:root {
  --bg: #0b1224;
  --bg-alt: #0f1a33;
  --card: #111c38;
  --border: #1f2a48;
  --text: #e9efff;
  --muted: #9fb3d9;
  --accent: #7fc3ff;
  --accent-strong: #4da3ff;
  --shadow: 0 24px 60px rgba(0,0,0,0.35);
  --radius: 14px;
  --radius-sm: 10px;
  --transition: 0.18s ease;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at 20% 20%, rgba(79,124,255,0.08), transparent 25%),
              radial-gradient(circle at 80% 0%, rgba(111,231,255,0.06), transparent 22%),
              var(--bg);
  color: var(--text);
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: linear-gradient(90deg, rgba(15,26,51,0.8), rgba(17,28,56,0.92));
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(6px);
}

.brand { font-weight: 700; letter-spacing: 0.3px; }
.top-actions { display: flex; align-items: center; gap: 10px; }

/* Light mode text contrast for PASO links (viewer TOC) */
body:not(.dark-mode) .toc-cta { color: #0f1a2f; }
body:not(.dark-mode) .toc-link.level-1,
body:not(.dark-mode) .toc-link.level-2 { color: #0f1a2f; }
.top-actions input { padding: 8px 10px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--card); color: var(--text); }
.top-actions input:focus { outline: 1px solid var(--accent); }

.btn-outline, .btn-ghost {
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.btn-outline:hover, .btn-ghost:hover { background: var(--card); }
.btn-ghost { font-size: 1rem; line-height: 1; }

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 0;
  min-height: calc(100vh - 64px);
}

.sidebar {
  border-right: 1px solid var(--border);
  background: rgba(16,26,50,0.7);
  backdrop-filter: blur(6px);
  padding: 16px 14px;
  overflow-y: auto;
}
.sidebar-head h2 { margin: 4px 0 10px 0; }
.sidebar-head .eyebrow { color: var(--muted); margin: 0; font-size: 0.9rem; }

.manual-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.manual-list li { margin: 0; }
.manual-button {
  width: 100%;
  text-align: left;
  padding: 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border var(--transition), box-shadow var(--transition), transform var(--transition);
}
.manual-button:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-1px); }
.manual-button.active { border-color: var(--accent-strong); box-shadow: var(--shadow); }
.manual-title { margin: 0; font-weight: 700; }
.manual-desc { margin: 0; color: var(--muted); font-size: 0.95rem; }

.content-area { padding: 22px 24px; }
.doc-toolbar { display: flex; justify-content: space-between; gap: 16px; align-items: center; flex-wrap: wrap; }
.doc-toolbar h1 { margin: 4px 0; }
.doc-desc { margin: 4px 0; color: var(--muted); }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.78rem; color: var(--muted); }
.doc-actions { display: flex; gap: 8px; align-items: center; }
.doc-actions input { padding: 8px 10px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--card); color: var(--text); }
.doc-actions input:focus { outline: 1px solid var(--accent); }
.doc-actions button { padding: 8px 10px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--card); color: var(--text); cursor: pointer; }
.doc-actions button:hover { border-color: var(--accent); }

.doc-layout { display: grid; grid-template-columns: 1fr 280px; gap: 16px; align-items: start; }
.doc-content {
  background: rgba(17,28,56,0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  line-height: 1.55;
  overflow: auto;
  min-height: 60vh;
}
.doc-content h1, .doc-content h2, .doc-content h3, .doc-content h4, .doc-content h5, .doc-content h6 { margin: 14px 0 10px 0; }
.doc-content h1, .doc-content h2, .doc-content h3, .doc-content h4, .doc-content h5, .doc-content h6 { scroll-margin-top: 52px; }
.doc-content p { margin: 10px 0; }
.doc-content pre { background: #0c1428; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px; overflow: auto; }
.doc-content code { background: #0c1428; padding: 2px 4px; border-radius: 6px; border: 1px solid var(--border); }
.doc-content ul { padding-left: 20px; }
.doc-content blockquote { border-left: 3px solid var(--accent); padding-left: 10px; color: var(--muted); margin: 10px 0; }

.toc {
  position: sticky;
  top: 78px;
  background: rgba(17,28,56,0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  max-height: calc(100vh - 120px);
  overflow: auto;
  box-shadow: var(--shadow);
}
.toc-head { display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.toc-head input { padding: 7px 10px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--card); color: var(--text); }
.toc-list { display: flex; flex-direction: column; gap: 4px; }
.toc-item { display: flex; flex-direction: column; gap: 6px; }
.toc-link { width: 100%; text-align: left; padding: 6px 10px; border-radius: var(--radius-sm); border: 1px solid transparent; background: transparent; color: var(--text); }
.toc-link.level-1 { font-weight: 800; cursor: pointer; }
.toc-link.level-2 { padding-left: 10px; font-weight: 700; cursor: pointer; }
.toc-link.level-3 { padding-left: 18px; font-weight: 600; cursor: default; }
.toc-link.level-4 { padding-left: 24px; cursor: default; }
.toc-link.level-1:hover,
.toc-link.level-2:hover { border-color: var(--accent); box-shadow: 0 0 16px rgba(124, 244, 224, 0.55); }
.toc-disabled { color: var(--muted); border-color: transparent; background: transparent; box-shadow: none; }

.toc-cta {
  border: 1px solid rgba(79, 124, 244, 0.85);
  background: linear-gradient(135deg, rgba(79,124,244,0.35), rgba(124,244,224,0.24));
  box-shadow: 0 12px 26px rgba(79,124,244,0.22), 0 0 24px rgba(124,244,224,0.32);
  color: #e8f0ff;
  transition: transform 0.16s ease, box-shadow 0.16s ease, border 0.16s ease, background 0.16s ease;
}

.toc-cta:hover {
  transform: translateY(-1px);
  border-color: rgba(124, 244, 224, 0.75);
  box-shadow: 0 16px 32px rgba(79,124,244,0.3), 0 0 26px rgba(124,244,224,0.4);
  background: linear-gradient(135deg, rgba(79,124,244,0.45), rgba(124,244,224,0.32));
}

.toc-disabled:hover { border-color: transparent; box-shadow: none; }
.badge-soft { display: inline-flex; padding: 4px 8px; border-radius: 999px; border: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; }

.highlight { background: rgba(127,195,255,0.18); border-radius: 6px; }

@media (max-width: 1080px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: fixed; inset: 64px auto 0 0; width: 280px; transform: translateX(0); transition: transform var(--transition); z-index: 20; }
  .sidebar.hidden { transform: translateX(-100%); }
  .content-area { padding: 18px; }
  .doc-layout { grid-template-columns: 1fr; }
  .toc { position: relative; top: auto; max-height: none; }
}

@media (max-width: 640px) {
  .doc-actions { width: 100%; flex-wrap: wrap; }
  .doc-actions input { flex: 1; min-width: 160px; }
  .top-actions input { display: none; }
  .doc-toolbar { flex-direction: column; align-items: flex-start; }
}