/* =========================================================================
   NXDC Website — Design System v1.0
   Derived from the canonical NXDC Brand System v1.0 (NXDC/nxdc-brand).
   Direction: Precision / Graphite + Human Warmth.  Digital Continuity.
   Palette: Graphite #0F1216 · Warm Ivory #F4F1EC · Mineral Teal #2F8A83 ·
            Copper #B8733A · Slate #1C2228 · Silver #8F99A3
   Usage ratio ~ 70-80% graphite/ivory · 15-25% teal · <5% copper.
   ========================================================================= */

:root{
  color-scheme: dark;
  --graphite:#0F1216;
  --graphite-2:#151a20;
  --graphite-3:#1b2129;
  --slate:#1C2228;
  --ivory:#F4F1EC;
  --teal:#2F8A83;
  --teal-bright:#3aa39b;
  --copper:#B8733A;
  --silver:#8F99A3;
  --muted:#a9b0b4;
  --line:#293139;
  --line-soft:#20272f;
  --text:#e9e6df;
  --text-strong:#ffffff;
  --text-soft:#d8d9d5;
  --card-text:#cdceca;
  --principles-text:#b7c1c2;
  --header-bg:rgba(15,18,22,.82);
  --danger:#d76a5e;
  --focus:#3aa39b;
  --max:1220px;
  --radius:6px;
  --font-body:'Inter',ui-sans-serif,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;
}
/* Light theme — same NXDC Brand System, Light mode (Warm Ivory surfaces, Graphite text). */
[data-theme="light"]{
  color-scheme: light;
  --graphite:#FAF8F3;
  --graphite-2:#F3EFE7;
  --graphite-3:#ECE6DB;
  --slate:#EDE8DE;
  --ivory:#0F1216;
  --teal:#1F6F6A;
  --teal-bright:#23736D;
  --copper:#A85F2C;
  --silver:#6B757D;
  --muted:#5A646B;
  --line:#D9D3C6;
  --line-soft:#E4DED2;
  --text:#1C2228;
  --text-strong:#0F1216;
  --text-soft:#3A444C;
  --card-text:#2A333B;
  --principles-text:#37424A;
  --header-bg:rgba(250,248,243,.85);
  --danger:#C05245;
  --focus:#1F6F6A;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
html:focus-within{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--graphite);
  color:var(--text);
  font-family:var(--font-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.no-scroll{overflow:hidden}
img{max-width:100%;height:auto}
a{color:var(--teal-bright);text-underline-offset:3px}
a:hover{color:#fff}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:2px}
::selection{background:var(--teal);color:#fff}

.shell{width:min(var(--max),calc(100% - 48px));margin:0 auto}

/* ---------- Typography ---------- */
h1,h2,h3,h4{color:var(--ivory);font-weight:620;line-height:1.08;letter-spacing:-.02em;margin:0 0 .6em;text-wrap:balance}
h1{font-size:clamp(2.4rem,6vw,4.4rem);line-height:1.02;letter-spacing:-.04em;font-weight:640}
h2{font-size:clamp(1.7rem,3.6vw,2.7rem)}
h3{font-size:1.28rem;line-height:1.25}
p{margin:0 0 1.1em}
.lead{font-size:1.24rem;color:var(--text-soft);max-width:68ch;font-weight:400}
.lead.small{font-size:1.08rem}
.muted{color:var(--muted)}
.small{font-size:.86rem}
strong,b{color:var(--ivory)}
blockquote{margin:0;padding:0 0 0 1.2em;border-left:3px solid var(--teal);font-size:1.2rem;color:var(--ivory);font-style:normal}
.eyebrow{font-size:.78rem;letter-spacing:.24em;color:var(--teal);font-weight:700;text-transform:uppercase;margin:0 0 .9em}
.eyebrow.copper{color:var(--copper)}
.eyebrow.center{text-align:center}

/* ---------- Buttons ---------- */
.button{
  display:inline-block;background:var(--teal);color:#fff !important;text-decoration:none;
  padding:.8rem 1.25rem;border-radius:var(--radius);font-weight:650;font-size:.95rem;
  border:1px solid var(--teal);cursor:pointer;transition:background .15s,border-color .15s,transform .05s;
  line-height:1.2;text-align:center;
}
.button:hover{background:var(--teal-bright);border-color:var(--teal-bright)}
.button:active{transform:translateY(1px)}
.button.ghost{background:transparent;border-color:#4a555d;color:var(--ivory) !important}
.button.ghost:hover{border-color:var(--teal);background:rgba(47,138,131,.08)}
.button.large{font-size:1.05rem;padding:.95rem 1.5rem}
.actions{display:flex;gap:.8rem;flex-wrap:wrap;margin:1.6rem 0 0}

/* ---------- Header / nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:var(--header-bg);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{height:84px;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{display:flex;align-items:center;text-decoration:none;color:var(--ivory)}
.brand img{height:34px;width:auto}
.site-header .brand img{height:44px;width:auto}
@media (max-width:900px){.site-header .brand img{height:32px;width:auto}}
.nav-links{display:flex;gap:1.6rem;align-items:center}
.nav-links a{color:var(--text-soft);text-decoration:none;font-size:.93rem;font-weight:500}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--text-strong)}
.nav-links .button{padding:.5rem .95rem;font-size:.88rem}
.nav-toggle{display:none;background:none;border:1px solid var(--line);color:var(--ivory);border-radius:var(--radius);padding:.5rem .7rem;cursor:pointer}
.nav-toggle svg{display:block}
@media (max-width:900px){
  .nav-toggle{display:block}
  .nav-links{
    display:none;position:absolute;top:84px;left:0;right:0;flex-direction:column;gap:0;
    background:var(--graphite-2);border-bottom:1px solid var(--line);padding:.5rem 6vw 1rem;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:.85rem 0;border-bottom:1px solid var(--line-soft);width:100%}
  .nav-links .button{margin-top:.8rem;border-bottom:none}
}

/* ---------- Hero ---------- */
.hero{padding:clamp(3.5rem,8vw,6.5rem) 0 clamp(2.5rem,6vw,4rem);position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero h1 span{color:var(--teal)}
.hero .flow{position:absolute;width:680px;height:680px;right:-170px;top:40px;border-radius:50%;
  background:repeating-radial-gradient(ellipse at center,transparent 0 15px,rgba(47,138,131,.16) 16px 17px,transparent 18px 30px);
  transform:rotate(-14deg);opacity:.8;pointer-events:none;
  -webkit-mask-image:radial-gradient(closest-side,#000 0%,transparent 78%);mask-image:radial-gradient(closest-side,#000 0%,transparent 78%);
}
.principles{display:flex;gap:2rem;margin-top:2.4rem;color:var(--principles-text);font-size:.8rem;text-transform:uppercase;letter-spacing:.16em}
.principles b{color:var(--teal)}

/* ---------- Sections / cards ---------- */
.section{padding:clamp(3rem,7vw,5.5rem) 0}
.section.tight{padding:clamp(2rem,5vw,3.5rem) 0}
.section-head{margin-bottom:2.4rem}
.section-head p{max-width:70ch}
.cards{display:grid;gap:1.1rem;list-style:none;padding:0;margin:0}
.cards.four{grid-template-columns:repeat(4,1fr)}
.cards.three{grid-template-columns:repeat(3,1fr)}
.cards.two{grid-template-columns:repeat(2,1fr)}
.cards article{background:var(--graphite-2);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;display:flex;flex-direction:column;gap:.4rem}
.cards article .num{font-size:.8rem;color:var(--copper);font-weight:700;letter-spacing:.1em}
.cards article h3{margin:0 0 .3rem}
.cards article p{margin:0 0 .6rem;font-size:.96rem;color:var(--card-text)}
.cards article a{margin-top:auto;font-size:.92rem;font-weight:600;text-decoration:none}
.cards article .tag{font-size:.72rem;letter-spacing:.16em;color:var(--silver);text-transform:uppercase;font-weight:700}
@media (max-width:980px){.cards.four{grid-template-columns:repeat(2,1fr)}.cards.three{grid-template-columns:1fr}}
@media (max-width:600px){.cards.four{grid-template-columns:1fr}.cards.two{grid-template-columns:1fr}}

.statement blockquote{font-size:clamp(1.4rem,3vw,2rem);font-weight:560;letter-spacing:-.01em;max-width:22ch}
.statement .continuity{margin-top:1.4rem;color:var(--muted);font-size:.86rem;letter-spacing:.16em}
.statement .continuity b{color:var(--ivory)}

.split{display:grid;grid-template-columns:1.1fr 1fr;gap:3.5rem;align-items:start}
@media (max-width:820px){.split{grid-template-columns:1fr;gap:2rem}}

/* ---------- Lists / checkmarks ---------- */
.checklist{list-style:none;padding:0;margin:1.2rem 0}
.checklist li{padding:.5rem 0 .5rem 2rem;position:relative;color:var(--text-soft)}
.checklist li::before{content:"";position:absolute;left:0;top:.92rem;width:.6rem;height:.6rem;border-radius:50%;background:var(--teal)}
.checklist li b{color:var(--ivory)}

.answer{background:var(--graphite-2);border:1px solid var(--teal);border-left:4px solid var(--teal);border-radius:var(--radius);padding:1.3rem 1.5rem;margin:1.4rem 0}
.answer p:last-child{margin-bottom:0}

/* ---------- Dark band / callout ---------- */
.darkband{background:var(--graphite-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.tealband{background:linear-gradient(135deg,var(--teal) 0%,#20645f 100%)}
.tealband h2,.tealband p,.tealband .eyebrow{color:#fff}
.tealband .button{background:#fff;color:#0F1216 !important;border-color:#fff;font-weight:700}
.tealband .button.ghost{background:transparent;color:#fff !important;border-color:rgba(255,255,255,.6)}

/* ---------- Contact form ---------- */
.form-grid{display:grid;gap:1rem}
.form-grid .row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media (max-width:600px){.form-grid .row{grid-template-columns:1fr}}
.field label{display:block;font-size:.85rem;color:var(--muted);margin-bottom:.35rem;font-weight:500}
.field input,.field select,.field textarea{
  width:100%;background:var(--graphite-2);border:1px solid var(--line);color:var(--text);
  border-radius:var(--radius);padding:.7rem .8rem;font-size:.98rem;font-family:inherit;line-height:1.3;
}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--teal);outline:none}
.field textarea{min-height:130px;resize:vertical}
.form-note{font-size:.8rem;color:var(--muted)}
.form-msg{margin-top:1rem;padding:.85rem 1rem;border-radius:var(--radius);display:none}
.form-msg.ok{display:block;background:rgba(47,138,131,.16);border:1px solid var(--teal);color:var(--text-strong)}
.form-msg.err{display:block;background:rgba(215,106,94,.14);border:1px solid var(--danger);color:var(--text-strong)}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);margin-top:2rem;background:var(--graphite-2)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1.6fr;gap:2.5rem;padding:3rem 0 2rem}
.footer-grid img{height:40px;width:auto;margin-bottom:1rem}
.footer-grid h4{font-size:.9rem;letter-spacing:.06em;margin:0 0 .9rem;color:var(--ivory)}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin-bottom:.5rem}
.footer-grid a{color:var(--text-soft);text-decoration:none;font-size:.9rem}
.footer-grid a:hover{color:var(--text-strong)}
.footer-base{border-top:1px solid var(--line-soft);padding:1.2rem 0;font-size:.82rem;color:var(--muted);display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.legal-line{color:var(--silver)}
@media (max-width:820px){.footer-grid{grid-template-columns:1fr 1fr}}

/* ---------- Misc ---------- */
.glass{background:var(--graphite-2);border:1px solid var(--line);border-radius:var(--radius);display:flex;flex-direction:column;gap:.5rem;padding:1.5rem}
.cards li{margin:0}
.cards li a{margin-top:auto}
ul,ol{padding-left:1.5rem}
.checklist{margin:1.2rem 0;padding-left:.5rem}
.checklist li b{color:var(--ivory)}
.tagline{color:var(--silver);letter-spacing:.14em;font-size:.8rem;text-transform:uppercase}
.breadcrumbs{font-size:.85rem;color:var(--muted);margin-bottom:1.2rem}
.breadcrumbs a{color:var(--muted);text-decoration:none}
.breadcrumbs a:hover{color:#fff}
.breadcrumbs span{color:var(--ivory)}
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{text-align:left;padding:.65rem .8rem;border-bottom:1px solid var(--line-soft)}
th{color:var(--ivory);font-weight:600}
.step{display:flex;gap:1rem;align-items:flex-start;margin-bottom:1.4rem}
.step .n{flex:0 0 2.4rem;height:2.4rem;border-radius:50%;background:var(--teal);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center}

/* ---------- Language selector + theme toggle ---------- */
/* Theme-aware logo: show the correct canonical variant per theme */
.logo-light{display:none}
[data-theme="light"] .logo-dark{display:none}
[data-theme="light"] .logo-light{display:inline-block}
.toolbar{display:flex;align-items:center;gap:.6rem}
.lang-selector{display:flex;align-items:center;gap:.2rem;border:1px solid var(--line);border-radius:var(--radius);padding:.15rem .2rem;background:transparent}
.lang-selector a{display:inline-block;padding:.22rem .55rem;font-size:.8rem;font-weight:650;color:var(--text-soft);text-decoration:none;border-radius:4px;border:0}
.lang-selector a:hover{color:var(--text-strong)}
.lang-selector a[aria-current="true"]{color:#fff;background:var(--teal)}
.theme-toggle{background:transparent;border:1px solid var(--line);color:var(--text-soft);border-radius:var(--radius);padding:.28rem .6rem;font-size:.82rem;cursor:pointer;display:inline-flex;align-items:center;gap:.35rem;font-family:inherit}
.theme-toggle:hover{color:var(--text-strong);border-color:var(--teal)}
.theme-toggle:focus-visible,.lang-selector a:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
@media (max-width:900px){
  .toolbar{margin-top:.6rem;padding-top:.5rem;border-top:1px solid var(--line-soft)}
  .lang-selector{order:1}
  .theme-toggle{order:2}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto !important}
}