/* ============================================================
   ADAAS — The Apperception Layer™ · Website layer
   Builds web layout on top of colors_and_type.css (brand tokens).
   Albert Sans only · red accent · hairlines · giant numerals.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Web-scale type (the card scale in colors_and_type.css is sized for 1080px frames) */
  --w-mega:    clamp(4rem, 13vw, 12rem);
  --w-display: clamp(2.6rem, 6.2vw, 5.4rem);
  --w-h1:      clamp(2rem, 4vw, 3.4rem);
  --w-h2:      clamp(1.5rem, 2.6vw, 2.3rem);
  --w-h3:      clamp(1.2rem, 1.7vw, 1.55rem);
  --w-lead:    clamp(1.05rem, 1.35vw, 1.3rem);
  --w-body:    1.0625rem;
  --w-sm:      0.9375rem;
  --w-xs:      0.8125rem;

  --w-gutter:  clamp(1.25rem, 5vw, 5rem);
  --w-maxw:    1280px;

  --nav-h:     76px;

  /* Accent is overridable by Tweaks */
  --accent: var(--adaas-red);
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--paper-0);
  color: var(--ink-1);
  font-weight: 400;
  overflow-x: hidden;
  line-height: 1.5;
}

a { color: inherit; }
img { max-width: 100%; display: block; }
::selection { background: var(--accent); color: #fff; }

/* ---------- Theme surfaces ----------
   Flip the design-system theme tokens (not just `color`) because
   colors_and_type.css hard-sets color:var(--fg) on h1/h2/h3/p.
   NB: deliberately do NOT set --accent here so the Tweaks accent
   (applied on :root) still cascades into dark sections. */
.surface { background: var(--paper-0); color: var(--ink-1); }
.surface--dark, .surface--ink {
  --fg: var(--paper-1);
  --fg-muted: rgba(245, 245, 245, 0.7);
  --line: var(--paper-1);
  color: var(--paper-1);
}
.surface--dark { background: var(--ink-1); }
.surface--ink { background: #161616; }
.surface--dark .ln, .surface--ink .ln { border-color: rgba(245,245,245,0.16); }
.surface--dark .muted, .surface--ink .muted { color: rgba(245,245,245,0.6); }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 200; height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--w-gutter);
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0,0,0,0.1);
  transition: background var(--dur-base) var(--ease-out), border-color var(--dur-base);
}
.nav[data-dark="true"] {
  background: rgba(22,22,22,0.78);
  border-bottom-color: rgba(245,245,245,0.12);
}
.nav-brand { display: flex; align-items: center; gap: 0.7rem; text-decoration: none; }
.nav-brand img { height: 17px; width: auto; }
.nav-brand .lock {
  font-size: var(--w-xs); letter-spacing: 0.14em; text-transform: uppercase;
  font-weight: 600; color: var(--ink-1); padding-left: 0.7rem;
  border-left: 1px solid rgba(0,0,0,0.18);
}
.nav[data-dark="true"] .nav-brand .lock { color: var(--paper-1); border-left-color: rgba(245,245,245,0.22); }
.nav-links { display: flex; gap: clamp(1rem, 2vw, 2.2rem); list-style: none; align-items: center; }
.nav-links a {
  font-size: var(--w-sm); font-weight: 500; text-decoration: none;
  color: var(--ink-2); letter-spacing: 0; transition: color var(--dur-fast);
}
.nav[data-dark="true"] .nav-links a { color: rgba(245,245,245,0.72); }
.nav-links a:hover { color: var(--accent); }
.nav-links a.is-active { color: var(--accent); }
.nav-cta {
  font-size: var(--w-sm); font-weight: 600; letter-spacing: 0;
  color: var(--paper-0); background: var(--ink-1);
  padding: 0.6rem 1.25rem; border-radius: var(--r-pill); text-decoration: none;
  display: inline-flex; align-items: center; gap: 0.5rem;
  border: 1px solid var(--ink-1); transition: all var(--dur-base) var(--ease-out);
}
.nav-cta:hover { background: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.nav[data-dark="true"] .nav-cta { background: var(--paper-1); color: var(--ink-1); border-color: var(--paper-1); }
.nav[data-dark="true"] .nav-cta:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.nav-burger { display: none; background: none; border: none; cursor: pointer; padding: 0.4rem; }
.nav-burger span { display: block; width: 22px; height: 2px; background: currentColor; margin: 4px 0; transition: 0.2s; }

/* ============================================================
   BUTTONS / CHIPS
   ============================================================ */
.btn {
  font-family: var(--font-sans); font-size: var(--w-sm); font-weight: 600;
  letter-spacing: 0; text-decoration: none; cursor: pointer;
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.95rem 1.6rem; border-radius: var(--r-pill);
  border: 1px solid transparent; transition: all var(--dur-base) var(--ease-out);
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; transition: transform var(--dur-base) var(--ease-out); }
.btn:hover svg { transform: translate(3px, -3px); }
.btn--primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn--primary:hover { background: #b62b23; border-color: #b62b23; }
.btn--solid { background: var(--ink-1); color: var(--paper-0); border-color: var(--ink-1); }
.btn--solid:hover { background: var(--accent); border-color: var(--accent); }
.btn--ghost { background: transparent; color: currentColor; border-color: currentColor; opacity: 0.9; }
.btn--ghost:hover { background: currentColor; opacity: 1; }
.btn--ghost:hover span { color: var(--paper-0); }
.surface--dark .btn--ghost:hover span, .surface--ink .btn--ghost:hover span { color: var(--ink-1); }

/* Signature corner / arrow pill */
.chip {
  display: inline-grid; place-items: center; width: 44px; height: 44px;
  border: 1px solid currentColor; border-radius: var(--r-pill);
  transition: all var(--dur-base) var(--ease-out); flex-shrink: 0;
}
.chip svg { width: 17px; height: 17px; }
a:hover > .chip, .card:hover .chip { background: var(--accent); border-color: var(--accent); color: #fff; transform: rotate(0deg); }

/* ============================================================
   SECTION SCAFFOLD
   ============================================================ */
.section { padding: clamp(4.5rem, 9vw, 9rem) var(--w-gutter); }
.section--tight { padding-top: clamp(3rem, 5vw, 5rem); padding-bottom: clamp(3rem, 5vw, 5rem); }
.wrap { max-width: var(--w-maxw); margin: 0 auto; width: 100%; }

.ln { border: 0; border-top: 1px solid rgba(0,0,0,0.16); width: 100%; }

.eyebrow {
  font-size: var(--w-xs); font-weight: 600; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent);
  display: inline-flex; align-items: center; gap: 0.7rem;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--accent); display: inline-block; }

/* Section header: giant numeral + label + title */
.shead { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(1.5rem, 4vw, 4rem); align-items: end; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.shead-num {
  font-family: var(--font-display); font-weight: 500; font-size: var(--w-mega);
  line-height: 0.8; letter-spacing: var(--track-tight); color: var(--accent);
}
.shead-num .slash { color: rgba(0,0,0,0.16); }
.surface--dark .shead-num .slash, .surface--ink .shead-num .slash { color: rgba(245,245,245,0.2); }
.title {
  font-family: var(--font-display); font-weight: 700; font-size: var(--w-display);
  line-height: 0.98; letter-spacing: var(--track-tight); text-wrap: balance;
}
.title em { font-style: italic; color: var(--accent); font-weight: 700; }
.title-sm { font-size: var(--w-h1); font-weight: 700; line-height: 1.0; letter-spacing: var(--track-tight); }

.lead { font-size: var(--w-lead); font-weight: 400; line-height: 1.55; color: var(--ink-2); max-width: 46ch; }
.surface--dark .lead, .surface--ink .lead { color: rgba(245,245,245,0.78); }
.body { font-size: var(--w-body); line-height: 1.65; color: var(--ink-2); }
.surface--dark .body, .surface--ink .body { color: rgba(245,245,245,0.72); }
.body + .body { margin-top: 1.1rem; }
.muted { color: var(--fg-muted); }

/* ============================================================
   MARQUEE
   ============================================================ */
.marquee { background: var(--ink-1); color: var(--paper-1); padding: 0.85rem 0; overflow: hidden; border-block: 1px solid var(--ink-1); }
.marquee-track { display: flex; gap: 2.5rem; width: max-content; animation: marquee 36s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-item { font-size: var(--w-xs); font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: rgba(245,245,245,0.55); display: inline-flex; align-items: center; gap: 2.5rem; }
.marquee-item b { color: var(--accent); font-weight: 700; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ============================================================
   SCROLL REVEAL
   Transform-only (opacity stays 1) so content is NEVER hidden
   if a transition can't run — e.g. a backgrounded/throttled tab
   where requestAnimationFrame is paused. Motion is enhancement.
   ============================================================ */
.reveal { transform: translateY(22px); transition: transform 0.7s var(--ease-out); }
.reveal.in { transform: none; }
.reveal[data-d="1"] { transition-delay: 0.06s; }
.reveal[data-d="2"] { transition-delay: 0.12s; }
.reveal[data-d="3"] { transition-delay: 0.18s; }
.reveal[data-d="4"] { transition-delay: 0.24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { transform: none; transition: none; }
  .marquee-track { animation: none; }
}

/* ============================================================
   CARDS / GRID PRIMITIVES
   ============================================================ */
.grid-rule { display: grid; gap: 1px; background: rgba(0,0,0,0.16); border: 1px solid rgba(0,0,0,0.16); }
.surface--dark .grid-rule, .surface--ink .grid-rule { background: rgba(245,245,245,0.16); border-color: rgba(245,245,245,0.16); }
.cell { background: var(--paper-0); padding: clamp(1.6rem, 2.5vw, 2.5rem); }
.surface--dark .cell { background: var(--ink-1); }
.surface--ink .cell { background: #161616; }

/* Article / use-case card */
.card {
  display: flex; flex-direction: column; text-decoration: none; color: inherit;
  background: var(--paper-0); border: 1px solid rgba(0,0,0,0.14);
  border-radius: var(--r-md); overflow: hidden;
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-base);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); border-color: rgba(0,0,0,0.28); }
.surface--dark .card, .surface--ink .card { background: #1c1c1c; border-color: rgba(245,245,245,0.14); }
.surface--dark .card:hover, .surface--ink .card:hover { border-color: rgba(245,245,245,0.3); box-shadow: 0 20px 50px rgba(0,0,0,0.5); }
.card-media { width: 100%; aspect-ratio: 16 / 10; background: var(--paper-4); }
.card-body { padding: clamp(1.3rem, 2vw, 1.8rem); display: flex; flex-direction: column; gap: 0.7rem; flex: 1; }
.card-tag { font-size: var(--w-xs); font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); }
.card-title { font-family: var(--font-display); font-weight: 700; font-size: var(--w-h3); line-height: 1.12; letter-spacing: -0.01em; }
.card-excerpt { font-size: var(--w-sm); line-height: 1.55; color: var(--ink-2); }
.surface--dark .card-excerpt, .surface--ink .card-excerpt { color: rgba(245,245,245,0.62); }
.card-foot { margin-top: auto; padding-top: 0.6rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.card-meta { font-size: var(--w-xs); color: var(--fg-muted); letter-spacing: 0.02em; }
.surface--dark .card-meta, .surface--ink .card-meta { color: rgba(245,245,245,0.5); }

/* ============================================================
   FOOTER
   ============================================================ */
.footer { background: var(--ink-1); color: var(--paper-1); padding: clamp(3.5rem, 6vw, 6rem) var(--w-gutter) 2.5rem; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2rem; padding-bottom: 3rem; border-bottom: 1px solid rgba(245,245,245,0.14); }
.footer img { height: 22px; margin-bottom: 1.3rem; }
.footer-blurb { font-size: var(--w-sm); line-height: 1.6; color: rgba(245,245,245,0.6); max-width: 34ch; }
.footer-col h4 { font-size: var(--w-xs); letter-spacing: 0.14em; text-transform: uppercase; color: rgba(245,245,245,0.45); margin-bottom: 1.1rem; font-weight: 600; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.7rem; }
.footer-col a { font-size: var(--w-sm); color: rgba(245,245,245,0.78); text-decoration: none; transition: color var(--dur-fast); }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-top: 2rem; flex-wrap: wrap; }
.footer-bottom small { font-size: var(--w-xs); color: rgba(245,245,245,0.45); line-height: 1.6; }

/* ============================================================
   PAGE HEADER (blog / use-cases index)
   ============================================================ */
.page-head { padding: calc(var(--nav-h) + clamp(3rem, 7vw, 6rem)) var(--w-gutter) clamp(2.5rem, 5vw, 4rem); }
.page-head .title { max-width: 18ch; }
.page-head .lead { margin-top: 1.5rem; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .shead { grid-template-columns: 1fr; align-items: start; gap: 1.2rem; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--ink-1); padding: 1.5rem var(--w-gutter); gap: 1.2rem; align-items: flex-start;
    border-bottom: 1px solid rgba(245,245,245,0.14);
  }
  .nav-links.open a { color: var(--paper-1); font-size: 1.05rem; }
  .nav-burger { display: block; color: inherit; }
  .nav[data-dark="true"] .nav-burger { color: var(--paper-1); }
  .footer-top { grid-template-columns: 1fr; gap: 2.2rem; }
}