:root {
  color-scheme: dark;
  font-family: "Comfortaa", system-ui, sans-serif;
  --bg-primary: radial-gradient(circle at bottom, #020817 0%, #01010a 55%, #000000);
  --ui-glass: rgba(255, 255, 255, 0.05);
  --ui-border: rgba(255, 255, 255, 0.15);
  --text-main: #f5f9ff;
  --accent-1: #ff9dff;
  --accent-2: #78ffdd;
  --accent-3: #ffc46b;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background-image: var(--bg-primary);
  color: var(--text-main);
  overflow: hidden;
  position: relative;
}

.starfield,
.bg-carousel {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.starfield {
  background: radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.15), transparent 45%),
    radial-gradient(circle at 80% 10%, rgba(120, 200, 255, 0.12), transparent 50%);
}

.starfield::before,
.starfield::after {
  content: "";
  position: absolute;
  inset: -50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.6) 0.5px, transparent 0) repeat;
  background-size: 180px 180px;
  animation: twinkle 18s linear infinite;
  opacity: 0.45;
}

.starfield::after {
  animation-duration: 26s;
  opacity: 0.25;
  filter: blur(1px);
}

.bg-carousel {
  z-index: 0;
}

.bg-carousel::after {
  content: "";
  position: absolute;
  inset: 0;
  /* 加深遮罩，让背景图更多退到后面，只留一点氛围感 */
  background: linear-gradient(180deg, rgba(1, 5, 14, 0.55) 0%, rgba(0, 0, 10, 0.85) 60%, rgba(0, 0, 5, 0.95) 100%);
  pointer-events: none;
  mix-blend-mode: soft-light;
}

.bg-slide {
  position: absolute;
  inset: -5%;
  opacity: 0;
  transform: scale(1.03) translateZ(0);
  transition: opacity 0.65s ease, transform 18s ease;
  mix-blend-mode: screen;
}

.bg-slide.visible {
  opacity: 0.6;
  transform: scale(1.01);
}

.bg-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 45%;
  /* 降低明度和对比度，避免盖住烟花 */
  filter: saturate(130%) contrast(100%) brightness(0.6);
  transform: scale(1.08);
  transition: transform 18s ease, filter 6s ease;
}

.bg-slide.visible img {
  transform: scale(1);
  filter: saturate(145%) contrast(105%) brightness(0.75);
}

canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 1;
}

.hero {
  position: fixed;
  bottom: 12vh;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: rgba(255, 255, 255, 0.9);
  letter-spacing: 0.08em;
  z-index: 3;
  pointer-events: none;
  text-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
  animation: float 16s ease-in-out infinite;
}

.hero h1 {
  font-size: clamp(2.4rem, 4vw, 3.6rem);
  margin: 0.2rem 0;
  text-transform: uppercase;
  font-weight: 700;
}

.hero-eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  opacity: 0.65;
  margin: 0;
}

.hero-subtitle {
  font-size: 0.95rem;
  margin: 0.35rem 0 0;
  opacity: 0.8;
}

.aurora {
  position: fixed;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: screen;
  background: conic-gradient(
      from 120deg,
      rgba(255, 166, 255, 0.08),
      transparent 45%,
      rgba(118, 214, 255, 0.1),
      transparent
    ),
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.12), transparent 40%),
    radial-gradient(circle at 80% 15%, rgba(147, 187, 255, 0.2), transparent 45%);
  filter: blur(90px);
  z-index: 2;
}

.glow {
  position: fixed;
  width: 30vw;
  height: 30vw;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 2;
}

.glow-left {
  background: #6bffed;
  bottom: -10vw;
  left: -5vw;
}

.glow-right {
  background: #ff82f7;
  top: -5vw;
  right: -10vw;
}

.ui {
  /* 上面的东西暂时隐藏
  position: fixed;
  top: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1rem 1.5rem;
  border-radius: 999px;
  background: var(--ui-glass);
  border: 1px solid var(--ui-border);
  backdrop-filter: blur(16px) saturate(130%);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  pointer-events: none;
  z-index: 3; */
  display: none;
}

.ui label,
.badge,
.cta {
  pointer-events: auto;
}

.badge {
  display: flex;
  flex-direction: column;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.badge small {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  opacity: 0.7;
}

.controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.controls label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  color: rgba(245, 249, 255, 0.85);
}

select,
input[type="range"],
input[type="checkbox"] {
  accent-color: var(--accent-1);
}

select,
input[type="range"] {
  border-radius: 999px;
  border: 1px solid var(--ui-border);
  background: rgba(255, 255, 255, 0.04);
  color: inherit;
  padding: 0.35rem 0.75rem;
  font: inherit;
}

input[type="checkbox"] {
  width: 1.25rem;
  height: 1.25rem;
}

.pill-button {
  border: 1px solid var(--ui-border);
  border-radius: 999px;
  padding: 0.35rem 1.2rem;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  font: inherit;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.3s ease;
}

.pill-button[aria-pressed="true"] {
  background: linear-gradient(120deg, var(--accent-2), var(--accent-1));
  color: #0a0a12;
}

.pill-button:active {
  transform: translateY(1px);
}

.hero,
.ui,
.cta {
  pointer-events: none;
}

.ui label,
.badge,
.cta,
.controls,
.pill-button {
  pointer-events: auto;
}

.cta {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  opacity: 0.65;
}

audio {
  display: none;
}

.intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 5;
  background: radial-gradient(circle at center, rgba(7, 12, 28, 0.9), rgba(1, 2, 8, 0.98));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  backdrop-filter: blur(18px);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.intro-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.intro-card {
  padding: clamp(2rem, 4vw, 3.5rem);
  border-radius: 28px;
  background: rgba(13, 19, 36, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 35px 80px rgba(0, 0, 0, 0.6);
  max-width: min(520px, 90vw);
}

.intro-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.45em;
  font-size: 0.75rem;
  opacity: 0.7;
  margin: 0 0 1rem;
}

.intro-card h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  letter-spacing: 0.06em;
}

.intro-copy {
  margin: 0 auto 1.5rem;
  max-width: 32ch;
  opacity: 0.85;
  line-height: 1.8;
}

.intro-button {
  border: none;
  border-radius: 999px;
  padding: 0.85rem 2.6rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #04050b;
  background: linear-gradient(120deg, #9dffe4, #ffb1ff);
  cursor: pointer;
  box-shadow: 0 15px 35px rgba(255, 177, 255, 0.35);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.intro-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 25px 45px rgba(255, 177, 255, 0.45);
}

.intro-button:active {
  transform: translateY(1px);
}

.intro-card small {
  display: block;
  margin-top: 1rem;
  opacity: 0.6;
  letter-spacing: 0.2em;
}

@keyframes twinkle {
  from {
    transform: translate3d(0, 0, 0) rotate(0deg);
  }
  to {
    transform: translate3d(10%, -10%, 0) rotate(360deg);
  }
}

@keyframes float {
  0% {
    transform: translate(-50%, 0);
  }
  50% {
    transform: translate(-50%, -10px);
  }
  100% {
    transform: translate(-50%, 0);
  }
}

@media (max-width: 900px) {
  .ui {
    flex-direction: column;
    border-radius: 24px;
    width: min(90vw, 480px);
    text-align: center;
  }

  .controls {
    flex-direction: column;
    width: 100%;
  }

  .pill-button {
    width: 100%;
  }

  select,
  input[type="range"] {
    width: 100%;
  }

  .hero {
    bottom: 18vh;
    width: min(90vw, 480px);
  }
}