/* ============================================================
   Tevronx — data engineering studio
   Design system / shared stylesheet
   ============================================================ */

:root{
  --ink:        #16202A;
  --paper:      #F7F8F6;
  --surface:    #FFFFFF;
  --cobalt:     #1E47B8;
  --cobalt-deep:#14338C;
  --slate:      #5B6B79;
  --hairline:   #E4E8E5;
  --amber:      #C9791F;

  --display: "Space Grotesk", system-ui, sans-serif;
  --body: "Inter", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --maxw: 1120px;
  --pad: clamp(20px, 5vw, 48px);
  --radius: 4px;
}

*{ box-sizing:border-box; }

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--body);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

a{ color:var(--cobalt); text-decoration:none; }
a:hover{ color:var(--cobalt-deep); }

img{ max-width:100%; display:block; }

h1,h2,h3,h4{
  font-family:var(--display);
  font-weight:600;
  line-height:1.1;
  letter-spacing:-0.01em;
  color:var(--ink);
  margin:0 0 .4em;
}

p{ margin:0 0 1.1em; }

.wrap{ max-width:var(--maxw); margin:0 auto; padding-inline:var(--pad); }

/* ---- monospace eyebrow / label rail ---- */
.eyebrow{
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--slate);
  display:inline-flex;
  align-items:center;
  gap:.6em;
  margin:0 0 1em;
}
.eyebrow::before{
  content:"";
  width:22px; height:1px;
  background:var(--amber);
  display:inline-block;
}

/* ---- header ---- */
header.site{
  position:sticky; top:0; z-index:50;
  background:color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid var(--hairline);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  height:64px;
}
.brand{
  font-family:var(--display);
  font-weight:600;
  font-size:19px;
  letter-spacing:-0.02em;
  color:var(--ink);
  display:flex; align-items:center; gap:9px;
}
.brand .mark{
  width:13px; height:13px;
  border:2px solid var(--cobalt);
  border-radius:2px;
  transform:rotate(45deg);
  position:relative;
}
.brand .mark::after{
  content:""; position:absolute; inset:2px;
  background:var(--amber); border-radius:1px;
}
.nav-links{ display:flex; gap:26px; align-items:center; }
.nav-links a{
  color:var(--slate);
  font-size:15px;
  font-weight:500;
}
.nav-links a:hover, .nav-links a[aria-current="page"]{ color:var(--ink); }
.nav-cta{
  font-family:var(--mono);
  font-size:13px;
  border:1px solid var(--ink);
  color:var(--ink) !important;
  padding:8px 14px;
  border-radius:var(--radius);
}
.nav-cta:hover{ background:var(--ink); color:var(--paper) !important; }
.nav-toggle{ display:none; background:none; border:0; font-size:24px; color:var(--ink); cursor:pointer; }

@media (max-width:760px){
  .nav-links{
    position:absolute; top:64px; left:0; right:0;
    flex-direction:column; align-items:flex-start; gap:0;
    background:var(--surface);
    border-bottom:1px solid var(--hairline);
    padding:8px var(--pad) 16px;
    display:none;
  }
  .nav-links.open{ display:flex; }
  .nav-links a{ padding:11px 0; width:100%; }
  .nav-toggle{ display:block; }
}

/* ---- hero ---- */
.hero{ padding:clamp(56px,9vw,116px) 0 clamp(40px,6vw,72px); }
.hero h1{
  font-size:clamp(34px, 6vw, 60px);
  max-width:14ch;
  margin-bottom:.5em;
}
.hero .lede{
  font-size:clamp(18px,2.4vw,21px);
  color:var(--slate);
  max-width:54ch;
}
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; margin-top:30px; }

.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-weight:500; font-size:15px;
  padding:13px 22px; border-radius:var(--radius);
  border:1px solid transparent; cursor:pointer;
}
.btn-primary{ background:var(--cobalt); color:#fff; }
.btn-primary:hover{ background:var(--cobalt-deep); color:#fff; }
.btn-ghost{ border-color:var(--hairline); color:var(--ink); background:var(--surface); }
.btn-ghost:hover{ border-color:var(--ink); color:var(--ink); }

/* ---- spec rail (signature) ---- */
.specrail{
  border-top:1px solid var(--hairline);
  border-bottom:1px solid var(--hairline);
  display:grid; grid-template-columns:repeat(3,1fr);
  font-family:var(--mono);
}
.specrail div{ padding:22px var(--pad); border-left:1px solid var(--hairline); }
.specrail div:first-child{ border-left:0; }
.specrail .k{ font-size:12px; color:var(--slate); letter-spacing:.06em; text-transform:uppercase; }
.specrail .v{ font-size:clamp(22px,3vw,30px); color:var(--ink); font-weight:500; margin-top:6px; font-family:var(--display); }
@media (max-width:680px){
  .specrail{ grid-template-columns:1fr; }
  .specrail div{ border-left:0; border-top:1px solid var(--hairline); }
  .specrail div:first-child{ border-top:0; }
}

/* ---- generic section ---- */
section{ padding:clamp(48px,7vw,88px) 0; }
section.tight{ padding:clamp(36px,5vw,60px) 0; }
.section-head{ max-width:62ch; margin-bottom:44px; }
.section-head h2{ font-size:clamp(26px,3.6vw,38px); }
.section-head p{ color:var(--slate); font-size:18px; }

/* ---- services grid ---- */
.cards{ display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:1px; background:var(--hairline); border:1px solid var(--hairline); border-radius:var(--radius); overflow:hidden; }
.card{ background:var(--surface); padding:28px; }
.card .idx{ font-family:var(--mono); font-size:12px; color:var(--amber); letter-spacing:.08em; }
.card h3{ font-size:20px; margin:.6em 0 .4em; }
.card p{ color:var(--slate); font-size:15.5px; margin-bottom:0; }

/* ---- approach / list ---- */
.steps{ display:grid; gap:1px; background:var(--hairline); border:1px solid var(--hairline); border-radius:var(--radius); overflow:hidden; }
.step{ background:var(--surface); padding:26px 28px; display:grid; grid-template-columns:64px 1fr; gap:20px; align-items:start; }
.step .n{ font-family:var(--mono); font-size:14px; color:var(--cobalt); padding-top:3px; }
.step h3{ font-size:19px; margin-bottom:.35em; }
.step p{ margin-bottom:0; color:var(--slate); font-size:15.5px; }

/* ---- insights list ---- */
.posts{ display:grid; gap:0; border-top:1px solid var(--hairline); }
.post-row{
  display:grid; grid-template-columns:120px 1fr auto; gap:24px; align-items:baseline;
  padding:24px 4px; border-bottom:1px solid var(--hairline);
}
.post-row .date{ font-family:var(--mono); font-size:13px; color:var(--slate); }
.post-row h3{ font-size:21px; margin:0; }
.post-row .tag{ font-family:var(--mono); font-size:12px; color:var(--amber); text-transform:uppercase; letter-spacing:.06em; }
.post-row p{ grid-column:2; color:var(--slate); font-size:15px; margin:.5em 0 0; }
@media (max-width:640px){
  .post-row{ grid-template-columns:1fr; gap:6px; }
  .post-row p, .post-row .tag{ grid-column:1; }
}

/* ---- article ---- */
.article{ max-width:720px; margin:0 auto; }
.article .meta{ font-family:var(--mono); font-size:13px; color:var(--slate); margin-bottom:18px; }
.article h1{ font-size:clamp(30px,5vw,44px); margin-bottom:.5em; }
.article h2{ font-size:26px; margin-top:1.8em; }
.article h3{ font-size:20px; margin-top:1.5em; }
.article p, .article li{ font-size:18px; color:#243140; }
.article ul, .article ol{ padding-left:1.3em; }
.article li{ margin-bottom:.5em; }
.article code{ font-family:var(--mono); font-size:.88em; background:#eef1ee; padding:2px 6px; border-radius:3px; }
.article pre{ background:var(--ink); color:#E9EEF3; padding:20px; border-radius:var(--radius); overflow-x:auto; font-family:var(--mono); font-size:14px; line-height:1.6; }
.article pre code{ background:none; padding:0; color:inherit; }
.article blockquote{ border-left:3px solid var(--amber); margin:1.4em 0; padding:.2em 0 .2em 20px; color:var(--slate); font-style:italic; }
.article .lede{ font-size:20px; color:var(--slate); }

/* ---- contact ---- */
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:48px; }
@media (max-width:720px){ .contact-grid{ grid-template-columns:1fr; gap:32px; } }
.field{ margin-bottom:18px; }
.field label{ display:block; font-family:var(--mono); font-size:12px; text-transform:uppercase; letter-spacing:.06em; color:var(--slate); margin-bottom:7px; }
.field input, .field textarea{
  width:100%; padding:12px 14px; font-family:var(--body); font-size:15px;
  border:1px solid var(--hairline); border-radius:var(--radius); background:var(--surface); color:var(--ink);
}
.field input:focus, .field textarea:focus{ outline:2px solid var(--cobalt); outline-offset:1px; border-color:var(--cobalt); }
.contact-info dt{ font-family:var(--mono); font-size:12px; text-transform:uppercase; letter-spacing:.06em; color:var(--slate); margin-top:18px; }
.contact-info dd{ margin:4px 0 0; font-size:16px; }

/* ---- CTA band ---- */
.cta-band{ background:var(--ink); color:#EAF0F5; border-radius:var(--radius); padding:clamp(40px,6vw,64px); }
.cta-band h2{ color:#fff; font-size:clamp(24px,3.4vw,34px); max-width:20ch; }
.cta-band p{ color:#A9BAC8; max-width:50ch; }
.cta-band .btn-primary{ background:#fff; color:var(--ink); }
.cta-band .btn-primary:hover{ background:#E9EEF3; color:var(--ink); }

/* ---- footer ---- */
footer.site{ border-top:1px solid var(--hairline); margin-top:24px; padding:48px 0 56px; }
.foot-grid{ display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:32px; }
@media (max-width:720px){ .foot-grid{ grid-template-columns:1fr 1fr; gap:28px; } }
.foot-grid h4{ font-family:var(--mono); font-size:12px; text-transform:uppercase; letter-spacing:.07em; color:var(--slate); font-weight:500; margin-bottom:14px; }
.foot-grid a{ display:block; color:var(--slate); font-size:15px; padding:4px 0; }
.foot-grid a:hover{ color:var(--ink); }
.foot-blurb{ color:var(--slate); font-size:15px; max-width:32ch; }
.foot-bottom{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; margin-top:40px; padding-top:22px; border-top:1px solid var(--hairline); font-size:13.5px; color:var(--slate); font-family:var(--mono); }

/* ---- misc ---- */
.lead-grid{ display:grid; grid-template-columns:1.1fr 1fr; gap:56px; align-items:start; }
@media (max-width:820px){ .lead-grid{ grid-template-columns:1fr; gap:32px; } }
.muted{ color:var(--slate); }
.divider{ height:1px; background:var(--hairline); border:0; margin:0; }
.skip{ position:absolute; left:-9999px; }
.skip:focus{ left:12px; top:10px; background:#fff; padding:10px 14px; border:1px solid var(--ink); border-radius:4px; z-index:100; }
.prose-narrow{ max-width:680px; }
.prose-narrow p, .prose-narrow li{ color:#243140; }