:root {
  --bg: #f7f3e9;
  --bg-deep: #eef4ff;
  --card: rgba(255, 255, 255, 0.74);
  --card-strong: rgba(255, 255, 255, 0.92);
  --line: rgba(89, 112, 150, 0.14);
  --text: #1d2a3e;
  --muted: #627086;
  --accent: #1f7aff;
  --accent-warm: #ff9a62;
  --accent-soft: #ffd86f;
  --shadow: 0 30px 70px rgba(47, 68, 101, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 206, 133, 0.38), transparent 28%),
    radial-gradient(circle at top right, rgba(108, 171, 255, 0.26), transparent 24%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 48%, #ffffff 100%);
}

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

.site-shell {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 20px 0 42px;
}

.hero {
  position: relative;
  padding: 16px 0 28px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 30px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-logo {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: 0 16px 28px rgba(31, 122, 255, 0.18);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-copy strong {
  font-size: 20px;
}

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

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-link {
  font-size: 14px;
  color: var(--muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

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

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #62a8ff);
  box-shadow: 0 18px 32px rgba(31, 122, 255, 0.24);
}

.btn-secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
}

.btn-ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(107, 129, 163, 0.16);
}

.btn-ghost-light {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.22);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(460px, 0.97fr);
  gap: 28px;
  align-items: center;
}

.eyebrow,
.section-tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(107, 129, 163, 0.14);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #5f7697;
}

.hero-copy h1 {
  margin: 18px 0 14px;
  font-size: clamp(40px, 5vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.hero-lead {
  margin: 0;
  max-width: 620px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--muted);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0;
}

.hero-badges span {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(103, 127, 166, 0.14);
  font-size: 13px;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.hero-metrics article,
.stage-card,
.feature-card,
.showcase-panel,
.scene-card {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.hero-metrics article {
  padding: 18px;
  border-radius: 22px;
}

.hero-metrics strong {
  display: block;
  font-size: 28px;
  margin-bottom: 6px;
}

.hero-metrics span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.hero-stage {
  position: relative;
}

.stage-window {
  padding: 18px;
  border-radius: 34px;
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid rgba(121, 144, 181, 0.16);
  box-shadow: 0 32px 70px rgba(33, 58, 99, 0.16);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.window-topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red {
  background: #ff7d74;
}

.dot-yellow {
  background: #ffcc67;
}

.dot-green {
  background: #69d48d;
}

.window-title {
  margin-left: 8px;
  font-size: 12px;
  color: var(--muted);
}

.stage-content {
  display: grid;
  gap: 16px;
}

.stage-card {
  border-radius: 24px;
  padding: 18px;
}

.stage-card-main {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.95), rgba(237, 244, 255, 0.92));
}

.mini-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}

.mini-brand img {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  object-fit: cover;
}

.mini-brand strong {
  display: block;
  font-size: 16px;
  margin-bottom: 2px;
}

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

.flight-lane {
  position: relative;
  min-height: 128px;
  border-radius: 22px;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(232, 241, 255, 0.84), rgba(255, 255, 255, 0.92)),
    radial-gradient(circle at right, rgba(255, 214, 120, 0.26), transparent 35%);
}

.flight-bubble {
  position: absolute;
  top: 22px;
  left: 30px;
  padding: 12px 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(123, 145, 176, 0.15);
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 10px 22px rgba(61, 85, 123, 0.12);
}

.plane-wrap {
  position: absolute;
  left: -20px;
  right: -20px;
  top: 58px;
  height: 54px;
}

.plane {
  position: absolute;
  width: 54px;
  height: 22px;
  border-radius: 14px 16px 16px 14px;
  background: linear-gradient(135deg, #1f7aff, #68afff);
  animation: flyAcross 7.2s linear infinite;
  box-shadow: 0 14px 28px rgba(31, 122, 255, 0.25);
}

.plane::before,
.plane::after {
  content: "";
  position: absolute;
  background: var(--accent-warm);
}

.plane::before {
  width: 18px;
  height: 7px;
  left: 16px;
  top: -6px;
  border-radius: 8px 8px 0 0;
  transform: rotate(18deg);
}

.plane::after {
  width: 18px;
  height: 7px;
  left: 16px;
  bottom: -6px;
  border-radius: 0 0 8px 8px;
  transform: rotate(-18deg);
}

.trail {
  position: absolute;
  top: 12px;
  width: 220px;
  height: 2px;
  background: linear-gradient(90deg, rgba(31, 122, 255, 0), rgba(31, 122, 255, 0.55), rgba(255, 170, 93, 0.12));
  filter: blur(0.2px);
  animation: trailAcross 7.2s linear infinite;
}

.stage-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.stage-grid .stage-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
}

.stage-grid .stage-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.section {
  padding: 34px 0;
}

.section-head {
  max-width: 740px;
  margin-bottom: 24px;
}

.section-head h2 {
  margin: 14px 0 10px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 16px;
}

.feature-card {
  grid-column: span 4;
  padding: 20px;
  border-radius: 24px;
}

.feature-card-large {
  grid-column: span 8;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(244, 249, 255, 0.92));
}

.feature-index {
  display: inline-flex;
  margin-bottom: 18px;
  font-size: 12px;
  font-weight: 900;
  color: #7d8ca5;
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 22px;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.showcase-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(380px, 1.05fr);
  gap: 20px;
  align-items: stretch;
}

.showcase-panel {
  padding: 28px;
  border-radius: 28px;
}

.showcase-panel h2 {
  margin: 16px 0 12px;
  font-size: 40px;
  line-height: 1.1;
}

.showcase-panel p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.bullet-list {
  margin: 22px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.9;
}

.showcase-preview {
  border-radius: 32px;
  padding: 20px;
  background:
    linear-gradient(155deg, rgba(255, 255, 255, 0.94), rgba(241, 248, 255, 0.86)),
    radial-gradient(circle at top right, rgba(255, 209, 97, 0.28), transparent 32%);
  border: 1px solid rgba(102, 127, 168, 0.14);
  box-shadow: var(--shadow);
}

.preview-stack {
  display: grid;
  gap: 16px;
  height: 100%;
}

.preview-tile {
  padding: 24px;
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(113, 136, 170, 0.14);
}

.preview-tile span {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 13px;
}

.preview-tile strong {
  font-size: 26px;
  line-height: 1.3;
}

.preview-a {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.96), rgba(242, 248, 255, 0.92));
}

.preview-b {
  transform: translateX(32px);
}

.preview-c {
  transform: translateX(14px);
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.scene-card {
  padding: 22px;
  border-radius: 24px;
}

.scene-card strong {
  display: block;
  margin-bottom: 10px;
  font-size: 18px;
}

.scene-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.download-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 20px;
  padding: 28px;
  border-radius: 30px;
  background: linear-gradient(145deg, #163965, #235ea5 45%, #3f82d8 100%);
  color: #fff;
  box-shadow: 0 30px 60px rgba(22, 57, 101, 0.28);
}

.download-copy h2 {
  margin: 14px 0 12px;
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.08;
}

.download-copy p {
  margin: 0;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.download-meta {
  display: grid;
  gap: 12px;
}

.meta-item {
  padding: 18px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.meta-item span {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.72);
}

.meta-item strong {
  font-size: 18px;
  line-height: 1.5;
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 0 4px;
  color: var(--muted);
}

.footer strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

@keyframes flyAcross {
  0% {
    transform: translateX(0) translateY(4px);
  }
  50% {
    transform: translateX(78%) translateY(-4px);
  }
  100% {
    transform: translateX(158%) translateY(3px);
  }
}

@keyframes trailAcross {
  0% {
    transform: translateX(0);
    opacity: 0.25;
  }
  50% {
    transform: translateX(88%);
    opacity: 0.8;
  }
  100% {
    transform: translateX(168%);
    opacity: 0.18;
  }
}

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

  .feature-card,
  .feature-card-large {
    grid-column: span 12;
  }

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

  .hero-stage {
    order: -1;
  }
}

@media (max-width: 760px) {
  .site-shell {
    width: min(100% - 24px, 1220px);
    padding-top: 14px;
  }

  .topbar,
  .topbar-actions,
  .hero-actions,
  .footer {
    flex-direction: column;
    align-items: stretch;
  }

  .topbar-actions {
    gap: 10px;
  }

  .hero-metrics,
  .stage-grid,
  .scene-grid {
    grid-template-columns: 1fr;
  }

  .preview-b,
  .preview-c {
    transform: none;
  }

  .download-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-copy h1 {
    font-size: 38px;
  }

  .showcase-panel h2,
  .section-head h2 {
    font-size: 30px;
  }

  .brand-copy strong {
    font-size: 18px;
  }
}