/* 海棠书城 mmsph.cn — 黑/白/海棠红/黛蓝 四色 · 错落阴影工艺 */
:root{
  --ink:#141519;
  --paper:#ffffff;
  --gray:#f5f6f8;
  --line:#e3e5e9;
  --muted:#6b7280;
  --red:#e62b2b;
  --blue:#1e63d0;
  --sans:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --num:Georgia,"Times New Roman",serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.75;-webkit-font-smoothing:antialiased}
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)}
::selection{background:var(--red);color:#fff}

/* 顶栏 */
.hd{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.hd-in{display:flex;align-items:center;gap:34px;height:72px}
.brand{display:flex;align-items:center;gap:12px;min-width:max-content}
.brand img{width:40px;height:40px}
.brand-t{display:flex;flex-direction:column;line-height:1.25}
.brand-t strong{font-size:19px;font-weight:900;letter-spacing:1px}
.brand-t small{font-size:11px;color:var(--muted)}
.nav{display:flex;gap:26px;flex:1;justify-content:center}
.nav a{font-size:14px;font-weight:600;color:#3d434c;padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a.on{color:var(--red);border-bottom-color:var(--red)}
.hd-r{display:flex;align-items:center;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;font-weight:800;cursor:pointer;transition:transform .16s ease,box-shadow .16s ease,background .16s ease}
.btn-pri{background:var(--red);color:#fff;border:2px solid var(--ink)}
.hd-cta{min-height:40px;padding:0 18px;font-size:14px;box-shadow:2px 2px 0 var(--ink)}
.hd-cta:hover{transform:translate(1px,1px);box-shadow:1px 1px 0 var(--ink)}
.burger{display:none;width:42px;height:40px;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)}

/* 通用区块头 */
.sec{padding:96px 0}
.sec-gray{background:var(--gray)}
.sec-h{max-width:640px;margin-bottom:48px}
.kick{display:flex;align-items:center;gap:10px;font-size:12px;font-weight:800;letter-spacing:2.5px;color:var(--muted);margin-bottom:16px}
.kick i{display:grid;place-items:center;min-width:32px;height:24px;padding:0 6px;background:var(--red);color:#fff;font-style:normal;font-weight:900;letter-spacing:1px}
.sec-h h2{font-size:38px;line-height:1.25;font-weight:900;letter-spacing:.5px;margin-bottom:14px}
.sec-p{color:var(--muted);font-size:15.5px}
.kick-w{color:rgba(255,255,255,.8)}
.kick-w i{background:#fff;color:var(--red)}

/* 01 英雄区 */
.hero{padding:88px 0 100px;border-bottom:1px solid var(--line);overflow:hidden}
.hero-in{display:grid;grid-template-columns:.92fr 1.08fr;gap:56px;align-items:center}
.hero-l h1{font-size:66px;font-weight:900;letter-spacing:3px;line-height:1.1;margin-bottom:22px}
.lead{color:#3d434c;font-size:16px;max-width:600px;margin-bottom:30px}
.hero-acts{display:flex;flex-wrap:wrap;gap:14px}
.btn-lg{min-height:62px;padding:0 26px;font-size:17px;gap:14px}
.hero-acts .btn-pri{box-shadow:6px 6px 0 var(--blue)}
.hero-acts .btn-pri:hover{transform:translate(2px,2px);box-shadow:4px 4px 0 var(--blue)}
.btn-ic{display:grid;place-items:center;width:38px;height:38px;background:var(--ink);color:#fff;font-size:18px;font-weight:900}
.btn-line{background:#fff;color:var(--ink);border:2px solid var(--ink)}
.btn-line:hover{background:var(--gray)}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);margin-top:36px;max-width:600px}
.hero-stats li{padding:14px 0 0}
.hero-stats li+li{border-left:1px solid var(--line);padding-left:18px}
.hero-stats b{display:block;font-size:23px;font-weight:900;color:var(--red);line-height:1.2}
.hero-stats span{font-size:12px;color:var(--muted)}
.hero-note{display:flex;align-items:center;gap:9px;margin-top:24px;font-size:13px;color:var(--muted)}
.dot{width:8px;height:8px;background:var(--red);flex:none;animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}

/* 英雄区右视觉：虚拟界面面板 + 装订环/角标/徽章/色板/水印点缀 */
.hero-r{display:flex;justify-content:flex-end}
.hv{position:relative;width:min(100%,560px)}
.hv-wm{position:absolute;right:-24px;bottom:-58px;z-index:0;font-size:120px;font-weight:900;letter-spacing:6px;color:transparent;-webkit-text-stroke:2px rgba(20,21,25,.09);user-select:none;pointer-events:none}
.hv-back{position:absolute;top:16px;right:-16px;bottom:-16px;left:30px;z-index:1;background:var(--blue);border:2px solid var(--ink)}
.hv-panel{position:relative;z-index:2;background:#fff;border:2px solid var(--ink);box-shadow:16px 16px 0 var(--red)}
.hv-rings{position:absolute;top:-15px;left:28px;right:172px;z-index:3;display:flex;justify-content:space-between}
.hv-rings i{width:12px;height:30px;border:3px solid var(--ink);border-radius:7px;background:#fff}
.hv-top{display:flex;justify-content:space-between;align-items:center;gap:12px;background:var(--red);color:#fff;font-size:11px;font-weight:800;letter-spacing:2px;padding:12px 16px;margin-top:16px}
.hv-body{display:grid;grid-template-columns:96px 1fr 152px;gap:18px;padding:24px 22px 26px;align-items:start}
.hv-ver small,.hv-list small{display:block;font-size:9px;font-weight:800;letter-spacing:2px;color:var(--muted);margin-bottom:6px}
.hv-ver b{display:block;font-family:var(--num);font-size:56px;font-weight:700;line-height:1;color:var(--blue)}
.hv-tag{display:inline-block;margin-top:10px;background:var(--red);color:#fff;font-size:10px;font-weight:800;letter-spacing:1px;padding:3px 8px}
.hv-shot{border:2px solid var(--ink)}
.hv-shot img{width:100%;height:200px;object-fit:cover;object-position:top}
.hv-list ul li{position:relative;font-size:12.5px;font-weight:600;padding:8px 0 8px 14px;border-bottom:1px solid var(--line)}
.hv-list ul li:last-child{border-bottom:none}
.hv-list ul li::before{content:"";position:absolute;left:0;top:14px;width:6px;height:6px;background:var(--red)}
.hv-list ul li:nth-child(2)::before{background:var(--blue)}
.hv-foot{display:flex;align-items:center;gap:14px;border-top:1px solid var(--line);padding:0 16px 0 0;font-size:12.5px;color:var(--muted);letter-spacing:.5px;min-height:50px}
.hv-next{display:grid;place-items:center;flex:none;width:76px;height:50px;background:var(--ink);color:#fff;font-size:10px;font-weight:800;letter-spacing:1px}
.hv-seal{position:absolute;right:18px;bottom:18px;z-index:3;width:68px;height:68px;border-radius:50%;border:2px solid var(--ink);background:#fff;display:grid;place-items:center}
.hv-seal img{width:48px;height:48px;border-radius:50%}
.hv-seal span{position:absolute;bottom:-5px;right:-10px;background:var(--red);color:#fff;font-size:9px;font-weight:800;letter-spacing:1px;padding:2px 6px}
.hv-badge{position:absolute;left:84px;bottom:-14px;z-index:4;background:var(--ink);color:#fff;font-size:12px;font-weight:800;letter-spacing:2px;padding:8px 14px}
.hv-stat{position:absolute;top:-30px;right:-16px;z-index:4;background:var(--blue);color:#fff;border:2px solid var(--ink);padding:16px 20px;box-shadow:6px 6px 0 var(--ink)}
.hv-stat b{display:block;font-size:26px;font-weight:900;line-height:1.2}
.hv-stat span{font-size:12px;color:rgba(255,255,255,.85)}

/* 02 功能矩阵：容器蓝影 + 顶部半红半蓝条 */
.feats{position:relative;display:grid;grid-template-columns:repeat(3,1fr);border:2px solid var(--ink);background:#fff;padding-top:10px;box-shadow:-14px 14px 0 var(--blue)}
.feats::before{content:"";position:absolute;top:0;left:0;width:50%;height:10px;background:var(--red)}
.feats::after{content:"";position:absolute;top:0;right:0;width:50%;height:10px;background:var(--blue)}
.ft-i{padding:30px 28px 34px;border-top:1px solid var(--line);border-left:1px solid var(--line);transition:background .18s ease}
.ft-i:nth-child(3n+1){border-left:none}
.ft-i:nth-child(-n+3){border-top:none}
.ft-i:hover{background:var(--gray)}
.ft-no{font-family:var(--num);font-size:13px;font-weight:700;letter-spacing:2px;color:var(--blue);display:block;margin-bottom:12px}
.ft-i:nth-child(even) .ft-no{color:var(--red)}
.ft-i h3{font-size:19px;font-weight:800;margin-bottom:8px}
.ft-i p{font-size:13.5px;color:var(--muted)}

/* 03 界面长廊：容器黑影 + 区块底边蓝条 */
#shots{border-bottom:12px solid var(--blue)}
.shots{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;border:2px solid var(--ink);background:#fff;padding:18px;box-shadow:18px 18px 0 var(--ink)}
.st{border:1px solid var(--line);background:#fff;overflow:hidden}
.st header{display:flex;justify-content:space-between;align-items:center;padding:10px 13px;border-bottom:4px solid var(--red);font-size:10px;font-weight:900;letter-spacing:1.5px;color:var(--ink)}
.st:nth-child(even) header{border-bottom-color:var(--blue)}
.st header span:last-child{color:var(--muted)}
.st img{width:100%;aspect-ratio:9/16;object-fit:cover;object-position:top}
.st figcaption{padding:13px 14px;font-size:12.5px;font-weight:700;border-top:1px solid var(--line)}

/* 04 上手步骤：深色区 顶红边底蓝边 + 卡片错落 */
.sec-dark{background:var(--ink);border-top:6px solid var(--red);border-bottom:6px solid var(--blue);padding:96px 0;color:#fff}
.sec-h-dark h2{color:#fff}
.sec-h-dark .sec-p{color:rgba(255,255,255,.6)}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.sp{background:#fff;color:var(--ink);padding:28px 24px 32px;border-top:6px solid var(--red)}
.sp:nth-child(even){border-top-color:var(--blue);transform:translateY(26px)}
.sp-no{font-family:var(--num);font-size:36px;font-weight:700;color:var(--red);display:block;line-height:1;margin-bottom:14px}
.sp:nth-child(even) .sp-no{color:var(--blue)}
.sp h3{font-size:18px;font-weight:800;margin-bottom:8px}
.sp p{font-size:13px;color:var(--muted)}

/* 05 常见疑问：错位色块三层堆 */
.faq-wrap{position:relative;margin:10px 18px 18px 10px}
.faq-wrap::before{content:"";position:absolute;top:-18px;left:-18px;width:130px;height:130px;background:var(--red)}
.faq-wrap::after{content:"";position:absolute;bottom:-18px;right:-18px;width:170px;height:170px;background:var(--blue)}
.faq-box{position:relative;z-index:2;display:grid;grid-template-columns:250px 1fr;background:#fff;border:2px solid var(--ink)}
.faq-side{background:var(--ink);color:#fff;padding:36px 28px;display:flex;flex-direction:column;gap:14px}
.faq-side b{font-family:var(--num);font-size:36px;font-weight:700;line-height:1}
.faq-side p{font-size:12px;letter-spacing:2px;color:rgba(255,255,255,.6);line-height:1.9}
.faq-chip{width:20px;height:20px;background:var(--red);margin-top:8px}
.qa{border-top:1px solid var(--line)}
.qa:first-child{border-top:none}
.qa-q{display:flex;align-items:center;gap:16px;width:100%;padding:20px 24px;background:none;border:none;font:inherit;text-align:left;cursor:pointer}
.qa-q span{font-family:var(--num);font-size:13px;font-weight:700;letter-spacing:1px;color:var(--red);flex:none}
.qa:nth-child(even) .qa-q span{color:var(--blue)}
.qa-q strong{flex:1;font-size:16px;font-weight:800}
.qa-q i{position:relative;flex:none;width:16px;height:16px}
.qa-q i::before,.qa-q i::after{content:"";position:absolute;background:var(--ink);transition:transform .2s ease}
.qa-q i::before{left:0;top:7px;width:16px;height:2px}
.qa-q i::after{left:7px;top:0;width:2px;height:16px}
.qa.open .qa-q i::after{transform:rotate(90deg) scaleY(0)}
.qa-a{display:none;padding:0 24px 24px 65px}
.qa.open .qa-a{display:block}
.qa.open{background:rgba(230,43,43,.04);box-shadow:inset 4px 0 0 var(--red)}
.qa-a p{font-size:14px;color:#3d434c;max-width:640px}

/* 06 书友留言：三列错落 + 顶色条交替 */
.vcs{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding-bottom:28px}
.vc{position:relative;border:1px solid var(--ink);background:#fff;padding:30px 26px 22px;display:flex;flex-direction:column}
.vc::before{content:"";position:absolute;top:-1px;left:-1px;right:-1px;height:4px;background:var(--red)}
.vc:nth-child(even)::before{background:var(--blue)}
.vc:nth-child(3n+2){transform:translateY(28px)}
.vc p{font-size:14px;color:#3d434c;flex:1}
.vc p::before{content:"“";display:block;font-family:var(--num);font-size:44px;line-height:.8;color:var(--red);margin-bottom:10px}
.vc:nth-child(even) p::before{color:var(--blue)}
.vc footer{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);margin-top:18px;padding-top:14px;font-size:12px}
.vc footer b{font-weight:800}
.vc footer time{color:var(--muted)}

/* 07 下载带：红大底 + 白按钮黑影焦点 */
.get{background:var(--red);border-top:6px solid var(--ink);padding:72px 0;color:#fff}
.get-in{display:flex;align-items:center;justify-content:space-between;gap:48px}
.get-l{max-width:600px}
.get-l h2{font-size:36px;font-weight:900;letter-spacing:1px;margin-bottom:14px}
.get-l p{color:rgba(255,255,255,.85);font-size:15px}
.get-r{flex:none;text-align:center}
.get-btn{display:inline-flex;align-items:center;gap:16px;background:#fff;color:var(--ink);border:2px solid var(--ink);min-height:66px;padding:0 16px 0 30px;font-size:19px;font-weight:900;letter-spacing:1px;box-shadow:8px 8px 0 var(--ink);transition:transform .16s ease,box-shadow .16s ease}
.get-btn .btn-ic{background:var(--red);color:#fff}
.get-btn:hover{transform:translate(3px,3px);box-shadow:5px 5px 0 var(--ink)}
.get-sub{margin-top:16px;font-size:12px;letter-spacing:1px;color:rgba(255,255,255,.85)}

/* 页脚 */
.ft{background:var(--ink);color:#aab0ba;padding:64px 0 0}
.ft-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:44px;padding-bottom:44px}
.ft-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.ft-brand img{width:36px;height:36px}
.ft-brand b{display:block;color:#fff;font-size:17px;font-weight:800}
.ft-brand p{font-size:11.5px;color:rgba(255,255,255,.5)}
.ft-note{font-size:12.5px;color:rgba(255,255,255,.5);max-width:320px;line-height:1.9}
.ft-col h4{color:#fff;font-size:14px;font-weight:800;margin-bottom:14px}
.ft-col li{margin-bottom:9px}
.ft-col a{font-size:13px}
.ft-col a:hover{color:#fff}
.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:22px;bottom:22px;z-index:60;width:44px;height:44px;border:none;background:var(--ink);color:#fff;font-size:18px;cursor:pointer;display:none;box-shadow:3px 3px 0 var(--red)}
.backtop.show{display:block}

/* 入场动画 */
.rv{opacity:0;transform:translateY(24px);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:1024px){
  .hero-in{grid-template-columns:1fr;gap:56px}
  .hero-r{justify-content:center}
  .hero-l h1{font-size:52px}
  .feats{grid-template-columns:repeat(2,1fr)}
  .ft-i{border-left:none;border-top:1px solid var(--line)}
  .ft-i:nth-child(-n+2){border-top:none}
  .ft-i:nth-child(odd){border-left:none}
  .ft-i:nth-child(even){border-left:1px solid var(--line)}
  .shots{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .sp:nth-child(even){transform:none}
  .faq-box{grid-template-columns:1fr}
  .faq-side{flex-direction:row;align-items:center;justify-content:space-between;padding:20px 24px}
  .faq-side b{font-size:26px}
  .vcs{grid-template-columns:repeat(2,1fr)}
  .vc:nth-child(3n+2){transform:none}
  .get-in{flex-direction:column;text-align:center}
  .get-l{margin:0 auto}
  .sec-h{margin-left:auto;margin-right:auto;text-align:center}
  .kick{justify-content:center}
}
@media (max-width:760px){
  .nav{position:fixed;top:72px;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;gap:0;padding:8px 24px 16px;border-bottom:2px solid var(--ink);display:none}
  .nav.open{display:flex}
  .nav a{width:100%;padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
  .nav a:last-child{border-bottom:none}
  .burger{display:flex}
  .hd-cta{display:none}
  .sec,.sec-dark{padding:64px 0}
  .sec-h h2{font-size:28px}
  .hero{padding:56px 0 72px}
  .hero-l h1{font-size:42px}
  .hero-stats li+li{padding-left:12px}
  .hv{width:min(100%,330px)}
  .hv-panel{box-shadow:10px 10px 0 var(--red)}
  .hv-back{top:10px;right:-8px;bottom:-8px;left:16px}
  .hv-wm{font-size:54px;right:-6px;bottom:-30px;letter-spacing:2px}
  .hv-body{grid-template-columns:78px 1fr;gap:12px;padding:16px 14px 18px}
  .hv-list{grid-column:1/-1}
  .hv-list ul li{display:inline-block;border:none;padding:4px 10px 4px 14px;margin-right:6px}
  .hv-list ul li::before{top:11px}
  .hv-ver b{font-size:34px}
  .hv-shot img{height:128px}
  .hv-rings{top:-12px;left:18px;right:118px}
  .hv-rings i{width:9px;height:22px;border-width:2.5px}
  .hv-badge{top:auto;right:auto;left:80px;bottom:-12px}
  .hv-seal{width:50px;height:50px;right:12px;bottom:12px}
  .hv-seal img{width:34px;height:34px}
  .hv-stat{left:auto;bottom:auto;top:-24px;right:-4px;padding:10px 14px}
  .hv-stat b{font-size:19px}
  .feats{grid-template-columns:1fr;box-shadow:-8px 8px 0 var(--blue)}
  .ft-i:nth-child(-n+2){border-top:1px solid var(--line)}
  .ft-i:first-child{border-top:none}
  .ft-i:nth-child(even){border-left:none}
  .shots{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:12px;padding:14px;box-shadow:10px 10px 0 var(--ink);-webkit-overflow-scrolling:touch}
  .st{flex:0 0 76%;scroll-snap-align:start}
  .steps{grid-template-columns:1fr}
  .faq-wrap{margin:8px 8px 14px 8px}
  .faq-wrap::before{top:-10px;left:-10px;width:80px;height:80px}
  .faq-wrap::after{bottom:-10px;right:-10px;width:100px;height:100px}
  .qa-a{padding:0 20px 20px}
  .vcs{grid-template-columns:1fr;padding-bottom:0}
  .get{padding:56px 0}
  .get-l h2{font-size:27px}
  .get-btn{font-size:16px;min-height:58px;padding:0 12px 0 20px}
  .ft-grid{grid-template-columns:1fr 1fr;gap:30px}
}