/* ──────────────────────────────────────────────────────────────
   US Coachways UX Strategy Book — shared styles
   ────────────────────────────────────────────────────────────── */

@import url("https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500;9..40,600;9..40,700&family=JetBrains+Mono:wght@400;500;600&display=swap");

:root {
  /* US Coachways brand — refreshed */
  --usc-navy-900: #061a30;
  --usc-navy-800: #0b2a4a;
  --usc-navy-700: #143864;
  --usc-navy-600: #1b4fa8;
  --usc-blue-500: #2c6fd1;
  --usc-blue-50:  #eaf2fb;
  --usc-red-700:  #9a1e22;
  --usc-red-600:  #c2271f;
  --usc-red-500:  #dc2f25;
  --usc-amber:    #f3b042;

  --paper:        #f7f4ec;
  --paper-2:      #efeadd;
  --ink-900:      #11161f;
  --ink-700:      #2c3340;
  --ink-500:      #5a6273;
  --ink-300:      #9098a8;
  --ink-200:      #c6ccd7;
  --ink-100:      #e4e7ee;

  --slate-50:     #f5f6f8;
  --slate-100:    #eceef2;
  --slate-200:    #d7dbe2;
  --slate-300:    #b4bac6;
  --slate-400:    #8b93a3;
  --slate-500:    #5d6678;
  --slate-700:    #2c3340;
  --slate-900:    #0e1320;

  --ok:           #1b8a4a;
  --warn:         #d97706;
  --danger:       #c2271f;

  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 14px;
  --r-xl: 22px;

  --shadow-card: 0 1px 0 rgba(11,42,74,.06), 0 8px 28px -12px rgba(11,42,74,.18);

  --font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
  --font-serif: "Instrument Serif", "Times New Roman", serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  color: var(--ink-900);
  background: var(--paper);
  font-size: 15.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--usc-navy-600); text-decoration: none; border-bottom: 1px solid rgba(27,79,168,.25); }
a:hover { color: var(--usc-red-600); border-bottom-color: var(--usc-red-600); }

h1, h2, h3, h4, h5 { font-family: var(--font-serif); font-weight: 400; letter-spacing: -.01em; color: var(--usc-navy-900); margin: 0; text-wrap: balance; }
h1 { font-size: clamp(48px, 6vw, 88px); line-height: .98; letter-spacing: -.02em; }
h2 { font-size: clamp(34px, 3.6vw, 52px); line-height: 1.02; }
h3 { font-size: clamp(24px, 2.2vw, 32px); line-height: 1.1; }
h4 { font-size: 20px; line-height: 1.2; font-family: var(--font-sans); font-weight: 600; letter-spacing: -.005em; }
h5 { font-size: 13px; line-height: 1.2; font-family: var(--font-sans); font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-500); }

p { margin: 0 0 .9em; text-wrap: pretty; max-width: 70ch; }
.lede { font-size: 19px; line-height: 1.5; color: var(--ink-700); max-width: 64ch; }
em { font-family: var(--font-serif); font-style: italic; font-size: 1.08em; color: var(--usc-navy-700); }

ul, ol { padding-left: 1.2em; margin: 0 0 1em; max-width: 70ch; }
li { margin-bottom: .35em; }
li::marker { color: var(--ink-300); }

hr { border: 0; border-top: 1px solid var(--ink-100); margin: 48px 0; }

/* ─── Page shell ──────────────────────────────────────────── */
.book {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky; top: 0; align-self: start;
  height: 100vh;
  padding: 28px 24px;
  background: var(--usc-navy-900);
  color: rgba(255,255,255,.85);
  overflow-y: auto;
  display: flex; flex-direction: column; gap: 18px;
}
.sidebar .brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-sans);
  letter-spacing: .04em; text-transform: uppercase;
  font-size: 11px; color: rgba(255,255,255,.65);
}
.sidebar .brand .dot {
  width: 26px; height: 26px; border-radius: 4px;
  background: var(--usc-red-600);
  display: grid; place-items: center;
  color: #fff; font-family: var(--font-serif); font-size: 18px; line-height: 1;
}
.sidebar h6 {
  font-family: var(--font-sans); font-weight: 600; font-size: 11px;
  letter-spacing: .12em; text-transform: uppercase;
  color: rgba(255,255,255,.42);
  margin: 6px 0 4px;
}
.sidebar nav { display: flex; flex-direction: column; gap: 2px; }
.sidebar nav a {
  display: flex; align-items: baseline; gap: 10px;
  color: rgba(255,255,255,.78);
  font-size: 14px;
  padding: 6px 8px;
  border-radius: 4px;
  border: 0;
  text-decoration: none;
}
.sidebar nav a:hover { background: rgba(255,255,255,.06); color: #fff; }
.sidebar nav a .num { font-family: var(--font-mono); font-size: 11px; color: rgba(255,255,255,.4); width: 22px; flex-shrink: 0; }
.sidebar .foot {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.12);
  font-size: 12px;
  color: rgba(255,255,255,.5);
  line-height: 1.4;
}

.main {
  padding: 0;
  min-width: 0;
}

.page {
  padding: 96px clamp(28px, 6vw, 96px);
  border-bottom: 1px solid var(--ink-100);
  max-width: 1280px;
}
.page.compact { padding-top: 64px; padding-bottom: 64px; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--usc-red-600);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: ""; width: 18px; height: 1px; background: var(--usc-red-600);
}

/* ─── Components ──────────────────────────────────────────── */
.callout {
  background: #fff;
  border: 1px solid var(--ink-100);
  border-left: 4px solid var(--usc-red-600);
  padding: 18px 22px;
  border-radius: var(--r-md);
  margin: 22px 0;
  max-width: 76ch;
}
.callout h5 { color: var(--usc-red-600); margin-bottom: 6px; }
.callout.info { border-left-color: var(--usc-navy-600); }
.callout.info h5 { color: var(--usc-navy-600); }
.callout.ok { border-left-color: var(--ok); }
.callout.ok h5 { color: var(--ok); }
.callout.warn { border-left-color: var(--warn); }
.callout.warn h5 { color: var(--warn); }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 9px;
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: .04em;
  border-radius: 999px;
  background: var(--slate-100);
  color: var(--ink-700);
  border: 1px solid var(--slate-200);
}
.tag.red { background: #fff0ee; color: var(--usc-red-700); border-color: #fbd8d3; }
.tag.navy { background: var(--usc-blue-50); color: var(--usc-navy-700); border-color: #c8dcf3; }
.tag.ok { background: #e8f5ec; color: #136b34; border-color: #c4e3cf; }
.tag.warn { background: #fdf2dd; color: #8a5a07; border-color: #f3dba2; }

.kbd {
  font-family: var(--font-mono); font-size: 12px;
  padding: 1px 6px;
  border: 1px solid var(--ink-200);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: #fff;
}

/* ─── Tables ──────────────────────────────────────────── */
.tbl {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 14px;
  background: #fff;
  border: 1px solid var(--ink-100);
  border-radius: var(--r-md);
  overflow: hidden;
  margin: 18px 0;
}
.tbl th, .tbl td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--ink-100);
  vertical-align: top;
}
.tbl th {
  background: var(--paper-2);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-700);
}
.tbl tr:last-child td { border-bottom: 0; }
.tbl td.feat { font-weight: 600; color: var(--usc-navy-900); width: 26%; }
.tbl td.win { background: #f0f8f3; }
.tbl td.lose { background: #fdf2f1; }
.tbl td.mid { background: #fdf6e7; }

.tbl .check { color: var(--ok); font-weight: 700; }
.tbl .x { color: var(--danger); font-weight: 700; }
.tbl .partial { color: var(--warn); font-weight: 700; }

/* ─── Two-up + grids ──────────────────────────────────────── */
.cols-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.cols-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
.cols-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 900px) {
  .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; }
}

.card {
  background: #fff;
  border: 1px solid var(--ink-100);
  border-radius: var(--r-md);
  padding: 22px;
}
.card h4 { margin-bottom: 8px; }
.card .meta {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-bottom: 14px;
}

/* ─── Hero ──────────────────────────────────────────── */
.hero {
  padding: 120px clamp(28px, 6vw, 96px) 80px;
  background:
    radial-gradient(120% 80% at 90% 0%, rgba(27,79,168,.18) 0%, transparent 55%),
    radial-gradient(80% 80% at 0% 100%, rgba(194,39,31,.10) 0%, transparent 55%),
    var(--paper);
  border-bottom: 1px solid var(--ink-100);
}
.hero .title-stack { display: flex; flex-direction: column; gap: 20px; }
.hero h1 .accent { color: var(--usc-red-600); font-style: italic; }
.hero .meta-row {
  display: flex; flex-wrap: wrap; gap: 24px;
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-500);
  margin-top: 20px;
}
.hero .meta-row strong { color: var(--ink-900); font-weight: 600; }

/* ─── Wireframe inline blueprints ─────────────────────── */
.wf-frame {
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: var(--r-md);
  padding: 14px;
  margin: 0;
}
.wf-frame .wf-label {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--ink-500);
  margin-bottom: 8px;
  display: flex; justify-content: space-between;
}
.wf {
  background: var(--slate-100);
  border: 1px solid var(--slate-300);
  font-family: var(--font-mono);
  color: var(--slate-700);
  font-size: 11px;
  line-height: 1.35;
}
.wf .wf-box { border: 1px solid var(--slate-300); background: var(--slate-50); padding: 8px; }
.wf .wf-box.dashed { border-style: dashed; }
.wf .wf-box.fill { background: var(--slate-200); }
.wf .wf-box.dark { background: var(--slate-700); color: #fff; }
.wf .wf-img { background: var(--slate-200); border: 1px dashed var(--slate-400); color: var(--slate-500); display: grid; place-items: center; }
.wf .wf-cta { background: var(--slate-700); color: #fff; padding: 8px 12px; text-align: center; }
.wf .row { display: flex; gap: 6px; }
.wf .col { display: flex; flex-direction: column; gap: 6px; }
.wf .hdr {
  display: flex; justify-content: space-between; align-items: center;
  padding: 6px 8px; background: var(--slate-200); border-bottom: 1px solid var(--slate-300);
}
.wf .stub { display: inline-block; height: 8px; background: var(--slate-300); border-radius: 2px; }
.wf .stub.lg { height: 14px; }
.wf .stub.fill { background: var(--slate-500); }

.wf-pair {
  display: grid; grid-template-columns: 280px 1fr; gap: 18px;
  margin: 14px 0;
}
@media (max-width: 900px) { .wf-pair { grid-template-columns: 1fr; } }

/* ─── Mermaid ──────────────────────────────────────── */
.mermaid {
  background: #fff;
  border: 1px solid var(--ink-100);
  border-radius: var(--r-md);
  padding: 18px;
  overflow: auto;
}

/* ─── Code spec ──────────────────────────────────────── */
pre.spec, code.spec {
  font-family: var(--font-mono);
  font-size: 12.5px;
  background: var(--usc-navy-900);
  color: #d6e2f3;
  padding: 18px;
  border-radius: var(--r-md);
  overflow-x: auto;
  line-height: 1.55;
}
pre.spec .k { color: #f3b042; }
pre.spec .s { color: #9bd8a3; }
pre.spec .c { color: #6f86a8; font-style: italic; }
pre.spec .n { color: #c8252c; }

/* ─── Persona card ──────────────────────────────── */
.persona {
  background: #fff;
  border: 1px solid var(--ink-100);
  border-radius: var(--r-md);
  padding: 24px;
  display: flex; flex-direction: column; gap: 14px;
}
.persona .avatar {
  width: 60px; height: 60px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--font-serif); font-size: 28px;
  background: var(--usc-blue-50); color: var(--usc-navy-700);
}
.persona .name { font-family: var(--font-serif); font-size: 26px; color: var(--usc-navy-900); }
.persona .role { font-size: 12px; font-family: var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-500); }
.persona dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; font-size: 13.5px; }
.persona dt { color: var(--ink-500); font-weight: 500; }
.persona dd { margin: 0; }

/* ─── Token swatches ──────────────────────────── */
.swatch {
  display: flex; flex-direction: column; gap: 4px;
}
.swatch .chip {
  height: 56px; border-radius: var(--r-sm);
  border: 1px solid rgba(0,0,0,.06);
}
.swatch .name { font-size: 12px; font-family: var(--font-mono); color: var(--ink-700); }
.swatch .hex { font-size: 11px; font-family: var(--font-mono); color: var(--ink-500); }

/* ─── Timeline ──────────────────────────────────── */
.tl { position: relative; padding-left: 24px; }
.tl::before {
  content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px;
  width: 2px; background: var(--ink-200);
}
.tl-phase {
  position: relative; padding: 10px 0 22px;
}
.tl-phase::before {
  content: ""; position: absolute; left: -22px; top: 16px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--usc-red-600); border: 3px solid var(--paper);
}
.tl-phase .when { font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--usc-navy-700); }
.tl-phase h4 { margin: 2px 0 6px; }

/* ─── Misc ──────────────────────────── */
.kpi {
  background: #fff;
  border: 1px solid var(--ink-100);
  border-radius: var(--r-md);
  padding: 18px 20px;
}
.kpi .v { font-family: var(--font-serif); font-size: 44px; line-height: 1; color: var(--usc-navy-900); }
.kpi .l { font-size: 12px; font-family: var(--font-mono); letter-spacing: .04em; text-transform: uppercase; color: var(--ink-500); margin-top: 6px; }

.section-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--usc-red-600);
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 12px;
}
.section-num::before {
  content: ""; width: 28px; height: 1px; background: var(--usc-red-600);
}

/* responsive */
@media (max-width: 900px) {
  .book { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; }
  .page { padding: 56px 24px; }
  .hero { padding: 72px 24px 48px; }
}

/* ─── deep-link section anchors ─── */
section[id] { scroll-margin-top: 20px; }