/* =========================================================
   TETRACTYS — Design tokens
   ========================================================= */
:root{
  --ink:        #0D0B1A;
  --ink-soft:   #171331;
  --ink-line:   #2C2652;
  --purple:     #5F49ED;
  --purple-dk:  #4636B8;
  --purple-lt:  #8C7CFF;
  --purple-pale:#EDE9FF;
  --paper:      #FBFAFF;
  --paper-alt:  #F2EEFC;
  --line:       #E2DCF6;
  --text:       #15112B;
  --text-soft:  #514B72;
  --text-faint: #8981AA;
  --inverse:    #F4F2FC;
  --inverse-soft:#B8B0DE;

  --display: "Fraunces", ui-serif, Georgia, serif;
  --body: "Inter", ui-sans-serif, system-ui, sans-serif;
  --mono: "Space Mono", ui-monospace, monospace;

  --container: 1180px;
  --radius: 18px;
  --radius-sm: 10px;
  --ease: cubic-bezier(.22,.68,.18,1);
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

body{
  margin:0;
  font-family:var(--body);
  background:var(--paper);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; margin:0; padding:0; }
button{ font-family:inherit; cursor:pointer; }

.wrap{
  max-width:var(--container);
  margin:0 auto;
  padding:0 32px;
}

.lg-only{ display:inline; }
@media (max-width:640px){ .lg-only{ display:none; } }

/* faint grain overlay for texture, disciplined use */
.grain{
  position:fixed; inset:0; pointer-events:none; z-index:9999;
  opacity:.025; mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* =========================================================
   Type
   ========================================================= */
.eyebrow{
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--purple);
  margin:0 0 16px;
}
.eyebrow-inverse{ color:var(--purple-lt); }

.section-title{
  font-family:var(--display);
  font-weight:500;
  font-size:clamp(1.9rem,3.6vw,2.9rem);
  line-height:1.15;
  letter-spacing:-.01em;
  margin:0 0 20px;
  color:var(--text);
}
.title-inverse{ color:var(--inverse); }

em{ font-style:italic; color:var(--purple-lt); font-family:var(--display); }
.about em{ color:var(--purple); font-style:italic; }

/* =========================================================
   Buttons
   ========================================================= */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:8px;
  padding:14px 26px;
  border-radius:999px;
  font-weight:600;
  font-size:.95rem;
  border:1px solid transparent;
  transition:transform .25s var(--ease), background .25s, border-color .25s, color .25s;
  white-space:nowrap;
}
.btn:hover{ transform:translateY(-2px); }
.btn-primary{ background:var(--purple); color:#fff; }
.btn-primary:hover{ background:var(--purple-dk); }
.btn-outline-inverse{ border-color:rgba(244,242,252,.35); color:var(--inverse); }
.btn-outline-inverse:hover{ border-color:var(--inverse); background:rgba(244,242,252,.06); }
.btn-ghost{ color:var(--text); border-color:var(--line); }
.btn-ghost:hover{ border-color:var(--purple); color:var(--purple); }
.btn-small{ padding:9px 16px; font-size:.82rem; }
.btn-full{ width:100%; }

/* =========================================================
   Header
   ========================================================= */
.site-header{
  position:fixed; top:0; left:0; right:0; z-index:1000;
  padding:20px 0;
  transition:background .35s var(--ease), padding .35s var(--ease), border-color .35s;
  border-bottom:1px solid transparent;
}
.site-header.is-scrolled{
  background:rgba(251,250,255,.82);
  backdrop-filter:blur(14px);
  padding:12px 0;
  border-bottom-color:var(--line);
}
.header-row{ display:flex; align-items:center; justify-content:space-between; gap:24px; }

.brand{ display:flex; align-items:center; gap:10px; }
.brand-word{
  font-family:var(--mono); font-weight:700; letter-spacing:.06em;
  font-size:.95rem;
  color:var(--inverse);
  transition:color .35s;
}
.is-scrolled .brand-word{ color:var(--text); }
.brand-mark{ width:26px; height:24px; flex:0 0 auto; }

.nav{ display:flex; gap:36px; }
.nav-link{
  font-size:.9rem; font-weight:500; color:var(--inverse-soft);
  position:relative; padding:4px 0; transition:color .3s;
}
.is-scrolled .nav-link{ color:var(--text-soft); }
.nav-link::after{
  content:""; position:absolute; left:0; right:100%; bottom:-2px; height:1px;
  background:var(--purple); transition:right .3s var(--ease);
}
.nav-link:hover, .nav-link.is-active{ color:var(--purple); }
.nav-link:hover::after, .nav-link.is-active::after{ right:0; }
.is-scrolled .nav-link:hover, .is-scrolled .nav-link.is-active{ color:var(--purple); }

.header-actions{ display:flex; align-items:center; gap:14px; }
.header-actions .btn-ghost{ border-color:rgba(244,242,252,.3); color:var(--inverse); }
.is-scrolled .header-actions .btn-ghost{ border-color:var(--line); color:var(--text); }

.nav-toggle{
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:34px; height:34px; background:none; border:none; padding:0;
}
.nav-toggle span{
  display:block; height:2px; width:100%; background:var(--inverse); border-radius:2px;
  transition:transform .3s, opacity .3s, background .3s;
}
.is-scrolled .nav-toggle span{ background:var(--text); }

/* =========================================================
   Hero
   ========================================================= */
.hero{
  position:relative;
  min-height:100vh;
  display:flex; align-items:center;
  background:
    radial-gradient(70% 60% at 82% 18%, rgba(95,73,237,.35), transparent 60%),
    radial-gradient(50% 50% at 10% 90%, rgba(140,124,255,.18), transparent 60%),
    var(--ink);
  color:var(--inverse);
  padding:140px 0 100px;
  overflow:hidden;
}
.hero-row{
  display:grid;
  grid-template-columns:1.1fr .9fr;
  align-items:center;
  gap:40px;
}
.hero-title{
  font-family:var(--display);
  font-weight:500;
  font-size:clamp(2.4rem,5.2vw,4.2rem);
  line-height:1.08;
  letter-spacing:-.015em;
  margin:0 0 26px;
}
.hero-sub{
  font-size:1.1rem;
  line-height:1.6;
  color:var(--inverse-soft);
  max-width:46ch;
  margin:0 0 36px;
}
.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; margin-bottom:34px; }
.hero-proof{
  display:flex; align-items:center; gap:10px;
  font-size:.88rem; color:var(--inverse-soft);
}
.hero-proof strong{ color:var(--inverse); font-weight:600; }
.proof-dot{
  width:8px; height:8px; border-radius:50%; background:var(--purple-lt);
  box-shadow:0 0 0 4px rgba(140,124,255,.18);
  flex:0 0 auto;
}

.hero-visual{ position:relative; display:flex; align-items:center; justify-content:center; }
.tetractys-big{ width:min(420px,90%); aspect-ratio:1/.94; }

.scroll-cue{
  position:absolute; bottom:34px; left:50%; transform:translateX(-50%);
  width:26px; height:42px; border:1px solid rgba(244,242,252,.35); border-radius:20px;
}
.scroll-cue span{
  position:absolute; top:8px; left:50%; transform:translateX(-50%);
  width:4px; height:8px; border-radius:2px; background:var(--purple-lt);
  animation:cueMove 1.8s ease-in-out infinite;
}
@keyframes cueMove{
  0%{ opacity:1; transform:translate(-50%,0); }
  70%{ opacity:0; transform:translate(-50%,14px); }
  100%{ opacity:0; transform:translate(-50%,0); }
}

/* =========================================================
   Tetractys SVG dots (shared visual language)
   ========================================================= */
.tetractys-big circle, .tetractys-mid circle, .tetractys-small circle{
  fill:var(--purple-lt);
}
.tetractys-big line, .tetractys-mid line, .tetractys-small line{
  stroke:rgba(140,124,255,.28);
  stroke-width:1;
}
.tetractys-mid circle, .tetractys-small circle{ fill:var(--purple); }
.tetractys-mid line, .tetractys-small line{ stroke:rgba(95,73,237,.22); }

.dot-anim circle{
  animation:dotPulse 3.4s var(--ease) infinite;
  transform-origin:center;
  transform-box:fill-box;
}
@keyframes dotPulse{
  0%,100%{ transform:translateY(0) scale(1); }
  50%{ transform:translateY(-4px) scale(1.06); }
}

.brand-mark svg circle{ fill:var(--purple); }
.is-scrolled .brand-mark svg circle{ fill:var(--purple); }
.hero .brand-mark svg circle,
.site-header:not(.is-scrolled) .brand-mark svg circle{ fill:var(--purple-lt); }

/* =========================================================
   About
   ========================================================= */
.about{ padding:140px 0 120px; background:var(--paper); }
.about-head{ max-width:640px; margin-bottom:56px; }
.about-grid{
  display:grid; grid-template-columns:1.15fr .85fr; gap:64px; align-items:center;
  margin-bottom:100px;
}
.about-text p{ font-size:1.05rem; line-height:1.75; color:var(--text-soft); margin:0 0 20px; }
.about-mission{
  font-family:var(--display); font-style:italic; font-size:1.25rem; line-height:1.5;
  color:var(--text); padding-top:6px; border-top:1px solid var(--line); margin-top:28px !important;
}
.about-figure{ display:flex; justify-content:center; }
.tetractys-mid{ width:min(280px,90%); aspect-ratio:1/.94; }

.rows{
  display:grid; gap:0;
  border-top:1px solid var(--line);
}
.row-item{
  display:grid; grid-template-columns:64px 1fr;
  gap:28px;
  padding:32px 0;
  border-bottom:1px solid var(--line);
  align-items:start;
}
.row-count{
  font-family:var(--display); font-style:italic; font-weight:500;
  font-size:2.2rem; color:var(--purple-lt);
  line-height:1;
}
.row-body h3{
  font-family:var(--body); font-weight:600; font-size:1.05rem; margin:2px 0 8px;
}
.row-body p{ margin:0; color:var(--text-soft); line-height:1.6; max-width:60ch; }

/* =========================================================
   Product
   ========================================================= */
.product{ background:var(--ink); color:var(--inverse); padding:120px 0; position:relative;
  background: radial-gradient(60% 80% at 90% 50%, rgba(95,73,237,.28), transparent 60%), var(--ink);
}
.product-grid{ display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center; }
.product-text{ font-size:1.05rem; line-height:1.7; color:var(--inverse-soft); max-width:52ch; margin:0 0 32px; }

.browser-frame{
  background:var(--ink-soft); border:1px solid var(--ink-line); border-radius:var(--radius);
  overflow:hidden; box-shadow:0 30px 80px -20px rgba(0,0,0,.6);
}
.browser-bar{
  display:flex; align-items:center; gap:8px; padding:14px 16px;
  border-bottom:1px solid var(--ink-line);
}
.browser-dot{ width:9px; height:9px; border-radius:50%; background:var(--ink-line); }
.browser-url{
  margin-left:14px; font-family:var(--mono); font-size:.78rem; color:var(--inverse-soft);
}
.browser-body{
  padding:60px 30px 70px; display:flex; flex-direction:column; align-items:center; gap:18px;
  text-align:center;
}
.tetractys-small{ width:120px; }
.browser-word{ font-family:var(--display); font-size:1.8rem; margin:6px 0 0; color:var(--inverse); }
.browser-tag{ font-family:var(--mono); font-size:.8rem; color:var(--purple-lt); margin:0; letter-spacing:.03em; }

/* =========================================================
   Team
   ========================================================= */
.team{ padding:130px 0; background:var(--paper-alt); }
.team-head{ max-width:640px; margin-bottom:56px; }
.team-intro{ color:var(--text-soft); font-size:1.05rem; margin:0; }
.team-grid{
  display:grid; grid-template-columns:repeat(4,1fr); gap:28px;
}
.team-card{
  background:var(--paper); border:1px solid var(--line); border-radius:var(--radius);
  padding:30px 24px; transition:transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.team-card:hover{ transform:translateY(-6px); box-shadow:0 24px 48px -24px rgba(38,26,110,.25); border-color:var(--purple-lt); }
.team-avatar{
  width:56px; height:52px; margin-bottom:22px;
}
.team-card h3{ font-family:var(--body); font-size:1.05rem; font-weight:600; margin:0 0 4px; }
.team-role{ font-family:var(--mono); font-size:.67rem; color:var(--purple); text-transform:uppercase; letter-spacing:.05em; margin:0 0 14px; }
.team-bio{ color:var(--text-soft); font-size:.92rem; line-height:1.55; margin:0; }
.team-note{ margin-top:36px; font-size:.82rem; color:var(--text-faint); font-style:italic; }

/* =========================================================
   Contact
   ========================================================= */
.contact{ background:var(--ink); color:var(--inverse); padding:130px 0 110px;
  background: radial-gradient(55% 70% at 12% 30%, rgba(95,73,237,.3), transparent 60%), var(--ink);
}
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:70px; }
.contact-text{ color:var(--inverse-soft); font-size:1.05rem; line-height:1.7; max-width:48ch; margin:0 0 40px; }
.contact-list{ display:flex; flex-direction:column; gap:18px; }
.contact-list li{
  display:flex; justify-content:space-between; align-items:baseline;
  padding-bottom:16px; border-bottom:1px solid var(--ink-line);
}
.contact-list span{ font-family:var(--mono); font-size:.75rem; text-transform:uppercase; letter-spacing:.05em; color:var(--inverse-soft); }
.contact-list a{ font-weight:600; transition:color .25s; }
.contact-list a:hover{ color:var(--purple-lt); }

.contact-form{ display:flex; flex-direction:column; gap:18px; }
.contact-form label{
  display:flex; flex-direction:column; gap:8px; font-size:.82rem; color:var(--inverse-soft);
  font-family:var(--mono); text-transform:uppercase; letter-spacing:.04em;
}
.contact-form input, .contact-form textarea{
  font-family:var(--body); font-size:.98rem; color:var(--inverse);
  background:rgba(244,242,252,.05); border:1px solid var(--ink-line); border-radius:var(--radius-sm);
  padding:14px 16px; resize:vertical; transition:border-color .25s, background .25s;
}
.contact-form input::placeholder, .contact-form textarea::placeholder{ color:var(--inverse-soft); opacity:.6; }
.contact-form input:focus, .contact-form textarea:focus{
  outline:none; border-color:var(--purple-lt); background:rgba(244,242,252,.08);
}
.form-note{ font-size:.85rem; color:var(--purple-lt); min-height:1.2em; margin:0; }

/* =========================================================
   Footer
   ========================================================= */
.site-footer{ background:var(--ink); border-top:1px solid var(--ink-line); padding:36px 0; }
.footer-row{ display:flex; align-items:center; justify-content:space-between; gap:24px; flex-wrap:wrap; }
.brand-footer .brand-word{ color:var(--inverse); }
.footer-nav{ display:flex; gap:26px; flex-wrap:wrap; }
.footer-nav a{ font-size:.85rem; color:var(--inverse-soft); transition:color .25s; }
.footer-nav a:hover{ color:var(--purple-lt); }
.footer-copy{ font-size:.8rem; color:var(--inverse-soft); margin:0; font-family:var(--mono); }

.product-logo{
  width: 120px;
  height: auto;
  margin-bottom: 16px;
}

/* =========================================================
   Reveal on scroll
   ========================================================= */
[data-reveal]{
  opacity:0; transform:translateY(24px);
  transition:opacity .8s var(--ease), transform .8s var(--ease);
}
[data-reveal].is-visible{ opacity:1; transform:translateY(0); }

/* =========================================================
   Focus visibility
   ========================================================= */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--purple); outline-offset:3px;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width:980px){
  .hero-row{ grid-template-columns:1fr; text-align:left; }
  .hero-visual{ order:-1; margin-bottom:20px; }
  .tetractys-big{ width:min(280px,70%); }
  .about-grid{ grid-template-columns:1fr; gap:44px; }
  .about-figure{ order:-1; }
  .product-grid{ grid-template-columns:1fr; }
  .product-visual{ order:-1; }
  .contact-grid{ grid-template-columns:1fr; gap:46px; }
  .team-grid{ grid-template-columns:repeat(2,1fr); }
}

@media (max-width:760px){
  .nav{
    position:fixed; top:0; right:0; height:100vh; width:min(78vw,320px);
    background:var(--ink); flex-direction:column; padding:110px 32px 40px; gap:26px;
    transform:translateX(100%); transition:transform .4s var(--ease);
    z-index:999;
  }
  .nav.is-open{ transform:translateX(0); }
  .nav-link{ color:var(--inverse); font-size:1.05rem; }
  .header-actions .btn-small{ display:none; }
  .nav-toggle{ display:flex; }
  .nav-toggle.is-open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
  .nav-toggle.is-open span:nth-child(2){ opacity:0; }
  .nav-toggle.is-open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }
  .row-item{ grid-template-columns:44px 1fr; gap:18px; }
  .row-count{ font-size:1.6rem; }
}

@media (max-width:600px){
  .wrap{ padding:0 20px; }
  .team-grid{ grid-template-columns:1fr; }
  .hero{ padding:120px 0 80px; }
  .about, .team{ padding:90px 0; }
  .product, .contact{ padding:90px 0; }
}