/* 9x阅读器 99xyueduqi.cn —— 黑/白/正红/琥珀金 四色 · 真机嵌套 · 画轴骨架 */
:root{
  --ink:#131417; --red:#f01122; --red-d:#cf0a19; --gold:#ffb531; --gold-d:#e89a12;
  --line:#e4e5e9; --muted:#5c6068; --alt:#f5f5f7;
  --num:Georgia,"Times New Roman",serif;
  --sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:#fff;line-height:1.7;font-size:16px;overflow-x:hidden}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
ul{list-style:none}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* 顶栏 */
.hd{position:sticky;top:0;z-index:50;background:#fff;border-bottom:2px solid var(--ink)}
.hd-in{display:flex;align-items:center;gap:28px;height:72px}
.brand{display:flex;align-items:center;gap:12px;flex:none}
.brand img{border:2px solid var(--ink);box-shadow:3px 3px 0 var(--gold)}
.brand-t{display:flex;flex-direction:column;line-height:1.25}
.brand-t strong{font-size:18px;font-weight:900;letter-spacing:.5px}
.brand-t small{font-size:11px;color:var(--muted)}
.nav{display:flex;gap:26px;margin-left:auto}
.nav a{font-size:14.5px;font-weight:600;color:#3d4149;padding:4px 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a.on{color:var(--red);border-color:var(--red)}
.hd-r{display:flex;align-items:center;gap:14px}
.btn{display:inline-flex;align-items:center;justify-content:center;font-weight:800;letter-spacing:1px;border:2px solid var(--ink);transition:transform .16s ease,box-shadow .16s ease,background .16s ease,color .16s ease}
.btn-pri{background:var(--red);color:#fff;padding:10px 22px;font-size:14px;box-shadow:3px 3px 0 var(--ink)}
.btn-pri:hover{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink);background:var(--red-d)}
.btn-line{background:#fff;color:var(--ink);padding:10px 22px;font-size:14px}
.btn-line:hover{border-color:var(--gold-d);color:var(--gold-d)}
.btn-lg{padding:15px 34px;font-size:16px;box-shadow:5px 5px 0 var(--gold)}
.btn-lg:hover{transform:translate(3px,3px);box-shadow:2px 2px 0 var(--gold)}
.burger{display:none;width:42px;height:38px;border:2px solid var(--ink);background:#fff;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer}
.burger span{display:block;width:18px;height:2px;background:var(--ink)}

/* 区块通用 */
.sec{padding:96px 0}
.sec-alt{background:var(--alt)}
.sec-h{max-width:680px;margin-bottom:48px}
.kick{display:flex;align-items:center;gap:12px;font-size:11px;font-weight:800;letter-spacing:2px;color:var(--muted);margin-bottom:16px}
.kick i{display:grid;place-items:center;min-width:34px;height:24px;padding:0 8px;background:var(--red);color:#fff;font-style:normal;font-family:var(--num);font-size:12px;letter-spacing:1px}
.kick-w{color:rgba(255,255,255,.75)}
.kick-w i{background:var(--gold);color:var(--ink)}
.sec-h h2{font-size:38px;font-weight:900;line-height:1.3;letter-spacing:1px}
.sec-sub{margin-top:14px;font-size:15.5px;color:var(--muted)}

/* 英雄区：左文 + 右真机嵌套 */
.hero{position:relative;background:#fff;padding:84px 0 96px;overflow:hidden;border-bottom:2px solid var(--ink)}
.hero-in{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.hero-l h1{font-size:62px;font-weight:900;letter-spacing:1px;line-height:1.15;margin:6px 0 20px}
.lead{font-size:15.5px;color:#41454d;max-width:520px}
.hero-acts{display:flex;gap:16px;margin:30px 0 22px;flex-wrap:wrap}
.hero-points{display:flex;gap:22px;flex-wrap:wrap}
.hero-points li{position:relative;padding-left:16px;font-size:13.5px;font-weight:700;color:#34383f}
.hero-points li::before{content:"";position:absolute;left:0;top:8px;width:7px;height:7px;background:var(--gold)}
.hero-points li:nth-child(2)::before{background:var(--red)}
.hero-points li:nth-child(3)::before{background:var(--ink)}

/* 英雄区右：真机嵌套（区别于前站虚拟面板） */
.hero-r{display:flex;justify-content:flex-end}
.hm{position:relative;width:min(100%,420px);height:560px}
.hm-wm{position:absolute;top:-30px;right:-14px;z-index:0;font-family:var(--num);font-size:200px;font-weight:700;line-height:1;color:transparent;-webkit-text-stroke:3px rgba(19,20,23,.08);user-select:none;pointer-events:none}
.hm-gold{position:absolute;top:24px;left:0;width:62%;height:78%;background:var(--gold);border:2px solid var(--ink)}
.hm-red{position:absolute;bottom:0;right:6px;width:58%;height:46%;background:var(--red);border:2px solid var(--ink)}
.hm-phone{position:absolute;top:64px;left:96px;z-index:3;width:262px;height:536px;background:#0b0c0f;border:3px solid var(--ink);border-radius:34px;padding:12px;box-shadow:14px 14px 0 rgba(19,20,23,.85)}
.hm-phone img{width:100%;height:100%;object-fit:cover;object-position:top;border-radius:22px}
.hm-notch{position:absolute;top:12px;left:50%;transform:translateX(-50%);width:86px;height:20px;background:#0b0c0f;border-radius:0 0 12px 12px;z-index:4}
.hm-free{position:absolute;top:16px;right:44px;z-index:4;background:var(--ink);color:#fff;font-size:14px;font-weight:900;letter-spacing:4px;padding:10px 12px 10px 16px;writing-mode:vertical-rl}
.hm-data{position:absolute;bottom:34px;left:30px;z-index:4;background:#fff;border:2px solid var(--ink);padding:14px 20px;box-shadow:6px 6px 0 var(--red)}
.hm-data b{display:block;font-family:var(--num);font-size:26px;font-weight:700;line-height:1.2}
.hm-data span{font-size:12px;color:var(--muted)}
.hm-dot{position:absolute;z-index:4;border-radius:50%;border:2px solid var(--ink)}
.hm-dot1{top:0;left:120px;width:22px;height:22px;background:var(--red)}
.hm-dot2{bottom:8px;right:26px;width:14px;height:14px;background:var(--gold)}

/* 数字带 */
.nums{background:var(--ink);padding:34px 0}
.nums-in{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;text-align:center}
.nums b{display:block;font-family:var(--num);font-size:34px;font-weight:700;color:var(--gold);line-height:1.2}
.nums span{font-size:13px;color:#a2a7b0;letter-spacing:2px}

/* 01 性能主张：四格线框 */
.pw-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:3px solid var(--ink);border-left:2px solid var(--ink)}
.pw{padding:34px 26px;border-right:2px solid var(--ink);border-bottom:2px solid var(--ink);background:#fff}
.pw b{display:inline-grid;place-items:center;width:54px;height:54px;background:var(--red);color:#fff;font-size:22px;font-weight:900;border:2px solid var(--ink);box-shadow:3px 3px 0 var(--ink);margin-bottom:18px}
.pw-g b{background:var(--gold);color:var(--ink)}
.pw h3{font-size:19px;font-weight:800;margin-bottom:8px}
.pw p{font-size:14px;color:var(--muted)}

/* 02 功能详解：zigzag 交替行 */
.zig{display:flex;flex-direction:column;gap:56px}
.zig-row{display:grid;grid-template-columns:300px 1fr;gap:44px;align-items:center}
.zig-row:nth-child(even){grid-template-columns:1fr 300px}
.zig-row:nth-child(even) .zig-img{order:2}
.zig-img{position:relative}
.zig-img img{border:2px solid var(--ink);height:420px;object-fit:cover;object-position:top}
.zig-row:nth-child(odd) .zig-img{box-shadow:-10px 10px 0 var(--gold)}
.zig-row:nth-child(even) .zig-img{box-shadow:10px 10px 0 var(--red)}
.zig-row:nth-child(odd) .zig-img::before{content:"";position:absolute;top:-10px;right:-10px;width:44px;height:44px;background:var(--red);border:2px solid var(--ink)}
.zig-row:nth-child(even) .zig-img::before{content:"";position:absolute;top:-10px;left:-10px;width:44px;height:44px;background:var(--gold);border:2px solid var(--ink)}
.zig-no{display:block;font-family:var(--num);font-size:15px;font-weight:700;letter-spacing:2px;color:var(--red);margin-bottom:10px}
.zig-row:nth-child(even) .zig-no{color:var(--gold-d)}
.zig-txt h3{font-size:26px;font-weight:900;letter-spacing:1px;margin-bottom:12px}
.zig-txt p{font-size:15px;color:#41454d;max-width:560px}

/* 03 界面画轴：横向长卷 scroll-snap */
#shots{border-bottom:12px solid var(--gold)}
.axis{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;padding:20px;background:#fff;border:2px solid var(--ink);box-shadow:-14px 14px 0 var(--red)}
.axis::before{content:"";position:absolute}
.ax{position:relative;flex:0 0 250px;scroll-snap-align:start;background:#fff;border:1px solid var(--line)}
.ax-h{display:flex;justify-content:space-between;padding:9px 12px;border-bottom:4px solid var(--gold);font-family:var(--num);font-size:10.5px;font-weight:700;letter-spacing:1.5px}
.ax:nth-child(even) .ax-h{border-bottom-color:var(--red)}
.ax img{width:100%;height:420px;object-fit:cover;object-position:top}
.ax figcaption{padding:12px;font-size:13px;font-weight:700}

/* 04 FAQ：左深色块 + 右问答列 */
.fq-grid{display:grid;grid-template-columns:300px 1fr;gap:0;border:2px solid var(--ink)}
.fq-side{position:relative;background:var(--ink);color:#fff;padding:40px 32px}
.fq-side b{display:block;font-family:var(--num);font-size:40px;font-weight:700;color:var(--gold);line-height:1}
.fq-side p{margin-top:18px;font-size:13px;color:#a2a7b0;line-height:2}
.fq-seal{position:absolute;bottom:-2px;right:-2px;width:72px;height:72px;background:#fff;border:2px solid var(--ink);display:grid;place-items:center}
.fq-seal img{width:52px;height:52px}
.fq-col{background:#fff}
.fq{border-top:1px solid var(--line)}
.fq:first-child{border-top:none}
.fq-t{display:flex;align-items:center;gap:14px;width:100%;padding:18px 24px;background:none;border:none;cursor:pointer;font-family:var(--sans);font-size:15.5px;font-weight:700;color:var(--ink);text-align:left}
.fq-t span{flex:none;font-family:var(--num);font-size:14px;color:var(--red)}
.fq:nth-child(even) .fq-t span{color:var(--gold-d)}
.fq-i{position:relative;flex:none;width:16px;height:16px;margin-left:auto}
.fq-i::before,.fq-i::after{content:"";position:absolute;background:var(--ink);transition:transform .2s ease}
.fq-i::before{left:0;top:7px;width:16px;height:2px}
.fq-i::after{left:7px;top:0;width:2px;height:16px}
.fq.open{background:#fff9ef}
.fq.open .fq-t span{color:var(--red)}
.fq.open .fq-i::after{transform:rotate(90deg)}
.fq-a{display:none;padding:0 24px 20px 60px}
.fq.open .fq-a{display:block}
.fq-a p{font-size:14.5px;color:#41454d}

/* 05 读者批注：横幅信纸交错 */
.nt-wall{display:flex;flex-direction:column;gap:20px}
.nt{position:relative;width:88%;background:#fff;border:1px solid var(--line);border-top:4px solid var(--red);padding:22px 24px 16px;box-shadow:-8px 8px 0 var(--alt),-8px 8px 0 2px var(--line)}
.nt-r{align-self:flex-end;border-top-color:var(--gold);box-shadow:8px 8px 0 var(--alt),8px 8px 0 2px var(--line)}
.nt-no{position:absolute;top:-14px;left:20px;background:var(--ink);color:#fff;font-family:var(--num);font-size:10.5px;font-weight:700;letter-spacing:2px;padding:4px 10px}
.nt-r .nt-no{background:var(--red)}
.nt p{font-size:14px;color:#3a3e46}
.nt footer{display:flex;justify-content:space-between;align-items:center;margin-top:14px;padding-top:10px;border-top:1px dashed var(--line);font-size:12px;color:var(--muted)}
.nt footer b{color:var(--ink)}
.nt footer time{font-family:var(--num)}

/* 06 下载横幅 */
.get{background:#fff;padding:96px 0}
.get-in{position:relative;background:var(--ink);color:#fff;text-align:center;padding:64px 32px 58px;border:2px solid var(--ink)}
.get-in::before{content:"";position:absolute;top:-2px;left:-2px;width:36%;height:12px;background:var(--red)}
.get-in::after{content:"";position:absolute;bottom:-2px;right:-2px;width:36%;height:12px;background:var(--gold)}
.get-in h2{font-size:40px;font-weight:900;letter-spacing:2px;margin:8px 0 12px}
.get-in p{font-size:15px;color:#a2a7b0;margin-bottom:32px}
.btn-get{background:var(--red);color:#fff;padding:17px 46px;font-size:17px;box-shadow:6px 6px 0 var(--gold)}
.btn-get:hover{transform:translate(3px,3px);box-shadow:3px 3px 0 var(--gold);background:var(--red-d)}
.get-note{display:block;margin-top:16px;font-size:12.5px;color:#7c818a;letter-spacing:1px}

/* 页脚 */
.ft{background:#0d0e11;color:#fff;border-top:10px solid var(--red)}
.ft-in{display:grid;grid-template-columns:1.4fr 1fr .6fr;gap:44px;padding:56px 24px 40px}
.ft-brand p{margin-top:16px;font-size:13.5px;color:#8f949d;max-width:340px}
.ft .brand-t small{color:#8f949d}
.ft-nav{display:flex;flex-direction:column;gap:10px}
.ft-nav a,.ft-links a{font-size:13.5px;color:#c4c8cf}
.ft-nav a:hover,.ft-links a:hover{color:var(--gold)}
.ft-links{display:flex;flex-direction:column;gap:10px}
.ft-icp{padding:0 24px 10px;font-size:12.5px;color:#767b84}
.ft-icp a{color:#767b84}
.ft-icp a:hover{color:#fff}
.ft-c{padding:0 24px 30px;font-size:12.5px;color:#767b84}

/* 返回顶部 */
.backtop{position:fixed;right:26px;bottom:26px;z-index:60;width:46px;height:46px;background:var(--gold);color:var(--ink);border:2px solid var(--ink);font-size:20px;font-weight:900;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .2s ease,transform .2s ease,visibility .2s}
.backtop.on{opacity:1;visibility:visible;transform:none}

/* 入场动画 */
.rv{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .rv{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* 响应式 */
@media (max-width:1024px){
  .hero-l h1{font-size:50px}
  .pw-grid{grid-template-columns:repeat(2,1fr)}
  .zig-row,.zig-row:nth-child(even){grid-template-columns:1fr;gap:26px}
  .zig-row:nth-child(even) .zig-img{order:0}
  .zig-img img{height:380px}
  .fq-grid{grid-template-columns:1fr}
  .fq-side{padding:36px 28px 88px}
  .hm{width:min(100%,380px);height:540px}
  .hm-phone{left:70px}
}
@media (max-width:760px){
  .sec{padding:64px 0}
  .sec-h h2{font-size:28px}
  .hd-in{height:64px;gap:14px}
  .nav{position:fixed;top:64px;right:0;z-index:49;display:none;flex-direction:column;gap:0;background:#fff;border:2px solid var(--ink);border-right:none;padding:8px 0}
  .nav.open{display:flex}
  .nav a{padding:12px 28px;border-bottom:1px solid var(--line)}
  .burger{display:flex}
  .hd-cta{padding:8px 16px;font-size:13px}
  .hero{padding:44px 0 72px}
  .hero-in{grid-template-columns:1fr;gap:56px}
  .hero-l h1{font-size:38px}
  .hero-r{justify-content:center}
  .hm{width:min(100%,320px);height:470px;transform:scale(.94);transform-origin:top center}
  .hm-phone{width:216px;height:442px;top:44px;left:64px}
  .hm-wm{font-size:130px;top:-16px}
  .hm-data{bottom:20px;left:14px;padding:10px 14px}
  .hm-data b{font-size:20px}
  .hm-free{top:6px;right:24px;font-size:12px;padding:8px 10px 8px 13px}
  .nums b{font-size:26px}
  .pw-grid{grid-template-columns:1fr}
  .zig-row .zig-img img{height:340px}
  .axis{box-shadow:none;padding:14px;gap:12px}
  .ax{flex-basis:74%}
  .ax img{height:360px}
  .fq-t{padding:16px 18px;font-size:14.5px}
  .fq-a{padding:0 18px 18px 50px}
  .nt{width:100%}
  .nt-r{align-self:auto}
  .get-in{padding:48px 22px 44px}
  .get-in h2{font-size:28px}
  .ft-in{grid-template-columns:1fr;gap:28px;padding:44px 24px 28px}
}