:root {
  --bg: #f4f5f7;
  --ink: #1b1e24;
  --muted: #5b6270;
  --card-bg: #ffffff;
  --card-border: #dde1e7;
  --accent: #2563eb;
  --accent-ink: #ffffff;
  --panel-dark: #20242c;
  --panel-dark-ink: #e7eaf0;
  --lcd-bg: #0d1f14;
  --lcd-ink: #57e389;
  --danger: #b3261e;
  --ok: #1a7f37;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --ink: #e7e9ee;
    --muted: #9aa1ad;
    --card-bg: #1d2027;
    --card-border: #2c313c;
    --accent: #5b8def;
    --accent-ink: #0b1020;
    --panel-dark: #101318;
    --panel-dark-ink: #e7eaf0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
}

.topbar {
  padding: 1.5rem 1.5rem 0.5rem;
  max-width: 60rem;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}
.topbar h1 { margin: 0 0 0.25rem; font-size: 1.6rem; }
.topbar p { margin: 0; color: var(--muted); }

.reset-btn {
  flex-shrink: 0;
  padding: 0.5rem 0.9rem;
  border-radius: 0.5rem;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--danger);
  font-size: 0.85rem;
  cursor: pointer;
}
.reset-btn:hover { background: var(--danger); color: #fff; border-color: var(--danger); }

@media (max-width: 32rem) {
  .topbar { flex-direction: column; }
}

.layout {
  max-width: 60rem;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 1.25rem;
}

@media (max-width: 44rem) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0.75rem;
  padding: 1.25rem;
}
.panel h2 { margin-top: 0; font-size: 1.05rem; }

.printer-panel {
  background: var(--panel-dark);
  color: var(--panel-dark-ink);
  border-color: transparent;
}

.cable-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem 0 0.6rem;
  margin-bottom: 0.25rem;
  color: var(--panel-dark-ink);
}
.cable-panel svg { color: #9aa1ad; }
.cable-label { font-size: 0.78rem; color: #b7bdc9; }

.lcd-frame {
  background: #171a1f;
  border: 1px solid #3a3f4a;
  border-radius: 0.5rem;
  padding: 0.6rem 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}

.power-led {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: #57e389;
  box-shadow: 0 0 5px #57e389;
  flex-shrink: 0;
}

.lcd {
  background: #c3d6c6;
  color: #17241a;
  font-family: "Courier New", monospace;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.4rem 0.6rem;
  border-radius: 0.15rem;
  flex: 1;
  line-height: 1.35;
}

.lcd-line {
  white-space: pre;
  overflow: hidden;
  height: 1.35em;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(3, minmax(3.2rem, auto));
  gap: 0.4rem;
  justify-content: center;
  margin-bottom: 1rem;
}
#key-menu { grid-column: 1; grid-row: 1; }
#key-up   { grid-column: 2; grid-row: 1; }
#key-back { grid-column: 3; grid-row: 1; }
#key-ok   { grid-column: 2; grid-row: 2; }
#key-down { grid-column: 2; grid-row: 3; }

.key {
  border: 1px solid #4a5060;
  background: #2b303a;
  color: var(--panel-dark-ink);
  padding: 0.5rem 0.4rem;
  border-radius: 0.4rem;
  cursor: pointer;
  font-size: 0.8rem;
}
.key:active { background: #3a4050; }
.key-arrow { font-size: 0.9rem; }
.key-ok {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}

.hint { font-size: 0.82rem; color: #b7bdc9; margin: 0; }

.tray-heading-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0;
}

.tray {
  min-height: 14rem;
  border: 1px dashed var(--card-border);
  border-radius: 0.5rem;
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: 1rem;
  margin: 0.75rem 0;
}

.tray-empty {
  margin: auto;
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
  max-width: 20rem;
}

.page-sheet {
  background: #fdfdfd;
  color: #111;
  width: 100%;
  border-radius: 0.15rem;
  box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.25);
  padding: 1rem 1.25rem;
}

.page-meta {
  font-size: 0.75rem;
  color: #666;
  border-bottom: 1px solid #ddd;
  padding-bottom: 0.4rem;
  margin-bottom: 0.6rem;
}

.page-text {
  font-family: "Courier New", monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
  min-height: 8rem;
}

.page-summary p {
  font-size: 0.85rem;
  color: #444;
  margin: 0 0 0.6rem;
}
.page-summary dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 0.75rem;
  font-size: 0.85rem;
  margin: 0;
}
.page-summary dt { color: #666; }
.page-summary dd { margin: 0; font-family: "Courier New", monospace; }

.countdown-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.countdown-bar {
  flex: 1;
  height: 0.35rem;
  background: var(--card-border);
  border-radius: 999px;
  overflow: hidden;
}
.countdown-fill {
  height: 100%;
  background: var(--accent);
  width: 100%;
  transition: width 1s linear;
}

.instructions {
  max-width: 60rem;
  margin: 0 auto 2rem;
}
.instructions ol { padding-left: 1.25rem; }
.instructions li { margin-bottom: 0.6rem; }