:root{
    --sky1:#BFE3FF; --sky2:#EAF7FF; --ink:#2D3E50; --sub:#6B7C8F;
    --blue:#4A90D9; --blue-d:#2F6FB3; --coral:#FF8A65; --sun:#FFC93C;
    --mint:#4ECDC4; --purple:#9B6FE8; --pink:#F78FB3;
    --card:#FFFFFF; --line:#DCEBF8;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
    font-family:"Microsoft YaHei",sans-serif;
    color:var(--ink); background:linear-gradient(180deg,var(--sky1) 0%,var(--sky2) 46%,#FDFDFB 100%);
    min-height:100vh; overflow-x:hidden;
}
.wrap{max-width:1060px;margin:0 auto;padding:0 20px;position:relative;z-index:2}

/* ===== 顶部天空装饰 ===== */
.sky{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.sun{position:absolute;top:34px;right:7%;width:74px;height:74px;border-radius:50%;
    background:radial-gradient(circle at 35% 35%,#FFE9A8,var(--sun));box-shadow:0 0 34px rgba(255,201,60,.55);
    animation:spin 26s linear infinite}
.cloud{position:absolute;fill:#FFFFFF;opacity:.95;filter:drop-shadow(0 6px 12px rgba(74,144,217,.14))}
.cloud.c1{top:52px;left:6%;width:150px;animation:drift 22s ease-in-out infinite alternate}
.cloud.c2{top:150px;right:16%;width:104px;animation:drift 28s ease-in-out infinite alternate-reverse}
.cloud.c3{top:260px;left:-40px;width:180px;opacity:.7;animation:drift 32s ease-in-out infinite alternate}
.star{position:absolute;fill:var(--sun);animation:twinkle 3.4s ease-in-out infinite}
.star.s1{top:84px;left:22%;width:20px}
.star.s2{top:210px;left:58%;width:14px;animation-delay:.9s}
.star.s3{top:120px;left:78%;width:12px;animation-delay:1.7s}
.rainbow{position:absolute;top:300px;right:-40px;width:190px;opacity:.5;pointer-events:none}
@keyframes drift{from{transform:translateX(0)}to{transform:translateX(46px)}}
@keyframes twinkle{0%,100%{opacity:.25;transform:scale(.85)}50%{opacity:1;transform:scale(1.12)}}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== Hero ===== */
.hero{padding:74px 0 30px;text-align:center}
.badge{display:inline-flex;align-items:center;gap:8px;background:#fff;border:2px solid var(--line);
    color:var(--blue-d);font-size:13px;font-weight:700;padding:7px 16px;border-radius:999px;
    box-shadow:0 4px 12px rgba(74,144,217,.12)}
.badge svg{width:15px;height:15px}
h1{font-size:46px;line-height:1.25;margin:20px 0 6px;color:var(--ink);letter-spacing:2px}
h1 .hi{color:var(--coral)}
.sub{font-size:16px;color:var(--sub);max-width:600px;margin:10px auto 0;line-height:1.8}
.stats{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin:26px 0 8px}
.stat{background:#fff;border:2px solid var(--line);border-radius:16px;padding:12px 20px;min-width:128px;
    box-shadow:0 6px 16px rgba(74,144,217,.10)}
.stat b{display:block;font-size:24px;color:var(--blue-d);line-height:1.2}
.stat span{font-size:12.5px;color:var(--sub)}

/* ===== 下载卡片 ===== */
.panel{background:var(--card);border-radius:26px;border:2px solid var(--line);
    box-shadow:0 16px 44px rgba(47,111,179,.13);padding:30px;margin:26px 0 0}
.download-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.cover{width:112px;height:148px;border-radius:12px;overflow:hidden;flex:none;box-shadow:0 8px 20px rgba(47,111,179,.25);
    background:linear-gradient(160deg,#5B9BD5,#2F6FB3);display:flex;flex-direction:column;justify-content:center;align-items:center;color:#fff}
.cover .mini{font-family:"Comic Sans MS","Comic Neue",cursive;font-size:22px;font-weight:700;letter-spacing:1px}
.cover .mini2{font-size:10px;opacity:.92;margin-top:4px;letter-spacing:2px}
.cover svg{width:34px;height:34px;fill:rgba(255,255,255,.35);margin-top:8px}
.dl-info{flex:1;min-width:220px}
.dl-info h2{font-size:22px;color:var(--ink)}
.dl-info p{color:var(--sub);font-size:13.5px;line-height:1.9;margin-top:6px}
.dl-info p b{color:var(--blue-d)}
.btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;text-decoration:none;
    border-radius:999px;font-size:16px;font-weight:700;padding:15px 30px;transition:transform .15s ease,box-shadow .15s ease;cursor:pointer}
.btn svg{width:20px;height:20px;flex:none}
.btn.download{background:linear-gradient(135deg,#FF8A65,#F26B3F);color:#fff;
    box-shadow:0 10px 24px rgba(242,107,63,.38)}
.btn.download:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(242,107,63,.45)}
.hint{font-size:12px;color:#9AA8B8;margin-top:12px;display:flex;align-items:center;gap:6px}
.hint svg{width:14px;height:14px}

/* ===== 字母分区 ===== */
.letters{margin-top:34px}
.sec-title{display:flex;align-items:center;gap:10px;font-size:20px;color:var(--ink);margin-bottom:6px}
.sec-title svg{width:22px;height:22px}
.sec-desc{font-size:13px;color:var(--sub);margin-bottom:16px}
.letter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(86px,1fr));gap:10px}
.chip{display:flex;flex-direction:column;align-items:center;justify-content:center;background:#fff;
    border:2px solid var(--line);border-radius:16px;padding:10px 4px;transition:transform .14s ease}
.chip:hover{transform:translateY(-3px) rotate(-1deg)}
.chip b{font-family:"Comic Sans MS","Comic Neue",cursive;font-size:22px;line-height:1}
.chip span{font-size:11px;color:var(--sub);margin-top:5px}
.chip.c0 b{color:#F2A93B}.chip.c1 b{color:#4A90D9}.chip.c2 b{color:#2FA77B}
.chip.c3 b{color:#E0618F}.chip.c4 b{color:#8E6BD8}.chip.c5 b{color:#E0744C}

/* ===== 使用小贴士 ===== */
.tips{margin-top:34px;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.tip{background:#fff;border:2px solid var(--line);border-radius:20px;padding:20px}
.tip .ico{width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.tip .ico svg{width:24px;height:24px}
.tip h3{font-size:16px;color:var(--ink);margin-bottom:6px}
.tip p{font-size:13px;color:var(--sub);line-height:1.9}
.tip.t0 .ico{background:#FFF1E6;fill:#F26B3F}
.tip.t1 .ico{background:#E7F5FF;fill:#4A90D9}
.tip.t2 .ico{background:#E8FAF4;fill:#2FA77B}

footer{margin:44px 0 28px;text-align:center;color:#9AA8B8;font-size:12.5px;line-height:2}
footer b{color:#7E8FA3}

/* ===== 响应式 ===== */
@media (max-width:760px){
    h1{font-size:34px}
    .hero{padding-top:52px}
    .panel{padding:22px;border-radius:20px}
    .cover{width:86px;height:114px}
    .cover .mini{font-size:17px}
    .tips{grid-template-columns:1fr}
    .stats{gap:8px}
    .stat{min-width:calc(50% - 8px);padding:10px 12px}
    .stat b{font-size:20px}
}
@media (max-width:430px){
    .btns .btn{width:100%}
    .letter-grid{grid-template-columns:repeat(auto-fill,minmax(66px,1fr));gap:8px}
}