:root{
  --bg:#f6f3ec;
  --bg2:#fbf9f4;
  --panel:#ffffff;
  --panel2:#faf7f0;
  --line:#e7e0d1;
  --text:#232a36;
  --muted:#6b7486;
  --gold:#b8934f;
  --gold2:#96702e;
  --blue:#1e3a5f;
  --green:#2e9e6b;
  --radius:16px;
  --nav-h:68px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-sm:0 2px 10px rgba(30,40,66,.05);
  --shadow-md:0 12px 32px rgba(30,40,66,.08);
  --shadow-lg:0 24px 60px rgba(30,40,66,.13);
}
*{margin:0;padding:0;box-sizing:border-box}
html{
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--nav-h) + 16px);
}
body{
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  background-image:
    radial-gradient(ellipse 62% 42% at 50% -8%,rgba(184,147,79,.10),transparent),
    linear-gradient(180deg,#fbf8f1 0%,var(--bg) 42%);
  background-attachment:fixed;
}
::selection{background:rgba(184,147,79,.22)}
a{color:var(--gold);text-decoration:none}
img{max-width:100%}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* ---------- 导航 ---------- */
nav{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.84);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  box-shadow:0 4px 18px rgba(30,40,66,.05);
  transition:box-shadow .3s var(--ease),background .3s var(--ease);
}
nav.scrolled{background:rgba(255,255,255,.95);box-shadow:0 8px 28px rgba(30,40,66,.10)}
.nav-inner{display:flex;align-items:center;gap:12px;height:var(--nav-h);position:relative}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--blue);white-space:nowrap}
.logo .ico{width:34px;height:34px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px;background:linear-gradient(135deg,rgba(184,147,79,.20),rgba(184,147,79,.08));border:1px solid rgba(184,147,79,.35);transition:transform .3s var(--ease)}
.logo img.ico{object-fit:cover;font-size:0}
.hero-logo{display:flex;justify-content:center;margin-bottom:24px}
.hero-logo img{width:96px;height:96px;border-radius:26px;box-shadow:0 12px 34px rgba(14,28,52,.38),0 0 0 1px rgba(184,147,79,.45);transition:transform .4s var(--ease)}
.hero:hover .hero-logo img{transform:scale(1.04) rotate(-2deg)}
.logo:hover .ico{transform:rotate(-6deg) scale(1.05)}
.logo .v{font-size:11px;font-weight:500;color:var(--gold);border:1px solid rgba(184,147,79,.45);border-radius:99px;padding:1px 8px;margin-left:2px;background:rgba(184,147,79,.06)}
.nav-links{margin-left:auto;display:flex;gap:4px;align-items:center}
.nav-links a{color:var(--muted);font-size:14px;padding:8px 14px;border-radius:8px;transition:color .2s var(--ease),background .2s var(--ease)}
.nav-links a:hover{color:var(--blue);background:rgba(184,147,79,.08)}
.nav-cta{background:linear-gradient(135deg,var(--gold),var(--gold2))!important;color:#fffdf7!important;font-weight:700;box-shadow:0 6px 18px rgba(184,147,79,.28);transition:transform .2s var(--ease),box-shadow .2s var(--ease)!important}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(184,147,79,.38)}
.nav-toggle{
  display:none;margin-left:auto;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);
  background:rgba(255,255,255,.8);cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px;padding:0;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--blue);transition:transform .3s var(--ease),opacity .3s var(--ease)}
.nav-toggle:hover{border-color:rgba(184,147,79,.5);background:rgba(184,147,79,.06)}
.nav-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-open .nav-toggle span:nth-child(2){opacity:0}
.nav-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(max-width:760px){
  .nav-toggle{display:flex}
  .nav-links{
    position:absolute;top:100%;left:0;right:0;margin:0;padding:6px 16px 18px;
    flex-direction:column;align-items:stretch;gap:2px;
    background:rgba(255,255,255,.98);backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line);box-shadow:0 20px 36px rgba(30,40,66,.10);
    max-height:0;overflow:hidden;opacity:0;visibility:hidden;
    transition:max-height .38s var(--ease),opacity .25s ease,visibility .25s;
  }
  .nav-open .nav-links{max-height:400px;opacity:1;visibility:visible}
  .nav-links a{display:block;padding:13px 16px;font-size:15px;border-radius:10px}
  .nav-cta{margin-top:10px;text-align:center}
}

/* ---------- Hero ---------- */
.hero{
  position:relative;padding:112px 0 92px;text-align:center;
  background:
    radial-gradient(ellipse 60% 50% at 50% -10%,rgba(184,147,79,.16),transparent),
    radial-gradient(ellipse 40% 40% at 82% 18%,rgba(30,58,95,.07),transparent),
    radial-gradient(ellipse 40% 40% at 12% 30%,rgba(184,147,79,.07),transparent);
  animation:fadeUp .8s var(--ease) both;
}
@keyframes fadeUp{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
.hero .badge{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(184,147,79,.10);border:1px solid rgba(184,147,79,.35);
  color:var(--gold);font-size:13px;font-weight:600;padding:6px 16px;border-radius:99px;margin-bottom:26px;
  backdrop-filter:blur(4px);
}
.hero .badge .dot{width:8px;height:8px;border-radius:50%;background:var(--green);animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero h1{font-size:clamp(34px,6vw,58px);font-weight:800;letter-spacing:1px;line-height:1.22;color:var(--blue);text-wrap:balance}
.hero h1 .grad{background:linear-gradient(120deg,var(--gold),var(--gold2) 60%,#d9b878);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{max-width:640px;margin:20px auto 0;color:var(--muted);font-size:17px}
.hero .tags{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:30px}
.hero .tags span{font-size:13px;color:var(--muted);border:1px solid var(--line);background:rgba(255,255,255,.7);padding:6px 14px;border-radius:99px;box-shadow:var(--shadow-sm);transition:transform .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease)}
.hero .tags span:hover{transform:translateY(-2px);border-color:rgba(184,147,79,.45);color:var(--blue)}
.hero .btns{display:flex;gap:14px;justify-content:center;margin-top:38px;flex-wrap:wrap}
.btn{
  position:relative;display:inline-flex;align-items:center;gap:8px;padding:13px 30px;border-radius:12px;
  font-size:16px;font-weight:700;cursor:pointer;border:none;overflow:hidden;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.btn-gold{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#fffdf7;box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 8px 26px rgba(184,147,79,.32)}
.btn-gold:hover{transform:translateY(-3px);box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 14px 34px rgba(184,147,79,.42)}
.btn-gold:active{transform:translateY(0) scale(.97)}
.btn-ghost{background:rgba(255,255,255,.7);color:var(--blue);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold);background:rgba(255,255,255,.96);transform:translateY(-3px)}
.btn-ghost:active{transform:translateY(0) scale(.97)}
.btn:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.hero .ver-note{margin-top:18px;font-size:12.5px;color:var(--muted)}

/* ---------- 通用分区 ---------- */
section{padding:88px 0}
.sec-head{text-align:center;margin-bottom:56px}
.sec-head .kicker{font-size:13px;letter-spacing:3px;color:var(--gold);text-transform:uppercase;font-weight:700}
.sec-head h2{font-size:clamp(26px,4vw,36px);margin-top:10px;font-weight:800;color:var(--blue);letter-spacing:.5px;text-wrap:balance}
.sec-head p{color:var(--muted);margin-top:12px;max-width:560px;margin-left:auto;margin-right:auto}

/* ---------- 功能卡片 ---------- */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:linear-gradient(160deg,#ffffff,#faf7f1);
  border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;
  position:relative;overflow:hidden;box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.card::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 90% 60% at 50% -10%,rgba(184,147,79,.08),transparent);opacity:0;transition:opacity .35s var(--ease)}
.card::after{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,transparent,rgba(184,147,79,.55),transparent);opacity:0;transition:opacity .35s var(--ease)}
.card:hover{transform:translateY(-6px);border-color:rgba(184,147,79,.45);box-shadow:var(--shadow-lg)}
.card:hover::before,.card:hover::after{opacity:1}
.card .ico{
  width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  font-size:26px;margin-bottom:18px;background:linear-gradient(135deg,rgba(184,147,79,.16),rgba(184,147,79,.06));border:1px solid rgba(184,147,79,.28);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.card:hover .ico{transform:scale(1.08) rotate(-4deg);box-shadow:0 8px 18px rgba(184,147,79,.22)}
.card h3{font-size:18px;margin-bottom:10px;color:var(--blue);transition:color .25s var(--ease)}
.card:hover h3{color:var(--gold2)}
.card p{font-size:14px;color:var(--muted)}
.card .hl{color:var(--gold);font-weight:600}

/* ---------- 界面预览 ---------- */
.shot{
  max-width:900px;margin:0 auto;background:var(--panel);border:1px solid var(--line);
  border-radius:18px;overflow:hidden;box-shadow:var(--shadow-md);
  transition:box-shadow .3s var(--ease),transform .3s var(--ease);
}
.shot:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.shot .bar{display:flex;align-items:center;gap:10px;padding:12px 18px;background:linear-gradient(180deg,#fafbfd,#eef1f6);border-bottom:1px solid var(--line)}
.shot .bar .t{font-size:14px;font-weight:600;color:var(--blue);flex:1}
.shot .bar .v{font-size:11px;color:#8a94a6;font-weight:500;margin-left:2px;white-space:nowrap}
.shot .bar .wins{display:flex;gap:2px;align-items:center}
.shot .bar .wins i{width:30px;height:24px;display:flex;align-items:center;justify-content:center;font-style:normal;font-size:12px;color:#7f8c8d;border-radius:5px;transition:background .18s var(--ease),color .18s var(--ease)}
.shot .bar .wins i:hover{background:rgba(30,40,66,.08);color:#2c3e50}
.shot-body{background:#f5f7fa;padding:26px}
.tts-head{margin-bottom:12px}
.tts-head .tt{font-size:19px;font-weight:800;color:#2c3e50}
.tts-head .ts{font-size:12.5px;color:#7f8c8d;margin-top:2px}
.tts-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.tts-row + .tts-row{margin-top:12px}
.shot-body > .tts-row{margin-top:4px}
.tts-lab{font-size:13px;color:#7f8c8d;white-space:nowrap}
.tts-combo{background:#f7f5ef;border:1px solid var(--line);border-radius:8px;padding:6px 12px;font-size:12.5px;color:var(--text)}
.tts-combo.wide{flex:1;min-width:0}
.tts-slider{display:flex;align-items:center;gap:10px;flex:1;max-width:380px;min-width:180px}
.tts-track{position:relative;height:4px;border-radius:2px;background:#dde2e6;flex:1;min-width:120px}
.tts-track i{position:absolute;top:50%;width:14px;height:14px;border-radius:50%;background:#b0b8c0;border:2px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.22);transform:translate(-50%,-50%)}
.tts-val{font-size:13px;color:#333;font-weight:600;min-width:26px;text-align:right}
.tts-box{background:#fff;border:1px solid #e6e9ee;border-radius:10px;padding:16px 18px;margin-top:16px;min-height:150px;font-size:14px;color:var(--text);line-height:1.9;box-shadow:inset 0 1px 3px rgba(30,40,66,.05)}
.tts-box .inner{font-size:14px}
.tts-box .caret{display:inline-block;width:2px;height:1.15em;background:#333;vertical-align:-3px;animation:blink 1.1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.tts-btns{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap;align-items:center}
.tts-btns .b{padding:8px 18px;border-radius:6px;font-weight:600;font-size:12.5px;cursor:pointer;border:none;font-family:inherit;transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease),color .18s var(--ease)}
.tts-btns .b:hover{transform:translateY(-1px)}
.tts-btns .b:active{transform:scale(.95)}
.tts-btns .b.play{background:#548df5;color:#fff;box-shadow:0 3px 10px rgba(84,141,245,.28)}
.tts-btns .b.play:hover{background:#4784f2;box-shadow:0 6px 16px rgba(84,141,245,.38)}
.tts-btns .b.sec{background:#e8ecf0;color:#333}
.tts-btns .b.sec:hover{background:#dde3ea}
.tts-status{margin-top:16px;text-align:center;font-size:12.5px;color:#9e9e9e}
.tts-btns .st{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted);margin-left:auto}
.tts-btns .st i{width:9px;height:9px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,158,107,.15)}

/* ---------- 快速上手 ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:32px 26px;box-shadow:var(--shadow-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease)}
.step:hover{transform:translateY(-4px);border-color:rgba(184,147,79,.4);box-shadow:var(--shadow-md)}
.step .num{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--gold),var(--gold2));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:16px;box-shadow:0 6px 14px rgba(184,147,79,.30);transition:transform .3s var(--ease)}
.step:hover .num{transform:scale(1.1)}
.step h3{font-size:16px;margin-bottom:8px;color:var(--blue)}
.step p{font-size:14px;color:var(--muted)}
.step p b{color:var(--text)}

/* ---------- 下载区 ---------- */
.download{
  text-align:center;border-radius:24px;padding:68px 32px;
  background:
    radial-gradient(ellipse 70% 90% at 50% 110%,rgba(184,147,79,.14),transparent),
    linear-gradient(160deg,#ffffff,#f7f2e8);
  border:1px solid rgba(184,147,79,.35);box-shadow:var(--shadow-md);
}
.download h2{font-size:clamp(24px,4vw,34px);font-weight:800;color:var(--blue);text-wrap:balance}
.download p{color:var(--muted);margin:14px auto 30px;max-width:520px}
.dl-wrap{display:inline-block;position:relative}
.dl-btn{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#fffdf7;border:none;padding:15px 38px;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;gap:8px;box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 10px 28px rgba(184,147,79,.36);transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
.dl-btn:hover{transform:translateY(-3px);box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 14px 36px rgba(184,147,79,.46)}
.dl-btn:active{transform:translateY(0) scale(.97)}
.dl-menu{
  position:absolute;top:calc(100% + 12px);left:50%;transform:translateX(-50%);
  min-width:290px;background:#fff;border:1px solid var(--line);border-radius:14px;
  box-shadow:0 24px 54px rgba(30,40,66,.18);padding:8px;z-index:90;
  opacity:0;visibility:hidden;transition:opacity .25s var(--ease),visibility .25s,transform .25s var(--ease);
}
.dl-wrap:hover .dl-menu,.dl-wrap:focus-within .dl-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(4px)}
.dl-menu a{display:flex;align-items:center;gap:10px;padding:11px 14px;border-radius:9px;color:var(--text);font-size:14px;font-weight:600;transition:background .2s var(--ease),transform .18s var(--ease)}
.dl-menu a:hover{background:rgba(184,147,79,.08);color:var(--gold2)}
.dl-menu a:active{transform:scale(.98)}
.dl-menu a small{color:var(--muted);font-weight:400;margin-left:auto;font-size:12px}
.dl-menu .dl-head{font-size:13px;font-weight:700;color:var(--gold2);padding:10px 14px 6px}
.dl-menu .dl-sep{height:1px;background:var(--line);margin:6px 10px}
.pkg{display:inline-flex;align-items:center;gap:10px;background:rgba(30,58,95,.04);border:1px solid var(--line);border-radius:10px;padding:10px 18px;font-size:13px;color:var(--muted);margin-top:22px;font-family:Consolas,monospace;transition:border-color .25s var(--ease),background .25s var(--ease)}
.pkg:hover{border-color:rgba(184,147,79,.4);background:rgba(30,58,95,.06)}
.pkg b{color:var(--blue);font-weight:600}

/* ---------- 赞助区 ---------- */
.sponsor-card{
  max-width:960px;margin:0 auto;display:flex;flex-direction:row;align-items:center;justify-content:center;gap:48px;
  background:linear-gradient(160deg,#ffffff,#faf7f1);border:1px solid var(--line);border-radius:20px;
  padding:40px 32px;box-shadow:var(--shadow-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.sponsor-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:rgba(184,147,79,.4)}
.sponsor-card .info{flex:1;min-width:0;width:100%;text-align:left}
.sponsor-card .info h3{font-size:20px;color:var(--blue);margin-bottom:10px}
.sponsor-card .info p{font-size:14px;color:var(--muted)}
.sponsor-card .qr{text-align:center;background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px;box-shadow:var(--shadow-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease);flex-shrink:0}
.sponsor-card .qr:hover{transform:scale(1.03);box-shadow:var(--shadow-md)}
.sponsor-card .qr img{width:150px;height:150px;border-radius:8px;display:block;margin:0 auto}
.sponsor-card .qr .cap{display:block;margin-top:10px;font-size:12px;color:var(--muted)}

/* ---------- 赞助名单（页面直接渲染，替代「查看赞助名单」外链按钮） ---------- */
.sponsor-list{list-style:none;margin:16px 0 0;padding:0;max-width:560px;width:100%;text-align:left}
.sponsor-list li{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:9px 14px;margin-bottom:8px;font-size:13px;transition:border-color .25s var(--ease),box-shadow .25s var(--ease)}
.sponsor-list li:hover{border-color:rgba(184,147,79,.4);box-shadow:var(--shadow-sm)}
.sponsor-list .rk{flex:0 0 26px;height:26px;line-height:26px;text-align:center;background:var(--blue);color:#fff;border-radius:50%;font-size:12px;font-weight:600}
.sponsor-list .nm{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text);font-weight:500}
.sponsor-list .amt{flex:0 0 auto;color:var(--gold);font-weight:600;font-family:Consolas,monospace}
.sponsor-list .tm{flex:0 0 auto;color:var(--muted);font-size:12px}
.sponsor-list li.empty{justify-content:center;color:var(--muted);font-style:italic;background:transparent;border-style:dashed}

/* ---------- FAQ ---------- */
.faq{max-width:860px;margin:0 auto}
details{background:#ffffff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden;box-shadow:var(--shadow-sm);transition:border-color .25s var(--ease),box-shadow .25s var(--ease)}
details:hover{border-color:rgba(184,147,79,.40);box-shadow:var(--shadow-md)}
details[open]{border-color:rgba(184,147,79,.45)}
summary{cursor:pointer;padding:16px 20px;font-weight:600;list-style:none;display:flex;align-items:center;gap:10px;color:var(--blue);transition:background .2s var(--ease)}
summary:hover{background:rgba(184,147,79,.05)}
summary::-webkit-details-marker{display:none}
summary::before{content:"+";color:var(--gold);font-weight:900;font-size:18px;width:20px;flex:none;transition:transform .3s var(--ease)}
details[open] summary::before{transform:rotate(45deg)}
details .ans{padding:0 20px 18px 50px;color:var(--muted);font-size:14px;animation:fadeUp .35s var(--ease) both}

/* ---------- 注意事项 ---------- */
.notice{max-width:860px;margin:0 auto;background:rgba(255,255,255,.7);border:1px solid var(--line);border-left:4px solid var(--gold);border-radius:12px;padding:24px 28px;box-shadow:var(--shadow-sm)}
.notice b{color:var(--gold2)}
.notice ul{list-style:none;margin-top:10px}
.notice li{position:relative;padding-left:20px;color:var(--muted);font-size:14px;margin-bottom:6px}
.notice li::before{content:"·";position:absolute;left:6px;color:var(--gold);font-weight:900}

/* ---------- Footer ---------- */
footer{padding:36px 0 44px;text-align:center;color:var(--muted);font-size:13px;border-top:1px solid var(--line);background:linear-gradient(180deg,transparent,rgba(184,147,79,.05))}
footer a{color:var(--gold)}
.f-logo{display:flex;align-items:center;justify-content:center;gap:8px;font-weight:700;color:var(--blue);margin-bottom:6px}
.f-logo .ico{font-size:18px}
.studio{color:var(--gold);font-weight:600}
.copy{margin-top:4px;opacity:.85}

/* ---------- 滚动渐入 ---------- */
.fade-in{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease);will-change:opacity,transform}
.fade-in.in{opacity:1;transform:none}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;right:22px;bottom:22px;z-index:95;width:46px;height:46px;border-radius:50%;
  background:rgba(255,255,255,.92);border:1px solid var(--line);box-shadow:var(--shadow-md);
  display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--blue);cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s,border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--gold);color:var(--gold);box-shadow:0 10px 26px rgba(184,147,79,.25)}
.to-top:active{transform:scale(.94)}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  section{padding:68px 0}
  .hero{padding:88px 0 76px}
}
@media(max-width:760px){
  .steps{grid-template-columns:1fr}
}
@media(max-width:640px){
  section{padding:54px 0}
  .sec-head{margin-bottom:38px}
  .hero{padding:72px 0 62px}
  .hero .sub{font-size:15.5px}
  .hero .btns{flex-direction:column;align-items:stretch;max-width:340px;margin-left:auto;margin-right:auto}
  .hero .btns .btn{justify-content:center}
  .grid{gap:18px}
  .card{padding:24px 20px}
  .preview-shot{padding:14px}
  .win .body{padding:14px}
  .tts-combo.wide{min-width:0}
  .tts-combo select{min-width:100%}
  .tts-btns .b{padding:6px 13px;font-size:11px}
  .download{padding:46px 18px}
  .download h2{font-size:22px}
  .pkg{font-size:11.5px;padding:8px 12px;max-width:100%}
  .sponsor-card{flex-direction:column;align-items:center;padding:28px 20px;gap:24px}
  .sponsor-card .info{max-width:560px;text-align:center}
  .sponsor-list{margin:16px auto 0}
  .sponsor-card .qr img{width:170px;height:170px}
  .notice{padding:20px 18px}
  details summary{padding:14px 16px;font-size:15px}
  details .ans{padding:0 16px 16px 44px}
  .logo{font-size:15.5px}
  .logo .ico{width:30px;height:30px;font-size:16px}
  .to-top{right:14px;bottom:14px;width:42px;height:42px}
  footer{padding:30px 0 38px}
}
@media(max-width:400px){
  .hero h1{font-size:30px}
  .sec-head h2{font-size:23px}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
  .fade-in{opacity:1;transform:none}
}