:root {
  --bg: #14110e;
  --bg-2: #1c1814;
  --paper: #221d18;
  --ink: #efe6d6;
  --muted: #9a8f7e;
  --line: #3a332b;
  --amber: #e0a45a;
  --amber-dim: #8a6230;
  --good: #8fbf88;
  --warn: #d47a5a;
  --mono: "IBM Plex Mono", "ui-monospace", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
html { font-size: 19px; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.rail {
  border-right: 1px solid var(--line);
  background: var(--bg-2);
  padding: 28px 20px 40px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
}

.mark {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}
.rail h1 {
  font-size: 26px;
  font-weight: 600;
  margin: 8px 0 6px;
}
.rail .tag {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 22px;
}

.progress-track {
  height: 4px;
  background: var(--line);
  margin: 0 0 8px;
}
.progress-fill {
  height: 4px;
  background: var(--amber);
  width: 0%;
}
.progress-label {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 16px;
}

.nav-group {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-dim);
  margin: 16px 0 8px;
}

.nav-item {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  color: var(--muted);
  padding: 8px 8px;
  font: 15px/1.35 var(--sans);
  cursor: pointer;
  border-left: 2px solid transparent;
}
.nav-item:hover { color: var(--ink); }
.nav-item.current {
  color: var(--ink);
  border-left-color: var(--amber);
  background: rgba(224, 164, 90, 0.06);
}
.nav-item.done { color: var(--good); }
.nav-item:disabled { opacity: 0.35; cursor: not-allowed; }

.step-drawer { margin-top: 8px; }
.step-drawer summary {
  cursor: pointer;
  color: var(--amber);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.stage {
  padding: 40px 56px 96px;
  max-width: 820px;
}

.kicker {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 10px;
}
h2.step-title {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  line-height: 1.2;
}

.prose p { margin: 0 0 14px; color: #e8ddcc; }
.prose ul { margin: 0 0 16px; padding-left: 1.2em; color: #e8ddcc; }
.prose li { margin-bottom: 8px; }
.prose strong { color: #fff8ea; font-weight: 600; }
.prose a { color: var(--amber); }

.callout {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 14px 16px;
  margin: 18px 0;
  font-size: 1rem;
}
.callout.warn { border-color: #6a3d30; }
.callout .label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 6px;
}

.cmd {
  font-family: var(--mono);
  font-size: 15px;
  background: #0e0c0a;
  border: 1px solid var(--line);
  padding: 14px 16px;
  margin: 0;
  white-space: pre-wrap;
  color: #f0d9a8;
  line-height: 1.45;
}

.copy-block { margin: 18px 0; }
.copy-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.copy-bar .label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
}

label.field {
  display: block;
  font-size: 15px;
  color: var(--muted);
  margin: 14px 0 6px;
}
textarea {
  width: 100%;
  background: #0e0c0a;
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 14px;
  font: 1.05rem/1.45 var(--sans);
  min-height: 160px;
  resize: vertical;
}
textarea:focus {
  outline: none;
  border-color: var(--amber-dim);
}

.hint {
  font-size: 15px;
  color: var(--muted);
  margin-top: 8px;
}
.hint.bad { color: var(--warn); }
.hint.good { color: var(--good); }

.actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 22px;
}
button.btn {
  font-family: var(--sans);
  font-size: 1.05rem;
  border: 1px solid var(--amber-dim);
  background: transparent;
  color: var(--ink);
  padding: 14px 18px;
  min-height: 56px;
  cursor: pointer;
}
button.btn.primary {
  background: var(--amber);
  border-color: var(--amber);
  color: #1a140c;
  font-weight: 600;
}
button.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
button.btn.ghost { border-color: var(--line); color: var(--muted); }
button.btn.big { width: 100%; }
button.btn.warn {
  border-color: #6a3d30;
  color: var(--warn);
}

.mod-card, .unit {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  text-align: left;
  background: var(--paper);
  border: 1px solid var(--line);
  color: inherit;
  padding: 16px 16px;
  margin: 0 0 12px;
  cursor: pointer;
  font: inherit;
}
.mod-card:hover, .unit:hover, .mod-card:focus-visible, .unit:focus-visible {
  border-color: var(--amber-dim);
  outline: none;
}
.mod-card h3, .unit .t {
  margin: 0 0 4px;
  font-size: 1.25rem;
  font-weight: 600;
}
.mod-card p, .unit .s {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}
.unit .score {
  font-weight: 600;
  color: var(--amber);
  white-space: nowrap;
}
.mini {
  height: 6px;
  background: var(--line);
  margin-top: 8px;
  max-width: 280px;
}
.mini > span, .bar > span {
  display: block;
  height: 100%;
  background: var(--amber);
}
.bar {
  height: 8px;
  background: var(--line);
  margin: 8px 0 4px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.95rem;
}
.badge {
  display: inline-block;
  border: 1px solid var(--amber-dim);
  color: var(--amber);
  padding: 2px 8px;
  font-size: 0.8rem;
  font-weight: 600;
}
.badge.apply {
  color: #d7c6f0;
  border-color: #6a5a9c;
}

.q {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 8px 0 18px;
  line-height: 1.4;
}
.opts { display: grid; gap: 10px; }
.opt {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  text-align: left;
  font: inherit;
  font-size: 1.05rem;
  background: #0e0c0a;
  border: 2px solid var(--line);
  color: inherit;
  padding: 14px 16px;
  cursor: pointer;
  width: 100%;
  min-height: 56px;
}
.opt:hover:not(:disabled) { border-color: var(--amber-dim); }
.opt .n {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #2a241c;
  color: var(--amber);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}
.opt.correct { border-color: var(--good); background: #1a2a1c; }
.opt.wrong { border-color: var(--warn); background: #2a1a16; }
.opt:disabled { cursor: default; }

.fb {
  margin-top: 18px;
  border: 1px solid var(--line);
  padding: 16px 18px;
}
.fb.ok { background: #1a2a1c; border-color: #3d6b45; }
.fb.bad { background: #2a1a16; border-color: #6a3d30; }
.fb.neutral { background: var(--paper); }
.fb .head { font-weight: 600; font-size: 1.1rem; margin-bottom: 6px; }
.fb.ok .head { color: var(--good); }
.fb.bad .head { color: var(--warn); }
.src { margin-top: 12px; font-size: 0.95rem; color: var(--muted); }
.src .tag {
  display: inline-block;
  border: 1px solid var(--line);
  color: var(--amber);
  font-weight: 600;
  padding: 1px 8px;
  margin-right: 6px;
}
blockquote {
  margin: 8px 0 0;
  padding: 8px 12px;
  border-left: 4px solid var(--amber);
  background: rgba(0, 0, 0, 0.2);
  color: #e8ddcc;
  font-size: 0.95rem;
}
.model {
  background: #0e0c0a;
  border: 1px solid var(--line);
  padding: 12px 14px;
  margin: 8px 0 10px;
}
ul.points { margin: 6px 0 0; padding-left: 1.2em; }
ul.points li { margin-bottom: 6px; }
.row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.kbd {
  display: inline-block;
  min-width: 1.4em;
  padding: 0 0.35em;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  font-family: var(--mono);
  font-size: 0.75rem;
  text-align: center;
  color: var(--muted);
}
.big-score {
  font-size: 2.8rem;
  font-weight: 600;
  color: var(--amber);
  margin: 6px 0;
}
.passed .medal { font-size: 2.4rem; line-height: 1; }
.miss-list { margin: 8px 0 0; padding-left: 1.2em; color: var(--muted); }
.miss-list li { margin-bottom: 6px; }

@media (max-width: 860px) {
  html { font-size: 18px; }
  .app { grid-template-columns: 1fr; }
  .rail {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 12px 16px 8px;
  }
  .rail h1 { font-size: 22px; margin: 4px 0; }
  .rail .tag { margin-bottom: 8px; }
  .progress-label { margin-bottom: 6px; }
  .stage { padding: 16px 16px 72px; }
  h2.step-title { font-size: 1.65rem; }
  textarea { min-height: 120px; }
}
@media (max-width: 420px) {
  .rail h1 { font-size: 22px; }
  .unit { align-items: flex-start; }
}