/* SG Systems — shared design tokens and primitives for the platforms.
 *
 * Deliberately standalone: the landing keeps its own css/style.css, so the
 * platforms can evolve without touching (or breaking) the marketing site.
 */

:root {
  --bg: #050505;
  --fg: #ffffff;
  --dim: rgba(255, 255, 255, 0.62);
  --faint: rgba(255, 255, 255, 0.28);
  --line: rgba(255, 255, 255, 0.16);
  --ok: #ffffff;
  --display: "Archivo Black", "Archivo", "Helvetica Neue", Arial, sans-serif;
  --body: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --pad: clamp(1.25rem, 4vw, 4rem);
  --maxw: 46rem;
}

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

html { scroll-behavior: auto; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--body);
  font-size: clamp(1rem, 1.05vw, 1.125rem);
  line-height: 1.55;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--fg); color: var(--bg); }

/* ambient particle field (app/shared/field.js) */
#sg-field {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* ---------------------------------------------------------------- chrome */

.sg-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem var(--pad);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.sg-bar a { color: var(--fg); text-decoration: none; }
.sg-bar a { text-shadow: 0 0 8px var(--bg), 0 0 18px var(--bg); }
.sg-logo { font-family: var(--display); letter-spacing: 0.08em; }
.sg-bar .sg-back { opacity: 0.65; transition: opacity 0.2s; }
.sg-bar .sg-back:hover { opacity: 1; }

.sg-main { position: relative; z-index: 1; padding: 5rem 0 4rem; }
.sg-wrap { width: 100%; max-width: 62rem; margin: 0 auto; padding-inline: var(--pad); }

/* ------------------------------------------------------------ typography */

.sg-display {
  font-family: var(--display);
  font-weight: 900;
  text-transform: uppercase;
  line-height: 0.92;
  letter-spacing: -0.01em;
}

h1.sg-display { font-size: clamp(2.4rem, 7vw, 4.6rem); }
h2.sg-display { font-size: clamp(1.6rem, 4vw, 2.6rem); }

.sg-outline {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--fg);
  text-stroke: 1.5px var(--fg);
}

.sg-index {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  color: var(--dim);
}

.sg-lead { color: var(--dim); max-width: var(--maxw); margin: 1em 0; }
.sg-note { color: var(--faint); font-size: 0.9em; max-width: var(--maxw); }

/* keeps type legible over the drifting field */
.sg-main h1, .sg-main h2, .sg-main h3, .sg-main p, .sg-main li, .sg-main span {
  text-shadow: 0 0 6px var(--bg), 0 0 14px var(--bg);
}

/* ------------------------------------------------------------- controls */

.sg-btn {
  display: inline-block;
  border: 1px solid var(--fg);
  background: var(--fg);
  color: var(--bg);
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
  padding: 1em 2em;
  border-radius: 999px;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, opacity 0.2s;
  text-shadow: none !important;
}

.sg-btn:hover { background: transparent; color: var(--fg); }
.sg-btn:disabled { opacity: 0.35; cursor: default; }
.sg-btn:disabled:hover { background: var(--fg); color: var(--bg); }

.sg-btn.ghost { background: transparent; color: var(--fg); border-color: var(--faint); }
.sg-btn.ghost:hover { border-color: var(--fg); background: transparent; color: var(--fg); }

.sg-link {
  display: inline-block;
  color: var(--fg);
  text-decoration: none;
  font-family: var(--display);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  border-bottom: 1px solid var(--faint);
  padding-bottom: 0.35em;
  transition: border-color 0.2s, letter-spacing 0.2s;
}

.sg-link:hover { border-color: var(--fg); letter-spacing: 0.26em; }

/* ---------------------------------------------------------------- cards */

.sg-card {
  border-top: 1px solid var(--line);
  padding-top: 1em;
}

.sg-card h3 {
  font-family: var(--display);
  text-transform: uppercase;
  font-size: clamp(1rem, 1.6vw, 1.3rem);
  line-height: 1.05;
  margin-bottom: 0.6em;
}

.sg-card p { color: var(--dim); font-size: 0.94em; }

.sg-card-meta {
  display: flex;
  align-items: baseline;
  gap: 0.9em;
  font-family: var(--display);
  text-transform: uppercase;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--faint) !important;
  margin-bottom: 0.7em;
}

/* a challenge nobody has reviewed yet says so, on the page and in the list */
.sg-draft {
  border: 1px solid var(--line);
  border-radius: 2em;
  padding: 0.25em 0.7em;
  font-size: 0.9em;
  letter-spacing: 0.12em;
}

.sg-card-foot {
  margin-top: 0.7em;
  font-size: 0.8rem !important;
  color: var(--faint) !important;
}

.sg-grid { display: grid; gap: clamp(1.2rem, 3vw, 2.5rem); }
.sg-grid.two { grid-template-columns: repeat(2, 1fr); }
.sg-grid.three { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 720px) {
  .sg-grid.two, .sg-grid.three { grid-template-columns: 1fr; }
}

/* ---------------------------------------------------------------- footer */

.sg-foot {
  margin-top: clamp(2.5rem, 8vh, 5rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  justify-content: space-between;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
}

.sg-foot a { color: var(--dim); text-decoration: none; }
.sg-foot a:hover { color: var(--fg); }

@media (prefers-reduced-motion: reduce) {
  #sg-field { display: none; }
}

/* ------------------------------------------------- readability scrims ----
 * Same device as the landing: a feathered blur panel sits behind each text
 * block, so the drifting field softens under the words and stays sharp
 * everywhere else. Applied by selector, so engine markup stays clean.
 */

.sg-main h1, .sg-main h2, .sg-lead, .sg-note, .sg-card, .sg-index, .sg-foot {
  position: relative;
}

.sg-main h1::before, .sg-main h2::before, .sg-lead::before, .sg-note::before,
.sg-card::before, .sg-index::before, .sg-foot::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -0.9rem -1.4rem;
  pointer-events: none;
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  -webkit-mask-image: radial-gradient(ellipse 100% 100% at 50% 50%, #000 55%, transparent 99%);
  mask-image: radial-gradient(ellipse 100% 100% at 50% 50%, #000 55%, transparent 99%);
}