/* ============================================================
   Vium — site styles
   Brand: "calibrated instrument" — deep ink, teal signal,
   amber disputed, violet unknown. Bricolage display + IBM Plex.
   ============================================================ */
:root{
  --ink:#0A111E;
  --ink-2:#0E1828;
  --panel:#152232;
  --panel-2:#1a2a3e;
  --line:#243349;
  --line-soft:#1c2a3c;
  --mist:#8A99B5;
  --mist-dim:#5C6A84;
  --paper:#EAF0F8;
  --signal:#34D8C4;
  --signal-2:#62ead9;
  --signal-dim:#1f8b80;
  --amber:#F2B45A;
  --violet:#9B8CFF;

  --display:'Bricolage Grotesque',Georgia,serif;
  --body:'IBM Plex Sans',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,Consolas,monospace;

  --container:1140px;
}

/* base ---------------------------------------------------- */
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--ink);color:var(--paper);
  font-family:var(--body);font-size:17px;line-height:1.6;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
/* ambient instrument grid */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(1100px 720px at 82% -8%, rgba(52,216,196,.10), transparent 60%),
    radial-gradient(900px 620px at -8% 112%, rgba(155,140,255,.08), transparent 55%),
    linear-gradient(transparent 0 calc(100% - 1px), rgba(36,51,73,.20) 100%) 0 0/100% 44px,
    linear-gradient(90deg, transparent 0 calc(100% - 1px), rgba(36,51,73,.14) 100%) 0 0/44px 100%;
}
.container{max-width:var(--container)}
a{color:var(--signal);text-decoration:none}
code{font-family:var(--mono);font-size:.86em;color:var(--paper);
  background:var(--ink-2);border:1px solid var(--line);border-radius:6px;padding:.08em .42em}
section,header,footer{position:relative;z-index:1}
em{font-style:normal;color:var(--paper)}

/* shared type ------------------------------------------- */
.v-eyebrow{font-family:var(--mono);font-size:.78rem;letter-spacing:.24em;text-transform:uppercase;
  color:var(--signal);margin:0 0 1.1rem;display:flex;align-items:center;gap:.7rem}
.v-eyebrow::before{content:"";width:26px;height:1px;background:var(--signal-dim)}
.v-display{font-family:var(--display);font-weight:800;letter-spacing:-.02em;line-height:1.0;
  font-size:clamp(2.6rem,6vw,5rem);margin:.2rem 0 1.2rem;text-wrap:balance}
.v-h2{font-family:var(--display);font-weight:700;letter-spacing:-.015em;line-height:1.06;
  font-size:clamp(1.9rem,3.8vw,3rem);margin:0 0 1rem;text-wrap:balance;max-width:18ch}
.v-accent{color:var(--signal)}
.v-lede{font-size:clamp(1.05rem,1.5vw,1.28rem);color:var(--mist);max-width:54ch;margin:0 0 1.8rem}
.v-lede strong{color:var(--paper);font-weight:600}
.v-lede.center{margin-left:auto;margin-right:auto}
.v-section-lede{font-size:1.12rem;color:var(--mist);max-width:62ch;margin:0 0 1rem}
.v-section-lede.small{font-size:.98rem;margin-top:1.6rem}

/* nav --------------------------------------------------- */
.v-nav{background:transparent;transition:background .3s,border-color .3s,backdrop-filter .3s;
  border-bottom:1px solid transparent;padding:.9rem 0}
.v-nav.scrolled{background:rgba(10,17,30,.82);backdrop-filter:blur(14px);
  border-bottom-color:var(--line-soft)}
.v-wordmark{font-family:var(--mono);font-weight:600;letter-spacing:.34em;font-size:1.05rem;
  color:var(--paper)!important}
.v-wordmark span{color:var(--signal)}
.v-wordmark.sm{font-size:1rem}
.v-nav .nav-link{font-family:var(--mono);font-size:.82rem;letter-spacing:.08em;color:var(--mist);
  text-transform:lowercase;padding:.4rem .85rem;transition:color .2s}
.v-nav .nav-link:hover,.v-nav .nav-link:focus{color:var(--paper)}
.navbar-toggler{border:1px solid var(--line);padding:.4rem .55rem}
.navbar-toggler:focus{box-shadow:0 0 0 3px rgba(52,216,196,.35)}
.v-burger,.v-burger::before,.v-burger::after{display:block;width:20px;height:2px;background:var(--paper);
  position:relative;transition:.2s}
.v-burger::before,.v-burger::after{content:"";position:absolute;left:0}
.v-burger::before{top:-6px}.v-burger::after{top:6px}

/* buttons ----------------------------------------------- */
.v-btn{font-family:var(--mono);font-size:.85rem;letter-spacing:.04em;font-weight:500;
  background:var(--signal);color:#04211d;border:1px solid var(--signal);
  padding:.7rem 1.4rem;border-radius:10px;transition:.2s}
.v-btn:hover{background:var(--signal-2);border-color:var(--signal-2);color:#04211d;
  transform:translateY(-1px);box-shadow:0 8px 24px -12px rgba(52,216,196,.7)}
.v-btn-ghost{font-family:var(--mono);font-size:.85rem;letter-spacing:.04em;
  background:transparent;color:var(--paper);border:1px solid var(--line);
  padding:.7rem 1.4rem;border-radius:10px;transition:.2s}
.v-btn-ghost:hover{border-color:var(--signal);color:var(--signal)}
.v-cta-row{display:flex;gap:.8rem;flex-wrap:wrap}
.v-cta-row.center{justify-content:center}

/* hero -------------------------------------------------- */
.v-hero{padding:9.5rem 0 5rem;position:relative}
.v-trust-legend{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;margin-top:2rem}
.v-legend-note{font-family:var(--mono);font-size:.74rem;color:var(--mist-dim);margin-left:.3rem}
.v-chip{font-family:var(--mono);font-size:.76rem;letter-spacing:.04em;padding:.32rem .7rem;border-radius:999px;
  border:1px solid var(--line);color:var(--mist);background:var(--ink-2);white-space:nowrap}
.v-chip.sm{font-size:.68rem;padding:.22rem .55rem}
.v-chip.ok{color:var(--signal);border-color:var(--signal-dim)}
.v-chip.warn{color:var(--amber);border-color:#7a5a25}
.v-chip.unk{color:var(--violet);border-color:#4a4080}
.v-scroll-cue{position:absolute;left:50%;bottom:1.4rem;transform:translateX(-50%);
  font-family:var(--mono);font-size:.68rem;letter-spacing:.3em;text-transform:uppercase;color:var(--mist-dim)}
.v-scroll-cue::after{content:"";display:block;width:1px;height:26px;margin:.5rem auto 0;
  background:linear-gradient(var(--mist-dim),transparent);animation:cue 2s ease-in-out infinite}
@keyframes cue{0%,100%{opacity:.3;transform:scaleY(.6)}50%{opacity:1;transform:scaleY(1)}}

/* signature: knowledge package -------------------------- */
.v-pkg{background:linear-gradient(180deg,var(--panel),var(--ink-2));
  border:1px solid var(--line);border-radius:18px;padding:1.5rem 1.5rem 1.3rem;
  box-shadow:0 40px 80px -40px rgba(0,0,0,.8);position:relative;overflow:hidden}
.v-pkg::before{content:"";position:absolute;inset:0 0 auto 0;height:2px;
  background:linear-gradient(90deg,var(--signal),var(--violet))}
.v-pkg-head{display:flex;justify-content:space-between;align-items:center;gap:1rem;
  font-family:var(--mono);font-size:.7rem;letter-spacing:.14em}
.v-pkg-id{color:var(--signal)}
.v-pkg-meta{color:var(--mist-dim)}
.v-pkg-query{font-family:var(--display);font-weight:500;font-size:1.18rem;margin:.7rem 0 1.2rem;color:var(--paper)}
.v-claim{margin-bottom:1rem}
.v-claim-top{display:flex;justify-content:space-between;gap:1rem;font-size:.95rem;margin-bottom:.4rem}
.v-claim-top b{font-family:var(--mono);font-variant-numeric:tabular-nums}
.v-claim-top b.ok{color:var(--signal)}.v-claim-top b.warn{color:var(--amber)}.v-claim-top b.unk{color:var(--violet)}
.v-bar{height:6px;background:var(--ink);border:1px solid var(--line-soft);border-radius:6px;overflow:hidden}
.v-bar i{display:block;height:100%;width:0;border-radius:6px;transition:width 1.1s cubic-bezier(.2,.7,.2,1)}
.v-bar i.ok{background:linear-gradient(90deg,var(--signal-dim),var(--signal))}
.v-bar i.warn{background:linear-gradient(90deg,#8a6320,var(--amber))}
.v-bar i.unk{background:linear-gradient(90deg,#4a4080,var(--violet))}
.v-claim-foot{display:flex;justify-content:space-between;align-items:center;gap:.6rem;margin-top:.45rem}
.v-src{font-family:var(--mono);font-size:.72rem;color:var(--mist-dim)}
.v-pkg-contract{font-family:var(--mono);font-size:.74rem;color:var(--mist);line-height:1.5;
  margin:.4rem 0 0;padding-top:1rem;border-top:1px dashed var(--line)}

/* sections ---------------------------------------------- */
.v-section{padding:6rem 0}
.v-band{background:linear-gradient(180deg,transparent,rgba(21,34,50,.5),transparent)}
.v-card{background:linear-gradient(180deg,var(--panel),var(--ink-2));border:1px solid var(--line);
  border-radius:16px;padding:1.6rem 1.5rem;height:100%;position:relative;transition:.25s}
.v-card:hover{transform:translateY(-3px);border-color:var(--signal-dim)}
.v-card.sm{padding:1.2rem 1.25rem}
.v-card.big{padding:2rem 1.9rem}
.v-card h3{font-family:var(--display);font-weight:700;font-size:1.35rem;margin:.1rem 0 .6rem;letter-spacing:-.01em}
.v-card.big h3{font-size:1.6rem}
.v-card p{color:var(--mist);margin:0;font-size:1rem}
.v-card.sm p{font-size:.92rem}
.v-k{font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--signal);display:block;margin-bottom:.7rem}
.v-card.warn .v-k{color:var(--amber)}
.v-card::after{content:"";position:absolute;left:0;top:1.5rem;bottom:1.5rem;width:3px;border-radius:3px;opacity:.8}
.v-card.sig::after{background:var(--signal)}
.v-card.warn::after{background:var(--amber)}

.v-pull{font-family:var(--display);font-weight:700;font-size:clamp(1.6rem,3.4vw,2.6rem);
  text-align:center;margin:3.2rem auto 0;max-width:20ch;letter-spacing:-.015em;text-wrap:balance}
.v-pull-mini{font-family:var(--display);font-weight:700;font-size:1.25rem;color:var(--paper);
  margin:1.4rem 0 0;border-left:3px solid var(--signal);padding-left:1rem}

/* how it works — interactive ---------------------------- */
.v-toggle{display:inline-flex;background:var(--ink-2);border:1px solid var(--line);border-radius:12px;
  padding:.3rem;margin:1.6rem 0 1.2rem;gap:.3rem}
.v-toggle-btn{font-family:var(--mono);font-size:.85rem;letter-spacing:.04em;color:var(--mist);
  background:transparent;border:0;padding:.6rem 1.3rem;border-radius:9px;cursor:pointer;transition:.2s}
.v-toggle-btn:hover{color:var(--paper)}
.v-toggle-btn.is-active{background:var(--signal);color:#04211d;font-weight:500}
#tab-bare.is-active{background:#3a3140;color:var(--amber)}
.v-answer{display:none;background:linear-gradient(180deg,var(--panel),var(--ink-2));
  border:1px solid var(--line);border-radius:16px;padding:1.6rem 1.7rem;max-width:760px}
.v-answer.is-active{display:block;animation:fade .35s ease}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.v-ans-q{font-family:var(--mono);font-size:.82rem;color:var(--mist-dim);margin:0 0 .9rem;letter-spacing:.02em}
.v-ans-body{font-size:1.12rem;line-height:1.65;margin:0 0 1rem}
.v-ans-body.bare{color:var(--mist)}
.v-cite{font-family:var(--mono);font-size:.82rem}
.v-cite.ok{color:var(--signal)}.v-cite.warn{color:var(--amber)}.v-cite.unk{color:var(--violet)}
.v-ans-flag{font-family:var(--mono);font-size:.82rem;margin:0;padding-top:.9rem;border-top:1px solid var(--line)}
.v-ans-flag.bad{color:var(--amber)}
.v-ans-flag.good{color:var(--signal)}

.v-steps{display:flex;align-items:stretch;gap:.6rem;flex-wrap:wrap;margin-top:2.4rem}
.v-step{flex:1;min-width:150px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:1.1rem 1.1rem}
.v-step-n{font-family:var(--mono);font-size:.72rem;color:var(--mist-dim);letter-spacing:.14em}
.v-step h4{font-family:var(--display);font-weight:700;font-size:1.15rem;margin:.35rem 0 .4rem}
.v-step p{color:var(--mist);font-size:.9rem;margin:0}
.v-step-arrow{align-self:center;color:var(--signal-dim);font-family:var(--mono);font-size:1.2rem}

/* examples — with / without ----------------------------- */
.v-ex{margin-top:2.4rem}
.v-ex:first-of-type{margin-top:2rem}
.v-ex-q{font-family:var(--display);font-weight:700;letter-spacing:-.01em;
  font-size:clamp(1.15rem,2.1vw,1.55rem);margin:0 0 1rem}
.v-ex-pair{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.v-ex-card{border:1px solid var(--line);border-radius:14px;padding:1.25rem 1.35rem;background:var(--ink-2);
  display:flex;flex-direction:column}
.v-ex-card.without{border-left:3px solid var(--amber)}
.v-ex-card.with{border-left:3px solid var(--signal);background:linear-gradient(180deg,var(--panel),var(--ink-2))}
.v-ex-tag{font-family:var(--mono);font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;
  display:block;margin-bottom:.7rem}
.v-ex-tag.bad{color:var(--amber)}
.v-ex-tag.good{color:var(--signal)}
.v-ex-card p{margin:0 0 1rem;font-size:1.02rem;line-height:1.55;flex:1}
.v-ex-card.without p{color:var(--mist)}
.v-ex-note{font-family:var(--mono);font-size:.78rem;line-height:1.5;display:block;
  padding-top:.8rem;border-top:1px solid var(--line)}
.v-ex-note.bad{color:var(--amber)}
.v-ex-note.ok{color:var(--signal)}

/* live data --------------------------------------------- */
.v-feeds{display:flex;flex-wrap:wrap;gap:.6rem;margin:.2rem 0 .6rem}
.v-chip.live{color:var(--paper);border-color:var(--signal-dim);position:relative;padding-left:1.5rem}
.v-chip.live::before{content:"";position:absolute;left:.65rem;top:50%;margin-top:-3.5px;
  width:7px;height:7px;border-radius:50%;background:var(--signal);
  box-shadow:0 0 0 0 rgba(52,216,196,.6);animation:livepulse 1.9s ease-out infinite}
@keyframes livepulse{
  0%{box-shadow:0 0 0 0 rgba(52,216,196,.55)}
  70%{box-shadow:0 0 0 7px rgba(52,216,196,0)}
  100%{box-shadow:0 0 0 0 rgba(52,216,196,0)}
}
.v-cite.live{color:var(--signal)}

/* integration — vium=true ------------------------------- */
.v-flag{font-family:var(--mono);font-size:.92em;color:var(--signal);background:var(--ink-2);
  border:1px solid var(--signal-dim);border-radius:6px;padding:.06em .45em;white-space:nowrap}
.v-integrate-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:1.8rem;align-items:center;margin-top:1.8rem}
.v-code{background:#0a1422;border:1px solid var(--line);border-radius:14px;padding:1.3rem 1.45rem;
  overflow-x:auto;font-family:var(--mono);font-size:.9rem;line-height:1.75;color:#c7d4ea;margin:0}
.v-code.narrow{max-width:440px;margin-top:1.3rem}
.v-code .c{color:var(--mist-dim)}
.v-code .kw{color:var(--violet)}
.v-code .fn{color:var(--paper);font-weight:600}
.v-code .st{color:var(--amber)}
.v-code .flag{color:var(--signal);font-weight:600}
.v-int-points{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:1.1rem}
.v-int-points li{position:relative;padding-left:1.5rem;color:var(--mist);line-height:1.55}
.v-int-points li::before{content:"";position:absolute;left:0;top:.52em;width:9px;height:9px;
  border-radius:50%;background:var(--signal)}
.v-int-points li b{color:var(--paper);font-weight:600}

/* timeline ---------------------------------------------- */
.v-timeline{list-style:none;margin:2.4rem 0 0;padding:0;position:relative}
.v-timeline::before{content:"";position:absolute;left:9px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(var(--signal-dim),var(--line),var(--violet))}
.v-timeline li{position:relative;padding:0 0 1.8rem 2.6rem;display:flex;flex-direction:column;gap:.5rem}
.v-timeline li::before{content:"";position:absolute;left:2px;top:4px;width:16px;height:16px;border-radius:50%;
  background:var(--ink);border:2px solid var(--signal-dim)}
.v-timeline li.hero-step::before{border-color:var(--signal);background:var(--signal);
  box-shadow:0 0 0 5px rgba(52,216,196,.18)}
.v-phase{font-family:var(--mono);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--signal)}
.v-timeline h4{font-family:var(--display);font-weight:700;font-size:1.3rem;margin:0}
.v-timeline li.hero-step h4{color:var(--signal)}
.v-timeline p{color:var(--mist);margin:0;max-width:64ch}

/* cta --------------------------------------------------- */
.v-cta-section{padding:7rem 0;text-align:center;
  background:radial-gradient(700px 380px at 50% 30%, rgba(52,216,196,.10), transparent 70%)}
.v-display.cta{font-size:clamp(2.4rem,5.5vw,4.4rem)}

/* footer ------------------------------------------------ */
.v-footer{border-top:1px solid var(--line-soft);padding:3rem 0;background:var(--ink-2)}
.v-foot-note{color:var(--mist);font-size:.95rem;margin:.6rem 0 0}
.v-foot-links{list-style:none;display:flex;gap:1.4rem;flex-wrap:wrap;padding:0;margin:0 0 .8rem;
  justify-content:flex-start}
.v-foot-links a{font-family:var(--mono);font-size:.82rem;color:var(--mist);letter-spacing:.04em}
.v-foot-links a:hover{color:var(--signal)}
.v-foot-mail{display:inline-block;font-family:var(--mono);font-size:.84rem;letter-spacing:.02em;
  color:var(--signal);margin:0 0 .55rem;transition:color .2s}
.v-foot-mail:hover{color:var(--signal-2)}
.v-foot-copy{font-family:var(--mono);font-size:.74rem;color:var(--mist-dim);margin:0}
@media (min-width:768px){.v-foot-links{justify-content:flex-end}.v-footer .col-md-6:last-child{text-align:right}}

/* reveal animation -------------------------------------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}
.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}
.reveal.d4{transition-delay:.32s}

/* responsive -------------------------------------------- */
@media (max-width:991px){
  .v-hero{padding:8rem 0 4rem}
  .v-pkg{margin-top:1rem}
  .v-step-arrow{display:none}
  .v-integrate-grid{grid-template-columns:1fr;gap:1.3rem}
}
@media (max-width:700px){
  .v-ex-pair{grid-template-columns:1fr}
}
@media (max-width:575px){
  body{font-size:16px}
  .v-section{padding:4.5rem 0}
  .v-toggle{width:100%}.v-toggle-btn{flex:1}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .v-bar i{transition:none}
  .v-scroll-cue::after{animation:none}
  .v-chip.live::before{animation:none}
}