:root {
  /* pure black = transparent on glasses */
  --bg:           #000;
  --bg-2:         #000;
  --bg-3:         #000;

  --paper:        #f7eed8;
  --paper-2:      #e8d8a8;
  --paper-back:   #fff8e8;
  --paper-shade:  #c2a866;
  --paper-edge:   #8b7449;

  --ink:          #f5ecd2;
  --ink-soft:     #d9c89c;
  --ink-dim:      #b09870;
  --ink-faint:    #6a5838;

  --sumi:         #2a2218;     /* deep ink */
  --crease:       #c9b070;     /* existing creases */

  --vermilion:    #ff5a48;     /* hanko red, brightened for AR contrast */
  --vermilion-hi: #ff8a78;
  --vermilion-glow: rgba(255,90,72,0.55);
  --vermilion-faint: rgba(255,90,72,0.16);

  --pad-l:        96px;
  --pad-r:        22px;
  --pad-t:        14px;
  --pad-b:        12px;
}

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

html, body {
  width: 600px;
  height: 600px;
  overflow: hidden;
  background: #000;
  color: var(--ink);
  font-family: "Shippori Mincho", "Cormorant Garamond", "Times New Roman", serif;
  -webkit-font-smoothing: antialiased;
  font-weight: 500;
  font-size: 22px;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

button {
  font-family: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  letter-spacing: inherit;
  padding: 0;
}

#app {
  position: relative;
  width: 600px;
  height: 600px;
  overflow: hidden;
  background: #000;
}

/* ────────── Screen base ────────── */
.screen {
  position: absolute;
  inset: 0;
  width: 600px;
  height: 600px;
  padding: var(--pad-t) var(--pad-r) var(--pad-b) var(--pad-l);
  display: flex;
  flex-direction: column;
  text-align: right;
  align-items: stretch;
}
.hidden { display: none !important; }

/* ────────── Header ────────── */
.head {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  font-size: 22px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  text-transform: uppercase;
  font-weight: 600;
}
.brand-mark {
  font-family: "Shippori Mincho", serif;
  font-weight: 700;
  font-size: 26px;
  color: #000;
  background: var(--vermilion);
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  letter-spacing: 0;
  box-shadow: 0 0 18px var(--vermilion-glow);
  transform: rotate(-3deg);
  flex-shrink: 0;
}
.brand {
  color: var(--ink);
  letter-spacing: 0.22em;
  font-weight: 700;
  font-size: 22px;
  white-space: nowrap;
}
.serial {
  font-family: "Share Tech Mono", monospace;
  color: var(--ink-dim);
  letter-spacing: 0.10em;
  font-weight: 400;
  font-size: 18px;
  margin-left: 2px;
  white-space: nowrap;
}

/* ────────── Menu eyebrow + list ────────── */
.menu-eyebrow {
  margin-top: 14px;
  font-family: "Share Tech Mono", monospace;
  font-size: 16px;
  letter-spacing: 0.30em;
  color: var(--ink-dim);
  text-transform: uppercase;
}

.menu-list {
  margin-top: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1 1 auto;
  min-height: 0;
  justify-content: center;
}

.menu-row {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  padding: 6px 10px 6px 10px;
  border: 1px solid transparent;
  border-radius: 6px;
  transition: border-color 120ms, background 120ms, color 120ms;
  white-space: nowrap;
}
.menu-row .row-name {
  color: var(--ink);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.03em;
  font-family: "Cormorant Garamond", "Shippori Mincho", serif;
  white-space: nowrap;
}
.menu-row .row-meta {
  color: var(--ink-dim);
  font-family: "Share Tech Mono", monospace;
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  min-width: 68px;
  text-align: left;
  white-space: nowrap;
}
.menu-row .row-stars {
  color: var(--vermilion);
  font-size: 16px;
  letter-spacing: 0.10em;
  min-width: 46px;
  text-align: left;
  white-space: nowrap;
}
.menu-row .row-kanji {
  font-family: "Shippori Mincho", serif;
  font-size: 28px;
  color: var(--vermilion);
  letter-spacing: 0;
  width: 32px;
  text-align: center;
  opacity: 0.85;
  flex-shrink: 0;
}
.menu-row.focused {
  border-color: var(--vermilion);
  background:
    linear-gradient(90deg, transparent 0%, rgba(255,90,72,0.14) 100%);
  box-shadow: 0 0 14px var(--vermilion-faint);
}
.menu-row.focused .row-name { color: var(--paper-back); }
.menu-row.focused .row-kanji { opacity: 1; text-shadow: 0 0 10px var(--vermilion-glow); }

/* ────────── Fold screen ────────── */
.fold-chip-row {
  margin-top: 10px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
}
.fold-chip {
  font-family: "Share Tech Mono", monospace;
  font-size: 16px;
  letter-spacing: 0.22em;
  color: var(--vermilion-hi);
  border: 1.5px solid var(--vermilion);
  padding: 4px 12px;
  border-radius: 4px;
  background: rgba(255,90,72,0.10);
  text-transform: uppercase;
  font-weight: 600;
}
.fold-chip.mountain { color: #ffd4a0; border-color: #ffae5e; background: rgba(255,174,94,0.10); }
.fold-chip.squash   { color: #b8e6ff; border-color: #6cb5f0; background: rgba(108,181,240,0.10); }
.fold-chip.petal    { color: #ffb3d8; border-color: #ff6ea8; background: rgba(255,110,168,0.10); }
.fold-chip.reverse  { color: #b8ffc7; border-color: #66e688; background: rgba(102,230,136,0.10); }
.fold-chip.unfold   { color: var(--ink-soft); border-color: var(--ink-dim); background: rgba(176,152,112,0.10); }
.fold-chip.start    { color: var(--ink); border-color: var(--ink-soft); background: rgba(243,231,200,0.08); }
.fold-chip.shape    { color: #ffe2a8; border-color: #f0c662; background: rgba(240,198,98,0.10); }

.fold-difficulty {
  font-size: 18px;
  letter-spacing: 0.14em;
  color: var(--vermilion);
  font-family: "Share Tech Mono", monospace;
}

/* ────────── Diagram ────────── */
.diagram-wrap {
  margin-top: 8px;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: stretch;
}
.diagram {
  flex: 1 1 auto;
  height: 100%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
}
.diagram svg {
  width: 100%;
  height: 100%;
  max-height: 340px;
  display: block;
}
.diagram svg .paper {
  fill: var(--paper);
  stroke: var(--sumi);
  stroke-width: 2.5;
  stroke-linejoin: round;
}
.diagram svg .paper.back  { fill: var(--paper-back); }
.diagram svg .paper.shade { fill: var(--paper-shade); }
.diagram svg .paper.shade2 { fill: var(--paper-2); }
.diagram svg .crease {
  stroke: var(--crease);
  stroke-width: 1.6;
  stroke-dasharray: 2 3;
  fill: none;
}
.diagram svg .valley {
  stroke: var(--vermilion);
  stroke-width: 2.6;
  stroke-dasharray: 6 4;
  fill: none;
}
.diagram svg .mountain {
  stroke: var(--vermilion);
  stroke-width: 2.6;
  stroke-dasharray: 9 3 2 3;
  fill: none;
}
.diagram svg .arrow {
  fill: none;
  stroke: var(--vermilion);
  stroke-width: 2.6;
  stroke-linecap: round;
}
.diagram svg .arrow-head {
  fill: var(--vermilion);
  stroke: none;
}
.diagram svg .label {
  font-family: "Share Tech Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  fill: var(--ink-soft);
  text-anchor: middle;
}

.diagram.tick svg {
  animation: diagramPop 380ms cubic-bezier(0.2, 0.9, 0.3, 1.4);
}
@keyframes diagramPop {
  0%   { transform: translateY(-3px) scale(0.97); opacity: 0; }
  60%  { transform: translateY(0)    scale(1.02); opacity: 1; }
  100% { transform: translateY(0)    scale(1);    opacity: 1; }
}

/* ────────── Instruction ────────── */
.instruction {
  margin-top: 6px;
  font-family: "Cormorant Garamond", "Shippori Mincho", serif;
  font-size: 30px;
  line-height: 1.16;
  color: var(--paper);
  font-weight: 500;
  letter-spacing: 0.01em;
  text-align: right;
  min-height: 64px;
}
.instruction strong {
  color: var(--vermilion-hi);
  font-weight: 700;
}

/* ────────── Progress dots ────────── */
.progress-row {
  margin-top: 6px;
  display: flex;
  justify-content: flex-end;
}
.progress-dots {
  display: inline-flex;
  gap: 5px;
  align-items: center;
}
.progress-dots .dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: transparent;
  border: 1.5px solid var(--ink-dim);
  transition: background 120ms, transform 120ms;
}
.progress-dots .dot.done {
  background: var(--vermilion);
  border-color: var(--vermilion);
  box-shadow: 0 0 6px var(--vermilion-glow);
}
.progress-dots .dot.current {
  background: var(--paper);
  border-color: var(--paper);
  transform: scale(1.25);
  box-shadow: 0 0 8px rgba(243,231,200,0.5);
}

/* ────────── Hints footer ────────── */
.hints {
  margin-top: 10px;
  display: flex;
  justify-content: flex-end;
  gap: 18px;
  font-size: 17px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  text-transform: uppercase;
  font-family: "Share Tech Mono", monospace;
}
.hints .key {
  color: var(--vermilion);
  font-family: "Share Tech Mono", monospace;
  letter-spacing: 0;
  margin-right: 4px;
  font-size: 19px;
  font-weight: 700;
}

/* ────────── Done screen ────────── */
.done-stamp {
  margin: 14px 0 0 auto;
  width: 140px;
  height: 140px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.done-stamp-inner {
  width: 100%;
  height: 100%;
  border: 4px solid var(--vermilion);
  border-radius: 10px;
  background: rgba(255,90,72,0.10);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: rotate(-7deg);
  box-shadow: 0 0 0 1px rgba(255,90,72,0.4), 0 0 26px var(--vermilion-glow);
  position: relative;
}
.done-stamp-inner::after {
  content: '';
  position: absolute;
  inset: 5px;
  border: 1.5px dashed var(--vermilion);
  border-radius: 7px;
  opacity: 0.55;
}
.done-kanji {
  font-family: "Shippori Mincho", serif;
  font-size: 60px;
  font-weight: 700;
  color: var(--vermilion-hi);
  line-height: 1;
}
.done-label {
  font-family: "Shippori Mincho", serif;
  font-size: 18px;
  color: var(--vermilion);
  letter-spacing: 0.2em;
  margin-top: 4px;
}

.done-name {
  margin-top: 16px;
  font-family: "Cormorant Garamond", serif;
  font-size: 40px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.04em;
  line-height: 1;
}
.done-sub {
  margin-top: 4px;
  font-family: "Share Tech Mono", monospace;
  font-size: 16px;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
  text-transform: uppercase;
}

.done-actions {
  margin-top: 16px;
  display: flex;
  gap: 8px;
  align-items: stretch;
}

/* ────────── Buttons ────────── */
.btn {
  flex: 1 1 0;
  min-height: 62px;
  border-radius: 6px;
  border: 1.5px solid var(--ink-faint);
  background: transparent;
  color: var(--paper);
  font-family: "Share Tech Mono", monospace;
  font-size: 18px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: transform 80ms ease-out, border-color 120ms, color 120ms, box-shadow 120ms;
}
.btn:focus { outline: none; }
.btn.focused,
.btn:focus-visible {
  border-color: var(--vermilion);
  color: var(--vermilion-hi);
  box-shadow:
    0 0 0 1px var(--vermilion),
    0 0 22px var(--vermilion-faint);
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  border-color: var(--vermilion);
  background: rgba(255,90,72,0.12);
}
.btn-primary.focused {
  border-color: var(--vermilion-hi);
  color: #ffe7e0;
  box-shadow:
    0 0 0 1.5px var(--vermilion-hi),
    0 0 24px var(--vermilion-glow);
}
.btn-glyph {
  font-family: "Shippori Mincho", serif;
  font-size: 22px;
  letter-spacing: 0;
}

/* ────────── Status ────────── */
.status {
  position: absolute;
  right: var(--pad-r);
  bottom: 4px;
  font-family: "Share Tech Mono", monospace;
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 220ms ease-out;
  z-index: 20;
}
.status.show { opacity: 1; }

/* ────────── Animations ────────── */
.screen.shake {
  animation: paperShake 320ms ease-out;
}
@keyframes paperShake {
  0%   { transform: translateX(0); }
  25%  { transform: translateX(-2px); }
  50%  { transform: translateX(2px); }
  75%  { transform: translateX(-1px); }
  100% { transform: translateX(0); }
}