/* ─── Umbra Core · v2 (shared design tokens + primitives across all v2 pages) ─── */

:root {
  /* Phenomenon surfaces */
  --void:        #040608;
  --deep-space:  #080C14;
  --nebula:      #0D1526;
  --stratum:     #162039;
  --ghost:       #1E2A42;

  /* Stellar series */
  --corona:      #F2F6FF;
  --stellar:     #A8B8D8;
  --dim:         #4A5A7A;

  --edge:        rgba(168,184,216,0.08);
  --edge-strong: rgba(168,184,216,0.16);

  /* Signal series */
  --signal:      #4D9EFF;
  --ultraviolet: #7B68EE;
  --infrared:    #FF6B4A;

  /* Sub-brand spectrum (Media Kit 2026.04) */
  --wl-indietheka: #FF4DA6;  /* 560 nm · Magenta · Editorial */
  --wl-orbit:      #7B68EE;  /* 425 nm · UV · Platform */
  --wl-transit:    #4D9EFF;  /* 475 nm · Signal · Service */
  --wl-studio:     #4DFF7A;  /* 530 nm · Green · Consulting */
  --wl-radiohead:  #FF4444;  /* 700 nm · IR · Community */

  /* Type stacks — IBM Plex trio */
  --serif: 'IBM Plex Serif', Georgia, serif;
  --sans:  'IBM Plex Sans', system-ui, sans-serif;
  --mono:  'IBM Plex Mono', ui-monospace, Menlo, monospace;

  /* Column — tighter document feel */
  --maxw: 1280px;
  --rail: 240px;
}

/* Tweak-driven overrides */
html[data-type="plex_full"]   { --serif:'IBM Plex Serif',Georgia,serif;        --sans:'IBM Plex Sans',system-ui,sans-serif; --mono:'IBM Plex Mono',monospace; }
html[data-type="plex_mono"]   { --serif:'IBM Plex Mono',ui-monospace,monospace; --sans:'IBM Plex Sans',system-ui,sans-serif; --mono:'IBM Plex Mono',monospace; }
html[data-type="serif_heavy"] { --serif:'IBM Plex Serif',Georgia,serif;        --sans:'IBM Plex Serif',Georgia,serif;       --mono:'IBM Plex Mono',monospace; }
html[data-density="compact"]  { --maxw: 1200px; }
html[data-density="comfy"]    { --maxw: 1400px; }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--void); color: var(--corona); }
body {
  font-family: var(--sans);
  font-weight: 300;
  font-size: 14.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  cursor: none;
}
@media (hover: none) { body { cursor: auto; } }

::selection { background: var(--signal); color: var(--void); }

/* Cosmos background — graticule grid + stars */
.cosmos {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(77,158,255,0.07), transparent 55%),
    radial-gradient(ellipse at 80% 80%, rgba(123,104,238,0.05), transparent 55%),
    radial-gradient(ellipse at 50% 50%, var(--deep-space), var(--void) 70%);
}
.cosmos::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(168,184,216,0.035) 0.5px, transparent 0.5px),
    linear-gradient(to bottom, rgba(168,184,216,0.035) 0.5px, transparent 0.5px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 85%);
}
.cosmos::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(1px 1px at 13% 27%, rgba(242,246,255,0.5), transparent),
    radial-gradient(1px 1px at 72% 18%, rgba(242,246,255,0.35), transparent),
    radial-gradient(1px 1px at 44% 73%, rgba(242,246,255,0.4), transparent),
    radial-gradient(1px 1px at 88% 55%, rgba(242,246,255,0.3), transparent),
    radial-gradient(1px 1px at 25% 88%, rgba(242,246,255,0.35), transparent),
    radial-gradient(1px 1px at 63% 42%, rgba(242,246,255,0.25), transparent),
    radial-gradient(1px 1px at 92% 12%, rgba(242,246,255,0.4), transparent),
    radial-gradient(1px 1px at 8% 63%, rgba(242,246,255,0.35), transparent);
  opacity: 0.65;
}

main { position: relative; z-index: 1; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 44px; }

/* ── Chrome (shared across v2 pages) ── */
.chrome {
  position: fixed; top: 2px; left: 0; right: 0; z-index: 50;
  padding: 16px 44px;
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 32px;
  backdrop-filter: blur(14px);
  background: linear-gradient(to bottom, rgba(4,6,8,0.9), rgba(4,6,8,0.5));
  border-bottom: 1px solid var(--edge);
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
}
.brand-mark { display: flex; align-items: center; gap: 12px; color: var(--corona); text-decoration: none; }
.brand-mark .eclipse { width: 22px; height: 22px; }
.brand-mark .wm { font-family: var(--sans); font-weight: 500; font-size: 14px; letter-spacing: 0.04em; text-transform: none; color: var(--corona); }
.brand-mark .wm b { color: var(--stellar); font-weight: 500; }
.brand-mark .sep { color: var(--dim); margin: 0 4px; }
.brand-mark .sub-label { color: var(--signal); font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; }
.brand-mark .sub-label.studio { color: var(--wl-studio); }
.nav { display: flex; justify-content: center; gap: 26px; color: var(--stellar); }
.nav a { color: inherit; text-decoration: none; transition: color .2s; position: relative; }
.nav a:hover { color: var(--corona); }
.nav a::before { content: ""; position: absolute; left: -10px; top: 50%; width: 3px; height: 3px; background: var(--dim); border-radius: 50%; transform: translateY(-50%); }
.chrome-right { display: flex; align-items: center; gap: 16px; color: var(--dim); }
.chrome-right a { color: var(--stellar); text-decoration: none; }
.chrome-right a:hover { color: var(--corona); }

/* Language toggle (EN | ES) */
.lang-toggle {
  display: inline-flex; align-items: center; gap: 0;
  border: 1px solid var(--edge-strong);
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase;
  user-select: none; flex-shrink: 0;
}
.lang-toggle [data-lang-opt] {
  background: transparent; border: none; padding: 5px 9px; color: var(--dim);
  font: inherit; letter-spacing: inherit; text-transform: inherit;
  cursor: none; transition: color .2s, background .2s;
}
@media (hover: none) { .lang-toggle [data-lang-opt] { cursor: pointer; } }
.lang-toggle [data-lang-opt]:hover { color: var(--stellar); }
.lang-toggle [data-lang-opt].is-active { color: var(--void); background: var(--signal); }
html[data-page="studio"] .lang-toggle [data-lang-opt].is-active { background: var(--wl-studio); }
html[data-page="lighthouse"] .lang-toggle [data-lang-opt].is-active { background: var(--wl-studio); }

/* Spectral strip (fixed top, motif) */
.spectrum-strip { position: fixed; top: 0; left: 0; right: 0; z-index: 60; height: 2px; display: flex; }
.spectrum-strip span { flex: 1; opacity: 0.55; transition: flex .8s cubic-bezier(.2,.7,.2,1), opacity .4s; }
.spectrum-strip span.active { flex: 1.8; opacity: 1; }

/* Section primitives */
section { padding: 120px 0; position: relative; }
.section-head {
  display: grid; grid-template-columns: 1fr 2fr; gap: 64px; align-items: baseline;
  padding-bottom: 40px; border-bottom: 1px solid var(--edge);
  margin-bottom: 64px;
}
.section-label {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--dim); display: flex; align-items: center; gap: 14px;
}
.section-label b { color: var(--signal); font-weight: 500; }
.section-label::before { content: ""; width: 24px; height: 1px; background: var(--signal); }
.section-title {
  font-family: var(--serif); font-weight: 300; font-style: italic;
  font-size: clamp(38px, 4.4vw, 56px);
  line-height: 1.05; letter-spacing: -0.015em; color: var(--corona); margin: 0;
  text-wrap: balance;
}
.section-title .roman { font-style: normal; color: var(--stellar); }
.section-title .signal { color: var(--signal); }
.section-title .studio { color: var(--wl-studio); }

/* Button system */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 20px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  border: 1px solid var(--edge-strong); color: var(--corona); background: transparent;
  cursor: none; text-decoration: none; transition: all .22s ease; font-weight: 400;
}
.btn:hover { background: var(--corona); color: var(--void); border-color: var(--corona); }
.btn.primary { border-color: var(--signal); color: var(--signal); }
.btn.primary:hover { background: var(--signal); color: var(--void); }
.btn.studio { border-color: var(--wl-studio); color: var(--wl-studio); }
.btn.studio:hover { background: var(--wl-studio); color: var(--void); }

/* Footer (shared) */
footer.v2-foot { border-top: 1px solid var(--edge); padding: 72px 0 40px; position: relative; z-index: 1; }
.foot-spectrum { margin-bottom: 40px; display: flex; height: 2px; }
.foot-spectrum span { flex: 1; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 56px; margin-bottom: 64px; }
.foot-grid h4 { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--dim); margin: 0 0 16px 0; font-weight: 400; }
.foot-grid ul { list-style: none; padding: 0; margin: 0; }
.foot-grid li { margin-bottom: 8px; }
.foot-grid a { color: var(--stellar); text-decoration: none; font-size: 13.5px; transition: color .2s; }
.foot-grid a:hover { color: var(--corona); }
.foot-brand { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
.foot-brand .wm { font-family: var(--sans); font-weight: 500; font-size: 20px; color: var(--corona); letter-spacing: 0.02em; }
.foot-brand .wm b { color: var(--stellar); font-weight: 500; }
.foot-brand-sub { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--dim); }
.foot-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 28px; border-top: 1px solid var(--edge);
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--dim);
}

/* Tweaks panel (shared) */
.tweaks-panel {
  position: fixed; bottom: 20px; right: 20px; z-index: 100;
  background: rgba(8,12,20,0.94); backdrop-filter: blur(14px);
  border: 1px solid var(--edge-strong);
  padding: 16px; width: 280px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em;
  display: none;
}
.tweaks-panel.open { display: block; }
.tweaks-panel h5 {
  margin: 0 0 14px 0; color: var(--dim); font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase;
  font-weight: 400; display: flex; justify-content: space-between; align-items: center;
}
.tweaks-panel h5 b { color: var(--signal); font-weight: 400; }
.tweak-group { margin-bottom: 14px; }
.tweak-group > label { display: block; color: var(--stellar); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; margin-bottom: 8px; }
.tweak-buttons { display: flex; gap: 4px; flex-wrap: wrap; }
.tweak-buttons button {
  flex: 1; padding: 7px 8px; background: transparent; border: 1px solid var(--edge);
  color: var(--stellar); font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em;
  text-transform: uppercase; cursor: none; transition: all .18s;
}
.tweak-buttons button:hover { color: var(--corona); border-color: var(--edge-strong); }
.tweak-buttons button.active { color: var(--signal); border-color: var(--signal); }

/* Page indicator (dot-column, right edge) */
.page-nav {
  position: fixed; right: 18px; top: 50%; transform: translateY(-50%);
  display: flex; flex-direction: column; gap: 10px; z-index: 30;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; color: var(--dim);
}
.page-nav a {
  color: inherit; text-decoration: none; display: flex; align-items: center; gap: 8px;
  padding: 3px 0; transition: color .2s;
}
.page-nav a::before {
  content: ""; width: 16px; height: 1px; background: var(--dim); transition: all .3s; opacity: 0.5;
}
.page-nav a:hover, .page-nav a.active { color: var(--corona); }
.page-nav a.active::before { width: 34px; background: var(--signal); opacity: 1; }

@media (max-width: 960px) {
  .wrap { padding: 0 22px; }
  .chrome { padding: 14px 20px; grid-template-columns: auto 1fr auto; }
  .nav { display: none; }
  .section-head { grid-template-columns: 1fr; gap: 20px; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .page-nav { display: none; }
  body { cursor: auto; }

  /* On mobile, chrome-right is hidden but the lang toggle should remain visible */
  .chrome-right { display: none; }
  .chrome .lang-toggle { display: inline-flex; }
  .lang-toggle [data-lang-opt] { padding: 4px 7px; font-size: 9.5px; letter-spacing: 0.14em; }
}