/* ── shared.css — sandboxsc design system ─────────────────────────────────── */

/* ── Variables ───────────────────────────────────────────────────────────── */
:root {
  --bg:        #080808;
  --bg2:       #0e0e0e;
  --ink:       #f0efeb;
  --dim:       rgba(240,239,235,.50);
  --dimmer:    rgba(240,239,235,.48);
  --border:    rgba(240,239,235,.08);
  --border-hi: rgba(240,239,235,.22);
  --accent:    rgba(215,185,100,1);
  --mono:      'JetBrains Mono', monospace;
  --sans:      'Inter', system-ui, sans-serif;
}

/* ── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg); scrollbar-gutter: stable; overflow-x: hidden; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ── Skip link ───────────────────────────────────────────────────────────── */
.skip-link {
  position: absolute; top: -100%; left: 16px;
  background: var(--ink); color: var(--bg);
  padding: 10px 18px;
  font-family: var(--mono); font-size: 12px; font-weight: 700;
  letter-spacing: .06em; text-decoration: none; z-index: 10000;
}
.skip-link:focus { top: 16px; }

/* ── Screen reader only ──────────────────────────────────────────────────── */
.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 ring ──────────────────────────────────────────────────────────── */
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

/* ── Selection ───────────────────────────────────────────────────────────── */
::selection { background: rgba(240,239,235,.15); color: var(--ink); }

/* ── Grain overlay ───────────────────────────────────────────────────────── */
body::before {
  content: '';
  position: fixed; top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 9999; pointer-events: none;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23g)' opacity='1'/%3E%3C/svg%3E");
  background-size: 300px 300px;
  opacity: 0.048;
  mix-blend-mode: overlay;
}

/* ── Scroll reveal ───────────────────────────────────────────────────────── */
.fade-up {
  opacity: 0; transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.16,1,0.3,1), transform 0.7s cubic-bezier(0.16,1,0.3,1);
}
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up.d1 { transition-delay: 0.10s; }
.fade-up.d2 { transition-delay: 0.20s; }
.fade-up.d3 { transition-delay: 0.30s; }
.fade-up.d4 { transition-delay: 0.40s; }

.fade {
  opacity: 0; transform: translateY(24px);
  transition: opacity 1s cubic-bezier(.16,1,.3,1), transform 1s cubic-bezier(.16,1,.3,1);
}
.fade.in { opacity: 1; transform: none; }
.d1{transition-delay:.09s} .d2{transition-delay:.17s} .d3{transition-delay:.25s}
.d4{transition-delay:.33s} .d5{transition-delay:.41s} .d6{transition-delay:.49s}

.slide-divider.fade-up {
  clip-path: inset(0 100% 0 0); transform: none; opacity: 1;
  transition: clip-path 0.9s cubic-bezier(0.16,1,0.3,1) 0.25s;
}
.slide-divider.fade-up.visible { clip-path: inset(0 0% 0 0); }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center;
  padding: 14px 20px; min-height: 44px;
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  font-style: normal; letter-spacing: 0.08em;
  border: 1px solid var(--border-hi);
  background: transparent; color: var(--ink);
  cursor: pointer; text-decoration: none;
  transition: background 0.2s, border-color 0.2s;
}
.btn:hover { background: rgba(255,255,255,0.06); }
.btn-fill {
  background: var(--ink); color: var(--bg);
  border-color: var(--ink); font-weight: 700;
}
.btn-fill:hover { background: rgba(255,255,255,0.88); }
.btn-outline {
  border: 1px solid var(--border);
  color: var(--dimmer);
}
.btn-outline:hover { color: var(--ink); border-color: var(--border-hi); }

/* ── Page header (contact, faq, speaker) ─────────────────────────────────── */
.page-header {
  padding: 148px 80px 72px;
  max-width: 1440px;
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}
.page-back {
  display: inline-block;
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em;
  color: var(--dimmer); margin-bottom: 40px; transition: color .2s;
}
.page-back:hover { color: var(--ink); }
.page-back:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.page-title {
  font-size: clamp(36px, 5vw, 72px);
  font-weight: 300; letter-spacing: -.04em;
  line-height: 1; color: var(--ink); margin-bottom: 20px;
}
.page-title em { font-style: italic; }
.page-sub {
  font-size: 15px; font-weight: 300;
  color: var(--dimmer); letter-spacing: .02em;
}

/* ── Footer background word ──────────────────────────────────────────────── */
.footer-bg-word {
  position: absolute; bottom: -0.18em; left: 50%; transform: translateX(-50%);
  font-size: clamp(160px,28vw,400px); font-weight: 700; letter-spacing: -.06em;
  color: rgba(240,239,235,.028); white-space: nowrap; pointer-events: none;
  user-select: none; line-height: 1; font-family: var(--sans);
}

/* ── Responsive: page header ─────────────────────────────────────────────── */
@media(max-width:900px) {
  .page-header { padding: 130px 28px 52px; }
}
@media(max-width:680px) {
  .page-header { padding: 118px 24px 48px; }
  .page-title { font-size: clamp(28px, 8vw, 52px); }
}
@media(max-width:480px) {
  .page-header { padding: 108px 20px 44px; }
  .page-title { font-size: clamp(26px, 8vw, 44px); }
  .footer-bg-word { display: none; }
}
@media(max-width:390px) {
  .page-header { padding: 100px 16px 40px; }
}

/* ── Prefers-reduced-motion ──────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .fade-up, .fade, .slide-divider.fade-up { transition: none; }
}