:root{--fy-bg: #ffffff;--fy-bg-secondary: #f5f5f4;--fy-text: #171717;--fy-text-secondary: #57534e;--fy-text-placeholder: #a8a29e;--fy-primary: #171717;--fy-primary-text: #ffffff;--fy-border: #e7e5e4;--fy-glow: rgba(23, 23, 23, .08);--fy-radius-lg: 24px;--fy-radius-md: 16px;--fy-shadow: 0 10px 30px rgba(0, 0, 0, .08)}@media (prefers-color-scheme: dark){:root{--fy-bg: #0a0a0a;--fy-bg-secondary: #1c1c1c;--fy-text: #fafafa;--fy-text-secondary: #d6d3d1;--fy-text-placeholder: #78716c;--fy-primary: #fafafa;--fy-primary-text: #171717;--fy-border: #2e2e2e;--fy-glow: rgba(250, 250, 250, .06);--fy-shadow: 0 10px 30px rgba(0, 0, 0, .4)}}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:PingFang SC,Microsoft YaHei,-apple-system,sans-serif;background:var(--fy-bg);color:var(--fy-text);line-height:1.7;-webkit-font-smoothing:antialiased}.logo{width:44px;height:44px;border-radius:12px;background:var(--fy-primary);color:var(--fy-primary-text);display:inline-flex;align-items:center;justify-content:center;font-size:22px;font-weight:600;flex-shrink:0}.nav{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;padding:16px 6vw;background:color-mix(in srgb,var(--fy-bg) 82%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--fy-border)}.nav-brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--fy-text)}.nav-name{font-size:20px;font-weight:600}.nav-links{display:flex;align-items:center;gap:28px}.nav-links a{color:var(--fy-text-secondary);text-decoration:none;font-size:15px;transition:color .2s ease}.nav-links a:hover{color:var(--fy-text)}.nav-cta{padding:8px 20px;border-radius:999px;background:var(--fy-primary);color:var(--fy-primary-text)!important;font-weight:600}.hero{position:relative;text-align:center;padding:14vh 6vw 16vh;overflow:hidden}.hero-glow{position:absolute;inset:-20% -10% auto;height:70%;background:radial-gradient(ellipse at center,var(--fy-glow),transparent 65%);pointer-events:none}.hero-title{font-size:clamp(40px,8vw,76px);line-height:1.2;font-weight:700;letter-spacing:.02em}.hero-sub{margin-top:20px;font-size:clamp(16px,2.4vw,20px);color:var(--fy-text-secondary)}.hero-actions{margin-top:40px;display:flex;justify-content:center;gap:16px;flex-wrap:wrap}.btn{display:inline-block;padding:14px 32px;border-radius:999px;font-size:16px;font-weight:600;text-decoration:none;transition:opacity .2s ease,transform .2s ease}.btn:hover{transform:translateY(-2px)}.btn-primary{background:var(--fy-primary);color:var(--fy-primary-text);box-shadow:var(--fy-shadow)}.btn-ghost{border:1px solid var(--fy-border);color:var(--fy-text)}.section{padding:96px 6vw;max-width:1080px;margin:0 auto}.section-title{font-size:clamp(26px,4vw,34px);font-weight:700;margin-bottom:40px}.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}.about-text{font-size:17px;color:var(--fy-text-secondary)}.about-text b{color:var(--fy-text)}.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.feature-card{background:var(--fy-bg-secondary);border-radius:var(--fy-radius-lg);padding:32px;transition:transform .25s ease,box-shadow .25s ease}.feature-card:hover{transform:translateY(-4px);box-shadow:var(--fy-shadow)}.feature-icon{font-size:34px}.feature-card h3{margin:14px 0 8px;font-size:20px}.feature-card p{color:var(--fy-text-secondary);font-size:15px}.vision-list{list-style:none;display:flex;flex-direction:column;gap:0}.vision-step{display:flex;align-items:flex-start;gap:20px;border-left:2px solid var(--fy-border);padding:24px 0 24px 28px;position:relative}.vision-step:before{content:"";position:absolute;left:-7px;top:34px;width:12px;height:12px;border-radius:50%;background:var(--fy-primary)}.vision-tag{flex-shrink:0;padding:4px 14px;border-radius:999px;background:var(--fy-bg-secondary);font-size:14px;font-weight:600;color:var(--fy-text-secondary)}.vision-step p{font-size:16px}.vision-quote{margin-top:40px;text-align:center;font-size:clamp(20px,3vw,26px);font-weight:600}.download-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.download-card{background:var(--fy-bg-secondary);border-radius:var(--fy-radius-lg);padding:40px 32px;text-align:center;text-decoration:none;color:var(--fy-text);transition:transform .25s ease,box-shadow .25s ease}.download-card:hover{transform:translateY(-4px);box-shadow:var(--fy-shadow)}.download-card h3{margin:12px 0 6px;font-size:20px}.download-card p{color:var(--fy-text-secondary);font-size:14px}.download-link{display:inline-block;margin-top:12px;font-size:14px;font-weight:600}.download-note{margin-top:24px;text-align:center;color:var(--fy-text-placeholder);font-size:14px}.qr-placeholder{width:140px;height:140px;margin:0 auto;border:2px dashed var(--fy-border);border-radius:var(--fy-radius-md);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:var(--fy-text-placeholder);font-size:14px}.qr-placeholder small{font-size:12px}.qr-img{width:140px;height:140px;border-radius:var(--fy-radius-md)}.footer{border-top:1px solid var(--fy-border);padding:40px 6vw 48px;text-align:center;color:var(--fy-text-secondary);font-size:14px}.footer-links{margin-top:8px}.footer-links a{color:var(--fy-text-secondary);text-decoration:none}.footer-links a:hover{color:var(--fy-text);text-decoration:underline}.footer-icp{margin-top:8px;font-size:12px;color:var(--fy-text-placeholder)}.footer-icp a{color:var(--fy-text-placeholder);text-decoration:none}.footer-icp a:hover{color:var(--fy-text-secondary);text-decoration:underline}.reveal{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}.reveal.is-visible{opacity:1;transform:none}@media (prefers-reduced-motion: reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}@media (max-width: 720px){.nav-links a:not(.nav-cta){display:none}.about-grid,.feature-grid,.download-grid{grid-template-columns:1fr}.section{padding:64px 6vw}}