:root {
  --bg: #f3f6ff;
  --bg-soft: #eef3ff;
  --text: #13233f;
  --muted: #4d5d7a;
  --brand: #4b35ff;
  --brand-2: #14a8e0;
  --accent: #f59f00;
  --card: #ffffff;
  --line: rgba(32, 41, 88, 0.14);
  --shadow: 0 22px 52px rgba(65, 52, 255, 0.16);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI Variable", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 2%, rgba(113, 85, 255, 0.2), transparent 28%),
    radial-gradient(circle at 93% 14%, rgba(20, 168, 224, 0.16), transparent 26%),
    radial-gradient(circle at 94% 96%, rgba(75, 53, 255, 0.12), transparent 28%),
    var(--bg);
  line-height: 1.65;
  position: relative;
}

.tech-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -2;
  background-image:
    linear-gradient(to right, rgba(32, 41, 88, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(32, 41, 88, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(circle at center, #000 44%, transparent 85%);
  mask-image: radial-gradient(circle at center, #000 44%, transparent 85%);
}

h1,
h2,
h3,
.brand span,
.kicker,
.btn,
.price,
.panel-eq {
  font-family: "Bahnschrift", "Trebuchet MS", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.container {
  width: min(1140px, calc(100% - 2.2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  background: rgba(245, 248, 255, 0.78);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.site-nav a {
  color: #4e5b78;
  font-weight: 500;
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  transition: width 0.24s ease;
}

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

.lang-switch {
  margin: 0;
  padding: 0.22rem;
  min-inline-size: 148px;
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.22rem;
  border: 1px solid rgba(19, 35, 63, 0.14);
  border-radius: 999px;
  background: #edf1ff;
}

.lang-btn {
  border: 0;
  border-radius: 999px;
  background: transparent;
  min-height: 42px;
  padding: 0.46rem 0.9rem;
  color: var(--muted);
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.lang-btn.active {
  color: #fff;
  background: linear-gradient(120deg, #4b35ff, #2d7eff);
  box-shadow: 0 8px 16px rgba(75, 53, 255, 0.34);
}

.lang-btn:hover:not(.active) {
  background: #e2eaf8;
}

.lang-btn:focus-visible {
  outline: 2px solid rgba(15, 61, 255, 0.45);
  outline-offset: 1px;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 0.3rem 0.55rem;
  font-size: 1.1rem;
}


.hero {
  padding: 2rem 0 3.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.2rem;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.86), rgba(239, 244, 255, 0.8));
  border: 1px solid rgba(32, 41, 88, 0.11);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 1.35rem;
  position: relative;
  overflow: hidden;
}

.hero-grid::before {
  content: "";
  position: absolute;
  inset: -15% -20% auto auto;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(107, 81, 255, 0.26), transparent 62%);
  pointer-events: none;
}

.kicker {
  margin: 0;
  color: var(--brand);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  font-size: 0.8rem;
}

h1 {
  margin: 0.55rem 0 1rem;
  font-size: clamp(2rem, 3.8vw, 3.6rem);
  line-height: 1.08;
  color: #13233f;
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  h1 {
    background: linear-gradient(120deg, #13233f 40%, #4b35ff 88%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.hero-desc {
  max-width: 58ch;
  color: var(--muted);
  margin: 0;
}

.hero-actions {
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.btn {
  border-radius: 999px;
  padding: 0.72rem 1.2rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary {
  color: #fff;
  background: linear-gradient(110deg, var(--brand), var(--brand-2));
  box-shadow: var(--shadow);
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--text);
  background: #fff;
}

.hero-metrics {
  margin-top: 1.2rem;
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.hero-metrics article {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.72rem;
  box-shadow: 0 8px 18px rgba(32, 41, 88, 0.07);
}

.hero-metrics strong {
  display: block;
  color: var(--brand);
  font-size: 1.22rem;
}

.hero-metrics span {
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-panel {
  background: linear-gradient(150deg, #ffffff, #eef2ff 56%, #dde8ff);
  border: 1px solid rgba(75, 53, 255, 0.2);
  border-radius: var(--radius);
  padding: 1.3rem;
  box-shadow: var(--shadow);
}

.hero-panel h2 {
  margin: 0;
  font-size: 1rem;
  color: var(--muted);
}

.hero-art {
  margin-top: 0.8rem;
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: auto;
  border-radius: 14px;
  border: 1px solid rgba(32, 41, 88, 0.14);
  background: #f7f9ff;
}

.panel-eq {
  margin: 0.5rem 0 1rem;
  font-size: 1.28rem;
  line-height: 1.28;
}

.hero-panel ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.panel-link {
  margin-top: 1rem;
  display: inline-block;
  color: var(--brand);
  font-weight: 700;
}

.section {
  padding: 4rem 0;
}

.section.alt {
  background: linear-gradient(180deg, rgba(237, 243, 255, 0.75), rgba(237, 243, 255, 0.42));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  margin-bottom: 1.4rem;
}

h2 {
  margin: 0.45rem 0 0;
  font-size: clamp(1.5rem, 2.6vw, 2.45rem);
  line-height: 1.2;
}

.card-grid {
  display: grid;
  gap: 1rem;
}

.card-grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card,
.feature-card,
.price-card,
.milestone,
.stack article,
.faq-item {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.95), rgba(246, 249, 255, 0.93));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: 0 10px 24px rgba(32, 41, 88, 0.07);
}

.card,
.feature-card,
.price-card,
.milestone,
.faq-item {
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover,
.feature-card:hover,
.price-card:hover,
.milestone:hover,
.faq-item:hover {
  transform: translateY(-2px);
  border-color: rgba(75, 53, 255, 0.26);
  box-shadow: 0 16px 28px rgba(75, 53, 255, 0.12);
}

.card p,
.feature-card p,
.milestone p,
.stack p {
  margin: 0.45rem 0 0;
  color: var(--muted);
}

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

.stack h3 {
  margin: 0;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.check {
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.58rem 1rem;
  font-weight: 500;
}

.check::before {
  content: "✓";
  margin-right: 0.55rem;
  color: var(--brand);
  font-weight: 700;
}

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

.price-card {
  position: relative;
}

.price-card .price {
  margin: 0.4rem 0 0.8rem;
  font-size: 2rem;
  color: var(--brand);
}

.price-card ul {
  margin: 0;
  padding-left: 1rem;
  color: var(--muted);
}

.price-card.featured {
  background: linear-gradient(170deg, #fff, #f2f5ff 70%, #e8f0ff);
  border-color: rgba(75, 53, 255, 0.24);
  box-shadow: var(--shadow);
}

.badge {
  position: absolute;
  top: -0.62rem;
  right: 1rem;
  background: var(--accent);
  color: #212121;
  border-radius: 999px;
  font-size: 0.73rem;
  padding: 0.2rem 0.52rem;
  font-weight: 700;
}

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

.milestone h3 {
  margin-top: 0;
  color: var(--brand);
}

.narrow {
  width: min(860px, calc(100% - 2rem));
}

.faq-list {
  display: grid;
  gap: 0.75rem;
}

.faq-item summary {
  font-weight: 700;
  cursor: pointer;
}

.faq-item p {
  color: var(--muted);
}

.site-footer {
  padding: 3.2rem 0 1.2rem;
  background: linear-gradient(140deg, #111f4f, #1f2f72);
  color: #eef5ff;
}

.footer-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.1rem;
}

.footer-wrap h2 {
  margin-top: 0;
}

.footer-links {
  margin: 0.7rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.footer-links a {
  color: #d3e1ff;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.footer-links a:hover {
  border-color: #d3e1ff;
}

.copyright {
  margin: 1.7rem auto 0;
  width: min(1140px, calc(100% - 2rem));
  display: flex;
  justify-content: space-between;
  color: #b8c8e5;
  font-size: 0.9rem;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(44px);
  opacity: 0.28;
  pointer-events: none;
  z-index: -1;
}

.orb-a {
  width: 240px;
  height: 240px;
  background: #4b35ff;
  top: 12%;
  right: -80px;
}

.orb-b {
  width: 210px;
  height: 210px;
  background: #14a8e0;
  bottom: 6%;
  left: -70px;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.48s ease, transform 0.48s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .site-header {
    background: rgba(245, 248, 255, 0.96);
  }
}

@supports not ((mask-image: radial-gradient(circle at center, #000 44%, transparent 85%)) or (-webkit-mask-image: radial-gradient(circle at center, #000 44%, transparent 85%))) {
  .tech-grid {
    -webkit-mask-image: none;
    mask-image: none;
    opacity: 0.25;
  }
}

@media (max-width: 1024px) {
  .hero-grid,
  .stack {
    grid-template-columns: 1fr;
  }

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

  .card-grid.three,
  .price-grid,
  .timeline {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 72px;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.22s ease, opacity 0.22s ease;
  }

  .site-nav.open {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }

  .lang-switch {
    margin-left: auto;
  }

  .hero,
  .section {
    padding: 3.2rem 0;
  }

  .hero-metrics,
  .card-grid.four,
  .card-grid.three,
  .check-grid,
  .price-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .footer-wrap,
  .copyright {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.7rem;
  }
}