:root {
  color-scheme: light;
  --color-bg: #ffffff;
  --color-bg-soft: #f7f7fb;
  --color-bg-accent: #f0f5ff;
  --color-primary: #6b66ff;
  --color-primary-dark: #514bff;
  --color-secondary: #00b3a4;
  --color-text: #1f2330;
  --color-muted: #5c6275;
  --color-border: #e2e4ee;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --shadow-lg: 0 40px 60px -40px rgba(40, 50, 120, 0.35);
  --shadow-md: 0 24px 40px -32px rgba(40, 50, 120, 0.3);
  --shadow-sm: 0 6px 18px rgba(50, 60, 140, 0.15);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

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

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

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: grid;
  place-items: center;
  font-size: 18px;
  color: #fff;
  font-weight: 600;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav ul {
  display: flex;
  list-style: none;
  gap: 24px;
  margin: 0;
  padding: 0;
}

.site-nav a {
  font-size: 15px;
  color: var(--color-muted);
  transition: color 0.2s ease;
}

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

.nav-toggle {
  display: none;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  padding: 8px 12px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 14px 24px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.cta:hover,
.cta:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 12px 30px -20px rgba(40, 50, 120, 0.6);
}

.cta-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid rgba(107, 102, 255, 0.4);
  box-shadow: none;
}

.cta-outline:hover,
.cta-outline:focus-visible {
  border-color: var(--color-primary);
  box-shadow: none;
}

.hero {
  padding: 120px 0 100px;
  background: radial-gradient(120% 100% at 50% 0%, #f0f5ff 0%, #ffffff 55%);
}

.hero-grid {
  display: grid;
  gap: 48px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
}

.hero-copy .eyebrow {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: 16px;
}

.hero-copy h1 {
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.2;
  margin: 0 0 18px;
}

.lead {
  font-size: 17px;
  color: var(--color-muted);
  margin-bottom: 28px;
}

.cta-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.hero-highlights strong {
  font-size: 26px;
  color: var(--color-primary);
}

.hero-visual {
  position: relative;
  display: grid;
  gap: 24px;
}

.glass-card {
  background: rgba(255, 255, 255, 0.82);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow-lg);
  padding: 28px;
  backdrop-filter: blur(18px);
}

.glass-card .label {
  font-size: 14px;
  color: var(--color-muted);
  letter-spacing: 0.05em;
}

.weight-card {
  align-self: start;
}

.weight-card .weight-value {
  display: block;
  font-size: 56px;
  font-weight: 600;
  margin: 12px 0 6px;
}

.weight-card .weight-value span {
  font-size: 20px;
  margin-left: 8px;
  color: var(--color-muted);
}

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

.caption.positive {
  color: var(--color-secondary);
}

.trend-chart {
  margin: 24px 0;
  height: 120px;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(107, 102, 255, 0.12), rgba(107, 102, 255, 0.03));
  position: relative;
  overflow: hidden;
}

.chart-line {
  position: absolute;
  inset: 20px 16px;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(107, 102, 255, 0.65), rgba(0, 179, 164, 0.45));
  mask-image: radial-gradient(circle at 10% 20%, rgba(0, 0, 0, 0.65) 0%, rgba(0, 0, 0, 0.1) 60%);
}

.ai-chip {
  font-size: 14px;
  color: var(--color-primary);
  background: rgba(107, 102, 255, 0.08);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}

.log-card {
  max-width: 320px;
  margin-left: auto;
  background: rgba(255, 255, 255, 0.9);
}

.log-card ul {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  display: grid;
  gap: 16px;
}

.log-card li {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  color: var(--color-muted);
}

.log-card span:first-child {
  font-weight: 600;
  color: var(--color-text);
}

.section {
  padding: 100px 0;
}

.section.section-light {
  background: var(--color-bg-soft);
}

.section h2 {
  font-size: clamp(28px, 3.2vw, 38px);
  margin-bottom: 18px;
}

.section-lead {
  font-size: 17px;
  color: var(--color-muted);
  max-width: 720px;
  margin-bottom: 48px;
}

.feature-grid,
.insight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.feature-card,
.insight-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 28px;
  border: 1px solid rgba(107, 102, 255, 0.08);
  box-shadow: var(--shadow-sm);
}

.icon-circle {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(107, 102, 255, 0.1);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  font-weight: 600;
  margin-bottom: 18px;
}

.split {
  display: grid;
  gap: 48px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: start;
}

.bullet-list {
  list-style: none;
  padding: 0;
  margin: 32px 0;
  display: grid;
  gap: 16px;
}

.bullet-list li {
  padding-left: 28px;
  position: relative;
  color: var(--color-muted);
}

.bullet-list li::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  position: absolute;
  left: 0;
  top: 9px;
}

.ai-preview {
  display: grid;
  gap: 16px;
  max-width: 360px;
  margin: 0 auto;
}

.chat-bubble {
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 15px;
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.chat-bubble.bot {
  border-top-left-radius: 6px;
  border: 1px solid rgba(107, 102, 255, 0.12);
}

.chat-bubble.user {
  border-top-right-radius: 6px;
  background: rgba(107, 102, 255, 0.08);
}

.chat-bubble .name {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.pricing-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(107, 102, 255, 0.08);
  max-width: 320px;
  margin: 0 auto;
}

.pricing-card .price {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 12px 0 24px;
}

.pricing-card .amount {
  font-size: 40px;
  font-weight: 700;
}

.pricing-card .unit {
  color: var(--color-muted);
  font-size: 15px;
}

.pricing-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: grid;
  gap: 12px;
  color: var(--color-muted);
}

.fine-print {
  font-size: 12px;
  color: var(--color-muted);
  margin-top: 12px;
}

.testimonial {
  display: grid;
  gap: 40px;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.testimonial blockquote {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 0 0 16px;
  font-style: italic;
  box-shadow: var(--shadow-sm);
}

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

.faq-item {
  border-radius: var(--radius-md);
  border: 1px solid rgba(107, 102, 255, 0.12);
  background: #fff;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  font-size: 16px;
  background: none;
  border: none;
  text-align: left;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::after {
  content: "+";
  font-weight: 600;
  color: var(--color-primary);
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 24px;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--color-muted);
}

.faq-answer.open {
  padding: 0 24px 20px;
}

.section-cta {
  background: linear-gradient(135deg, rgba(107, 102, 255, 0.14), rgba(0, 179, 164, 0.14));
}

.download-card {
  display: grid;
  gap: 32px;
  align-items: center;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.notify-form {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr auto;
  background: #fff;
  padding: 12px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

.notify-form input {
  border: none;
  padding: 0 18px;
  border-radius: 999px;
  font-size: 15px;
  outline: none;
}

.notify-form input::placeholder {
  color: #9aa2b6;
}

.notify-note {
  font-size: 14px;
  color: var(--color-secondary);
  margin: 0;
}

.site-footer {
  background: #0f1220;
  color: rgba(255, 255, 255, 0.82);
  padding: 64px 0 40px;
}

.site-footer .brand-mark {
  background: rgba(255, 255, 255, 0.15);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  margin-bottom: 36px;
}

.footer-copy {
  color: rgba(255, 255, 255, 0.64);
  font-size: 15px;
  margin: 16px 0 0;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 10px;
  font-size: 15px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.72);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: #fff;
}

.footer-note {
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
}

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

@media (max-width: 960px) {
  .hero {
    padding-top: 100px;
  }

  .notify-form {
    grid-template-columns: 1fr;
    border-radius: 28px;
    padding: 20px;
  }

  .notify-form .cta {
    width: 100%;
  }
}

@media (max-width: 768px) {
  .header-content {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
    position: relative;
  }

  .site-nav ul {
    position: absolute;
    top: 52px;
    left: 0;
    width: 100%;
    flex-direction: column;
    gap: 0;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s ease;
  }

  .site-nav ul.open {
    max-height: 320px;
  }

  .site-nav li a {
    display: block;
    padding: 14px 20px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-content > .cta-outline {
    margin-left: auto;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 84px 0 80px;
  }

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

  .hero-visual {
    transform: scale(0.96);
  }

  .feature-card,
  .insight-card {
    padding: 22px;
  }

  .pricing-card {
    width: 100%;
  }
}