/* =========================================================
   AI ACCOUNTING — Prototype v2
   Image hero · Ken-Burns · Crossfade · Sticky · Parallax
   ========================================================= */

/* ---------- TOKENS ---------- */
:root {
  --c-ink:        #0a1d28;
  --c-ink-deep:   #061018;
  --c-petrol:     #0e2a3a;
  --c-petrol-2:   #1a4660;
  --c-blue:       #2d628c;
  --c-mist:       #cfd9df;
  --c-paper:      #f4f1ea;
  --c-paper-warm: #ece7da;
  --c-rule:       rgba(10, 29, 40, 0.18);
  --c-accent:     #c89a4a;

  --f-display: "Fraunces", "Times New Roman", serif;
  --f-body:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --fs-hero:    clamp(4.5rem, 14vw, 13rem);
  --fs-display: clamp(2rem, 4.5vw, 4rem);
  --fs-h3:      clamp(1.5rem, 2.4vw, 2.25rem);
  --fs-body:    clamp(1rem, 1.05vw, 1.1rem);
  --fs-small:   0.78rem;

  --container:  min(1440px, 92vw);

  --ease:        cubic-bezier(0.65, 0, 0.35, 1);
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --dur-slow:    1.2s;
  --dur-med:     0.6s;
  --dur-fast:    0.3s;
}

/* ---------- RESET ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--f-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.55;
  color: var(--c-ink);
  background: var(--c-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; background: none; border: 0; cursor: pointer; color: inherit; }
::selection { background: var(--c-petrol); color: var(--c-paper); }

.container { width: var(--container); margin-inline: auto; }

/* ---------- HEADER ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 1.25rem 0;
  transition: background var(--dur-med) var(--ease),
              backdrop-filter var(--dur-med) var(--ease),
              padding var(--dur-med) var(--ease),
              border-color var(--dur-med) var(--ease),
              color var(--dur-med) var(--ease);
  border-bottom: 1px solid transparent;
  color: var(--c-paper);
}

.site-header.is-scrolled {
  background: rgba(244, 241, 234, 0.85);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  padding: 0.85rem 0;
  border-bottom-color: var(--c-rule);
  color: var(--c-ink);
}

.header-inner {
  width: var(--container);
  margin-inline: auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 1.1rem;
}
.brand-mark {
  display: inline-block;
  font-size: 0.7em;
  transform: translateY(-0.05em);
  color: var(--c-accent);
}

.primary-nav ul {
  display: flex;
  justify-content: center;
  gap: 2rem;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}
.primary-nav a {
  position: relative;
  padding: 0.4rem 0;
  opacity: 0.85;
  transition: opacity var(--dur-fast) var(--ease);
}
.primary-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--dur-med) var(--ease);
}
.primary-nav a:hover { opacity: 1; }
.primary-nav a:hover::after { transform: scaleX(1); transform-origin: left; }

.header-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.news-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.9;
}
.news-pill .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(200, 154, 74, 0.55); }
  70%  { box-shadow: 0 0 0 8px rgba(200, 154, 74, 0); }
  100% { box-shadow: 0 0 0 0 rgba(200, 154, 74, 0); }
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 28px; height: 22px;
  justify-content: center;
}
.menu-toggle span {
  display: block;
  width: 100%; height: 1.5px;
  background: currentColor;
}

/* ============================================================
   HERO with image slideshow + Ken-Burns + crossfade + parallax
   ============================================================ */

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--c-paper);
  overflow: hidden;
  isolation: isolate;
  /* Fallback dark background while images load */
  background: var(--c-ink-deep);
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  /* JS will set --parallax on this for scroll parallax */
  transform: translate3d(0, var(--parallax, 0px), 0);
  will-change: transform;
}

/* --- Slideshow slides --- */
.hero-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center 35%;
  background-repeat: no-repeat;
  opacity: 0;
  transition: opacity 2.2s var(--ease);
  /* Ken-Burns: slow zoom + drift, runs continuously */
  animation: kenBurnsA 22s var(--ease-out) infinite alternate;
  transform-origin: 60% 40%;
  will-change: transform, opacity;
}

.hero-slide.is-active {
  opacity: 1;
}

/* Different ken-burns trajectory for second slide */
.hero-slide:nth-child(2) {
  animation: kenBurnsB 26s var(--ease-out) infinite alternate;
  transform-origin: 30% 60%;
}

@keyframes kenBurnsA {
  0%   { transform: scale(1.05) translate3d(0, 0, 0); }
  100% { transform: scale(1.18) translate3d(-1.5%, -1%, 0); }
}
@keyframes kenBurnsB {
  0%   { transform: scale(1.18) translate3d(1%, 1%, 0); }
  100% { transform: scale(1.05) translate3d(0, 0, 0); }
}

/* --- Veil: dark gradient for text legibility --- */
.hero-veil {
  position: absolute;
  inset: 0;
  background:
    /* Strong dark wash on left where title sits */
    linear-gradient(95deg,
      rgba(6, 16, 24, 0.78) 0%,
      rgba(6, 16, 24, 0.55) 35%,
      rgba(6, 16, 24, 0.25) 60%,
      rgba(6, 16, 24, 0.45) 100%
    ),
    /* Vertical fade so bottom blends to next section */
    linear-gradient(180deg,
      rgba(6, 16, 24, 0.35) 0%,
      rgba(6, 16, 24, 0.15) 40%,
      rgba(14, 42, 58, 0.55) 80%,
      rgba(14, 42, 58, 0.95) 100%
    );
  pointer-events: none;
}

.hero-noise {
  position: absolute; inset: 0;
  pointer-events: none;
  opacity: 0.07;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

/* --- Hero content --- */
.hero-content {
  position: relative;
  width: var(--container);
  margin-inline: auto;
  padding-block: 12vh 14vh;
  /* Subtle parallax on content opposite to background */
  transform: translate3d(0, var(--content-parallax, 0px), 0);
  will-change: transform;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  font-size: var(--fs-small);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.85;
  margin-bottom: 2.5rem;
  animation: fadeUp var(--dur-slow) var(--ease-out) 0.2s both;
}
.eyebrow-dash {
  width: 36px; height: 1px;
  background: var(--c-accent);
}

.hero-title {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: var(--fs-hero);
  line-height: 0.92;
  letter-spacing: -0.035em;
  margin-bottom: 2.5rem;
  text-shadow:
    0 2px 30px rgba(0,0,0,0.55),
    0 1px 4px rgba(0,0,0,0.35);
}
.hero-title .line { display: block; overflow: hidden; }
.hero-title .line:nth-child(2) {
  font-style: italic;
  font-weight: 400;
  padding-left: clamp(2rem, 8vw, 9rem);
  color: var(--c-mist);
}
.hero-title .word {
  display: inline-block;
  animation: rise 1.4s var(--ease-out) both;
}
.hero-title .line:nth-child(1) .word { animation-delay: 0.4s; }
.hero-title .line:nth-child(2) .word { animation-delay: 0.6s; }

@keyframes rise {
  from { transform: translateY(110%); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}
@keyframes fadeUp {
  from { transform: translateY(20px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.hero-tagline {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(1.2rem, 1.8vw, 1.8rem);
  line-height: 1.25;
  max-width: 36ch;
  color: var(--c-mist);
  margin-bottom: 3.5rem;
  text-shadow:
    0 1px 20px rgba(0,0,0,0.65),
    0 1px 3px rgba(0,0,0,0.4);
  animation: fadeUp var(--dur-slow) var(--ease-out) 0.9s both;
}

.hero-divisions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.4rem;
  align-items: center;
  font-size: 0.95rem;
  animation: fadeUp var(--dur-slow) var(--ease-out) 1.1s both;
}
.division {
  position: relative;
  padding-bottom: 2px;
  transition: color var(--dur-fast) var(--ease);
}
.division::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-med) var(--ease-out);
}
.division:hover { color: var(--c-accent); }
.division:hover::after { transform: scaleX(1); }
.division-sep { opacity: 0.4; }

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 3rem;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  font-size: var(--fs-small);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.75;
  animation: fadeUp var(--dur-slow) var(--ease-out) 1.4s both;
}
.scroll-line {
  width: 1px; height: 60px;
  background: linear-gradient(to bottom, transparent, var(--c-paper) 30%, var(--c-paper) 70%, transparent);
  position: relative;
  overflow: hidden;
}
.scroll-line::after {
  content: "";
  position: absolute; left: 0;
  width: 100%; height: 30%;
  background: var(--c-accent);
  animation: scrollPulse 2.2s var(--ease) infinite;
}
@keyframes scrollPulse {
  0%   { top: -30%; }
  100% { top: 100%; }
}
.scroll-arrow {
  font-size: 1rem;
  letter-spacing: 0;
  animation: bob 2.2s var(--ease) infinite;
}
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(4px); }
}

/* ============================================================
   GENERIC SECTIONS
   ============================================================ */

.intro,
.divisions,
.reach,
.trust {
  padding-block: clamp(6rem, 12vh, 10rem);
}
.intro      { background: var(--c-paper); }
.divisions  { background: var(--c-paper-warm); }
.reach      { background: var(--c-petrol); color: var(--c-paper); }
.trust      { background: var(--c-paper); }

.section-num {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: var(--fs-small);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.65;
  margin-bottom: 2.5rem;
}
.section-num span:first-child {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: 1rem;
  color: var(--c-accent);
}
.num-line {
  width: 60px; height: 1px;
  background: currentColor;
  opacity: 0.4;
}

.display-heading {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: var(--fs-display);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 22ch;
}

/* ---------- INTRO ---------- */
.intro-body {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: end;
}
.intro-body p {
  max-width: 60ch;
  font-size: 1.1rem;
  color: rgba(10, 29, 40, 0.78);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 500;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid currentColor;
  transition: gap var(--dur-med) var(--ease);
}
.text-link:hover { gap: 1.4rem; }
.text-link .arrow { transition: transform var(--dur-med) var(--ease); }
.text-link:hover .arrow { transform: translateX(4px); }

/* ============================================================
   STICKY IMAGE SECTION — image stays, text scrolls over it
   ============================================================ */

.sticky-block {
  position: relative;
  min-height: 220vh;     /* tall enough to scroll the image past */
  background: var(--c-ink-deep);
  color: var(--c-paper);
}

.sticky-image {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100svh;
  width: 100%;
  overflow: hidden;
  z-index: 0;
}

.sticky-image-inner {
  position: absolute;
  inset: -8% 0;          /* extra room for parallax movement */
  background-size: cover;
  background-position: center;
  /* JS sets --sticky-parallax for in-section parallax */
  transform: translate3d(0, var(--sticky-parallax, 0%), 0) scale(1.08);
  will-change: transform;
  /* Subtle continuous breathing zoom */
  animation: stickyBreathe 18s var(--ease-out) infinite alternate;
}

@keyframes stickyBreathe {
  0%   { filter: brightness(0.85) contrast(1.05); }
  100% { filter: brightness(0.95) contrast(1.1); }
}

.sticky-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg,
      rgba(6,16,24,0.55) 0%,
      rgba(6,16,24,0.45) 50%,
      rgba(6,16,24,0.85) 100%),
    linear-gradient(95deg,
      rgba(6,16,24,0.55) 0%,
      rgba(6,16,24,0.25) 60%,
      rgba(14,42,58,0.45) 100%);
}

/* The text sits on top via negative margin + relative z-index */
.sticky-text {
  position: relative;
  z-index: 1;
  margin-top: -100vh;
  margin-top: -100svh;
  padding-block: 50vh 70vh;
}

.sticky-pill {
  font-size: var(--fs-small);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 2rem;
}

.sticky-headline {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(2.5rem, 6vw, 5.5rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  max-width: 18ch;
  margin-bottom: 3rem;
  text-shadow: 0 2px 40px rgba(0,0,0,0.5);
}
.sticky-headline span {
  display: block;
  /* Each line reveals on scroll */
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
}
.sticky-headline.is-visible span {
  opacity: 1;
  transform: translateY(0);
}
.sticky-headline.is-visible span:nth-child(1) { transition-delay: 0.05s; }
.sticky-headline.is-visible span:nth-child(2) { transition-delay: 0.20s; }
.sticky-headline.is-visible span:nth-child(3) { transition-delay: 0.35s; }
.sticky-headline.is-visible span:nth-child(4) { transition-delay: 0.50s; }

.sticky-headline em {
  font-style: italic;
  font-weight: 400;
  color: var(--c-accent);
}

.sticky-body {
  max-width: 48ch;
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--c-mist);
}

/* ============================================================
   DIVISIONS
   ============================================================ */

.divisions-intro {
  max-width: 28ch;
  margin-bottom: 5rem;
}
.divisions-list { display: flex; flex-direction: column; }

.division-card {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 3rem;
  padding-block: 3.5rem;
  border-top: 1px solid var(--c-rule);
  transition: padding-left var(--dur-med) var(--ease);
}
.division-card:last-child { border-bottom: 1px solid var(--c-rule); }
.division-card:hover { padding-left: 1.5rem; }

.card-num {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: 3.5rem;
  line-height: 1;
  color: var(--c-accent);
}

.card-body { max-width: 64ch; }
.card-body h3 {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: var(--fs-h3);
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}
.card-tagline {
  font-family: var(--f-display);
  font-style: italic;
  font-weight: 300;
  font-size: 1.15rem;
  color: var(--c-petrol-2);
  margin-bottom: 1.25rem;
}
.card-desc {
  font-size: 1rem;
  color: rgba(10, 29, 40, 0.72);
  margin-bottom: 1.5rem;
  max-width: 56ch;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--c-petrol-2);
  transition: gap var(--dur-med) var(--ease), color var(--dur-fast) var(--ease);
}
.card-link:hover { gap: 1.1rem; color: var(--c-ink); }

/* ---------- REACH ---------- */
.reach .display-heading { margin-bottom: 4rem; }
.reach-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.25rem 2rem;
  font-family: var(--f-display);
  font-weight: 300;
  font-size: 1.4rem;
}
.reach-list li {
  padding-block: 0.75rem;
  border-top: 1px solid rgba(244, 241, 234, 0.18);
  transition: padding-left var(--dur-med) var(--ease), color var(--dur-fast) var(--ease);
  cursor: default;
}
.reach-list li:hover { padding-left: 0.6rem; color: var(--c-accent); }

/* ---------- TRUST ---------- */
.trust-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 5rem;
  align-items: start;
}
.trust-pillars { display: grid; gap: 2rem; }
.pillar { padding-top: 1.5rem; border-top: 1px solid var(--c-rule); }
.pillar-tag {
  display: inline-block;
  font-size: var(--fs-small);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 0.75rem;
}
.pillar p {
  font-size: 1.05rem;
  color: rgba(10, 29, 40, 0.78);
  max-width: 42ch;
}

/* ---------- FOOTER ---------- */
.site-footer {
  background: var(--c-ink-deep);
  color: var(--c-paper);
  padding-block: 5rem 2rem;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 5rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid rgba(244, 241, 234, 0.12);
}
.footer-brand .brand-mark { color: var(--c-accent); margin-right: 0.5rem; }
.footer-brand .brand-name {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 1.4rem;
}
.footer-pitch {
  margin-top: 1rem;
  opacity: 0.6;
  max-width: 28ch;
  font-size: 0.95rem;
}
.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.footer-nav h4 {
  font-size: var(--fs-small);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--c-accent);
  margin-bottom: 1.25rem;
}
.footer-nav ul { display: grid; gap: 0.6rem; }
.footer-nav a {
  font-size: 0.95rem;
  opacity: 0.75;
  transition: opacity var(--dur-fast) var(--ease);
}
.footer-nav a:hover { opacity: 1; color: var(--c-accent); }

.footer-bottom {
  margin-top: 2rem;
  display: flex;
  justify-content: space-between;
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  opacity: 0.55;
}

/* ---------- REVEAL ON SCROLL ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 960px) {
  .primary-nav { display: none; }
  .menu-toggle { display: flex; }
  .news-pill { display: none; }
  .hero-title .line:nth-child(2) { padding-left: 0; }
  .intro-body { grid-template-columns: 1fr; gap: 2rem; }
  .division-card {
    grid-template-columns: 60px 1fr;
    gap: 1.5rem;
    padding-block: 2.5rem;
  }
  .card-num { font-size: 2.2rem; }
  .division-card:hover { padding-left: 0; }
  .trust-grid { grid-template-columns: 1fr; gap: 3rem; }
  .footer-top { grid-template-columns: 1fr; gap: 3rem; }
  .footer-nav { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom { flex-direction: column; gap: 0.5rem; }
  .sticky-block { min-height: 180vh; }
}
@media (max-width: 540px) {
  .hero-eyebrow { font-size: 0.7rem; }
  .scroll-cue { bottom: 1.5rem; }
  .footer-nav { grid-template-columns: 1fr; }
}

/* ---------- REDUCED MOTION ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .hero-slide { animation: none !important; }
  .sticky-image-inner { animation: none !important; }
  html { scroll-behavior: auto; }
}