:root{--bg:#f5f5f7;--bg-soft:#ffffff;--ink:#1d1d1f;--ink-strong:#101012;--text:#3a3a3c;--text-muted:#6e6e73;--accent:#0066cc;--accent-strong:#0055b3;--accent-soft:rgba(0,102,204,0.08);--line:rgba(29,29,31,0.08);--line-strong:rgba(29,29,31,0.14);--nav-blur:rgba(251,251,253,0.78);--radius:18px;--shadow-soft:0 8px 28px rgba(0,0,0,0.05);--font-sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;--ease-out:cubic-bezier(0.22,1,0.36,1);}*,*::before,*::after{box-sizing:border-box;}html{scroll-behavior:smooth;scroll-padding-top:76px;}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-sans);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;}img{max-width:100%;display:block;}a{color:var(--accent);text-decoration:none;}a:hover{text-decoration:underline;}h1,h2,h3{color:var(--ink);font-weight:600;line-height:1.25;margin:0 0 .5em;}p,ul,ol,dl{margin:0 0 1em;}:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:4px;}::selection{background:rgba(0,113,227,0.18);}.sr-only{position:absolute !important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}.skip-link{position:absolute;top:-64px;left:12px;z-index:2000;padding:10px 18px;background:var(--ink);color:#fff;border-radius:8px;font-weight:600;transition:top .18s ease;}.skip-link:focus{top:12px;color:#fff;text-decoration:none;}.scroll-progress{position:fixed;top:0;left:0;height:3px;width:100%;background:transparent;z-index:1200;pointer-events:none;}.scroll-progress::after{content:"";display:block;height:100%;width:var(--progress,0%);background:linear-gradient(90deg,var(--accent),#4f9bff);transition:width .08s linear;}.nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:var(--nav-blur);-webkit-backdrop-filter:saturate(180%) blur(16px);backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid rgba(255,255,255,0.55);box-shadow:inset 0 1px 0 var(--glass-hi),var(--glass-shadow);}.nav--solid{background:rgba(255,255,255,0.92);}@supports not (backdrop-filter:blur(0px)){.nav{background:rgba(255,255,255,0.96);box-shadow:0 10px 30px rgba(0,0,0,0.05);}.nav--solid{background:rgba(255,255,255,0.97);}}.nav-inner{max-width:1180px;margin:0 auto;padding:0 24px;height:58px;display:flex;align-items:center;gap:20px;}.nav-brand{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:20px;letter-spacing:.04em;color:var(--ink);}.nav-logo{width:22px;height:22px;border-radius:6px;object-fit:contain;flex:none;}.nav-brand:hover{text-decoration:none;color:var(--ink);}.nav-back{display:inline-flex;align-items:center;gap:6px;margin-left:auto;font-size:14px;font-weight:500;color:var(--text-muted);}.nav-back:hover{color:var(--accent);text-decoration:none;}.nav-links{display:flex;align-items:center;gap:4px;margin-left:8px;}.nav-links a{padding:8px 14px;border-radius:10px;font-size:15px;font-weight:500;color:var(--text);transition:color .15s,background .15s;}.nav-links a:hover{color:var(--accent);background:rgba(0,113,227,.06);text-decoration:none;}.nav-links a.active{color:var(--accent);background:rgba(0,113,227,.08);}.nav-toggle{display:none;margin-left:auto;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:var(--bg-soft);color:var(--ink);align-items:center;justify-content:center;cursor:pointer;}.lang{position:relative;margin-left:auto;}.lang-btn{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg-soft);color:var(--ink);font-size:14px;font-weight:500;cursor:pointer;}.lang-btn:hover{border-color:rgba(0,113,227,.4);}.lang-btn .chev{transition:transform .18s ease;}.lang-btn[aria-expanded="true"] .chev{transform:rotate(180deg);}.lang-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:150px;margin:0;padding:6px;list-style:none;background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-soft);display:none;}.lang.open .lang-menu{display:block;}.lang-menu [role="option"]{padding:9px 12px;border-radius:8px;font-size:14px;color:var(--text);cursor:pointer;}.lang-menu [role="option"]:hover,.lang-menu [role="option"].focused{background:rgba(0,113,227,.08);color:var(--accent);}.lang-menu [role="option"][aria-selected="true"]{color:var(--accent);font-weight:600;}.footer{margin-top:64px;padding:44px 24px 40px;background:rgba(0,0,0,0.028);border-top:1px solid var(--line);}.footer-inner{max-width:1180px;margin:0 auto;display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:22px 40px;}.footer-brand-block{display:flex;align-items:baseline;gap:10px;}.footer-brand{font-weight:700;font-size:20px;color:var(--ink);}.footer-copy{font-size:13px;color:var(--text-muted);}.footer-links{display:flex;align-items:center;gap:12px;font-size:14px;}.footer-links a{color:var(--text-muted);}.footer-links a:hover{color:var(--accent);}.footer-links-sep{color:var(--line);}.footer-contact{display:flex;flex-direction:column;gap:6px;}.footer-contact-label{font-size:13px;color:var(--text-muted);}.footer-contact-mail{display:inline-flex;align-items:center;gap:7px;color:var(--accent);font-weight:500;font-size:15px;}.footer-contact-mail .mail-arrow{transition:transform .18s ease;}.footer-contact-mail:hover .mail-arrow{transform:translateX(3px);}.to-top{position:fixed;right:22px;bottom:22px;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,0.88);color:var(--ink);box-shadow:var(--shadow-soft);cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transform:translateY(8px);transition:opacity .2s,transform .2s;}.to-top.show{opacity:1;pointer-events:auto;transform:translateY(0);}.to-top:hover{color:var(--accent);}.section{padding:96px 0 48px;}.section:first-of-type{padding-top:80px;}.container{max-width:960px;margin:0 auto;padding:0 28px;}.section-title{font-size:clamp(26px,4.2vw,34px);font-weight:700;letter-spacing:.01em;margin:0 0 18px;color:var(--ink-strong);}.section-text{font-size:17px;color:var(--text);max-width:680px;line-height:1.75;}.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s var(--ease-out) var(--d,0s),transform .8s var(--ease-out) var(--d,0s),filter .8s var(--ease-out) var(--d,0s);}.reveal.visible{opacity:1;transform:none;}.blur-reveal{filter:blur(10px);}.blur-reveal.visible{filter:none;}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto;}.reveal{opacity:1 !important;transform:none !important;transition:none !important;}.scroll-progress,.to-top{display:none;}}@media (max-width:640px){.nav-toggle{display:flex;}.nav-links{position:fixed;top:58px;left:12px;right:12px;flex-direction:column;align-items:stretch;gap:2px;margin:0;padding:10px;background:rgba(255,255,255,0.92);-webkit-backdrop-filter:saturate(160%) blur(14px);backdrop-filter:saturate(160%) blur(14px);border:1px solid rgba(255,255,255,0.6);border-radius:14px;box-shadow:inset 0 1px 0 var(--glass-hi),var(--glass-shadow);display:none;}.nav-links.open{display:flex;}.nav-links a{padding:12px 14px;font-size:16px;border-radius:10px;}.lang{margin-left:0;}.footer-inner{flex-direction:column;align-items:flex-start;}}body.lang-swapping{overflow:hidden;}body.lang-swapping::after{content:"";position:fixed;inset:0;z-index:1500;background:var(--bg);opacity:0;animation:lang-fade-in .18s ease-out forwards;pointer-events:none;}@keyframes lang-fade-in{to{opacity:1;}}@supports (padding:max(0px)){.nav-inner,.footer-inner,.container,.page{padding-left:max(24px,env(safe-area-inset-left));padding-right:max(24px,env(safe-area-inset-right));}.to-top{right:max(22px,env(safe-area-inset-right));bottom:max(22px,env(safe-area-inset-bottom));}}