/*
 * L8.1e (DEC-300 decision 4; covers L7.3): tutorials adopt the site style.
 * Chapters use the shared document layout (760 reading column, right-hand
 * On This Page rail via .sticky-index, above the content below 900 px), the
 * DEC-300 type scale and the one ledger. The masthead stays a navy panel
 * holding the DEC-302 trail and the H1.
 */
.tutorial-series { --amber-soft: #fdf3e0; --code-bg: #0d1c31; --code-text: #dbe7f6; }

.tutorial-series * { box-sizing: border-box; }
.tutorial-series {
  margin: 0;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--type-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
/* main already supplies the 1180 shell and the 16 px phone gutters. */
.tutorial-series .wrap { max-width: var(--page-width); margin: 0 auto; padding: 0; }

/* Masthead: navy instrument panel, trail, H1, lede, Mono meta row. */
.tutorial-series .masthead {
  margin-bottom: 40px;
  background: var(--panel);
  color: var(--panel-text);
  border-bottom: 3px solid var(--signal);
}
.tutorial-series .masthead .wrap { padding: 28px 32px 30px; }
.tutorial-series .masthead .editorial-breadcrumb {
  margin: 0 0 12px;
  color: var(--panel-muted);
  font: var(--weight-regular) var(--type-label)/1.4 var(--font-sans);
}
.tutorial-series .masthead .editorial-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}
.tutorial-series .masthead .editorial-breadcrumb li + li::before {
  content: "/";
  padding: 0 9px;
  color: var(--panel-muted);
}
.tutorial-series .masthead .editorial-breadcrumb a {
  color: var(--panel-text);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.tutorial-series .masthead h1 {
  max-width: var(--reading-width);
  margin: 0 0 14px;
  color: var(--panel-text);
  font-size: var(--type-h1);
  font-weight: var(--weight-semibold);
  letter-spacing: -0.02em;
  line-height: 1.15;
  text-wrap: balance;
  overflow-wrap: anywhere;
}
.tutorial-series .standfirst {
  max-width: var(--reading-width);
  margin: 0;
  color: var(--panel-muted);
  font-size: var(--type-h3);
  line-height: 1.6;
}
.tutorial-series .meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 28px;
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--panel-secondary);
  color: var(--panel-muted);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  letter-spacing: 0.05em;
}
.tutorial-series .meta-row code { padding: 0; background: none; color: inherit; font-size: inherit; }

/* Reading column: the site's .document-layout and .document-content. */
.tutorial-series .document-content { padding-bottom: 24px; }
.tutorial-series .document-content > * { max-width: 100%; }
.tutorial-series h2.sec {
  margin: 56px 0 16px;
  scroll-margin-top: 24px;
  text-wrap: balance;
}
.tutorial-series h2.sec:first-of-type { margin-top: 8px; }
.tutorial-series .sec-num {
  display: block;
  margin-bottom: 6px;
  color: var(--link);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.08em;
  line-height: 1.4;
  text-transform: uppercase;
}
.tutorial-series h3 { margin: 32px 0 8px; font-size: var(--type-h3); font-weight: var(--weight-semibold); line-height: 1.35; }
.tutorial-series p { margin: 0 0 18px; }
.tutorial-series a { color: var(--link); }
.tutorial-series strong { font-weight: var(--weight-semibold); }
.tutorial-series code {
  padding: 0.08em 0.36em;
  border-radius: 2px;
  background: var(--surface-strong);
  font-family: var(--font-mono);
  font-size: var(--type-code);
  word-break: break-word;
}
.tutorial-series .lede {
  margin-bottom: 34px;
  padding-left: 18px;
  border-left: 4px solid var(--signal);
  color: var(--text);
  font-size: var(--type-h3);
  line-height: 1.6;
}
.tutorial-series ul.plain, .tutorial-series ol.plain { margin: 0 0 20px; padding-left: 20px; }
.tutorial-series ul.plain li, .tutorial-series ol.plain li { margin-bottom: 8px; }

/* Figures: white panel with a 2 px navy top rule. */
.tutorial-series .fig {
  margin: 32px 0 34px;
  border-top: 2px solid var(--panel);
  background: var(--surface);
}
.tutorial-series .fig-head {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}
.tutorial-series .fig-tag {
  color: var(--link);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tutorial-series .fig-title { min-width: 0; color: var(--muted); font-size: var(--type-small); overflow-wrap: anywhere; }
.tutorial-series .fig-body { padding: 16px; overflow-x: auto; }
.tutorial-series .fig-body.flush { padding: 0; }
.tutorial-series .fig-note {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: var(--type-small);
}

/* Tables inside figures: Mono 12 labels, Small cells. */
.tutorial-series table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: var(--type-small);
}
.tutorial-series table.narrow { min-width: 380px; }
.tutorial-series th, .tutorial-series td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
.tutorial-series thead th {
  border-bottom: 2px solid var(--border-strong);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}
.tutorial-series tbody tr:last-child td { border-bottom: none; }
.tutorial-series td.mono, .tutorial-series th.mono { font-family: var(--font-mono); font-size: var(--type-code); }
.tutorial-series .num { font-variant-numeric: tabular-nums; }
.tutorial-series .null { color: var(--muted); }
.tutorial-series pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: var(--font-mono);
  font-size: var(--type-code);
  line-height: 1.6;
}
.tutorial-series pre code { padding: 0; background: none; color: inherit; font-size: inherit; }
.tutorial-series .c-key { color: #7fd3ff; }
.tutorial-series .c-str { color: #a9e6a0; }
.tutorial-series .c-com { color: #7f95ae; font-style: italic; }
.tutorial-series .c-fn { color: #f0c274; }
.tutorial-series .c-num { color: #f2a3c7; }

/* Left-ruled callouts stay in tutorials: blue "In the code", amber caution. */
.tutorial-series .deep, .tutorial-series .caution {
  margin: 28px 0 30px;
  padding: 18px 20px 4px;
  border-left: 4px solid var(--link);
  background: var(--surface-muted);
}
.tutorial-series .caution {
  padding-top: 16px;
  padding-bottom: 2px;
  border-left-color: var(--signal-amber);
  background: var(--amber-soft);
}
.tutorial-series .deep-tag {
  display: block;
  margin-bottom: 10px;
  color: var(--link);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tutorial-series .caution > .deep-tag { color: var(--signal-amber); }
.tutorial-series .deep p:last-child, .tutorial-series .caution p:last-child { margin-bottom: 14px; }
.tutorial-series .deep ul:last-child, .tutorial-series .caution ul:last-child { margin-bottom: 14px; }

/* Diagram components. */
.tutorial-series .stages { display: flex; flex-direction: column; margin: 0; padding: 0; list-style: none; }
.tutorial-series .stages li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.tutorial-series .stages li:last-child { border-bottom: none; }
.tutorial-series .stages .n {
  padding-top: 2px;
  color: var(--link);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: var(--weight-semibold);
}
.tutorial-series .stages .t { display: block; margin-bottom: 2px; font-size: var(--type-body); font-weight: var(--weight-semibold); }
.tutorial-series .stages .d { color: var(--muted); font-size: var(--type-small); }
.tutorial-series .gates { margin: 0; padding: 0 0 0 4px; list-style: none; }
.tutorial-series .gates li {
  position: relative;
  padding: 0 0 20px 26px;
  border-left: 2px solid var(--border);
  font-size: var(--type-small);
}
.tutorial-series .gates li:last-child { padding-bottom: 0; border-left-color: transparent; }
.tutorial-series .gates li::before {
  position: absolute;
  top: 5px;
  left: -7px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--border-strong);
  border-radius: 50%;
  background: var(--surface);
  content: "";
}
.tutorial-series .gates li.gate-hot::before { border-color: var(--signal-amber); background: var(--signal-amber); }
.tutorial-series .gates li.gate-done::before { border-color: var(--link); background: var(--link); }
.tutorial-series .gates .g { display: block; font-weight: var(--weight-semibold); }
.tutorial-series .gates .gd { color: var(--muted); }
.tutorial-series .compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  background: var(--border);
}
@media (min-width: 620px) {
  .tutorial-series .compare { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.tutorial-series .compare > div { padding: 14px 16px; background: var(--surface); }
.tutorial-series .compare h4 { margin: 0 0 8px; font-size: var(--type-body); font-weight: var(--weight-semibold); }
.tutorial-series .compare p { margin-bottom: 10px; color: var(--muted); font-size: var(--type-small); }
.tutorial-series .compare p:last-child { margin-bottom: 0; }
.tutorial-series .pill {
  display: inline-block;
  margin-right: 6px;
  padding: 2px 8px;
  border: 1px solid var(--border-strong);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}
.tutorial-series .pill--violated { border-color: var(--signal-amber); background: var(--amber-soft); color: var(--signal-amber); }
.tutorial-series .pill--high { border-color: var(--link); background: var(--link-soft); color: var(--link); }
.tutorial-series .pill--ok { border-color: var(--link); color: var(--link); }

/* Interface mock-ups inside figures. */
.tutorial-series .mock { background: var(--surface); font-size: var(--type-small); }
.tutorial-series .mock-bar {
  padding: 9px 14px;
  background: var(--panel);
  color: var(--panel-text);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  letter-spacing: 0.04em;
}
.tutorial-series .mock-body { padding: 16px; }
.tutorial-series .mock h4 { margin: 0 0 3px; font-size: var(--type-h3); font-weight: var(--weight-semibold); }
.tutorial-series .mock .criterion { margin: 0 0 16px; color: var(--muted); font-size: var(--type-small); }
/* Mock key-value blocks take the ledger's look; field names keep their case. */
.tutorial-series .kv {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  margin-bottom: 14px;
}
@media (min-width: 560px) {
  .tutorial-series .kv { grid-template-columns: 180px minmax(0, 1fr); }
}
.tutorial-series .kv > div { min-width: 0; padding: 8px 12px; background: var(--surface-muted); font-size: var(--type-small); overflow-wrap: anywhere; }
.tutorial-series .kv > div.k {
  background: var(--surface-strong);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: var(--weight-semibold);
}
.tutorial-series .btn-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tutorial-series .btn {
  padding: 7px 14px;
  border: 1px solid var(--panel);
  background: var(--panel);
  color: var(--panel-text);
  font-family: var(--font-sans);
  font-size: var(--type-small);
}
.tutorial-series .btn--ghost { border-color: var(--border-strong); background: transparent; color: var(--text); }

/* Terminology: the one ledger (.relationship-ledger) under a standard H2. */
.tutorial-series .terms { margin: 56px 0 0; }

/* Previous / Next chapter navigation. */
.tutorial-series .chapnav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}
.tutorial-series .chapnav span {
  display: block;
  margin-bottom: 3px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tutorial-series .chapnav a { font-weight: var(--weight-semibold); text-decoration: none; }
.tutorial-series .chapnav a:hover, .tutorial-series .chapnav a:focus-visible { text-decoration: underline; }
.tutorial-series .chapnav .end { color: var(--muted); font-weight: var(--weight-regular); }

.tutorial-series svg { display: block; max-width: 100%; height: auto; }
.tutorial-series :focus-visible { outline: 2px solid var(--link); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  .tutorial-series * { animation: none !important; transition: none !important; }
}

@media (max-width: 639px) {
  .tutorial-series .fig-body svg { min-width: 620px; max-width: none; }
}
@media (max-width: 560px) {
  .tutorial-series .masthead .wrap { padding: 20px 16px 22px; }
  .tutorial-series .masthead h1 { font-size: 28px; }
}