/* ============================================
   Stacking Sticky Cards (Bounce) — Premium UI
   ============================================ */

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

:root {
  --bg: #efe9e1;
  --bg-deep: #e4dcd2;
  --text: #141210;
  --text-muted: rgb(20 18 16 / 58%);
  --card-light: #faf8f5;
  --card-sage: #a8a38a;
  --card-ink: #151311;
  --accent: #8b7355;
  --line: rgb(20 18 16 / 10%);
  --radius: 1.75rem;
  --radius-sm: 999px;
  --sticky-top: 4.5rem;
  --container: 88rem;
  --pad-x: clamp(1.25rem, 4vw, 2.5rem);
  --shadow-card:
    0 1px 0 rgb(255 255 255 / 45%) inset,
    0 2px 4px rgb(20 18 16 / 4%),
    0 18px 48px rgb(20 18 16 / 10%),
    0 48px 80px rgb(20 18 16 / 6%);
  --shadow-card-ink:
    0 1px 0 rgb(255 255 255 / 8%) inset,
    0 2px 4px rgb(0 0 0 / 12%),
    0 24px 56px rgb(0 0 0 / 28%),
    0 48px 90px rgb(0 0 0 / 18%);
  --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

html.lenis,
html.lenis body {
  height: auto;
}

.lenis.lenis-smooth {
  scroll-behavior: auto !important;
}

.lenis.lenis-smooth [data-lenis-prevent] {
  overscroll-behavior: contain;
}

.lenis.lenis-stopped {
  overflow: hidden;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* ---------- Ambient background ---------- */

.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
}

.ambient__orb--a {
  width: min(52vw, 36rem);
  height: min(52vw, 36rem);
  top: -8%;
  left: -6%;
  background: radial-gradient(circle, #f5e6d3 0%, transparent 70%);
}

.ambient__orb--b {
  width: min(48vw, 32rem);
  height: min(48vw, 32rem);
  bottom: 10%;
  right: -8%;
  background: radial-gradient(circle, #d5cfc0 0%, transparent 70%);
  opacity: 0.4;
}

.ambient__grain {
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px;
  mix-blend-mode: multiply;
}

/* ---------- Layout ---------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  position: relative;
  z-index: 1;
}

/* ---------- Badge ---------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgb(255 255 255 / 55%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  box-shadow: 0 1px 0 rgb(255 255 255 / 70%) inset;
}

.badge--soft {
  background: rgb(20 18 16 / 4%);
}

.badge::before {
  content: "";
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgb(139 115 85 / 18%);
}

/* ---------- Intro / Outro ---------- */

.intro,
.outro {
  min-height: 78vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding-block: clamp(5rem, 12vh, 9rem) clamp(3rem, 8vh, 5rem);
  position: relative;
  z-index: 1;
}

.intro__inner,
.outro__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  max-width: 42rem;
}

.intro__title,
.outro__title {
  font-family: var(--font-serif);
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--text);
}

.intro__title em,
.outro__title em {
  font-style: italic;
  color: rgb(20 18 16 / 72%);
}

.intro__text,
.outro__text {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  font-weight: 400;
  color: var(--text-muted);
  max-width: 30rem;
  line-height: 1.65;
}

.scroll-cue {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-top: 2rem;
  color: var(--text-muted);
}

.scroll-cue__line {
  width: 1px;
  height: 3.25rem;
  background: linear-gradient(
    to bottom,
    rgb(20 18 16 / 0%),
    rgb(20 18 16 / 35%),
    rgb(20 18 16 / 0%)
  );
  position: relative;
  overflow: hidden;
}

.scroll-cue__line::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 30%;
  background: var(--text);
  opacity: 0.55;
  animation: cue-travel 1.8s ease-in-out infinite;
}

.scroll-cue__label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

@keyframes cue-travel {
  0% {
    top: -30%;
  }
  100% {
    top: 100%;
  }
}

.outro {
  min-height: 62vh;
  padding-block: 4rem 10rem;
}

/* ---------- Section headers ---------- */

.section-header {
  display: flex;
  align-items: flex-end;
  gap: 1.25rem;
  margin-bottom: clamp(2.5rem, 6vh, 4rem);
  max-width: 40rem;
}

.section-header__index {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  line-height: 0.9;
  color: rgb(20 18 16 / 18%);
  letter-spacing: -0.03em;
}

.section-header__eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.section-header__title {
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

/* ---------- Cards stack ---------- */

.cards-stack {
  padding-block: 12dvh 18dvh;
  position: relative;
  z-index: 1;
}

.cards-stack--wide {
  padding-top: 6dvh;
}

.cards-stack__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  gap: 5em;
}

.cards-stack__item {
  position: sticky;
  top: var(--sticky-top);
  flex: none;
  width: 100%;
  max-width: 24em;
  will-change: transform;
}

.cards-stack__item.is--wide {
  max-width: 58em;
}

/* ---------- Card face ---------- */

.cards-stack-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 100%;
  aspect-ratio: 2 / 3;
  padding: clamp(1.75rem, 3vw, 2.4rem);
  border-radius: var(--radius);
  background:
    linear-gradient(165deg, rgb(255 255 255 / 72%) 0%, transparent 42%),
    var(--card-light);
  color: var(--text);
  border: 1px solid rgb(255 255 255 / 55%);
  transform-origin: center center;
  backface-visibility: hidden;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  isolation: isolate;
}

.cards-stack-card__glow {
  position: absolute;
  inset: auto -20% 35% auto;
  width: 70%;
  height: 45%;
  background: radial-gradient(
    circle,
    rgb(255 255 255 / 55%) 0%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}

.cards-stack-card > *:not(.cards-stack-card__glow) {
  position: relative;
  z-index: 1;
}

.cards-stack-card.is--sage {
  background:
    linear-gradient(165deg, rgb(255 255 255 / 22%) 0%, transparent 45%),
    linear-gradient(180deg, #b5b09a 0%, var(--card-sage) 100%);
  border-color: rgb(255 255 255 / 22%);
  color: #141210;
}

.cards-stack-card.is--ink {
  background:
    linear-gradient(155deg, rgb(255 255 255 / 8%) 0%, transparent 40%),
    linear-gradient(180deg, #1d1a18 0%, var(--card-ink) 100%);
  border-color: rgb(255 255 255 / 8%);
  color: #f6f2ec;
  box-shadow: var(--shadow-card-ink);
}

.cards-stack-card.is--ink .cards-stack-card__phase,
.cards-stack-card.is--ink .cards-stack-card__lead,
.cards-stack-card.is--ink .cards-stack-card__services {
  color: rgb(246 242 236 / 72%);
}

.cards-stack-card.is--ink .cards-stack-card__services li {
  border-color: rgb(246 242 236 / 12%);
}

.cards-stack-card.is--ink .cards-stack-card__glow {
  background: radial-gradient(
    circle,
    rgb(255 255 255 / 10%) 0%,
    transparent 70%
  );
  inset: auto auto 30% -15%;
}

.cards-stack-card.is--wide {
  aspect-ratio: 5 / 3;
  padding: clamp(2rem, 3.5vw, 2.75rem);
}

.cards-stack-card__wide-layout {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  gap: 1.5rem;
}

.cards-stack-card__start {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.cards-stack-card__phase {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgb(20 18 16 / 48%);
}

.cards-stack-card__number {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(4.5rem, 10vw, 6.5rem);
  font-weight: 400;
  line-height: 0.9;
  letter-spacing: -0.04em;
  opacity: 0.92;
}

.cards-stack-card__end {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.cards-stack-card__h {
  margin: 0;
  font-size: clamp(1.85rem, 3.8vw, 2.65rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.cards-stack-card__h.is--l {
  font-size: clamp(2rem, 4.2vw, 3.25rem);
}

.cards-stack-card__lead {
  font-size: 0.95rem;
  font-weight: 400;
  line-height: 1.5;
  color: rgb(20 18 16 / 58%);
  max-width: 22rem;
}

.cards-stack-card__services {
  list-style: none;
  display: flex;
  flex-direction: column;
  margin-top: 0.5rem;
  min-height: 0;
}

.cards-stack-card__services li {
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.01em;
  padding: 0.55rem 0;
  border-top: 1px solid rgb(20 18 16 / 10%);
  color: rgb(20 18 16 / 78%);
}

.cards-stack-card__services li:last-child {
  border-bottom: 1px solid rgb(20 18 16 / 10%);
}

.cards-stack-card__services.is--inline {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.cards-stack-card__services.is--inline li {
  border: 1px solid rgb(20 18 16 / 12%);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 500;
  background: rgb(255 255 255 / 28%);
  backdrop-filter: blur(6px);
}

.cards-stack-card.is--ink .cards-stack-card__services.is--inline li {
  border-color: rgb(246 242 236 / 14%);
  background: rgb(255 255 255 / 6%);
  color: rgb(246 242 236 / 88%);
}

.cards-stack-card.is--sage .cards-stack-card__services.is--inline li {
  border-color: rgb(20 18 16 / 12%);
  background: rgb(255 255 255 / 22%);
}

/* ---------- Responsive ---------- */

@media screen and (max-width: 991px) {
  .cards-stack-card.is--wide {
    aspect-ratio: 5 / 4;
  }

  .cards-stack-card__h.is--l {
    font-size: clamp(1.85rem, 5vw, 2.5rem);
  }
}

@media screen and (max-width: 767px) {
  :root {
    --sticky-top: 3.25rem;
  }

  .cards-stack__list {
    gap: 3.5em;
  }

  .cards-stack__item.is--wide {
    max-width: 24em;
  }

  .cards-stack-card {
    font-size: 0.92em;
  }

  .cards-stack-card.is--wide {
    aspect-ratio: 2 / 3;
  }

  .cards-stack-card__services.is--inline {
    flex-direction: column;
    gap: 0;
  }

  .cards-stack-card__services.is--inline li {
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    border-top: 1px solid rgb(20 18 16 / 10%);
    border-bottom: none;
    padding: 0.55rem 0;
    background: transparent;
    backdrop-filter: none;
  }

  .cards-stack-card__services.is--inline li:last-child {
    border-bottom: 1px solid rgb(20 18 16 / 10%);
  }

  .cards-stack-card.is--ink .cards-stack-card__services.is--inline li {
    border-color: rgb(246 242 236 / 12%);
    background: transparent;
  }

  .intro,
  .outro {
    min-height: 58vh;
    padding-block: 4.5rem 2.5rem;
  }

  .section-header {
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-cue__line::after {
    animation: none;
  }

  .cards-stack-card {
    transition: none;
  }
}