/* =========================================================
   VatFlow — Design System
   Palette · Typography · Layout · Components
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,200;0,9..144,300;0,9..144,400;1,9..144,200;1,9..144,300;1,9..144,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---------------------------------------------------------
   Design tokens
   --------------------------------------------------------- */
:root {
  --ink:    #0a0a0a;
  --paper:  #f4f1ea;
  --line:   #d8d3c7;
  --muted:  #6b6558;
  --accent: #c4332b;
  --white:  #ffffff;

  --font-display: 'Fraunces', Georgia, serif;
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;

  --section-pad: 7rem 3rem;
  --max-w: 1200px;
}

/* ---------------------------------------------------------
   Reset & base
   --------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }

/* ---------------------------------------------------------
   Grain overlay
   --------------------------------------------------------- */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.04;
  pointer-events: none;
  z-index: 9000;
}

/* ---------------------------------------------------------
   Navigation
   --------------------------------------------------------- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: 0 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}
.nav-logo .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background-color: var(--accent);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--ink); }
.nav-right { display: flex; align-items: center; gap: 1.25rem; }
.nav-lang { display: flex; align-items: center; gap: 0.6rem; }
.nav-lang a {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.15s;
}
.nav-lang a:hover, .nav-lang a.active { color: var(--ink); }
.nav-lang .sep { color: var(--line); font-size: 0.7rem; }
.btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: background-color 0.15s, transform 0.15s;
}
.btn-nav:hover { background-color: var(--accent); transform: translateX(2px); }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 22px; height: 1px; background: var(--ink); transition: all 0.2s; }

/* ---------------------------------------------------------
   Shared section layout
   --------------------------------------------------------- */
.section-wrap {
  padding: var(--section-pad);
  border-top: 1px solid var(--line);
}
.inner { max-width: var(--max-w); margin: 0 auto; }
.section-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2.5rem;
  display: block;
}
.section-header {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.75rem, 3vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
  max-width: 34ch;
  margin-bottom: 4rem;
}

/* ---------------------------------------------------------
   Hero
   --------------------------------------------------------- */
#hero {
  padding: 6rem 3rem 5rem;
  max-width: var(--max-w);
  margin: 0 auto;
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.hero-meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 3rem;
}
.hero-meta span { margin: 0 0.6rem; color: var(--line); }
.hero-h1 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.75rem, 7.5vw, 8.5rem);
  line-height: 1.0;
  letter-spacing: -0.03em;
  max-width: 14ch;
  margin-bottom: 2.5rem;
}
.hero-h1 .word {
  display: inline-block;
  opacity: 0;
  transform: translateY(40px);
  animation: word-rise 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  margin-right: 0.2em;
}
@keyframes word-rise {
  to { opacity: 1; transform: translateY(0); }
}
.hero-sub {
  font-size: 1.15rem;
  line-height: 1.6;
  max-width: 48ch;
  color: var(--muted);
  margin-bottom: 3rem;
  opacity: 0;
  animation: fade-up 0.6s 0.85s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-ctas {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fade-up 0.6s 1.05s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--ink);
  color: var(--paper);
  padding: 0.85rem 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background-color 0.15s, transform 0.15s;
}
.btn-primary:hover { background-color: var(--accent); transform: translateX(3px); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color 0.15s, border-color 0.15s;
}
.btn-secondary:hover { color: var(--ink); border-color: var(--ink); }

/* ---------------------------------------------------------
   Marquee
   --------------------------------------------------------- */
.marquee-wrapper {
  background-color: var(--ink);
  overflow: hidden;
  padding: 0.9rem 0;
}
.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee-scroll 32s linear infinite;
}
.marquee-track:hover { animation-play-state: paused; }
@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
.marquee-item {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0 2.25rem;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  white-space: nowrap;
}
.marquee-item strong { color: var(--accent); font-weight: 300; }
.marquee-sep { width: 4px; height: 4px; border-radius: 50%; background-color: var(--accent); flex-shrink: 0; }

/* ---------------------------------------------------------
   01 — Obligation
   --------------------------------------------------------- */
.obligation-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 5rem;
  align-items: start;
}
.obligation-text p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
  margin-bottom: 1.5rem;
}
.obligation-text p strong { color: var(--ink); font-weight: 300; }
.threshold-card {
  border: 1px solid var(--line);
  box-shadow: inset 0 0 0 6px var(--paper), inset 0 0 0 7px var(--line);
  padding: 2.25rem;
  position: sticky;
  top: 84px;
}
.threshold-label {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.25rem;
  display: block;
}
.threshold-amount {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(3rem, 5vw, 4.25rem);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 1rem;
}
.threshold-desc {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  line-height: 1.65;
  border-top: 1px solid var(--line);
  padding-top: 1.1rem;
  margin-top: 1.1rem;
}

/* ---------------------------------------------------------
   02 — Services
   --------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
}
.service-card {
  padding: 2.25rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background-color 0.2s;
}
.service-card:nth-child(even) { border-right: none; }
.service-card:nth-child(3), .service-card:nth-child(4) { border-bottom: none; }
.service-card:hover { background-color: rgba(10,10,10,0.025); }
.service-num { font-family: var(--font-mono); font-size: 0.63rem; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 1.1rem; }
.service-title { font-family: var(--font-display); font-weight: 300; font-size: 1.15rem; letter-spacing: -0.01em; margin-bottom: 0.6rem; }
.service-title em { color: var(--accent); }
.service-desc { font-size: 0.88rem; line-height: 1.65; color: var(--muted); }

/* ---------------------------------------------------------
   03 — Process (6 steps)
   --------------------------------------------------------- */
.process-steps {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border: 1px solid var(--line);
}
.process-step {
  padding: 1.75rem 1.4rem;
  border-right: 1px solid var(--line);
}
.process-step:last-child { border-right: none; }
.step-num {
  width: 34px; height: 34px;
  border: 1px solid var(--line);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 1.25rem;
}
.step-title { font-family: var(--font-display); font-weight: 300; font-size: 0.9rem; letter-spacing: -0.01em; margin-bottom: 0.5rem; }
.step-desc { font-size: 0.78rem; line-height: 1.6; color: var(--muted); }

/* ---------------------------------------------------------
   04 — Pricing
   --------------------------------------------------------- */
.pricing-note {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 3rem;
  max-width: 56ch;
  line-height: 1.65;
}
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
}
.pricing-card {
  padding: 2.75rem;
  border-right: 1px solid var(--line);
}
.pricing-card:last-child { border-right: none; }
.pricing-card.featured { background-color: var(--ink); color: var(--paper); }
.pricing-tag { font-family: var(--font-mono); font-size: 0.63rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-bottom: 1.75rem; display: block; }
.pricing-card.featured .pricing-tag { color: rgba(255,255,255,0.35); }
.pricing-name { font-family: var(--font-display); font-weight: 300; font-size: 1.3rem; letter-spacing: -0.02em; margin-bottom: 0.4rem; }
.pricing-name em { color: var(--accent); }
.pricing-card.featured .pricing-name { color: var(--paper); }
.pricing-amount { font-family: var(--font-display); font-weight: 200; font-size: clamp(2.25rem, 3.5vw, 3.25rem); letter-spacing: -0.04em; line-height: 1; margin: 1.25rem 0 0.4rem; }
.pricing-unit { font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.06em; color: var(--muted); margin-bottom: 1.75rem; }
.pricing-card.featured .pricing-unit { color: rgba(255,255,255,0.35); }
.pricing-divider { height: 1px; background-color: var(--line); margin: 1.75rem 0; }
.pricing-card.featured .pricing-divider { background-color: rgba(255,255,255,0.1); }
.pricing-features { list-style: none; display: flex; flex-direction: column; gap: 0.7rem; }
.pricing-features li { display: flex; align-items: flex-start; gap: 0.7rem; font-size: 0.85rem; line-height: 1.5; color: var(--muted); }
.pricing-card.featured .pricing-features li { color: rgba(255,255,255,0.55); }
.pricing-features li::before { content: '—'; color: var(--line); flex-shrink: 0; font-family: var(--font-mono); font-size: 0.68rem; margin-top: 0.15em; }
.pricing-card.featured .pricing-features li::before { color: var(--accent); }
.pricing-cta { display: inline-flex; align-items: center; gap: 0.4rem; margin-top: 2.25rem; font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); border-bottom: 1px solid var(--line); padding-bottom: 2px; transition: color 0.15s, border-color 0.15s; }
.pricing-cta:hover { color: var(--ink); border-color: var(--ink); }
.pricing-card.featured .pricing-cta { color: rgba(255,255,255,0.5); border-color: rgba(255,255,255,0.15); }
.pricing-card.featured .pricing-cta:hover { color: var(--paper); border-color: rgba(255,255,255,0.5); }

/* ---------------------------------------------------------
   05 — FAQ
   --------------------------------------------------------- */
.faq-list { border-top: 1px solid var(--line); max-width: 760px; }
details.faq-item { border-bottom: 1px solid var(--line); }
details.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 1rem;
  letter-spacing: -0.01em;
  transition: color 0.15s;
  gap: 1rem;
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary:hover { color: var(--accent); }
.faq-icon { font-family: var(--font-mono); font-size: 1rem; color: var(--muted); flex-shrink: 0; transition: transform 0.25s cubic-bezier(0.16,1,0.3,1), color 0.15s; line-height: 1; }
details[open] .faq-icon { transform: rotate(45deg); color: var(--accent); }
.faq-answer { font-size: 0.92rem; line-height: 1.72; color: var(--muted); padding-bottom: 1.4rem; max-width: 60ch; }
.faq-answer strong { color: var(--ink); font-weight: 300; }

/* ---------------------------------------------------------
   Final CTA
   --------------------------------------------------------- */
.cta-final-wrap {
  background-color: var(--ink);
  padding: var(--section-pad);
  text-align: center;
}
.cta-final-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}
.cta-final-heading {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.75rem, 3vw, 2.9rem);
  letter-spacing: -0.03em;
  color: var(--paper);
  line-height: 1.2;
}
.cta-final-heading em { color: var(--accent); }
.btn-light {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--paper);
  color: var(--ink);
  padding: 0.85rem 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background-color 0.15s, color 0.15s, transform 0.15s;
}
.btn-light:hover { background-color: var(--accent); color: var(--paper); transform: translateX(3px); }

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
footer { background-color: var(--ink); color: rgba(255,255,255,0.4); }
.footer-main {
  max-width: var(--max-w); margin: 0 auto;
  padding: 5rem 3rem 4rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 3rem;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-logo { display: flex; align-items: center; gap: 0.5rem; color: var(--paper); font-family: var(--font-display); font-weight: 300; font-size: 1rem; margin-bottom: 1rem; }
.footer-logo .dot { width: 7px; height: 7px; border-radius: 50%; background-color: var(--accent); }
.footer-tagline { font-size: 0.82rem; line-height: 1.65; color: rgba(255,255,255,0.3); max-width: 22ch; }
.footer-col h4 { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(255,255,255,0.22); margin-bottom: 1.1rem; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
.footer-col ul li a { font-size: 0.82rem; color: rgba(255,255,255,0.4); transition: color 0.15s; }
.footer-col ul li a:hover { color: var(--paper); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  max-width: var(--max-w); margin: 0 auto;
  padding: 1.4rem 3rem;
  display: flex; align-items: center; justify-content: space-between;
}
.footer-bottom p { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.08em; color: rgba(255,255,255,0.22); }

/* ---------------------------------------------------------
   Scroll reveal
   --------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.65s cubic-bezier(0.16,1,0.3,1), transform 0.65s cubic-bezier(0.16,1,0.3,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------------------------------------------------------
   Responsive
   --------------------------------------------------------- */
@media (max-width: 1024px) {
  .obligation-grid { grid-template-columns: 1fr; }
  .threshold-card { position: static; }
  .process-steps { grid-template-columns: repeat(3,1fr); }
  .process-step:nth-child(3) { border-right: none; }
  .process-step:nth-child(n+4) { border-top: 1px solid var(--line); }
  .process-step:nth-child(6) { border-right: none; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 2.5rem; }
}

@media (max-width: 768px) {
  :root { --section-pad: 4rem 1.5rem; }
  nav { padding: 0 1.5rem; }
  .nav-links { display: none; position: fixed; inset: 64px 0 0 0; background: var(--paper); flex-direction: column; gap: 0; padding: 1.5rem; border-top: 1px solid var(--line); z-index: 99; }
  .nav-links.open { display: flex; }
  .nav-links li { border-bottom: 1px solid var(--line); }
  .nav-links a { display: block; padding: 0.9rem 0; font-size: 0.8rem; }
  .hamburger { display: flex; }
  .btn-nav { display: none; }
  #hero { padding: 4rem 1.5rem 3.5rem; min-height: 75vh; }
  .services-grid { grid-template-columns: 1fr; }
  .service-card { border-right: none; }
  .service-card:nth-child(3) { border-bottom: 1px solid var(--line); }
  .service-card:nth-child(4) { border-bottom: none; }
  .process-steps { grid-template-columns: 1fr 1fr; }
  .process-step:nth-child(2) { border-right: none; }
  .process-step:nth-child(3) { border-right: 1px solid var(--line); border-top: 1px solid var(--line); }
  .process-step:nth-child(4) { border-right: none; border-top: 1px solid var(--line); }
  .process-step:nth-child(5) { border-right: 1px solid var(--line); border-top: 1px solid var(--line); }
  .process-step:nth-child(6) { border-right: none; border-top: 1px solid var(--line); }
  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card { border-right: none; border-bottom: 1px solid var(--line); }
  .pricing-card:last-child { border-bottom: none; }
  .footer-main { grid-template-columns: 1fr; gap: 2rem; padding: 3.5rem 1.5rem; }
  .footer-bottom { flex-direction: column; gap: 0.5rem; padding: 1.25rem 1.5rem; text-align: center; }
  .hero-ctas { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .process-steps { grid-template-columns: 1fr; }
  .process-step { border-right: none !important; border-top: 1px solid var(--line) !important; }
  .process-step:first-child { border-top: none !important; }
}