br { bottom: 10px; right: 14px; }

.cert-eyebrow {
  text-align: center;
  font-family: 'Fredoka', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--sand-dark);
  margin-bottom: 6px;
}

.cert-title {
  text-align: center;
  font-family: 'Fredoka', sans-serif;
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
  margin-bottom: 6px;
}

.cert-sub {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 18px;
}

.cert-seal {
  text-align: center;
  font-size: 3.2rem;
  margin: 6px 0 14px;
  filter: drop-shadow(0 2px 4px rgba(120, 104, 88, 0.35));
}

.cert-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  margin: 10px 0 18px;
}

.cert-table th {
  text-align: left;
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sand-dark);
  border-bottom: 1.5px solid var(--sand-dark);
  padding: 6px 10px;
}

.cert-table td {
  padding: 5px 10px;
  border-bottom: 1px solid rgba(120, 104, 88, 0.18);
}

.cert-table td.cert-skill    { font-weight: 600; }
.cert-table td.cert-accuracy,
.cert-table td.cert-latency  { text-align: right; font-variant-numeric: tabular-nums; }
.cert-table td.cert-status   { text-align: right; font-style: italic; color: var(--mg-dark); }

.cert-footer {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  margin-top: 16px;
}

.cert-date, .cert-sig {
  flex: 1;
  text-align: center;
  position: relative;
}

.cert-line {
  height: 1px;
  background: var(--sand-dark);
  margin-bottom: 4px;
}

.cert-line-label {
  font-size: 10px;
  font-family: 'Fredoka', sans-serif;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sand-dark);
}

.cert-line-value {
  font-size: 13px;
  color: var(--text);
  font-style: italic;
  margin-top: 2px;
}

.cert-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ── Stats modal ─────────────────────────────────────────────────────────── */

.stats-modal {
  position: fixed;
  inset: 0;
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow: auto;
}

.stats-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(44, 42, 38, 0.55);
  backdrop-filter: blur(2px);
}

.stats-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 980px;
}

.stats-sheet {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 18px 50px rgba(44, 42, 38, 0.30);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 48px);
}

.stats-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px 10px;
  border-bottom: 1px solid var(--border);
}

.stats-title {
  font-family: 'Fredoka', system-ui, sans-serif;
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
  color: var(--text);
}

.stats-close {
  background: transparent;
  border: 0;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}
.stats-close:hover { background: var(--surface-2); color: var(--text); }

.stats-tabs {
  display: flex;
  gap: 4px;
  padding: 10px 14px 0;
  border-bottom: 1px solid var(--border);
}

.stats-tab {
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 8px 14px;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 0;
  margin-bottom: -1px;
}
.stats-tab:hover { color: var(--text); }
.stats-tab.active {
  color: var(--mg-dark);
  border-bottom-color: var(--mg);
  font-weight: 600;
}

.stats-body {
  padding: 18px 22px;
  overflow: auto;
  flex: 1 1 auto;
}

.stats-body table { width: 100%; }

.stats-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 22px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 0 0 var(--radius) var(--radius);
}

.stats-footer-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.stats-reset {
  background: transparent;
  border: 1px solid var(--mr-dark);
  color: var(--mr-dark);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}
.stats-reset:hover { background: var(--mr-light); }

/* ── Print styles — strip everything except the certificate ───────────────── */

@media print {
  body > *:not(#cert-modal) { display: none !important; }
  body { background: #fff; margin: 0; padding: 0; }
  body.cert-open #cert-modal {
    display: block !important;
    position: static;
    padding: 0;
  }
  body.cert-open .cert-backdrop { display: none; }
  body.cert-open .no-print { display: none !important; }
  body.cert-open .cert-content { max-width: none; }
  .cert-sheet {
    border-color: #888;
    box-shadow: none;
    background: #fff;
    background-image: none;
  }
}

/* ── Pause indicator (idle-protection badge) ──────────────────────────────── */

.pause-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: #f5d77a;
  border: 1.5px solid #b88a1f;
  color: #3d2a00;
  font-family: 'Outfit', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  opacity: 0;
  transform: translateY(2px);
  pointer-events: none;
  /* animation-delay is set inline (= LATENCY_PAUSE_CAP_MS), so this stays
     in sync if the cap ever changes. fill-mode forwards keeps it visible. */
  animation: pause-fade-in 0.35s linear forwards;
}
.pause-indicator .pause-icon { color: #8a3d00; }

@keyframes pause-fade-in {
  to { opacity: 1; transform: translateY(0); }
}

.pause-icon { font-size: 13px; line-height: 1; }
.pause-text { line-height: 1.1; }

@media (prefers-reduced-motion: reduce) {
  .pause-indicator { animation-duration: 0.01s; transform: none; }
}

/* ── Dashboard sparklines ─────────────────────────────────────────────────── */

.trend-col { min-width: 130px; }

.trend-cell {
  padding: 4px 8px;
  white-space: nowrap;
}

.trend-row {
  display: flex;
  align-items: center;
  gap: 6px;
  line-height: 1;
}

.trend-row + .trend-row { margin-top: 2px; }

.trend-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.trend-dot.trend-acc { background: var(--mg-dark); }   /* matcha — accuracy */
.trend-dot.trend-lat { background: var(--mr-dark); }   /* shu — latency */

.spark {
  width: 110px;
  height: 28px;
  display: block;
  flex-shrink: 0;
}

.spark-empty {
  display: inline-block;
  width: 110px;
  height: 28px;
  color: var(--text-faint);
  font-size: 11px;
  text-align: center;
  line-height: 28px;
}

/* ── Responsive: phone-width layout ───────────────────────────────────────── */

@media (max-width: 720px) {
  body {
    margin: 8px auto;
    padding: 0 10px;
    font-size: 13px;
  }

  h1 {
    font-size: 1.3rem;
    margin: 0 0 10px;
  }

  .app-mode-tabs {
    display: flex;
    overflow-x: auto;
    gap: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .app-mode-tabs::-webkit-scrollbar { display: none; }

  .mode-tab {
    flex-shrink: 0;
    padding: 8px 14px;
    font-size: 13px;
  }
  .mode-tab-hint { display: none; }

  .selectors-row {
    flex-direction: column;
    align-items: stretch;
  }
  .selectors-row fieldset {
    min-width: 0;
    width: 100%;
  }

  /* Stack practice layout — skill tree above panel */
  .app-layout {
    flex-direction: column;
  }
  .tree-panel {
    width: 100%;
    max-width: none;
  }

  /* Stack exercise + visuals vertically */
  .exercise-row {
    flex-direction: column;
    align-items: stretch;
  }
  .visuals-group {
    align-items: center;
    gap: 12px;
  }

  /* Larger touch targets */
  button,
  .dc-btn,
  .fa-btn,
  .ach-cert-btn {
    min-height: 40px;
  }
  .dc-answer, .fa-answer { width: 100%; max-width: 220px; }
  .dc-prompt { font-size: 2rem; }
  .fa-number { font-size: 3.2rem; }

  /* Dashboards: let table scroll horizontally rather than crushing columns */
  .dashboard-table,
  #log-container table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

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

  .dc-calendar {
    grid-template-columns: repeat(7, 1fr);
    max-width: 320px;
  }

  /* Certificate scales gracefully */
  .cert-sheet { padding: 22px 18px 16px; }
  .cert-title { font-size: 1.8rem; }
  .cert-table { font-size: 11px; }
  .cert-table th, .cert-table td { padding: 4px 6px; }
}

/* ── Friend-Challenge modal ───────────────────────────────────────────────── */

.challenge-modal {
  position: fixed;
  inset: 0;
  z-index: 9100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow: auto;
}

.challenge-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(44, 42, 38, 0.55);
  backdrop-filter: blur(2px);
}

.challenge-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 560px;
}

.ch-screen {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 14px 40px rgba(44, 42, 38, 0.30);
  padding: 26px 28px 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
}

.ch-eyebrow {
  font-family: 'Fredoka', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mg-dark);
}

.ch-title {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0;
  color: var(--text);
}

.ch-sub {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.ch-score-strip {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 10px 0 4px;
}

.ch-score-box {
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 18px;
  background: var(--surface-2);
  min-width: 130px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: border-color 0.2s, background 0.2s;
}

.ch-score-pending { opacity: 0.6; }

.ch-score-winner {
  border-color: var(--mg);
  background: linear-gradient(180deg, var(--mg-light), var(--surface));
}

.ch-score-num {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.ch-score-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  color: var(--text-muted);
}

.ch-score-time {
  font-size: 12px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.ch-vs {
  font-family: 'Fredoka', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-faint);
  letter-spacing: 0.1em;
}

/* Playing stage */
.ch-stage { gap: 14px; }

.ch-progress-bar {
  width: 100%;
  max-width: 420px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  overflow: hidden;
}

.ch-progress-fill {
  height: 100%;
  background: var(--mg);
  transition: width 0.25s ease;
}

.ch-progress-label {
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
}

.ch-prompt {
  font-family: 'Fredoka', sans-serif;
  font-size: 2.2rem;
  font-weight: 600;
  margin: 4px 0;
  color: var(--text);
}

.ch-answer {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.8rem;
  text-align: center;
  width: 200px;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  outline: none;
}
.ch-answer:focus { border-color: var(--mg); box-shadow: 0 0 0 3px rgba(160,200,152,0.25); }

/* Result */
.ch-result-icon { font-size: 2.6rem; line-height: 1; }
.ch-result-headline {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
}
.ch-result-grid {
  font-size: 1.1rem;
  letter-spacing: 0.18em;
  margin: 4px 0;
}

.ch-me .ch-result-headline   { color: var(--mg-dark); }
.ch-them .ch-result-headline { color: var(--mr-dark); }

/* Buttons */
.ch-btn {
  font-family: 'Outfit', sans-serif;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border-dark);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s, border-color 0.15s;
  box-shadow: var(--shadow);
}
.ch-btn:hover { background: var(--surface-2); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.ch-btn:active { transform: translateY(1px); box-shadow: none; }

.ch-btn-primary {
  background: var(--mg);
  border-color: var(--mg-dark);
  color: #fff;
}
.ch-btn-primary:hover { background: var(--mg-dark); border-color: var(--mg-dark); }

.ch-btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
  box-shadow: none;
  padding: 6px 14px;
  font-size: 12px;
}
.ch-btn-ghost:hover { background: var(--surface-2); box-shadow: none; }

.ch-btn-row { display: flex; gap: 10px; margin-top: 6px; flex-wrap: wrap; justify-content: center; }

@media (max-width: 720px) {
  .ch-screen { padding: 20px 16px; }
  .ch-score-strip { gap: 8px; }
  .ch-score-box { min-width: 0; padding: 10px 12px; }
  .ch-score-num { font-size: 1.4rem; }
  .ch-prompt { font-size: 1.7rem; }
  .ch-answer { width: 100%; max-width: 200px; }
}

/* ── Placement test modal ─────────────────────────────────────────────────── */

.placement-modal, .tutorial-modal {
  position: fixed;
  inset: 0;
  z-index: 9200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow: auto;
}

.placement-backdrop, .tutorial-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(44, 42, 38, 0.55);
  backdrop-filter: blur(2px);
}

.placement-content, .tutorial-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 560px;
}

.pl-screen {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 14px 40px rgba(44, 42, 38, 0.30);
  padding: 26px 28px 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
}

.pl-eyebrow {
  font-family: 'Fredoka', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mg-dark);
}

.pl-title {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.7rem;
  font-weight: 700;
  margin: 0;
  color: var(--text);
}

.pl-sub {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  max-width: 440px;
}

.pl-checklist {
  font-size: 12px;
  color: var(--text-muted);
  padding: 0;
  margin: 4px 0 0;
  list-style: none;
}
.pl-checklist li::before { content: '✓ '; color: var(--mg-dark); font-weight: 700; }

.pl-stage { gap: 14px; }

.pl-progress-bar {
  width: 100%;
  max-width: 420px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  overflow: hidden;
}
.pl-progress-fill { height: 100%; background: var(--mg); transition: width 0.25s ease; }
.pl-progress-label {
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
}

.pl-prompt {
  font-family: 'Fredoka', sans-serif;
  font-size: 2.2rem;
  font-weight: 600;
  margin: 4px 0;
  color: var(--text);
}

.pl-answer {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.8rem;
  text-align: center;
  width: 200px;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  outline: none;
}
.pl-answer:focus { border-color: var(--mg); box-shadow: 0 0 0 3px rgba(160,200,152,0.25); }

.pl-result-icon { font-size: 2.8rem; line-height: 1; }
.pl-result-tier {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--mg-dark);
  margin-top: -2px;
}
.pl-tier-pilot   .pl-result-tier { color: var(--sand-dark); }
.pl-tier-learner .pl-result-tier { color: var(--mg-dark); }
.pl-result-score {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}
.pl-result-message {
  margin: 4px 0 6px;
  font-size: 13.5px;
  color: var(--text);
  max-width: 440px;
}

.pl-band-table {
  width: 100%;
  max-width: 440px;
  border-collapse: collapse;
  font-size: 12px;
}
.pl-band-table td { padding: 4px 6px; border-bottom: 1px solid var(--border); }
.pl-band       { text-align: left; font-weight: 600; color: var(--text); width: 38%; }
.pl-band-score { text-align: right; font-variant-numeric: tabular-nums; color: var(--text-muted); width: 18%; }
.pl-band-bar   { width: 44%; }
.pl-band-bar-track {
  background: var(--surface-2);
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  height: 7px;
  overflow: hidden;
}
.pl-band-bar-fill { height: 100%; background: var(--mg); }

.pl-btn {
  font-family: 'Outfit', sans-serif;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border-dark);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s, border-color 0.15s;
  box-shadow: var(--shadow);
}
.pl-btn:hover { background: var(--surface-2); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.pl-btn:active { transform: translateY(1px); box-shadow: none; }
.pl-btn-primary {
  background: var(--mg);
  border-color: var(--mg-dark);
  color: #fff;
}
.pl-btn-primary:hover { background: var(--mg-dark); }
.pl-btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
  box-shadow: none;
  padding: 6px 14px;
  font-size: 12px;
}
.pl-btn-row { display: flex; gap: 10px; margin-top: 6px; flex-wrap: wrap; justify-content: center; }

/* ── Tutorial modal ───────────────────────────────────────────────────────── */

.tu-screen {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 14px 40px rgba(44, 42, 38, 0.30);
  padding: 24px 26px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
}

.tu-eyebrow {
  font-family: 'Fredoka', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mg-dark);
}

.tu-title {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--text);
}

.tu-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.tu-soroban {
  width: 130px;
  height: auto;
}

.tu-bead-glow {
  animation: tu-glow 1.4s ease-in-out infinite alternate;
}

.tu-beam-glow {
  animation: tu-beam-glow 1.6s ease-in-out infinite alternate;
}

@keyframes tu-glow {
  from { filter: drop-shadow(0 0 0 var(--mg)); }
  to   { filter: drop-shadow(0 0 6px var(--mg)); }
}

@keyframes tu-beam-glow {
  from { filter: brightness(1); }
  to   { filter: brightness(1.4) drop-shadow(0 0 4px var(--sand)); }
}

.tu-body {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text);
  max-width: 460px;
  margin-top: 4px;
}
.tu-body p { margin: 0 0 6px; }
.tu-body p:last-child { margin-bottom: 0; }
.tu-body code {
  font-family: 'Outfit', monospace;
  background: var(--surface-2);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
}

.tu-dots {
  display: flex;
  gap: 6px;
  margin-top: 4px;
}

.tu-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--border);
}
.tu-dot-done   { background: var(--mg-mid); }
.tu-dot-active { background: var(--mg-dark); transform: scale(1.2); }

.tu-btn {
  font-family: 'Outfit', sans-serif;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border-dark);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: var(--shadow);
}
.tu-btn:hover { background: var(--surface-2); transform: translateY(-1px); }
.tu-btn-primary { background: var(--mg); border-color: var(--mg-dark); color: #fff; }
.tu-btn-primary:hover { background: var(--mg-dark); }
.tu-btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
  box-shadow: none;
}
.tu-btn-row {
  display: flex;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

@media (max-width: 720px) {
  .pl-screen, .tu-screen { padding: 20px 16px; }
  .pl-prompt { font-size: 1.6rem; }
  .pl-answer { width: 100%; max-width: 180px; }
  .tu-soroban { width: 110px; }
}

/* ── On-screen keypad ─────────────────────────────────────────────────────── */
.keypad {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 10px 0;
  max-width: 400px;
}
.keypad-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.op-btn {
  flex: 1;
  min-width: 44px;
  padding: 11px 6px;
  font-size: 1rem;
  font-family: var(--font-mono, monospace);
  font-weight: 600;
  border: 2px solid var(--border, #ccc);
  border-radius: 8px;
  background: var(--surface, #fff);
  cursor: pointer;
  transition: background 0.1s, transform 0.08s;
  touch-action: manipulation;
  user-select: none;
}
.op-btn:active {
  transform: scale(0.93);
}
.op-btn.op-add {
  border-color: var(--mg, #5a9e6a);
  color: var(--mg-dark, #2f6840);
  background: var(--mg-light, #eaf5ec);
}
.op-btn.op-add:hover {
  background: var(--mg, #5a9e6a);
  color: #fff;
}
.op-btn.op-subtract {
  border-color: var(--mr, #c05050);
  color: var(--mr-dark, #7a1e1e);
  background: var(--mr-light, #fdf0f0);
}
.op-btn.op-subtract:hover {
  background: var(--mr, #c05050);
  color: #fff;
}
.op-btn.op-undo {
  flex: 0 0 auto;
  padding: 10px 16px;
  border-color: #aaa;
  color: #555;
}
.op-btn.op-clear {
  flex: 0 0 auto;
  padding: 10px 16px;
  border-color: #aaa;
  color: #555;
}
.op-btn:disabled {
  opacity: 0.35;
  cursor: default;
  transform: none;
}
.keypad-controls {
  justify-content: flex-start;
}
.keypad-col-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.col-nav-btn {
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 2px solid var(--border, #ccc);
  border-radius: 8px;
  background: var(--surface, #fff);
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
}
.col-nav-btn:disabled {
  opacity: 0.35;
  cursor: default;
}
.col-focus-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--mg-dark, #2f6840);
}

/* ── Soroban graduated fade-out (#6) ──────────────────────────────────────── */

.soroban-ghost {
  opacity: 0.2;
  transition: opacity 0.5s;
}

.soroban-hidden {
  opacity: 0;
  pointer-events: none;
}


/* ── Camera widget (MediaPipe Hands, step 1: passive overlay) ────────────── */

.camera-widget {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 1000;
  background: rgba(20, 22, 28, 0.88);
  color: #f0f2f6;
  padding: 8px;
  border-radius: 10px;
  font-family: 'Outfit', system-ui, sans-serif;
  font-size: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  max-width: 380px;
}

.camera-controls {
  display: flex;
  gap: 6px;
  align-items: center;
}

.camera-reset,
.camera-submit {
  color: #f0f2f6;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  padding: 6px 10px;
  font: inherit;
  cursor: pointer;
}
.camera-reset { background: rgba(255, 255, 255, 0.12); }
.camera-reset:hover { background: rgba(255, 255, 255, 0.2); }
.camera-submit { background: #5cdc5c; color: #0a1a0a; font-weight: 600; }
.camera-submit:hover { background: #7be97b; }

.camera-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 6px;
  align-items: stretch;
}

.gesture-dictionary {
  margin: 6px 0;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
}
.gesture-dictionary > summary {
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0.75;
  padding: 2px 0;
  user-select: none;
}
.gesture-dictionary > summary:hover { opacity: 1; }

.gdict-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 6px;
  margin-top: 6px;
}
.gdict-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 5px;
  color: #cde0ff;
}
.gdict-icon { flex-shrink: 0; line-height: 0; color: #ffd060; }
.gdict-text { min-width: 0; }
.gdict-title { font-size: 12px; font-weight: 600; color: #fff; }
.gdict-desc { font-size: 11px; opacity: 0.75; }
.gdict-submit .gdict-icon { color: #5cdc5c; }
.gdict-reset  .gdict-icon { color: #ff7070; }
.gdict-next   .gdict-icon { color: #7fc8ff; }

.camera-soroban-row {
  display: flex;
  gap: 2px;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  padding: 4px;
}

.camera-value {
  text-align: center;
  font-family: 'Fredoka', system-ui, sans-serif;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #ffeb3b;
}

.camera-toggle {
  background: #4a86c8;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 6px 12px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.camera-toggle:hover:not(:disabled) { background: #3a72b0; }
.camera-toggle:disabled { opacity: 0.6; cursor: default; }

.camera-stage {
  position: relative;
  width: 320px;
  aspect-ratio: 4 / 3;
}

.camera-video,
.camera-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: 6px;
  transform: scaleX(-1);
}
.camera-video { object-fit: cover; }
.camera-overlay { pointer-events: none; }

.camera-status {
  margin-top: 4px;
  opacity: 0.85;
}

.camera-debug {
  margin: 6px 0 0;
  padding: 6px 8px;
  background: rgba(0, 0, 0, 0.45);
  border-radius: 4px;
  font-family: 'Menlo', monospace;
  font-size: 11px;
  line-height: 1.4;
  color: #cde0ff;
  white-space: pre;
}