/* Lucksrei — shared design system
   Dark-first, technical, premium. Vanilla CSS, no framework. */

:root{
  color-scheme: dark;

  --bg: #06080d;
  --bg-soft: #0a0d14;
  --panel: #0e131c;
  --panel-2: #121826;
  --panel-hover: #151c2c;
  --border: #1d2532;
  --border-strong: #2a3446;

  --text: #eef1f7;
  --text-dim: #a7b1c4;
  --text-faint: #6d778c;

  --accent: #6ea8fe;
  --accent-strong: #8fbcff;
  --accent-2: #58d3a5;
  --accent-warn: #f2b56b;

  --glow: rgba(110,168,254,.16);
  --glow-soft: rgba(110,168,254,.08);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;

  --container: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Consolas, monospace;

  --ease: cubic-bezier(.16,.8,.24,1);
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}

body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.5;
}

img{ max-width: 100%; display: block; }
a{ color: inherit; }
h1,h2,h3,h4{ font-weight: 650; letter-spacing: -.02em; margin: 0; }
p{ margin: 0; }
ul{ margin: 0; padding: 0; list-style: none; }
button{ font: inherit; color: inherit; }

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

::selection{ background: var(--glow); color: var(--text); }

a:focus-visible, button:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link{
  position: absolute; left: 16px; top: -60px;
  background: var(--panel); color: var(--text);
  padding: 10px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  z-index: 200; transition: top .2s var(--ease);
}
.skip-link:focus{ top: 16px; }

/* ---------- header / nav ---------- */
.site-header{
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid transparent;
  background: rgba(6,8,13,.5);
  backdrop-filter: blur(0px);
  transition: background .3s var(--ease), border-color .3s var(--ease), backdrop-filter .3s var(--ease);
}
.site-header.is-scrolled{
  background: rgba(6,8,13,.72);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--border);
}
.nav{
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; padding: 18px 0;
}
.nav-brand{
  display: flex; align-items: baseline; gap: 8px;
  font-weight: 700; font-size: 18px; letter-spacing: -.01em;
  text-decoration: none;
}
.nav-brand small{
  font-weight: 500; font-size: 12px; color: var(--text-faint);
  font-family: var(--font-mono);
}
.nav-links{
  display: flex; align-items: center; gap: 28px;
}
.nav-links a{
  color: var(--text-dim); text-decoration: none; font-size: 14.5px;
  padding: 6px 2px; position: relative;
}
.nav-links a::after{
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 1px; background: var(--accent); transform: scaleX(0);
  transform-origin: left; transition: transform .25s var(--ease);
}
.nav-links a:hover{ color: var(--text); }
.nav-links a:hover::after, .nav-links a[aria-current="true"]::after{ transform: scaleX(1); }
.nav-links a[aria-current="true"]{ color: var(--text); }

.nav-actions{ display: flex; align-items: center; gap: 12px; }

.mobile-toggle{
  display: none; background: none; border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); width: 40px; height: 40px;
  align-items: center; justify-content: center; cursor: pointer;
}
.mobile-toggle svg{ width: 18px; height: 18px; }

.mobile-nav{
  display: none; flex-direction: column; gap: 2px;
  border-top: 1px solid var(--border); background: var(--bg-soft);
}
.mobile-nav.is-open{ display: flex; }
.mobile-nav a{
  display: block; padding: 14px 24px; color: var(--text-dim);
  text-decoration: none; border-bottom: 1px solid var(--border);
  font-size: 15px;
}
.mobile-nav a:hover{ color: var(--text); background: var(--panel); }

@media (max-width: 860px){
  .nav-links{ display: none; }
  .mobile-toggle{ display: inline-flex; }
}

/* ---------- buttons ---------- */
.btn{
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: var(--radius-sm);
  font-size: 14.5px; font-weight: 600; text-decoration: none;
  border: 1px solid var(--border-strong);
  transition: transform .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.btn:hover{ transform: translateY(-1px); }
.btn-primary{
  background: var(--text); color: var(--bg); border-color: var(--text);
}
.btn-primary:hover{ background: var(--accent-strong); border-color: var(--accent-strong); color: #06090f; }
.btn-ghost{
  background: rgba(255,255,255,.02); color: var(--text);
}
.btn-ghost:hover{ border-color: var(--text-dim); background: rgba(255,255,255,.05); }
.btn-sm{ padding: 9px 14px; font-size: 13.5px; }

/* ---------- badges / eyebrows ---------- */
.badge{
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 13px; border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(255,255,255,.02);
  font-size: 13px; color: var(--text-dim);
  font-family: var(--font-mono);
}
.badge .dot{
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2);
}
.eyebrow{
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .06em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 14px;
  display: block;
}

/* ---------- hero ---------- */
.hero{
  padding: 88px 0 60px; position: relative; overflow: clip;
}
.hero-grid{
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center;
}
.hero-copy h1{
  font-size: clamp(36px, 5.4vw, 64px); line-height: 1.06; margin: 18px 0 22px;
  max-width: 620px;
}
.hero-copy .lead{
  font-size: 18px; line-height: 1.65; color: var(--text-dim); max-width: 520px; margin-bottom: 32px;
}
.hero-ctas{ display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }
.hero-meta{
  display: flex; flex-wrap: wrap; gap: 10px 22px; color: var(--text-faint);
  font-size: 13.5px; font-family: var(--font-mono);
}
.hero-meta span{ display: inline-flex; align-items: center; gap: 8px; }
.hero-meta span::before{ content: "›"; color: var(--accent); }

.hero-visual{
  position: relative; border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: radial-gradient(600px 300px at var(--mx,50%) var(--my,20%), var(--glow), transparent 60%), var(--panel);
  padding: 26px; min-height: 340px;
}
.pipeline{ display: flex; flex-direction: column; gap: 10px; }
.pipeline-row{
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--panel-2);
  font-family: var(--font-mono); font-size: 13px; color: var(--text-dim);
  opacity: 0; transform: translateY(8px);
}
.pipeline-row.is-visible{ opacity: 1; transform: translateY(0); transition: opacity .5s var(--ease), transform .5s var(--ease); }
.pipeline-row .step-index{ color: var(--accent); font-weight: 700; }
.pipeline-row .step-name{ color: var(--text); font-weight: 600; }
.pipeline-arrow{ color: var(--text-faint); text-align: center; font-size: 12px; }

@media (max-width: 980px){
  .hero-grid{ grid-template-columns: 1fr; }
  .hero-visual{ order: -1; }
}

/* ---------- metrics strip ---------- */
.metrics{
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  padding: 34px 0;
}
.metrics-grid{
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.metric{ text-align: left; }
.metric .value{
  font-size: clamp(26px, 3.4vw, 36px); font-weight: 700; letter-spacing: -.02em;
  font-family: var(--font-mono); color: var(--text);
}
.metric .label{ color: var(--text-faint); font-size: 13px; margin-top: 4px; }
@media (max-width: 760px){ .metrics-grid{ grid-template-columns: repeat(2, 1fr); } }

/* ---------- generic section ---------- */
section{ padding: 88px 0; }
.section-head{ max-width: 620px; margin-bottom: 48px; }
.section-head h2{ font-size: clamp(26px, 3.6vw, 38px); margin-bottom: 14px; }
.section-head p{ color: var(--text-dim); font-size: 16px; line-height: 1.65; }
.section-foot{ margin-top: 40px; }

[data-reveal]{ opacity: 0; transform: translateY(16px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
[data-reveal].is-visible{ opacity: 1; transform: translateY(0); }

/* ---------- about ---------- */
.about-grid{
  display: grid; grid-template-columns: 1.3fr .7fr; gap: 40px; align-items: start;
}
.about-body p{ color: var(--text-dim); font-size: 16.5px; line-height: 1.75; margin-bottom: 16px; }
.about-body p:last-child{ margin-bottom: 0; }
.fact-card{
  border: 1px solid var(--border); background: var(--panel);
  border-radius: var(--radius); padding: 24px;
}
.fact-card dl{ display: grid; gap: 16px; }
.fact-card div{ display: flex; flex-direction: column; gap: 3px; }
.fact-card dt{ font-size: 12.5px; color: var(--text-faint); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: .04em; }
.fact-card dd{ margin: 0; color: var(--text); font-size: 15px; }
@media (max-width: 860px){ .about-grid{ grid-template-columns: 1fr; } }

/* ---------- project cards (bento) ---------- */
.projects-grid{
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px;
}
.project-card{
  position: relative; grid-column: span 1;
  border: 1px solid var(--border); background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border-radius: var(--radius-lg); padding: 28px;
  text-decoration: none; color: var(--text);
  display: flex; flex-direction: column; gap: 16px; min-height: 240px;
  transition: border-color .25s var(--ease), transform .25s var(--ease), box-shadow .25s var(--ease);
}
.project-card:hover{
  border-color: var(--border-strong); transform: translateY(-3px);
  box-shadow: 0 20px 50px -30px rgba(110,168,254,.35);
}
.project-card.is-featured{ grid-column: span 2; }
.project-card-top{ display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.project-tag{
  font-family: var(--font-mono); font-size: 11.5px; color: var(--accent-2);
  border: 1px solid var(--border-strong); border-radius: 999px; padding: 4px 10px;
}
.project-card h3{ font-size: 22px; }
.project-card p{ color: var(--text-dim); font-size: 14.5px; line-height: 1.6; }
.project-card .chips{ display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.chip{
  font-family: var(--font-mono); font-size: 12px; color: var(--text-faint);
  border: 1px solid var(--border); border-radius: 6px; padding: 4px 8px;
}
.project-card .go{
  display: inline-flex; align-items: center; gap: 6px; font-size: 13.5px;
  color: var(--accent); font-weight: 600;
}
.project-card:hover .go{ text-decoration: underline; }
@media (max-width: 860px){
  .projects-grid{ grid-template-columns: 1fr; }
  .project-card.is-featured{ grid-column: span 1; }
}

/* ---------- process ---------- */
.process-grid{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.process-step{
  border: 1px solid var(--border); border-radius: var(--radius); padding: 22px;
  background: var(--panel);
}
.process-step .num{
  font-family: var(--font-mono); color: var(--accent); font-size: 13px; margin-bottom: 10px; display: block;
}
.process-step h3{ font-size: 17px; margin-bottom: 8px; }
.process-step p{ color: var(--text-dim); font-size: 14px; line-height: 1.6; }
@media (max-width: 860px){ .process-grid{ grid-template-columns: 1fr; } }
@media (min-width: 861px) and (max-width: 1080px){ .process-grid{ grid-template-columns: repeat(2,1fr); } }

/* ---------- stack ---------- */
.stack-grid{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.stack-category{
  border: 1px solid var(--border); border-radius: var(--radius); padding: 22px;
  background: var(--panel);
}
.stack-category h3{
  font-size: 14px; text-transform: uppercase; letter-spacing: .04em;
  color: var(--text-faint); margin-bottom: 14px; font-family: var(--font-mono);
}
.stack-category ul{ display: flex; flex-wrap: wrap; gap: 8px; }
.stack-category li{
  font-size: 13.5px; color: var(--text-dim); border: 1px solid var(--border);
  border-radius: 7px; padding: 6px 10px;
}
@media (max-width: 860px){ .stack-grid{ grid-template-columns: 1fr; } }
@media (min-width: 861px) and (max-width: 1100px){ .stack-grid{ grid-template-columns: repeat(2,1fr); } }

/* ---------- timeline ---------- */
.timeline{ position: relative; padding-left: 28px; }
.timeline::before{
  content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px; width: 1px;
  background: linear-gradient(var(--border-strong), var(--border));
}
.timeline-item{ position: relative; padding-bottom: 36px; }
.timeline-item:last-child{ padding-bottom: 0; }
.timeline-item::before{
  content: ""; position: absolute; left: -28px; top: 4px; width: 11px; height: 11px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--accent);
}
.timeline-item.is-current::before{ box-shadow: 0 0 0 4px var(--glow-soft); }
.timeline-head{
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 14px; margin-bottom: 6px;
}
.timeline-head h3{ font-size: 18px; }
.timeline-role{ color: var(--accent-2); font-size: 13.5px; font-weight: 600; }
.timeline-period{
  font-family: var(--font-mono); font-size: 12.5px; color: var(--text-faint); margin-left: auto;
}
.timeline-item ul{ margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px; }
.timeline-item li{
  font-size: 12.5px; color: var(--text-dim); border: 1px solid var(--border);
  border-radius: 6px; padding: 4px 9px;
}

/* ---------- legacy projects ---------- */
.legacy-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.legacy-item{
  border: 1px solid var(--border); border-radius: var(--radius); padding: 18px;
  background: var(--panel);
}
.legacy-item h4{ font-size: 15px; margin-bottom: 6px; }
.legacy-item p{ color: var(--text-dim); font-size: 13px; line-height: 1.55; margin-bottom: 10px; }
.legacy-item .chips{ display: flex; flex-wrap: wrap; gap: 6px; }
@media (max-width: 900px){ .legacy-grid{ grid-template-columns: repeat(2,1fr); } }
@media (max-width: 560px){ .legacy-grid{ grid-template-columns: 1fr; } }

/* ---------- cta band ---------- */
.cta-band{
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 48px; text-align: center;
  background: radial-gradient(500px 240px at 50% 0%, var(--glow-soft), transparent 70%), var(--panel);
}
.cta-band h2{ font-size: clamp(24px, 3.2vw, 32px); margin-bottom: 14px; }
.cta-band p{ color: var(--text-dim); margin-bottom: 26px; }
.cta-band .hero-ctas{ justify-content: center; margin: 0; }

/* ---------- footer ---------- */
.site-footer{ border-top: 1px solid var(--border); padding: 48px 0 36px; }
.footer-grid{
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; margin-bottom: 32px;
}
.footer-brand{ font-weight: 700; font-size: 18px; margin-bottom: 10px; }
.footer-grid p{ color: var(--text-faint); font-size: 13.5px; line-height: 1.6; max-width: 320px; }
.footer-col h4{ font-size: 13px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 14px; font-family: var(--font-mono); }
.footer-col ul{ display: flex; flex-direction: column; gap: 10px; }
.footer-col a{ color: var(--text-dim); text-decoration: none; font-size: 14px; }
.footer-col a:hover{ color: var(--text); }
.footer-bottom{
  border-top: 1px solid var(--border); padding-top: 22px;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  color: var(--text-faint); font-size: 13px;
}
@media (max-width: 760px){ .footer-grid{ grid-template-columns: 1fr; } }

/* ---------- back to top ---------- */
.back-to-top{
  position: fixed; right: 20px; bottom: 20px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid var(--border-strong); background: var(--panel);
  color: var(--text); display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s;
  cursor: pointer;
}
.back-to-top.is-visible{ opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover{ border-color: var(--accent); color: var(--accent); }

/* ---------- page hero (project / legal pages) ---------- */
.page-hero{ padding: 64px 0 40px; border-bottom: 1px solid var(--border); }
.page-hero h1{ font-size: clamp(30px, 4.6vw, 48px); margin: 16px 0 18px; max-width: 760px; }
.page-hero .lead{ color: var(--text-dim); font-size: 17px; max-width: 640px; line-height: 1.65; }
.page-meta{ display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }

.breadcrumb{ font-family: var(--font-mono); font-size: 13px; color: var(--text-faint); margin-bottom: 18px; }
.breadcrumb a{ color: var(--text-dim); text-decoration: none; }
.breadcrumb a:hover{ color: var(--text); }

/* ---------- case study specifics ---------- */
.case-block{ margin-bottom: 64px; }
.case-block:last-child{ margin-bottom: 0; }
.case-block h2{ font-size: 24px; margin-bottom: 14px; }
.case-block p{ color: var(--text-dim); line-height: 1.75; font-size: 16px; margin-bottom: 14px; max-width: 760px; }
.case-block p:last-child{ margin-bottom: 0; }

.feature-grid{ display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; margin-top: 20px; }
.feature-item{
  border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 18px;
  background: var(--panel); font-size: 14.5px; color: var(--text-dim);
}
.feature-item strong{ color: var(--text); display: block; margin-bottom: 4px; font-size: 15px; }
@media (max-width: 700px){ .feature-grid{ grid-template-columns: 1fr; } }

.flow-row{
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 26px 0;
}
.flow-node{
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 12px 16px; background: var(--panel-2); font-family: var(--font-mono);
  font-size: 13.5px; color: var(--text);
}
.flow-arrow{ color: var(--accent); font-size: 16px; }

.arch-diagram{
  border: 1px solid var(--border); border-radius: var(--radius); padding: 24px;
  background: var(--panel); margin: 24px 0;
}
.arch-core{
  border: 1px dashed var(--border-strong); border-radius: var(--radius-sm);
  padding: 14px; text-align: center; font-family: var(--font-mono); font-size: 13.5px;
  color: var(--text-dim); margin-bottom: 16px;
}
.arch-flavors{ display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; }
.arch-flavor{
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 16px; text-align: center; background: var(--panel-2);
}
.arch-flavor strong{ display: block; margin-bottom: 4px; }
.arch-flavor span{ color: var(--text-faint); font-size: 12.5px; font-family: var(--font-mono); }
@media (max-width: 560px){ .arch-flavors{ grid-template-columns: 1fr; } }

.placeholder-shot{
  border: 1px dashed var(--border-strong); border-radius: var(--radius);
  background: repeating-linear-gradient(135deg, var(--panel) 0 14px, var(--panel-2) 14px 28px);
  min-height: 220px; display: flex; align-items: center; justify-content: center;
  color: var(--text-faint); font-family: var(--font-mono); font-size: 13px; text-align: center;
  padding: 20px;
}

.disclosure{
  border-left: 2px solid var(--border-strong); padding: 4px 0 4px 16px;
  color: var(--text-faint); font-size: 13.5px; margin-top: 22px; max-width: 640px;
}

.case-footer-nav{
  display: flex; justify-content: space-between; align-items: center;
  border-top: 1px solid var(--border); padding-top: 28px; margin-top: 20px; gap: 16px; flex-wrap: wrap;
}

/* ---------- legal page ---------- */
.legal-body h2{ font-size: 19px; margin: 40px 0 12px; }
.legal-body h2:first-child{ margin-top: 0; }
.legal-body p, .legal-body li{ color: var(--text-dim); font-size: 15.5px; line-height: 1.75; margin-bottom: 10px; }
.legal-body ul{ padding-left: 20px; list-style: disc; }