* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root {
  --bg: #0e1512;
  --pitch: #1a3325;
  --pitch-line: #2a4a37;
  --ink: #e8f0ea;
  --dim: #9ab3a3;
  --accent: #ffd54a;
  --clear: #4ade80;
  --blocked: #f87171;
  --panel: #16211b;
}

html, body {
  height: 100%;
  user-select: none;
  -webkit-user-select: none;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
  overscroll-behavior: none;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  padding: 8px 8px 16px;
}

header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 6px 4px 8px;
}
header h1 { font-size: 18px; letter-spacing: 2px; font-weight: 800; }
header h1 span { color: var(--accent); }
#hud { display: flex; gap: 14px; margin-left: auto; font-size: 13px; color: var(--dim); }
#hud b { color: var(--ink); font-size: 15px; }
#gear {
  background: none; border: 1px solid #33493d; color: var(--dim);
  border-radius: 8px; padding: 4px 10px; font-size: 14px; cursor: pointer;
}

#puzzle-title { font-size: 12px; color: var(--dim); padding: 0 4px 6px; min-height: 18px; }

#board-wrap { position: relative; }
svg#board { width: 100%; height: auto; display: block; border-radius: 12px; touch-action: none; }

#toolbar {
  display: flex; gap: 8px; padding: 10px 2px;
}
#toolbar button {
  flex: 1;
  background: var(--panel); color: var(--ink);
  border: 1px solid #33493d; border-radius: 10px;
  padding: 10px 0; font-size: 14px; font-weight: 700; letter-spacing: 1px;
  cursor: pointer;
}
#toolbar button:active { background: #223428; }
#toolbar button.warn { color: var(--blocked); }

#panel {
  background: var(--panel); border: 1px solid #2a3f32; border-radius: 12px;
  padding: 12px; margin-top: 4px; font-size: 13px;
  display: none;
}
#panel.open { display: block; }
#panel h3 { font-size: 12px; color: var(--accent); letter-spacing: 1px; margin: 10px 0 6px; }
#panel h3:first-child { margin-top: 0; }
.row { display: flex; align-items: center; gap: 8px; margin: 6px 0; flex-wrap: wrap; }
.row label { color: var(--dim); min-width: 108px; }
.row output { color: var(--ink); font-weight: 700; min-width: 36px; }
.row select, .row input[type=text] {
  background: #0f1813; color: var(--ink); border: 1px solid #33493d;
  border-radius: 6px; padding: 5px 8px; font-size: 13px; flex: 1;
}
.row input[type=range] { flex: 1; accent-color: var(--accent); }
.row button, #editor-tools button {
  background: #0f1813; color: var(--ink); border: 1px solid #33493d;
  border-radius: 8px; padding: 6px 10px; font-size: 12px; cursor: pointer;
}
#editor-tools button.active { border-color: var(--accent); color: var(--accent); }
.row .chk { display: flex; align-items: center; gap: 4px; color: var(--dim); }
textarea#json {
  user-select: text; -webkit-user-select: text;
  width: 100%; height: 110px; background: #0f1813; color: var(--ink);
  border: 1px solid #33493d; border-radius: 8px; padding: 8px;
  font-family: ui-monospace, monospace; font-size: 11px; margin-top: 6px;
}
#solve-out { color: var(--accent); font-weight: 700; }
#msg {
  min-height: 20px; font-size: 13px; color: var(--accent);
  padding: 2px 4px; text-align: center;
}

#overlay {
  position: fixed; inset: 0; background: rgba(5, 10, 7, 0.82);
  display: none; align-items: center; justify-content: center; z-index: 50;
}
#overlay.open { display: flex; }
#overlay .card {
  background: var(--panel); border: 1px solid #3a553f; border-radius: 16px;
  padding: 28px 32px; text-align: center; max-width: 320px;
}
#overlay .card h2 { font-size: 30px; letter-spacing: 3px; color: var(--clear); margin-bottom: 8px; }
#overlay .card h2.fail { color: var(--blocked); }
#overlay .card p { color: var(--ink); font-size: 15px; margin: 6px 0; white-space: pre-line; }
#overlay .card .sub { color: var(--dim); font-size: 12px; }
#overlay .card button {
  margin: 12px 6px 0; background: #0f1813; color: var(--ink);
  border: 1px solid #33493d; border-radius: 10px; padding: 10px 16px;
  font-size: 14px; cursor: pointer;
}

.flash-line { animation: flashLine 1.1s ease-out forwards; }
@keyframes flashLine {
  0% { opacity: 0; stroke-width: 10; }
  25% { opacity: 1; }
  100% { opacity: 0; stroke-width: 3; }
}