:root {
  --ink: #1c1917;
  --muted: #57534e;
  --faint: #78716c;
  --line: #d6d3d1;
  --line-strong: #a8a29e;
  --paper: #f5f4f1;
  --card: #fff;
  --accent: #0f5c56;
  --accent-hover: #0a433f;
  --mark: #b42318;
  --warn-bg: #faf6ee;
  --warn-ink: #6b4e16;
  --note-bg: #eef4f3;
  --fail-bg: #f8eeee;
  --font: "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  font-size: 15px;
}
body.is-hub,
body.is-done {
  height: auto;
  min-height: 100%;
  overflow: auto;
}
body.is-player {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
button, input { font-family: inherit; }

.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px 12px;
  border-bottom: 1px solid var(--ink);
  background: var(--card);
}
.brand {
  text-decoration: none;
  color: inherit;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.brand small {
  display: block;
  font-weight: 400;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0;
  margin-top: 2px;
}
.header-actions { display: flex; gap: 10px; align-items: center; font-size: 13px; }
.crumb { color: var(--muted); font-size: 13px; }

.btn {
  border: 1px solid var(--ink);
  background: var(--card);
  color: var(--ink);
  border-radius: 0;
  padding: 7px 14px;
  cursor: pointer;
  font-size: 13px;
}
.btn:hover { background: #f0efeb; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; }
.btn-text { border: 0; background: none; padding: 0; color: var(--accent); cursor: pointer; font-size: 13px; }
.search {
  width: 200px;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  background: transparent;
  padding: 6px 0;
  font-size: 13px;
  outline: none;
}

.wrap { max-width: 920px; margin: 0 auto; padding: 36px 24px 96px; }
.doc-kicker { font-size: 12px; letter-spacing: 0.16em; color: var(--muted); margin: 0 0 8px; }
.doc-title { font-size: 28px; font-weight: 700; letter-spacing: 0.04em; margin: 0 0 12px; line-height: 1.4; }
.lead { color: var(--muted); margin: 0 0 28px; max-width: 40em; }

.meta-table, .toc-table, .rule-table, .index-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 0 0 28px;
}
.meta-table th, .rule-table th, .toc-table th, .index-table th {
  text-align: left;
  font-weight: 500;
  background: #eceae4;
  border: 1px solid var(--line);
  padding: 8px 10px;
  width: 9.5em;
  vertical-align: top;
}
.meta-table td, .rule-table td, .toc-table td, .index-table td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  vertical-align: top;
}
.toc-table th, .index-table th { width: auto; }

h2.sec {
  font-size: 18px;
  margin: 40px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--ink);
  font-weight: 700;
  letter-spacing: 0.06em;
}
h3.sec { font-size: 15px; margin: 24px 0 8px; font-weight: 700; }

.how {
  border: 1px solid var(--line);
  background: var(--card);
  padding: 16px 18px;
  margin-bottom: 28px;
}
.how ol { margin: 8px 0 0; padding-left: 1.3em; }
.how li { margin: 4px 0; }

.resume-bar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  border: 1px solid var(--ink);
  background: var(--card);
  padding: 12px 16px;
  margin-bottom: 28px;
}

.chapter-list { margin: 0; padding: 0; list-style: none; }
.chapter-list li {
  display: grid;
  grid-template-columns: 5.5em 1fr auto;
  gap: 12px;
  align-items: start;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.chapter-list .no { font-size: 12px; color: var(--faint); letter-spacing: 0.08em; padding-top: 3px; }
.chapter-list h3 { margin: 0 0 4px; font-size: 16px; }
.chapter-list p { margin: 0; color: var(--muted); font-size: 13px; }
.chapter-list .ops { display: flex; gap: 8px; white-space: nowrap; padding-top: 2px; }
.prog { font-size: 12px; color: var(--faint); margin-top: 6px; }

.index-table a { color: inherit; text-decoration: none; }
.index-table tr:hover td { background: #f0efeb; }

.player {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 360px;
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}
@media (max-width: 1100px) {
  .player {
    grid-template-columns: 1fr;
    overflow: auto;
  }
  .rail {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    max-height: 200px;
  }
  .stage,
  .coach {
    min-height: 40vh;
  }
}

.rail {
  background: var(--card);
  border-right: 1px solid var(--line);
  padding: 16px 0 32px;
  overflow: auto;
  min-height: 0;
  overscroll-behavior: contain;
}
.rail .part {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--faint);
  padding: 0 16px 8px;
}
.rail ol { list-style: none; margin: 0; padding: 0; }
.rail button {
  width: 100%;
  text-align: left;
  border: 0;
  border-left: 3px solid transparent;
  background: none;
  padding: 8px 14px 8px 13px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.45;
  color: var(--ink);
}
.rail button:hover { background: #f0efeb; }
.rail button.is-current { border-left-color: var(--accent); background: var(--note-bg); font-weight: 500; }
.rail button.is-read { color: var(--muted); }
.rail button.is-unread .stitle-text { font-weight: 500; }
.rail .stitle {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}
.rail .stitle-text {
  flex: 1 1 auto;
  min-width: 0;
}
.rail .ssub {
  display: block;
  font-size: 11px;
  color: var(--faint);
  padding-left: 1.15em;
  margin-top: 2px;
}
.rail .status {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  margin-top: 3px;
  font-size: 0;
  overflow: hidden;
}
.rail .status::before {
  display: block;
  line-height: 1;
}
.rail .status-now::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--note-bg), 0 0 0 3px var(--accent);
}
.rail .status-read::before {
  content: "✓";
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
}
.rail .status-unread::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 1.5px solid var(--line-strong);
  box-sizing: border-box;
}

.stage {
  background: #eceae4;
  padding: 16px 18px 28px;
  overflow: auto;
  min-height: 0;
  overscroll-behavior: contain;
}
.stage-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 12px;
  color: var(--muted);
}
figure.shot {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--line-strong);
}
.shot-frame { position: relative; overflow: hidden; }
figure.shot img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: top;
}
figure.shot figcaption {
  border-top: 1px solid var(--line);
  padding: 8px 12px;
  font-size: 12px;
  color: var(--muted);
  background: #fafaf8;
}
.spot {
  position: absolute;
  box-sizing: content-box;
  border: 0;
  outline: 3px solid #c41e1e;
  outline-offset: 0;
  box-shadow: 0 0 0 9999px rgba(20, 18, 16, 0.45);
  pointer-events: none;
  z-index: 2;
}
.now-do {
  border: 1px solid var(--ink);
  background: #fff;
  padding: 14px 14px 12px;
  margin-bottom: 14px;
}
.now-do .kicker {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--faint);
  margin: 0 0 6px;
}
.now-do h1 {
  font-size: 20px;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
  line-height: 1.35;
}
.now-do .count {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 10px;
}
.progress-track {
  height: 3px;
  background: #e7e5e4;
  margin: 0 0 14px;
}
.progress-track > span {
  display: block;
  height: 100%;
  background: var(--accent);
}

.coach {
  background: var(--card);
  border-left: 1px solid var(--line);
  padding: 0;
  overflow: hidden;
  font-size: 14px;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
.coach-inner {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
}
.coach-scroll {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  padding: 18px 18px 12px;
  overscroll-behavior: contain;
}
.coach h1 {
  font-size: 18px;
  margin: 0 0 6px;
  letter-spacing: 0.04em;
  line-height: 1.4;
}
.coach .path { font-size: 12px; color: var(--faint); font-variant-numeric: tabular-nums; margin-bottom: 12px; }
.block { margin: 0 0 14px; }
.block h2 {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--faint);
  font-weight: 700;
  margin: 0 0 6px;
  border: 0;
  padding: 0;
}
.block p { margin: 0; }
.note {
  background: var(--note-bg);
  border-left: 3px solid var(--accent);
  padding: 8px 10px;
  margin: 0 0 14px;
  font-size: 13px;
}
.warn {
  background: var(--warn-bg);
  border-left: 3px solid #b45309;
  padding: 8px 10px;
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--warn-ink);
}
.fail {
  background: var(--fail-bg);
  border-left: 3px solid var(--mark);
  padding: 8px 10px;
  margin: 0 0 14px;
  font-size: 13px;
}

.marks { list-style: none; margin: 0 0 14px; padding: 0; }
.marks li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 8px;
  padding: 8px 6px;
  border-top: 1px solid var(--line);
  cursor: pointer;
}
.marks li:last-child { border-bottom: 1px solid var(--line); }
.marks li.is-active { background: #f8f1f0; }
.mark-n {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--mark);
  color: var(--mark);
  font-size: 12px;
  font-weight: 700;
  display: grid;
  place-items: center;
  margin-top: 1px;
}
.marks .label { font-weight: 700; font-size: 13px; }
.marks .body { font-size: 13px; color: var(--muted); margin-top: 2px; }

.nav-row { display: flex; gap: 8px; margin-top: 18px; }
.nav-row .btn { flex: 1; }
.coach-nav {
  flex: 0 0 auto;
  margin: 0;
  padding: 12px 18px 16px;
  border-top: 1px solid var(--line);
  background: var(--card);
}

.complete { max-width: 720px; }
.choice {
  display: block;
  width: 100%;
  text-align: left;
  margin: 6px 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: #fff;
  cursor: pointer;
  font-size: 14px;
}
.choice.is-right { border-color: var(--accent); background: var(--note-bg); }
.choice.is-wrong { border-color: #c24141; background: var(--fail-bg); }
.hidden { display: none !important; }

@media print {
  .app-header, .rail, .nav-row, .header-actions, .coach-nav { display: none; }
  .player { display: block; }
  .coach { border: 0; }
}