:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.4);
  --radius-md: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  width: 600px; height: 600px; overflow: hidden;
  background: #000;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}
#app { width: 100%; height: 100%; position: relative; }
.screen { width: 100%; height: 100%; position: absolute; top: 0; left: 0; display: flex; flex-direction: column; }
.screen.hidden { display: none; }
.focusable { transition: all 0.15s ease; border: 2px solid transparent; cursor: pointer; outline: none; }
.focusable:focus { border-color: var(--focus-ring); box-shadow: 0 0 20px var(--focus-glow); }
.hidden { display: none !important; }

/* ---------- header / footer ---------- */
.hdr {
  padding: 18px 22px 14px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--bg-tertiary);
  flex-shrink: 0;
}
.hdr-row { display: flex; align-items: center; gap: 14px; }
.hdr-title { font-size: 26px; font-weight: 700; letter-spacing: 0.3px; }
.hdr-sub { font-size: 15px; color: var(--text-secondary); margin-top: 4px; }
.hdr-spacer { flex: 1; }
.back {
  width: 52px; height: 52px; flex-shrink: 0;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 22px; line-height: 1;
  display: flex; align-items: center; justify-content: center;
}
.foot {
  flex-shrink: 0;
  padding: 12px 22px;
  font-size: 13px; color: var(--text-muted);
  text-align: center;
  border-top: 1px solid var(--bg-tertiary);
}

/* ---------- body ---------- */
.body { flex: 1; padding: 20px 22px; overflow-y: auto; }

/* ---------- home menu ---------- */
.menu { display: flex; flex-direction: column; gap: 14px; }
.tile {
  display: flex; align-items: center; gap: 18px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  min-height: 88px;
  text-align: left;
  color: var(--text-primary);
}
.tile-ico {
  width: 60px; height: 56px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-tertiary);
  border-radius: 10px;
  font-size: 20px; font-weight: 700;
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.tile-txt { display: flex; flex-direction: column; gap: 4px; }
.tile-name { font-size: 21px; font-weight: 600; }
.tile-desc { font-size: 15px; color: var(--text-secondary); }
.menu-row { display: flex; gap: 14px; }
.tile-sm {
  flex: 1; min-height: 70px; justify-content: center;
}
.tile-sm .tile-name { font-size: 19px; }

/* ---------- input / buffer ---------- */
.buffer-wrap { flex-shrink: 0; padding: 14px 22px 8px; }
.buffer {
  background: var(--bg-secondary);
  border: 1px solid var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  min-height: 84px;
  max-height: 120px;
  overflow-y: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 19px;
  line-height: 1.5;
  color: var(--text-primary);
  word-break: break-all;
  white-space: pre-wrap;
}
.buffer.empty { color: var(--text-muted); }
.caret {
  display: inline-block;
  width: 2px; height: 1.05em;
  background: var(--accent);
  vertical-align: text-bottom;
  margin-left: 1px;
  animation: blink 1.1s steps(2, start) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- keyboard ---------- */
.kb {
  flex: 1;
  display: flex; flex-wrap: wrap;
  align-content: flex-start;
  gap: 6px;
  padding: 6px 22px;
  overflow-y: auto;
}
.key {
  width: 50px; height: 46px;
  border-radius: 9px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 19px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  display: flex; align-items: center; justify-content: center;
}
.kb-actions {
  flex-shrink: 0;
  display: flex; gap: 6px;
  padding: 8px 22px 16px;
}
.kb-actions .key { height: 56px; flex: 1; font-size: 16px; font-weight: 600; }
.key-fn { background: var(--bg-secondary); color: var(--text-secondary); }
.key-wide { flex: 2 !important; }
.key-run { background: var(--accent); color: #04222b; font-weight: 700; }
.key.shift-on { background: var(--accent-secondary); color: #04261a; }

/* ---------- result ---------- */
.result-box {
  background: var(--bg-secondary);
  border: 1px solid var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 18px;
  line-height: 1.55;
  color: var(--text-primary);
  word-break: break-all;
  white-space: pre-wrap;
}
.result-box.error { color: var(--danger); border-color: var(--danger); }
.res-label { color: var(--text-muted); font-size: 13px; margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.6px; }
.kv { display: flex; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--bg-tertiary); }
.kv:last-child { border-bottom: none; }
.kv-k { color: var(--accent); min-width: 92px; flex-shrink: 0; }
.kv-v { color: var(--text-primary); word-break: break-all; }
.kv-v.muted { color: var(--text-muted); }
.qp-head { color: var(--accent-secondary); font-size: 13px; margin: 14px 0 4px; text-transform: uppercase; letter-spacing: 0.6px; }

/* ---------- bottom bar ---------- */
.bar {
  flex-shrink: 0;
  display: flex; gap: 10px;
  padding: 14px 22px 18px;
  border-top: 1px solid var(--bg-tertiary);
}
.btn {
  flex: 1; min-height: 56px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 17px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
}
.btn-home { background: var(--accent); color: #04222b; }

/* ---------- history ---------- */
.hist-list { display: flex; flex-direction: column; gap: 12px; }
.hist-item {
  display: flex; align-items: center; gap: 14px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  min-height: 72px;
  text-align: left;
  color: var(--text-primary);
}
.hist-tag {
  flex-shrink: 0;
  font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.5px;
  padding: 6px 10px; border-radius: 8px;
  background: var(--bg-tertiary); color: var(--accent);
}
.hist-txt {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 16px; color: var(--text-secondary);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.empty-state {
  color: var(--text-muted); font-size: 17px;
  text-align: center; padding: 60px 20px;
}

/* ---------- help ---------- */
.help-body p { margin-bottom: 16px; font-size: 17px; line-height: 1.55; color: var(--text-secondary); }
.help-body b { color: var(--text-primary); }
.help-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--bg-tertiary); color: var(--accent);
  padding: 2px 6px; border-radius: 5px; font-size: 15px;
}

/* ---------- toast ---------- */
.toast {
  position: absolute; bottom: 88px; left: 50%;
  transform: translateX(-50%);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--accent);
  padding: 12px 22px; border-radius: 24px;
  font-size: 16px; font-weight: 600;
  z-index: 50;
}