:root {
  --bg: #020305;
  --silver-a: #f8fbff;
  --silver-b: #dfe8f1;
  --silver-c: #97a4b4;
  --silver-d: #2f3946;
  --panel-border: rgba(202, 220, 239, 0.24);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: white;
  font-family: "Avenir Next", "SF Pro Display", "Helvetica Neue", "Segoe UI", sans-serif;
}

body {
  overflow: hidden;
}

.app-shell {
  position: relative;
  width: 100vw;
  height: 100vh;
  background:
    radial-gradient(circle at 18% 14%, rgba(163, 182, 204, 0.13), transparent 34%),
    radial-gradient(circle at 86% 18%, rgba(146, 160, 180, 0.1), transparent 32%),
    radial-gradient(circle at 50% 84%, rgba(94, 111, 129, 0.16), transparent 38%),
    #030507;
}

.intro-scene {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 50% 40%, rgba(168, 184, 204, 0.16), transparent 36%),
    radial-gradient(circle at 50% 60%, rgba(150, 163, 179, 0.1), transparent 45%),
    #000;
  animation: introFadeOut 1.2s cubic-bezier(0.22, 0.72, 0.2, 1) 13.8s forwards;
}

.void-layer {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, transparent 28%, rgba(0, 0, 0, 0.74) 90%);
}

.lux-halo {
  position: absolute;
  border-radius: 50%;
  filter: blur(74px);
  pointer-events: none;
}

.lux-halo-a {
  width: min(44vw, 740px);
  height: min(44vw, 740px);
  background: rgba(215, 227, 239, 0.13);
  animation: haloPulseA 7s ease-in-out infinite;
}

.lux-halo-b {
  width: min(26vw, 420px);
  height: min(26vw, 420px);
  background: rgba(240, 247, 255, 0.1);
  animation: haloPulseB 5.8s ease-in-out infinite;
}

.intro-copy {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 2rem;
}

.title-silver {
  margin: 0;
  position: relative;
  font-weight: 800;
  font-size: clamp(3.2rem, 10.8vw, 12rem);
  letter-spacing: clamp(0.05em, 0.32vw, 0.12em);
  text-transform: uppercase;
  line-height: 0.9;
  color: transparent;
  background: linear-gradient(
    160deg,
    var(--silver-a) 0%,
    var(--silver-b) 23%,
    var(--silver-c) 47%,
    var(--silver-a) 58%,
    var(--silver-d) 77%,
    var(--silver-a) 100%
  );
  background-size: 220% 220%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-stroke: 1px rgba(220, 234, 249, 0.35);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.28),
    0 12px 26px rgba(26, 31, 39, 0.65),
    0 26px 56px rgba(0, 0, 0, 0.95),
    0 0 28px rgba(194, 212, 230, 0.34);
  transform: perspective(900px) rotateX(10deg) translateZ(0);
  animation:
    silverShift 8s linear infinite,
    titleSettle 1.8s cubic-bezier(0.15, 0.89, 0.21, 1) both;
}

.title-silver::after {
  content: "";
  position: absolute;
  inset: -10% -25%;
  background: linear-gradient(
    104deg,
    transparent 31%,
    rgba(255, 255, 255, 0.04) 41%,
    rgba(255, 255, 255, 0.88) 49%,
    rgba(222, 237, 255, 0.28) 57%,
    transparent 67%
  );
  filter: blur(2px);
  mix-blend-mode: screen;
  transform: translateX(-165%);
  animation: gleamSweep 4.6s cubic-bezier(0.18, 0.82, 0.2, 1) infinite;
  pointer-events: none;
}

.title-sub {
  margin: 1.7rem 0 0;
  font-size: clamp(0.78rem, 1.22vw, 1.14rem);
  letter-spacing: clamp(0.16em, 0.44vw, 0.33em);
  text-transform: uppercase;
  color: rgba(222, 231, 241, 0.72);
  text-shadow: 0 0 16px rgba(211, 225, 240, 0.2);
  animation: subtitleIn 1.2s ease 0.4s both;
}

.title-sub .tiger-accent {
  color: #ff8c2a;
  text-shadow:
    0 0 10px rgba(255, 140, 42, 0.68),
    0 0 20px rgba(255, 124, 31, 0.36);
}

.deck-shell {
  position: relative;
  width: 100%;
  height: 100%;
}

.deck-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 18;
  padding: clamp(0.8rem, 1.6vw, 1.3rem) clamp(1rem, 2.4vw, 2.2rem);
  background: linear-gradient(180deg, rgba(2, 4, 7, 0.82), rgba(2, 4, 7, 0));
  pointer-events: none;
}

.deck-kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.32em;
  font-size: clamp(0.64rem, 0.84vw, 0.84rem);
  color: rgba(201, 217, 234, 0.78);
}

.deck-header h2 {
  margin: 0.42rem 0 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: clamp(1.06rem, 1.68vw, 1.72rem);
  color: rgba(241, 247, 255, 0.94);
}

.deck-meta {
  margin: 0.24rem 0 0;
  font-size: clamp(0.74rem, 0.9vw, 0.92rem);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(176, 196, 214, 0.72);
}

.scene-nav {
  position: fixed;
  right: clamp(0.4rem, 1.1vw, 1rem);
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem;
  width: clamp(4.3rem, 6vw, 5.7rem);
}

.scene-chip {
  text-decoration: none;
  border: 1px solid rgba(186, 205, 224, 0.22);
  border-radius: 999px;
  text-align: center;
  font-size: clamp(0.64rem, 0.78vw, 0.78rem);
  padding: 0.22rem 0.24rem;
  color: rgba(212, 228, 245, 0.86);
  background: rgba(8, 14, 22, 0.58);
  backdrop-filter: blur(8px);
  box-shadow: inset 0 1px 0 rgba(242, 249, 255, 0.08);
}

.scene-chip:hover {
  border-color: rgba(217, 234, 249, 0.5);
  color: rgba(247, 251, 255, 0.96);
}

.scene-chip.is-active {
  border-color: rgba(232, 242, 252, 0.7);
  background: rgba(224, 236, 249, 0.2);
  color: rgba(251, 254, 255, 0.98);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.22),
    0 0 22px rgba(190, 212, 234, 0.24);
}

.deck-scroll {
  height: 100%;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
}

.board-scene {
  position: relative;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: clamp(6.8rem, 12vw, 9rem) clamp(1rem, 5vw, 5.2rem) clamp(3.2rem, 5.2vw, 5rem);
  scroll-snap-align: start;
}

.board-scene:nth-of-type(odd) {
  background:
    radial-gradient(circle at 18% 24%, rgba(145, 161, 179, 0.16), transparent 34%),
    radial-gradient(circle at 82% 20%, rgba(130, 144, 162, 0.12), transparent 33%),
    linear-gradient(170deg, rgba(5, 8, 12, 0.88), rgba(5, 8, 13, 0.94));
}

.board-scene:nth-of-type(even) {
  background:
    radial-gradient(circle at 14% 78%, rgba(139, 156, 176, 0.18), transparent 34%),
    radial-gradient(circle at 86% 16%, rgba(124, 142, 160, 0.1), transparent 35%),
    linear-gradient(170deg, rgba(4, 7, 11, 0.9), rgba(5, 8, 13, 0.96));
}

.calm-veil {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(86px);
}

.calm-veil-a {
  width: min(42vw, 780px);
  height: min(42vw, 780px);
  left: -10%;
  top: -6%;
  background: rgba(204, 221, 239, 0.08);
  animation: calmFloatA 16s ease-in-out infinite;
}

.calm-veil-b {
  width: min(36vw, 680px);
  height: min(36vw, 680px);
  right: -8%;
  bottom: -10%;
  background: rgba(157, 175, 193, 0.08);
  animation: calmFloatB 19s ease-in-out infinite;
}

.scene-panel {
  position: relative;
  width: min(1180px, 100%);
  border: 1px solid var(--panel-border);
  border-radius: 28px;
  padding: clamp(1.2rem, 2.9vw, 2.6rem);
  background:
    linear-gradient(156deg, rgba(22, 31, 41, 0.74), rgba(10, 14, 21, 0.8)),
    radial-gradient(circle at 14% 12%, rgba(221, 234, 248, 0.08), transparent 44%);
  box-shadow:
    inset 0 1px 0 rgba(243, 250, 255, 0.18),
    inset 0 -1px 0 rgba(166, 184, 201, 0.14),
    0 34px 88px rgba(0, 0, 0, 0.62),
    0 0 44px rgba(171, 194, 215, 0.1);
  backdrop-filter: blur(14px);
}

.scene-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(
    124deg,
    transparent 14%,
    rgba(255, 255, 255, 0.08) 44%,
    transparent 72%
  );
}

.scene-tag {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.34em;
  font-size: clamp(0.66rem, 0.9vw, 0.9rem);
  color: rgba(201, 218, 235, 0.75);
}

.scene-title {
  margin: 0.74rem 0 0;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  line-height: 0.94;
  font-size: clamp(1.72rem, 4.5vw, 4.9rem);
  color: rgba(239, 246, 255, 0.95);
  text-shadow: 0 10px 26px rgba(0, 0, 0, 0.42);
}

.scene-summary {
  margin: 1rem 0 0;
  max-width: 70ch;
  font-size: clamp(0.98rem, 1.42vw, 1.38rem);
  line-height: 1.54;
  color: rgba(206, 221, 236, 0.9);
}

.scene-detail {
  margin: 0.7rem 0 0;
  max-width: 72ch;
  font-size: clamp(0.9rem, 1.1vw, 1.04rem);
  line-height: 1.58;
  color: rgba(187, 204, 221, 0.9);
}

.scene-points {
  margin: clamp(1rem, 1.8vw, 1.6rem) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(0.6rem, 1vw, 0.9rem);
}

.scene-points li {
  border: 1px solid rgba(186, 206, 224, 0.2);
  border-radius: 14px;
  background:
    linear-gradient(156deg, rgba(25, 35, 47, 0.72), rgba(11, 16, 23, 0.78)),
    radial-gradient(circle at 12% 12%, rgba(219, 234, 248, 0.08), transparent 45%);
  box-shadow: inset 0 1px 0 rgba(243, 250, 255, 0.12);
  padding: clamp(0.72rem, 1.2vw, 1rem) clamp(0.8rem, 1.4vw, 1.2rem);
  font-size: clamp(0.9rem, 1.14vw, 1.12rem);
  line-height: 1.48;
  color: rgba(199, 216, 233, 0.88);
}

@media (max-width: 980px) {
  .scene-nav {
    display: none;
  }

  .deck-header {
    padding-right: 1rem;
  }

  .scene-title {
    line-height: 1.02;
  }
}

@keyframes titleSettle {
  0% {
    opacity: 0;
    transform: perspective(900px) rotateX(16deg) translateY(22px) scale(0.98);
    filter: blur(6px);
  }

  100% {
    opacity: 1;
    transform: perspective(900px) rotateX(10deg) translateY(0) scale(1);
    filter: blur(0);
  }
}

@keyframes subtitleIn {
  0% {
    opacity: 0;
    transform: translateY(14px);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes silverShift {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

@keyframes gleamSweep {
  0% {
    transform: translateX(-165%);
    opacity: 0;
  }

  20% {
    opacity: 0.96;
  }

  46% {
    opacity: 0.86;
  }

  100% {
    transform: translateX(165%);
    opacity: 0;
  }
}

@keyframes haloPulseA {
  0%,
  100% {
    transform: scale(0.92);
    opacity: 0.48;
  }

  50% {
    transform: scale(1.08);
    opacity: 0.86;
  }
}

@keyframes haloPulseB {
  0%,
  100% {
    transform: scale(0.88);
    opacity: 0.45;
  }

  50% {
    transform: scale(1.12);
    opacity: 0.84;
  }
}

@keyframes calmFloatA {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.48;
  }

  50% {
    transform: translate3d(22px, 18px, 0) scale(1.08);
    opacity: 0.74;
  }
}

@keyframes calmFloatB {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.44;
  }

  50% {
    transform: translate3d(-28px, -22px, 0) scale(1.06);
    opacity: 0.72;
  }
}

@keyframes introFadeOut {
  0% {
    opacity: 1;
    visibility: visible;
  }

  100% {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }
}