/* 笔书阁 mmser.cn · 黑白红蓝 四色简约编辑风 */
:root{
  --black:#111214;
  --white:#ffffff;
  --blue:#145dff;
  --blue-d:#0f46c8;
  --blue-l:#6ea8ff;
  --red:#e02020;
  --gray:#585d66;
  --hair:#e3e5e9;
  --soft:#f5f6f8;
  --sans:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{font-family:var(--sans);color:var(--black);background:var(--white);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
ul,ol{list-style:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
h1,h2,h3,.brand-t strong{font-weight:800}

/* ---------- 按钮 ---------- */
.btn{display:inline-block;font-weight:700;border:2px solid var(--black);padding:10px 24px;transition:background .18s ease,border-color .18s ease,color .18s ease;white-space:nowrap}
.btn-pri{background:var(--blue);border-color:var(--blue);color:#fff}
.btn-pri:hover{background:var(--blue-d);border-color:var(--blue-d)}
.btn-line{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.btn-line:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.btn-ink{background:var(--black);border-color:var(--black);color:#fff}
.btn-ink:hover{background:var(--blue);border-color:var(--blue)}
.btn-lg{padding:15px 34px;font-size:17px}

/* ---------- 顶栏 ---------- */
.hd{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--hair)}
.hd-in{display:flex;align-items:center;gap:28px;height:72px}
.brand{display:flex;align-items:center;gap:12px;flex:none}
.brand img{width:40px;height:40px;border:2px solid var(--black);border-radius:9px}
.brand-t{display:flex;flex-direction:column;line-height:1.25}
.brand-t strong{font-size:20px}
.brand-t small{font-size:11px;color:var(--gray)}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{padding:8px 4px;margin:0 9px;font-size:15px;color:var(--black);border-bottom:2px solid transparent}
.nav a:hover{color:var(--blue)}
.nav a.on{color:var(--blue);border-color:var(--blue)}
.hd-r{display:flex;align-items:center;gap:12px}
.hd .hd-cta{padding:8px 20px;font-size:15px;border-width:2px}
.burger{display:none;width:42px;height:42px;background:#fff;border:2px solid var(--black);cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.burger span{width:20px;height:2px;background:var(--black);transition:.25s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 英雄区（平直黑） ---------- */
.hero{background:var(--black);color:#fff;padding:96px 0 100px;border-bottom:4px solid var(--blue)}
.hero-in{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.kick{display:flex;align-items:center;gap:10px;font-size:13px;letter-spacing:3px;font-weight:700;color:var(--blue)}
.kick-seal{font-style:normal;font-size:12px;letter-spacing:2px;background:var(--blue);color:#fff;padding:3px 10px}
.hero h1{font-size:76px;line-height:1.08;margin:18px 0 20px;letter-spacing:5px}
.lead{color:rgba(255,255,255,.72);max-width:560px}
.hero-acts{display:flex;gap:16px;margin:32px 0 26px;flex-wrap:wrap}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px}
.hero-tags li{font-size:13px;color:rgba(255,255,255,.8);border:1px solid rgba(255,255,255,.28);padding:4px 14px;transition:border-color .18s ease,color .18s ease}
.hero-tags li:hover{border-color:var(--blue);color:#fff}
.hero-note{margin-top:24px;font-size:14px;color:rgba(255,255,255,.6);display:flex;align-items:center;gap:9px}
.hero-note b{color:#fff}
.dot{flex:none;width:9px;height:9px;background:var(--red);animation:pulse 2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 10px rgba(224,32,32,0)}100%{box-shadow:0 0 0 0 rgba(224,32,32,0)}}
.hero-r{position:relative;display:flex;justify-content:center}
.hero-r::before{content:"";position:absolute;top:50%;left:50%;width:540px;height:540px;transform:translate(-50%,-50%);background:radial-gradient(closest-side,rgba(20,93,255,.26),transparent 72%);pointer-events:none}
.phone{position:relative;z-index:2;width:320px;background:#000;border:1px solid rgba(255,255,255,.32);border-radius:46px;padding:12px;box-shadow:0 44px 90px rgba(0,0,0,.55)}
.phone::after{content:"";position:absolute;right:-4px;top:120px;width:3px;height:58px;border-radius:2px;background:rgba(255,255,255,.35)}
.phone-cam{position:absolute;top:22px;left:50%;transform:translateX(-50%);width:10px;height:10px;border-radius:50%;background:#191b1f;border:1px solid rgba(255,255,255,.22);z-index:2}
.phone img{width:100%;border-radius:34px}
.ph-tag{position:absolute;top:34px;right:0;z-index:3;background:var(--red);color:#fff;font-size:12px;font-weight:700;letter-spacing:2px;padding:6px 12px}
.ph-card{position:absolute;left:0;bottom:64px;z-index:3;background:#fff;padding:14px 18px;border-left:3px solid var(--blue)}
.ph-card b{display:block;font-size:22px;font-weight:800;color:var(--blue)}
.ph-card span{font-size:12px;color:var(--gray)}

/* ---------- 区块通用 ---------- */
.sec{padding:88px 0}
.sec-tint{background:var(--soft)}
.sec-h{margin-bottom:48px;max-width:720px}
.sec-h .kick{color:var(--blue)}
.sec-h h2{font-size:38px;margin:14px 0;letter-spacing:2px}
.sec-p{color:var(--gray)}

/* ---------- 藏书分区（细线网格） ---------- */
#cats{border-bottom:4px solid var(--blue)}
.cats{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:1px;background:var(--black);border:1px solid var(--black)}
.cat{background:#fff;padding:26px;display:flex;flex-direction:column;gap:10px;transition:background .18s ease}
.cat:hover{background:#eef3ff}
.cat-no{font-size:13px;font-weight:800;letter-spacing:3px;color:var(--blue)}
.cat h3{font-size:22px;letter-spacing:1px}
.cat p{font-size:14px;color:var(--gray)}
.cat-ct{margin-top:auto;font-size:13px;font-weight:700;color:var(--blue)}
.cat-big{grid-row:span 2;background:var(--black);color:#fff}
.cat-big:hover{background:#1b1d22}
.cat-big .cat-no{color:var(--blue-l)}
.cat-big h3{color:#fff;font-size:32px}
.cat-big p{color:rgba(255,255,255,.65);font-size:15px}
.cat-hot{display:flex;flex-direction:column;gap:8px;margin:8px 0 4px}
.cat-hot li{font-size:15px;color:#fff;border-bottom:1px solid rgba(255,255,255,.2);padding-bottom:8px}
.cat-big .cat-ct{color:var(--blue-l)}
.cat-wide{grid-column:1/-1;flex-direction:row;align-items:center;gap:26px;background:var(--blue)}
.cat-wide:hover{background:var(--blue-d)}
.cat-wide .cat-no,.cat-wide h3,.cat-wide .cat-ct{color:#fff}
.cat-wide p{color:rgba(255,255,255,.85);flex:1;min-width:220px}
.cat-wide .cat-ct{white-space:nowrap}

/* ---------- 阁内榜单 ---------- */
.rank{display:grid;grid-template-columns:.92fr 1.08fr;gap:28px;align-items:stretch}
.rank-top{position:relative;background:var(--black);color:#fff;padding:38px 34px;display:flex;flex-direction:column;gap:12px}
.rt-seal{position:absolute;top:20px;right:20px;background:var(--red);color:#fff;font-size:13px;font-weight:700;letter-spacing:3px;padding:5px 12px}
.rt-no{font-size:52px;font-weight:800;line-height:1;color:transparent;-webkit-text-stroke:1.5px var(--blue)}
.rank-top h3{font-size:32px;color:#fff;letter-spacing:3px}
.rt-meta{font-size:13.5px;color:var(--blue-l)}
.rt-desc{font-size:14.5px;color:rgba(255,255,255,.65)}
.rt-score{margin-top:auto;align-self:flex-start;font-size:18px;font-weight:800;color:var(--blue-l);border:2px solid var(--blue-l);padding:3px 16px}
.rank-list{display:flex;flex-direction:column;gap:12px}
.rank-list li{display:flex;align-items:center;gap:16px;background:#fff;border:1px solid var(--hair);padding:16px 20px;transition:border-color .18s ease}
.rank-list li:hover{border-color:var(--black)}
.rk-no{font-size:26px;font-weight:800;color:#c3c7cf;flex:none;width:44px;text-align:center;transition:color .18s ease}
.rank-list li:hover .rk-no{color:var(--blue)}
.rk-m{flex:1;min-width:0}
.rk-m b{font-size:17px;display:block}
.rk-m small{color:var(--gray);font-size:12.5px}
.rk-tag{flex:none;font-size:12px;border:1px solid var(--hair);color:var(--gray);padding:2px 10px}
.rk-tag.hot{background:var(--red);border-color:var(--red);color:#fff}
.rk-sc{flex:none;font-size:20px;font-weight:800;color:var(--blue)}

/* ---------- 界面长卷 ---------- */
.roll{display:flex;gap:20px;max-width:1180px;margin:0 auto;background:#fff;border:1px solid var(--black);padding:20px}
.roll-i{flex:1 1 0;min-width:0;background:#fff;border:1px solid var(--hair);display:flex;flex-direction:column}
.rl-h{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;border-bottom:3px solid var(--blue);font-size:10px;font-weight:700;letter-spacing:2px}
.roll-i:nth-child(even) .rl-h{border-bottom-color:var(--black)}
.roll-i img{width:100%;border-bottom:1px solid var(--hair)}
.roll-i figcaption{text-align:center;font-size:14px;letter-spacing:3px;padding:12px 0}
.roll-tip{text-align:center;color:var(--gray);font-size:13px;padding-top:18px}

/* ---------- 数字绸带 ---------- */
.band{background:var(--blue);padding:44px 0}
.band-in{display:grid;grid-template-columns:repeat(4,1fr)}
.bd{text-align:center;color:#fff;padding:6px 10px}
.bd+.bd{border-left:1px solid rgba(255,255,255,.35)}
.bd b{display:block;font-size:38px;font-weight:800;line-height:1.2}
.bd span{font-size:14px;color:rgba(255,255,255,.85)}

/* ---------- 入阁指南（四格细线） ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--black);border:1px solid var(--black)}
.step{background:#fff;padding:26px 24px}
.st-seal{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;background:var(--blue);color:#fff;font-weight:800;font-size:15px;margin-bottom:14px}
.st-card h3{font-size:19px;letter-spacing:1px;margin-bottom:8px}
.st-card p{font-size:14px;color:var(--gray)}

/* ---------- FAQ 双列 ---------- */
.faqs{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:start}
.fq{background:#fff;border:1px solid var(--hair);transition:border-color .18s ease}
.fq[open]{border-color:var(--black)}
.fq summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:13px;padding:19px 20px;font-size:16px;font-weight:700;letter-spacing:1px}
.fq summary::-webkit-details-marker{display:none}
.fq-seal{flex:none;width:34px;height:34px;background:var(--blue);color:#fff;font-size:14px;display:flex;align-items:center;justify-content:center}
.fq-q{flex:1}
.fq-ic{flex:none;position:relative;width:16px;height:16px}
.fq-ic::before,.fq-ic::after{content:"";position:absolute;background:var(--black);transition:transform .2s ease,opacity .2s ease}
.fq-ic::before{left:0;top:7px;width:16px;height:2px}
.fq-ic::after{left:7px;top:0;width:2px;height:16px}
.fq[open] .fq-ic::after{transform:rotate(90deg);opacity:0}
.fq-a{padding:0 20px 22px 67px}
.fq-a p{font-size:14.5px;color:var(--gray);border-top:1px solid var(--hair);padding-top:14px}

/* ---------- 书友留言（三列瀑布流） ---------- */
.notes{max-width:1180px;margin:0 auto;columns:3;column-gap:20px}
.note{display:inline-block;width:100%;margin:0 0 20px;background:#fff;border:1px solid var(--hair);border-left:3px solid var(--blue);padding:24px 26px 18px;break-inside:avoid}
.note:nth-child(3n+2){border-left-color:var(--black)}
.note p{font-size:15px}
.note p::before{content:"“";display:block;font-family:Georgia,"Times New Roman",serif;font-size:44px;line-height:.5;color:var(--blue);margin:10px 0 14px}
.note footer{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:14px;border-top:1px solid var(--hair);padding-top:12px}
.note footer b{letter-spacing:1px}
.note footer time{font-size:12.5px;color:var(--gray)}

/* ---------- 官方下载 ---------- */
.get{background:var(--black);padding:110px 24px 120px}
.get-plaque{max-width:660px;margin:0 auto;background:#fff;padding:0 44px 40px;text-align:center}
.get-logo{width:84px;height:84px;margin:-46px auto 20px;border:2px solid var(--black);border-radius:18px;background:#fff}
.get-plaque .kick{justify-content:center}
.get-plaque h2{font-size:36px;letter-spacing:3px;margin:12px 0 14px}
.get-p{color:var(--gray);max-width:480px;margin:0 auto 28px}
.get-p b{color:var(--black)}
.get-upd{margin-top:22px;font-size:12.5px;color:var(--gray)}

/* ---------- 页脚 ---------- */
.ft{background:#0b0c0e;color:rgba(255,255,255,.72);border-top:4px solid var(--blue);padding:66px 0 0}
.ft-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:44px}
.ft-brand{display:flex;gap:12px;align-items:center;margin-bottom:14px}
.ft-brand img{width:36px;height:36px;border:2px solid var(--blue);border-radius:8px}
.ft-brand b{color:#fff;font-size:18px;letter-spacing:2px;display:block}
.ft-brand p{font-size:12.5px;color:rgba(255,255,255,.5)}
.ft-note{font-size:13.5px;color:rgba(255,255,255,.55);max-width:380px}
.ft-col h4{color:#fff;font-size:16px;letter-spacing:2px;margin-bottom:14px}
.ft-col li{margin-bottom:9px}
.ft-col a{font-size:14px;color:rgba(255,255,255,.62)}
.ft-col a:hover{color:var(--blue)}
.ft-copy{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;text-align:center;font-size:13px;color:rgba(255,255,255,.45)}
.ft-copy p+p{margin-top:4px}

/* ---------- 返回顶部 ---------- */
.backtop{position:fixed;right:24px;bottom:24px;z-index:55;width:46px;height:46px;background:var(--blue);color:#fff;font-size:20px;border:none;cursor:pointer;opacity:0;transform:translateY(14px);pointer-events:none;transition:opacity .25s ease,transform .25s ease,background .18s ease}
.backtop.show{opacity:1;transform:none;pointer-events:auto}
.backtop:hover{background:var(--blue-d)}

/* ---------- 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}
  .dot{animation:none}
  html{scroll-behavior:auto}
}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .sec{padding:72px 0}
  .sec-h h2{font-size:32px}
  .hero{padding:64px 0 80px}
  .hero-in{grid-template-columns:1fr;gap:48px}
  .hero h1{font-size:54px}
  .cats{grid-template-columns:1fr 1fr}
  .cat-big{grid-row:span 1;grid-column:1/-1}
  .rank{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .faqs{grid-template-columns:1fr}
  .notes{columns:2}
  .ft-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:760px){
  .burger{display:flex}
  .nav{position:absolute;top:72px;left:0;right:0;display:none;flex-direction:column;background:#fff;border-bottom:2px solid var(--black);padding:10px 18px 16px;gap:2px;margin:0}
  .nav.open{display:flex}
  .nav a{padding:11px 4px;margin:0;border-bottom:1px solid var(--hair)}
  .nav a.on{background:var(--soft)}
  .hd .hd-cta{padding:7px 14px;font-size:14px}
  .band-in{grid-template-columns:1fr 1fr;gap:22px 0}
  .bd:nth-child(3){border-left:none}
}
@media (max-width:640px){
  body{font-size:15px}
  .hero{padding:52px 0 72px}
  .hero h1{font-size:44px;letter-spacing:3px}
  .phone{width:272px}
  .ph-tag{top:18px}
  .ph-card{bottom:26px;padding:10px 14px}
  .ph-card b{font-size:18px}
  .cats{grid-template-columns:1fr}
  .cat-wide{flex-direction:column;align-items:flex-start;gap:12px}
  .steps{grid-template-columns:1fr}
  .roll{justify-content:flex-start;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch}
  .roll-i{flex:0 0 236px;scroll-snap-align:center}
  .notes{columns:1}
  .get{padding:96px 16px 104px}
  .get-plaque{padding:0 24px 32px}
  .get-plaque h2{font-size:30px}
  .ft-grid{grid-template-columns:1fr;gap:26px}
  .backtop{right:16px;bottom:16px}
}