/* ==========================================================================
   Base: reset, typography, small layout utilities
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; text-rendering: optimizeLegibility; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}
#app { min-height: 100vh; }
img, svg, video, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
p { margin: 0; }
h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 600; letter-spacing: -0.015em; line-height: 1.2; }
ul, ol { margin: 0; padding: 0; list-style: none; }
hr { border: 0; border-top: 1px solid var(--border); margin: 16px 0; }
code, kbd, pre, samp { font-family: var(--font-mono); font-size: 0.92em; }
table { border-collapse: collapse; width: 100%; }
::selection { background: var(--blueprint-soft); color: var(--text); }
:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-xs); }

/* Scrollbars */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 10px; border: 3px solid transparent; background-clip: content-box; }
*::-webkit-scrollbar-track { background: transparent; }

/* Boot splash */
.boot { min-height: 100vh; display: grid; place-items: center; }
.boot svg { animation: boot-pulse 1.2s var(--ease) infinite; }
@keyframes boot-pulse { 50% { transform: scale(0.9); opacity: 0.7; } }

/* Typography helpers */
.t-display { font-family: var(--font-display); font-weight: 400; letter-spacing: -0.01em; }
.t-mono { font-family: var(--font-mono); }
.t-xs { font-size: var(--fs-xs); }
.t-sm { font-size: var(--fs-sm); }
.t-md { font-size: var(--fs-md); }
.t-lg { font-size: var(--fs-lg); }
.t-xl { font-size: var(--fs-xl); }
.t-2xl { font-size: var(--fs-2xl); }
.t-3xl { font-size: var(--fs-3xl); }
.t-muted { color: var(--text-2); }
.t-faint { color: var(--text-3); }
.t-strong { font-weight: 600; }
.t-medium { font-weight: 500; }
.t-center { text-align: center; }
.t-right { text-align: right; }
.t-nowrap { white-space: nowrap; }
.t-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.t-upper { text-transform: uppercase; letter-spacing: 0.06em; font-size: var(--fs-xs); font-weight: 600; }
.t-tabular { font-variant-numeric: tabular-nums; }
.t-blueprint { color: var(--blueprint); }
.t-green { color: var(--green); }
.t-amber { color: var(--amber); }
.t-red { color: var(--red); }
.t-violet { color: var(--violet); }

/* Layout helpers */
.row { display: flex; align-items: center; gap: 8px; }
.row-top { display: flex; align-items: flex-start; gap: 8px; }
.col { display: flex; flex-direction: column; gap: 8px; }
.wrap { flex-wrap: wrap; }
.grow { flex: 1 1 auto; min-width: 0; }
.shrink-0 { flex-shrink: 0; }
.between { justify-content: space-between; }
.center { justify-content: center; }
.gap-2 { gap: 2px; } .gap-4 { gap: 4px; } .gap-6 { gap: 6px; } .gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; } .gap-20 { gap: 20px; } .gap-24 { gap: 24px; } .gap-32 { gap: 32px; }
.mt-4 { margin-top: 4px; } .mt-8 { margin-top: 8px; } .mt-12 { margin-top: 12px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; } .mt-32 { margin-top: 32px; }
.mb-4 { margin-bottom: 4px; } .mb-8 { margin-bottom: 8px; } .mb-12 { margin-bottom: 12px; } .mb-16 { margin-bottom: 16px; } .mb-24 { margin-bottom: 24px; }
.p-12 { padding: 12px; } .p-16 { padding: 16px; } .p-20 { padding: 20px; } .p-24 { padding: 24px; }
.w-full { width: 100%; }
.hidden { display: none !important; }
.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; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); } }

/* Blueprint paper background (used for canvases & hero) */
.paper-grid {
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* Motion */
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes rise-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@keyframes pop-in { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: none; } }
@keyframes slide-in-right { from { transform: translateX(24px); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes shimmer { 0% { background-position: -400px 0; } 100% { background-position: 400px 0; } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
.anim-rise { animation: rise-in var(--dur-slow) var(--ease) both; }
.anim-fade { animation: fade-in var(--dur-slow) var(--ease) both; }
.anim-pop { animation: pop-in var(--dur) var(--ease) both; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 1ms !important; animation-iteration-count: 1 !important; transition-duration: 1ms !important; }
}