:root {
  color-scheme: light;
  --ink: #29211e;
  --muted: #6f625e;
  --orange: #ee532d;
  --orange-dark: #be381b;
  --line: #eadbd3;
  --cream: #fff8f4;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.6; }
a { color: inherit; }
a:focus-visible { outline: 3px solid var(--orange-dark); outline-offset: 4px; }
.container { width: min(100% - 40px, 1160px); margin-inline: auto; }
.site-header { border-bottom: 1px solid #f4e9e4; background: #fff; }
.header-content { display: flex; align-items: center; justify-content: space-between; min-height: 82px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-size: 19px; font-weight: 750; white-space: nowrap; }
.brand img { display: block; border-radius: 11px; }
.header-link { color: var(--orange-dark); font-weight: 650; text-underline-offset: 5px; }
.hero { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(270px, .8fr); align-items: center; gap: clamp(36px, 6vw, 100px); padding-block: clamp(64px, 8vw, 118px); }
.eyebrow { margin: 0 0 15px; color: var(--orange-dark); font-size: 13px; font-weight: 760; letter-spacing: .1em; }
h1, h2, h3, p { overflow-wrap: break-word; }
h1 { margin: 0; font-size: clamp(42px, 5.3vw, 72px); line-height: 1.16; letter-spacing: -.045em; }
h2 { margin: 0; font-size: clamp(29px, 3vw, 42px); line-height: 1.24; letter-spacing: -.03em; }
.lead { max-width: 650px; margin: 28px 0 0; color: var(--muted); font-size: clamp(16px, 1.5vw, 19px); line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 12px 23px; border-radius: 13px; font-size: 15px; font-weight: 720; text-align: center; text-decoration: none; transition: background-color .15s ease, border-color .15s ease; }
.button-primary { background: var(--orange); color: #fff; }
.button-primary:hover { background: var(--orange-dark); }
.button-secondary { border: 1px solid var(--line); background: #fff; }
.button-secondary:hover { border-color: var(--orange); background: var(--cream); }
.platform-note { margin: 18px 0 0; color: #7e716d; font-size: 13px; }
.preview { margin: 0; justify-self: center; width: min(100%, 360px); text-align: center; }
.preview-frame { padding: 10px; overflow: hidden; border: 1px solid #e2d2c8; border-radius: 38px; background: #25211f; box-shadow: 0 28px 62px rgba(59, 39, 29, .18); }
.preview-frame img { display: block; width: 100%; height: auto; max-height: 660px; object-fit: cover; object-position: top; border-radius: 29px; }
.preview figcaption { margin-top: 16px; color: var(--muted); font-size: 13px; }
.features { padding-block: 82px 92px; background: var(--cream); }
.features h2 { max-width: 650px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 34px; }
.feature-card { min-height: 220px; padding: 27px; border: 1px solid #f2e2d9; border-radius: 20px; background: #fff; }
.feature-number { color: var(--orange); font-size: 14px; font-weight: 800; letter-spacing: .08em; }
.feature-card h3 { margin: 24px 0 8px; font-size: 21px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.8; }
.download-section { padding-block: 94px; }
.download-panel { display: flex; align-items: center; justify-content: space-between; gap: 44px; padding: clamp(26px, 4vw, 58px); border-radius: 28px; background: #29211e; color: #fff; }
.download-panel .eyebrow { color: #ffb69f; }
.download-panel p:not(.eyebrow) { max-width: 570px; margin: 20px 0 0; color: #eadcd5; }
.download-panel .operator { font-size: 14px; }
.download-panel .download-note { font-size: 13px; }
.download-actions { display: flex; flex-direction: column; align-items: stretch; gap: 14px; flex: 0 0 245px; }
.checksum-link { color: #fff; text-align: center; font-size: 13px; text-underline-offset: 4px; }
.download-divider { border-top: 1px solid #64544e; margin-block: 4px; }
.button-harmony { border: 1px solid #fff; background: #fff; color: var(--ink); }
.button-harmony:hover { background: var(--cream); }
.invite-note { color: #eadcd5; font-size: 12px; text-align: center; line-height: 1.5; }
.site-footer { border-top: 1px solid #eee5e0; }
.footer-content { display: flex; justify-content: space-between; gap: 24px; padding-block: 28px; color: var(--muted); font-size: 13px; }
.footer-content a { color: var(--orange-dark); }

@media (max-width: 800px) {
  .hero { grid-template-columns: 1fr; gap: 48px; padding-block: 62px 72px; }
  .hero-copy { max-width: 700px; }
  .preview { width: min(75%, 350px); }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 0; }
  .download-panel { flex-direction: column; align-items: stretch; }
  .download-actions { flex: none; }
}

@media (max-width: 520px) {
  .container { width: min(100% - 32px, 1160px); }
  .header-content { min-height: 70px; }
  .brand { font-size: 17px; }
  .brand img { width: 38px; height: 38px; }
  .header-link { font-size: 13px; }
  h1 { font-size: clamp(37px, 10vw, 52px); }
  .hero-actions { display: grid; }
  .preview { width: min(86%, 320px); }
  .features { padding-block: 64px; }
  .download-section { padding-block: 64px; }
  .footer-content { flex-direction: column; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}