/* ===== 基础与变量 ===== */
:root{
  --bg:#0a0408; --bg2:#150a14; --bg3:#1f0f1c;
  --gold:#ffc94d; --gold2:#f0a500; --gold3:#b8860b;
  --red:#c0392b; --red2:#8e1f16;
  --txt:#f5ecdc; --txt-dim:#b8a893;
  --line:rgba(255,201,77,.18);
  --grad-gold:linear-gradient(135deg,#ffe9a8 0%,#ffc94d 35%,#f0a500 65%,#ffd97a 100%);
  --shadow:0 20px 60px rgba(0,0,0,.55);
  --radius:18px;
  --font:'PingFang SC','Microsoft YaHei','Noto Sans SC',system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font); color:var(--txt); background:var(--bg);
  overflow-x:hidden; line-height:1.7; -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{width:min(1200px,92%);margin-inline:auto}
section{position:relative}
::-webkit-scrollbar{width:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:linear-gradient(var(--gold2),var(--red2));border-radius:8px}

/* 氛围光效 */
.ambient-glow{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(60% 40% at 80% -5%, rgba(192,57,43,.25), transparent 60%),
    radial-gradient(50% 35% at 10% 10%, rgba(240,165,0,.16), transparent 60%),
    radial-gradient(45% 30% at 50% 110%, rgba(142,31,22,.28), transparent 60%);
}

/* ===== 导航栏 ===== */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:14px 0;transition:.35s;
  background:linear-gradient(180deg,rgba(10,4,8,.85),rgba(10,4,8,.35) 70%,transparent);
}
.navbar.scrolled{background:rgba(10,4,8,.92);backdrop-filter:blur(14px);padding:8px 0;box-shadow:0 6px 30px rgba(0,0,0,.5)}
.nav-inner{width:min(1200px,92%);margin-inline:auto;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-icon{width:42px;height:42px;border-radius:12px;box-shadow:0 0 18px rgba(255,201,77,.4),inset 0 0 0 1px rgba(255,255,255,.2)}
.brand-text{font-size:22px;font-weight:800;letter-spacing:2px;color:var(--gold);
  background:var(--grad-gold);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.brand-text em{font-style:normal;color:#fff;-webkit-text-fill-color:#fff}
.nav-links{display:flex;gap:26px;margin-inline:auto}
.nav-links a{font-size:15px;color:var(--txt-dim);position:relative;padding:6px 2px;transition:.3s}
.nav-links a::after{content:'';position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--grad-gold);transition:.3s}
.nav-links a:hover,.nav-links a.active{color:var(--gold)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{flex-shrink:0;padding:9px 22px;border-radius:30px;font-size:14px;font-weight:700;color:#3a1200;
  background:var(--grad-gold);box-shadow:0 6px 20px rgba(240,165,0,.35);transition:.3s}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(240,165,0,.5)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--gold);border-radius:2px;transition:.3s}

/* ===== 主视觉 Hero ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden}
.hero-slider{position:absolute;inset:0}
.hero-slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1.2s ease;transform:scale(1.06)}
.hero-slide.is-active{opacity:1;animation:kenburns 9s ease forwards}
@keyframes kenburns{from{transform:scale(1.06)}to{transform:scale(1.14)}}
.hero-mask{position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(10,4,8,.55) 0%,rgba(10,4,8,.25) 40%,var(--bg) 96%)}
.hero-inner{position:relative;z-index:2;width:min(1200px,92%);margin-inline:auto;padding:120px 0 40px}
.hero-tag{display:inline-flex;align-items:center;gap:10px;padding:7px 18px;border-radius:30px;font-size:13px;letter-spacing:3px;color:var(--gold);
  border:1px solid var(--line);background:rgba(20,8,16,.55);backdrop-filter:blur(6px)}
.hero-tag::before{content:'';width:7px;height:7px;border-radius:50%;background:var(--red);box-shadow:0 0 12px var(--red);animation:pulse 1.8s infinite}
@keyframes pulse{50%{opacity:.4;transform:scale(.8)}}
.hero-title{font-size:clamp(42px,8vw,84px);font-weight:900;line-height:1.15;margin:22px 0 14px;letter-spacing:4px;
  background:linear-gradient(180deg,#fff 20%,var(--gold) 55%,var(--gold2) 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  filter:drop-shadow(0 6px 30px rgba(240,165,0,.3))}
.hero-title .dot{color:var(--red);-webkit-text-fill-color:var(--red)}
.hero-sub{max-width:640px;font-size:16px;color:var(--txt-dim)}
.hero-meta{display:flex;flex-wrap:wrap;gap:12px 26px;margin:20px 0 28px;font-size:14px;color:var(--txt)}
.hero-meta span{display:inline-flex;align-items:center;gap:8px}
.dot-red,.dot-gold{width:9px;height:9px;border-radius:50%;display:inline-block}
.dot-red{background:var(--red);box-shadow:0 0 12px var(--red)}
.dot-gold{background:var(--gold);box-shadow:0 0 12px var(--gold)}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 34px;border-radius:34px;font-size:16px;font-weight:800;letter-spacing:1px;transition:.3s;cursor:pointer;border:0}
.btn-primary{color:#3a1200;background:var(--grad-gold);box-shadow:0 10px 34px rgba(240,165,0,.4),inset 0 1px 0 rgba(255,255,255,.5)}
.btn-primary:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 16px 44px rgba(240,165,0,.55)}
.btn-ghost{color:var(--gold);border:1px solid var(--line);background:rgba(20,8,16,.4);backdrop-filter:blur(6px)}
.btn-ghost:hover{background:rgba(240,165,0,.12);transform:translateY(-3px)}
.btn-lg{padding:16px 46px;font-size:18px}
.hero-stats{display:grid;grid-template-columns:repeat(4,minmax(120px,1fr));gap:14px;margin-top:54px;max-width:760px}
.stat{padding:16px 10px;text-align:center;border:1px solid var(--line);border-radius:14px;
  background:rgba(15,6,12,.55);backdrop-filter:blur(8px);transition:.3s}
.stat:hover{transform:translateY(-4px);border-color:rgba(255,201,77,.45)}
.stat strong{display:block;font-size:24px;color:var(--gold);letter-spacing:1px}
.stat span{font-size:12px;color:var(--txt-dim)}
.hero-controls{position:absolute;z-index:3;right:max(4%,20px);bottom:26px;display:flex;align-items:center;gap:10px}
.hero-arrow{width:44px;height:44px;border-radius:50%;border:1px solid var(--line);color:var(--gold);font-size:22px;
  background:rgba(15,6,12,.5);cursor:pointer;transition:.3s}
.hero-arrow:hover{background:var(--gold);color:#3a1200}
.hero-dots{display:flex;gap:8px}
.hero-dots span{width:26px;height:4px;border-radius:4px;background:rgba(255,255,255,.25);cursor:pointer;transition:.3s}
.hero-dots span.is-active{background:var(--gold)}


/* ===== 数据亮点 ===== */
.highlight{position:relative;z-index:2;padding:26px 0;margin-top:-10px}
.highlight-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.highlight-grid li{display:flex;align-items:center;gap:14px;padding:18px 20px;border-radius:var(--radius);
  border:1px solid var(--line);background:linear-gradient(135deg,rgba(31,15,28,.9),rgba(21,10,20,.9));
  box-shadow:var(--shadow);transition:.3s}
.highlight-grid li:hover{transform:translateY(-4px);border-color:rgba(255,201,77,.4)}
.hl-icon{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--gold2),var(--red2));flex-shrink:0;
  position:relative;box-shadow:0 6px 16px rgba(240,165,0,.3)}
.hl-icon::after{content:'';position:absolute;inset:8px;border:1px solid rgba(255,255,255,.6);border-radius:7px}
.highlight-grid strong{display:block;font-size:16px;color:var(--gold)}
.highlight-grid span{font-size:12.5px;color:var(--txt-dim)}

/* ===== 通用章节标题 ===== */
.section-head{text-align:center;margin-bottom:44px;position:relative;z-index:2}
.section-eyebrow{font-size:12.5px;letter-spacing:4px;color:var(--gold2);margin-bottom:10px}
.section-title{font-size:clamp(28px,4.6vw,44px);font-weight:900;letter-spacing:2px;color:#fff}
.section-title .accent{color:var(--gold);text-shadow:0 0 24px rgba(240,165,0,.4)}
.section-sub{color:var(--txt-dim);font-size:14px;margin-top:8px}

/* ===== 福利区 ===== */
.welfare{padding:96px 0;position:relative;z-index:2}
.welfare::before{content:'';position:absolute;inset:0;background:radial-gradient(70% 60% at 50% 0%,rgba(192,57,43,.10),transparent 70%)}
.welfare-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative}
.welfare-card{padding:26px 22px;border-radius:var(--radius);border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(31,15,28,.85),rgba(15,6,12,.9));transition:.35s;position:relative;overflow:hidden}
.welfare-card::before{content:'';position:absolute;top:-60px;right:-60px;width:140px;height:140px;border-radius:50%;
  background:radial-gradient(rgba(240,165,0,.22),transparent 70%);transition:.4s}
.welfare-card:hover{transform:translateY(-6px);border-color:rgba(255,201,77,.45);box-shadow:var(--shadow)}
.welfare-card:hover::before{transform:scale(1.6)}
.welfare-num{font-size:13px;font-weight:800;letter-spacing:2px;color:var(--gold2);opacity:.8}
.welfare-card h3{font-size:19px;margin:10px 0 8px;color:#fff}
.welfare-card p{font-size:13.5px;color:var(--txt-dim)}
.highlight-card{border-color:rgba(255,201,77,.5);background:linear-gradient(160deg,rgba(60,30,16,.9),rgba(40,16,12,.95))}
.highlight-card h3{color:var(--gold)}


/* ===== 剧情区 ===== */
.story{padding:96px 0;position:relative;z-index:2}
.story-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.story-text .section-eyebrow{text-align:left}
.story-text .section-title{margin-bottom:22px}
.story-lead{color:var(--txt-dim);font-size:15.5px;margin-bottom:16px;text-indent:2em}
.story-visual{position:relative}
.story-poster{position:relative;border-radius:24px;overflow:hidden;box-shadow:var(--shadow);
  border:1px solid var(--line);transform:rotate(1.5deg)}
.story-poster img{width:100%;height:100%;object-fit:cover;transition:.6s}
.story-poster:hover img{transform:scale(1.05)}
.story-badge{position:absolute;top:18px;right:-34px;transform:rotate(38deg);padding:7px 44px;font-size:13px;font-weight:800;letter-spacing:2px;
  color:#3a1200;background:var(--grad-gold);box-shadow:0 6px 20px rgba(240,165,0,.4)}

/* ===== 心魔妖王 ===== */
.boss{padding:96px 0;position:relative;z-index:2;
  background:linear-gradient(180deg,transparent,rgba(192,57,43,.06) 30%,rgba(192,57,43,.06) 70%,transparent)}
.boss-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.boss-card{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);
  transition:.4s;cursor:pointer;box-shadow:0 10px 30px rgba(0,0,0,.4)}
.boss-card:hover{transform:translateY(-10px) scale(1.03);z-index:5;border-color:rgba(255,201,77,.6);box-shadow:0 24px 50px rgba(0,0,0,.6)}
.boss-img{aspect-ratio:720/1280;overflow:hidden}
.boss-img img{width:100%;height:100%;object-fit:cover;transition:.6s}
.boss-card:hover .boss-img img{transform:scale(1.12)}
.boss-card figcaption{position:absolute;left:0;right:0;bottom:0;padding:34px 16px 14px;display:flex;flex-direction:column;gap:2px;
  background:linear-gradient(180deg,transparent,rgba(10,4,8,.92))}
.boss-card figcaption span{font-size:11px;letter-spacing:3px;color:var(--gold2)}
.boss-card figcaption h3{font-size:17px;color:#fff;letter-spacing:2px}


/* ===== 游戏截图 ===== */
.gallery{padding:96px 0;position:relative;z-index:2}
.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;max-width:1020px;margin-inline:auto}
.gallery-item{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);
  aspect-ratio:434/946;cursor:zoom-in;transition:.4s;box-shadow:0 12px 34px rgba(0,0,0,.4)}
.gallery-item img{width:100%;height:100%;object-fit:cover;transition:.6s}
.gallery-item:hover{transform:translateY(-6px);border-color:rgba(255,201,77,.5);box-shadow:var(--shadow)}
.gallery-item:hover img{transform:scale(1.08)}

/* ===== 游戏视频 ===== */
.video-section{padding:96px 0;position:relative;z-index:2}
.video-section::before{content:'';position:absolute;inset:0;background:radial-gradient(60% 55% at 50% 50%,rgba(58,109,240,.08),transparent 70%)}
.video-box{position:relative;max-width:960px;margin-inline:auto;border-radius:20px;overflow:hidden;
  aspect-ratio:16/9;background:#000;border:1px solid var(--line);box-shadow:0 22px 60px rgba(0,0,0,.55)}
.video-box video{width:100%;height:100%;display:block;object-fit:cover}
.video-cover{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
  background:linear-gradient(180deg,rgba(10,4,8,.35),rgba(10,4,8,.65));cursor:pointer;transition:opacity .4s,visibility .4s}
.video-cover.hide{opacity:0;visibility:hidden;pointer-events:none}
.video-cover span{font-size:13px;letter-spacing:3px;color:var(--gold);text-shadow:0 2px 10px rgba(0,0,0,.8)}
.video-play{width:82px;height:82px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  color:#3a1200;background:var(--grad-gold);border:0;cursor:pointer;position:relative;
  box-shadow:0 0 0 0 rgba(240,165,0,.5);animation:video-pulse 2.2s infinite}
.video-play::after{content:'';position:absolute;inset:0;border-radius:50%;border:2px solid rgba(255,201,77,.6)}
@keyframes video-pulse{0%{box-shadow:0 0 0 0 rgba(240,165,0,.45)}70%{box-shadow:0 0 0 20px rgba(240,165,0,0)}100%{box-shadow:0 0 0 0 rgba(240,165,0,0)}}
.video-play svg{margin-left:4px}
.video-play:hover{transform:scale(1.06)}
@media(max-width:768px){.video-box{border-radius:14px}.video-play{width:66px;height:66px}}

/* ===== 资讯 ===== */
.articles{padding:96px 0;position:relative;z-index:2;
  background:linear-gradient(180deg,transparent,rgba(21,10,20,.8))}
.article-list{max-width:860px;margin-inline:auto;display:flex;flex-direction:column;gap:12px}
.article-item{display:flex;align-items:center;gap:18px;padding:17px 22px;border-radius:14px;
  border:1px solid var(--line);background:rgba(21,10,20,.6);transition:.3s}
.article-item:hover{border-color:rgba(255,201,77,.45);transform:translateX(8px);background:rgba(31,15,28,.8)}
.article-date{flex-shrink:0;font-size:12.5px;color:var(--gold2);border:1px solid var(--line);padding:4px 12px;border-radius:20px;letter-spacing:1px}
.article-item p{flex:1;font-size:15px;color:var(--txt)}
.article-item i{color:var(--gold);font-style:normal;font-size:20px;transition:.3s}
.article-item:hover i{transform:translateX(4px)}


/* ===== 下载区 ===== */
.download{padding:70px 0 96px;position:relative;z-index:2}
.download-box{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;
  padding:38px 44px;border-radius:26px;position:relative;overflow:hidden;
  border:1px solid rgba(255,201,77,.35);
  background:linear-gradient(135deg,rgba(60,30,16,.9),rgba(30,10,22,.95))}
.download-box::before{content:'';position:absolute;top:-50%;left:-20%;width:60%;height:200%;transform:rotate(20deg);
  background:linear-gradient(90deg,transparent,rgba(255,201,77,.12),transparent);animation:shine 5s infinite}
@keyframes shine{0%,60%{transform:translateX(-120%) rotate(20deg)}100%{transform:translateX(320%) rotate(20deg)}}
.download-info{display:flex;align-items:center;gap:22px;position:relative}
.download-icon{width:88px;height:88px;border-radius:20px;box-shadow:0 10px 30px rgba(240,165,0,.4)}
.download-info h2{font-size:28px;color:var(--gold)}
.download-info p{font-size:14px;color:var(--txt-dim)}
.download-tags{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
.download-tags span{font-size:12px;padding:3px 12px;border-radius:20px;border:1px solid var(--line);color:var(--gold)}
/* ===== 二维码 ===== */
.btn-download-wrap{position:relative}
.btn-qr{position:absolute;bottom:calc(100% + 16px);left:50%;transform:translateX(-50%) translateY(10px);
  display:flex;flex-direction:column;align-items:center;gap:8px;padding:12px 12px 10px;border-radius:14px;
  background:rgba(15,6,12,.94);border:1px solid var(--line);box-shadow:0 14px 40px rgba(0,0,0,.55);
  opacity:0;visibility:hidden;transition:opacity .3s ease,transform .3s ease,visibility .3s;z-index:20;width: 140px;}
.btn-qr::after{content:"";position:absolute;top:100%;left:50%;transform:translateX(-50%);
  border:8px solid transparent;border-top-color:rgba(15,6,12,.94)}
.btn-qr em{font-style:normal;font-size:12px;letter-spacing:2px;color:var(--gold)}
.btn-qr-box{display:block;padding:8px;background:#fff;border-radius:10px;line-height:0}
.btn-qr-box img,.btn-qr-box canvas{display:block}
@media (hover:hover) and (pointer:fine){
  .btn-download-wrap:hover .btn-qr{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
}
.download-actions{position:relative;text-align:center}
.download-qr{display:flex;flex-direction:column;align-items:center;gap:10px;margin-top:20px;padding:18px 20px 14px;
  border-radius:16px;background:rgba(15,6,12,.6);border:1px solid var(--line);width:max-content;margin-inline:auto}
.download-qr-box{display:block;padding:10px;background:#fff;border-radius:12px;line-height:0;
  box-shadow:0 6px 20px rgba(0,0,0,.35)}
.download-qr-box img,.download-qr-box canvas{display:block}
.download-qr em{font-style:normal;font-size:13px;letter-spacing:2px;color:var(--gold)}
.download-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.download-btns .btn{gap:8px}
.btn-ios{color:#e8f3ff;background:linear-gradient(160deg,#3a6df0,#1d3fae);box-shadow:0 10px 34px rgba(58,109,240,.35),inset 0 1px 0 rgba(255,255,255,.35)}
.btn-ios:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 16px 44px rgba(58,109,240,.5)}
.download-note{margin-top:12px;font-size:13px;color:var(--gold);letter-spacing:1px}

/* ===== 页脚 ===== */
.footer{position:relative;z-index:2;padding:36px 0;border-top:1px solid var(--line);
  background:rgba(10,4,8,.8)}
.footer-inner{text-align:center}
.footer-brand{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:12px}
.footer-icon{width:34px;height:34px;border-radius:9px}
.footer-brand span{font-size:19px;font-weight:800;color:var(--gold)}
.footer-desc{font-size:13.5px;color:var(--txt-dim);margin-bottom:10px}
.footer-links{margin:16px auto 20px;padding-top:18px;border-top:1px solid var(--line);max-width:720px}
.footer-links-title{display:inline-block;font-size:13px;color:var(--gold);letter-spacing:2px;margin-bottom:12px}
.footer-links-list{display:flex;justify-content:center;flex-wrap:wrap;gap:6px 18px}
.footer-links-list a{font-size:13px;color:var(--txt-dim);transition:.3s}
.footer-links-list a:hover{color:var(--gold)}
.footer-copy{font-size:12px;color:#7a6b58;margin-bottom:4px}

/* ===== 响应式 ===== */
@media(max-width:1024px){
  .highlight-grid{grid-template-columns:repeat(2,1fr)}
  .welfare-grid{grid-template-columns:repeat(2,1fr)}
  .boss-grid{grid-template-columns:repeat(3,1fr);gap:16px}
  .story-grid{grid-template-columns:1fr;gap:40px}
  .story-poster{max-width:420px;margin-inline:auto}
  .gallery-grid{gap:16px}
}
@media(max-width:768px){
  .navbar.scrolled,.navbar.menu-open{background:rgba(10,4,8,.98);backdrop-filter:none}
  .nav-links{position:fixed;top:64px;right:0;bottom:0;width:min(78vw,320px);flex-direction:column;gap:0;
    background:#0f060c;padding:24px 30px;transform:translateX(100%);transition:.4s;z-index:99;
    border-left:1px solid var(--line)}
  .nav-links.open{transform:translateX(0)}
  .nav-links a{padding:14px 0;font-size:17px;border-bottom:1px solid rgba(255,255,255,.06)}
  .nav-toggle{display:flex}
  .nav-cta{display:none}
  .hero{min-height:92vh}
  .hero-title{font-size:40px}
  .hero-stats{grid-template-columns:repeat(2,1fr);margin-top:38px}
  .hero-controls{bottom:14px;right:14px}
  .highlight-grid{grid-template-columns:1fr 1fr}
  .welfare-grid{grid-template-columns:1fr}
  .boss-grid{grid-template-columns:repeat(2,1fr)}
  .gallery-grid{grid-template-columns:repeat(2,1fr);gap:14px;max-width:520px}
  .download-box{padding:30px 24px;justify-content:center;text-align:center}
  .download-info{flex-direction:column;text-align:center}
}
@media(max-width:480px){
  .hero-title{font-size:32px;letter-spacing:2px}
  .hero-meta{flex-direction:column;gap:8px}
  .btn{padding:13px 26px;font-size:15px}
  .highlight-grid{grid-template-columns:1fr}
  .boss-grid{grid-template-columns:1fr 1fr;gap:12px}
  .boss-card figcaption h3{font-size:14px}
  .article-item{gap:10px;padding:14px 16px;flex-wrap:wrap}
  .download-btns{flex-direction:column;align-items:center}
  .download-btns .btn{width:min(280px,100%)}
  .download-box{padding:26px 18px}
}


/* ===== 滚动入场动画 ===== */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .7s ease,transform .7s ease}
.reveal-in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ===== 返回顶部 ===== */
.back-top{position:fixed;right:22px;bottom:26px;z-index:98;width:46px;height:46px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;color:#fff;cursor:pointer;
  background:linear-gradient(135deg,#f0a500,#c0392b);border:1px solid rgba(255,201,77,.55);
  box-shadow:0 8px 22px rgba(0,0,0,.45),0 0 18px rgba(240,165,0,.35);
  opacity:0;visibility:hidden;transform:translateY(16px);transition:.35s ease}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(0,0,0,.5),0 0 26px rgba(240,165,0,.55)}
.back-top:active{transform:scale(.94)}
@media(max-width:480px){.back-top{right:14px;bottom:18px;width:42px;height:42px}}