:root {
  --bg: #f5f8fc;
  --panel: rgba(255, 255, 255, 0.88);
  --panel-strong: #ffffff;
  --panel-soft: #eef4fb;
  --text: #1c2a3a;
  --muted: #61758d;
  --line: rgba(40, 71, 110, 0.12);
  --brand: #4f9bff;
  --brand-strong: #2f7df6;
  --brand-soft: rgba(47, 125, 246, 0.08);
  --accent: #28c7a8;
  --warning: #b8741a;
  --shadow: 0 18px 45px rgba(45, 77, 122, 0.12);
  --radius: 24px;
  --radius-sm: 16px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(79, 155, 255, 0.2), transparent 34%),
    radial-gradient(circle at 85% 10%, rgba(40, 199, 168, 0.1), transparent 26%),
    linear-gradient(180deg, #f8fbff 0%, #f5f8fc 42%, #eef4fb 100%);
  min-height: 100vh;
}

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

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

button,
a.button {
  font: inherit;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(248, 251, 255, 0.82);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 76px;
}

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

.brand-badge {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #50a8ff, #7cf3d1);
  color: #04111d;
  font-weight: 800;
  box-shadow: 0 12px 28px rgba(80, 168, 255, 0.28);
}

.brand-text strong,
.brand-text span {
  display: block;
}

.brand-text strong {
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.brand-text span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.88rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--muted);
  transition: color 0.2s ease;
}

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

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 0.95rem;
  white-space: nowrap;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease,
    background 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: #ffffff;
  box-shadow: 0 16px 36px rgba(47, 125, 246, 0.28);
}

.button-secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 36px;
  padding: 0 16px;
  border-radius: 999px;
  background: var(--brand-soft);
  border: 1px solid rgba(47, 125, 246, 0.16);
  color: var(--brand-strong);
  font-size: 0.9rem;
}

.page-hero,
.hero {
  padding: 72px 0 44px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}

.page-hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: center;
}

.hero-copy h1,
.page-hero-copy h1 {
  margin: 18px 0 16px;
  font-size: clamp(2.4rem, 5vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.hero-copy p,
.page-hero-copy p,
.section-copy p,
.card p,
.support-card p,
.timeline p,
.faq-list details p,
.step-item p {
  color: var(--muted);
  line-height: 1.75;
}

.hero-actions,
.page-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0 24px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.stat-card,
.card,
.support-card,
.download-card,
.screenshot-card,
.timeline,
.quote-card,
.faq-list details,
.step-item,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.stat-card {
  padding: 22px;
}

.stat-card strong {
  display: block;
  font-size: 1.6rem;
  margin-bottom: 10px;
}

.stat-card span {
  color: var(--muted);
  line-height: 1.6;
}

.visual-stack {
  display: grid;
  gap: 18px;
}

.visual-card {
  padding: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(240, 246, 253, 0.96));
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.product-chip-list,
.tag-list,
.mini-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.product-chip-list span,
.tag-list span,
.mini-points span {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(47, 125, 246, 0.08);
  color: #31567d;
  font-size: 0.92rem;
}

.product-showcase {
  display: grid;
  gap: 16px;
}

.showcase-item {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.showcase-item strong {
  font-size: 1rem;
}

.section {
  padding: 40px 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 28px;
}

.section-copy h2 {
  margin: 0 0 10px;
  font-size: clamp(1.9rem, 3vw, 3rem);
  line-height: 1.15;
}

.section-copy p {
  margin: 0;
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 18px;
}

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

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

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

.card {
  padding: 24px;
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.app-meta {
  display: flex;
  align-items: center;
  gap: 14px;
}

.app-icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  object-fit: cover;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.22);
}

.app-meta strong {
  display: block;
  font-size: 1.06rem;
}

.app-meta span,
.card small,
.muted {
  color: var(--muted);
}

.rating-pill,
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(40, 199, 168, 0.1);
  border: 1px solid rgba(40, 199, 168, 0.16);
  color: #157d69;
  font-size: 0.92rem;
  white-space: nowrap;
}

.card h3 {
  margin: 0 0 12px;
  font-size: 1.25rem;
}

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.text-link {
  color: var(--brand-strong);
  font-weight: 600;
}

.text-link:hover,
.text-link:focus-visible {
  color: #155ed3;
}

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

.support-card {
  padding: 22px;
}

.support-card strong {
  display: block;
  margin-bottom: 10px;
  font-size: 1rem;
}

.download-grid,
.screenshot-grid,
.step-grid {
  display: grid;
  gap: 18px;
}

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

.download-card {
  padding: 24px;
}

.download-card strong {
  display: block;
  margin-bottom: 10px;
  font-size: 1.15rem;
}

.download-card .button {
  margin-top: 14px;
}

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

.screenshot-card {
  overflow: hidden;
}

.screenshot-card img {
  width: 100%;
  height: 100%;
  min-height: 460px;
  object-fit: cover;
}

.two-column {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 18px;
}

.timeline {
  padding: 24px;
}

.timeline strong {
  display: block;
  margin-bottom: 10px;
  font-size: 1.08rem;
}

.faq-list {
  display: grid;
  gap: 16px;
}

.faq-list details {
  padding: 4px 22px;
}

.faq-list summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 0;
  font-weight: 700;
  position: relative;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 18px;
  font-size: 1.35rem;
  color: var(--brand);
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p,
.faq-list details ul {
  margin: 0 0 18px;
}

.faq-list ul,
.bullet-list {
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.75;
}

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

.step-item {
  padding: 22px;
}

.step-item strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 14px;
  border-radius: 12px;
  background: rgba(47, 125, 246, 0.1);
  color: var(--brand-strong);
}

.quote-card {
  padding: 28px;
}

.quote-card p {
  margin: 0;
  font-size: 1.06rem;
  line-height: 1.8;
}

.site-footer {
  margin-top: 52px;
  padding: 30px 0 44px;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}

.footer-grid p,
.footer-grid a {
  color: var(--muted);
}

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

.highlight {
  color: var(--brand-strong);
}

.hero-note {
  color: var(--warning);
  font-size: 0.95rem;
  margin-top: 16px;
}

.page-title-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.soft-panel {
  padding: 24px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(242, 247, 253, 0.94));
  border: 1px solid var(--line);
}

@media (max-width: 1100px) {
  .hero-grid,
  .page-hero-grid,
  .two-column {
    grid-template-columns: 1fr;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 820px) {
  .nav,
  .section-head,
  .footer-grid {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links,
  .nav-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .hero-stats,
  .grid-3,
  .grid-2,
  .grid-4,
  .pill-grid,
  .download-grid,
  .screenshot-grid,
  .step-grid {
    grid-template-columns: 1fr;
  }

  .hero,
  .page-hero {
    padding-top: 56px;
  }

  .app-meta {
    align-items: flex-start;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(var(--max-width), calc(100% - 20px));
  }

  .card,
  .support-card,
  .timeline,
  .quote-card,
  .download-card,
  .step-item,
  .visual-card,
  .soft-panel {
    padding: 20px;
  }

  .hero-copy h1,
  .page-hero-copy h1 {
    font-size: 2.35rem;
  }

  .screenshot-card img {
    min-height: 360px;
  }
}