:root{color:#f7fbff;font-family:Microsoft YaHei UI,PingFang SC,Noto Sans SC,system-ui,sans-serif;background:#031028;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;-webkit-font-smoothing:antialiased;overflow-x:hidden}#root{min-height:100vh}button,a{font:inherit}.download-portal{min-height:100svh;position:relative;display:grid;place-items:center;overflow:hidden;isolation:isolate;padding:clamp(28px,4vh,56px) 20px clamp(48px,6vh,72px);background:#031028}.scene,.scene-shade{position:absolute;top:0;right:0;bottom:0;left:0;z-index:-2}.scene{background-image:var(--scene-image);background-position:center;background-repeat:no-repeat;background-size:cover;transform:scale(1.015);animation:scene-enter .7s ease-out both}.scene-shade{z-index:-1;background:#000c2247}.portal-content{width:min(100%,680px);display:flex;flex-direction:column;align-items:center;text-align:center;transform:translateY(clamp(-8px,-1vh,-2px))}.product-switcher{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:min(100%,390px);min-height:58px;padding:4px;border:1px solid rgba(118,177,255,.72);border-radius:999px;background:#02102dc2;box-shadow:0 0 22px #3079ff38,inset 0 0 20px #0a2d609e;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.product-switcher__option{min-height:48px;padding:8px 20px;border:0;border-radius:999px;color:#eaf3ffc2;background:transparent;cursor:pointer;font-size:clamp(17px,1.45vw,22px);font-weight:700;letter-spacing:.035em;transition:color .18s ease,background-color .18s ease,box-shadow .18s ease}.product-switcher__option:hover{color:#fff;background:#1c53aa47}.product-switcher__option[aria-pressed=true]{color:#fff;background:#1267f3;box-shadow:0 0 0 1px #9dd9ff,0 0 24px #2c7bffeb,inset 0 0 18px #55dfff73}.product-switcher__option:focus-visible,.download-button:focus-visible{outline:3px solid #ffffff;outline-offset:4px}.brand-block{display:flex;flex-direction:column;align-items:center;animation:content-enter .38s ease-out both}.brand-logo{width:clamp(174px,18vw,252px);height:clamp(174px,18vw,252px);margin-top:clamp(14px,2.1vh,24px);object-fit:contain;filter:drop-shadow(0 0 22px rgba(51,137,255,.68))}.download-portal[data-product=tiance] .brand-logo{width:clamp(162px,16.5vw,226px);height:clamp(162px,16.5vw,226px);margin-top:clamp(22px,3vh,34px);margin-bottom:clamp(2px,1vh,12px)}h1{margin:clamp(0px,.2vh,4px) 0 0;color:#fff;font-size:clamp(48px,5.8vw,84px);font-weight:900;line-height:1.05;letter-spacing:.075em;text-indent:.075em;text-shadow:0 4px 0 rgba(140,175,219,.38),0 0 28px rgba(30,112,255,.72)}.tagline{margin:clamp(8px,1.2vh,14px) 0 0;font-size:clamp(20px,2.05vw,30px);font-weight:650;letter-spacing:.06em;text-shadow:0 2px 12px rgba(0,13,38,.9)}.version-line{margin:clamp(8px,1.2vh,14px) 0 0;color:#e5f0ffe6;font-size:clamp(14px,1.25vw,18px);letter-spacing:.025em;text-shadow:0 2px 8px #00102d}.download-button{width:min(100%,410px);min-height:clamp(66px,8vh,82px);margin-top:clamp(20px,2.6vh,30px);display:inline-flex;align-items:center;justify-content:center;gap:22px;border:2px solid rgba(198,236,255,.95);border-radius:999px;color:#fff;background:#0b64f4;box-shadow:0 0 28px #2180fff5,inset 0 0 22px #57dbff73;text-decoration:none;font-size:clamp(22px,2vw,30px);font-weight:850;letter-spacing:.08em;transition:transform .18s ease,background-color .18s ease,box-shadow .18s ease}.download-button svg{font-size:1.35em}.download-button:hover:not([aria-disabled=true]){transform:translateY(-2px);background:#1976ff;box-shadow:0 0 38px #3397ff,inset 0 0 22px #6ee4ff8a}.download-button:active:not([aria-disabled=true]){transform:translateY(1px)}.download-button[aria-disabled=true]{cursor:not-allowed;opacity:.72}.trust-line{display:flex;align-items:center;gap:10px;margin:clamp(12px,1.6vh,18px) 0 0;color:#e2efffe6;font-size:clamp(13px,1.1vw,16px);letter-spacing:.025em;text-shadow:0 2px 8px #00102d}.trust-line svg{color:#bcecff}.portal-footer{position:absolute;bottom:clamp(18px,2.8vh,34px);left:50%;transform:translate(-50%);color:#dceafcd1;font-size:clamp(12px,1vw,15px);letter-spacing:.06em;white-space:nowrap;text-shadow:0 2px 8px #00102d}@keyframes scene-enter{0%{opacity:.42;transform:scale(1.035)}to{opacity:1;transform:scale(1.015)}}@keyframes content-enter{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media(max-height:780px)and (min-width:700px){.download-portal{padding-top:18px;padding-bottom:38px}.product-switcher{min-height:52px}.product-switcher__option{min-height:42px}.brand-logo{width:164px;height:164px;margin-top:10px}.download-portal[data-product=tiance] .brand-logo{width:150px;height:150px;margin-top:14px;margin-bottom:2px}h1{font-size:58px}.tagline{margin-top:6px;font-size:22px}.version-line{margin-top:7px}.download-button{min-height:64px;margin-top:16px}.trust-line{margin-top:10px}}@media(max-width:640px){.download-portal{min-height:100dvh;padding-inline:18px}.scene{background-position:center}.product-switcher{width:min(100%,338px)}.product-switcher__option{padding-inline:12px}.brand-logo{width:min(49vw,196px);height:min(49vw,196px)}.download-portal[data-product=tiance] .brand-logo{width:min(44vw,178px);height:min(44vw,178px)}h1{font-size:clamp(44px,15vw,62px)}.tagline{font-size:clamp(18px,5.6vw,23px)}.download-button{width:min(100%,360px);gap:16px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}