/* ============================================================
   Fieldguide — documentation training platform
   Dark, calm, text-first. No emoji. No nav chrome bloat.
   ============================================================ */

:root {
  --bg:            #0b0d10;
  --bg-raised:     #11141a;
  --bg-sunken:     #08090c;
  --bg-hover:      #171b23;
  --line:          #1e232c;
  --line-strong:   #2b323d;

  --ink:           #e8eaed;
  --ink-dim:       #9aa3b0;
  --ink-faint:     #6b7482;

  --accent:        #4d9cff;
  --accent-dim:    #2b6fd0;
  --accent-wash:   rgba(77, 156, 255, 0.10);

  --done:          #3fb950;
  --warn:          #d29922;
  --note:          #a371f7;

  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;

  --sidebar-w: 320px;
  /* ~80 chars at 17px — inside the comfortable reading measure */
  --maxw: 715px;
  --radius: 10px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  /* iOS: never below 16px or Safari zooms on focus */
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ---------- top bar ---------- */

.topbar {
  position: sticky; top: 0; z-index: 60;
  height: 56px;
  display: flex; align-items: center; gap: 14px;
  padding: 0 20px;
  background: rgba(11, 13, 16, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.topbar .brand {
  display: flex; align-items: center; gap: 9px;
  font-weight: 650; letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none; font-size: 15px;
}
.topbar .brand svg { color: var(--accent); flex: none; }
.topbar .crumb { color: var(--ink-faint); font-size: 13.5px; font-weight: 500; }
.topbar .crumb a { color: var(--ink-dim); text-decoration: none; }
.topbar .crumb a:hover { color: var(--ink); }

.topbar .spacer { flex: 1; }

.topbar .pct {
  font-family: var(--mono); font-size: 12.5px;
  color: var(--ink-dim); letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.menubtn {
  display: none;
  align-items: center; justify-content: center;
  width: 36px; height: 36px; flex: none;
  background: none; border: 1px solid var(--line-strong);
  border-radius: 8px; color: var(--ink-dim); cursor: pointer; padding: 0;
}
.menubtn:hover { color: var(--ink); border-color: var(--accent-dim); }

/* reading progress */
.readbar {
  position: fixed; top: 56px; left: 0; height: 2px; width: 0;
  background: var(--accent); z-index: 61; transition: width .08s linear;
}

/* ---------- layout ---------- */

.shell { display: flex; align-items: flex-start; }

.sidebar {
  position: sticky; top: 56px;
  width: var(--sidebar-w); flex: none;
  height: calc(100vh - 56px);
  overflow-y: auto;
  border-right: 1px solid var(--line);
  padding: 18px 0 60px;
  background: var(--bg-sunken);
}

.main {
  flex: 1; min-width: 0;
  padding: 44px 40px 120px;
}
.main > .inner { max-width: var(--maxw); margin: 0 auto; }

/* ---------- sidebar nav ---------- */

.snav-search {
  margin: 0 16px 16px;
}
.snav-search input {
  width: 100%; height: 38px;
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--ink);
  padding: 0 12px;
  font-family: var(--sans);
  font-size: 16px; /* prevents iOS zoom */
  outline: none;
}
.snav-search input:focus { border-color: var(--accent-dim); }
.snav-search input::placeholder { color: var(--ink-faint); }

.mod { margin-bottom: 4px; }

.mod-head {
  display: flex; align-items: center; gap: 9px;
  width: 100%;
  padding: 9px 16px;
  background: none; border: 0; cursor: pointer;
  color: var(--ink-dim);
  font-family: var(--sans); font-size: 13px; font-weight: 650;
  text-align: left; letter-spacing: 0.01em;
}
.mod-head:hover { color: var(--ink); background: var(--bg-hover); }
.mod-head .chev { margin-left: auto; transition: transform .18s ease; color: var(--ink-faint); flex: none; }
.mod-head[aria-expanded="false"] .chev { transform: rotate(-90deg); }
.mod-head .mnum {
  font-family: var(--mono); font-size: 11px; color: var(--ink-faint);
  min-width: 18px; flex: none;
}

.mod-list { list-style: none; margin: 0; padding: 0 0 6px; }
.mod-list[hidden] { display: none; }

.mod-list a {
  display: flex; gap: 10px; align-items: baseline;
  padding: 7px 16px 7px 34px;
  color: var(--ink-dim); text-decoration: none;
  font-size: 13.5px; line-height: 1.4;
  border-left: 2px solid transparent;
}
.mod-list a:hover { color: var(--ink); background: var(--bg-hover); }
.mod-list a.active {
  color: var(--ink); background: var(--accent-wash);
  border-left-color: var(--accent); font-weight: 600;
}
.mod-list a .ln {
  font-family: var(--mono); font-size: 11px; color: var(--ink-faint);
  min-width: 20px; flex: none; font-variant-numeric: tabular-nums;
}
.mod-list a.active .ln { color: var(--accent); }
.mod-list a .tick { margin-left: auto; color: var(--done); flex: none; opacity: 0; }
.mod-list a.is-done .tick { opacity: 1; }
.mod-list a .dot { margin-left: auto; flex: none; color: var(--ink-faint); opacity: .5; }
.mod-list a.is-done .dot { display: none; }

/* ---------- typography ---------- */

h1 {
  font-size: 33px; line-height: 1.2; letter-spacing: -0.022em;
  font-weight: 700; margin: 0 0 16px;
}
h2 {
  font-size: 22px; line-height: 1.3; letter-spacing: -0.014em;
  font-weight: 650; margin: 46px 0 14px;
  padding-bottom: 8px; border-bottom: 1px solid var(--line);
}
h3 { font-size: 17.5px; font-weight: 650; margin: 30px 0 10px; letter-spacing: -0.008em; }

p { margin: 0 0 17px; }
strong { color: #fff; font-weight: 640; }
em { color: var(--ink); font-style: italic; }

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

ul, ol { margin: 0 0 18px; padding-left: 22px; }
li { margin-bottom: 8px; }
li::marker { color: var(--ink-faint); }

blockquote {
  margin: 24px 0; padding: 4px 0 4px 18px;
  border-left: 2px solid var(--accent-dim);
  color: var(--ink); font-style: italic; font-size: 18px;
}
blockquote p:last-child { margin-bottom: 0; }

hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }

.muted { color: var(--ink-faint); font-size: 13.5px; }

/* ---------- code ---------- */

code {
  font-family: var(--mono); font-size: 0.875em;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1.5px 5px;
  color: #a8d8ff;
}

pre {
  position: relative;
  margin: 20px 0;
  padding: 16px 18px;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent-dim);
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 13.5px; line-height: 1.6;
}
pre code {
  background: none; border: 0; padding: 0;
  color: #c8d3e0; font-size: 13.5px;
  white-space: pre;
}

/* ---------- tables ---------- */

table {
  width: 100%; border-collapse: collapse;
  margin: 22px 0; font-size: 14.5px;
}
th {
  text-align: left; font-weight: 650; font-size: 12.5px;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--ink-faint);
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}
td {
  padding: 11px 12px 11px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
td:last-child, th:last-child { padding-right: 0; }
tbody tr:hover { background: rgba(255,255,255,0.014); }
td code { font-size: 0.82em; }

/* ---------- callouts ---------- */

.callout {
  margin: 26px 0; padding: 16px 18px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink-faint);
  border-radius: var(--radius);
}
.callout > :last-child { margin-bottom: 0; }
.callout p { margin-bottom: 12px; }

.callout-label {
  font-size: 11.5px !important; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--ink-faint); margin-bottom: 9px !important;
}

.callout.why      { border-left-color: var(--accent); }
.callout.why .callout-label { color: var(--accent); }
.callout.pitfall  { border-left-color: var(--warn); }
.callout.pitfall .callout-label { color: var(--warn); }
.callout.check    { border-left-color: var(--note); }
.callout.check .callout-label { color: var(--note); }
.callout.next     { border-left-color: var(--done); }
.callout.next .callout-label { color: var(--done); }

.keyline {
  margin: 26px 0; padding: 18px 20px;
  background: linear-gradient(180deg, var(--accent-wash), transparent);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}
.keyline > :last-child { margin-bottom: 0; }

details {
  margin: 14px 0; padding: 12px 16px;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-radius: 8px;
}
summary {
  cursor: pointer; color: var(--ink-dim);
  font-size: 14px; font-weight: 600;
  list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::before { content: "▸ "; color: var(--accent); }
details[open] summary::before { content: "▾ "; }
details[open] summary { margin-bottom: 10px; }

/* ---------- lesson header ---------- */

.lmeta {
  display: flex; flex-wrap: wrap; gap: 10px 16px;
  align-items: center;
  font-size: 12.5px; color: var(--ink-faint);
  margin-bottom: 16px;
  font-family: var(--mono); letter-spacing: 0.02em;
}
.lmeta .pill {
  padding: 3px 9px; border-radius: 99px;
  border: 1px solid var(--line-strong);
  background: var(--bg-raised);
}
.lmeta .pill.st-outline { color: var(--warn); border-color: rgba(210,153,34,.35); }
.lmeta .pill.st-written { color: var(--done); border-color: rgba(63,185,80,.35); }

.lede {
  font-size: 19px; line-height: 1.55; color: var(--ink-dim);
  margin: 0 0 30px;
}

/* objectives + agenda boxes */
.syllabus-box {
  margin: 0 0 34px; padding: 18px 20px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.syllabus-box h4 {
  margin: 0 0 10px; font-size: 11.5px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.09em; color: var(--ink-faint);
}
.syllabus-box ul, .syllabus-box ol { margin: 0; padding-left: 20px; font-size: 15px; }
.syllabus-box li { margin-bottom: 6px; }
.syllabus-box li:last-child { margin-bottom: 0; }

.agenda { list-style: none; padding: 0 !important; }
.agenda li {
  display: flex; gap: 14px; align-items: baseline;
  margin-bottom: 7px; font-size: 15px;
}
.agenda .mins {
  font-family: var(--mono); font-size: 12px; color: var(--accent);
  min-width: 46px; flex: none; font-variant-numeric: tabular-nums;
}

/* progress control */
.donebar {
  display: flex; align-items: center; gap: 14px;
  margin: 46px 0 0; padding-top: 22px;
  border-top: 1px solid var(--line);
}
.donebtn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 40px; padding: 0 16px;
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--ink-dim); cursor: pointer;
  font-family: var(--sans); font-size: 14px; font-weight: 600;
}
.donebtn:hover { color: var(--ink); border-color: var(--accent-dim); }
.donebtn.is-done {
  color: var(--done); border-color: rgba(63,185,80,.45);
  background: rgba(63,185,80,.08);
}
.donebar .note { font-size: 13px; color: var(--ink-faint); }

/* prev / next */
.pager {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin: 30px 0 0;
}
.pager a {
  display: block; padding: 14px 16px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
}
.pager a:hover { border-color: var(--accent-dim); text-decoration: none; }
.pager a .dir {
  display: block; font-size: 11.5px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--ink-faint); margin-bottom: 5px;
}
.pager a .ttl { color: var(--ink); font-size: 14.5px; font-weight: 600; line-height: 1.35; }
.pager a.next { text-align: right; }
.pager .empty { visibility: hidden; }

/* ---------- course home ---------- */

.hero { padding: 26px 0 8px; }
.hero .eyebrow {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 12px;
}
.hero h1 { font-size: 40px; }
.hero .sub { font-size: 19px; color: var(--ink-dim); margin-bottom: 4px; }

.statrow {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; margin: 30px 0 10px;
  background: var(--line); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
}
.stat { background: var(--bg-raised); padding: 15px 16px; }
.stat .k {
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--ink-faint); margin-bottom: 6px;
}
.stat .v { font-size: 21px; font-weight: 650; letter-spacing: -0.01em; }
.stat .v small { font-size: 13px; color: var(--ink-dim); font-weight: 500; }

.modcard {
  margin: 14px 0; padding: 20px 22px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.modcard .mh {
  display: flex; align-items: baseline; gap: 12px; margin-bottom: 6px;
}
.modcard .mh .num {
  font-family: var(--mono); font-size: 12px; color: var(--ink-faint); flex: none;
}
.modcard .mh h3 { margin: 0; font-size: 19px; }
.modcard .blurb { color: var(--ink-dim); font-size: 15px; margin: 0 0 14px; }

.lessons { list-style: none; padding: 0; margin: 0; }
.lessons li { margin: 0; }
.lessons a {
  display: flex; gap: 12px; align-items: baseline;
  padding: 9px 10px; margin: 0 -10px;
  border-radius: 7px;
  text-decoration: none; color: var(--ink-dim); font-size: 15px;
}
.lessons a:hover { background: var(--bg-hover); color: var(--ink); text-decoration: none; }
.lessons .n {
  font-family: var(--mono); font-size: 12px; color: var(--ink-faint);
  min-width: 22px; flex: none; font-variant-numeric: tabular-nums;
}
.lessons .mins {
  margin-left: auto; font-family: var(--mono); font-size: 11.5px;
  color: var(--ink-faint); flex: none;
}

/* ---------- platform home ---------- */

.catalog { display: grid; gap: 16px; margin: 34px 0; }
.coursecard {
  display: block; padding: 26px 28px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 14px;
  text-decoration: none;
}
.coursecard:hover { border-color: var(--accent-dim); text-decoration: none; }
.coursecard .num {
  font-family: var(--mono); font-size: 12px; color: var(--accent);
  letter-spacing: 0.1em; margin-bottom: 10px;
}
.coursecard h2 {
  border: 0; padding: 0; margin: 0 0 8px; font-size: 26px;
}
.coursecard p { color: var(--ink-dim); margin: 0 0 16px; font-size: 15.5px; }
.coursecard .facts {
  display: flex; flex-wrap: wrap; gap: 8px 20px;
  font-size: 13px; color: var(--ink-faint);
  font-family: var(--mono);
  padding-top: 16px; border-top: 1px solid var(--line);
}
.coursecard.planned {
  border-style: dashed; opacity: .68;
}
.coursecard.planned h2 { color: var(--ink-dim); }
.coursecard.planned .num { color: var(--ink-faint); }

.notice {
  margin: 26px 0; padding: 16px 18px;
  background: rgba(210,153,34,.06);
  border: 1px solid rgba(210,153,34,.22);
  border-left: 3px solid var(--warn);
  border-radius: var(--radius);
  font-size: 14.5px; color: var(--ink-dim);
}

/* ---------- footer ---------- */

.foot {
  margin-top: 60px; padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 13px; color: var(--ink-faint);
  display: flex; flex-wrap: wrap; gap: 10px 20px;
  justify-content: space-between;
}

/* ---------- mobile ---------- */

.overlay {
  display: none; position: fixed; inset: 0; z-index: 55;
  background: rgba(0,0,0,.6);
}
.overlay.on { display: block; }

@media (max-width: 980px) {
  .topbar { padding: 0 14px; gap: 10px; }
  .topbar .crumb { display: none; }
  .menubtn { display: inline-flex; }

  .sidebar {
    position: fixed; top: 0; left: 0; z-index: 58;
    height: 100vh; padding-top: 62px;
    width: 88vw; max-width: 360px;
    transform: translateX(-101%);
    transition: transform .22s ease;
    box-shadow: 0 0 40px rgba(0,0,0,.6);
  }
  .sidebar.open { transform: translateX(0); }

  .main { padding: 30px 20px 90px; }
  h1 { font-size: 27px; }
  .hero h1 { font-size: 31px; }
  h2 { font-size: 20px; margin-top: 38px; }
  body { font-size: 16.5px; }
  .lede { font-size: 17.5px; }

  .statrow { grid-template-columns: 1fr 1fr; }
  .stat .v { font-size: 19px; }

  .pager { grid-template-columns: 1fr; }
  .pager a.next { text-align: left; }

  /* wide tables become stacked label/value rows */
  table { font-size: 14px; }
  th { display: none; }
  td {
    display: block; padding: 4px 0 4px 0;
    border-bottom: 0;
  }
  tr {
    display: block; padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }
  td:first-child { font-weight: 640; color: #fff; }
  td:last-child { color: var(--ink-dim); }
}

@media (max-width: 420px) {
  .statrow { grid-template-columns: 1fr; }
}

@media print {
  .topbar, .sidebar, .readbar, .donebar, .pager, .overlay { display: none !important; }
  .main { padding: 0; }
  body { background: #fff; color: #000; font-size: 12pt; }
  a { color: #000; }
  pre, code, .callout, table { border-color: #ccc; }
}