/* =========================================================
   Shared design system — usd-freelance portfolio + demos
   Aesthetic: engineer's terminal x editorial. Dark, precise,
   warm amber accent, IBM Plex Mono display + Fraunces serif.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,900&family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

:root {
  --bg:        #0d0f14;
  --bg-raise:  #14171f;
  --bg-panel:  #191d27;
  --line:      #262b38;
  --line-soft: #1e222d;
  --ink:       #e8e6df;
  --ink-dim:   #a3a49c;
  --ink-faint: #6a6c70;
  --amber:     #f0a842;
  --amber-dim: #b57e2f;
  --cyan:      #58c8c0;
  --rose:      #e0716b;
  --green:     #7bbd7b;
  --violet:    #9c8cf0;

  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
  --serif: 'Fraunces', Georgia, serif;

  --r: 10px;
  --maxw: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  /* subtle grain + radial glow */
  background-image:
    radial-gradient(1100px 600px at 78% -10%, rgba(240,168,66,0.09), transparent 60%),
    radial-gradient(900px 500px at 0% 100%, rgba(88,200,192,0.05), transparent 55%);
  background-attachment: fixed;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: var(--amber); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ---- eyebrow / kicker ---- */
.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber);
}
.kicker::before { content: "// "; color: var(--amber-dim); }

/* ---- headings ---- */
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.08; letter-spacing: -0.01em; }

/* ---- top nav ---- */
.topbar {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(13,15,20,0.72);
  border-bottom: 1px solid var(--line-soft);
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { font-family: var(--mono); font-weight: 600; font-size: 15px; color: var(--ink); letter-spacing: -0.01em; }
.brand .dot { color: var(--amber); }
.topnav { display: flex; gap: 26px; font-family: var(--mono); font-size: 13px; }
.topnav a { color: var(--ink-dim); }
.topnav a:hover { color: var(--ink); text-decoration: none; }

/* ---- buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-size: 13.5px; font-weight: 500;
  padding: 12px 20px; border-radius: 8px;
  border: 1px solid var(--amber); color: var(--bg); background: var(--amber);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); box-shadow: 0 10px 30px rgba(240,168,66,0.28); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--amber); box-shadow: none; color: var(--amber); }

/* ---- panels / cards ---- */
.panel {
  background: linear-gradient(180deg, var(--bg-panel), var(--bg-raise));
  border: 1px solid var(--line);
  border-radius: var(--r);
}

/* ---- pills / tags ---- */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .04em;
  padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--ink-dim); background: var(--bg-raise);
}

/* ---- note / disclosure banner ---- */
.note {
  font-family: var(--mono); font-size: 12.5px; line-height: 1.7;
  color: var(--ink-dim);
  border-left: 2px solid var(--amber-dim);
  padding: 10px 0 10px 16px;
  background: linear-gradient(90deg, rgba(240,168,66,0.05), transparent);
}
.note b { color: var(--amber); font-weight: 600; }

/* ---- demo page chrome ---- */
.demo-hero { padding: 46px 0 26px; border-bottom: 1px solid var(--line-soft); }
.demo-title { font-size: clamp(30px, 5vw, 46px); margin: 12px 0 10px; }
.lead { font-size: 18px; color: var(--ink-dim); max-width: 62ch; line-height: 1.55; }
.back { font-family: var(--mono); font-size: 12.5px; color: var(--ink-faint); }
.back:hover { color: var(--amber); text-decoration: none; }

section.block { padding: 40px 0; }
.section-label { font-family: var(--mono); font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 18px; }

/* ---- footer ---- */
.site-foot { border-top: 1px solid var(--line-soft); padding: 40px 0; margin-top: 30px; color: var(--ink-faint); font-family: var(--mono); font-size: 13px; }
.site-foot a { color: var(--ink-dim); }

/* ---- utility ---- */
.mono { font-family: var(--mono); }
.dim { color: var(--ink-dim); }
.faint { color: var(--ink-faint); }
.center { text-align: center; }

@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.rise { animation: rise .7s cubic-bezier(.2,.7,.2,1) both; }

/* accessible focus */
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 4px; }

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
}