/* ==========================================================================
   Tileterra Systems — Deep Current v4
   Palette unchanged. Type, scale, grid and chrome rebuilt for a consulting
   practice rather than a product launch: restrained display face, editorial
   two-column grid, small radii, real information density.
   ========================================================================== */

:root{
  --deep:#030B12; --haze:#07141F; --panel:#0A1922; --edge:#123041;
  --edge-soft:#0E2431;
  --text:#E6F1F8; --body:#9FB8C9; --dim:#6C8CA0;
  --a1:#19E3C2; --a2:#3E8BFF;
  --a1-rgb:25,227,194; --a2-rgb:62,139,255;
  --ledger:#F2C14E; --ledger-rgb:242,193,78;
  --warn:#FF6B5D;

  --display:'Archivo',system-ui,-apple-system,sans-serif;
  --sans:'Inter',system-ui,-apple-system,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;

  --wrap:1240px;
  --gut:40px;
  --r:8px; --r-lg:12px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{background:var(--deep);color:var(--text);font-family:var(--sans);
  font-size:16px;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased;
  font-feature-settings:'kern' 1,'liga' 1,'cv05' 1}
::selection{background:var(--a1);color:var(--deep)}

a{color:var(--a1);text-decoration:none;transition:color .18s}
a:hover{color:var(--a2)}
:focus-visible{outline:2px solid var(--a1);outline-offset:2px;border-radius:3px}

.skip{position:absolute;left:-9999px;background:var(--a1);color:var(--deep);
  padding:12px 18px;z-index:300;border-radius:var(--r);font-weight:600}
.skip:focus{left:16px;top:16px}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut);position:relative;z-index:2}
@media(max-width:700px){:root{--gut:22px}}

/* ---------------------------------------------------------- backdrop
   Dots and links only. The asset icons are gone: at scale they read as
   clipart and undercut the seriousness of everything around them. */

#graph{position:fixed;inset:0;z-index:0;opacity:.3;pointer-events:none}
.vignette{position:fixed;inset:0;z-index:1;pointer-events:none;
  background:radial-gradient(ellipse 120% 80% at 70% 0%,transparent 30%,var(--deep) 88%)}

/* ---------------------------------------------------------- top bar */

.bar{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--deep) 88%,transparent);
  backdrop-filter:blur(14px);border-bottom:1px solid var(--edge-soft)}
.bar-in{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut);
  display:flex;align-items:center;justify-content:space-between;height:64px;gap:32px}
.brand{font-family:var(--display);font-weight:600;font-size:15px;letter-spacing:.06em;
  color:var(--text);text-transform:uppercase;white-space:nowrap}
.brand:hover{color:var(--text)}
.brand i{color:var(--a1);font-style:normal}
.bar-nav{display:flex;align-items:center;gap:4px}
.bar-nav a{font-size:14px;color:var(--body);padding:7px 13px;border-radius:var(--r);
  font-weight:450;transition:.18s}
.bar-nav a:hover{color:var(--text);background:var(--edge-soft)}
.bar-nav a[aria-current="page"]{color:var(--a1)}
.bar-cta{font-size:13.5px;font-weight:600;color:var(--deep);background:var(--a1);
  padding:9px 18px;border-radius:var(--r);white-space:nowrap;transition:.18s}
.bar-cta:hover{background:#3AECD0;color:var(--deep)}
.bar-toggle{display:none;background:none;border:1px solid var(--edge);border-radius:var(--r);
  width:38px;height:34px;cursor:pointer;align-items:center;justify-content:center}
.bar-toggle i{display:block;width:14px;height:1.5px;background:var(--text);position:relative}
.bar-toggle i::before,.bar-toggle i::after{content:'';position:absolute;left:0;width:14px;height:1.5px;background:var(--text)}
.bar-toggle i::before{top:-5px}.bar-toggle i::after{top:5px}
.bar-right{display:flex;align-items:center;gap:14px}

@media(max-width:900px){
  .bar-toggle{display:flex}
  .bar-nav{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;
    align-items:stretch;gap:0;background:var(--haze);border-bottom:1px solid var(--edge);
    padding:8px var(--gut) 16px}
  .bar-nav.open{display:flex}
  .bar-nav a{padding:12px 0;border-bottom:1px solid var(--edge-soft);border-radius:0;font-size:15px}
}

/* ---------------------------------------------------------- type */

h1,h2,h3,h4{font-family:var(--display);font-weight:600;letter-spacing:-.021em;
  line-height:1.1;text-wrap:balance;color:var(--text)}
h1{font-size:clamp(31px,3.15vw,46px);line-height:1.08;max-width:19ch;margin-bottom:22px}
h2{font-size:clamp(23px,2vw,30px);max-width:26ch;margin-bottom:14px}
h3{font-size:17px;font-weight:600;letter-spacing:-.012em;margin-bottom:8px}
h4{font-size:13px;font-weight:600}
p{margin-bottom:14px}
p:last-child{margin-bottom:0}
strong{color:var(--text);font-weight:600}

.grad{color:var(--a1)}

.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--dim);margin-bottom:18px;display:flex;align-items:center;gap:9px}
.eyebrow::before{content:'';width:16px;height:1px;background:var(--a1);flex:none}

.lead{font-size:17px;line-height:1.65;color:var(--body);max-width:52ch}
.sub{font-size:15.5px;line-height:1.65;color:var(--body);max-width:60ch;margin-bottom:38px}

/* ---------------------------------------------------------- hero */

.hero{padding:88px 0 76px;border-bottom:1px solid var(--edge-soft)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  gap:64px;align-items:center}
.hero .lead{margin-bottom:30px}
.hero-sm{padding:72px 0 44px;border-bottom:1px solid var(--edge-soft)}
.hero-sm h1{max-width:22ch;margin-bottom:18px}
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero{padding:64px 0 58px}
  .hero-sm{padding:56px 0 36px}
}

/* status line under the hero */
.statline{display:flex;flex-wrap:wrap;gap:0;border-top:1px solid var(--edge-soft);margin-top:56px}
.statline div{flex:1 1 190px;padding:22px 26px 22px 0;border-right:1px solid var(--edge-soft)}
.statline div:last-child{border-right:0}
.statline b{display:block;font-family:var(--display);font-weight:600;font-size:25px;
  letter-spacing:-.02em;color:var(--a1);margin-bottom:5px;line-height:1}
.statline span{font-size:13px;line-height:1.5;color:var(--dim);display:block}
@media(max-width:700px){.statline div{border-right:0;border-bottom:1px solid var(--edge-soft);padding:18px 0}}

/* ---------------------------------------------------------- buttons */

.actions{display:flex;gap:10px;flex-wrap:wrap}
.btn{font-family:var(--sans);font-size:14px;font-weight:600;padding:11px 22px;
  border-radius:var(--r);border:1px solid transparent;cursor:pointer;
  display:inline-block;transition:.18s;line-height:1.4}
.btn-solid{background:var(--a1);color:var(--deep)}
.btn-solid:hover{background:#3AECD0;color:var(--deep)}
.btn-ghost{color:var(--text);border-color:var(--edge);background:transparent}
.btn-ghost:hover{border-color:var(--a1);color:var(--a1)}
.btn[disabled]{opacity:.45;cursor:not-allowed}

/* ---------------------------------------------------------- sections */

section{padding:76px 0;position:relative}
section+section{border-top:1px solid var(--edge-soft)}
@media(max-width:700px){section{padding:56px 0}}

.sec-head{margin-bottom:40px}

/* editorial two-column: label left, content right */
.split{display:grid;grid-template-columns:200px minmax(0,1fr);gap:56px;align-items:start}
@media(max-width:860px){.split{grid-template-columns:1fr;gap:24px}}

/* ---------------------------------------------------------- panels */

.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:1px;
  background:var(--edge-soft);border:1px solid var(--edge-soft);border-radius:var(--r-lg);overflow:hidden}
.cell{background:var(--deep);padding:28px 26px;display:flex;flex-direction:column;
  transition:background .25s}
.cell:hover{background:var(--haze)}
.cell-n{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--a1);margin-bottom:16px}
.cell p{font-size:14.5px;line-height:1.62;color:var(--body)}
.cell ul{margin:12px 0 0;padding-left:16px;font-size:14px;line-height:1.6;color:var(--body)}
.cell li{margin-bottom:6px}
.cell .more{font-family:var(--mono);font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;
  margin-top:auto;padding-top:20px}

/* layer stack — the audit sequence, ordered top-down */
.layers{border:1px solid var(--edge);border-radius:var(--r-lg);overflow:hidden;background:var(--haze)}
.layers-head{padding:13px 22px;border-bottom:1px solid var(--edge);font-family:var(--mono);
  font-size:10.5px;letter-spacing:.14em;color:var(--dim);display:flex;justify-content:space-between;gap:12px}
.layer{display:grid;grid-template-columns:64px minmax(0,1fr);gap:18px;padding:18px 22px;
  border-bottom:1px solid var(--edge-soft);transition:background .22s}
.layer:last-child{border-bottom:0}
.layer:hover{background:var(--panel)}
.layer-n{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--dim);
  padding-top:3px;position:relative}
.layer-n::after{content:'';position:absolute;right:-9px;top:2px;width:2px;height:calc(100% + 14px);
  border-radius:2px;background:var(--a1)}
.layer:nth-child(3) .layer-n::after{background:#2ACBC9}
.layer:nth-child(4) .layer-n::after{background:#35ADDF}
.layer:nth-child(5) .layer-n::after{background:var(--a2)}
.layer h3{font-size:15.5px;margin-bottom:3px}
.layer p{font-size:13.5px;line-height:1.55;color:var(--body)}

/* ledger table */
.beam{border:1px solid var(--edge);border-radius:var(--r-lg);overflow:hidden;background:var(--haze)}
.beam-head{padding:13px 24px;border-bottom:1px solid var(--edge);display:flex;
  justify-content:space-between;gap:14px;font-family:var(--mono);font-size:10.5px;
  color:var(--ledger);letter-spacing:.14em}
.beam-row{display:grid;grid-template-columns:132px minmax(0,1fr) 118px;gap:20px;padding:16px 24px;
  border-bottom:1px solid var(--edge-soft);font-size:14.5px;line-height:1.55;color:var(--body);
  align-items:baseline;transition:background .22s}
.beam-row:hover{background:var(--panel)}
.beam-row:last-child{border-bottom:0}
.b-sys{font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--ledger)}
.b-proof{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;color:var(--dim);text-align:right}
@media(max-width:760px){.beam-row{grid-template-columns:1fr;gap:5px}.b-proof{text-align:left}}

/* case entries */
.case{display:grid;grid-template-columns:minmax(0,1fr) 210px;gap:40px;padding:26px 0;
  border-bottom:1px solid var(--edge-soft);align-items:start}
.case:last-child{border-bottom:0}
.case-tag{font-family:var(--mono);font-size:10.5px;letter-spacing:.13em;color:var(--dim);margin-bottom:9px}
.case h3{margin-bottom:6px}
.case p{font-size:14.5px;line-height:1.62;color:var(--body)}
.case-m{font-family:var(--mono);font-size:14px;color:var(--a1);text-align:right}
.case-m small{display:block;font-size:10px;letter-spacing:.1em;color:var(--dim);margin-top:6px}
@media(max-width:760px){.case{grid-template-columns:1fr;gap:14px}.case-m{text-align:left}}

/* ---------------------------------------------------------- prose */

.prose{max-width:68ch}
.prose h2{font-size:clamp(20px,1.7vw,25px);margin-top:44px;margin-bottom:12px;max-width:30ch}
.prose h3{margin-top:28px;font-size:16px}
.prose p{color:var(--body);font-size:16px;line-height:1.72}
.prose ul,.prose ol{margin:0 0 16px;padding-left:19px;color:var(--body);line-height:1.7}
.prose li{margin-bottom:8px}
.prose code{font-family:var(--mono);font-size:.88em;background:var(--haze);
  border:1px solid var(--edge);border-radius:4px;padding:2px 6px;color:var(--a1)}
.answer{border-left:2px solid var(--a1);background:var(--haze);border-radius:0 var(--r) var(--r) 0;
  padding:22px 26px;margin-bottom:34px;font-size:16.5px;line-height:1.65;color:var(--text)}

/* ---------------------------------------------------------- forms */

.form{max-width:620px}
.field{margin-bottom:20px}
.field label{display:block;font-family:var(--mono);font-size:10.5px;letter-spacing:.13em;
  text-transform:uppercase;color:var(--dim);margin-bottom:8px}
.field label .hint{text-transform:none;letter-spacing:0;color:var(--edge)}
.form-input,.form-select,.form-textarea{width:100%;font-family:var(--sans);font-size:15.5px;
  padding:12px 14px;color:var(--text);background:var(--haze);border:1px solid var(--edge);
  border-radius:var(--r);min-height:46px;transition:.18s}
.form-select{appearance:none;
  background-image:linear-gradient(45deg,transparent 50%,var(--dim) 50%),linear-gradient(135deg,var(--dim) 50%,transparent 50%);
  background-position:calc(100% - 19px) 21px,calc(100% - 13px) 21px;
  background-size:6px 6px;background-repeat:no-repeat;padding-right:42px}
.form-select option{background:var(--haze);color:var(--text)}
.form-textarea{min-height:160px;resize:vertical;line-height:1.6}
.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--a1);outline:none;
  box-shadow:0 0 0 3px rgba(var(--a1-rgb),.1)}
.form-input::placeholder,.form-textarea::placeholder{color:#2C4A5C}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:620px){.form-row{grid-template-columns:1fr;gap:0}}
#form-status{margin-top:16px;font-size:15px}

/* ---------------------------------------------------------- cta band */

.band{border-top:1px solid var(--edge-soft);background:var(--haze)}
.band .wrap{padding-top:64px;padding-bottom:64px}
.band h2{margin-bottom:12px}

/* ---------------------------------------------------------- footer */

footer{border-top:1px solid var(--edge-soft);padding:52px 0 32px;position:relative;
  z-index:2;background:var(--deep)}
.foot-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:36px;margin-bottom:44px}
@media(max-width:820px){.foot-grid{grid-template-columns:1fr 1fr;gap:30px}}
@media(max-width:520px){.foot-grid{grid-template-columns:1fr}}
.foot-grid h4{font-family:var(--mono);font-size:10.5px;letter-spacing:.15em;text-transform:uppercase;
  color:var(--dim);margin-bottom:15px;font-weight:400}
.foot-grid p{font-size:14px;line-height:1.6;color:var(--body);max-width:280px}
.foot-grid ul{list-style:none}
.foot-grid li{margin-bottom:8px}
.foot-grid li a{font-size:14px;color:var(--body)}
.foot-grid li a:hover{color:var(--a1)}
.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;
  font-family:var(--mono);font-size:11px;color:var(--dim);
  border-top:1px solid var(--edge-soft);padding-top:24px;letter-spacing:.06em}
.foot a{color:var(--dim);margin-left:16px}
.foot a:hover{color:var(--a1)}

/* ---------------------------------------------------------- motion */

.reveal{opacity:0;transform:translateY(16px);
  transition:opacity .6s cubic-bezier(.2,.7,.2,1),transform .6s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
  #graph{display:none}
}