/* ============================================================================
   Binary Inference — Visual language  ·  Light "terminal-paper" theme
   Light, calm surface with a restrained green signal. Framework-independent
   CSS: design tokens, base reset, faint binary-rain background, subtle page
   transition, and quiet components. Subtlety over spectacle.
   ========================================================================== */

:root {
  /* Surfaces (light) */
  --bi-obsidian:   #F6F8F6;   /* page background */
  --bi-obsidian-2: #FFFFFF;
  --bi-surface:    #FFFFFF;
  --bi-surface-2:  #F0F3F0;

  /* Green signal — used sparingly as an accent */
  --bi-green:        #0CA24B;   /* accent fills / icons */
  --bi-green-2:      #0A8A40;   /* deeper */
  --bi-green-strong: #07843E;   /* AA-safe green for small text/links */
  --bi-green-tint:   #E9F6EE;   /* faint green background */

  --bi-success:    #0A8A40;
  --bi-text:       #11181400;   /* placeholder, overwritten below */
  --bi-ink:        #0E1512;     /* near-black headings */
  --bi-body:       #283128;     /* body text */
  --bi-muted:      #55635B;
  --bi-faint:      #8A968E;

  --bi-line:       rgba(13, 40, 25, 0.10);
  --bi-line-2:     rgba(13, 40, 25, 0.055);
  --bi-shadow:     0 1px 2px rgba(16, 32, 22, 0.05), 0 1px 1px rgba(16, 32, 22, 0.04);
  --bi-shadow-lg:  0 18px 40px -22px rgba(12, 60, 32, 0.28);

  --bi-radius: 12px;
  --bi-shell-max: 1160px;
  --bi-sidebar-w: 268px;

  --bi-font-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --bi-font-body:    "Inter", ui-sans-serif, system-ui, sans-serif;
  --bi-font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;
}
:root { --bi-text: var(--bi-body); }

/* ── Base reset ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background-color: var(--bi-obsidian);
  color: var(--bi-body);
  font-family: var(--bi-font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
  font-family: var(--bi-font-display);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.018em;
  color: var(--bi-ink);
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
::selection { background: var(--bi-green); color: #fff; }

:focus-visible {
  outline: 2px solid var(--bi-green);
  outline-offset: 2px;
  border-radius: 3px;
}

.bi-mono { font-family: var(--bi-font-mono); }
[x-cloak] { display: none !important; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--bi-green); color: #fff;
  padding: 0.6rem 1rem; border-radius: 0 0 6px 0; font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ── Layout shell ────────────────────────────────────────────────────────── */
.bi-shell {
  width: 100%;
  max-width: var(--bi-shell-max);
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 4vw, 2rem);
}
.bi-section { padding-block: clamp(3.25rem, 7vw, 6rem); position: relative; }
.bi-section--tight { padding-block: clamp(2.5rem, 5vw, 4rem); }

/* ── Ambient background: very faint binary rain ──────────────────────────── */
.bi-bg {
  position: fixed; inset: 0; z-index: -2;
  background: var(--bi-obsidian);
  overflow: hidden; pointer-events: none;
}
.bi-bg__rain {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0.5;                 /* digits are already pale; keep faint */
  filter: blur(0.4px);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 50%, transparent 88%);
          mask-image: linear-gradient(to bottom, #000 0%, #000 50%, transparent 88%);
}
.bi-bg__scan { display: none; }
.bi-bg__vignette {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 90% 70% at 50% 0%, rgba(12,80,40,0.04), transparent 60%);
}

/* ── Page-transition overlay (subtle, light) ─────────────────────────────── */
.bi-transition {
  position: fixed; inset: 0; z-index: 9999;
  background: var(--bi-obsidian);
  display: grid; place-items: center;
  opacity: 0; visibility: hidden;
  transition: opacity .35s ease, visibility 0s linear .35s;
  pointer-events: none;
}
.bi-transition.is-active {
  opacity: 1; visibility: visible;
  transition: opacity .18s ease;
  pointer-events: all;
}
.bi-transition__rain { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.5; }
.bi-transition__label {
  position: relative;
  display: flex; align-items: center; gap: .7rem;
  font-family: var(--bi-font-mono);
  color: var(--bi-green-strong);
  letter-spacing: 0.32em;
  font-size: .76rem;
  padding-left: 0.32em;
}
.bi-transition__glyph {
  font-size: 1rem; font-weight: 600;
  border: 1px solid var(--bi-line); border-radius: 6px;
  padding: .28rem .48rem; background: var(--bi-green-tint); color: var(--bi-green-strong);
}
.bi-transition__text { animation: bi-flicker 1.4s steps(2) infinite; }
@keyframes bi-flicker { 0%,100% { opacity: 1; } 50% { opacity: .6; } }

/* ── Surfaces & cards ────────────────────────────────────────────────────── */
.bi-glass {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--bi-line);
  border-radius: var(--bi-radius);
  backdrop-filter: blur(8px);
  box-shadow: var(--bi-shadow);
}
.bi-card {
  position: relative;
  background: var(--bi-surface);
  border: 1px solid var(--bi-line);
  border-radius: var(--bi-radius);
  padding: 1.5rem; overflow: hidden;
  box-shadow: var(--bi-shadow);
  transition: transform .25s ease, border-color .25s, box-shadow .25s;
}
.bi-card:hover {
  transform: translateY(-2px);
  border-color: rgba(12, 162, 75, 0.4);
  box-shadow: var(--bi-shadow-lg);
}

.bi-spotlight { position: relative; }
.bi-spotlight::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  background: radial-gradient(380px circle at var(--mx,50%) var(--my,0%), rgba(12,162,75,0.06), transparent 60%);
  opacity: 0; transition: opacity .3s; pointer-events: none;
}
.bi-spotlight:hover::after { opacity: 1; }

/* ── Text effects ────────────────────────────────────────────────────────── */
.bi-gradient-text {
  background: linear-gradient(100deg, var(--bi-ink) 0%, var(--bi-green-2) 78%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.bi-eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--bi-font-mono);
  font-size: .7rem; font-weight: 500; letter-spacing: .2em; text-transform: uppercase;
  color: var(--bi-green-strong);
}
.bi-eyebrow::before {
  content: ""; width: 18px; height: 1px;
  background: var(--bi-green);
}

/* ── Buttons — small, quiet, body font ───────────────────────────────────── */
.bi-btn {
  display: inline-flex; align-items: center; gap: .45rem;
  font-family: var(--bi-font-body);
  font-weight: 500; font-size: .875rem; line-height: 1;
  padding: .55rem 1rem; border-radius: 8px;
  border: 1px solid transparent; cursor: pointer;
  transition: background .18s, border-color .18s, color .18s, box-shadow .18s, transform .12s;
}
.bi-btn:active { transform: translateY(1px); }
.bi-btn--primary {
  background: var(--bi-green); color: #fff;
  box-shadow: 0 1px 2px rgba(10, 110, 55, 0.25);
}
.bi-btn--primary:hover { background: var(--bi-green-2); }
.bi-btn--ghost {
  background: var(--bi-surface); border-color: var(--bi-line); color: var(--bi-ink);
  box-shadow: var(--bi-shadow);
}
.bi-btn--ghost:hover { border-color: rgba(12,162,75,0.45); background: var(--bi-green-tint); color: var(--bi-green-strong); }
.bi-btn i, .bi-btn svg { width: 16px; height: 16px; }

/* ── Terminal / code panel (light) ───────────────────────────────────────── */
.bi-terminal {
  font-family: var(--bi-font-mono); font-size: .8rem; line-height: 1.7;
  background: #FBFCFB;
  border: 1px solid var(--bi-line); border-radius: 10px; overflow: hidden;
  box-shadow: var(--bi-shadow);
}
.bi-terminal__bar {
  display: flex; align-items: center; gap: .45rem;
  padding: .6rem .85rem; border-bottom: 1px solid var(--bi-line);
  background: var(--bi-surface-2); color: var(--bi-muted);
}
.bi-terminal__dot { width: 9px; height: 9px; border-radius: 50%; }
.bi-terminal__body { padding: 1rem 1.05rem; white-space: pre; overflow-x: auto; color: var(--bi-body); }
.bi-c-key { color: var(--bi-green-strong); }
.bi-c-str { color: #b4541a; }
.bi-c-fn  { color: var(--bi-ink); font-weight: 500; }
.bi-c-cm  { color: var(--bi-faint); }

/* ── Misc ────────────────────────────────────────────────────────────────── */
.bi-hairline { height: 1px; background: var(--bi-line); border: 0; }
.bi-chip {
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--bi-font-mono); font-size: .72rem;
  padding: .26rem .6rem; border-radius: 999px;
  border: 1px solid var(--bi-line); background: var(--bi-surface-2); color: var(--bi-muted);
}
.bi-dot-pulse {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--bi-green); box-shadow: 0 0 0 0 rgba(12,162,75,0.5);
  animation: bi-pulse 2.4s infinite;
}
@keyframes bi-pulse {
  0% { box-shadow: 0 0 0 0 rgba(12,162,75,0.45); }
  70% { box-shadow: 0 0 0 7px rgba(12,162,75,0); }
  100% { box-shadow: 0 0 0 0 rgba(12,162,75,0); }
}

/* ── Scroll reveal ───────────────────────────────────────────────────────── */
.bi-reveal { opacity: 0; transform: translateY(16px); transition: opacity .55s ease, transform .55s cubic-bezier(.2,.7,.2,1); }
.bi-reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .bi-reveal { opacity: 1; transform: none; } }

/* ── App shell: sidebar + main column ────────────────────────────────────── */
.bi-app { position: relative; min-height: 100vh; }

.bi-sidebar {
  position: fixed; inset-block: 0; left: 0; width: var(--bi-sidebar-w);
  display: flex; flex-direction: column;
  background: var(--bi-obsidian-2);
  border-right: 1px solid var(--bi-line);
  z-index: 95; overflow-y: auto; overscroll-behavior: contain;
  transform: translateX(-100%);
  transition: transform .3s cubic-bezier(.2,.7,.2,1);
}
.bi-sidebar.is-open { transform: translateX(0); box-shadow: 24px 0 50px -28px rgba(16,32,22,0.35); }
.bi-sidebar::-webkit-scrollbar { width: 8px; }
.bi-sidebar::-webkit-scrollbar-thumb { background: rgba(13,40,25,0.14); border-radius: 8px; }

.bi-sidebar__brand { padding: 1.05rem 1.15rem .95rem; border-bottom: 1px solid var(--bi-line); }
.bi-sidebar__meta { margin: .65rem 0 0; font-family: var(--bi-font-mono); font-size: .66rem; color: var(--bi-faint); letter-spacing: .03em; }

.bi-sidebar__nav { flex: 1; padding: .9rem .7rem; }
.bi-sidebar__group + .bi-sidebar__group { margin-top: 1.35rem; }
.bi-sidebar__label {
  margin: 0 0 .4rem; padding-inline: .6rem;
  font-family: var(--bi-font-mono); font-size: .62rem; font-weight: 600;
  letter-spacing: .2em; text-transform: uppercase; color: var(--bi-faint);
}

.bi-navitem {
  display: flex; align-items: center; gap: .65rem;
  padding: .5rem .6rem; margin-bottom: .1rem;
  border-radius: 8px; border-left: 2px solid transparent;
  color: var(--bi-muted); font-size: .9rem; font-weight: 500;
  transition: color .16s, background .16s, border-color .16s;
}
.bi-navitem__icon { width: 17px; height: 17px; color: var(--bi-faint); transition: color .16s; flex-shrink: 0; }
.bi-navitem:hover { color: var(--bi-ink); background: var(--bi-surface-2); }
.bi-navitem:hover .bi-navitem__icon { color: var(--bi-green-2); }
.bi-navitem.is-active {
  color: var(--bi-ink); background: var(--bi-green-tint);
  border-left-color: var(--bi-green);
}
.bi-navitem.is-active .bi-navitem__icon { color: var(--bi-green); }

.bi-sidebar__foot { padding: .9rem 1rem 1.15rem; border-top: 1px solid var(--bi-line); }
.bi-sidebar__status {
  display: flex; align-items: center; gap: .5rem;
  font-family: var(--bi-font-mono); font-size: .72rem; color: var(--bi-muted);
}

.bi-sidebar-backdrop {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(16, 28, 20, 0.32);
  opacity: 0; visibility: hidden; transition: opacity .3s, visibility 0s linear .3s;
}
.bi-sidebar-backdrop.is-open { opacity: 1; visibility: visible; transition: opacity .3s; }

.bi-main { display: flex; flex-direction: column; min-height: 100vh; }

@media (min-width: 1024px) {
  .bi-sidebar { transform: none; }
  .bi-main { margin-left: var(--bi-sidebar-w); }
  .bi-sidebar-backdrop { display: none; }
}

/* ── Top bar (within main) ───────────────────────────────────────────────── */
.bi-topbar {
  position: sticky; top: 0; z-index: 80;
  display: flex; align-items: center; justify-content: space-between; gap: .75rem;
  height: 58px; padding-inline: clamp(.85rem, 3vw, 1.6rem);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s, backdrop-filter .3s;
}
.bi-topbar.is-stuck { background: rgba(246,248,246,0.82); backdrop-filter: blur(12px); border-bottom-color: var(--bi-line); }

.bi-iconbtn {
  display: inline-grid; place-items: center; flex-shrink: 0;
  width: 38px; height: 38px; border-radius: 8px;
  border: 1px solid var(--bi-line); background: var(--bi-surface);
  color: var(--bi-ink); cursor: pointer; transition: border-color .2s, background .2s;
}
.bi-iconbtn:hover { border-color: rgba(12,162,75,0.4); background: var(--bi-green-tint); }

/* ── Footer ──────────────────────────────────────────────────────────────── */
.bi-footer { margin-top: auto; border-top: 1px solid var(--bi-line); background: var(--bi-obsidian-2); }