/* =========================================================================
   fpga-lsp project site — shared layout & components
   Built on top of Palimpsest NYC's colors_and_type.css.
   Tone: technical / restrained. Cobalt structure, magenta highlights only
   where they earn it. No ornament for ornament's sake.
   ========================================================================= */

:root {
  --site-max: 1180px;
  --gutter: clamp(20px, 4vw, 56px);
  --nav-h: 64px;
}

/* Dark mode override — same hues, inverted surfaces */
[data-theme="dark"] {
  --ice:        #0F1226;
  --ice-2:      #181B36;
  --ice-3:      #232646;
  --ice-rule:   #2C3158;
  --paper:      #14172E;
  --white:      #1A1D38;

  --ink:        #E8EAF6;
  --ink-2:      #C5CADC;
  --ink-3:      #8F95B5;
  --ink-4:      #5C6188;

  --cobalt:     #8A97D5;       /* lift cobalt for AA on dark */
  --cobalt-2:   #A5AFE0;
  --cobalt-3:   #5364C0;
  --cobalt-tint:#1F2447;

  --magenta:    #DC8AC2;
  --magenta-2:  #E8A8D2;
  --magenta-3:  #C34FA2;
  --magenta-tint:#3A1A30;

  --plum:       #DC8AC2;       /* in dark, plum reads as soft pink */
  --plum-2:     #C34FA2;
  --sky:        #77B7F0;

  --rule:       #2C3158;
  --border:     #2C3158;
  --focus-ring: rgba(138, 151, 213, 0.55);

  --shadow-sm: 0 1px 0 rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 1px 0 rgba(0,0,0,.3), 0 6px 18px rgba(0,0,0,.45);
  --shadow-lg: 0 2px 0 rgba(0,0,0,.3), 0 14px 36px rgba(0,0,0,.55);
}

/* ----- Reset bits ----- */
* { box-sizing: border-box; }
body { margin: 0; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; }

/* ----- Layout ----- */
.wrap {
  width: 100%;
  max-width: var(--site-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
section { padding: var(--sp-20) 0; border-top: var(--hairline); }
section:first-of-type { border-top: 0; }

/* ----- Top nav ----- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--ice) 88%, transparent);
  -webkit-backdrop-filter: saturate(140%);
  backdrop-filter: saturate(140%);
  border-bottom: var(--hairline);
}
.nav-inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  color: var(--cobalt);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.005em;
  text-decoration: none;
  border: 0;
}
.brand:hover { border: 0; }
.brand-mark {
  width: 28px; height: 28px;
  flex: 0 0 28px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  margin-left: auto;
  font-size: 14px;
}
.nav-links a {
  color: var(--ink-2);
  border: 0;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--cobalt); border-bottom-color: transparent; }
.nav-links a.active { color: var(--cobalt); border-bottom-color: var(--magenta); }
.nav-links .gh {
  display: inline-flex; align-items: center; gap: 6px;
  border: var(--hairline);
  padding: 6px 12px;
  border-radius: var(--r-pill);
  color: var(--ink);
  background: var(--paper);
}
.nav-links .gh:hover {
  border-color: var(--cobalt);
  color: var(--cobalt);
}
.theme-toggle {
  border: var(--hairline);
  background: var(--paper);
  border-radius: var(--r-pill);
  padding: 6px 10px;
  color: var(--ink-2);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.theme-toggle:hover { color: var(--cobalt); border-color: var(--cobalt); }

/* ----- Eyebrow + title patterns ----- */
.section-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--magenta);
  margin-bottom: var(--sp-4);
}
.section-eyebrow::before {
  content: "";
  width: 22px; height: 1px; background: currentColor;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.05;
  color: var(--cobalt);
  margin: 0 0 var(--sp-4);
  letter-spacing: -0.01em;
}
.section-lede {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--plum);
  max-width: 60ch;
  margin: 0 0 var(--sp-12);
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: var(--r-md);
  border: var(--hairline);
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 120ms, color 120ms, background 120ms;
}
.btn:hover {
  border-color: var(--cobalt);
  color: var(--cobalt);
}
.btn-primary {
  background: var(--cobalt);
  border-color: var(--cobalt);
  color: #fff;
}
.btn-primary:hover {
  background: var(--cobalt-2);
  border-color: var(--cobalt-2);
  color: #fff;
}
[data-theme="dark"] .btn-primary { color: #0F1226; }

/* ----- Tables ----- */
.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.tbl th, .tbl td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: var(--hairline);
}
.tbl thead th {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 600;
  border-bottom: 1px solid var(--cobalt);
}
.tbl tbody tr:last-child td { border-bottom: 0; }
.tbl td code { font-size: 13px; }

/* ----- Tags / pills ----- */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: var(--cobalt-tint);
  color: var(--cobalt);
  border: 1px solid transparent;
}
.tag.ok    { background: color-mix(in srgb, var(--success) 15%, transparent); color: var(--success); }
.tag.warn  { background: color-mix(in srgb, var(--warning) 18%, transparent); color: #8F6212; }
.tag.muted { background: var(--ice-2); color: var(--ink-3); }
[data-theme="dark"] .tag.warn { color: #E8A23A; }

/* ----- Footer ----- */
footer.foot {
  border-top: var(--hairline);
  padding: var(--sp-12) 0 var(--sp-16);
  margin-top: var(--sp-16);
  color: var(--ink-3);
  font-size: 13px;
}
.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--sp-8);
}
.foot h5 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--magenta);
  margin: 0 0 var(--sp-4);
  font-weight: 600;
}
.foot a { color: var(--ink-2); border: 0; }
.foot a:hover { color: var(--cobalt); }
.foot-meta {
  margin-top: var(--sp-10);
  padding-top: var(--sp-5);
  border-top: var(--hairline);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-3);
}
@media (max-width: 720px) {
  .foot-grid { grid-template-columns: 1fr 1fr; }
}

/* ----- Code blocks: install commands ----- */
.cmd {
  background: var(--ice-2);
  border: var(--hairline);
  border-radius: var(--r-md);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}
.cmd .prompt { color: var(--magenta); user-select: none; }
.cmd .copy {
  margin-left: auto;
  border: var(--hairline);
  background: var(--paper);
  border-radius: var(--r-sm);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding: 5px 9px;
}
.cmd .copy:hover { color: var(--cobalt); border-color: var(--cobalt); }
.cmd .copy.ok { color: var(--success); border-color: var(--success); }

/* ----- Mobile ----- */
@media (max-width: 760px) {
  .nav-links { gap: var(--sp-3); }
  .nav-links a:not(.gh):not(.theme-toggle) { display: none; }
  section { padding: var(--sp-12) 0; }
}