/* ============================================================
   Designing with Claude — Workbook Series
   Brand system: Berta-aligned dark editorial
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Base */
  --bg:        #000000;
  --panel:     #111111;
  --panel-2:   #1a1a1a;
  --panel-3:   #222222;

  /* Text */
  --text:      #FFFFFF;
  --text-2:    #B3B3B3;
  --text-3:    #666666;

  /* Accents — ONE per page rule */
  --tech:      #3B82F6;  /* AI / tech */
  --gold:      #C9A84C;  /* publishing / authority */
  --warn:      #EF4444;  /* warnings */
  --sig:       #7BB7A8;  /* signature / case studies */

  /* Rules */
  --rule:      #222222;
  --rule-2:    #333333;

  /* Type */
  --display: 'Syne', 'Inter', sans-serif;
  --sans:    'Inter', system-ui, sans-serif;
  --mono:    'JetBrains Mono', ui-monospace, monospace;

  /* Page — US Letter @ 96dpi */
  --page-w: 816px;
  --page-h: 1056px;
  --margin-x: 72px;
  --margin-y: 84px;
}

* { box-sizing: border-box; }

img, svg, video {
  max-width: 100%;
  height: auto;
}

html, body {
  margin: 0;
  padding: 0;
  background: #050505;
  font-family: var(--sans);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ============================================================
   Page accent scoping — one accent per page
   ============================================================ */
.page              { --accent: var(--gold); }
.page[data-accent="tech"]  { --accent: var(--tech); }
.page[data-accent="gold"]  { --accent: var(--gold); }
.page[data-accent="warn"]  { --accent: var(--warn); }
.page[data-accent="sig"]   { --accent: var(--sig); }
.page[data-accent="none"]  { --accent: var(--text); }

/* ============================================================
   Workbook container (preview only)
   ============================================================ */
.workbook {
  max-width: var(--page-w);
  margin: 0 auto;
  padding: 40px 0 80px;
}

/* ============================================================
   Page — one physical sheet
   ============================================================ */
.page {
  width: var(--page-w);
  min-height: var(--page-h);
  background: var(--bg);
  color: var(--text);
  position: relative;
  margin: 0 auto 24px;
  padding: var(--margin-y) var(--margin-x);
  page-break-after: always;
  break-after: page;
  overflow: hidden;
  box-shadow: 0 12px 60px rgba(0,0,0,0.6);
}

.page.panel-bg { background: var(--panel); }

/* Running header + footer */
.page-header,
.page-footer {
  position: absolute;
  left: var(--margin-x);
  right: var(--margin-x);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
}
.page-header { top: 36px; }
.page-footer { bottom: 36px; }
.page-header .rule,
.page-footer .rule {
  flex: 1;
  height: 1px;
  background: var(--rule-2);
  margin: 0 14px;
}

/* ============================================================
   Typography
   ============================================================ */
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 18px;
}

.h-display {
  font-family: var(--display);
  font-weight: 700;
  font-size: 84px;
  line-height: 0.92;
  letter-spacing: -0.035em;
  margin: 0;
  color: var(--text);
}

.h-display.xxl {
  font-size: 128px;
  font-weight: 800;
  letter-spacing: -0.045em;
}

.h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 52px;
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
}

.h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 32px;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}

.h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 10px;
  color: var(--text);
}

.body {
  font-family: var(--sans);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-2);
  text-wrap: pretty;
  font-weight: 400;
}

.body-lg {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text-2);
  text-wrap: pretty;
}

.lede {
  font-family: var(--sans);
  font-size: 20px;
  line-height: 1.45;
  color: var(--text);
  font-weight: 300;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.caption {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}

.meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-3);
}

/* ============================================================
   Components
   ============================================================ */

.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 5px 10px;
  border: 1px solid var(--rule-2);
  border-radius: 100px;
  color: var(--text-2);
  background: transparent;
}
.pill.filled {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.pill.accent {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.pill.ghost-accent {
  color: var(--accent);
  border-color: var(--accent);
}

.divider {
  border: 0;
  height: 1px;
  background: var(--rule-2);
  margin: 24px 0;
}
.divider.thick {
  height: 2px;
  background: var(--text);
}
.divider.accent {
  height: 2px;
  background: var(--accent);
}

.callout {
  border: 1px solid var(--rule-2);
  padding: 22px 24px;
  position: relative;
  background: var(--panel);
}
.callout .callout-label {
  position: absolute;
  top: -9px;
  left: 20px;
  background: var(--bg);
  padding: 0 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}
.callout.on-panel .callout-label { background: var(--panel); }
.callout.warn {
  border-color: var(--warn);
}
.callout.warn .callout-label { color: var(--warn); }

.prompt-box {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  background: var(--panel);
  color: var(--text);
  padding: 22px 22px 22px;
  border: 1px solid var(--rule-2);
  border-left: 3px solid var(--accent);
  position: relative;
  white-space: pre-wrap;
}
.prompt-box::before {
  content: 'PROMPT';
  position: absolute;
  top: -10px;
  left: 14px;
  background: var(--bg);
  color: var(--accent);
  padding: 2px 8px;
  font-size: 9px;
  letter-spacing: 0.18em;
}
.prompt-box.response::before { content: 'CLAUDE'; }
.prompt-box .comment { color: var(--text-3); }
.prompt-box .hl { color: var(--accent); }

.placeholder {
  background:
    repeating-linear-gradient(
      45deg,
      transparent 0 12px,
      rgba(255,255,255,0.03) 12px 13px
    ),
    var(--panel);
  border: 1px dashed var(--rule-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
  text-align: center;
  padding: 16px;
}

.numbered {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  align-items: start;
  margin-bottom: 20px;
}
.numbered .num {
  font-family: var(--display);
  font-size: 36px;
  line-height: 1;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}
.numbered .num-title {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  margin: 6px 0 4px;
  color: var(--text);
}
.numbered .num-body {
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-2);
}

/* Grid utilities */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }

.stack-xs > * + * { margin-top: 6px; }
.stack-sm > * + * { margin-top: 12px; }
.stack-md > * + * { margin-top: 20px; }
.stack-lg > * + * { margin-top: 32px; }
.stack-xl > * + * { margin-top: 48px; }

/* Checkbox for exercises */
.check {
  display: inline-block;
  width: 13px; height: 13px;
  border: 1.5px solid var(--text);
  margin-right: 10px;
  vertical-align: -2px;
}

/* Exercise block */
.exercise {
  border-top: 2px solid var(--accent);
  border-bottom: 1px solid var(--rule-2);
  padding: 22px 0 26px;
  margin-top: 28px;
}
.exercise .ex-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

/* Level indicator */
.level {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-2);
}
.level .dots { display: inline-flex; gap: 3px; }
.level .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: transparent;
  border: 1px solid var(--text-3);
}
.level .dot.on {
  background: var(--accent);
  border-color: var(--accent);
}

/* Swatch */
.swatch {
  aspect-ratio: 1/1;
  border-radius: 2px;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 10px;
  border: 1px solid var(--rule-2);
}
.swatch .swatch-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--text);
  text-transform: uppercase;
}

/* Big chapter number */
.chapter-num {
  font-family: var(--display);
  font-weight: 700;
  font-size: 260px;
  line-height: 0.8;
  letter-spacing: -0.06em;
  color: var(--text);
}
.chapter-num.outline {
  color: transparent;
  -webkit-text-stroke: 2px var(--text);
}

/* Marker corners */
.mark-corner {
  position: absolute;
  width: 28px; height: 28px;
  pointer-events: none;
}
.mark-corner.tl { top: 32px; left: 32px;
  border-top: 1.5px solid var(--accent);
  border-left: 1.5px solid var(--accent); }
.mark-corner.tr { top: 32px; right: 32px;
  border-top: 1.5px solid var(--accent);
  border-right: 1.5px solid var(--accent); }
.mark-corner.bl { bottom: 32px; left: 32px;
  border-bottom: 1.5px solid var(--accent);
  border-left: 1.5px solid var(--accent); }
.mark-corner.br { bottom: 32px; right: 32px;
  border-bottom: 1.5px solid var(--accent);
  border-right: 1.5px solid var(--accent); }

/* Asterism (section break) */
.asterism {
  font-family: var(--display);
  font-size: 20px;
  letter-spacing: 1em;
  color: var(--text-3);
  text-align: center;
  margin: 32px 0;
}

/* Cards (for TOC, module lists) */
.card {
  border: 1px solid var(--rule-2);
  padding: 20px 22px;
  background: var(--panel);
  position: relative;
}
.card .card-num {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--text-3);
}
.card .card-title {
  font-family: var(--display);
  font-size: 22px;
  font-weight: 600;
  margin: 6px 0 6px;
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.card .card-desc {
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--text-2);
  line-height: 1.55;
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 13px;
}
.table th, .table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--rule-2);
  vertical-align: top;
}
.table th {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
  font-weight: 500;
  border-bottom: 1px solid var(--text);
}
.table td { color: var(--text-2); }
.table td:first-child { color: var(--text); font-weight: 500; }

/* Folio (page number marker) */
.folio {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-3);
}

/* Print */
@media print {
  @page { size: letter; margin: 0; }
  html, body { background: var(--bg); }
  .workbook { padding: 0; max-width: none; }
  .no-print { display: none !important; }
  .page {
    box-shadow: none !important;
    margin: 0 !important;
    page-break-after: always;
  }
  .page:last-child { page-break-after: auto; }
}

/* ============================================================
   Mobile viewer — scale pages to fit viewport width
   Applied via JS in scripts/workbook-mobile.js
   The CSS below handles the container; JS does the scale calc.
   ============================================================ */
@media (max-width: 860px) {
  html, body {
    overflow-x: hidden;
    background: #050505;
  }
  .workbook {
    padding: 20px 0 60px;
    /* Width is set dynamically by JS; overflow hidden prevents bleed */
    overflow-x: hidden;
  }
  /* Each .page gets transform: scale(N) from JS.
     These base rules prevent layout shift before JS runs. */
  .page {
    transform-origin: top center;
    /* Prevent native overflow; JS sets margin-bottom to collapse
       the whitespace left by scale-down */
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  }
  /* Toolbar: stack on small screens */
  .toolbar {
    top: 10px; right: 10px;
    flex-wrap: wrap;
    max-width: calc(100vw - 20px);
  }
  .toolbar a, .toolbar button {
    padding: 6px 10px;
    font-size: 10px;
  }
}

/* Match landing.css: stack inline grids on narrow viewports (volume HTML has no landing.css) */
@media (max-width: 900px) {
  [data-stack-sm] {
    grid-template-columns: 1fr !important;
  }
}