:root {
  --bg: #0f1412;
  --bg-mid: #1a2420;
  --bg-deep: #0a0e0c;
  --accent: #c8e6c9;
  --accent-soft: #a8d5b5;
  --accent-gold: #d4c4a8;
  --ink: #1a221c;
  --ink-soft: #2c3830;
  --white: #ffffff;
  --gap: 0.5em;
  --radius: 0.75em;
  --ease-out: cubic-bezier(0.645, 0.045, 0.355, 1);
  --ease-premium: cubic-bezier(0.22, 1, 0.36, 1);
  --font: "Inter", system-ui, -apple-system, sans-serif;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.14);
  --shadow-btn:
    0 1px 0 rgba(255, 255, 255, 0.65) inset,
    0 -2px 6px rgba(0, 0, 0, 0.08) inset,
    0 10px 28px rgba(0, 0, 0, 0.28),
    0 2px 8px rgba(0, 0, 0, 0.16),
    0 0 0 1px rgba(255, 255, 255, 0.12);
  --shadow-btn-hover:
    0 1px 0 rgba(255, 255, 255, 0.85) inset,
    0 -2px 6px rgba(0, 0, 0, 0.06) inset,
    0 16px 40px rgba(0, 0, 0, 0.32),
    0 6px 16px rgba(168, 213, 181, 0.18),
    0 0 0 1px rgba(255, 255, 255, 0.22);
  --shadow-btn-active:
    0 1px 0 rgba(255, 255, 255, 0.4) inset,
    0 4px 14px rgba(0, 0, 0, 0.22);
}

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

html,
body {
  width: 100%;
  height: 100%;
}

body {
  font-family: var(--font);
  color: var(--white);
  background: var(--bg);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button {
  font: inherit;
  border: 0;
  background: none;
  color: inherit;
  cursor: pointer;
}

img {
  display: block;
  max-width: 100%;
}

/* ---------- App shell ---------- */

.app {
  width: 100vw;
  height: 100%;
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1.25rem, 3vw, 2.5rem);
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 55% at 18% 20%, rgba(90, 140, 110, 0.22) 0%, transparent 55%),
    radial-gradient(ellipse 55% 50% at 82% 75%, rgba(180, 150, 100, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse 90% 70% at 50% 40%, rgba(40, 70, 55, 0.45) 0%, transparent 62%),
    radial-gradient(circle at 50% 100%, rgba(20, 35, 28, 0.9) 0%, transparent 45%),
    linear-gradient(
      155deg,
      #1c2a24 0%,
      #141c18 28%,
      #0f1412 55%,
      #0a100e 78%,
      #080c0a 100%
    );
}

.app::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 40% 30% at 50% 0%, rgba(200, 230, 201, 0.06) 0%, transparent 70%),
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.03) 0%,
      transparent 30%,
      transparent 70%,
      rgba(0, 0, 0, 0.25) 100%
    );
  z-index: 0;
}

.app::after {
  content: "";
  position: absolute;
  width: min(70vw, 720px);
  height: min(70vw, 720px);
  left: 50%;
  top: 42%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(168, 213, 181, 0.07) 0%,
    rgba(100, 140, 115, 0.03) 40%,
    transparent 70%
  );
  filter: blur(40px);
  pointer-events: none;
  z-index: 0;
}

/* ---------- Slider ---------- */

[data-cascading-viewport] {
  --gap: 0.5em;
}

[data-cascading-slide] {
  --clip: 0;
  --radius: 0.75em;
}

.cascading-slider {
  width: 100%;
  max-width: 90em;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.cascading-slider__collection {
  width: 100%;
}

.cascading-slider__list {
  width: 100%;
  height: min(35em, 62vh);
  position: relative;
  overflow: hidden;
}

.cascading-slider__item {
  color: var(--white);
  cursor: pointer;
  will-change: transform, clip-path;
  clip-path: inset(0px calc(var(--clip) * 1px) round var(--radius));
  -webkit-user-select: none;
  user-select: none;
  height: 100%;
  position: absolute;
  inset: 0% auto auto 0%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.cascading-slider__item[data-status="active"] {
  cursor: default;
}

.cascading-slider__item-inner {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
}

.cascading-slider__item-bg {
  z-index: 0;
  position: absolute;
  inset: 0%;
}

.cascading-slider__img {
  object-fit: cover;
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0%;
  pointer-events: none;
  -webkit-user-drag: none;
}

.cascading-slider__item-content {
  z-index: 2;
  background-image: linear-gradient(0deg, rgba(0, 0, 0, 0.55), transparent);
  padding: 2em 2em 3em 2.5em;
  position: absolute;
  inset: auto 0% 0%;
  pointer-events: none;
}

.cascading-slider__h {
  opacity: 0;
  letter-spacing: -0.03em;
  margin: 0;
  font-family: var(--font);
  font-size: clamp(1.35rem, 2.4vw, 2.75em);
  font-weight: 400;
  line-height: 1;
  transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out);
  transform: translate(0, 0.25em);
  transition-delay: 0ms;
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.25);
}

[data-cascading-slide][data-status="active"] .cascading-slider__h {
  transition-delay: 400ms;
  opacity: 1;
  transform: translate(0, 0);
}

/* ---------- Premium controls (bottom center) ---------- */

.cascading-slider__nav {
  display: flex;
  flex-flow: row;
  justify-content: center;
  align-items: center;
  margin-top: clamp(2rem, 4.5vw, 3.75rem);
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 20;
}

.cascading-slider__controls {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem;
  border-radius: 999px;
  background:
    linear-gradient(
      145deg,
      rgba(255, 255, 255, 0.1) 0%,
      rgba(255, 255, 255, 0.04) 45%,
      rgba(0, 0, 0, 0.12) 100%
    );
  border: 1px solid var(--glass-border);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.1) inset,
    0 16px 48px rgba(0, 0, 0, 0.35),
    0 4px 16px rgba(0, 0, 0, 0.2),
    0 0 0 1px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(18px) saturate(1.35);
  -webkit-backdrop-filter: blur(18px) saturate(1.35);
}

.cascading-slider__controls-divider {
  width: 1px;
  height: 1.35rem;
  margin: 0 0.2rem;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(255, 255, 255, 0.22) 40%,
    rgba(255, 255, 255, 0.22) 60%,
    transparent 100%
  );
  opacity: 0.7;
}

.cascading-slider__button {
  position: relative;
  color: var(--ink);
  width: 3.4em;
  height: 3.4em;
  padding: 0;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
  background:
    linear-gradient(160deg, #f4faf4 0%, #dceee0 38%, #c5dfc9 72%, #b4d4ba 100%);
  box-shadow: var(--shadow-btn);
  border: 1px solid rgba(255, 255, 255, 0.45);
  transition:
    transform 0.4s var(--ease-premium),
    box-shadow 0.4s var(--ease-premium),
    background 0.4s var(--ease-premium),
    color 0.25s ease;
  -webkit-tap-highlight-color: transparent;
}

.cascading-slider__button-ring {
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.35);
  pointer-events: none;
  z-index: 2;
  opacity: 0.55;
  transition: opacity 0.35s var(--ease-premium), border-color 0.35s ease;
}

.cascading-slider__button-glow {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    120% 100% at 32% 18%,
    rgba(255, 255, 255, 0.7) 0%,
    rgba(255, 255, 255, 0.15) 42%,
    transparent 68%
  );
  opacity: 0.9;
  pointer-events: none;
  z-index: 0;
  transition: opacity 0.35s var(--ease-premium);
}

.cascading-slider__button-shine {
  position: absolute;
  top: -40%;
  left: -30%;
  width: 70%;
  height: 70%;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, 0.55) 0%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 1;
  opacity: 0.75;
  transition: opacity 0.35s var(--ease-premium), transform 0.45s var(--ease-premium);
}

.cascading-slider__button-icon {
  position: relative;
  z-index: 3;
  width: 1.35rem;
  height: 1.35rem;
  display: block;
  transition: transform 0.4s var(--ease-premium);
}

.cascading-slider__button-icon-trail {
  opacity: 0;
  stroke-dasharray: 8;
  stroke-dashoffset: 8;
  transition:
    opacity 0.3s var(--ease-premium),
    stroke-dashoffset 0.4s var(--ease-premium);
}

.cascading-slider__button:hover {
  color: var(--ink-soft);
  background:
    linear-gradient(160deg, #ffffff 0%, #e8f5ea 36%, #d0e8d4 70%, #c0ddc6 100%);
  box-shadow: var(--shadow-btn-hover);
  transform: translateY(-3px) scale(1.04);
}

.cascading-slider__button:hover .cascading-slider__button-glow {
  opacity: 1;
}

.cascading-slider__button:hover .cascading-slider__button-shine {
  opacity: 1;
  transform: translate(4px, 4px) scale(1.05);
}

.cascading-slider__button:hover .cascading-slider__button-ring {
  opacity: 0.9;
  border-color: rgba(255, 255, 255, 0.55);
}

.cascading-slider__button:hover .cascading-slider__button-icon {
  transform: scale(1.06);
}

.cascading-slider__button:hover .cascading-slider__button-icon-trail {
  opacity: 0.9;
  stroke-dashoffset: 0;
}

.cascading-slider__button[data-cascading-slider-prev]:hover .cascading-slider__button-icon {
  transform: translateX(-2px) scale(1.06);
}

.cascading-slider__button[data-cascading-slider-next]:hover .cascading-slider__button-icon {
  transform: translateX(2px) scale(1.06);
}

.cascading-slider__button:active {
  transform: translateY(0) scale(0.96);
  box-shadow: var(--shadow-btn-active);
}

.cascading-slider__button:focus-visible {
  outline: 2px solid rgba(200, 230, 201, 0.85);
  outline-offset: 4px;
}

.cascading-slider__button.is-disabled {
  opacity: 0.45;
  pointer-events: none;
}

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

@media (max-width: 991px) {
  .cascading-slider__list {
    height: min(28em, 52vh);
  }

  .cascading-slider__item-content {
    padding: 1.5em 1.5em 2em 1.75em;
  }
}

@media (max-width: 767px) {
  .app {
    padding: 1rem;
  }

  .cascading-slider__list {
    height: min(22em, 48vh);
  }

  .cascading-slider__item-content {
    padding: 1.15em 1.15em 1.5em 1.25em;
  }

  .cascading-slider__nav {
    margin-top: 1.75rem;
  }

  .cascading-slider__controls {
    padding: 0.32rem;
    gap: 0.25rem;
  }

  .cascading-slider__button {
    width: 3em;
    height: 3em;
  }

  .cascading-slider__button-icon {
    width: 1.2rem;
    height: 1.2rem;
  }
}

@media (max-width: 479px) {
  .cascading-slider__list {
    height: min(18em, 42vh);
  }

  .cascading-slider__h {
    font-size: 1.2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cascading-slider__h,
  .cascading-slider__button,
  .cascading-slider__button-icon,
  .cascading-slider__button-glow,
  .cascading-slider__button-shine,
  .cascading-slider__button-ring,
  .cascading-slider__button-icon-trail {
    transition-duration: 0.01ms !important;
  }
}