/* ============================================================================
   bb-base.css — BLACKBOOK · tokens / reset / type / texture / motion
   Private record aesthetics: warm near-black paper, bone ink, oxide signal.
   Everything prefixed bb- / --bb- (see STRUCTURE.md). Zero dependencies.
   ============================================================================ */

:root {
  color-scheme: dark;
  /* paper & ink */
  --bb-paper:    #0A0A09;
  --bb-ink:      #0F0F0E;
  --bb-graphite: #0F0F0E;
  --bb-ash:      #2A2723;
  --bb-bone:     #E8E2D6;
  --bb-ivory:    #F4EEE4;
  --bb-dust:     #9A9388;
  /* signals */
  --bb-oxide:    #C65A2E;
  --bb-oxide-hi: #D96B3A;
  --bb-oxide-deep: #8F3D1C;
  --bb-archive:  #6E7C86;
  --bb-proof:    #6F7A4B;
  --bb-danger:   #B3402E;
  /* derived */
  --bb-rule: 1px solid var(--bb-ash);
  --bb-rule-bone: rgba(232,226,214,.14);
  --bb-ink-dim: rgba(232,226,214,.62);
  --bb-ink-faint: rgba(232,226,214,.38);
  --bb-oxide-dim: rgba(198,90,46,.14);
  --bb-proof-dim: rgba(111,122,75,.16);
  --bb-archive-dim: rgba(110,124,134,.14);
  /* type */
  --bb-font-disp: "Archivo", "Helvetica Neue", sans-serif;
  --bb-font-body: "Archivo", "Helvetica Neue", sans-serif;
  --bb-font-serif: "Newsreader", Georgia, serif;
  --bb-font-mono: "IBM Plex Mono", "Courier New", monospace;
  /* rhythm */
  --bb-maxw: 1240px;
  --bb-pad: clamp(20px, 4.4vw, 72px);
  --bb-gap: clamp(40px, 6vw, 96px);
  --bb-ease: cubic-bezier(.22,.61,.21,1);
  --bb-ease-stamp: cubic-bezier(.16,1,.3,1);
}

[data-accent="gold"], [data-accent="amber"] {
  --bb-oxide:      #E5A93C;
  --bb-oxide-hi:   #F2C94C;
  --bb-oxide-deep: #B57F22;
  --bb-oxide-dim:  rgba(229, 169, 60, 0.18);
}

[data-accent="neon"], [data-accent="purple"] {
  --bb-oxide:      #B967FF;
  --bb-oxide-hi:   #D8B4FE;
  --bb-oxide-deep: #7E22CE;
  --bb-oxide-dim:  rgba(185, 103, 255, 0.22);
}

[data-accent="sovereign"] {
  --bb-oxide:      #C5A059;
  --bb-oxide-hi:   #D4AF37;
  --bb-oxide-deep: #8E7033;
  --bb-oxide-dim:  rgba(197, 160, 89, 0.2);
}

[data-accent="champagne"] {
  --bb-oxide:      #F3E5AB;
  --bb-oxide-hi:   #FFF5C0;
  --bb-oxide-deep: #BFA868;
  --bb-oxide-dim:  rgba(243, 229, 171, 0.22);
}

/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: clip; scrollbar-gutter: stable; }
body {
  margin: 0;
  width: 100%;
  overflow-x: clip;
  background: var(--bb-paper);
  color: var(--bb-bone);
  font-family: var(--bb-font-body);
  font-size: 16.5px;
  line-height: 1.66;
  font-weight: 400;
  letter-spacing: .002em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
::selection { background: var(--bb-oxide); color: var(--bb-paper); }
:focus-visible { outline: 2px solid var(--bb-oxide); outline-offset: 3px; }

/* ---- paper grain overlay (analog floor under everything) ---- */
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 4000;
  opacity: .05;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.6'/></svg>");
}

/* ---- layout ---- */
.bb-container { width: 100%; max-width: var(--bb-maxw); margin: 0 auto; padding: 0 var(--bb-pad); }
.bb-section { padding: clamp(72px, 9vw, 128px) 0; position: relative; }
.bb-section--graphite,
.bb-section--ink {
  background: var(--bb-ink);
}
.bb-section--rule-top { border-top: var(--bb-rule); }

/* ---- typography ---- */
h1, h2, h3, h4 {
  font-family: var(--bb-font-disp);
  font-weight: 800;
  font-stretch: 105%;
  letter-spacing: -.022em;
  line-height: 1.02;
  margin: 0;
  color: var(--bb-ivory);
  text-wrap: balance;
}
h1 { font-size: clamp(2.6rem, 6.4vw, 5rem); }
h2 { font-size: clamp(1.9rem, 3.9vw, 3.1rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.45rem); font-weight: 700; letter-spacing: -.012em; }
p { margin: .6rem 0; color: var(--bb-ink-dim); max-width: 62ch; }

/* serif — editorial voice */
.bb-serif, .bb-serif-i {
  font-family: var(--bb-font-serif);
  font-weight: 500;
  font-optical-sizing: auto;
  letter-spacing: -.008em;
}
.bb-serif-i { font-style: italic; }

/* mono — the record voice */
.bb-mono {
  font-family: var(--bb-font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  line-height: 1.5;
}
.bb-mono--sm { font-size: .64rem; letter-spacing: .18em; }

/* labels & overlines */
.bb-label {
  font-family: var(--bb-font-mono);
  font-size: .68rem; font-weight: 600;
  letter-spacing: .22em; text-transform: uppercase;
  color: var(--bb-oxide);
}
.bb-label--archive { color: var(--bb-archive); }
.bb-label--proof { color: var(--bb-proof); }

/* section index header — "§ 03 · VERTICALS ───── FILE 03/10" */
.bb-sec-head { border-top: 0; padding-top: 0; margin-bottom: clamp(2.4rem, 4vw, 3.6rem); text-align: center; }
.bb-sec-head__row { display: flex; justify-content: center; align-items: baseline; gap: 1.5rem; flex-wrap: wrap; text-align: center; }
.bb-sec-head__index { font-family: var(--bb-font-mono); font-size: .72rem; font-weight: 600; letter-spacing: .2em; color: var(--bb-oxide); text-transform: uppercase; }
.bb-sec-head__index em { font-style: normal; color: var(--bb-ink-faint); }
.bb-sec-head__file { font-family: var(--bb-font-mono); font-size: .64rem; letter-spacing: .18em; color: var(--bb-archive); text-transform: uppercase; }
.bb-sec-head h2 { margin: 1.1rem auto 0; max-width: 32ch; text-align: center; }
.bb-sec-head__sub { margin: .9rem auto 0; font-size: 1.15rem; line-height: 1.65; color: #d6d1c7; max-width: 68ch; text-align: center; }

/* ---- ruled sheet texture (record paper) ---- */
.bb-ruled {
  background-image: repeating-linear-gradient(to bottom, transparent 0 27px, rgba(232,226,214,.055) 27px 28px);
}
/* punched binder holes down the left edge */
.bb-punched {
  background-image:
    radial-gradient(circle 4.5px at 50% 50%, var(--bb-paper) 96%, var(--bb-ash) 100%);
  background-repeat: repeat-y;
  background-size: 30px 84px;
  background-position: 0 12px;
}

/* ---- stamps (classification marks) ---- */
.bb-stamp {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--bb-font-mono);
  font-size: .62rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  height: 24px;
  padding: 4px .75em 0 .75em;
  border: 1px solid currentColor;
  border-radius: 4px;
  box-sizing: border-box;
  position: relative;
  line-height: 1;
  transform: none;
  white-space: nowrap;
  user-select: none;
}
.bb-stamp::after { display: none; }
.bb-stamp--proof { color: var(--bb-proof); }
.bb-stamp--oxide { color: var(--bb-oxide); }
.bb-stamp--archive { color: var(--bb-archive); }
.bb-stamp--danger { color: var(--bb-danger); }
.bb-stamp--static { transform: none; }

/* ---- tags (metadata chips) ---- */
.bb-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--bb-font-mono);
  font-size: .62rem; font-weight: 500;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--bb-ink-dim);
  border: 1px solid var(--bb-ash);
  border-bottom-color: var(--bb-rule-bone);
  height: 22px;
  padding: 4.5px .65em 0 .65em;
  border-radius: 3px;
  box-sizing: border-box;
  line-height: 1;
  white-space: nowrap;
}
.bb-tag--oxide { color: var(--bb-oxide-hi); border-color: rgba(198,90,46,.4); }
.bb-tag--archive { color: var(--bb-archive); border-color: rgba(110,124,134,.35); }
.bb-tag--proof { color: var(--bb-proof); border-color: rgba(111,122,75,.4); }

/* ---- index tab (filed record tab) ---- */
.bb-tab {
  display: inline-block;
  font-family: var(--bb-font-mono);
  font-size: .64rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase;
  color: var(--bb-paper);
  background: var(--bb-dust);
  padding: .38em .9em .34em .95em;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}
.bb-tab--oxide { background: var(--bb-oxide); }
.bb-tab--archive { background: var(--bb-archive); }

/* ---- margin note (handwritten-in-the-records voice) ---- */
.bb-mnote {
  font-family: var(--bb-font-serif);
  font-style: italic;
  font-size: .95rem;
  line-height: 1.45;
  color: var(--bb-oxide-hi);
  letter-spacing: 0;
}

/* ---- redaction ---- */
.bb-redact-text { color: var(--bb-ink-faint); letter-spacing: .06em; }
.bb-redact-bar {
  position: absolute; inset: 2px -2px 2px -2px;
  background: var(--bb-bone);
  transform-origin: right center;
  transition: transform .55s var(--bb-ease);
  transition-delay: calc(var(--bb-i, 0) * 110ms);
}
.is-in .bb-redact-bar { transform: scaleX(0); }

/* ---- buttons ---- */
.bb-btn {
  display: inline-flex; align-items: center; gap: .6em;
  font-family: var(--bb-font-mono);
  font-size: .74rem; font-weight: 600;
  letter-spacing: .16em; text-transform: uppercase;
  padding: 1em 1.5em .95em 1.55em;
  clip-path: polygon(0 0, calc(100% - 11px) 0, 100% 11px, 100% 100%, 0 100%);
  transition: background .18s var(--bb-ease), color .18s var(--bb-ease), transform .18s var(--bb-ease), border-color .18s var(--bb-ease);
  user-select: none;
  white-space: nowrap;
}
.bb-btn--file { background: var(--bb-oxide); color: var(--bb-paper); }
.bb-btn--file:hover { background: var(--bb-oxide-hi); transform: translateX(2px); }
.bb-btn--file:active { background: var(--bb-oxide-deep); transform: translateX(2px) translateY(1px); }
.bb-btn--ink { background: rgba(255, 255, 255, 0.09); border: 1px solid rgba(255, 255, 255, 0.18); color: var(--bb-ivory); }
.bb-btn--ink:hover { background: rgba(255, 255, 255, 0.17); border-color: rgba(255, 255, 255, 0.35); color: #ffffff; transform: translateX(2px); }
.bb-btn--bone { background: var(--bb-bone); color: var(--bb-paper); }
.bb-btn--bone:hover { background: var(--bb-ivory); transform: translateX(2px); }
.bb-btn--lg { padding: 1.15em 1.8em 1.1em 1.85em; font-size: .78rem; }
.bb-btn [data-bb-icon] { width: 15px; height: 15px; }

/* drawn-underline text link */
.bb-ul {
  position: relative;
  display: inline-block;
  color: var(--bb-ivory);
}
.bb-ul::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -3px; height: 1px;
  background: var(--bb-oxide);
  transform: scaleX(0); transform-origin: left;
  transition: transform .3s var(--bb-ease);
}
.bb-ul:hover::after, .bb-ul:focus-visible::after { transform: scaleX(1); }

/* ---- icons (sprite injected by bb.js) ---- */
[data-bb-icon] { display: inline-block; width: 22px; height: 22px; flex: none; }
[data-bb-icon] svg { width: 100%; height: 100%; stroke: currentColor; fill: none; stroke-linecap: square; stroke-linejoin: miter; }

/* ============================================================================
   MOTION PRIMITIVES — analog-digital, restrained (spec: MOTION-NOTES.md)
   Elements get data-anim="…" ; bb.js adds .is-in when scrolled into view.
   ============================================================================ */
[data-anim],
[data-reveal] {
  opacity: 0;
  will-change: opacity, transform;
}
[data-anim="meta"],
[data-reveal] {
  transform: translate3d(0, 36px, 0);
  transition: opacity 0.95s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.95s cubic-bezier(0.22, 1, 0.36, 1);
}
[data-anim="tab"] {
  transform: translate3d(0, 36px, 0);
  transition: opacity 0.95s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.95s cubic-bezier(0.22, 1, 0.36, 1);
}
[data-anim="rule"] {
  opacity: 1;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}
[data-anim="stamp"] {
  transform: rotate(-9deg) scale(1.4);
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
[data-anim="note"] {
  opacity: 0;
  transform: translate3d(0, 18px, 0) rotate(-0.4deg);
  transition: opacity 0.85s 0.15s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.85s 0.15s cubic-bezier(0.22, 1, 0.36, 1);
}
[data-anim].is-in,
[data-reveal].is-in {
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1) rotate(0deg);
}
[data-anim="stamp"].is-in {
  opacity: 1;
  transform: rotate(-9deg) scale(1);
}
[data-anim="note"].is-in {
  opacity: 1;
  transform: translate3d(0, 0, 0) rotate(-0.4deg);
}
/* per-element stagger: inline style="--bb-i:n" (after pattern defs so it overrides shorthand delays) */
[data-anim],
[data-reveal] { transition-delay: calc(var(--bb-i, 0) * 100ms); }
/* anchor targets clear the sticky masthead */
[id] { scroll-margin-top: 92px; }
/* stagger: inline style="--bb-i:n" on children of a [data-anim-stagger] parent */
[data-anim-stagger] > * { transition-delay: calc(var(--bb-i, 0) * 100ms); }
/* svg line drawing */
.bb-draw { stroke-dasharray: var(--bb-len, 400); stroke-dashoffset: var(--bb-len, 400); transition: stroke-dashoffset 1.1s var(--bb-ease); }
.bb-draw.is-in { stroke-dashoffset: 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-anim], [data-reveal], [data-anim-stagger] > * { opacity: 1 !important; transform: none !important; transition: none !important; }
  .bb-draw { stroke-dashoffset: 0 !important; transition: none; }
  .bb-redact-bar { transform: scaleX(0) !important; transition: none; }
}

/* svg accent lines follow the oxide token */
.bb-process__line path { stroke: var(--bb-oxide); }
.bb-match svg path:nth-of-type(1) { stroke: var(--bb-oxide); }
.bb-match svg path:nth-of-type(2) { stroke: var(--bb-archive); }

/* ---- misc utilities ---- */
.bb-center { text-align: center; }
.bb-hide-sm { display: initial; }
@media (max-width: 720px) { .bb-hide-sm { display: none !important; } }