/* ============================================================
   ARC — Base & Layout
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
img { -webkit-user-drag: none; user-select: none; -webkit-user-select: none; pointer-events: auto; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 8%, rgba(47, 210, 125, .08), transparent 24rem),
    radial-gradient(circle at 88% 26%, rgba(31, 160, 239, .07), transparent 22rem),
    var(--cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    url("../../assets/images/arc-logo-dark.png"),
    url("../../assets/images/arc-logo-dark.png"),
    url("../../assets/images/arc-logo-dark.png");
  background-repeat: no-repeat;
  background-size: clamp(180px, 24vw, 360px), clamp(140px, 18vw, 260px), clamp(220px, 30vw, 430px);
  background-position: -4rem 9rem, calc(100% + 4rem) 33rem, 50% calc(100% - 8rem);
  opacity: .035;
  filter: grayscale(1);
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 { margin: 0; font-weight: 800; letter-spacing: -0.01em; line-height: 1.06; }
p { margin: 0 0 1rem; } p:last-child { margin-bottom: 0; }

/* layout helpers */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--section-y); }
.section--ink { background: linear-gradient(135deg, rgba(22,20,15,.98), rgba(22,20,15,.94)); color: var(--text-invert); position: relative; overflow: hidden; }
.section--ink::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("../../assets/images/arc-logo-white.png") no-repeat right -4rem center / min(42vw, 420px);
  opacity: .045;
  pointer-events: none;
}
.section--ink > .container { position: relative; z-index: 1; }
.section--ink h1, .section--ink h2, .section--ink h3 { color: var(--text-invert); }
.lead { font-size: var(--fs-lead); color: var(--text-muted); }
.section--ink .lead { color: var(--text-invert-muted); }

.center { text-align: center; }
.mx-auto { margin-inline: auto; }
.serif { font-family: var(--font-sans); }

/* eyebrow: small tracked label with a brand dot */
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.55ch;
  font-size: var(--fs-eyebrow); font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 1.25rem;
}
.eyebrow::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: var(--green); flex: 0 0 auto;
}
.section--ink .eyebrow { color: var(--text-invert-muted); }

/* stacked professional display headline */
.display { letter-spacing: -0.018em; }
.display .serif-line {
  display: block; font-family: var(--font-sans); font-weight: 800;
  font-size: clamp(2.2rem, 1.45rem + 3.5vw, 4.35rem); line-height: 1.02;
}
.display .sans-line {
  display: block; font-family: var(--font-sans); font-weight: 900;
  font-size: var(--fs-h1); line-height: 1.02; margin-top: 0.04em;
}

/* section heading block */
.section-head { max-width: 60ch; margin-bottom: clamp(2rem, 4vw, 3.5rem); }
.section-head.center { margin-inline: auto; }
.section-head h2 { font-size: var(--fs-h2); margin-bottom: 1rem; }
.section-head h2 .serif { font-weight: 800; font-style: normal; }

.grid { display: grid; gap: clamp(1rem, 2.5vw, 1.75rem); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }

.welcome-pop {
  position: fixed;
  inset: 0;
  z-index: 240;
  display: grid;
  place-items: end center;
  padding: var(--gutter);
  background: rgba(22,20,15,.18);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .35s var(--ease), visibility .35s var(--ease);
}
.welcome-pop.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.welcome-pop__card {
  position: relative;
  width: min(100%, 430px);
  padding: clamp(1.4rem, 4vw, 2rem);
  border: 1px solid color-mix(in srgb, var(--purple) 22%, var(--line));
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(128,80,240,.1), rgba(31,160,239,.08)),
    rgba(255,255,255,.96);
  box-shadow: 0 28px 70px rgba(15,23,42,.22);
  transform: translateY(28px) scale(.96);
  transition: transform .5s var(--ease);
}
.welcome-pop.is-visible .welcome-pop__card {
  transform: translateY(0) scale(1);
  animation: welcomeFloat 5s ease-in-out infinite alternate;
}
.welcome-pop__card img {
  width: auto;
  height: 48px;
  margin-bottom: 1.1rem;
}
.welcome-pop__card .eyebrow { margin-bottom: .8rem; color: var(--purple); }
.welcome-pop__card h2 {
  max-width: 16ch;
  margin-bottom: .85rem;
  font-size: clamp(1.45rem, 1.05rem + 1.6vw, 2.15rem);
}
.welcome-pop__card p:not(.eyebrow) {
  max-width: 34ch;
  color: var(--text-muted);
}
.welcome-pop__close {
  position: absolute;
  top: .85rem;
  right: .85rem;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #fff;
  color: var(--purple);
  font: inherit;
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
}
@keyframes welcomeFloat {
  from { box-shadow: 0 28px 70px rgba(15,23,42,.22); }
  to { box-shadow: 0 34px 82px rgba(128,80,240,.28); }
}

.skip-link { position: absolute; left: -999px; top: 0; z-index: 200; background: var(--green); color: var(--ink); padding: .75rem 1.25rem; font-weight: 700; border-radius: 0 0 var(--radius-sm) 0; }
.skip-link:focus { left: 0; }
:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; border-radius: 6px; }

/* ---------- HERO ---------- */
.hero { position: relative; padding-top: clamp(9.25rem, 15vw, 12rem); padding-bottom: clamp(3rem, 6vw, 5rem); text-align: center; overflow: hidden; }
.hero::before {
  content: "";
  position: absolute;
  width: clamp(280px, 42vw, 620px);
  aspect-ratio: 1;
  right: max(-12vw, -8rem);
  top: clamp(5rem, 12vw, 9rem);
  background: url("../../assets/images/arc-logo-dark.png") center / contain no-repeat;
  opacity: .045;
  filter: grayscale(1);
  transform: rotate(-10deg);
  pointer-events: none;
  animation: heroLogoDrift 14s ease-in-out infinite alternate;
}
.hero::after {
  content: "";
  position: absolute;
  inset: -20% -10%;
  background:
    radial-gradient(circle at 18% 28%, rgba(47,210,125,.11), transparent 42%),
    radial-gradient(circle at 82% 18%, rgba(20,115,194,.08), transparent 38%),
    radial-gradient(circle at 50% 88%, rgba(90,47,194,.06), transparent 40%);
  pointer-events: none;
  animation: heroGlow 10s ease-in-out infinite alternate;
}
@keyframes heroLogoDrift {
  from { transform: rotate(-10deg) translateY(0); }
  to { transform: rotate(-8deg) translateY(12px); }
}
@keyframes heroGlow {
  from { opacity: .55; transform: scale(1); }
  to { opacity: 1; transform: scale(1.04); }
}
.hero > .container, .hero > .fan { position: relative; z-index: 1; }
.hero__inner { max-width: none; margin-inline: auto; }
.hero__inner .serif-line,
.hero__inner .sans-line {
  display: block;
  white-space: nowrap;
}
.hero__sub { max-width: 46ch; margin: 1.5rem auto 2rem; color: var(--text-muted); font-size: var(--fs-lead); }
.hero__cta { display: flex; justify-content: center; flex-wrap: wrap; gap: 1rem; }

/* the fanned portrait arc — signature element */
.fan { position: relative; margin-top: clamp(2.5rem, 5vw, 4rem); }
.fan__row {
  display: flex; justify-content: center; align-items: flex-end;
  gap: clamp(0.5rem, 1.2vw, 1rem); padding-inline: var(--gutter);
}
.fan__card {
  position: relative; flex: 1 1 0; max-width: 150px; aspect-ratio: 3/4;
  border-radius: 18px; overflow: hidden; box-shadow: var(--shadow-md);
  transform-origin: bottom center; transition: transform var(--dur) var(--ease);
}
/* arc curvature: ends sit lower & rotated, center rises */
.fan__card:nth-child(1) { --fan-y: 34px; --fan-r: -9deg; }
.fan__card:nth-child(2) { --fan-y: 14px; --fan-r: -5deg; }
.fan__card:nth-child(3) { --fan-y: 2px;  --fan-r: -2deg; }
.fan__card:nth-child(4) { --fan-y: 14px; --fan-r: 5deg; }
.fan__card:nth-child(5) { --fan-y: 34px; --fan-r: 9deg; }
.fan__card:nth-child(n) { transform: translateY(var(--fan-y)) rotate(var(--fan-r)); }
.fan__card:hover { transform: translateY(calc(var(--fan-y) - 6px)) rotate(0deg); z-index: 2; }
.fan__card--photo img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .65s var(--ease);
}
.fan__card--photo:hover img { transform: scale(1.06); }
.fan__card--photo::before { display: none; }
.fan__card span {
  position: absolute; inset: auto 0 0 0; padding: 0.6rem; text-align: center;
  font-size: 0.72rem; font-weight: 700; color: rgba(255,255,255,.92);
  background: linear-gradient(transparent, rgba(0,0,0,.35));
}
/* portrait placeholder = brand-color gradient + initial */
.fan__card::before {
  content: attr(data-i); position: absolute; inset: 0; display: grid; place-items: center;
  font-family: var(--font-sans); font-size: 2.4rem; font-weight: 800; color: rgba(255,255,255,.85);
}
.fan--green  { background: linear-gradient(160deg, var(--green),  var(--green-deep)); }
.fan--blue   { background: linear-gradient(160deg, var(--blue),   #1473c2); }
.fan--purple { background: linear-gradient(160deg, var(--purple), #5a2fc2); }
.fan--orange { background: linear-gradient(160deg, var(--orange), #c25400); }
.fan--yellow { background: linear-gradient(160deg, var(--yellow), #d2a410); }

/* three mini-features under the fan */
.hero__features {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  max-width: 880px; margin: clamp(3rem, 6vw, 4.5rem) auto 0;
  border-top: 1px solid var(--line); padding-top: 2.25rem; text-align: left;
}
.mini { padding-inline: clamp(1rem, 2vw, 1.75rem); border-left: 1px solid var(--line); }
.mini:first-child { border-left: 0; padding-left: 0; }
.mini h4 { font-size: 1.02rem; font-weight: 800; margin-bottom: 0.4rem; }
.mini p { font-size: 0.9rem; color: var(--text-muted); }

/* ---------- BENTO feature grid ---------- */
.bento { display: grid; grid-template-columns: 1.4fr 1fr; grid-auto-rows: minmax(220px, auto); gap: clamp(1rem, 2vw, 1.5rem); }
.tile { position: relative; border-radius: var(--radius-lg); overflow: hidden; padding: clamp(1.5rem, 3vw, 2.25rem); display: flex; flex-direction: column; justify-content: flex-end; min-height: 240px; }
.tile h3 { font-size: var(--fs-h3); margin-bottom: 0.5rem; }
.tile p { font-size: 0.95rem; max-width: 36ch; }
[style*="text-align:center"] .tile p,
.tile[style*="text-align:center"] p { margin-left: auto; margin-right: auto; }
.tile[style*="text-align:center"] { align-items: center; }
.tile[style*="text-align:center"] .tile__tag { position: static; opacity: 1; margin-bottom: .5rem; }
.tile--lg { grid-row: span 1; }
.tile--tan { background: var(--cream-2); color: var(--text); border: 1px solid var(--line); }
.tile--tan p { color: var(--text-muted); }
.tile--ink { background: var(--ink); color: var(--text-invert); }
.tile--ink p { color: var(--text-invert-muted); }
.tile--green { background: linear-gradient(150deg, var(--green), var(--green-deep)); color: #fff; }
.tile--green p { color: rgba(255,255,255,.85); }
.tile--blue { background: linear-gradient(150deg, var(--blue), #1473c2); color: #fff; }
.tile--blue p { color: rgba(255,255,255,.85); }
.tile__tag { position: absolute; top: clamp(1.25rem,2.5vw,1.75rem); left: clamp(1.5rem,3vw,2.25rem); font-size: 0.72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; opacity: .8; }
.tile__art { position: absolute; inset: 0; display: grid; place-items: center; font-family: var(--font-sans); font-weight: 800; font-size: clamp(5rem, 14vw, 10rem); color: rgba(255,255,255,.12); pointer-events: none; }

/* ---------- STATS band ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: clamp(1.5rem, 4vw, 3rem); }
.stat { text-align: center; }
.stat__num { font-family: var(--font-sans); font-weight: 800; font-size: clamp(2.3rem, 1.6rem + 2.4vw, 3.8rem); line-height: 1; color: var(--green-deep); }
.section--ink .stat__num { color: var(--green); }
.stat__label { font-size: 0.82rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--text-muted); margin-top: 0.6rem; }
.section--ink .stat__label { color: var(--text-invert-muted); }

.event-rail {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: clamp(2rem, 5vw, 4rem);
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  background: var(--line-dark);
}
.event-rail article {
  min-height: 220px;
  padding: clamp(1.35rem, 2.5vw, 2rem);
  background:
    linear-gradient(145deg, rgba(255,255,255,.08), rgba(255,255,255,.02)),
    var(--ink-soft);
}
.event-rail span {
  display: inline-flex;
  margin-bottom: 1.1rem;
  color: var(--green);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.event-rail strong {
  display: block;
  color: var(--text-invert);
  font-size: clamp(1.1rem, .95rem + .7vw, 1.45rem);
  line-height: 1.15;
  margin-bottom: .7rem;
}
.event-rail p {
  color: var(--text-invert-muted);
  font-size: .94rem;
}

/* ---------- split (about) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }
.split__media {
  aspect-ratio: 4/5;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(150deg, rgba(47,210,125,.96), rgba(31,160,239,.92) 55%, rgba(128,80,240,.92)),
    var(--ink);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 3vw, 2.25rem);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  color: #fff;
}
.split__media::before {
  content: "";
  position: absolute;
  inset: 1rem;
  border: 1px solid rgba(255,255,255,.24);
  border-radius: calc(var(--radius-lg) - .6rem);
}
.split__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 72% 18%, rgba(255,255,255,.28), transparent 42%),
    repeating-linear-gradient(135deg, rgba(255,255,255,.13) 0 1px, transparent 1px 18px);
  opacity: .72;
}
.mission-panel {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1rem;
}
.mission-panel__mark {
  width: 74px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 22px;
  background: rgba(22,20,15,.84);
  box-shadow: 0 18px 40px rgba(22,20,15,.2);
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 2rem;
}
.mission-panel h3 {
  color: #fff;
  font-size: clamp(1.7rem, 1.2rem + 2vw, 2.7rem);
  max-width: 10ch;
}
.mission-panel p {
  color: rgba(255,255,255,.86);
  max-width: 32ch;
}

/* ---------- photo gallery ---------- */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(.75rem, 1.5vw, 1.1rem);
  margin-top: clamp(2rem, 4vw, 3rem);
}
.photo-grid--compact { margin-top: clamp(1.5rem, 3vw, 2.5rem); }
.photo-card {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 220px;
  grid-column: span 4;
  box-shadow: var(--shadow-md);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.photo-card--wide { grid-column: span 8; min-height: 280px; }
.photo-card img {
  width: 100%;
  height: 100%;
  min-height: inherit;
  object-fit: cover;
  display: block;
  transition: transform .7s var(--ease);
}
.photo-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.photo-card:hover img { transform: scale(1.04); }
.photo-card figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 1rem 1.1rem;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: #fff;
  background: linear-gradient(transparent, rgba(0,0,0,.62));
}
.split__media--photo {
  padding: 0;
  background: var(--ink);
  justify-content: flex-end;
}
.split__media--photo::before,
.split__media--photo::after { display: none; }
.split__media--photo > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.split__media__caption {
  position: relative;
  z-index: 1;
  padding: clamp(1.25rem, 2.5vw, 1.75rem);
  background: linear-gradient(transparent, rgba(0,0,0,.72));
}
.split__media__tag {
  display: inline-flex;
  margin-bottom: .45rem;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--green);
}
.split__media__caption p {
  color: rgba(255,255,255,.9);
  font-size: .95rem;
  max-width: 28ch;
}

/* value list */
.value-list { list-style: none; margin: 1.5rem 0 0; padding: 0; display: grid; gap: 1.25rem; }
.value-list li { display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: start; }
.value-list .vk { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-size: 0.85rem; font-weight: 800; color: #fff; flex: 0 0 auto; background: var(--green-deep); }
.value-list strong { display: block; font-size: 1.05rem; }
.value-list span.d { color: var(--text-muted); }
.section--ink .value-list span.d { color: var(--text-invert-muted); }

/* ---------- CTA band ---------- */
.cta-band { background: linear-gradient(135deg, var(--purple), var(--blue)); color: var(--text-invert); border-radius: var(--radius-lg); padding: clamp(2.5rem, 6vw, 4.5rem); text-align: center; position: relative; overflow: hidden; }
.cta-band::before {
  content: "";
  position: absolute;
  inset: auto -5rem -7rem auto;
  width: clamp(220px, 32vw, 420px);
  aspect-ratio: 1;
  background: url("../../assets/images/arc-logo-dark.png") center / contain no-repeat;
  opacity: .08;
  filter: grayscale(1);
  transform: rotate(8deg);
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band h2 { color: var(--text-invert); font-size: var(--fs-h2); margin-bottom: 1rem; }
.cta-band h2 .serif { font-weight: 800; font-style: normal; }
.cta-band p { color: rgba(255,255,255,.84); max-width: 48ch; margin-inline: auto; margin-bottom: 2rem; }
.cta-band .btn--primary { background: #fff; color: var(--purple); box-shadow: 0 12px 28px rgba(22,20,15,.18); }
.cta-band .btn--primary:hover { background: var(--yellow); border-color: var(--yellow); color: var(--ink); }
.cta-band .btn--primary .chip { background: rgba(128,80,240,.12); }

/* page hero (interior pages) */
.page-hero { padding-top: clamp(8rem, 13vw, 10rem); padding-bottom: clamp(2.5rem, 5vw, 4rem); text-align: center; }
.page-hero h1 { font-size: var(--fs-h1); margin-bottom: 1rem; }
.page-hero .hero__inner {
  max-width: none;
  margin-inline: auto;
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: baseline;
  gap: 0.35ch;
}
.page-hero .hero__inner .serif-line,
.page-hero .hero__inner .sans-line { display: block; }
.page-hero .hero__sub { max-width: 54ch; margin-inline: auto; }
.page-hero h1 .serif { font-weight: 800; font-style: normal; }
.page-hero p { color: var(--text-muted); max-width: 54ch; margin-inline: auto; font-size: var(--fs-lead); }