/* tutorial styling — system fonts, no external deps, works offline (file://) */

:root {
  --bg: #ffffff;
  --bg-soft: #f5f5f7;
  --bg-code: #1d1d1f;
  --text: #1d1d1f;
  --text-soft: #6e6e73;
  --border: #d2d2d7;
  --accent: #0066cc;
  --accent-soft: #e8f1fc;
  --warn-bg: #fff4e5;
  --warn-border: #f0a020;
  --ok-bg: #e8f7ed;
  --ok-border: #34a853;
  --err-bg: #fdecea;
  --err-border: #d93025;
  --code-fg: #f5f5f7;
  --code-comment: #8ad;
  --code-string: #ffd17a;
  --code-keyword: #f97583;
  --code-fn: #b392f0;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text",
               "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.6;
}

/* ── Layout ─────────────────────────────────────────────────── */

.layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; }
}

.sidebar {
  background: var(--bg-soft);
  border-right: 1px solid var(--border);
  padding: 32px 24px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar h1 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 4px 0;
  color: var(--text);
}

.sidebar .tagline {
  font-size: 12px;
  color: var(--text-soft);
  margin-bottom: 24px;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar nav a {
  text-decoration: none;
  color: var(--text);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 14px;
  display: block;
}

.sidebar nav a:hover {
  background: rgba(0, 0, 0, 0.05);
}

.sidebar nav a.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.sidebar nav .section {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-soft);
  margin: 16px 10px 4px 10px;
  font-weight: 600;
}

.content {
  padding: 48px 64px;
  max-width: 920px;
}

@media (max-width: 700px) {
  .content { padding: 24px; }
}

/* ── Typography ─────────────────────────────────────────────── */

h1, h2, h3, h4 {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display",
               "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-top: 1.6em;
  margin-bottom: 0.5em;
}

h1 {
  font-size: 36px;
  margin-top: 0;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 26px;
  padding-top: 0.5em;
  border-top: 1px solid var(--border);
  margin-top: 2em;
}

h2:first-of-type {
  border-top: none;
  margin-top: 1em;
}

h3 { font-size: 19px; }
h4 { font-size: 16px; color: var(--text-soft); }

p { margin: 0.6em 0 1em 0; }

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

a:hover { text-decoration: underline; }

.lead {
  font-size: 18px;
  color: var(--text-soft);
  margin-bottom: 2em;
}

/* ── Code ───────────────────────────────────────────────────── */

code {
  font-family: "SF Mono", Menlo, Monaco, "Cascadia Code", Consolas, monospace;
  font-size: 0.9em;
  background: var(--bg-soft);
  padding: 2px 6px;
  border-radius: 4px;
  color: #c41a16;
}

pre {
  background: var(--bg-code);
  color: var(--code-fg);
  padding: 16px 20px;
  border-radius: 10px;
  overflow-x: auto;
  font-family: "SF Mono", Menlo, Monaco, "Cascadia Code", Consolas, monospace;
  font-size: 13.5px;
  line-height: 1.55;
  margin: 1em 0;
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* simple heuristic-only "highlighting" via spans */
pre .c { color: var(--code-comment); font-style: italic; }
pre .s { color: var(--code-string); }
pre .k { color: var(--code-keyword); font-weight: 600; }
pre .f { color: var(--code-fn); }

.lang-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-soft);
  background: var(--bg-soft);
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: -8px;
  margin-top: 1em;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lang-tag + pre {
  margin-top: 4px;
  border-top-left-radius: 0;
}

/* ── Tables ─────────────────────────────────────────────────── */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 14px;
}

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  background: var(--bg-soft);
  font-weight: 600;
  font-size: 13px;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

tbody tr:hover { background: var(--bg-soft); }

td code { white-space: nowrap; }

/* ── Callouts ───────────────────────────────────────────────── */

.callout {
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  padding: 12px 16px;
  margin: 1.2em 0;
  border-radius: 6px;
  font-size: 14.5px;
}

.callout.warn {
  border-left-color: var(--warn-border);
  background: var(--warn-bg);
}

.callout.ok {
  border-left-color: var(--ok-border);
  background: var(--ok-bg);
}

.callout.err {
  border-left-color: var(--err-border);
  background: var(--err-bg);
}

.callout strong:first-child { display: block; margin-bottom: 4px; }

/* ── Step list ──────────────────────────────────────────────── */

.steps {
  list-style: none;
  padding: 0;
  counter-reset: step;
}

.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 56px;
  margin-bottom: 28px;
  min-height: 36px;
}

.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: -2px;
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}

.steps > li > h3 {
  margin: 0 0 6px 0;
  font-size: 17px;
}

/* ── Cards (used on index) ──────────────────────────────────── */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 2em 0;
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  background: white;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  display: block;
}

.card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 6px 0;
  font-size: 16px;
  color: var(--accent);
}

.card p {
  margin: 0;
  color: var(--text-soft);
  font-size: 14px;
}

.card .badge {
  display: inline-block;
  font-size: 11px;
  background: var(--bg-soft);
  color: var(--text-soft);
  padding: 2px 6px;
  border-radius: 4px;
  margin-bottom: 8px;
  font-weight: 600;
}

/* ── ASCII / SVG diagram blocks ─────────────────────────────── */

.diagram {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin: 1.5em 0;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 13px;
  line-height: 1.4;
  white-space: pre;
  overflow-x: auto;
}

/* SVG-based diagram — same outer chrome as .diagram, no monospace */
.svg-diagram {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin: 1.5em 0;
  overflow-x: auto;
}

.svg-diagram svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

/* ── Misc ───────────────────────────────────────────────────── */

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

ul, ol { padding-left: 1.5em; }
li { margin: 0.3em 0; }

kbd {
  display: inline-block;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: white;
  color: var(--text);
  vertical-align: middle;
}

.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text-soft);
  margin-left: 6px;
  vertical-align: middle;
}

.tag.read  { background: #e8f1fc; color: var(--accent); }
.tag.write { background: #fff4e5; color: #b86b00; }
.tag.danger { background: #fdecea; color: var(--err-border); }

footer {
  margin-top: 80px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-soft);
}

footer a { color: var(--text-soft); }

.next-prev {
  display: flex;
  justify-content: space-between;
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.next-prev a {
  text-decoration: none;
  color: var(--text-soft);
  font-size: 14px;
}

.next-prev a:hover { color: var(--accent); }
.next-prev .label { display: block; font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; }
.next-prev .title { font-weight: 600; color: var(--text); }

/* ── Agent-Talks additions ──────────────────────────────────── */

/* Session group heading on timeline */
.session-group {
  margin: 2.5em 0 1em 0;
  padding: 14px 18px;
  background: var(--bg-soft);
  border-radius: 10px;
  border: 1px solid var(--border);
}
.session-group h2 {
  margin: 0 0 4px 0;
  padding-top: 0;
  border-top: none;
  font-size: 18px;
}
.session-group .meta {
  font-size: 12px;
  color: var(--text-soft);
  font-family: "SF Mono", Menlo, monospace;
}

/* Individual conversation turn */
.convo-turn {
  border-left: 3px solid var(--border);
  padding: 12px 18px;
  margin: 14px 0;
  border-radius: 0 8px 8px 0;
  background: white;
}
.convo-turn.user {
  border-left-color: var(--accent);
  background: var(--accent-soft);
}
.convo-turn.assistant {
  border-left-color: var(--text-soft);
  background: var(--bg-soft);
}
.convo-turn > header {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 12.5px;
  color: var(--text-soft);
  margin-bottom: 8px;
}
.convo-turn .role {
  font-weight: 700;
  color: var(--text);
  font-size: 13px;
}
.convo-turn time {
  font-family: "SF Mono", Menlo, monospace;
}
.convo-turn .tools-used {
  margin-left: auto;
  font-size: 11px;
  background: white;
  padding: 1px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
}
.convo-turn .content {
  font-size: 14.5px;
}
.convo-turn .content > p:first-child { margin-top: 0; }
.convo-turn .content > p:last-child { margin-bottom: 0; }
.convo-turn details {
  margin-top: 10px;
  font-size: 13px;
}
.convo-turn details summary {
  cursor: pointer;
  color: var(--text-soft);
  padding: 4px 0;
  user-select: none;
}
.convo-turn details summary:hover { color: var(--accent); }
.convo-turn details pre { font-size: 12px; }

/* Issue card */
.issue-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  margin: 16px 0;
  background: white;
}
.issue-card > header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}
.issue-card h3 {
  margin: 0;
  font-size: 17px;
}
.issue-card .status {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.issue-card .status.resolved { background: var(--ok-bg); color: var(--ok-border); }
.issue-card .status.open     { background: var(--warn-bg); color: var(--warn-border); }
.issue-card .status.blocked  { background: var(--err-bg); color: var(--err-border); }
.issue-card .meta {
  font-size: 12px;
  color: var(--text-soft);
  font-family: "SF Mono", Menlo, monospace;
  margin-bottom: 8px;
}
.issue-card .resolution {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}
.issue-card .resolution h4 {
  margin: 0 0 6px 0;
  font-size: 12px;
  color: var(--ok-border);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Research entry */
.research-entry {
  margin: 22px 0;
  padding: 16px 22px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 10px 10px 0;
}
.research-entry h3 {
  margin: 0 0 4px 0;
  font-size: 17px;
  color: var(--accent);
}
.research-entry .meta {
  font-size: 12px;
  color: var(--text-soft);
  font-family: "SF Mono", Menlo, monospace;
  margin-bottom: 10px;
}
.research-entry .findings { padding-left: 1.4em; }
.research-entry .sources {
  font-size: 12px;
  color: var(--text-soft);
  margin-top: 10px;
}

/* Plan change block */
.plan-change {
  margin: 22px 0;
  padding: 16px 20px;
  border-radius: 10px;
  background: white;
  border: 1px solid var(--border);
}
.plan-change > header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
}
.plan-change h3 { margin: 0; font-size: 16px; }
.plan-change time {
  font-size: 12px;
  color: var(--text-soft);
  font-family: "SF Mono", Menlo, monospace;
}
.plan-change .diff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 10px;
}
@media (max-width: 700px) {
  .plan-change .diff { grid-template-columns: 1fr; }
}
.plan-change .before, .plan-change .after {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
}
.plan-change .before { background: var(--err-bg); }
.plan-change .after  { background: var(--ok-bg); }
.plan-change .before h4,
.plan-change .after  h4 {
  margin: 0 0 4px 0;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-soft);
}
.plan-change .reason {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-soft);
  font-style: italic;
}

/* Session stat row on index */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin: 1.5em 0;
}
.stat {
  padding: 14px 16px;
  background: var(--bg-soft);
  border-radius: 10px;
  border: 1px solid var(--border);
}
.stat .label {
  font-size: 11px;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.stat .value {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
}

/* Session list on index */
.session-list { list-style: none; padding: 0; }
.session-list li {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}
.session-list li:last-child { border-bottom: none; }
.session-list .title { flex: 1; color: var(--text); font-weight: 500; }
.session-list time {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--text-soft);
}
.session-list .turns {
  font-size: 12px;
  color: var(--text-soft);
}