/* Stripe-inspired design system for 微企云链 */
:root {
  --primary: #533afd;
  --primary-deep: #4434d4;
  --primary-press: #2e2b8c;
  --primary-soft: #665efd;
  --primary-subdued: #b9b9f9;
  --brand-dark: #1c1e54;
  --ink: #0d253d;
  --ink-secondary: #273951;
  --ink-mute: #64748d;
  --on-primary: #ffffff;
  --canvas: #ffffff;
  --canvas-soft: #f6f9fc;
  --canvas-cream: #f5e9d4;
  --hairline: #e3e8ee;
  --shadow-blue: #003770;
  --ruby: #ea2261;
  --magenta: #f96bee;
  --lemon: #9b6829;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;

  --shadow-1: rgba(0, 55, 112, 0.08) 0 1px 3px;
  --shadow-2: rgba(0, 55, 112, 0.08) 0 8px 24px, rgba(0, 55, 112, 0.04) 0 2px 6px;

  --font: Inter, "SF Pro Display", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --container: 1120px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-weight: 300;
  font-feature-settings: "ss01";
  line-height: 1.5;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.section-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.tabular {
  font-feature-settings: "tnum", "ss01";
  letter-spacing: -0.42px;
}

/* ——— Buttons ——— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0;
  border-radius: var(--radius-pill);
  padding: 12px 20px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn-sm {
  font-size: 14px;
  padding: 8px 16px;
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-deep);
  border-color: var(--primary-deep);
  color: var(--on-primary);
}

.btn-primary:active {
  background: var(--primary-press);
  border-color: var(--primary-press);
}

.btn-secondary {
  background: var(--canvas);
  color: var(--primary);
  border-color: var(--primary);
}

.btn-secondary:hover {
  background: var(--canvas-soft);
  color: var(--primary-deep);
}

/* ——— Nav ——— */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.navbar.is-scrolled {
  border-bottom-color: var(--hairline);
  box-shadow: var(--shadow-1);
  background: rgba(255, 255, 255, 0.96);
}

.nav-container {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 24px;
  min-height: 64px;
}

.logo-container {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-img {
  height: 48px;
  width: auto;
}

.nav-links {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 8px;
}

.nav-links li {
  margin: 0;
}

.nav-links a:not(.btn) {
  display: block;
  color: var(--ink-mute);
  font-size: 15px;
  font-weight: 400;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-links a:not(.btn):hover {
  color: var(--ink);
  background: var(--canvas-soft);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* ——— Hero ——— */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 96px;
  text-align: center;
  background: var(--canvas);
}

.hero-mesh {
  position: absolute;
  inset: 0 0 auto 0;
  height: 72%;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 60% at 10% 40%, rgba(245, 233, 212, 0.95) 0%, transparent 55%),
    radial-gradient(ellipse 70% 55% at 35% 20%, rgba(255, 186, 122, 0.55) 0%, transparent 50%),
    radial-gradient(ellipse 65% 50% at 55% 35%, rgba(185, 185, 249, 0.7) 0%, transparent 55%),
    radial-gradient(ellipse 70% 60% at 75% 25%, rgba(83, 58, 253, 0.45) 0%, transparent 50%),
    radial-gradient(ellipse 60% 50% at 92% 45%, rgba(234, 34, 97, 0.35) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 48% 70%, rgba(249, 107, 238, 0.22) 0%, transparent 55%),
    linear-gradient(180deg, #f8f4ef 0%, #f0e8ff 35%, #e8e4ff 55%, var(--canvas) 100%);
  animation: mesh-drift 18s ease-in-out infinite alternate;
}

.hero-mesh::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, var(--canvas) 100%);
  pointer-events: none;
}

@keyframes mesh-drift {
  0% { transform: scale(1) translate(0, 0); }
  100% { transform: scale(1.04) translate(-1.5%, 1%); }
}

.hero-content {
  max-width: 720px;
  margin: 0 auto;
  animation: hero-rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes hero-rise {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-brand {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary-deep);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -1.4px;
  color: var(--ink);
  margin-bottom: 20px;
}

.hero-lead {
  font-size: 17px;
  font-weight: 300;
  line-height: 1.55;
  color: var(--ink-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
}

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

/* ——— Sections ——— */
.section-eyebrow {
  text-align: center;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-deep);
  margin-bottom: 12px;
}

.section-eyebrow-light {
  color: var(--primary-subdued);
}

.section-title {
  text-align: center;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.8px;
  color: var(--ink);
  margin-bottom: 48px;
}

.section-title-light {
  color: var(--on-primary);
}

/* ——— Features ——— */
.features {
  padding: 96px 0;
  background: var(--canvas-soft);
}

.features-cream {
  background: var(--canvas-cream);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: left;
  box-shadow: var(--shadow-1);
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.feature-card-soft {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(6px);
}

.feature-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(83, 58, 253, 0.08);
  color: var(--primary);
  font-size: 18px;
  margin-bottom: 18px;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 400;
  letter-spacing: -0.2px;
  color: var(--ink);
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--ink-mute);
  font-size: 15px;
  line-height: 1.5;
  margin-bottom: 16px;
}

.feature-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 400;
  color: var(--primary);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.25s ease, transform 0.25s ease, color 0.2s ease;
}

.feature-card:hover .feature-link {
  opacity: 1;
  transform: translateX(0);
}

.feature-link i {
  font-size: 11px;
  transition: transform 0.2s ease;
}

.feature-link:hover {
  color: var(--primary-deep);
}

.feature-link:hover i {
  transform: translateX(3px);
}

.feature-card-soft p {
  margin-bottom: 0;
}

/* ——— Stats (dark band) ——— */
.stats {
  padding: 96px 0;
  background: var(--brand-dark);
  color: var(--on-primary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-item {
  text-align: left;
  padding: 8px 0;
}

.stat-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.08);
  color: var(--primary-subdued);
  font-size: 16px;
  margin-bottom: 16px;
}

.stat-item h3 {
  font-size: 20px;
  font-weight: 400;
  letter-spacing: -0.2px;
  margin-bottom: 8px;
  color: var(--on-primary);
}

.stat-item p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.5;
}

/* ——— Testimonials ——— */
.testimonials {
  padding: 96px 0;
  background: var(--canvas);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.testimonial-card {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.testimonial-card:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.testimonial-quote {
  font-size: 15px;
  font-style: normal;
  font-weight: 300;
  line-height: 1.6;
  color: var(--ink-secondary);
  flex: 1;
}

.testimonial-card footer {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 1px solid var(--hairline);
  padding-top: 16px;
}

.testimonial-card footer strong {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}

.testimonial-card footer span {
  font-size: 13px;
  color: var(--ink-mute);
}

/* ——— Partners ——— */
.partners {
  padding: 80px 0;
  background: var(--canvas-soft);
  text-align: center;
}

.partner-logos {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  align-items: center;
}

.partner-logo {
  height: 64px;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 400;
  color: var(--ink-mute);
  transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.partner-logo:hover {
  color: var(--ink);
  border-color: var(--primary-subdued);
  box-shadow: var(--shadow-1);
}

/* ——— CTA band ——— */
.cta-band {
  padding: 80px 0;
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
}

.cta-inner {
  text-align: center;
  max-width: 560px;
}

.cta-inner h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 300;
  letter-spacing: -0.64px;
  color: var(--ink);
  margin-bottom: 12px;
}

.cta-inner p {
  font-size: 16px;
  color: var(--ink-mute);
  margin-bottom: 28px;
}

/* ——— Footer ——— */
.footer {
  background: var(--canvas);
  color: var(--ink-mute);
  padding: 64px 24px 24px;
  border-top: 1px solid var(--hairline);
}

.footer-grid {
  max-width: var(--container);
  margin: 0 auto 40px;
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 32px;
}

.footer-column h3 {
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
}

.footer-column > p {
  font-size: 14px;
  line-height: 1.5;
  max-width: 220px;
}

.footer-column ul {
  list-style: none;
}

.footer-column ul li {
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.45;
}

.footer-column ul li a {
  color: var(--ink-mute);
  transition: color 0.2s ease;
}

.footer-column ul li a:hover {
  color: var(--primary);
}

.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  color: var(--ink-mute);
  font-size: 13px;
}

/* ——— Reveal on scroll ——— */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* ——— Responsive ——— */
@media (max-width: 1024px) {
  .features-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

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

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    box-shadow: var(--shadow-2);
    padding: 12px 16px 20px;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a:not(.btn) {
    padding: 12px 14px;
    border-radius: var(--radius-md);
  }

  .nav-links .btn {
    width: 100%;
    margin-top: 8px;
  }

  .hero {
    min-height: auto;
    padding: 120px 20px 72px;
  }

  .hero h1 {
    letter-spacing: -0.8px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .features,
  .stats,
  .testimonials,
  .partners,
  .cta-band {
    padding: 72px 0;
  }

  .section-title {
    margin-bottom: 36px;
  }

  .features-grid,
  .testimonials-grid,
  .stats-grid,
  .partner-logos,
  .footer-grid {
    grid-template-columns: 1fr;
  }

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

  .feature-link {
    opacity: 1;
    transform: none;
  }

  .stat-item {
    text-align: center;
  }

  .stat-icon {
    margin-left: auto;
    margin-right: auto;
  }
}