:root {
  color-scheme: light;
  --bg: #eef5ec;
  --bg-2: #f8fbf6;
  --text: #132016;
  --muted: rgba(19, 32, 22, 0.66);
  --soft: rgba(19, 32, 22, 0.1);
  --glass: rgba(255, 255, 255, 0.58);
  --glass-strong: rgba(255, 255, 255, 0.76);
  --stroke: rgba(22, 44, 28, 0.13);
  --stroke-strong: rgba(22, 44, 28, 0.22);
  --accent: #5d7f35;
  --accent-2: #b6d992;
  --accent-3: #2bb8a2;
  --shadow: 0 24px 70px rgba(52, 74, 48, 0.18);
  --inner: inset 0 1px 0 rgba(255, 255, 255, 0.72);
  --radius-lg: 34px;
  --radius-md: 24px;
  --radius-sm: 18px;
  --max: 1180px;
  --font: "Source Han Sans SC", "Noto Sans CJK SC", "Noto Sans SC", "思源黑体", "Source Han Sans CN", "PingFang SC", system-ui, sans-serif;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #020403;
  --bg-2: #07100d;
  --text: #f5f8f3;
  --muted: rgba(245, 248, 243, 0.62);
  --soft: rgba(255, 255, 255, 0.1);
  --glass: rgba(12, 18, 16, 0.54);
  --glass-strong: rgba(14, 20, 18, 0.76);
  --stroke: rgba(218, 238, 204, 0.16);
  --stroke-strong: rgba(218, 238, 204, 0.25);
  --accent: #b6d992;
  --accent-2: #5d7f35;
  --accent-3: #48d6c1;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.46);
  --inner: inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 12% 8%, rgba(182, 217, 146, 0.42), transparent 32rem),
    radial-gradient(circle at 82% 6%, rgba(43, 184, 162, 0.22), transparent 28rem),
    linear-gradient(135deg, var(--bg), var(--bg-2));
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
  transition: background 360ms ease, color 260ms ease;
}

html[data-theme="dark"] body {
  background:
    radial-gradient(circle at 12% 8%, rgba(93, 127, 53, 0.34), transparent 30rem),
    radial-gradient(circle at 82% 6%, rgba(28, 126, 113, 0.2), transparent 26rem),
    linear-gradient(135deg, #000, #07100d 46%, #030605);
}

a {
  color: inherit;
  text-decoration: none;
}

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

.ambient {
  position: fixed;
  z-index: -2;
  width: 36rem;
  height: 36rem;
  pointer-events: none;
  border-radius: 999px;
  filter: blur(54px);
  opacity: 0.34;
}

.ambient-a {
  left: -12rem;
  top: 18rem;
  background: #b6d992;
}

.ambient-b {
  right: -12rem;
  top: 34rem;
  background: #2bb8a2;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 10;
  width: min(calc(100% - 28px), var(--max));
  margin: 16px auto 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 18px;
  padding: 10px 12px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  background: color-mix(in srgb, var(--glass-strong) 82%, transparent);
  box-shadow: var(--shadow), var(--inner);
  backdrop-filter: blur(30px) saturate(1.45);
  -webkit-backdrop-filter: blur(30px) saturate(1.45);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-mark,
.card-icon {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  border: 1px solid var(--stroke);
  border-radius: 16px;
  background: linear-gradient(145deg, color-mix(in srgb, var(--accent) 22%, transparent), color-mix(in srgb, var(--glass) 75%, transparent));
  color: var(--accent);
  font-weight: 900;
  box-shadow: var(--inner);
}

.image-mark {
  overflow: hidden;
  padding: 4px;
  border-radius: 16px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.74), rgba(255, 255, 255, 0.22)),
    color-mix(in srgb, var(--accent) 16%, transparent);
}

.image-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(10, 20, 18, 0.16);
}

.brand strong,
.brand small {
  display: block;
  white-space: nowrap;
}

.brand strong {
  font-size: 17px;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.nav-links {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--soft) 60%, transparent);
}

.nav-links a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 700;
  transition: background 180ms ease, color 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  background: var(--glass);
  color: var(--text);
}

.theme-toggle {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 6px 14px 6px 7px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  background: var(--glass);
  color: var(--text);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--inner);
}

.toggle-track {
  position: relative;
  width: 62px;
  height: 36px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 18%, var(--glass));
  border: 1px solid var(--stroke);
}

.toggle-thumb {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(145deg, #fff, color-mix(in srgb, var(--accent-2) 30%, #fff));
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.18);
  transition: transform 260ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

html[data-theme="dark"] .toggle-thumb {
  transform: translateX(26px);
  background: linear-gradient(145deg, #1b2419, #b6d992);
}

.section-shell {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
}

.hero {
  min-height: calc(100dvh - 84px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.8fr);
  align-items: center;
  gap: clamp(34px, 6vw, 80px);
  padding: clamp(48px, 8vw, 96px) 0;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 24px;
  font-size: clamp(48px, 8vw, 92px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1.05;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 22px;
}

.hero-lead,
.download p,
.story p,
.feature-card p {
  color: var(--muted);
  font-size: clamp(17px, 2vw, 22px);
}

.hero-lead {
  max-width: 720px;
}

.hero-actions,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  font-weight: 900;
  box-shadow: var(--inner);
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button.primary {
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  color: color-mix(in srgb, #07100d 86%, var(--text));
  box-shadow: 0 18px 40px color-mix(in srgb, var(--accent) 26%, transparent);
}

.button.secondary {
  background: var(--glass);
  color: var(--text);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 34px;
}

.hero-stats span {
  padding: 12px 14px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  background: var(--glass);
  color: var(--muted);
  font-weight: 800;
  box-shadow: var(--inner);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
}

.hero-stats strong {
  color: var(--text);
}

.hero-device {
  position: relative;
  display: grid;
  place-items: center;
}

.device-glow {
  position: absolute;
  inset: 8% -8% 4%;
  z-index: -1;
  border-radius: 40%;
  background:
    radial-gradient(circle at 38% 18%, color-mix(in srgb, var(--accent-3) 52%, transparent), transparent 44%),
    radial-gradient(circle at 60% 70%, color-mix(in srgb, var(--accent) 40%, transparent), transparent 46%);
  filter: blur(48px);
  opacity: 0.65;
}

.phone-frame {
  width: min(390px, 84vw);
  aspect-ratio: 1080 / 2074;
  overflow: hidden;
  border: 1px solid var(--stroke-strong);
  border-radius: 44px;
  background: var(--glass-strong);
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.22), var(--inner);
}

.phone-frame img,
.screen-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.section-heading {
  margin-bottom: 28px;
}

.story,
.features,
.screens,
.download {
  padding: clamp(54px, 9vw, 108px) 0;
}

.glass-card {
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--glass-strong) 80%, transparent), color-mix(in srgb, var(--glass) 64%, transparent));
  box-shadow: var(--shadow), var(--inner);
  backdrop-filter: blur(30px) saturate(1.3);
  -webkit-backdrop-filter: blur(30px) saturate(1.3);
}

.story-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.8fr;
  gap: 18px;
}

.story-main {
  grid-row: span 2;
  padding: clamp(26px, 4vw, 46px);
}

.mini-card,
.feature-card {
  padding: 26px;
}

.mini-card .card-icon {
  margin-bottom: 18px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card p {
  margin-bottom: 0;
  font-size: 17px;
}

.screen-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  align-items: start;
}

.screen-card {
  position: relative;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--stroke);
  border-radius: 32px;
  background: var(--glass);
  box-shadow: var(--shadow), var(--inner);
}

.screen-card.large {
  grid-column: span 2;
  grid-row: span 2;
}

.screen-card img {
  aspect-ratio: 1080 / 2074;
}

.screen-card figcaption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 9px 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.38);
  color: white;
  font-size: 14px;
  font-weight: 900;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.download-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 26px;
  align-items: center;
  padding: clamp(28px, 5vw, 56px);
}

.download-panel p {
  max-width: 720px;
  margin-bottom: 0;
}

.site-footer {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  padding: 34px 0 48px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-weight: 700;
}

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    display: none;
  }

  .hero,
  .story-grid,
  .download-panel {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 54px;
  }

  .hero-device {
    order: -1;
  }

  .phone-frame {
    width: min(300px, 78vw);
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .screen-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 580px) {
  .site-header {
    top: 10px;
    width: min(calc(100% - 18px), var(--max));
    padding: 8px;
  }

  .brand small,
  .theme-text {
    display: none;
  }

  .theme-toggle {
    padding-right: 7px;
  }

  h1 {
    font-size: clamp(38px, 12vw, 54px);
  }

  .hero {
    gap: 30px;
    padding-top: 34px;
  }

  .hero-actions,
  .download-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .feature-grid,
  .screen-grid {
    grid-template-columns: 1fr;
  }

  .screen-card.large {
    grid-column: span 1;
    grid-row: span 1;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}