/* =====================================================================
   DETAILED IN DESIGN — PORTABLE DESIGN KIT  (did-kit.css)
   Framework-agnostic cinematic design system matching detailedindesign.com.
   Drop into any product subdomain landing page:
     <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Inter:wght@300..800&family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap">
     <link rel="stylesheet" href="/did-kit/did-kit.css">
     <canvas class="did-canvas"></canvas>          (optional animated backdrop)
     <script src="/did-kit/did-backdrop.js" defer></script>
   ===================================================================== */

:root {
  --did-bg: #020A19;
  --did-bg-raised: #04101F;
  --did-bg-overlay: rgba(2, 10, 25, 0.92);
  --did-blue-deep: #0B3FBF;
  --did-blue: #1E6FFF;
  --did-blue-mid: #4D9FFF;
  --did-blue-glow: #6EC1FF;
  --did-blue-ice: #A8D8FF;
  --did-text: #F4F8FF;
  --did-text-dim: #93A7C4;
  --did-text-mute: #5C708F;
  --did-line: rgba(110, 193, 255, 0.12);
  --did-glow-sm: 0 0 12px rgba(30, 111, 255, 0.35);
  --did-glow-md: 0 0 28px rgba(30, 111, 255, 0.28);
  --did-font-display: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --did-font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --did-font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

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

body.did {
  margin: 0;
  background-color: var(--did-bg);
  color: var(--did-text);
  font-family: var(--did-font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
body.did ::selection { background: rgba(30, 111, 255, 0.35); color: #fff; }

/* fixed animated canvas backdrop + vignette + grain */
.did-canvas { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
.did-vignette { position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background: radial-gradient(120% 90% at 50% 42%, transparent 42%, rgba(2,6,16,0.55) 100%); }
.did-grain::after { content: ''; position: fixed; inset: 0; z-index: 2; pointer-events: none; opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E"); }
.did-shell { position: relative; z-index: 3; }

/* typography */
.did-display { font-family: var(--did-font-display); }
.did-mono { font-family: var(--did-font-mono); }
.did-eyebrow { font-family: var(--did-font-mono); font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.3em; text-transform: uppercase; color: var(--did-blue-glow); }
.did-h1 { font-family: var(--did-font-display); font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.04em; line-height: 0.98; font-size: clamp(2.4rem, 6.4vw, 5rem); color: var(--did-text); margin: 0; }
.did-h2 { font-family: var(--did-font-display); font-weight: 600; letter-spacing: 0.02em;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem); color: var(--did-text); margin: 0; }
.did-accent { color: var(--did-blue); text-shadow: 0 0 28px rgba(30, 111, 255, 0.5); }
.did-lead { font-size: clamp(1rem, 1.3vw, 1.15rem); line-height: 1.7; color: var(--did-text-dim); max-width: 56ch; }
.did-mono-label { font-family: var(--did-font-mono); font-size: 0.68rem; font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase; color: var(--did-blue-glow); }

/* layout helpers */
.did-container { width: 100%; max-width: 1180px; margin: 0 auto; padding-left: 1.5rem; padding-right: 1.5rem; }
.did-section { padding: clamp(4rem, 10vh, 8rem) 0; }
.did-hairline { height: 1px; background: linear-gradient(90deg, transparent, var(--did-line), transparent); border: 0; }

/* nav chrome */
.did-nav { position: fixed; left: 0; right: 0; top: 0; z-index: 50; display: flex; align-items: center;
  justify-content: space-between; padding: 1.1rem clamp(1.25rem, 4vw, 2.5rem); transition: background .4s, padding .4s; }
.did-nav.scrolled { background: rgba(2,10,25,0.7); backdrop-filter: blur(18px); padding-top: .7rem; padding-bottom: .7rem; }
.did-brand { display: flex; align-items: center; gap: .7rem; color: var(--did-text); text-decoration: none; }
.did-brand img, .did-brand svg { height: 38px; width: 38px; }
.did-brand-name { font-family: var(--did-font-display); font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.2em; font-size: 0.85rem; }
.did-chip { display: inline-flex; align-items: center; gap: .45rem; padding: .5rem 1rem; border-radius: 999px;
  border: 1px solid var(--did-line); background: rgba(2,10,25,0.4); backdrop-filter: blur(10px);
  font-family: var(--did-font-mono); font-size: .68rem; font-weight: 500; letter-spacing: .16em;
  text-transform: uppercase; color: var(--did-text-dim); text-decoration: none; transition: color .3s, border-color .3s, background .3s; }
.did-chip:hover { color: #fff; border-color: var(--did-blue); background: rgba(30,111,255,0.12); }

/* pill buttons */
.did-pill { display: inline-flex; align-items: center; gap: .55rem; padding: .85rem 1.6rem; border-radius: 999px;
  font-family: var(--did-font-mono); font-size: .74rem; font-weight: 500; letter-spacing: .18em;
  text-transform: uppercase; color: var(--did-text); border: 1px solid var(--did-line);
  background: rgba(30,111,255,0.04); text-decoration: none; cursor: pointer;
  transition: border-color .35s, background .35s, box-shadow .35s, transform .35s; }
.did-pill:hover { border-color: var(--did-blue); background: rgba(30,111,255,0.1); box-shadow: var(--did-glow-sm); transform: translateY(-1px); }
.did-pill-primary { color: #fff; border-color: transparent;
  background: linear-gradient(135deg, var(--did-blue-deep), var(--did-blue)); box-shadow: 0 10px 40px rgba(11,63,191,0.4); }
.did-pill-primary:hover { background: linear-gradient(135deg, var(--did-blue), var(--did-blue-glow)); box-shadow: 0 14px 52px rgba(30,111,255,0.5); }

/* cards / grids */
.did-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.did-card { border: 1px solid var(--did-line); border-radius: 18px; padding: 1.6rem;
  background: linear-gradient(180deg, rgba(110,193,255,0.05), rgba(2,10,25,0.4)); backdrop-filter: blur(12px);
  transition: border-color .4s, transform .4s, box-shadow .4s; }
.did-card:hover { border-color: rgba(30,111,255,0.45); transform: translateY(-4px); box-shadow: var(--did-glow-md); }
.did-card h3 { font-family: var(--did-font-display); color: var(--did-text); margin: 0 0 .4rem; }
.did-card p { color: var(--did-text-dim); line-height: 1.6; margin: 0; font-size: .95rem; }

/* footer */
.did-footer { position: relative; z-index: 3; border-top: 1px solid var(--did-line); background: var(--did-bg);
  padding: 3rem 0; color: var(--did-text-mute); font-size: .85rem; }
.did-footer a { color: var(--did-text-dim); text-decoration: none; }
.did-footer a:hover { color: var(--did-blue-glow); }

/* scroll reveal (did-backdrop.js toggles .is-in) */
.did-reveal { opacity: 0; transform: translateY(28px); filter: blur(5px);
  transition: opacity 1s cubic-bezier(.22,1,.36,1), transform 1s cubic-bezier(.22,1,.36,1), filter 1s cubic-bezier(.22,1,.36,1); }
.did-reveal.is-in { opacity: 1; transform: none; filter: none; }

@media (prefers-reduced-motion: reduce) {
  .did-reveal { opacity: 1; transform: none; filter: none; transition: none; }
}

/* ---- text-size accessibility control (bottom-left) ---- */
.did-text-size {
  position: fixed; left: 1rem; bottom: 1rem; z-index: 60;
  display: inline-flex; align-items: center; gap: 1px; padding: 3px;
  border-radius: 999px; border: 1px solid var(--did-line);
  background: rgba(2, 10, 25, 0.6); backdrop-filter: blur(10px);
}
.did-text-size button {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 30px; height: 30px; padding: 0 0.4rem; border: none; border-radius: 999px;
  background: transparent; color: var(--did-text-dim); font-family: var(--did-font-mono);
  font-weight: 600; cursor: pointer; transition: color 0.25s ease, background 0.25s ease;
}
.did-text-size button:nth-child(1) { font-size: 0.72rem; }
.did-text-size button:nth-child(2) { font-size: 0.92rem; }
.did-text-size button:nth-child(3) { font-size: 1.04rem; }
.did-text-size button:hover:not(:disabled) { color: #fff; background: rgba(30, 111, 255, 0.18); }
.did-text-size button:disabled { opacity: 0.3; cursor: default; }

/* ---- back-to-top (bottom-right, progress ring) ---- */
.did-back-to-top {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 60;
  display: grid; place-items: center; width: 48px; height: 48px; border-radius: 999px;
  border: 1px solid var(--did-line); background: rgba(2, 10, 25, 0.7); backdrop-filter: blur(10px);
  color: var(--did-blue-glow); cursor: pointer; opacity: 0;
  transform: translateY(14px) scale(0.9); pointer-events: none;
  transition: opacity 0.4s ease, transform 0.4s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.did-back-to-top.show { opacity: 1; transform: none; pointer-events: auto; }
.did-back-to-top:hover { border-color: var(--did-blue); box-shadow: var(--did-glow-sm); color: #fff; }
.did-back-to-top > svg:not(.bttr) { position: relative; z-index: 1; }
.did-back-to-top .bttr { position: absolute; inset: 0; width: 48px; height: 48px; transform: rotate(-90deg); }
.did-back-to-top .bttt { fill: none; stroke: rgba(110, 193, 255, 0.14); stroke-width: 2; }
.did-back-to-top .bttp { fill: none; stroke: var(--did-blue); stroke-width: 2; stroke-linecap: round; transition: stroke-dashoffset 0.15s linear; }
@media (max-width: 640px) {
  .did-text-size { left: 0.6rem; bottom: 0.6rem; }
  .did-back-to-top { right: 0.75rem; bottom: 0.75rem; width: 44px; height: 44px; }
  .did-back-to-top .bttr { width: 44px; height: 44px; }
}