:root {
  --ink: #18212b;
  --ink-soft: #4a5664;
  --muted: #6b7785;
  --line: rgba(24, 33, 43, 0.12);
  --accent: #1f6f5b;
  --accent-deep: #145244;
  --surface: rgba(255, 252, 247, 0.72);
  --font-display: "Space Grotesk", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;

  --bs-body-color: var(--ink);
  --bs-body-bg: transparent;
  --bs-success: var(--accent);
  --bs-success-rgb: 31, 111, 91;
  --bs-link-color: var(--accent-deep);
  --bs-link-hover-color: var(--accent);
  --bs-border-radius: 10px;
  --bs-border-radius-lg: 16px;
}

html {
  scroll-behavior: smooth;
}

body {
  position: relative;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  background:
    radial-gradient(1100px 560px at 6% -12%, rgba(31, 111, 91, 0.2), transparent 55%),
    radial-gradient(900px 480px at 100% 0%, rgba(196, 140, 72, 0.14), transparent 52%),
    linear-gradient(165deg, #d9e3ea 0%, #e7ebe4 45%, #f0ebe2 100%);
  background-attachment: fixed;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.3;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
  z-index: 0;
}

body > * {
  position: relative;
  z-index: 1;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.site-hero {
  padding: clamp(3rem, 8vw, 5rem) 0 1.5rem;
  animation: rise 0.55s ease both;
}

.brand-icon {
  display: block;
  width: clamp(4.5rem, 12vw, 6rem);
  height: auto;
  margin: 0 auto 1rem;
  border-radius: 22%;
  box-shadow: 0 14px 32px rgba(24, 33, 43, 0.16);
}

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  font-size: clamp(2.8rem, 9vw, 4.8rem);
}

.brand span {
  color: var(--accent);
}

.lede {
  margin: 1rem auto 0;
  max-width: 28rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.lede strong {
  color: var(--accent);
  font-weight: 700;
}

.btn-download {
  --bs-btn-color: #f7fffb;
  --bs-btn-bg: var(--accent);
  --bs-btn-border-color: transparent;
  --bs-btn-hover-color: #f7fffb;
  --bs-btn-hover-bg: var(--accent-deep);
  --bs-btn-hover-border-color: transparent;
  --bs-btn-active-color: #f7fffb;
  --bs-btn-active-bg: var(--accent-deep);
  --bs-btn-active-border-color: transparent;
  --bs-btn-disabled-color: #f7fffb;
  --bs-btn-disabled-bg: var(--accent);
  --bs-btn-disabled-border-color: transparent;
  font-weight: 600;
  padding: 0.78rem 1.35rem;
  border-radius: 10px;
  transition: transform 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.btn-download:hover:not(.disabled):not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(31, 111, 91, 0.28);
}

.btn-download.disabled,
.btn-download:disabled {
  opacity: 0.45;
}

.other-toggle {
  color: var(--muted) !important;
  text-decoration: underline !important;
  text-underline-offset: 0.18em;
}

.other-toggle:hover {
  color: var(--ink-soft) !important;
}

.other-modal {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 252, 247, 0.96);
  backdrop-filter: blur(12px);
  box-shadow: 0 22px 48px rgba(24, 33, 43, 0.16);
}

.other-modal .modal-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.other-modal-list {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
}

.other-modal-item {
  color: var(--ink);
  font-weight: 500;
  padding: 0.95rem 1rem;
  background: rgba(255, 255, 255, 0.55);
  border-color: var(--line) !important;
}

.other-modal-item:hover {
  color: var(--accent-deep);
  background: rgba(31, 111, 91, 0.08);
}

.other-modal-item + .other-modal-item {
  border-top-width: 1px;
}

.site-carousel {
  animation: rise 0.6s ease 0.05s both;
}

.carousel-copy {
  min-height: 4.5rem;
}

.carousel-heading {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.5vw, 1.9rem);
  letter-spacing: -0.03em;
  font-weight: 700;
}

.carousel-desc {
  margin-top: 0.55rem;
  max-width: 36rem;
  color: var(--ink-soft);
}

.shot-frame {
  border-radius: 16px;
  border: 1px solid var(--line);
  box-shadow: 0 22px 48px rgba(24, 33, 43, 0.12);
  overflow: hidden;
  background: #0b0d10;
}

.carousel-shot {
  aspect-ratio: 16 / 10.5;
  object-fit: cover;
  object-position: top center;
}

#introCarousel .carousel-indicators [data-bs-target] {
  width: 0.55rem;
  height: 0.55rem;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.45);
  opacity: 1;
  transition: width 0.2s ease, background 0.2s ease;
}

#introCarousel .carousel-indicators .active {
  width: 1.35rem;
  background: var(--accent);
}

#introCarousel .carousel-control-prev,
#introCarousel .carousel-control-next {
  width: 3rem;
  opacity: 0.85;
}

#introCarousel .carousel-control-prev-icon,
#introCarousel .carousel-control-next-icon {
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.45));
}

.download-panel {
  padding: 1.7rem 1.5rem 1.5rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--surface);
  backdrop-filter: blur(10px);
  box-shadow: 0 18px 40px rgba(24, 33, 43, 0.08);
  animation: rise 0.65s ease 0.08s both;
}

.download-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.site-foot {
  padding: 0 0 2.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 720px) {
  .site-hero {
    padding-top: 2.5rem;
  }
}