/* ============================================================
   NexusFlow AI Technologies LLC — Design System
   Academic / editorial / light. Awwwards-grade craft, restrained.
   ============================================================ */

/* ---- Fonts ---- */
/* Fraunces = editorial serif display (personality), Inter = body,
   IBM Plex Mono = figures/labels. Loaded via <link> in each page. */

:root{
  /* palette (light, paper-toned) */
  --bg:        #FBFAF7;
  --bg-alt:    #F3F1EC;
  --surface:   #FFFFFF;
  --ink:       #17223B;
  --ink-soft:  #4A5568;
  --ink-faint: #8A93A3;
  --accent:    #1B3A6B;
  --accent-2:  #2F6E6A;
  --line:      #E4E0D8;
  --line-soft: #EEEBE3;
  --gold:      #9A7B4F;

  /* type */
  --serif: "Fraunces", "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  /* scale */
  --measure: 68ch;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --section-y: clamp(4.5rem, 9vw, 8.5rem);
  --radius: 5px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{ box-sizing:border-box; }

/* skip link (a11y) */
.skip-link{
  position:absolute; left:1rem; top:-3.5rem; z-index:200;
  background:var(--accent); color:#fff; font-family:var(--sans); font-size:.9rem;
  padding:.6rem 1rem; border-radius:var(--radius);
  transition:top .2s var(--ease);
}
.skip-link:focus{ top:1rem; outline:2px solid var(--ink); outline-offset:2px; }

html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){ html{ scroll-behavior:auto; } }

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:clamp(1rem, .96rem + .2vw, 1.075rem);
  line-height:1.7;
  font-feature-settings:"kern","liga","cv05";
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

/* paper grain overlay — subtle "printed" texture */
body::before{
  content:"";
  position:fixed; inset:0; z-index:9999; pointer-events:none;
  opacity:.028;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- Typography ---- */
h1,h2,h3,h4{ font-family:var(--serif); font-weight:420; line-height:1.06; letter-spacing:-.015em; color:var(--ink); margin:0 0 .5em; }
h1{ font-size:clamp(2.9rem, 2rem + 5.4vw, 6.5rem); font-weight:380; letter-spacing:-.028em; }
h2{ font-size:clamp(2rem, 1.4rem + 2.6vw, 3.5rem); }
h3{ font-size:clamp(1.35rem, 1.1rem + .9vw, 1.85rem); }
h4{ font-size:1.2rem; }
p{ margin:0 0 1.15em; max-width:var(--measure); }
a{ color:var(--accent); text-decoration:none; }
strong{ font-weight:600; color:var(--ink); }
::selection{ background:var(--accent); color:#fff; }

.serif-it{ font-family:var(--serif); font-style:italic; font-weight:380; }

/* eyebrow / small caps label */
.eyebrow{
  font-family:var(--mono); font-size:.72rem; letter-spacing:.16em;
  text-transform:uppercase; color:var(--accent-2); font-weight:500;
  display:inline-flex; align-items:center; gap:.6rem; margin:0 0 1.4rem;
}
.eyebrow::before{ content:""; width:1.6rem; height:1px; background:var(--accent-2); display:inline-block; }

/* section index number (editorial) */
.index-num{ font-family:var(--mono); font-size:.8rem; color:var(--ink-faint); letter-spacing:.1em; }

.lead{ font-size:clamp(1.15rem,1.05rem + .5vw,1.45rem); line-height:1.6; color:var(--ink-soft); max-width:52ch; }

/* pull quote */
.quote{
  font-family:var(--serif); font-style:italic; font-weight:380;
  font-size:clamp(1.4rem,1.1rem + 1.4vw,2.25rem); line-height:1.35;
  color:var(--ink); max-width:24ch; margin:0;
  padding-left:1.4rem; border-left:2px solid var(--gold);
}

/* ---- Layout ---- */
.wrap{ width:100%; max-width:1240px; margin-inline:auto; padding-inline:var(--gutter); }
.section{ padding-block:var(--section-y); }
.section--alt{ background:var(--bg-alt); }
.hairline{ height:1px; background:var(--line); border:0; margin:0; }
.stack > * + *{ margin-top:1.1em; }

.grid{ display:grid; gap:clamp(1.5rem,3vw,3rem); }
.grid-2{ grid-template-columns:repeat(2,1fr); }
.grid-3{ grid-template-columns:repeat(3,1fr); }
@media (max-width:860px){ .grid-2,.grid-3{ grid-template-columns:1fr; } }

/* ledger grid — hairline-divided cells (editorial "table" look) */
.grid--ledger{ gap:1px; background:var(--line); border:1px solid var(--line); border-radius:var(--radius); overflow:hidden; }
.grid--ledger .card{ border:0; border-radius:0; box-shadow:none; }
.grid--ledger .card:hover{ transform:none; box-shadow:none; border-color:transparent; background:var(--bg-alt); }

/* section header with hanging index */
.sec-head{ display:grid; grid-template-columns:auto 1fr; gap:clamp(1.2rem,3vw,3rem); align-items:baseline; margin-bottom:clamp(2.2rem,4vw,3.5rem); }
.sec-head .index-num{ padding-top:.4rem; white-space:nowrap; }
@media (max-width:640px){ .sec-head{ grid-template-columns:1fr; gap:.6rem; } }

/* ---- Buttons ---- */
.btn{
  display:inline-flex; align-items:center; gap:.6rem;
  font-family:var(--sans); font-size:.95rem; font-weight:500; letter-spacing:.005em;
  padding:.85rem 1.5rem; border-radius:var(--radius); cursor:pointer;
  transition:transform .35s var(--ease), background .35s var(--ease), color .35s var(--ease), border-color .35s var(--ease);
}
.btn svg{ transition:transform .35s var(--ease); }
.btn:hover svg{ transform:translateX(4px); }
.btn--primary{ background:var(--accent); color:#fff; border:1px solid var(--accent); }
.btn--primary:hover{ background:#132d54; }
.btn--ghost{ background:transparent; color:var(--ink); border:1px solid var(--line); }
.btn--ghost:hover{ border-color:var(--accent); color:var(--accent); }

/* animated underline link */
.ulink{ position:relative; color:var(--ink); font-weight:500; }
.ulink::after{ content:""; position:absolute; left:0; bottom:-2px; width:100%; height:1px; background:var(--accent); transform:scaleX(0); transform-origin:right; transition:transform .4s var(--ease); }
.ulink:hover{ color:var(--accent); }
.ulink:hover::after{ transform:scaleX(1); transform-origin:left; }
.ulink svg{ vertical-align:-1px; }

/* ---- Header ---- */
.site-header{ position:sticky; top:0; z-index:100; background:color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter:blur(10px); border-bottom:1px solid transparent; transition:border-color .3s, background .3s; }
.site-header.is-scrolled{ border-bottom-color:var(--line); }
.nav{ display:flex; align-items:center; justify-content:space-between; height:74px; }
.brand{ display:inline-flex; align-items:center; gap:.6rem; color:var(--ink); font-family:var(--serif); font-size:1.32rem; font-weight:500; letter-spacing:-.01em; }
.brand svg{ display:block; }
.nav-links{ display:flex; align-items:center; gap:clamp(1.2rem,2.4vw,2.4rem); list-style:none; margin:0; padding:0; }
.nav-links a{ color:var(--ink-soft); font-size:.95rem; font-weight:450; position:relative; }
.nav-links a:hover,.nav-links a[aria-current="page"]{ color:var(--ink); }
.nav-links a[aria-current="page"]::after{ content:""; position:absolute; left:0; bottom:-6px; width:100%; height:1px; background:var(--accent); }
.nav-cta{ display:flex; align-items:center; gap:1rem; }
.nav-toggle{ display:none; background:none; border:0; cursor:pointer; padding:.5rem; }
.nav-toggle span{ display:block; width:22px; height:1.5px; background:var(--ink); margin:5px 0; transition:.3s var(--ease); }
@media (max-width:880px){
  .nav-links, .nav-cta .btn{ display:none; }
  .nav-toggle{ display:block; }
  .nav.is-open .nav-links{ display:flex; position:absolute; top:74px; left:0; right:0; flex-direction:column; align-items:flex-start; gap:1.3rem; background:var(--bg); border-bottom:1px solid var(--line); padding:2rem var(--gutter) 2.5rem; }
  .nav.is-open .nav-toggle span:nth-child(1){ transform:translateY(6.5px) rotate(45deg); }
  .nav.is-open .nav-toggle span:nth-child(2){ opacity:0; }
  .nav.is-open .nav-toggle span:nth-child(3){ transform:translateY(-6.5px) rotate(-45deg); }
}

/* ---- Hero ---- */
.hero{ padding-block:clamp(3.5rem,7vw,7rem) clamp(3rem,6vw,6rem); position:relative; }
.hero h1{ margin-bottom:.35em; font-size:clamp(3.2rem, 2rem + 7vw, 7.5rem); letter-spacing:-.032em; }
.hero .lead{ margin-bottom:2.2rem; }
.hero-cta{ display:flex; flex-wrap:wrap; gap:1rem; align-items:center; }
.hero-fig{ margin-top:clamp(3rem,6vw,5.5rem); }

/* ---- Cards ---- */
.card{ background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:clamp(1.6rem,2.4vw,2.2rem); transition:transform .45s var(--ease), border-color .45s var(--ease), box-shadow .45s var(--ease); }
.card:hover{ transform:translateY(-4px); border-color:#d8d2c6; box-shadow:0 18px 40px -28px rgba(23,34,59,.28); }
.card .num{ font-family:var(--mono); font-size:.78rem; color:var(--ink-faint); letter-spacing:.12em; }
.card h3{ margin:.7rem 0 .5rem; }
.card p{ color:var(--ink-soft); margin-bottom:0; font-size:.98rem; }

/* capability list row */
.rows{ border-top:1px solid var(--line); }
.row{ display:grid; grid-template-columns:auto 1fr; gap:clamp(1.2rem,4vw,4rem); padding:clamp(1.8rem,3vw,2.6rem) 0; border-bottom:1px solid var(--line); align-items:start; }
.row .index-num{ padding-top:.5rem; }
.row h3{ margin-bottom:.4rem; }
.row p{ color:var(--ink-soft); margin-bottom:0; }
@media (max-width:640px){ .row{ grid-template-columns:1fr; gap:.5rem; } }

/* tag pills (facts, not customer logos) */
.tags{ display:flex; flex-wrap:wrap; gap:.6rem 1.4rem; list-style:none; padding:0; margin:0; align-items:center; }
.tags li{ font-family:var(--mono); font-size:.78rem; letter-spacing:.06em; color:var(--ink-soft); display:inline-flex; align-items:center; gap:.55rem; }
.tags li::before{ content:""; width:5px; height:5px; border-radius:50%; background:var(--accent-2); }

/* built-on-AWS panel */
.panel{ background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:clamp(2rem,4vw,3.5rem); }

/* figure / diagram */
figure{ margin:0; }
.fig-cap{ font-family:var(--mono); font-size:.75rem; letter-spacing:.06em; color:var(--ink-faint); margin-top:.9rem; }
.diagram{ width:100%; height:auto; background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); }

/* ---- Contact / form ---- */
.field{ display:flex; flex-direction:column; gap:.45rem; margin-bottom:1.3rem; }
.field label{ font-size:.85rem; font-weight:500; color:var(--ink); letter-spacing:.01em; }
.field input,.field textarea{ font-family:var(--sans); font-size:1rem; color:var(--ink); background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:.8rem .95rem; transition:border-color .3s; }
.field input:focus,.field textarea:focus{ outline:none; border-color:var(--accent); }

/* ---- Footer ---- */
.site-footer{ background:var(--bg-alt); border-top:1px solid var(--line); padding-block:clamp(3rem,5vw,4.5rem) 2rem; }
.foot-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:clamp(1.5rem,4vw,3rem); }
@media (max-width:760px){ .foot-grid{ grid-template-columns:1fr; gap:2rem; } }
.foot-col h5{ font-family:var(--mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.14em; color:var(--ink-faint); margin:0 0 1.1rem; font-weight:500; }
.foot-col ul{ list-style:none; padding:0; margin:0; }
.foot-col li{ margin-bottom:.6rem; }
.foot-col a{ color:var(--ink-soft); font-size:.95rem; }
.foot-col a:hover{ color:var(--accent); }
.foot-brand p{ color:var(--ink-soft); font-size:.95rem; max-width:34ch; margin:.9rem 0 0; }
.foot-bottom{ display:flex; flex-wrap:wrap; justify-content:space-between; gap:1rem; margin-top:3rem; padding-top:1.6rem; border-top:1px solid var(--line); font-size:.85rem; color:var(--ink-faint); }
.foot-bottom .addr{ font-style:normal; }

/* ---- Reveal animation ---- */
.reveal{ opacity:0; transform:translateY(14px); transition:opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.is-in{ opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce){ .reveal{ opacity:1; transform:none; transition:none; } }

/* page hero (interior) */
.page-hero{ padding-block:clamp(3.5rem,6vw,6rem) clamp(2rem,4vw,3.5rem); }
.page-hero h1{ font-size:clamp(2.6rem,1.8rem + 4vw,5rem); }
.crumb{ font-family:var(--mono); font-size:.75rem; letter-spacing:.08em; color:var(--ink-faint); margin-bottom:1.6rem; }
.crumb a{ color:var(--ink-faint); } .crumb a:hover{ color:var(--accent); }

.value-list{ list-style:none; padding:0; margin:0; }
.value-list li{ padding:1.3rem 0; border-bottom:1px solid var(--line); display:grid; grid-template-columns:minmax(140px,1fr) 2.2fr; gap:1.5rem; }
.value-list h4{ font-family:var(--serif); margin:0; }
.value-list p{ margin:0; color:var(--ink-soft); }
@media (max-width:640px){ .value-list li{ grid-template-columns:1fr; gap:.4rem; } }