:root {
  --beiwen-bg: #05070d;
  --beiwen-surface: rgba(255, 255, 255, 0.05);
  --beiwen-surface-strong: rgba(255, 255, 255, 0.09);
  --beiwen-border: rgba(255, 255, 255, 0.12);
  --beiwen-text-primary: #f8fbff;
  --beiwen-text-secondary: rgba(248, 251, 255, 0.72);
  --beiwen-accent: #69a7ff;
  --beiwen-accent-strong: #8fc1ff;
  --beiwen-glow: rgba(105, 167, 255, 0.26);
  --beiwen-warning: #ffcf5b;
  --beiwen-success: #5fe0a8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

html {
  scroll-behavior: smooth;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.text-gradient {
  background: linear-gradient(180deg, #ffffff 0%, rgba(255, 255, 255, 0.64) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.accent-gradient {
  background: linear-gradient(90deg, #69a7ff 0%, #5fe0a8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

body {
  background:
    radial-gradient(circle at top, rgba(105, 167, 255, 0.18), transparent 28%),
    radial-gradient(circle at 80% 0%, rgba(95, 224, 168, 0.12), transparent 22%),
    linear-gradient(180deg, #04060b 0%, #060913 100%);
  color: var(--beiwen-text-primary);
}

main {
  position: relative;
  z-index: 1;
}

a {
  color: inherit;
}

.page-backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 20% 20%, rgba(105, 167, 255, 0.14), transparent 26%),
    radial-gradient(circle at 80% 10%, rgba(95, 224, 168, 0.10), transparent 20%),
    radial-gradient(circle at 60% 80%, rgba(255, 207, 91, 0.08), transparent 24%);
  filter: blur(36px);
  opacity: 0.85;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: rgba(6, 9, 19, 0.74);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--beiwen-border);
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.32);
}

.brand-copy {
  display: grid;
  gap: 0.1rem;
}

.brand-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-subtitle {
  color: var(--beiwen-text-secondary);
  font-size: 0.88rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: var(--beiwen-text-secondary);
  font-size: 0.92rem;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.nav-links a:hover {
  color: var(--beiwen-text-primary);
}

.locale-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.25rem;
  border: 1px solid var(--beiwen-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
}

.lang-switch {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--beiwen-text-secondary);
  font: inherit;
  font-size: 0.86rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.lang-switch:hover,
.lang-switch.is-active {
  color: var(--beiwen-text-primary);
  background: rgba(255, 255, 255, 0.12);
}

.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5.5rem 1.5rem 3.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 2.5rem;
  align-items: center;
}

.hero-copy {
  display: grid;
  gap: 1rem;
}

.hero-kicker,
.section-kicker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  gap: 0.45rem;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--beiwen-border);
  color: var(--beiwen-warning);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.activity-banner {
  display: grid;
  gap: 0.45rem;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(105, 167, 255, 0.34);
  border-radius: 22px;
  background:
    linear-gradient(180deg, rgba(105, 167, 255, 0.16), rgba(105, 167, 255, 0.08)),
    rgba(255, 255, 255, 0.04);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.25);
}

.activity-banner__badge {
  color: var(--beiwen-success);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.activity-banner__title {
  font-size: 1.1rem;
  font-weight: 700;
}

.activity-banner__desc {
  color: var(--beiwen-text-secondary);
  font-size: 0.95rem;
}

.hero-title,
.section-title {
  font-size: clamp(2.5rem, 5vw, 4.75rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
  margin: 0;
}

.hero-subtitle,
.section-description {
  margin: 0;
  color: var(--beiwen-text-secondary);
  font-size: 1.08rem;
  line-height: 1.72;
  max-width: 42rem;
}

.hero-actions {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-top: 0.35rem;
}

.hero-actions-container {
  display: grid;
  gap: 0.8rem;
  justify-items: start;
}

.hero-actions-note {
  font-size: 0.88rem;
  color: var(--beiwen-warning);
  font-weight: 500;
  line-height: 1.4;
}

@media (max-width: 1080px) {
  .hero-actions-container {
    justify-items: center;
  }
  .hero-actions {
    justify-content: center;
  }
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border-radius: 999px;
  padding: 0.9rem 1.25rem;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: linear-gradient(180deg, #f8fbff 0%, #dce8ff 100%);
  color: #0b1220;
  box-shadow: 0 18px 40px rgba(105, 167, 255, 0.22);
}

.btn-secondary {
  color: var(--beiwen-text-primary);
  border: 1px solid var(--beiwen-border);
  background: rgba(255, 255, 255, 0.05);
}

.btn-primary:hover,
.btn-secondary:hover {
  transform: translateY(-1px);
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.hero-pills span {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--beiwen-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--beiwen-text-secondary);
  font-size: 0.86rem;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.device-stack {
  position: relative;
  width: min(520px, 100%);
  min-height: 520px;
}

.device-card {
  margin: 0;
  position: absolute;
  overflow: hidden;
  border-radius: 28px;
  border: 1px solid var(--beiwen-border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.34);
}

.device-card img {
  display: block;
  width: 100%;
  height: auto;
}

.device-card figcaption {
  padding: 0.9rem 1rem 1rem;
  color: var(--beiwen-text-secondary);
  font-size: 0.86rem;
  text-align: center;
}

.device-card-ios {
  width: 56%;
  left: 0;
  top: 0;
  transform: rotate(-6deg);
}

.device-card-android {
  width: 52%;
  right: 0;
  bottom: 0;
  transform: rotate(6deg);
}

.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 0;
}

.section-kicker {
  margin-bottom: 0.9rem;
}

.section-title {
  max-width: 42rem;
}

.section-description {
  margin-top: 0.9rem;
}

.platform-grid,
.feature-grid,
.gallery-rows {
  display: grid;
  gap: 1.1rem;
}

.platform-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1.5rem;
}

.platform-card,
.feature-card {
  padding: 1.3rem;
  border-radius: 24px;
  border: 1px solid var(--beiwen-border);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03)),
    rgba(255, 255, 255, 0.03);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.2);
}

.platform-topline {
  display: grid;
  gap: 0.7rem;
  margin-bottom: 0.85rem;
}

.platform-topline h3,
.feature-card h3 {
  margin: 0;
  font-size: 1.2rem;
}

.platform-badge {
  width: fit-content;
  display: inline-flex;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: rgba(105, 167, 255, 0.15);
  border: 1px solid rgba(105, 167, 255, 0.35);
  color: var(--beiwen-accent-strong);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.platform-list {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--beiwen-text-secondary);
  display: grid;
  gap: 0.45rem;
}

.shot-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 1.1rem;
}

.shot-grid figure,
.gallery-row {
  margin: 0;
}

.shot-grid figure {
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
}

.shot-grid img,
.gallery-row img {
  display: block;
  width: 100%;
  height: auto;
}

.shot-grid figcaption {
  padding: 0.65rem 0.8rem 0.8rem;
  color: var(--beiwen-text-secondary);
  font-size: 0.84rem;
  text-align: center;
}

.feature-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 1.5rem;
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: rgba(105, 167, 255, 0.16);
  border: 1px solid rgba(105, 167, 255, 0.26);
  color: var(--beiwen-accent-strong);
  font-weight: 800;
  margin-bottom: 0.9rem;
}

.feature-card p,
.platform-card p {
  margin: 0.7rem 0 0;
  color: var(--beiwen-text-secondary);
  line-height: 1.72;
}

.gallery-rows {
  margin-top: 1.5rem;
}

.gallery-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.gallery-row img {
  border-radius: 20px;
  border: 1px solid var(--beiwen-border);
  background: rgba(255, 255, 255, 0.03);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.22);
}

.footer {
  max-width: 1200px;
  margin: 4rem auto 0;
  padding: 2.5rem 1.5rem 3rem;
  border-top: 1px solid var(--beiwen-border);
  color: var(--beiwen-text-secondary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem 1.5rem;
  margin-bottom: 1rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--beiwen-text-secondary);
}

.footer-links a:hover {
  color: var(--beiwen-text-primary);
}

.footer-note {
  text-align: center;
  font-size: 0.92rem;
  line-height: 1.6;
}

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .device-stack {
    min-height: 460px;
  }

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

  .gallery-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 780px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
    gap: 0.75rem;
  }

  .hero {
    padding-top: 4rem;
  }

  .device-stack {
    min-height: 410px;
  }

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

@media (max-width: 560px) {
  .nav-links a {
    display: none;
  }

  .locale-switcher {
    width: 100%;
    justify-content: space-between;
  }

  .lang-switch {
    flex: 1 1 0;
    text-align: center;
  }

  .hero,
  .section,
  .footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero-title,
  .section-title {
    font-size: clamp(2.1rem, 12vw, 3rem);
  }

  .hero-subtitle,
  .section-description {
    font-size: 1rem;
  }

  .device-stack {
    min-height: 360px;
  }

  .device-card {
    width: 68%;
  }

  .device-card-ios {
    left: 0;
    top: 0;
  }

  .device-card-android {
    right: 0;
    bottom: 0;
  }
}