/* ==========================================================================
   Branding and Identity: page-only styles
   Concept: "brand spec sheet". Type specimens, colour chips and logo
   construction lines drawn in CSS/SVG, layered on the shared light system.
   Reads shared tokens only; no new colours beyond the illustrative swatches.
   ========================================================================== */

/* ---------- Hero ---------- */
.bi-hero__index {
  list-style: none; margin: 2.5rem 0 0; padding: 1.25rem 0 0; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: .6rem 1.6rem;
  font-family: var(--f-mono); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--c-text);
}
.bi-hero__index li { display: inline-flex; align-items: baseline; gap: .45rem; }
.bi-hero__index span { color: var(--c-accent); font-size: .62rem; }

.bi-hero__media { padding-bottom: 3.5rem; }
.bi-spec {
  position: absolute; left: clamp(-1.5rem, -2vw, -.5rem); bottom: 0; z-index: 4;
  display: grid; grid-template-columns: auto 1fr; align-items: center; gap: .9rem 1.2rem;
  padding: 1rem 1.2rem; border-radius: 20px; width: min(320px, 82%);
}
.bi-spec__type { display: flex; align-items: center; gap: .75rem; }
.bi-spec__aa { font-family: var(--f-display); font-weight: 800; font-size: 2.6rem; line-height: 1; letter-spacing: -0.05em; color: var(--c-text); }
.bi-spec__meta { display: grid; font-family: var(--f-mono); font-size: .6rem; letter-spacing: .14em; text-transform: uppercase; color: var(--c-text-muted); line-height: 1.6; }
.bi-spec__swatches { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; justify-self: end; width: 100%; max-width: 128px; }
.bi-spec__swatches span { aspect-ratio: 1; border-radius: 6px; background: var(--sw); box-shadow: inset 0 0 0 1px var(--line); }
.bi-spec__label { grid-column: 1 / -1; padding-top: .7rem; border-top: 1px solid var(--line); font-family: var(--f-mono); font-size: .62rem; letter-spacing: .16em; text-transform: uppercase; color: var(--c-text-muted); display: flex; align-items: center; gap: .5rem; }
.bi-spec__label::before { content: ""; width: 7px; height: 7px; background: var(--c-signal-btn); }

/* ---------- Overview brand board ---------- */
.bi-board {
  position: relative; margin: 0;
  display: grid; gap: 12px; grid-template-columns: 1fr 1fr;
  grid-template-areas: "logo type" "logo colour" "voice voice" "cap cap";
}
.bi-board > .px-cluster { top: -22px; right: 18px; }
.bi-board__cell {
  position: relative; background: var(--c-surface); border: 1px solid var(--card-bd); border-radius: var(--r-card);
  box-shadow: var(--shadow-soft); padding: clamp(1rem, 2.2vw, 1.5rem); overflow: hidden; min-width: 0;
}
.bi-board__tag { display: inline-flex; align-items: center; gap: .45rem; font-family: var(--f-mono); font-size: .62rem; letter-spacing: .16em; text-transform: uppercase; color: var(--c-text-muted); }
.bi-board__tag::before { content: ""; width: 6px; height: 6px; background: var(--c-signal-btn); }
.bi-board__logo { grid-area: logo; display: flex; flex-direction: column; }
.bi-board__logo svg { width: 100%; height: auto; margin-top: auto; padding-top: 1rem; overflow: visible; }
.bi-grid { fill: none; stroke: var(--line-strong); stroke-width: .8; stroke-dasharray: 3 4; }
.bi-mark { fill: var(--c-text); }
.bi-mark--soft { fill: var(--c-signal-btn); }
.bi-stroke { fill: none; stroke: var(--c-signal); stroke-width: 7; stroke-linecap: square; stroke-linejoin: miter; }
.bi-board__type { grid-area: type; }
.bi-board__specimen { margin: .4rem 0 0; font-family: var(--f-display); font-weight: 800; font-size: clamp(3.4rem, 2rem + 4vw, 5.6rem); line-height: .95; letter-spacing: -0.06em; color: var(--c-text); }
.bi-board__glyphs { margin: .5rem 0 0; font-family: var(--f-display); font-weight: 600; font-size: .78rem; letter-spacing: .02em; line-height: 1.5; color: var(--c-text-muted); word-break: break-all; }
.bi-board__fonts { margin: .9rem 0 0; display: grid; gap: .35rem; }
.bi-board__fonts div { display: flex; justify-content: space-between; gap: .5rem; padding-top: .35rem; border-top: 1px solid var(--line); font-size: .78rem; }
.bi-board__fonts dt { font-family: var(--f-mono); font-size: .62rem; letter-spacing: .14em; text-transform: uppercase; color: var(--c-text-muted); }
.bi-board__fonts dd { margin: 0; font-weight: 700; color: var(--c-text); text-align: right; }
.bi-board__colour { grid-area: colour; }
.bi-chips { list-style: none; margin: .8rem 0 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.bi-chips li {
  background: var(--sw); color: var(--fg); border-radius: 10px; padding: .55rem .6rem; min-height: 64px;
  display: flex; flex-direction: column; justify-content: space-between; box-shadow: inset 0 0 0 1px var(--line);
  transition: transform var(--t-med) var(--ease-spring);
}
.bi-chips li:hover { transform: translateY(-3px); }
.bi-chips span { font-weight: 700; font-size: .78rem; }
.bi-chips code { font-family: var(--f-mono); font-size: .6rem; letter-spacing: .08em; opacity: .85; }
.bi-board__voice { grid-area: voice; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .5rem 1.5rem; }
.bi-board__voice p { margin: 0; font-family: var(--f-display); font-weight: 800; font-size: clamp(1.3rem, .9rem + 1.6vw, 2.1rem); letter-spacing: -0.035em; line-height: 1.05; }
.bi-board__cap { grid-area: cap; display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem; padding-top: .25rem; }
.bi-board__cap .mono { font-size: .62rem; }

/* ---------- Bento extras ---------- */
.bi-logo-card__art { display: flex; flex-wrap: wrap; gap: 10px; }
.bi-lockup {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 16px; border-radius: 12px; min-width: 0;
  border: 1px solid var(--card-bd); background: var(--c-bg); transition: transform .5s var(--ease-spring);
}
.bi-lockup i { width: 22px; height: 22px; background: var(--c-text); position: relative; }
.bi-lockup i::after { content: ""; position: absolute; width: 9px; height: 9px; right: -12px; top: -10px; background: var(--c-signal-btn); }
.bi-lockup b { width: 64px; height: 8px; border-radius: 2px; background: var(--c-text); box-shadow: 0 13px 0 -2px var(--line-strong); }
.bi-lockup--ink { background: var(--c-obsidian); border-color: var(--c-obsidian); }
.bi-lockup--ink i, .bi-lockup--ink b { background: var(--c-ivory); }
.bi-lockup--ink b { box-shadow: 0 13px 0 -2px rgba(246,242,239,.3); }
.bi-lockup--signal { background: var(--c-signal-btn); border-color: var(--c-signal-btn); }
.bi-lockup--signal i, .bi-lockup--signal b { background: #fff; }
.bi-lockup--signal i::after { background: var(--c-obsidian); }
.bi-lockup--signal b { box-shadow: 0 13px 0 -2px rgba(255,255,255,.45); }
.bi-lockup--line { background: transparent; border-style: dashed; border-color: var(--line-input); }
.bi-lockup--line i { background: transparent; box-shadow: inset 0 0 0 2px var(--c-text); }
.bi-lockup--line b { background: transparent; box-shadow: inset 0 0 0 1.5px var(--c-text); height: 10px; }
.bi-logo-card:hover .bi-lockup--ink { transform: translateY(-4px) rotate(-1.5deg); }
.bi-logo-card:hover .bi-lockup--signal { transform: translateY(-6px); }
.bi-logo-card:hover .bi-lockup--line { transform: translateY(-4px) rotate(1.5deg); }

.bi-guide-card .bento__media { aspect-ratio: 16/10; }
.bi-toc { list-style: none; margin: .25rem 0 0; padding: 0; display: grid; }
.bi-toc li { display: flex; gap: .75rem; align-items: baseline; padding: .55rem 0; border-top: 1px solid var(--line); font-size: .9rem; font-weight: 500; color: var(--c-text-soft); }
.bi-toc span { font-family: var(--f-mono); font-size: .64rem; letter-spacing: .12em; color: var(--c-accent); }

.bi-mini-swatch { display: flex; gap: 0; height: 14px; border-radius: 999px; overflow: hidden; box-shadow: inset 0 0 0 1px var(--line); }
.bi-mini-swatch span { flex: 1; background: var(--sw); transition: flex .5s var(--ease-out); }
.card:hover .bi-mini-swatch span:nth-child(2) { flex: 2.4; }

.bi-quote { margin: 0; padding-left: 1rem; border-left: 2px solid var(--c-signal-btn); font-family: var(--f-display); font-weight: 600; font-size: clamp(1rem, .9rem + .4vw, 1.2rem); line-height: 1.35; letter-spacing: -0.02em; color: var(--c-text); max-width: 34ch; }
.bi-touch { list-style: none; margin: 0; padding: 0; }

/* ---------- Moodboard gallery ---------- */
.bi-mood { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
.bi-mood__item { position: relative; display: block; border-radius: var(--r-card); overflow: hidden; min-width: 0; }
.bi-mood__item--a { grid-column: 1 / -1; aspect-ratio: 3/2; }
.bi-mood__item--b { grid-row: span 2; aspect-ratio: auto; }
.bi-mood__item--c, .bi-mood__item--d { aspect-ratio: 4/3; }
.bi-mood__swatch {
  display: flex; flex-direction: column; justify-content: space-between; padding: 1rem; aspect-ratio: 1;
  background: var(--c-obsidian); color: var(--c-ivory);
}
.bi-mood__aa { font-family: var(--f-display); font-weight: 800; font-size: clamp(2.6rem, 1.5rem + 4vw, 5rem); line-height: .9; letter-spacing: -0.06em; }
.bi-mood__swatch .mono { font-size: .6rem; color: rgba(246,242,239,.75); }
.bi-mood__chip {
  display: flex; flex-direction: column; justify-content: flex-end; gap: .2rem; padding: 1rem; min-height: 120px;
  background: var(--c-surface); border: 1px solid var(--card-bd); box-shadow: var(--shadow-soft);
}
.bi-mood__chip .mono { font-size: .62rem; color: var(--c-text-muted); }
.bi-mood__chip code { font-family: var(--f-mono); font-size: .8rem; color: var(--c-text); }
.bi-mood__dot { position: absolute; inset: 0 0 auto 0; height: 58%; background: var(--g-signal); }

@media (min-width: 900px) {
  .bi-mood { grid-template-columns: repeat(12, 1fr); grid-auto-rows: clamp(104px, 9.5vw, 132px); gap: 16px; }
  .bi-mood > .bi-mood__item { aspect-ratio: auto; min-height: 0; }
  .bi-mood__item--a { grid-column: 1 / span 7; grid-row: 1 / span 4; }
  .bi-mood__item--b { grid-column: 8 / span 3; grid-row: 1 / span 4; }
  .bi-mood__swatch { grid-column: 11 / span 2; grid-row: 1 / span 2; }
  .bi-mood__chip { grid-column: 11 / span 2; grid-row: 3 / span 2; }
  .bi-mood__item--c { grid-column: 1 / span 5; grid-row: 5 / span 3; }
  .bi-mood__item--d { grid-column: 6 / span 7; grid-row: 5 / span 3; }
}

/* ---------- FAQ intro sticky on desktop ---------- */
@media (min-width: 900px) {
  .bi-faq-intro { position: sticky; top: var(--sticky-top); }
}

/* ---------- Small screens ---------- */
@media (max-width: 599px) {
  .bi-board { grid-template-columns: 1fr; grid-template-areas: "logo" "type" "colour" "voice" "cap"; }
  .bi-board__logo svg { max-width: 260px; margin-inline: auto; }
  .bi-spec { left: 0; width: min(300px, 92%); }
  .bi-lockup b { width: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  .bi-lockup, .bi-chips li, .bi-mini-swatch span { transition: none; }
}