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

body {
  background: var(--color-page);
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* Circuit-grid watermark, fixed under everything, fading out toward the
   bottom of the viewport so it never fights body copy on long pages. */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 80% 55% at 50% 0%, #000 0%, transparent 78%);
          mask-image: radial-gradient(ellipse 80% 55% at 50% 0%, #000 0%, transparent 78%);
}
/* CRT scanline overlay, fixed, above content, never intercepts clicks. */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 500; pointer-events: none;
  background: repeating-linear-gradient(to bottom,
    rgba(255, 255, 255, 0.03) 0px, rgba(255, 255, 255, 0.03) 1px,
    transparent 1px, transparent 3px);
  mix-blend-mode: overlay; opacity: 0.7;
}
/* Everything else needs to sit above the fixed watermark layer. */
.site-header, main, footer { position: relative; z-index: 1; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-3);
  color: var(--color-ink);
  text-wrap: balance;
}
h1 { font-size: clamp(28px, 4vw, 40px); }
h2 { font-size: clamp(22px, 3vw, 28px); }
h3 { font-size: 18px; }

p { margin: 0 0 var(--space-4); color: var(--color-ink-secondary); }
a { color: var(--color-accent); }

.tabular-nums { font-variant-numeric: tabular-nums; }

/* Mono label — session codes, stat captions, small uppercase tags. */
.eyebrow, .mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* Site header — sticky, translucent, blurred. Nightshift drops the old
   saturated brand band in favor of a header that just floats over the
   page, matching the landing nav. */
.site-header {
  position: sticky; top: 0; z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--hero-line);
  background: color-mix(in srgb, var(--hero-bg) 82%, transparent);
  backdrop-filter: blur(10px);
}
.site-header .brand {
  font-family: var(--font-heading);
  font-weight: 800;
  color: var(--hero-ink);
  text-decoration: none;
  font-size: 16px;
  letter-spacing: .02em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 9px;
}
/* Small diamond "signal" mark — the one bit of always-on glow in the
   header, keeps the sticky bar from reading as fully inert. */
.site-header .brand::before {
  content: "";
  width: 8px; height: 8px;
  background: var(--color-primary);
  transform: rotate(45deg);
  filter: var(--glow-primary-sm);
  flex-shrink: 0;
}
.site-header nav { display: flex; gap: var(--space-4); align-items: center; }
.site-header nav a:not(.btn) { position: relative; color: var(--hero-ink-dim); text-decoration: none; font-size: 14px; font-weight: 600; transition: color var(--duration-fast) var(--ease-standard); }
.site-header nav a:not(.btn):hover { color: var(--hero-ink); }
.site-header nav a:not(.btn)::after {
  content: "";
  position: absolute; left: 0; right: 100%; bottom: -4px; height: 2px;
  background: var(--hero-eyebrow);
  transition: right var(--duration-base) var(--ease-standard);
}
.site-header nav a:not(.btn):hover::after { right: 0; }
.site-header .btn-secondary { border-color: color-mix(in srgb, var(--hero-ink) 32%, transparent); color: var(--hero-ink); }
.site-header .btn-secondary:hover { border-color: color-mix(in srgb, var(--hero-ink) 80%, transparent); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .08em;
  clip-path: var(--chamfer-sm);
  border: 1px solid transparent;
  padding: 11px 22px;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--duration-fast) var(--ease-standard),
    opacity var(--duration-fast) var(--ease-standard),
    filter var(--duration-fast) var(--ease-standard),
    background var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) var(--ease-standard);
}
.btn:active { transform: translateY(1px); }
/* Primary action is a filled, glowing button — drop-shadow (not
   box-shadow) so the glow survives the chamfered clip-path. */
.btn-primary { background: var(--color-cta); color: var(--color-cta-ink); border-color: transparent; font-weight: 700; filter: var(--glow-primary-lg); }
.btn-primary:hover { background: var(--color-cta-hover); filter: var(--glow-primary-lg) brightness(1.06); }
.btn-primary:active { background: var(--color-primary-deep); filter: none; }
.btn-secondary { background: transparent; box-shadow: inset 0 0 0 1px var(--color-border); color: var(--color-ink); }
.btn-secondary:hover { box-shadow: inset 0 0 0 1px var(--color-primary); color: var(--color-primary); filter: var(--glow-primary-sm); }
.btn-secondary:active { box-shadow: inset 0 0 0 1px var(--color-primary-deep); filter: none; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; filter: none; }
.btn-block { width: 100%; }

/* Freestanding rules fade to transparent at their ends. */
.hr {
  border: 0; height: 1px; margin: var(--space-4) 0;
  background: linear-gradient(to right,
    transparent, var(--color-border) 48px,
    var(--color-border) calc(100% - 48px), transparent);
}

/* Keyboard focus is always the accent ring — never the browser default. */
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; filter: var(--glow-primary-sm); }
::selection { background: color-mix(in srgb, var(--color-primary) 30%, transparent); }

/* Photographs blend into the dark ground — dark values fall away. */
.lighten { mix-blend-mode: lighten; background-color: transparent; }

.field { margin-bottom: var(--space-4); }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: var(--space-2); color: var(--color-ink); }
.field input[type="text"],
.field input[type="email"],
.field input[type="password"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  clip-path: var(--chamfer-sm);
  background: var(--color-surface-raised);
  color: var(--color-ink);
  font-size: 15px;
  font-family: var(--font-body);
  transition: border-color var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}
.field input:focus { outline: none; border-color: var(--color-primary); box-shadow: inset 0 0 0 1px var(--color-primary), 0 0 0 3px var(--color-primary-soft); }
.field .hint { font-size: 12px; color: var(--color-ink-muted); margin-top: var(--space-1); }
.field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  clip-path: var(--chamfer-sm);
  background: var(--color-surface-raised);
  color: var(--color-ink);
  font-size: 15px;
  font-family: var(--font-body);
  transition: border-color var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}
.field select:focus { outline: none; border-color: var(--color-primary); box-shadow: inset 0 0 0 1px var(--color-primary), 0 0 0 3px var(--color-primary-soft); }

.form-card {
  max-width: 420px;
  margin: var(--space-7) auto;
  background: var(--color-surface);
  clip-path: var(--chamfer);
  box-shadow: var(--shadow-elevated);
  padding: var(--space-6);
}

.alert { padding: var(--space-3) var(--space-4); border-radius: var(--radius-control); font-size: 14px; margin-bottom: var(--space-4); }
.alert-error { background: rgba(179,35,31,0.10); color: var(--color-critical); }
.alert-success { background: rgba(12,163,12,0.10); color: var(--color-complete); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}

.skip-link {
  position: absolute; left: -999px; top: 0;
}
.skip-link:focus { left: var(--space-3); top: var(--space-3); background: var(--color-surface); padding: var(--space-2); z-index: 100; }

@media (max-width: 640px) {
  .site-header nav { gap: var(--space-3); }
  .container { padding: 0 var(--space-4); }
}