:root{
  --wood:#3A2413;
  --wood-2:#2A1A0E;
  --wood-3:#1B0F07;
  --bark:#7A4A24;
  --bark-l:#C08A4E;
  --bark-d:#5A3518;
  --paper:#FBF6EB;
  --paper-2:#FFFCF4;
  --band:#F4E6CD;
  --line:#E5D0AE;
  --text:#3A2C1E;
  --muted:#7A674F;
  --red:#E01F12;
  --red-d:#A81209;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC",STSong,SimSun,Georgia,serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  color:var(--text);background:var(--paper);line-height:1.9;font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{line-height:1.35;font-weight:700}
.wrap{width:100%;max-width:1100px;margin:0 auto;padding:0 26px}

/* ============ 顶栏：深木底 ============ */
.top{
  position:sticky;top:0;z-index:90;
  background:rgba(30,18,10,.96);
  border-bottom:1px solid rgba(192,138,78,.28);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.top.on{box-shadow:0 10px 26px rgba(20,10,4,.34)}
.top-in{display:flex;align-items:center;height:70px;gap:18px}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand img{width:36px;height:36px;border:1px solid rgba(192,138,78,.5);border-radius:7px}
.brand-t b{
  display:block;font-family:var(--serif);font-size:18px;letter-spacing:3px;line-height:1.2;color:#FBEED6;
}
.brand-t small{display:block;font-size:10px;letter-spacing:1.4px;color:rgba(223,195,155,.72);margin-top:3px}
.nav{display:flex;gap:24px;margin-left:auto;font-size:13px;font-weight:600;color:#DFC39B}
.nav a{position:relative;padding:5px 0}
.nav a::after{
  content:"";position:absolute;left:0;right:100%;bottom:-1px;height:2px;background:var(--bark-l);
  transition:right .25s ease;
}
.nav a:hover{color:#FBEED6}
.nav a:hover::after{right:0}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;color:#FBEED6;padding:4px}
.cta{
  flex:none;background:var(--red);color:#fff;font-size:12.5px;font-weight:800;letter-spacing:.6px;
  padding:10px 20px;border-radius:3px;box-shadow:0 3px 0 var(--red-d);
}
.cta:hover{background:var(--red-d)}

/* ============ 英雄区：木屋与书架 ============ */
.hero{
  position:relative;overflow:hidden;padding:66px 0 72px;color:#F6E7CD;
  background:
    radial-gradient(640px 430px at 82% 4%,rgba(255,146,54,.26),transparent 70%),
    repeating-linear-gradient(0deg,rgba(255,214,160,.055) 0 1px,transparent 1px 132px),
    repeating-linear-gradient(90deg,rgba(255,214,160,.048) 0 1px,transparent 1px 118px),
    linear-gradient(174deg,#3A2413 0%,#241509 58%,#1B0F07 100%);
}
.hero::before{
  content:"";position:absolute;right:7%;top:-104px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,#FFC076 0%,rgba(255,150,60,.34) 46%,transparent 70%);
  opacity:.55;pointer-events:none;
}
.hero::after{
  content:"屋";position:absolute;left:-34px;bottom:-146px;font-family:var(--serif);
  font-size:400px;line-height:1;color:rgba(255,214,160,.04);pointer-events:none;
}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:center;position:relative;z-index:1}
.kick{
  display:inline-flex;align-items:center;gap:9px;font-size:11px;letter-spacing:3px;
  color:#E2B77F;margin-bottom:14px;
}
.kick::before{content:"";width:16px;height:2px;background:var(--bark-l)}
.hero h1{
  font-family:var(--serif);font-size:64px;letter-spacing:8px;line-height:1.1;
  margin-bottom:13px;color:#FDF3DF;font-weight:700;
}
.hero h1 span{color:#E9A45F}
.hero .lead{font-size:18.5px;font-weight:700;color:#F1DEBF;margin-bottom:12px}
.hero .desc{font-size:14.6px;color:rgba(246,231,205,.76);max-width:552px;margin-bottom:26px;line-height:2.02}
.acts{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.btn{
  display:inline-flex;align-items:center;gap:8px;background:var(--red);color:#fff;
  padding:13px 28px;border-radius:3px;font-weight:800;font-size:15px;
  box-shadow:0 4px 0 var(--red-d),0 12px 26px rgba(0,0,0,.32);
}
.btn svg{width:17px;height:17px}
.btn:hover{background:var(--red-d);transform:translateY(1px)}
.ghost{
  display:inline-flex;align-items:center;padding:12px 20px;border-radius:3px;
  border:1px solid rgba(192,138,78,.55);color:#E9C89A;font-size:13.5px;font-weight:700;
}
.ghost:hover{background:rgba(192,138,78,.14);border-color:var(--bark-l)}
.facts{
  display:flex;flex-wrap:wrap;margin-top:30px;padding-top:16px;
  border-top:1px solid rgba(240,210,160,.2);
}
.facts div{padding:0 20px;border-left:1px solid rgba(240,210,160,.16)}
.facts div:first-child{padding-left:0;border-left:0}
.facts b{display:block;font-size:12.5px;color:#F1DEBF;letter-spacing:.6px}
.facts span{display:block;font-size:11px;color:rgba(246,231,205,.52);margin-top:2px}

/* 书架陈设 */
.shelf{position:relative;display:grid;grid-template-columns:1.08fr .92fr;gap:18px;height:474px;z-index:1}
.shelf::before{
  content:"";position:absolute;inset:-34px -22px 6px;pointer-events:none;
  background:radial-gradient(58% 52% at 50% 18%,rgba(255,186,102,.26),transparent 72%);
}
.tag{
  position:absolute;top:-18px;left:-12px;z-index:6;
  background:linear-gradient(180deg,#E5AF69,#C08A4E);color:#3A2413;
  font-family:var(--serif);font-size:11.5px;letter-spacing:2px;padding:6px 13px;
  transform:rotate(-2.6deg);box-shadow:0 6px 14px rgba(0,0,0,.36);
}
.frame{
  position:relative;margin:0;padding:8px;
  background:linear-gradient(162deg,#A56D38,#6B411E 62%,#4A2B11);
  box-shadow:0 18px 38px rgba(0,0,0,.46),inset 0 1px 0 rgba(255,225,180,.3);
}
.frame img{position:absolute;left:8px;right:8px;top:8px;bottom:9px;width:calc(100% - 16px);height:calc(100% - 17px);object-fit:cover}
.frame::after{
  content:"";position:absolute;left:-9px;right:-9px;bottom:-9px;height:9px;
  background:linear-gradient(180deg,#C79055,#7A4A24 68%,#54300F);
  box-shadow:0 8px 16px rgba(0,0,0,.4);
}
.big{grid-row:1}
.side{display:grid;grid-template-rows:1fr 1fr;gap:19px}

/* ============ 通用区块 ============ */
.sec{
  padding:66px 0;background:var(--paper);
  background-image:repeating-linear-gradient(0deg,rgba(122,74,36,.022) 0 1px,transparent 1px 4px);
}
.band{
  background:var(--band);
  background-image:repeating-linear-gradient(90deg,rgba(122,74,36,.035) 0 1px,transparent 1px 96px);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.hd2{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:start;margin-bottom:34px}
.hd2 .no{
  display:inline-block;white-space:nowrap;font-family:"SFMono-Regular",Consolas,monospace;
  font-size:11px;letter-spacing:1.4px;color:#F7E5C4;
  background:linear-gradient(180deg,#8B5A2E,#5E3A1C);
  padding:8px 13px;border-radius:2px;box-shadow:0 2px 0 rgba(74,43,17,.4),inset 0 1px 0 rgba(255,225,180,.3);
}
.hd2 h2{font-family:var(--serif);font-size:31px;letter-spacing:2px;margin-bottom:7px;color:#2E2115}
.hd2 p{font-size:14.4px;color:var(--muted);max-width:820px}

/* 特色：木签卡片 */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{
  position:relative;background:linear-gradient(180deg,#FFFCF4,#F8F0DD);
  border:1px solid var(--line);border-radius:3px;padding:22px 20px 22px 24px;
  box-shadow:0 2px 0 rgba(122,74,36,.1);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:4px;border-radius:3px 0 0 3px;
  background:linear-gradient(180deg,var(--bark-l),var(--bark-d));
}
.card .n{
  display:inline-block;font-family:"SFMono-Regular",Consolas,monospace;font-size:11px;
  color:var(--bark);letter-spacing:1.6px;padding-bottom:6px;border-bottom:1px solid rgba(122,74,36,.28);
}
.card h4{font-family:var(--serif);font-size:17.5px;letter-spacing:1px;margin:10px 0 7px;color:#332417}
.card p{font-size:13.4px;color:#5E5140;line-height:1.92}
.card:hover{transform:translateY(-3px);border-color:#C9A472;box-shadow:0 16px 30px rgba(58,36,19,.13)}

/* 界面：一大幅 + 竖排目录 */
.spread{display:grid;grid-template-columns:1.1fr .9fr;gap:20px;align-items:start}
.spread figure{margin:0;background:var(--paper-2);border:1px solid var(--line);border-radius:3px}
.spread .big{padding:10px;box-shadow:0 10px 26px rgba(58,36,19,.08)}
.spread .big img{position:static;width:100%;height:auto;aspect-ratio:691/1024;object-fit:cover}
.big figcaption{font-size:12.5px;color:var(--muted);padding:10px 4px 2px;letter-spacing:.6px}
.strip{display:grid;gap:12px}
.strip figure{display:grid;grid-template-columns:88px 1fr;gap:14px;align-items:center;padding:10px;background:transparent;border:0;border-radius:0}
.strip figure+figure{border-top:1px dashed rgba(122,74,36,.24)}
.strip img{width:88px;height:118px;object-fit:cover;border:1px solid rgba(192,138,78,.5)}
.strip figcaption{font-size:13.2px;color:#5E5140;letter-spacing:.4px}

/* 指南：木牌步骤 */
.steps{list-style:none;max-width:900px}
.steps li{
  position:relative;background:var(--paper-2);border:1px solid var(--line);border-radius:3px;
  padding:14px 18px 14px 66px;margin-bottom:12px;font-size:14.2px;color:#4E4030;
  box-shadow:0 2px 0 rgba(122,74,36,.09);
}
.steps b{
  position:absolute;left:14px;top:13px;width:34px;height:34px;border-radius:2px;
  background:linear-gradient(180deg,#8B5A2E,#5E3A1C);color:#F9E9C9;
  display:grid;place-items:center;font-family:"SFMono-Regular",Consolas,monospace;
  font-size:12px;font-weight:800;transform:rotate(-3deg);
  box-shadow:inset 0 1px 0 rgba(255,225,180,.3);
}
.gnote{
  margin-top:16px;max-width:900px;border-left:3px solid var(--bark-l);
  background:rgba(192,138,78,.13);padding:12px 16px;font-size:13px;color:#6B5A44;
}

/* 答疑：双列木格 */
.qa{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.qa-item{
  background:var(--paper-2);border:1px solid var(--line);border-radius:3px;
  padding:18px 18px 16px;box-shadow:0 2px 0 rgba(122,74,36,.08);
}
.qa-item:nth-child(5){grid-column:1 / -1}
.qa-item .qn{
  display:block;font-family:"SFMono-Regular",Consolas,monospace;font-size:10.5px;
  letter-spacing:1.6px;color:var(--bark-l);margin-bottom:6px;
}
.qa-item h3{font-family:var(--serif);font-size:16.5px;letter-spacing:.8px;margin-bottom:7px;color:#332417}
.qa-item p{font-size:13.7px;color:#5E5140;line-height:1.9}

/* 评价：书签木夹 */
.rev-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.rev-card{
  position:relative;background:var(--paper-2);border:1px solid var(--line);border-radius:3px;
  border-left:4px solid var(--bark);padding:22px 20px 16px;
  box-shadow:0 8px 20px rgba(58,36,19,.08);
}
.rev-card::before{
  content:"\201C";position:absolute;top:0;right:12px;font-family:Georgia,serif;
  font-size:58px;line-height:1;color:rgba(192,138,78,.24);
}
.rev-card blockquote{position:relative;z-index:1;font-size:13.4px;color:#4E4030;line-height:1.96}
.rev-card .who{
  display:flex;align-items:center;gap:8px;margin-top:14px;padding-top:10px;
  border-top:1px dashed rgba(122,74,36,.26);font-size:10.8px;color:var(--muted);
}
.rev-card .who i{
  width:23px;height:23px;border-radius:2px;background:rgba(192,138,78,.26);color:#6B411E;
  font-style:normal;font-size:10.5px;font-weight:800;display:grid;place-items:center;
}
.rev-card .who time{font-family:"SFMono-Regular",Consolas,monospace;letter-spacing:0}

/* ============ 下载：暖光木屋 ============ */
.get{
  position:relative;overflow:hidden;padding:66px 0 68px;text-align:center;color:#F6E7CD;
  background:
    radial-gradient(560px 360px at 50% -6%,rgba(255,150,60,.34),transparent 72%),
    repeating-linear-gradient(0deg,rgba(255,214,160,.05) 0 1px,transparent 1px 118px),
    linear-gradient(180deg,#33200F,#1B0F07);
}
.get::before{
  content:"";position:absolute;left:50%;top:-70px;width:360px;height:360px;margin-left:-180px;
  border:1px dashed rgba(192,138,78,.26);border-radius:50%;
}
.get-in{position:relative;z-index:1}
.dlogo{display:flex;align-items:center;justify-content:center;gap:11px;margin-bottom:14px}
.dlogo img{width:46px;height:46px;border-radius:8px;border:1px solid rgba(192,138,78,.5)}
.dlogo em{font-style:normal;font-size:10px;letter-spacing:3px;color:rgba(226,183,127,.7)}
.get h2{font-family:var(--serif);font-size:34px;letter-spacing:3px;margin-bottom:11px;color:#FDF3DF}
.get h2 em{font-style:normal;color:#E9A45F}
.get p{
  font-size:13.9px;color:rgba(246,231,205,.74);max-width:650px;margin:0 auto 20px;line-height:1.96;
}
.dm{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:24px}
.dm span{
  font-size:11px;border:1px solid rgba(240,210,160,.3);border-radius:999px;
  padding:3px 12px;color:rgba(246,231,205,.82);
}
.get .btn{box-shadow:0 4px 0 var(--red-d),0 12px 26px rgba(0,0,0,.42)}

/* ============ 页脚 ============ */
.ft{
  background:#1B0F07;color:rgba(246,231,205,.62);padding:34px 0 26px;font-size:12.2px;
  border-top:3px solid var(--bark);
}
.ft-in{display:flex;flex-wrap:wrap;gap:10px 26px;align-items:flex-start;justify-content:space-between}
.ft-brand{display:flex;align-items:center;gap:9px;color:#F3DFBD;font-weight:700;font-size:13.5px;font-family:var(--serif);letter-spacing:1.6px}
.ft-brand img{width:26px;height:26px;border:1px solid rgba(192,138,78,.36);border-radius:6px}
.ft p{max-width:520px;line-height:1.92;color:rgba(246,231,205,.58)}
.ft-links{display:flex;gap:16px;flex-wrap:wrap;font-size:11.8px}
.ft-links a:hover{color:#E9A45F}
.ft-copy{width:100%;border-top:1px solid rgba(240,210,160,.16);padding-top:13px;font-size:11px;color:rgba(246,231,205,.42);line-height:1.9}

/* ============ 返回顶部 ============ */
.backtop{
  position:fixed;right:24px;bottom:88px;z-index:70;width:42px;height:42px;border-radius:50%;
  background:var(--paper-2);border:1px solid rgba(58,36,19,.24);color:var(--wood);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  box-shadow:0 6px 16px rgba(58,36,19,.16);
  opacity:0;visibility:hidden;transition:opacity .2s ease;
}
.backtop.on{opacity:1;visibility:visible}
.backtop:hover{background:var(--bark);color:#FFF7E6;border-color:var(--bark)}

/* ============ 响应式 960 ============ */
@media (max-width:960px){
  .nav{
    display:none;position:absolute;top:70px;left:0;right:0;margin-left:0;
    background:#241509;border-bottom:1px solid rgba(192,138,78,.3);
    flex-direction:column;gap:0;padding:6px 26px 12px;
  }
  .nav.open{display:flex}
  .nav a{padding:10px 0;border-bottom:1px solid rgba(192,138,78,.18)}
  .nav a::after{display:none}
  .nav-toggle{display:block;margin-left:auto}
  .cta{padding:9px 14px;font-size:11.5px}
  .hero{padding:48px 0 52px}
  .hero-grid{grid-template-columns:1fr;gap:38px}
  .hero h1{font-size:52px}
  .hero .desc{max-width:none}
  .shelf{max-width:470px;width:100%;height:430px;margin:0 auto}
  .feat-grid{grid-template-columns:1fr 1fr}
  .spread{grid-template-columns:1fr}
  .strip{grid-template-columns:repeat(3,1fr)}
  .strip figure{display:block;padding:9px}
  .strip img{width:100%;height:auto;aspect-ratio:3/4}
  .strip figcaption{display:block;padding-top:8px;font-size:12.4px}
  .qa{grid-template-columns:1fr}
  .qa-item:nth-child(5){grid-column:auto}
  .rev-grid{grid-template-columns:1fr 1fr}
  .rev-card:nth-child(3){grid-column:1 / -1}
}

/* ============ 响应式 600 ============ */
@media (max-width:600px){
  body{font-size:15px}
  .wrap{padding:0 18px}
  .top-in{height:62px;gap:10px}
  .brand img{width:32px;height:32px}
  .brand-t b{font-size:16px;letter-spacing:1.6px}
  .brand-t small{font-size:9px;letter-spacing:1px}
  .nav{top:62px;padding:4px 18px 10px}
  .cta{padding:8px 11px;font-size:10.8px}
  .hero{padding:34px 0 40px}
  .hero h1{font-size:41px;letter-spacing:5px}
  .hero .lead{font-size:16.5px}
  .hero .desc{font-size:13.8px}
  .hero::after{font-size:270px;bottom:-96px;left:-24px}
  .facts div{padding:0 12px}
  .facts b{font-size:11.5px}
  .facts span{font-size:10px}
  .shelf{height:330px;gap:12px;max-width:340px}
  .side{gap:14px}
  .tag{font-size:10px;padding:5px 10px;top:-14px;left:-6px}
  .sec{padding:42px 0}
  .hd2{grid-template-columns:1fr;gap:10px;margin-bottom:22px}
  .hd2 h2{font-size:24px;letter-spacing:1.2px}
  .hd2 p{font-size:13.4px}
  .feat-grid{grid-template-columns:1fr}
  .card{padding:18px 16px 18px 20px}
  .strip{grid-template-columns:1fr}
  .strip figure{grid-template-columns:78px 1fr;display:grid;padding:9px}
  .strip img{width:78px;height:104px}
  .steps li{padding:13px 14px 13px 58px;font-size:13.6px}
  .steps b{width:32px;height:32px;left:12px;top:12px;font-size:11px}
  .qa-item{padding:16px 15px 14px}
  .qa-item h3{font-size:15.5px}
  .rev-grid{grid-template-columns:1fr}
  .rev-card:nth-child(3){grid-column:auto}
  .get{padding:44px 0 48px}
  .get::before{width:280px;height:280px;margin-left:-140px}
  .get h2{font-size:25px;letter-spacing:2px}
  .dm span{font-size:10.4px;padding:2px 10px}
  .ft-in{flex-direction:column}
  .backtop{right:14px;bottom:74px;width:38px;height:38px}
}