/* 基础 */
*{box-sizing:border-box;}
html,body{width:100%;height:100%;}
body{min-height:100vh;color:#fff;margin:0;background:#050403;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;overflow:hidden;-webkit-tap-highlight-color:transparent;}
/* 落地页 */
.landing-page{position:relative;width:100%;max-width:580px;height:100vh;height:100svh;height:100dvh;min-height:100svh;margin:0 auto;background:#080604;box-shadow:0 0 70px rgba(0,0,0,.78);overflow:hidden;isolation:isolate;}
.landing-page::after{position:absolute;right:0;bottom:0;left:0;height:34%;content:"";pointer-events:none;background:linear-gradient(180deg,rgba(0,0,0,0),rgba(0,0,0,.22) 28%,rgba(0,0,0,.62) 100%);z-index:1;}
.landing-picture{position:absolute;top:0;right:0;bottom:0;left:0;display:block;}
.landing-image{position:absolute;top:0;left:0;display:block;width:100%;height:100%;object-fit:cover;object-position:center top;border:0;user-select:none;-webkit-user-drag:none;}
.landing-header{position:absolute;top:calc(3% + env(safe-area-inset-top));right:4.8%;left:4.8%;display:flex;align-items:center;justify-content:space-between;gap:14px;z-index:3;}
.brand-block{display:flex;align-items:center;gap:9px;min-width:0;text-shadow:0 1px 1px rgba(0,0,0,.78),0 3px 10px rgba(0,0,0,.34);}
.brand-icon{display:block;flex-shrink:0;width:clamp(38px,9.2vw,52px);height:clamp(38px,9.2vw,52px);filter:drop-shadow(0 3px 8px rgba(0,0,0,.32)) saturate(1.06);}
.brand-copy{display:flex;flex-direction:column;gap:clamp(4px,.55svh,6px);white-space:nowrap;}
.brand-copy strong{font-size:clamp(20px,4.6vw,26px);font-weight:800;line-height:1;letter-spacing:-.45px;}
.brand-copy small{font-size:clamp(11px,2.45vw,14px);font-weight:500;line-height:1.15;letter-spacing:.15px;}
.download-button{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:clamp(110px,23%,124px);height:clamp(40px,4.6svh,44px);color:#ffd88e;cursor:pointer;font-size:clamp(16px,3.4vw,19px);font-weight:700;line-height:1;text-decoration:none;white-space:nowrap;letter-spacing:.75px;text-shadow:0 1px 2px rgba(59,31,7,.74);background:linear-gradient(180deg,rgba(48,32,17,.54),rgba(20,14,9,.66));border:1.5px solid rgba(255,207,111,.94);border-radius:999px;box-shadow:inset 0 1px 0 rgba(255,246,215,.13),inset 0 0 14px rgba(248,174,56,.05),0 4px 14px rgba(0,0,0,.22),0 0 12px rgba(248,181,74,.06);transition:opacity .16s,transform .16s;backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);}
.landing-actions{position:absolute;right:10.2%;bottom:calc(3.8% + env(safe-area-inset-bottom));left:10.2%;display:flex;flex-direction:column;gap:clamp(10px,1.25svh,14px);z-index:3;}
.landing-button{display:flex;align-items:center;justify-content:center;gap:14px;width:100%;height:clamp(56px,6.8svh,76px);color:#291504;cursor:pointer;font-size:clamp(22px,5.5vw,31px);font-weight:850;line-height:1;text-decoration:none;letter-spacing:1px;background:linear-gradient(180deg,#fff 0%,#f1dca7 100%),linear-gradient(105deg,#f8d192 0%,#edb868 52%,#c98d41 100%);background-blend-mode:multiply;border:2px solid #f4cf8f;border-radius:999px;box-shadow:inset 0 1px 3px rgba(255,255,255,.28),inset 0 -3px 8px rgba(91,45,8,.1),0 10px 26px rgba(0,0,0,.28);outline:none;transition:opacity .16s,transform .16s;}
.landing-button svg{width:clamp(30px,7.5vw,42px);height:clamp(30px,7.5vw,42px);fill:none;stroke:currentColor;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round;}
.download-button[aria-disabled="true"],.landing-button[aria-disabled="true"]{cursor:default;opacity:.58;}
.landing-status{position:absolute;top:50%;left:50%;width:max-content;max-width:calc(100% - 40px);color:#ffe0a8;font-size:13px;font-weight:600;line-height:1.5;text-align:center;white-space:normal;margin:0;padding:9px 14px;background:rgba(24,15,8,.82);border:1px solid rgba(255,210,137,.35);border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.28);backdrop-filter:blur(8px);pointer-events:none;transform:translate(-50%,-50%);z-index:4;}
.security-note{display:flex;align-items:center;justify-content:center;gap:13px;width:100%;height:clamp(52px,6.4svh,70px);color:#f4bd65;font-size:clamp(18px,4.5vw,25px);font-weight:750;line-height:1;letter-spacing:1px;background:rgba(25,19,14,.72);border:1px solid rgba(238,177,82,.68);border-radius:999px;box-shadow:inset 0 0 26px rgba(255,181,63,.04);backdrop-filter:blur(3px);}
.security-note svg{width:clamp(28px,7vw,40px);height:clamp(32px,8vw,44px);fill:none;stroke:currentColor;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round;}
.download-button:active,.landing-button:active{opacity:.9;transform:scale(.975);}
/* 异常页 */
.unavailable-page{display:flex;align-items:center;justify-content:center;width:100%;min-height:100vh;padding:24px;}
.unavailable-card{display:flex;flex-direction:column;align-items:center;gap:16px;width:100%;max-width:420px;text-align:center;padding:32px 24px;background:#15151d;border:1px solid #292936;border-radius:16px;}
.unavailable-card h1{font-size:22px;font-weight:600;margin:0;}
.unavailable-card p{color:#aaaab8;font-size:14px;line-height:1.7;margin:0 0 8px;}
.retry-button{display:inline-flex;align-items:center;justify-content:center;height:44px;color:#1e1309;font-size:15px;font-weight:750;text-decoration:none;padding:0 28px;background:linear-gradient(100deg,#ffe3a1,#d88c22);border:1px solid #ffe19a;border-radius:22px;}
/* 短屏适配 */
@media (max-height:700px){
    .landing-actions{bottom:calc(2% + env(safe-area-inset-bottom));gap:8px;}
    .landing-button{height:50px;}
    .security-note{height:46px;}
}