:root {
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: #172033;
  background: #f5f7fc;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: #f5f7fc; line-height: 1.7; }
a { color: inherit; }

.site-header {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between;
  gap: 28px; padding: 14px max(24px, calc((100vw - 1160px) / 2)); background: rgba(255,255,255,.92);
  border-bottom: 1px solid #e7eaf2; backdrop-filter: blur(16px);
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; white-space: nowrap; }
.brand img { border-radius: 12px; box-shadow: 0 8px 20px rgba(61,91,239,.2); }
.brand span, footer div span { display: flex; flex-direction: column; line-height: 1.25; }
.brand b { font-size: 16px; letter-spacing: .05em; }
.brand small, footer small { color: #7b8498; font-size: 11px; }
nav { display: flex; align-items: center; gap: 22px; }
nav a { color: #596276; font-size: 14px; text-decoration: none; }
nav a:hover { color: #3d5bef; }

main { overflow: hidden; }
.hero, .section { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.hero { display: grid; grid-template-columns: 1fr .9fr; align-items: center; gap: 64px; min-height: 680px; padding: 88px 0; }
.eyebrow { display: inline-block; color: #3d5bef; background: #e9edff; border-radius: 999px; padding: 6px 12px; font-size: 13px; font-weight: 700; letter-spacing: .08em; }
h1 { margin: 22px 0; font-size: clamp(42px, 5vw, 68px); line-height: 1.12; letter-spacing: -.04em; }
.hero-copy > p { max-width: 650px; color: #697287; font-size: 17px; }
.hero-actions { display: flex; gap: 12px; margin: 32px 0 18px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 46px; padding: 0 20px; border-radius: 12px; text-decoration: none; font-weight: 700; }
.button.primary { color: white; background: linear-gradient(135deg, #5b7ff5, #3d5bef); box-shadow: 0 12px 28px rgba(61,91,239,.24); }
.button.secondary { color: #344057; background: white; border: 1px solid #dfe3ed; }
.release-note { font-size: 12px !important; color: #8a93a6 !important; }

.board-preview { position: relative; padding: 18px; border: 1px solid rgba(255,255,255,.85); border-radius: 28px; background: rgba(255,255,255,.78); box-shadow: 0 30px 80px rgba(38,55,108,.18); transform: rotate(1deg); }
.board-preview::before { content: ""; position: absolute; inset: -80px; z-index: -1; background: radial-gradient(circle, rgba(91,127,245,.26), transparent 62%); }
.preview-top { display: flex; align-items: center; gap: 7px; padding: 4px 2px 16px; color: #626c82; font-size: 13px; }
.preview-top i { width: 8px; height: 8px; border-radius: 50%; background: #d9ddea; }
.preview-top i:first-child { background: #6f8df7; }
.preview-top span { margin-left: auto; }
.columns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.columns article { min-height: 250px; padding: 15px 10px; border-radius: 16px; background: #f4f6fb; }
.columns b { display: block; margin: 0 5px 14px; font-size: 12px; color: #505a70; }
.columns p { margin: 9px 0; padding: 12px 10px; border-radius: 10px; background: white; color: #5d667a; font-size: 11px; box-shadow: 0 5px 12px rgba(38,55,108,.06); }
.columns p.done { color: #698174; text-decoration: line-through; }

.section { padding: 90px 0; scroll-margin-top: 72px; }
.section-heading { display: flex; gap: 18px; align-items: flex-start; margin-bottom: 36px; }
.section-heading > span { display: grid; place-items: center; width: 38px; height: 38px; flex: 0 0 auto; border-radius: 10px; color: #3d5bef; background: #e9edff; font-size: 12px; font-weight: 800; }
h2 { margin: 0; font-size: clamp(30px, 3vw, 44px); line-height: 1.2; letter-spacing: -.03em; }
.section-heading p { margin: 8px 0 0; color: #747d91; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feature-grid article, .feedback-card, .legal article, .split-card { background: white; border: 1px solid #e5e8f1; box-shadow: 0 12px 40px rgba(38,55,108,.06); }
.feature-grid article { padding: 24px; border-radius: 18px; }
.feature-grid h3, .feedback-card h3, .legal h3 { margin: 0 0 10px; font-size: 17px; }
.feature-grid p, .feedback-card p { margin: 0; color: #6d768a; font-size: 14px; }

.split-card { display: grid; grid-template-columns: .85fr 1.15fr; gap: 70px; padding: 52px; border-radius: 28px; }
.split-card h2 { margin: 18px 0; }
.split-card > div:first-child p { color: #6d768a; }
.steps p { display: flex; gap: 14px; align-items: center; margin: 0 0 16px; color: #566075; }
.steps p b { display: grid; place-items: center; width: 30px; height: 30px; flex: 0 0 auto; border-radius: 50%; color: white; background: #4f6cf7; font-size: 13px; }
.steps .button { margin-top: 14px; }

.feedback-card { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; padding: 36px; border-radius: 22px; }
.feedback-card ul { margin: 12px 0 0; padding-left: 20px; color: #626c80; }
.text-link { display: inline-block; margin-top: 18px; color: #3d5bef; font-weight: 700; text-decoration: none; }

.legal article { padding: 42px; border-radius: 22px; }
.legal h3 { margin-top: 30px; }
.legal h3:first-child { margin-top: 0; }
.legal p { color: #5f687b; }
.legal a, footer a { color: #3d5bef; }
code { padding: 2px 7px; border-radius: 6px; background: #eef1fb; color: #314bcf; overflow-wrap: anywhere; }

footer { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 30px; padding: 34px max(24px, calc((100vw - 1160px) / 2)); background: #172033; color: #dce1ec; }
footer div { display: flex; align-items: center; gap: 10px; }
footer img { border-radius: 9px; }
footer p { margin: 0; font-size: 13px; }
footer a { color: #b9c6ff; }

@media (max-width: 900px) {
  nav { display: none; }
  .hero { grid-template-columns: 1fr; min-height: auto; gap: 52px; padding: 70px 0; }
  .board-preview { max-width: 620px; width: 100%; margin-inline: auto; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .split-card { grid-template-columns: 1fr; gap: 30px; padding: 34px; }
  footer { grid-template-columns: 1fr; gap: 14px; }
}

@media (max-width: 560px) {
  .site-header { padding: 12px 18px; }
  .hero, .section { width: min(100% - 28px, 1160px); }
  h1 { font-size: 40px; }
  .hero-actions { flex-direction: column; }
  .columns { gap: 6px; }
  .columns article { min-height: 210px; padding: 10px 5px; }
  .columns p { padding: 9px 6px; font-size: 10px; }
  .section { padding: 64px 0; }
  .feature-grid, .feedback-card { grid-template-columns: 1fr; }
  .feedback-card, .legal article { padding: 26px; }
  .split-card { padding: 26px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}