@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700&display=swap");

:root {
  color-scheme: light;
  --anchor-offset: 112px;
  --bg: #f5f7fb;
  --bg-elevated: #ffffff;
  --bg-soft: #edf2ff;
  --text: #0f172a;
  --muted: #4b5565;
  --primary: #2563eb;
  --primary-strong: #1e40af;
  --accent: #3b82f6;
  --border: #dbe2ef;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.09);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --max-width: 1200px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #05070b;
  --bg-elevated: #0d1119;
  --bg-soft: #11192a;
  --text: #f2f5fb;
  --muted: #9ba7bf;
  --primary: #60a5fa;
  --primary-strong: #3b82f6;
  --accent: #7ab3ff;
  --border: #1d2738;
  --shadow: 0 16px 40px rgba(2, 6, 23, 0.55);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

[id] {
  scroll-margin-top: var(--anchor-offset);
}

body {
  margin: 0;
  font-family: "Manrope", "Noto Sans SC", "HarmonyOS Sans SC", "Microsoft YaHei",
    sans-serif;
  background: radial-gradient(circle at 18% -6%, rgba(37, 99, 235, 0.14), transparent 44%),
    radial-gradient(circle at 88% -4%, rgba(59, 130, 246, 0.09), transparent 36%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 94%, #fff 6%), var(--bg));
  color: var(--text);
  line-height: 1.6;
}

body.has-modal-open {
  overflow: hidden;
}

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

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

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 48px;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--primary), var(--primary-strong));
  color: #fff;
  font-size: 20px;
  box-shadow: var(--shadow);
}

.brand-text {
  font-size: 18px;
}

.brand-logo-crop {
  position: relative;
  width: 96px;
  height: 32px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.brand-logo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transform: none;
  pointer-events: none;
}

.brand-logo-light {
  opacity: 1;
}

.brand-logo-dark {
  opacity: 0;
}

:root[data-theme="dark"] .brand-logo-light {
  opacity: 0;
}

:root[data-theme="dark"] .brand-logo-dark {
  opacity: 1;
}

.site-nav {
  display: flex;
  gap: 16px;
  font-size: 14px;
  color: var(--muted);
}

.site-nav a {
  position: relative;
  padding: 7px 2px;
  font-weight: 500;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.25s ease;
}

.site-nav a:hover::after {
  width: 100%;
}

.site-nav a:hover {
  color: var(--text);
}

.controls {
  display: flex;
  gap: 12px;
}

.toggle {
  display: inline-flex;
  padding: 4px;
  gap: 4px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-elevated) 90%, transparent);
}

.toggle button {
  border: none;
  background: transparent;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.toggle button.is-active {
  background: color-mix(in srgb, var(--primary) 20%, var(--bg-elevated));
  color: var(--text);
  font-weight: 600;
}

.theme-switch {
  position: relative;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.theme-switch:hover {
  color: var(--text);
  border-color: color-mix(in srgb, var(--primary) 45%, var(--border));
  transform: translateY(-1px);
}

.theme-switch-icon {
  position: absolute;
  width: 18px;
  height: 18px;
  display: inline-flex;
  opacity: 0;
  transform: scale(0.65) rotate(-40deg);
  transition: opacity 0.28s ease, transform 0.28s ease;
}

.theme-switch-icon svg {
  width: 100%;
  height: 100%;
}

:root[data-theme="light"] .theme-switch-sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

:root[data-theme="dark"] .theme-switch-moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

main {
  display: flex;
  flex-direction: column;
  gap: 96px;
  padding: 0 48px 80px;
}

.hero {
  margin-top: 6px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
  align-items: center;
}

.hero-content h1 {
  font-size: clamp(32px, 4vw, 54px);
  margin: 12px 0 16px;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--muted);
  margin: 0 0 20px;
  max-width: 56ch;
}

.eyebrow {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--muted);
  margin: 0;
}

.cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn.primary {
  background: linear-gradient(145deg, var(--primary), var(--primary-strong));
  color: #fff;
  box-shadow: var(--shadow);
}

.btn.ghost {
  border-color: var(--border);
  color: var(--text);
  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
}

.btn:hover {
  transform: translateY(-2px);
}

.hero-meta {
  margin: 18px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.pill-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 18px 0 0;
}

.pill-list li {
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 12px;
  color: color-mix(in srgb, var(--text) 85%, var(--muted));
}

.hero-visual {
  position: relative;
  min-height: 420px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, color-mix(in srgb, var(--bg-elevated) 94%, transparent), var(--bg-soft));
  padding: 32px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.hero-glow {
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle at 30% 40%, rgba(37, 99, 235, 0.24), transparent 52%),
    radial-gradient(circle at 70% 30%, rgba(59, 130, 246, 0.18), transparent 56%);
  z-index: 0;
}

.constellation {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.star {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #fcd34d;
  box-shadow: 0 0 12px rgba(252, 211, 77, 0.7);
}

.star-1 {
  top: 18%;
  left: 20%;
}

.star-2 {
  top: 28%;
  right: 24%;
}

.star-3 {
  top: 52%;
  left: 30%;
}

.star-4 {
  top: 65%;
  right: 30%;
}

.star-5 {
  bottom: 18%;
  left: 18%;
}

.star-6 {
  bottom: 24%;
  right: 18%;
}

.fairy {
  position: absolute;
  width: 200px;
  height: 200px;
  right: 32px;
  top: 40px;
  z-index: 2;
  filter: drop-shadow(0 12px 20px rgba(15, 23, 42, 0.25));
}

.hero-card {
  position: absolute;
  left: 32px;
  bottom: 32px;
  z-index: 2;
  background: color-mix(in srgb, var(--bg-elevated) 95%, transparent);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  width: min(240px, 80%);
  border: 1px solid var(--border);
}

.hero-card-title {
  margin: 0 0 10px;
  font-weight: 600;
}

.hero-card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.hero-card-tags span {
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 8px;
  background: var(--bg-soft);
}

.hero-card-desc {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.section {
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.screens-section {
  margin-top: -12px;
}

.wechat-section {
  margin-top: -12px;
}

.wechat-card {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 24px;
  padding: 28px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(140deg, color-mix(in srgb, var(--primary) 12%, transparent), var(--bg-elevated));
  box-shadow: var(--shadow);
  align-items: center;
}

.wechat-content h2 {
  margin: 10px 0 8px;
}

.wechat-content p {
  margin: 0;
  color: var(--muted);
}

.wechat-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}

.wechat-name {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-weight: 600;
}

.wechat-tip {
  color: var(--muted);
  font-size: 14px;
}

.wechat-qr {
  display: grid;
  place-items: center;
  gap: 10px;
}

.wechat-qr-img {
  width: 160px;
  height: 160px;
  border-radius: 16px;
  object-fit: cover;
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  box-shadow: var(--shadow);
}

.wechat-qr-caption {
  font-size: 12px;
  color: var(--muted);
}

.section-head h2 {
  margin: 8px 0 12px;
  font-size: clamp(24px, 3vw, 34px);
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 720px;
}

.core-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.core-card p {
  margin: 0;
  color: var(--muted);
}

.core-card,
.sync-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: 22px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.core-card h3,
.sync-card h3 {
  margin: 0 0 12px;
  font-size: 16px;
}

.core-card {
  position: relative;
}

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 0;
  margin: 0;
  counter-reset: step;
}

.steps li {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  position: relative;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: -16px;
  left: 18px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
}

.accent {
  background: linear-gradient(140deg, color-mix(in srgb, var(--bg-elevated) 88%, transparent), var(--bg-soft));
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
}

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

.screens-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.screen-card {
  background: color-mix(in srgb, var(--bg-elevated) 97%, transparent);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
}

.screen-card:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--primary) 70%, transparent);
  outline-offset: 2px;
}

.screen-media {
  position: relative;
  height: 220px;
  overflow: hidden;
  background: linear-gradient(160deg, color-mix(in srgb, var(--primary) 22%, transparent), var(--bg-soft));
}

.screen-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.screen-card:hover .screen-media img {
  transform: scale(1.02);
}

.screen-badge {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  background: color-mix(in srgb, var(--bg-elevated) 86%, transparent);
  border: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
  backdrop-filter: blur(6px);
}

.screen-card figcaption {
  padding: 16px;
}

.screen-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.screen-card p {
  margin: 0;
  color: var(--muted);
}

.image-modal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.image-modal.is-open {
  opacity: 1;
  pointer-events: auto;
}

.image-modal-backdrop {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, #020617 78%, transparent);
  backdrop-filter: blur(6px);
}

.image-modal-dialog {
  position: relative;
  z-index: 1;
  width: min(1040px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  padding: 16px;
  border-radius: var(--radius-lg);
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: color-mix(in srgb, var(--bg-elevated) 96%, transparent);
  box-shadow: 0 20px 70px rgba(2, 6, 23, 0.45);
  display: grid;
  gap: 10px;
  transform: translateY(14px) scale(0.96);
  transition: transform 0.28s ease;
}

.image-modal.is-open .image-modal-dialog {
  transform: translateY(0) scale(1);
}

.image-modal-image {
  width: 100%;
  max-height: calc(100vh - 132px);
  object-fit: contain;
  border-radius: 12px;
  background: #0b1020;
}

.image-modal-caption {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}

.image-modal-close {
  justify-self: end;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
}

.install-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
}

.install-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.install-steps li {
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.install-panel {
  padding: 20px;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  display: grid;
  gap: 10px;
  align-content: start;
}

.install-panel code {
  padding: 8px 10px;
  background: var(--bg-soft);
  border-radius: 8px;
  display: inline-block;
}

.install-note {
  color: var(--muted);
  font-size: 13px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 14px 18px;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 600;
}

.faq-list p {
  color: var(--muted);
  margin: 12px 0 0;
}

.cta-section {
  padding-top: 12px;
}

.cta-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 28px 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(140deg, var(--bg-elevated), color-mix(in srgb, var(--primary) 18%, transparent));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.cta-card h2 {
  margin: 0 0 8px;
}

.site-footer {
  padding: 32px 48px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

.brand-mini {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.footer-links {
  display: flex;
  gap: 18px;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-item {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--delay, 0s);
}

[data-reveal].is-visible .reveal-item {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .site-header {
    padding: 20px 28px;
    flex-wrap: wrap;
    gap: 12px;
  }

  main {
    padding: 0 28px 80px;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .core-grid,
  .steps,
  .sync-grid,
  .screens-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .install-grid {
    grid-template-columns: 1fr;
  }

  .wechat-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  :root {
    --anchor-offset: 24px;
  }

  .site-header {
    position: static;
  }

  .site-nav {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .controls {
    width: 100%;
    justify-content: flex-start;
  }

  .theme-switch {
    width: 38px;
    height: 38px;
  }

  .core-grid,
  .steps,
  .sync-grid,
  .screens-grid {
    grid-template-columns: 1fr;
  }

  .cta-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .image-modal-dialog {
    width: calc(100vw - 20px);
    max-height: calc(100vh - 20px);
    padding: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto;
  }

  [data-reveal],
  .reveal-item {
    opacity: 1;
    transform: none;
    transition: none;
  }
}