/* ==========================================================================
   ARC INTELLIGENCE — Design System
   Monochrome enterprise: Jet Black / Charcoal / Steel / Silver / White
   ========================================================================== */

:root {
  /* Brand palette (exact values from brand guidelines) */
  --jet: #0A0A0A;
  --charcoal: #1A1A1A;
  --steel: #2E2E2E;
  --silver: #C0C0C0;
  --white: #FFFFFF;

  /* Derived surfaces (base → elevated → floating) */
  --surface-0: #0A0A0A;
  --surface-1: #101010;
  --surface-2: #141414;
  --surface-3: #1A1A1A;

  /* Hairlines & ink */
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --ink-100: #FFFFFF;
  --ink-80: #D9D9D9;
  --ink-60: #A6A6A6;
  --ink-40: #737373;

  /* Type */
  --font: 'Inter', -apple-system, 'Segoe UI', sans-serif;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 6rem;
  --section-pad: clamp(5rem, 12vw, 10rem);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.3s;

  /* Layered, tinted shadows */
  --shadow-card:
    0 1px 2px rgba(0, 0, 0, 0.4),
    0 8px 24px rgba(0, 0, 0, 0.35),
    0 24px 64px rgba(0, 0, 0, 0.3);
  --shadow-float:
    0 2px 4px rgba(0, 0, 0, 0.5),
    0 16px 48px rgba(0, 0, 0, 0.5),
    0 48px 96px rgba(0, 0, 0, 0.45);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--ink-60);
  background: var(--surface-0);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; }
ul, ol { list-style: none; }

::selection { background: var(--silver); color: var(--jet); }

/* Focus visibility — every interactive element */
:focus-visible {
  outline: 2px solid var(--silver);
  outline-offset: 3px;
  border-radius: 2px;
}
:focus:not(:focus-visible) { outline: none; }

/* ---------- Grain overlay ---------- */
.grain {
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Typography ---------- */
h1, h2, h3 { color: var(--ink-100); font-weight: 200; letter-spacing: -0.03em; }

.display-xl {
  font-size: clamp(2.375rem, 5.4vw, 4.25rem);
  line-height: 1.06;
  text-wrap: balance;
}
.display-lg {
  font-size: clamp(1.875rem, 3.8vw, 3rem);
  line-height: 1.12;
  text-wrap: balance;
}
.display-md {
  font-size: clamp(1.375rem, 2.4vw, 1.875rem);
  line-height: 1.25;
  font-weight: 300;
  letter-spacing: -0.02em;
}

.label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.label::before {
  content: "";
  width: 1.5rem;
  height: 1px;
  background: var(--steel);
}
.label--bare::before { display: none; }

/* Premium authority badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.5rem 1.125rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.01));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), var(--shadow-card);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-60);
  white-space: nowrap;
}
.badge i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--silver);
  box-shadow: 0 0 8px rgba(192, 192, 192, 0.6);
  flex-shrink: 0;
}
@media (max-width: 30em) {
  .badge { white-space: normal; text-align: center; letter-spacing: 0.14em; }
}

.lede {
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
  line-height: 1.7;
  color: var(--ink-60);
  font-weight: 300;
}

strong { color: var(--ink-80); font-weight: 500; }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: 75rem;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}
.container--narrow { max-width: 53rem; }

.section { padding-block: var(--section-pad); position: relative; }
.section--line { border-top: 1px solid var(--line); }

.section-head { max-width: 46rem; margin-bottom: clamp(2.5rem, 6vw, 4.5rem); }
.section-head .label { margin-bottom: 1.25rem; }
.section-head p { margin-top: 1.25rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  min-height: 3rem;
  padding: 0.875rem 1.75rem;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: 2px;
  transition: background-color var(--dur) var(--ease-out),
              border-color var(--dur) var(--ease-out),
              color var(--dur) var(--ease-out),
              transform var(--dur) var(--ease-out);
  will-change: transform;
}
.btn:active { transform: scale(0.98); }

.btn--primary {
  background: var(--white);
  color: var(--jet);
}
.btn--primary:hover { background: var(--silver); transform: translateY(-1px); }

.btn--ghost {
  border: 1px solid var(--line-strong);
  color: var(--ink-80);
  background: rgba(255, 255, 255, 0.02);
}
.btn--ghost:hover {
  border-color: rgba(255, 255, 255, 0.4);
  color: var(--ink-100);
  transform: translateY(-1px);
}

.btn--lg { min-height: 3.375rem; padding: 1rem 2.25rem; font-size: 1rem; }

.btn .arrow { transition: transform var(--dur) var(--ease-out); }
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background-color 0.4s var(--ease-out), border-color 0.4s var(--ease-out);
}
.nav.is-scrolled,
.nav.is-open {
  background: rgba(10, 10, 10, 0.82);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom-color: var(--line);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
}
.nav__brand:hover .brand-word { color: var(--ink-100); }
.brand-mark { width: 2.125rem; height: 2.125rem; flex-shrink: 0; }
.brand-word {
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--ink-80);
  transition: color var(--dur) var(--ease-out);
  white-space: nowrap;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}
.nav__link {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--ink-60);
  letter-spacing: 0.02em;
  padding: 0.25rem 0;
  position: relative;
  transition: color var(--dur) var(--ease-out);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px;
  height: 1px;
  background: var(--silver);
  transition: right 0.35s var(--ease-out);
}
.nav__link:hover, .nav__link[aria-current="page"] { color: var(--ink-100); }
.nav__link:hover::after, .nav__link[aria-current="page"]::after { right: 0; }

.nav__cta { min-height: 2.5rem; padding: 0.5rem 1.25rem; font-size: 0.875rem; }

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
}
.nav__toggle span {
  display: block;
  width: 1.25rem;
  height: 1px;
  background: var(--ink-80);
  transition: transform var(--dur) var(--ease-out), opacity var(--dur) var(--ease-out);
}
.nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(3px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { transform: translateY(-3px) rotate(-45deg); }

@media (max-width: 56em) {
  .nav__toggle { display: flex; }
  .nav__links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(10, 10, 10, 0.97);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line);
    padding: 0.75rem 1.5rem 1.5rem;
    display: none;
  }
  .nav.is-open .nav__links { display: flex; }
  .nav__link { padding: 0.875rem 0; font-size: 1rem; border-bottom: 1px solid var(--line); }
  .nav__link::after { display: none; }
  .nav__cta { margin-top: 1.25rem; justify-content: center; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-top: clamp(8.5rem, 18vh, 12rem);
  padding-bottom: clamp(4rem, 9vw, 7rem);
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -3;
  background:
    radial-gradient(56rem 32rem at 78% -10%, rgba(192, 192, 192, 0.07), transparent 62%),
    radial-gradient(44rem 30rem at 8% 22%, rgba(255, 255, 255, 0.035), transparent 60%),
    radial-gradient(70rem 44rem at 50% 118%, rgba(46, 46, 46, 0.5), transparent 65%),
    var(--surface-0);
}
/* Animated light-trail canvas (landing hero) — sits above the static bg, below the veil */
.hero__canvas {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
/* Veil protects the left-aligned headline while letting trails read on the right */
.hero__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(48rem 30rem at 84% 6%, rgba(192, 192, 192, 0.06), transparent 60%),
    linear-gradient(90deg, var(--jet) 0%, rgba(10, 10, 10, 0.72) 30%, rgba(10, 10, 10, 0.12) 60%, transparent 100%),
    linear-gradient(0deg, var(--jet) 0%, rgba(10, 10, 10, 0.35) 14%, transparent 40%);
}
@media (max-width: 56em) {
  /* Strengthen text protection on small screens */
  .hero__veil {
    background:
      linear-gradient(90deg, var(--jet) 0%, rgba(10, 10, 10, 0.6) 55%, rgba(10, 10, 10, 0.25) 100%),
      linear-gradient(0deg, var(--jet) 0%, rgba(10, 10, 10, 0.4) 18%, transparent 46%);
  }
}
.hero__grid-lines {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 30%, transparent 75%);
}

.hero__eyebrow { margin-bottom: 1.75rem; }
.hero__title { max-width: 17ch; }
.hero__sub { max-width: 38rem; margin-top: 1.75rem; }
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.75rem;
}
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.5rem;
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.hero__meta span { display: inline-flex; align-items: center; gap: 0.625rem; }
.hero__meta i {
  width: 4px; height: 4px;
  background: var(--silver);
  border-radius: 50%;
  opacity: 0.7;
}

/* ---------- Pipeline diagram ---------- */
.pipeline-wrap {
  margin-top: clamp(3.5rem, 8vw, 6rem);
  position: relative;
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    radial-gradient(40rem 20rem at 50% 0%, rgba(192, 192, 192, 0.04), transparent 70%),
    var(--surface-1);
  box-shadow: var(--shadow-card);
  padding: clamp(1rem, 3vw, 2.5rem);
}
.pipeline-wrap::before {
  content: "";
  position: absolute;
  top: 0; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(192, 192, 192, 0.45), transparent);
}
.pipeline-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 0.5rem 1rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 0.5rem;
}
.pipeline-head .status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.pipeline-head .status i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--silver);
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.pipeline-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.pipeline-scroll svg { width: 100%; min-width: 41rem; height: auto; }

/* ---------- Cards ---------- */
.grid { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 64em) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 40em) {
  .grid--4, .grid--3, .grid--2 { grid-template-columns: 1fr; }
}

.cell {
  background: var(--surface-1);
  padding: clamp(1.75rem, 3.5vw, 2.5rem);
  position: relative;
  transition: background-color var(--dur) var(--ease-out);
}
.cell:hover { background: var(--surface-2); }
.cell__num {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--ink-40);
  margin-bottom: 2.5rem;
  display: block;
}
.cell h3 { font-size: 1.1875rem; font-weight: 400; letter-spacing: -0.01em; margin-bottom: 0.75rem; }
.cell p { font-size: 0.9375rem; color: var(--ink-60); }
.cell .cell-icon { margin-bottom: 2rem; color: var(--silver); opacity: 0.85; }

/* ---------- Operator cards ---------- */
.operator-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
@media (max-width: 56em) { .operator-grid { grid-template-columns: 1fr; } }

.operator {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    radial-gradient(30rem 16rem at 50% -20%, rgba(192, 192, 192, 0.05), transparent 70%),
    var(--surface-1);
  padding: clamp(2rem, 4vw, 3rem);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease-out), transform 0.4s var(--ease-out);
  box-shadow: var(--shadow-card);
}
.operator:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.operator::before {
  content: "";
  position: absolute;
  top: 0; left: 15%; right: 15%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(192, 192, 192, 0.4), transparent);
}
.operator__tag {
  font-size: 0.6875rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ink-40);
  margin-bottom: 2.5rem;
  display: block;
}
.operator__name {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 200;
  letter-spacing: 0.08em;
  color: var(--ink-100);
  display: flex;
  align-items: center;
  gap: 1rem;
}
.operator__name svg { flex-shrink: 0; }
.operator__role { margin-top: 0.625rem; font-size: 0.875rem; letter-spacing: 0.04em; color: var(--silver); }
.operator__desc { margin-top: 1.5rem; font-size: 0.9844rem; }
.operator__list { margin-top: 1.75rem; display: grid; gap: 0.75rem; }
.operator__list li {
  display: flex;
  gap: 0.875rem;
  align-items: baseline;
  font-size: 0.9375rem;
  color: var(--ink-60);
}
.operator__list li::before {
  content: "";
  width: 0.875rem;
  height: 1px;
  background: var(--silver);
  flex-shrink: 0;
  transform: translateY(-4px);
  opacity: 0.6;
}
.operator__foot {
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.operator__foot a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-80);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color var(--dur) var(--ease-out);
}
.operator__foot a:hover { color: var(--ink-100); }
.operator__foot a:hover .arrow { transform: translateX(3px); }
.operator__foot .arrow { transition: transform var(--dur) var(--ease-out); }

/* ---------- VAT record categories ---------- */
.rec-list { margin-top: 1.25rem; display: grid; gap: 0.5625rem; }
.rec-list li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  font-size: 0.875rem;
  color: var(--ink-60);
  line-height: 1.4;
}
.rec-list li::before {
  content: "";
  width: 0.5rem;
  height: 1px;
  background: var(--silver);
  flex-shrink: 0;
  transform: translateY(-3px);
  opacity: 0.55;
}

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (max-width: 64em) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 40em) { .steps { grid-template-columns: 1fr; } }

/* ---------- Statement / authority ---------- */
.statement {
  text-align: center;
  max-width: 52rem;
  margin-inline: auto;
}
.statement .display-lg { margin-top: 1.5rem; }
.statement p.lede { margin-top: 2rem; }

.divider-quote {
  border-left: 1px solid var(--silver);
  padding-left: clamp(1.5rem, 3vw, 2.5rem);
  max-width: 44rem;
}
.divider-quote p {
  font-size: clamp(1.25rem, 2.2vw, 1.625rem);
  font-weight: 300;
  line-height: 1.5;
  color: var(--ink-80);
  letter-spacing: -0.01em;
}

/* ---------- FAQ ---------- */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.625rem 0.25rem;
  cursor: pointer;
  list-style: none;
  font-size: 1.0625rem;
  font-weight: 400;
  color: var(--ink-80);
  transition: color var(--dur) var(--ease-out);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--ink-100); }
.faq summary .faq-icon {
  flex-shrink: 0;
  position: relative;
  width: 0.875rem;
  height: 0.875rem;
  opacity: 0.6;
}
.faq summary .faq-icon::before,
.faq summary .faq-icon::after {
  content: "";
  position: absolute;
  background: var(--ink-80);
  transition: transform 0.35s var(--ease-out);
}
.faq summary .faq-icon::before { top: 50%; left: 0; width: 100%; height: 1px; }
.faq summary .faq-icon::after { left: 50%; top: 0; height: 100%; width: 1px; }
.faq details[open] summary .faq-icon::after { transform: rotate(90deg) scaleY(0); }
.faq .faq-body { padding: 0 0.25rem 1.75rem; max-width: 46rem; font-size: 0.9844rem; }
.faq .faq-body p + p { margin-top: 0.875rem; }

/* Smooth accordion open/close (progressive enhancement via ::details-content).
   Browsers without support simply toggle instantly — content stays accessible. */
@supports (interpolate-size: allow-keywords) {
  :root { interpolate-size: allow-keywords; }
}
.faq details::details-content {
  block-size: 0;
  overflow: clip;
  opacity: 0;
  transition:
    block-size 0.45s var(--ease-out),
    opacity 0.35s var(--ease-out),
    content-visibility 0.45s allow-discrete;
}
.faq details[open]::details-content {
  block-size: auto;
  opacity: 1;
}
.faq-head {
  max-width: 44rem;
  margin: 0 auto clamp(2.5rem, 6vw, 4rem);
  text-align: center;
}
.faq-head .badge { margin-bottom: 1.5rem; }
.faq-head p { margin-top: 1.25rem; color: var(--ink-60); }

/* ---------- CTA band ---------- */
.cta-band {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    radial-gradient(50rem 26rem at 50% -30%, rgba(192, 192, 192, 0.07), transparent 70%),
    var(--surface-1);
  box-shadow: var(--shadow-float);
  padding: clamp(3rem, 8vw, 6rem) clamp(1.5rem, 5vw, 4rem);
  text-align: center;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  top: 0; left: 20%; right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
}
.cta-band h2 { max-width: 24ch; margin-inline: auto; }
.cta-band p { max-width: 36rem; margin: 1.5rem auto 0; }
.cta-band .btn { margin-top: 2.5rem; }
.cta-band .micro {
  display: block;
  margin-top: 1.25rem;
  font-size: 0.8125rem;
  color: var(--ink-40);
  letter-spacing: 0.04em;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 4rem 0 2.5rem;
  background: var(--surface-0);
}
.footer__top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--line);
}
.footer__brand { max-width: 20rem; }
.footer__brand p { margin-top: 1.25rem; font-size: 0.875rem; color: var(--ink-40); }
.footer__cols { display: flex; gap: clamp(2.5rem, 6vw, 5.5rem); flex-wrap: wrap; }
.footer__col h4 {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-40);
  margin-bottom: 1.25rem;
}
.footer__col a {
  display: block;
  font-size: 0.9063rem;
  color: var(--ink-60);
  padding: 0.3125rem 0;
  transition: color var(--dur) var(--ease-out);
}
.footer__col a:hover { color: var(--ink-100); }
.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 2rem;
  font-size: 0.8125rem;
  color: var(--ink-40);
}

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(1rem, 4vh, 4rem) 1rem;
  overflow-y: auto;
}
.modal.is-open { display: flex; }
.modal__backdrop {
  position: fixed;
  inset: 0;
  background: rgba(5, 5, 5, 0.78);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  opacity: 0;
  transition: opacity 0.35s var(--ease-out);
}
.modal.is-open .modal__backdrop { opacity: 1; }
.modal__panel {
  position: relative;
  width: 100%;
  max-width: 36rem;
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  box-shadow: var(--shadow-float);
  padding: clamp(1.75rem, 4vw, 3rem);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out);
}
.modal.is-open .modal__panel { opacity: 1; transform: translateY(0); }
.modal__close {
  position: absolute;
  top: 1.125rem;
  right: 1.125rem;
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  color: var(--ink-40);
  transition: color var(--dur) var(--ease-out);
}
.modal__close:hover { color: var(--ink-100); }
.modal__panel h3 { font-size: 1.5rem; font-weight: 300; margin: 0.5rem 0 0.5rem; }
.modal__panel > p { font-size: 0.9063rem; margin-bottom: 1.75rem; }

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.125rem; }
@media (max-width: 36em) { .form-grid { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 0.4375rem; }
.field--full { grid-column: 1 / -1; }
.field label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.field input,
.field select,
.field textarea {
  font: inherit;
  font-size: 0.9375rem;
  color: var(--ink-100);
  background: var(--surface-0);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 0.8125rem 1rem;
  min-height: 3rem;
  transition: border-color var(--dur) var(--ease-out), background-color var(--dur) var(--ease-out);
  width: 100%;
}
.field textarea { resize: vertical; min-height: 6.5rem; }
.field input::placeholder, .field textarea::placeholder { color: var(--ink-40); }
.field input:hover, .field select:hover, .field textarea:hover { border-color: rgba(255, 255, 255, 0.28); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--silver);
  background: var(--surface-1);
}
.field select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' fill='none'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23737373' stroke-width='1.2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  cursor: pointer;
}
.form-actions { margin-top: 1.75rem; }
.form-actions .btn { width: 100%; }
.form-note {
  margin-top: 1rem;
  font-size: 0.78125rem;
  color: var(--ink-40);
  text-align: center;
  letter-spacing: 0.02em;
}

/* Confirmation state */
.confirm {
  display: none;
  text-align: center;
  padding: 2rem 0 1rem;
}
.confirm.is-visible { display: block; }
.confirm__icon {
  width: 3.5rem;
  height: 3.5rem;
  margin: 0 auto 1.5rem;
  border: 1px solid var(--silver);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--silver);
}
.confirm h3 { font-size: 1.375rem; font-weight: 300; }
.confirm p { margin-top: 0.875rem; font-size: 0.9063rem; max-width: 26rem; margin-inline: auto; }

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  position: relative;
  padding-top: clamp(8.5rem, 16vh, 11rem);
  padding-bottom: clamp(3.5rem, 7vw, 5.5rem);
  overflow: hidden;
}
.page-hero .hero__bg { z-index: -1; }

/* ---------- Two-column feature ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
}
@media (max-width: 56em) { .split { grid-template-columns: 1fr; } }

.panel-visual {
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    radial-gradient(26rem 14rem at 50% 0%, rgba(192, 192, 192, 0.05), transparent 70%),
    var(--surface-1);
  box-shadow: var(--shadow-card);
  padding: clamp(1.25rem, 3vw, 2rem);
  position: relative;
  overflow: hidden;
}
.panel-visual::before {
  content: "";
  position: absolute;
  top: 0; left: 12%; right: 12%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(192, 192, 192, 0.4), transparent);
}

/* ---------- Checklist ---------- */
.checklist { display: grid; gap: 1rem; margin-top: 2rem; }
.checklist li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  font-size: 0.9844rem;
}
.checklist li svg { flex-shrink: 0; transform: translateY(2px); color: var(--silver); }
.checklist li b { color: var(--ink-80); font-weight: 500; }

/* ---------- Reveal animations (transform/opacity only) ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
  will-change: transform, opacity;
}
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- Utility ---------- */
.center { text-align: center; }
.mt-2 { margin-top: 1rem; }
.mt-4 { margin-top: 2rem; }
.mt-6 { margin-top: 3rem; }
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 300;
  background: var(--white);
  color: var(--jet);
  padding: 0.75rem 1.25rem;
  border-radius: 2px;
  font-size: 0.875rem;
  font-weight: 500;
}
.skip-link:focus { top: 1rem; }