:root {
  --bg: #0b0f14;
  --panel: #121922;
  --panel2: #18212c;
  --line: #243142;
  --text: #d8e2ec;
  --dim: #7d8ea1;
  --accent: #ffb347;
  --green: #5ef0a0;
  --red: #ff6b6b;
  --mono: "Consolas", "SFMono-Regular", "Menlo", monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  background-image: repeating-linear-gradient(0deg, rgba(255,255,255,.015) 0 1px, transparent 1px 3px);
  color: var(--text);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  line-height: 1.7;
  min-height: 100vh;
}
button { font: inherit; cursor: pointer; }
button:disabled { cursor: not-allowed; }

.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 16px 24px; border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 32px; }
h1 { margin: 0; font-size: 22px; letter-spacing: .05em; }
h1 span { color: var(--accent); margin-left: 6px; font-family: var(--mono); font-size: .8em; }
.sub { margin: 0; color: var(--dim); font-size: 13px; }
.top-actions { display: flex; gap: 8px; }

.primary {
  background: var(--accent); color: #1a1206; border: 0; border-radius: 8px;
  padding: 9px 16px; font-weight: 700;
}
.primary:hover { filter: brightness(1.08); }
.ghost {
  background: transparent; color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 12px;
}
.ghost:hover { border-color: var(--accent); color: var(--accent); }
.small { padding: 4px 10px; font-size: 13px; }

.stages { display: flex; gap: 8px; padding: 14px 24px; overflow-x: auto; }
.stage-pill {
  flex: 0 0 auto; width: 40px; height: 40px; border-radius: 50%;
  background: var(--panel); color: var(--text); border: 1px solid var(--line);
  font-family: var(--mono); font-weight: 700;
}
.stage-pill.done { color: var(--green); border-color: rgba(94,240,160,.4); }
.stage-pill.active { border: 2px solid var(--accent); color: var(--accent); }
.stage-pill:disabled { opacity: .45; }

.layout {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px; padding: 4px 24px 24px; align-items: start;
}
.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 20px;
}
.bench { position: sticky; top: 12px; }

.mission-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.mission-head h2 { margin: 0; font-size: 20px; }
.stage-no { font-family: var(--mono); color: var(--accent); font-weight: 700; }
.tag {
  font-family: var(--mono); font-size: 11px; color: var(--dim);
  border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px;
}
.story { color: #c3cfdb; }
.meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.meta span {
  font-family: var(--mono); font-size: 12px; background: var(--panel2);
  border: 1px solid var(--line); border-radius: 6px; padding: 2px 8px; color: var(--green);
}

.fragment {
  background: #070a0e; border: 1px solid var(--line); border-radius: 10px; margin-bottom: 12px; overflow: hidden;
}
.frag-head {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  padding: 6px 10px; border-bottom: 1px solid var(--line); font-size: 13px; color: var(--dim);
}
.fragment pre {
  margin: 0; padding: 12px; font-family: var(--mono); font-size: 14px; color: var(--green);
  white-space: pre-wrap; word-break: break-all; text-shadow: 0 0 6px rgba(94,240,160,.35);
}
.invisible-ink { color: var(--panel); font-family: var(--mono); font-size: 13px; user-select: text; }
::selection { background: var(--accent); color: #1a1206; }

.answer { margin-top: 18px; }
.answer label { font-size: 13px; color: var(--dim); }
.answer-row { display: flex; gap: 8px; }
.answer-row input {
  flex: 1; min-width: 0; background: #070a0e; color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 9px 12px; font-family: var(--mono); font-size: 16px;
}
.answer-row input:focus, textarea:focus, .param input[type=text]:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.feedback { min-height: 1.7em; margin: 6px 0 0; font-weight: 700; }
.feedback.ok { color: var(--green); }
.feedback.ng { color: var(--red); }
.shake { animation: shake .35s; }
@keyframes shake { 20%,60% { transform: translateX(-6px); } 40%,80% { transform: translateX(6px); } }

.hints { margin-top: 10px; }
.hints ol { padding-left: 1.4em; margin: 8px 0 0; color: #c3cfdb; font-size: 14px; }
.hints li.spoiler { color: var(--accent); }

.bench-head { display: flex; justify-content: space-between; align-items: center; }
.bench-head h2 { margin: 0; font-size: 18px; }
.bench-btns { display: flex; gap: 6px; }
.lbl { display: block; font-size: 13px; color: var(--dim); margin: 10px 0 4px; }
textarea {
  width: 100%; min-height: 110px; resize: vertical; background: #070a0e; color: var(--text);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px; font-family: var(--mono); font-size: 14px;
  word-break: break-all;
}
#benchOut { color: var(--green); }
#benchOut.err { color: var(--red); }
.tools { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.tool {
  background: var(--panel2); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; font-size: 13px;
}
.tool:hover { border-color: var(--accent); }
.tool.active { background: var(--accent); color: #1a1206; border-color: var(--accent); font-weight: 700; }
.params { margin-top: 10px; }
.param { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.param input[type=range] { flex: 1; accent-color: var(--accent); min-width: 0; }
.param output { font-family: var(--mono); color: var(--accent); width: 3em; text-align: center; font-weight: 700; }
.param input[type=text] {
  flex: 1; min-width: 0; background: #070a0e; color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; font-family: var(--mono); text-transform: uppercase;
}
.out-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.chain { font-family: var(--mono); font-size: 12px; color: var(--accent); text-align: right; }
.out-btns { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }

.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,.65); display: grid; place-items: center; padding: 16px; z-index: 10;
}
.modal[hidden] { display: none; }
.modal-card {
  position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 24px; width: min(560px, 100%); max-height: 85vh; overflow: auto;
}
.modal-card h2 { margin-top: 0; }
.modal-card.center { text-align: center; }
.close { position: absolute; top: 10px; right: 12px; background: none; border: 0; color: var(--dim); font-size: 24px; }
details { border-bottom: 1px solid var(--line); padding: 8px 0; }
summary { cursor: pointer; font-weight: 700; }
details p { margin: 6px 0 0; color: #c3cfdb; font-size: 14px; }
.stamp {
  display: inline-block; font-family: var(--mono); font-weight: 900; font-size: 28px; letter-spacing: .15em;
  color: var(--green); border: 3px solid var(--green); padding: 4px 16px; transform: rotate(-6deg);
  animation: stamp .4s cubic-bezier(.2,1.6,.4,1);
}
@keyframes stamp { from { transform: rotate(-6deg) scale(2.2); opacity: 0; } }

.foot { text-align: center; color: var(--dim); font-size: 12px; padding: 12px 16px 28px; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding: 4px 16px 16px; }
  .top, .stages { padding-left: 16px; padding-right: 16px; }
  .bench { position: static; }
  .sub { display: none; }
}