/* SolUPG — technical/terminal aesthetic */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  --bg: #0a0b0f;
  --bg-2: #0d0f14;
  --surface: #0f1115;
  --surface-2: #14171e;
  --line: #1a1d24;
  --line-2: #242933;
  --fg: #e6e8ec;
  --fg-2: #c2c6cf;
  --dim: #7a818e;
  --dim-2: #565c68;
  --accent: #9945ff;
  --accent-soft: rgba(153, 69, 255, 0.12);
  --accent-line: rgba(153, 69, 255, 0.35);
  --ok: #14f195;
  --ok-soft: rgba(20, 241, 149, 0.12);
  --warn: #f2b544;
  --warn-soft: rgba(242, 181, 68, 0.12);
  --err: #f26262;

  --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --max-w: 1280px;
  --pad-x: 24px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body {
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(153,69,255,0.06), transparent 60%),
    radial-gradient(800px 500px at -10% 10%, rgba(20,241,149,0.04), transparent 60%);
  background-attachment: fixed;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* Utility */
.mono { font-family: var(--font-mono); }
.dim { color: var(--dim); }
.fg-2 { color: var(--fg-2); }
.ok { color: var(--ok); }
.accent { color: var(--accent); }
.warn { color: var(--warn); }

.u-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim);
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

/* Top chrome */
.statusbar {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--dim);
  letter-spacing: 0.02em;
}
.statusbar-inner {
  display: flex; gap: 24px; align-items: center;
  height: 28px;
  padding: 0 var(--pad-x);
  max-width: var(--max-w); margin: 0 auto;
}
.statusbar .sep { color: var(--line-2); }
.statusbar .live-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--ok); display: inline-block; margin-right: 6px;
  box-shadow: 0 0 0 3px rgba(20,241,149,0.15);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(10,11,15, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
  max-width: var(--max-w); margin: 0 auto; padding: 0 var(--pad-x);
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-weight: 600; font-size: 14px;
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 22px; height: 22px; display: inline-flex; align-items: center; justify-content: center;
  position: relative;
}
.brand-mark::before, .brand-mark::after {
  content: ''; position: absolute; inset: 0; border-radius: 3px;
}
.brand-mark::before {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent) 45%, transparent 45%, transparent 55%, var(--ok) 55%);
  opacity: 0.95;
}
.brand-mark::after {
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 3px;
}
.brand .tag { color: var(--dim); font-weight: 400; margin-left: 6px; }

.nav-links { display: flex; gap: 4px; align-items: center; }
.nav-link {
  font-family: var(--font-mono); font-size: 12px; color: var(--dim);
  padding: 6px 10px; border-radius: 4px;
  transition: color .15s ease, background .15s ease;
}
.nav-link:hover { color: var(--fg); background: var(--surface); }
.nav-link.active { color: var(--fg); background: var(--surface); }

.nav-right { display: flex; gap: 8px; align-items: center; }

/* Hamburger menu */
.nav-hamburger {
  display: none;
  background: none;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  color: var(--fg);
  cursor: pointer;
  padding: 6px;
  transition: all .15s;
}
.nav-hamburger:hover { border-color: var(--dim-2); background: var(--surface); }
@media (max-width: 900px) {
  .nav-hamburger { display: flex; align-items: center; }
  .nav-links.open {
    display: flex !important;
    flex-direction: column;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: rgba(10,11,15,0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    padding: 16px var(--pad-x);
    gap: 4px;
    z-index: 50;
  }
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 34px; padding: 0 14px;
  border-radius: 4px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.01em;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--fg);
  cursor: pointer;
  transition: all .15s ease;
  white-space: nowrap;
}
.btn:hover { border-color: var(--dim-2); background: var(--surface-2); }
.btn-primary {
  background: var(--fg); color: var(--bg); border-color: var(--fg);
}
.btn-primary:hover { background: #fff; border-color: #fff; }
.btn-accent {
  background: var(--accent); color: #fff; border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(153,69,255,0.0), 0 8px 24px -8px rgba(153,69,255,0.5);
}
.btn-accent:hover { background: #a858ff; border-color: #a858ff; }
.btn-ghost { background: transparent; }
.btn .k { color: var(--dim); margin-left: 4px; font-size: 11px; }
.btn-lg { height: 40px; padding: 0 18px; font-size: 13px; }

/* Chips / pills */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 11px;
  padding: 3px 8px; border-radius: 3px;
  border: 1px solid var(--line-2); color: var(--fg-2);
  background: var(--surface);
  letter-spacing: 0.02em;
}
.pill.ok { color: var(--ok); border-color: rgba(20,241,149,0.25); background: var(--ok-soft); }
.pill.accent { color: var(--accent); border-color: var(--accent-line); background: var(--accent-soft); }
.pill.warn { color: var(--warn); border-color: rgba(242,181,68,0.3); background: var(--warn-soft); }
.pill.dot::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; display: inline-block;
}

/* Section framework */
.section {
  position: relative;
  border-top: 1px solid var(--line);
}
.section-head {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  padding: 48px var(--pad-x) 24px;
  max-width: var(--max-w); margin: 0 auto;
  border-bottom: 1px dashed var(--line);
}
.section-head .idx {
  font-family: var(--font-mono); font-size: 11px; color: var(--dim);
  letter-spacing: 0.1em; text-transform: uppercase;
}
.section-head .title {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 600; letter-spacing: -0.015em;
  margin: 0 0 8px;
}
.section-head .sub {
  color: var(--dim); max-width: 60ch;
  font-size: 15px;
}
.section-body {
  max-width: var(--max-w); margin: 0 auto;
  padding: 32px var(--pad-x) 72px;
}

/* Code / terminal blocks */
.code {
  font-family: var(--font-mono); font-size: 13px; line-height: 1.7;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  font-size: 11px; color: var(--dim);
  letter-spacing: 0.04em; text-transform: uppercase;
}
.code-body {
  display: grid;
  grid-template-columns: 48px 1fr;
  padding: 12px 0;
}
.code-body .gutter {
  color: var(--dim-2); text-align: right; padding-right: 12px;
  user-select: none;
  border-right: 1px solid var(--line);
}
.code-body .src {
  padding: 0 16px;
  white-space: pre;
  overflow-x: auto;
}

/* Token colors */
.tkw { color: #c792ea; } /* keyword */
.tfn { color: #82aaff; } /* function */
.tst { color: #c3e88d; } /* string */
.tco { color: var(--dim-2); font-style: italic; } /* comment */
.tnm { color: #ffcb6b; } /* number */
.tpr { color: var(--ok); }
.tac { color: var(--accent); }
.tvr { color: #e6e8ec; }

/* Data row */
.row {
  display: grid; align-items: center;
  grid-template-columns: 36px 1fr auto;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 13px;
}
.row .n { color: var(--dim-2); font-size: 11px; }
.row .label { color: var(--fg); }
.row .val { color: var(--dim); }

/* Footer */
.footer {
  border-top: 1px solid var(--line);
  padding: 48px var(--pad-x);
  font-family: var(--font-mono); font-size: 12px; color: var(--dim);
}
.footer .inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px;
}
.footer h5 {
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--dim); margin: 0 0 14px; font-weight: 500;
}
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.footer a:hover { color: var(--fg); }
.footer .legal {
  max-width: var(--max-w); margin: 32px auto 0; padding-top: 24px;
  border-top: 1px dashed var(--line);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 11px;
}

/* Scrollbar (webkit) */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--dim-2); }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(8px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 900px) {
  .section-head { grid-template-columns: 1fr; gap: 8px; }
  .footer .inner { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
}

/* Tweaks panel */
.tweaks {
  position: fixed; right: 20px; bottom: 20px; z-index: 80;
  width: 280px;
  background: var(--surface);
  border: 1px solid var(--line-2);
  border-radius: 8px;
  padding: 14px;
  font-family: var(--font-mono); font-size: 12px;
  box-shadow: 0 20px 60px -20px rgba(0,0,0,0.6);
  display: none;
}
.tweaks.open { display: block; }
.tweaks h4 {
  margin: 0 0 12px; font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--dim); font-weight: 500;
  display: flex; justify-content: space-between; align-items: center;
}
.tweaks label { display: block; margin-bottom: 10px; color: var(--fg-2); font-size: 11px; }
.tweaks .swatches { display: flex; gap: 6px; margin-top: 6px; }
.tweaks .sw {
  width: 22px; height: 22px; border-radius: 4px; cursor: pointer;
  border: 1px solid var(--line-2);
}
.tweaks .sw.active { outline: 2px solid var(--fg); outline-offset: 1px; }
.tweaks select, .tweaks input[type="range"] {
  width: 100%; background: var(--bg); color: var(--fg);
  border: 1px solid var(--line-2); border-radius: 4px;
  padding: 4px 6px; font-family: var(--font-mono); font-size: 11px;
}