/* ================================================================
   SLD — shared design system
   Used by index.html (landing) and app.html (studio).
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wdth,wght@62..125,400..900&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --paper:      #F3F3F0;
  --card:       #FCFCFB;
  --ink:        #15171C;
  --ink-2:      #2A2D35;
  --line:       #DDDFDA;
  --line-dark:  #33363E;
  /* Brand — matched to the SLD logo: deep navy letters, azure swoosh */
  --navy:       #16265C;
  --blue:       #1B2F7E;
  --blue-deep:  #14235F;
  --azure:      #1E90FF;   /* graphics/gradients only — not enough contrast for text */
  --grad:       linear-gradient(115deg, #16265C 10%, #1B2F7E 45%, #1E90FF 120%);
  --blue-soft:  #E7EDFB;
  --red:        #E03A2F;
  --red-soft:   #FCEAE8;
  --green:      #1E9E63;
  --green-soft: #E3F4EC;
  --amber:      #C97E12;
  /* AA text-safe variants (≥4.5:1 on paper/card) for small colored text */
  --red-text:   #C02418;
  --green-text: #157A4B;
  --amber-text: #8A5606;
  --muted:      #5E636D;
  --muted-dark: #9DA2AB;
  --radius:     14px;
  --shadow-sm:  0 1px 2px rgba(21, 23, 28, 0.05);
  --shadow-md:  0 8px 28px rgba(21, 23, 28, 0.09);
  --shadow-lift: 0 16px 44px rgba(21, 23, 28, 0.13);
}

/* ---------- Accessibility foundations ---------- */

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

:focus-visible {
  outline: 2px solid var(--azure);
  outline-offset: 2px;
  border-radius: 4px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Archivo', sans-serif;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: 'IBM Plex Mono', monospace; }

::selection { background: var(--blue); color: #fff; }

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.container.narrow { max-width: 860px; }

/* ---------- Type ---------- */

.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 14px;
}

h1.display {
  font-weight: 850;
  font-stretch: 108%;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.0;
  letter-spacing: -2.4px;
}

h2.section-title {
  font-weight: 800;
  font-stretch: 106%;
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1.06;
  letter-spacing: -1.2px;
}

.lede {
  font-size: 17px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 56ch;
}

/* ---------- Nav ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 243, 240, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(221, 223, 218, 0.7);
}

.site-nav .inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.wordmark .logo-svg { height: 34px; width: auto; display: block; }

/* legacy text fallback (kept for any page still using the span) */
.wordmark .sld {
  font-weight: 900;
  font-stretch: 115%;
  font-size: 26px;
  letter-spacing: -1px;
}

.wordmark .sld em { font-style: normal; color: var(--blue); }

.wordmark .full {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9.5px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--muted);
}

.nav-links { display: flex; align-items: center; gap: 4px; }

.nav-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 99px;
  transition: color 0.15s, background 0.15s;
}

.nav-links a:hover { color: var(--ink); background: rgba(21, 23, 28, 0.05); }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: 'Archivo', sans-serif;
  font-size: 15px;
  font-weight: 700;
  padding: 13px 26px;
  border-radius: 99px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.2s, background 0.15s, color 0.15s, border-color 0.15s;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 6px 18px rgba(22, 38, 92, 0.30);
}

.btn-primary:hover { filter: brightness(1.12); transform: translateY(-1px); }

.btn-dark { background: var(--ink); color: var(--paper); }
.btn-dark:hover { background: var(--blue); color: #fff; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn-ghost:hover { border-color: var(--ink); }

.btn-sm { font-size: 13.5px; padding: 9px 18px; }

/* ---------- Cards ---------- */

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

/* ---------- Reveal on scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(.16,1,.3,1), transform 0.7s cubic-bezier(.16,1,.3,1);
}

.reveal.in { opacity: 1; transform: none; }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--ink);
  color: var(--muted-dark);
  margin-top: 110px;
}

.site-footer .inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 60px 24px 36px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--line-dark);
}

.footer-grid .wordmark { color: #fff; }
.footer-grid .wordmark .full { color: var(--muted-dark); }

.footer-tag { margin-top: 14px; font-size: 13.5px; line-height: 1.65; max-width: 34ch; }

.footer-col h4 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-col a {
  display: block;
  color: var(--muted-dark);
  text-decoration: none;
  font-size: 14px;
  padding: 5px 0;
  transition: color 0.15s;
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 26px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 1px;
}

/* ---------- Focus / motion ---------- */

button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links a:not(.btn) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}