/* Untangle Playbook — design tokens + chrome */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  --bg: #F4EFE6;
  --bg-2: #ECE4D5;
  --paper: #FBF7EE;
  --ink: #1A1814;
  --ink-2: #3A352D;
  --muted: #6B6357;
  --line: #1A1814;
  --line-soft: #1A18141A;
  --accent: #FF5A36;
  --sage: #9FB89A;
  --mustard: #E8B948;
  --plum: #6B4D7A;
  --sky: #8AB4C8;
  --spotify: #1DB954;
  --maxw: 1280px;
  --font: "Outfit", system-ui, sans-serif;
  --serif: "Instrument Serif", "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}
[data-theme="cool"] { --bg:#EAEEF0; --bg-2:#DCE3E6; --paper:#F3F6F7; --ink:#0E1A1F; --ink-2:#2A3940; --muted:#5C6B72; --line:#0E1A1F; --accent:#2C5FCC; }
[data-theme="contrast"] { --bg:#FFF; --bg-2:#F2F2F2; --paper:#FFF; --ink:#000; --ink-2:#111; --muted:#444; --line:#000; --accent:#FF2D00; }
[data-theme="dark"] { --bg:#14110D; --bg-2:#1F1B16; --paper:#1A1813; --ink:#F4EFE6; --ink-2:#E0D8C8; --muted:#998E7E; --line:#F4EFE6; --accent:#FF6F4D; }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { font-family: var(--font); background: var(--bg); color: var(--ink); -webkit-font-smoothing: antialiased; line-height: 1.45; }
button { font-family: inherit; }
a { color: inherit; }

/* === SHELL === */
.pb-app {
  position: relative;
  min-height: 100vh;
  display: flex; flex-direction: column;
  background: var(--bg);
}

/* Top bar */
.pb-top {
  position: sticky; top: 0; z-index: 30;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.pb-top-row {
  max-width: var(--maxw); margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; gap: 24px;
}
.pb-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; letter-spacing: -0.02em; cursor: pointer; background:none; border:none; padding:0; color: var(--ink); }
.pb-brand svg { width: 26px; height: 26px; }
.pb-chapter-label {
  flex: 1;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted);
  display: flex; align-items: center; gap: 10px;
}
.pb-chapter-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.pb-top-actions { display: flex; gap: 10px; align-items: center; }
.pb-icon-btn {
  width: 38px; height: 38px;
  border: 1px solid var(--line); border-radius: 50%;
  background: transparent; color: var(--ink); cursor: pointer;
  display: grid; place-items: center;
  transition: background 0.15s, color 0.15s;
}
.pb-icon-btn:hover { background: var(--ink); color: var(--bg); }

/* Progress bar */
.pb-progress {
  height: 4px; background: var(--line-soft);
  position: relative;
}
.pb-progress > div {
  height: 100%; background: var(--accent);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Page surface */
.pb-stage {
  flex: 1;
  position: relative;
  overflow: hidden;
}
.pb-page {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 48px 28px 120px;
  animation: pbIn 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.pb-page.back { animation: pbInBack 0.4s cubic-bezier(0.2, 0.8, 0.2, 1); }
@keyframes pbIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pbInBack {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Bottom nav */
.pb-bottom {
  position: sticky; bottom: 0; z-index: 30;
  background: var(--bg);
  border-top: 1px solid var(--line);
}
.pb-bottom-row {
  max-width: var(--maxw); margin: 0 auto;
  padding: 14px 24px;
  display: grid; grid-template-columns: 1fr auto 1fr;
  gap: 20px; align-items: center;
}
.pb-counter {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted);
  text-align: center;
  white-space: nowrap;
}
.pb-counter strong { color: var(--ink); font-weight: 600; font-size: 14px; letter-spacing: -0.01em; text-transform: none; font-family: var(--font); }
.pb-credit {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 24px 12px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--muted); text-align: center;
}
.pb-credit a { color: var(--muted); text-decoration: none; border-bottom: 1px solid transparent; transition: color 0.15s, border-color 0.15s; }
.pb-credit a:hover { color: var(--accent); border-bottom-color: currentColor; }
.pb-nav-btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--line); border-radius: 100px;
  background: transparent; color: var(--ink); cursor: pointer;
  font-size: 14px; font-weight: 500;
  transition: background 0.15s, color 0.15s, transform 0.15s;
}
.pb-nav-btn:hover:not(:disabled) { background: var(--ink); color: var(--bg); transform: translateY(-1px); }
.pb-nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.pb-nav-btn.next { background: var(--accent); border-color: var(--accent); color: #fff; }
.pb-nav-btn.next:hover:not(:disabled) { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.pb-prev { justify-self: start; }
.pb-next { justify-self: end; }

/* Drawer (chapter index) */
.pb-drawer-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0,0,0,0.4);
  display: none;
  animation: fadeIn 0.2s;
}
.pb-drawer-overlay.open { display: block; }
.pb-drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: 420px; max-width: 90vw;
  background: var(--paper);
  border-left: 1px solid var(--line);
  z-index: 101;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  display: flex; flex-direction: column;
}
.pb-drawer.open { transform: translateX(0); }
.pb-drawer-head { padding: 20px 24px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; }
.pb-drawer-head h3 { margin: 0; font-size: 22px; letter-spacing: -0.02em; }
.pb-drawer-list { flex: 1; overflow-y: auto; padding: 8px 0; }
.pb-drawer-chapter {
  padding: 8px 24px;
  border-bottom: 1px solid var(--line-soft);
}
.pb-drawer-chapter h4 {
  margin: 12px 0 8px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); font-weight: 500;
  display: flex; align-items: center; gap: 8px;
}
.pb-drawer-chapter h4 .swatch { width: 10px; height: 10px; border-radius: 50%; }
.pb-drawer-page {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--ink);
  cursor: pointer;
  background: transparent; border: none; width: 100%; text-align: left;
  font-size: 14px; font-family: var(--font);
  transition: background 0.15s;
  display: flex; gap: 12px; align-items: center;
}
.pb-drawer-page:hover { background: var(--bg-2); }
.pb-drawer-page.current { background: var(--ink); color: var(--bg); font-weight: 500; }
.pb-drawer-page .num {
  font-family: var(--mono); font-size: 11px; opacity: 0.6; min-width: 24px;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* === TYPE === */
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink); font-weight: 500; }
.eyebrow.muted { color: var(--muted); }
.serif { font-weight: 600; }
.accent { color: var(--accent); }

h1, h2, h3, h4, h5 { margin: 0; letter-spacing: -0.025em; line-height: 1.02; font-weight: 600; }
h1 { font-size: clamp(48px, 7vw, 112px); font-weight: 700; }
h2 { font-size: clamp(36px, 5vw, 72px); }
h3 { font-size: clamp(24px, 3vw, 38px); line-height: 1.1; }
h4 { font-size: 22px; line-height: 1.2; }
p { margin: 0; text-wrap: pretty; }

/* === COMPONENTS === */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 6px 12px;
  border: 1px solid var(--line); border-radius: 100px;
  background: var(--bg);
}
.chip.solid { background: var(--ink); color: var(--bg); }
.chip.accent { background: var(--accent); color: #fff; border-color: var(--accent); }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 22px;
  background: var(--ink); color: var(--bg);
  border: 1px solid var(--ink); border-radius: 100px;
  text-decoration: none;
  font-weight: 500; font-size: 15px;
  cursor: pointer;
  transition: transform 0.15s;
  font-family: var(--font);
}
.btn:hover { transform: translateY(-1px); }
.btn-accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); }

.card {
  border: 1px solid var(--line); border-radius: 16px;
  background: var(--paper);
  padding: 28px;
}

/* Tweaks panel */
.tweaks-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.18); z-index: 199; opacity: 0; pointer-events: none; transition: opacity 200ms ease; }
.tweaks-overlay.open { opacity: 1; pointer-events: auto; }
.tweaks { position: fixed; right: 20px; bottom: 90px; z-index: 200; background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 22px 18px 18px; width: 240px; box-shadow: 0 30px 60px -20px rgba(0,0,0,0.25); display: none; }
.tweaks.open { display: block; }
.tweaks-close { position: absolute; top: 10px; right: 10px; background: transparent; border: 0; color: var(--muted); width: 24px; height: 24px; border-radius: 50%; cursor: pointer; font-size: 13px; line-height: 1; display: grid; place-items: center; }
.tweaks-close:hover { background: var(--bg-2); color: var(--ink); }
.tweaks h5 { margin: 0 0 12px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); font-weight: 500; }
.theme-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.theme-btn { border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; background: var(--bg); cursor: pointer; font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; display: flex; align-items: center; gap: 8px; color: var(--ink); }
.theme-btn .swatch { width: 12px; height: 12px; border-radius: 3px; border: 1px solid var(--line-soft); }
.theme-btn.active { background: var(--ink); color: var(--bg); }

/* Responsive */
@media (max-width: 760px) {
  .pb-page { padding: 28px 18px 100px; }
  .pb-top-row { padding: 12px 16px; gap: 12px; }
  .pb-bottom-row { padding: 12px 16px; gap: 8px; }
  .pb-nav-btn { padding: 10px 16px; font-size: 13px; }
  .pb-nav-btn .full-label { display: none; }
  .pb-chapter-label { font-size: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01s !important; transition-duration: 0.01s !important; }
}