:root{--blue:#2468f2;--purple:#7048f7;--ink:#18223a;--muted:#70809d;--line:#e9edf6;--bg:#f5f8ff;--white:#fff;--shadow:0 24px 70px rgba(38,72,140,.13)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;background:#fff;-webkit-font-smoothing:antialiased}a{text-decoration:none;color:inherit}button{font:inherit}.container{width:min(1180px,calc(100% - 40px));margin:auto}.header{height:76px;position:fixed;z-index:20;top:0;left:0;right:0;background:rgba(255,255,255,.8);backdrop-filter:blur(18px);border-bottom:1px solid rgba(226,232,245,.7);transition:.25s}.header.scrolled{box-shadow:0 8px 30px rgba(31,52,105,.08)}.nav{height:100%;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:11px;font-size:23px;font-weight:800;letter-spacing:.5px}.brand img,.footer-brand img{width:42px;height:42px;border-radius:13px;object-fit:cover;box-shadow:0 8px 18px rgba(51,94,245,.24)}.nav-links{display:flex;align-items:center;gap:38px;font-size:15px}.nav-links>a{color:#506079;transition:.2s}.nav-links>a:hover,.nav-links>a.active{color:var(--blue)}.nav-download{padding:11px 20px;background:var(--blue);border-radius:12px;color:#fff!important;box-shadow:0 10px 24px rgba(36,104,242,.22)}.menu-btn{display:none;background:none;border:0;padding:8px}.menu-btn i{display:block;width:24px;height:2px;background:#1b2940;margin:5px;border-radius:2px}.hero{min-height:780px;padding:145px 0 80px;background:linear-gradient(145deg,#f7faff 0%,#f4f1ff 55%,#eef9ff 100%);overflow:hidden;position:relative}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:56px}.hero-orb{position:absolute;border-radius:50%;filter:blur(1px);opacity:.55}.orb-one{width:340px;height:340px;background:radial-gradient(circle,#b9caff,transparent 68%);right:2%;top:8%}.orb-two{width:270px;height:270px;background:radial-gradient(circle,#d8c3ff,transparent 68%);left:-6%;bottom:-8%}.eyebrow,.section-kicker{color:var(--blue);font-size:14px;font-weight:700;letter-spacing:2px}.eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.8);border:1px solid #e4eaff;padding:9px 14px;border-radius:99px;box-shadow:0 8px 24px rgba(62,92,160,.07)}.eyebrow span{width:7px;height:7px;border-radius:50%;background:#30c68c;box-shadow:0 0 0 5px rgba(48,198,140,.13)}h1{font-size:clamp(48px,5.2vw,72px);line-height:1.14;letter-spacing:-3px;margin:24px 0 22px}h1 em{font-style:normal;background:linear-gradient(110deg,var(--blue),var(--purple));background-clip:text;color:transparent}.hero-text{font-size:18px;line-height:1.9;color:#64738d;max-width:570px}.hero-actions{display:flex;gap:14px;margin-top:34px}.button{height:52px;border-radius:14px;border:0;display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:0 24px;font-weight:700;cursor:pointer;transition:.25s}.button svg{width:22px;height:22px;fill:currentColor}.button.primary{color:#fff;background:linear-gradient(135deg,#2468f2,#5a62f2);box-shadow:0 13px 28px rgba(45,99,238,.28)}.button.primary:hover{transform:translateY(-2px);box-shadow:0 17px 34px rgba(45,99,238,.34)}.button.secondary{background:#fff;color:#44516a;border:1px solid #e1e7f2}.release-note{font-size:13px;color:#8a96aa;margin:15px 2px}.phone-stage{min-height:540px;position:relative;display:flex;align-items:center;justify-content:center}.phone{width:286px;height:576px;background:#111827;border-radius:43px;padding:10px;box-shadow:0 40px 80px rgba(38,48,101,.28),inset 0 0 0 1px #43506c;transform:rotate(3deg);position:relative;z-index:2}.phone:before{content:"";position:absolute;top:18px;left:50%;transform:translateX(-50%);width:92px;height:25px;background:#111827;border-radius:20px;z-index:3}.phone-screen{height:100%;background:linear-gradient(#f8faff,#f2f5fb);border-radius:34px;overflow:hidden;padding:16px 15px;position:relative}.status{height:30px;display:flex;justify-content:space-between;font-size:10px;font-weight:700;padding:0 7px}.chat-head{display:flex;align-items:center;justify-content:space-between;background:#fff;margin:0 -15px;padding:11px 16px;border-bottom:1px solid #edf0f5}.chat-head .back{font-size:28px}.chat-head div{text-align:center}.chat-head b{display:block;font-size:13px}.chat-head small{color:#7c899d;font-size:9px}.chat-head small i{display:inline-block;width:5px;height:5px;background:#34c98b;border-radius:50%}.date{text-align:center;color:#a1aaba;font-size:9px;margin:18px}.bubble{max-width:78%;padding:11px 13px;font-size:11px;line-height:1.5;margin:10px 0;border-radius:14px}.received{background:#fff;border-bottom-left-radius:4px;box-shadow:0 4px 12px rgba(50,70,105,.06)}.sent{background:linear-gradient(135deg,#3975f4,#655cf1);color:#fff;margin-left:auto;border-bottom-right-radius:4px}.voice-row{display:flex;gap:6px;align-items:center}.mini-avatar,.avatar{display:grid;place-items:center;border-radius:50%;color:#fff}.mini-avatar{width:25px;height:25px;background:linear-gradient(135deg,#29bcd7,#5270ee);font-size:10px}.voice{width:114px;display:flex;justify-content:space-between}.typing{width:48px;background:#fff;border-radius:15px;padding:10px;display:flex;gap:3px}.typing span{width:5px;height:5px;border-radius:50%;background:#aeb7c7;animation:blink 1.2s infinite}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}@keyframes blink{50%{opacity:.25;transform:translateY(-2px)}}.composer{position:absolute;bottom:12px;left:12px;right:12px;display:flex;align-items:center;gap:8px}.composer div{flex:1;background:#fff;padding:11px;border-radius:13px;color:#b2bac7;font-size:10px}.composer button{border:0;background:#fff;width:32px;height:32px;border-radius:50%;color:#72819b}.composer .send{background:var(--blue);color:#fff}.float-card{position:absolute;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.9);border-radius:18px;padding:12px 15px;display:flex;align-items:center;gap:10px;box-shadow:var(--shadow);z-index:3}.float-card b,.float-card small{display:block}.float-card b{font-size:12px}.float-card small{font-size:9px;color:#8a96aa;margin-top:3px}.card-call{left:-10px;top:118px}.card-message{right:-20px;bottom:112px}.avatar{width:34px;height:34px}.avatar-blue{background:linear-gradient(135deg,#31bad0,#4568f5)}.online-dot{width:11px;height:11px;border-radius:50%;background:#31ca8d;box-shadow:0 0 0 6px #dff8ef}.section{padding:105px 0}.section-heading{text-align:center;max-width:680px;margin:0 auto 52px}.section-heading h2,.security-card h2{font-size:38px;line-height:1.3;margin:12px 0}.section-heading p,.security-card p{color:var(--muted);line-height:1.8}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.feature-card{padding:30px 26px;border:1px solid var(--line);border-radius:24px;background:#fff;transition:.3s}.feature-card:hover{transform:translateY(-7px);box-shadow:var(--shadow);border-color:transparent}.feature-icon,.platform-icon{display:grid;place-items:center}.feature-icon{width:52px;height:52px;border-radius:16px;margin-bottom:22px}.feature-icon svg{width:26px;height:26px;fill:#fff}.feature-icon.purple{background:linear-gradient(135deg,#8255ef,#6653ec)}.feature-icon.blue{background:linear-gradient(135deg,#25a9e8,#386cf2)}.feature-icon.green{background:linear-gradient(135deg,#2bc994,#28a775)}.feature-icon.orange{background:linear-gradient(135deg,#ffb348,#fb7c4e)}.feature-card h3{font-size:19px;margin:0 0 12px}.feature-card p{color:var(--muted);font-size:14px;line-height:1.8;margin:0}.security{background:var(--bg)}.security-card{padding:50px 58px;border-radius:30px;background:linear-gradient(120deg,#132b6a,#49399e);color:#fff;display:grid;grid-template-columns:auto 1fr auto;gap:28px;align-items:center;box-shadow:0 30px 70px rgba(31,49,110,.22)}.security-card .section-kicker{color:#9dc5ff}.security-card h2{margin:8px 0}.security-card p{color:#c9d4ed;margin:0;max-width:600px}.shield{width:76px;height:76px;border-radius:22px;display:grid;place-items:center;background:rgba(255,255,255,.12)}.shield svg{width:38px;fill:#fff}.security-points{display:flex;flex-direction:column;gap:10px}.security-points span{font-size:13px;background:rgba(255,255,255,.1);padding:9px 14px;border-radius:99px;white-space:nowrap}.download{background:linear-gradient(#fff,#f7f9ff)}.download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:950px;margin:auto}.download-card{position:relative;text-align:center;padding:38px 30px 30px;background:#fff;border:1px solid var(--line);border-radius:25px;box-shadow:0 16px 45px rgba(34,59,119,.07)}.download-card.recommended{border:2px solid #5a6cf0;transform:translateY(-10px)}.tag{position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,#316cf1,#7152ed);color:#fff;padding:6px 14px;border-radius:99px;font-size:11px}.platform-icon{width:62px;height:62px;border-radius:18px;margin:0 auto 20px;background:#eef2fb;font-size:30px}.platform-icon svg{width:31px;fill:currentColor}.platform-icon.android{background:#e7f8ee;color:#20a965}.platform-icon.ios{color:#202a3d}.platform-icon.web{background:#e9efff;color:#396ce8}.download-card h3{font-size:21px;margin:0 0 8px}.download-card p{color:var(--muted);font-size:13px;margin:0 0 24px}.button.full{width:100%;height:47px}.button.muted{background:#f0f3f8;color:#8994a8}footer{padding:34px 0;border-top:1px solid var(--line)}.footer-grid{display:flex;align-items:center;justify-content:space-between;gap:25px}.footer-brand{display:flex;align-items:center;gap:10px}.footer-brand img{width:38px;height:38px;border-radius:11px}.footer-brand b,.footer-brand span{display:block}.footer-brand span{font-size:11px;color:var(--muted)}.footer-links{display:flex;gap:24px;font-size:13px;color:#65738b}footer p{font-size:12px;color:#9aa4b5}.toast{position:fixed;z-index:50;left:50%;bottom:30px;transform:translate(-50%,30px);background:#1f2a40;color:#fff;padding:12px 20px;border-radius:10px;font-size:13px;opacity:0;pointer-events:none;transition:.25s}.toast.show{opacity:1;transform:translate(-50%,0)}.reveal{opacity:0;transform:translateY(20px);transition:.7s ease}.reveal.visible{opacity:1;transform:none}
@media(max-width:900px){.hero{padding-top:120px}.hero-grid{grid-template-columns:1fr;text-align:center}.hero-text{margin-left:auto;margin-right:auto}.hero-actions{justify-content:center}.phone-stage{margin-top:20px}.feature-grid{grid-template-columns:repeat(2,1fr)}.security-card{grid-template-columns:auto 1fr}.security-points{grid-column:1/-1;flex-direction:row;justify-content:center}.download-grid{gap:14px}.download-card{padding-left:18px;padding-right:18px}}
@media(max-width:650px){.container{width:min(100% - 28px,1180px)}.header{height:66px}.brand img{width:36px;height:36px}.menu-btn{display:block}.nav-links{display:none;position:absolute;top:66px;left:14px;right:14px;flex-direction:column;align-items:stretch;gap:0;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}.nav-links.open{display:flex}.nav-links a{padding:13px 15px}.nav-download{text-align:center;margin-top:5px}.hero{min-height:auto;padding:108px 0 65px}.hero-grid{gap:25px}h1{font-size:43px;letter-spacing:-2px}.hero-text{font-size:16px}.hero-actions{flex-direction:column}.hero-actions .button{width:100%}.phone-stage{transform:scale(.89);margin:-15px 0 -30px}.card-call{left:-4px}.card-message{right:-5px}.section{padding:75px 0}.section-heading{margin-bottom:34px}.section-heading h2,.security-card h2{font-size:29px}.feature-grid,.download-grid{grid-template-columns:1fr}.feature-card{padding:25px}.security-card{padding:34px 24px;text-align:center;display:block}.shield{margin:0 auto 20px}.security-points{margin-top:24px;flex-wrap:wrap;display:flex}.download-card.recommended{transform:none;order:-1}.footer-grid{flex-direction:column;text-align:center}.footer-links{flex-wrap:wrap;justify-content:center}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none;transition:none}}
.hero .reveal{opacity:1;transform:none}
.download-grid{grid-template-columns:repeat(2,1fr);max-width:650px}