/* Sword-X placeholder — cold studio steel + amber LED */
:root {
  --ink: #0c1a22;
  --ink-soft: #314650;
  --mist-a: #c9d8e2;
  --mist-b: #eef3f6;
  --mist-c: #f7fafb;
  --steel: #5a7585;
  --amber: #d5892a;
  --amber-deep: #a66412;
  --font-brand: "Syne", "Segoe UI", sans-serif;
  --font-body: "Sora", "Segoe UI", sans-serif;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--ink);
  font-family: var(--font-body);
  background: var(--mist-b);
  overflow-x: hidden;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(120% 80% at 12% 18%, #dfeaf1 0%, transparent 55%),
    radial-gradient(90% 70% at 88% 12%, #f3e6d2 0%, transparent 45%),
    linear-gradient(160deg, var(--mist-a) 0%, var(--mist-b) 42%, var(--mist-c) 100%);
}

.mist {
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(circle at 30% 70%, rgba(213, 137, 42, 0.12), transparent 42%),
    radial-gradient(circle at 78% 48%, rgba(60, 110, 130, 0.16), transparent 48%);
  animation: mist-drift 18s ease-in-out infinite alternate;
}

.groove {
  position: absolute;
  inset: 0;
  opacity: 0.2;
  background-image: repeating-linear-gradient(
    -18deg,
    transparent 0,
    transparent 11px,
    rgba(12, 26, 34, 0.04) 11px,
    rgba(12, 26, 34, 0.04) 12px
  );
  mask-image: linear-gradient(90deg, transparent, #000 22%, #000 100%);
}

/* 圆形唱片：裁切后再整体旋转 */
.hero-disc {
  position: absolute;
  right: -4%;
  top: 50%;
  width: min(56vw, 640px);
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  transform: translateY(-50%);
  opacity: 0.94;
  box-shadow:
    0 28px 60px rgba(12, 26, 34, 0.22),
    inset 0 0 0 1px rgba(255, 255, 255, 0.28);
  animation: art-spin 28s linear infinite;
  will-change: transform;
}

.hero-disc::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 7.5%;
  height: 7.5%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #f0f4f6 0%, #2a3d46 55%, #0c1a22 100%);
  box-shadow: 0 0 0 2px rgba(213, 137, 42, 0.45);
  pointer-events: none;
  z-index: 1;
}

.hero-art {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

@keyframes mist-drift {
  from {
    transform: translate3d(-1.5%, -1%, 0) scale(1.02);
  }
  to {
    transform: translate3d(1.5%, 1.2%, 0) scale(1.06);
  }
}

@keyframes art-spin {
  from {
    transform: translateY(-50%) rotate(0deg);
  }
  to {
    transform: translateY(-50%) rotate(360deg);
  }
}

.hero {
  position: relative;
  z-index: 1;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: clamp(2rem, 6vw, 4.5rem) clamp(1.25rem, 5vw, 5rem);
  padding-bottom: 4.5rem;
}

.hero-copy {
  max-width: 34rem;
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.eyebrow {
  margin: 0 0 1.1rem;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.brand {
  margin: 0;
  line-height: 0.92;
  letter-spacing: -0.03em;
}

.brand-mark {
  display: block;
  font-family: var(--font-brand);
  font-weight: 800;
  font-size: clamp(3.4rem, 9.5vw, 6.4rem);
  color: var(--ink);
}

.brand-product {
  display: block;
  margin-top: 0.2em;
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.4vw, 2.15rem);
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.lede {
  margin: 1.35rem 0 0;
  max-width: 28rem;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.65;
  font-weight: 400;
  color: var(--ink-soft);
}

.cta {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.65rem;
}

.cta-pending {
  display: inline-block;
  border-bottom: 2px solid var(--amber);
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.6;
  animation: pulse-amber 2.8s ease-in-out infinite;
}

@keyframes pulse-amber {
  0%,
  100% {
    border-bottom-color: var(--amber);
    opacity: 1;
  }
  50% {
    border-bottom-color: var(--amber-deep);
    opacity: 0.82;
  }
}

.cta-note {
  font-size: 0.82rem;
  color: var(--steel);
}

.foot {
  position: fixed;
  z-index: 2;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.85rem clamp(1.25rem, 5vw, 5rem) 1.1rem;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--steel);
  background: linear-gradient(180deg, transparent, rgba(238, 243, 246, 0.85) 40%);
  pointer-events: none;
}

@media (max-width: 860px) {
  .hero {
    align-items: flex-end;
    min-height: 100svh;
    padding-top: 42vh;
  }

  .hero-disc {
    right: 50%;
    top: 6%;
    width: min(72vw, 340px);
    transform: translateX(50%);
    opacity: 0.9;
    animation: art-spin-mobile 28s linear infinite;
  }

  .brand-mark {
    font-size: clamp(2.8rem, 14vw, 4.2rem);
  }

  .foot {
    position: static;
    background: transparent;
    padding-bottom: 2rem;
  }
}

@keyframes art-spin-mobile {
  from {
    transform: translateX(50%) rotate(0deg);
  }
  to {
    transform: translateX(50%) rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .mist,
  .hero-disc,
  .cta-pending,
  .hero-copy {
    animation: none !important;
  }

  .hero-disc {
    transform: translateY(-50%);
  }

  @media (max-width: 860px) {
    .hero-disc {
      transform: translateX(50%);
    }
  }
}