/* =======================================================
   海棠书屋官方下载站 - haitangshuwuapp.cn
   配色：粉红→橙（年轻少女风），移动端优先
   参考：qaoutlpxt.com.cn 极简结构
   ======================================================= */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --c-pink:#ec4899;
  --c-pink-d:#db2777;
  --c-orange:#f97316;
  --c-orange-d:#ea580c;
  --c-rose:#f43f5e;
  --c-bg:#fff;
  --c-bg-alt:#fff7f8;
  --c-text:#1f2937;
  --c-text-m:#4b5563;
  --c-text-s:#6b7280;
  --c-border:#fce7f3;
  --c-border-2:#fed7aa;
  --c-shadow:0 4px 20px rgba(236,72,153,0.08);
  --c-shadow-2:0 12px 40px rgba(236,72,153,0.15);
  --grad:linear-gradient(135deg,#ec4899 0%,#f97316 100%);
  --grad-soft:linear-gradient(135deg,rgba(236,72,153,0.08),rgba(249,115,22,0.08));
  --grad-band:linear-gradient(135deg,#ec4899 0%,#f43f5e 50%,#f97316 100%);
  --radius-sm:8px;
  --radius:12px;
  --radius-lg:18px;
  --radius-xl:28px;
  --nav-h:64px;
  --float-h:72px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, "Segoe UI", Roboto, sans-serif;
}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 20px)}
body{
  font-family:var(--font);
  font-size:16px;line-height:1.7;color:var(--c-text);
  background:var(--c-bg);
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
  padding-top:env(safe-area-inset-top,0);
  min-width:320px;overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;-webkit-tap-highlight-color:transparent}
ul,ol{list-style:none}
button{border:0;background:none;cursor:pointer;font:inherit;color:inherit}
.skip-link{
  position:absolute;left:-9999px;top:0;width:1px;height:1px;overflow:hidden
}
.gradient-text{
  background:var(--grad);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;color:transparent;
}

/* ========== Navbar ========== */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:50;
  height:var(--nav-h);
  background:rgba(255,255,255,0.88);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid #fdf2f8;
  padding-top:env(safe-area-inset-top,0);
  box-shadow:0 1px 0 rgba(0,0,0,0.02);
}
.nav-inner{
  max-width:1180px;height:100%;margin:0 auto;padding:0 20px;
  display:flex;align-items:center;justify-content:space-between;gap:16px
}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800}
.brand-icon{
  width:38px;height:38px;flex:0 0 38px;border-radius:10px;
  background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:20px;box-shadow:0 4px 12px rgba(236,72,153,0.25);
}
.brand-text{font-size:19px;color:var(--c-text);letter-spacing:.5px}
.nav-list{display:flex;align-items:center;gap:28px}
.nav-list a{
  color:var(--c-text-m);font-size:15px;font-weight:500;
  padding:6px 2px;position:relative;transition:color .2s;
  min-height:48px;display:inline-flex;align-items:center
}
.nav-list a::after{
  content:"";position:absolute;left:50%;bottom:10px;
  width:0;height:2px;border-radius:2px;background:var(--grad);
  transform:translateX(-50%);transition:width .25s
}
.nav-list a:hover{color:var(--c-pink-d)}
.nav-list a:hover::after{width:100%}
.nav-cta{
  background:var(--grad);color:#fff;border-radius:10px;
  padding:10px 18px;font-weight:700;font-size:14px;
  min-height:40px;display:inline-flex;align-items:center;
  box-shadow:0 4px 14px rgba(236,72,153,0.3);
  transition:transform .15s, box-shadow .2s
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(236,72,153,0.38)}

/* ========== Layout ========== */
.wrap{max-width:1180px;margin:0 auto;padding:0 20px;min-width:0}
.sec-head{text-align:center;margin:0 auto 44px;max-width:820px}
.sec-tag{
  display:inline-block;padding:6px 18px;border-radius:999px;
  background:var(--grad-soft);color:var(--c-pink-d);
  font-size:13px;font-weight:700;letter-spacing:.5px;
  margin-bottom:16px;border:1px solid #fbcfe8
}
.sec-head h2{
  font-size:30px;line-height:1.35;font-weight:800;color:var(--c-text);
  margin-bottom:12px
}
.sec-head p{font-size:16px;color:var(--c-text-s)}

/* ========== Buttons ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 22px;border-radius:var(--radius);font-weight:700;font-size:15px;
  line-height:1.2;text-align:center;cursor:pointer;user-select:none;
  transition:all .2s ease-out;min-height:48px;
  -webkit-tap-highlight-color:transparent
}
.btn small{font-size:11px;font-weight:500;opacity:.85;display:block;margin-top:2px}
.btn-icon{font-size:18px}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 6px 18px rgba(236,72,153,0.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(236,72,153,0.42)}
.btn-primary:active{transform:translateY(0)}
.btn-outline{
  color:var(--c-pink-d);background:#fff;
  border:2px solid #fbcfe8;
}
.btn-outline:hover{background:#fff1f2;border-color:#f9a8d4}
.btn-xl{padding:16px 26px;font-size:16px;border-radius:var(--radius-lg);gap:12px}
.btn-xl small{font-size:12px}
.btn-sm{padding:10px 16px;font-size:14px;border-radius:10px;min-height:40px}

/* ========== Hero ========== */
.hero{
  padding:calc(var(--nav-h) + 56px) 0 64px;
  background:
    radial-gradient(1000px 600px at 10% -10%, rgba(236,72,153,0.14), transparent 60%),
    radial-gradient(800px 500px at 100% 10%, rgba(249,115,22,0.12), transparent 60%),
    linear-gradient(180deg,#fffafc 0%,#fff7f8 100%);
  overflow:hidden;
}
.hero-inner{
  max-width:1180px;margin:0 auto;padding:0 20px;
  display:grid;grid-template-columns:1.1fr 0.9fr;gap:60px;align-items:center
}
.hero-title{font-size:44px;line-height:1.15;font-weight:900;color:var(--c-text);letter-spacing:-0.5px}
.hero-title .gradient-text{font-size:52px;display:inline-block;margin-bottom:8px}
.hero-sub{font-size:22px;color:var(--c-text-m);font-weight:700;margin-top:12px;display:inline-block}
.hero-desc{margin:28px 0 32px;font-size:17px;color:var(--c-text-m);line-height:1.8}
.hero-desc strong{color:var(--c-pink-d);font-weight:700}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:36px}
.hero-cta .btn{min-width:230px}
.hero-stats{display:flex;gap:28px;flex-wrap:wrap}
.hero-stats li{display:flex;flex-direction:column}
.hero-stats strong{font-size:28px;font-weight:800;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;line-height:1.1}
.hero-stats span{font-size:13px;color:var(--c-text-s);margin-top:4px}

/* Hero Cover Card */
.hero-cover{display:flex;align-items:center;justify-content:center}
.cover-card{
  width:100%;max-width:440px;border-radius:var(--radius-xl);
  background:#fff;box-shadow:var(--c-shadow-2);
  border:1px solid #fce7f3;overflow:hidden;
  transform:perspective(1200px) rotateY(-6deg) rotateX(4deg);
  transition:transform .4s
}
.cover-card:hover{transform:perspective(1200px) rotateY(0) rotateX(0)}
.cover-header{
  background:var(--grad);color:#fff;padding:16px 20px;
  display:flex;align-items:center;gap:8px
}
.cover-header .dot{width:10px;height:10px;border-radius:50%;flex:0 0 10px}
.dot-r{background:#fff;opacity:.9}.dot-y{background:#fff;opacity:.65}.dot-g{background:#fff;opacity:.5}
.cover-title{margin-left:10px;font-size:14px;font-weight:600;letter-spacing:.5px;opacity:.95}
.cover-body{padding:18px 20px;display:flex;flex-direction:column;gap:14px}
.book-row{display:flex;align-items:center;gap:12px;padding:8px;border-radius:10px;transition:background .2s}
.book-row:hover{background:#fff7f8}
.book-thumb{
  width:42px;height:56px;flex:0 0 42px;border-radius:6px;
  box-shadow:0 2px 6px rgba(0,0,0,0.1);
}
.thumb-1{background:linear-gradient(160deg,#f43f5e,#fb7185)}.thumb-2{background:linear-gradient(160deg,#ec4899,#f472b6)}
.thumb-3{background:linear-gradient(160deg,#db2777,#f97316)}.thumb-4{background:linear-gradient(160deg,#f97316,#fbbf24)}
.thumb-5{background:linear-gradient(160deg,#f43f5e,#a855f7)}.thumb-6{background:linear-gradient(160deg,#ec4899,#22d3ee)}
.book-t{font-size:14px;font-weight:700;color:var(--c-text);line-height:1.3}
.book-s{font-size:12px;color:var(--c-text-s);margin-top:3px;line-height:1.3}

/* ========== Features ========== */
.features{padding:88px 0;background:#fff}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.f-card{
  background:#fff;border-radius:var(--radius-lg);padding:28px 26px;
  border:1px solid var(--c-border);box-shadow:var(--c-shadow);
  transition:all .3s;position:relative;overflow:hidden
}
.f-card::before{
  content:"";position:absolute;inset:-1px;border-radius:var(--radius-lg);
  background:var(--grad);opacity:0;transition:opacity .3s;z-index:-1;padding:1px;
}
.f-card:hover{transform:translateY(-6px);box-shadow:0 20px 40px rgba(236,72,153,0.18);border-color:transparent}
.f-card:hover::before{opacity:.15}
.f-icon{
  width:56px;height:56px;border-radius:14px;
  background:linear-gradient(135deg,#fce7f3,#ffedd5);
  display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:18px
}
.f-card h3{font-size:19px;font-weight:800;color:var(--c-text);margin-bottom:10px}
.f-card p{font-size:14.5px;color:var(--c-text-m);line-height:1.75}
.f-card strong{color:var(--c-pink-d)}

/* ========== Stats Band ========== */
.stats-band{padding:68px 0;background:var(--grad-band);color:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stats-grid strong{display:block;font-size:40px;font-weight:900;line-height:1.1;margin-bottom:8px;color:#fff}
.stats-grid span{font-size:15px;opacity:.92}

/* ========== Reviews ========== */
.reviews{padding:88px 0;background:#fff7f8}
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.r-card{
  background:#fff;border-radius:var(--radius-lg);padding:28px;
  border:1px solid var(--c-border);box-shadow:var(--c-shadow);
  transition:transform .25s
}
.r-card:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(236,72,153,0.14)}
.r-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.avatar{
  width:44px;height:44px;border-radius:50%;flex:0 0 44px;
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:16px
}
.a-pink{background:linear-gradient(135deg,#ec4899,#f43f5e)}
.a-orange{background:linear-gradient(135deg,#f97316,#fbbf24)}
.a-rose{background:linear-gradient(135deg,#f43f5e,#8b5cf6)}
.r-head h4{font-size:15px;font-weight:700;color:var(--c-text);line-height:1.3}
.r-head small{font-size:12px;color:var(--c-text-s);margin-top:3px;display:block}
.stars{color:#f59e0b;font-size:16px;letter-spacing:2px;margin-bottom:12px}
.r-card > p{font-size:14.5px;color:var(--c-text-m);line-height:1.8}
.r-card strong{color:var(--c-pink-d);font-weight:700}

/* ========== FAQ ========== */
.faq{padding:88px 0;background:#fff}
.faq-wrap{max-width:860px}
.faq-list{display:flex;flex-direction:column;gap:14px}
.faq-item{
  background:#fff;border:1px solid var(--c-border);border-radius:var(--radius);
  overflow:hidden;transition:border-color .2s, box-shadow .2s
}
.faq-item[open]{border-color:#f9a8d4;box-shadow:0 6px 20px rgba(236,72,153,0.1)}
.faq-item > summary{
  list-style:none;cursor:pointer;padding:20px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  font-size:16px;font-weight:700;color:var(--c-text);
  min-height:56px;-webkit-tap-highlight-color:transparent
}
.faq-item > summary::-webkit-details-marker{display:none}
.faq-item > summary::after{
  content:"+";flex:0 0 28px;height:28px;border-radius:50%;
  background:var(--grad-soft);color:var(--c-pink-d);
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:800;transition:transform .25s,background .2s,color .2s
}
.faq-item[open] > summary::after{content:"−";background:var(--grad);color:#fff;transform:rotate(180deg)}
.faq-body{padding:4px 24px 22px}
.faq-body p{font-size:15px;color:var(--c-text-m);line-height:1.85;margin:0 0 8px}
.faq-body strong{color:var(--c-pink-d);font-weight:700}
.faq-body code{
  background:#fff1f2;color:var(--c-pink-d);padding:2px 8px;
  border-radius:6px;font-size:13px;font-family:"SF Mono",Consolas,monospace
}

/* ========== CTA Band ========== */
.cta-band{padding:68px 0;background:var(--grad-soft);border-top:1px solid #fce7f3;border-bottom:1px solid #fed7aa}
.cta-inner{display:grid;grid-template-columns:1.2fr 1fr;gap:32px;align-items:center}
.cta-text h2{font-size:30px;font-weight:800;line-height:1.35;color:var(--c-text);margin-bottom:10px}
.cta-text p{font-size:16px;color:var(--c-text-m)}
.cta-btns{display:flex;gap:14px;flex-wrap:wrap;justify-content:flex-end}
.cta-btns .btn{min-width:220px}

/* ========== Related Search ========== */
.related{padding:88px 0;background:#fff}
.related-list{display:flex;flex-wrap:wrap;gap:10px 12px;justify-content:center}
.related-list a{
  padding:9px 18px;border-radius:999px;
  background:#fff;border:1px solid var(--c-border);
  color:var(--c-pink-d);font-size:14px;font-weight:500;
  transition:all .2s
}
.related-list a:hover{background:var(--grad);color:#fff;border-color:transparent;transform:translateY(-1px)}

/* ========== Footer ========== */
.footer{background:#1a0a10;color:#f5d6e0}
.footer a{color:#f9a8d4}
.footer a:hover{color:#fff}
.footer-inner{
  max-width:1180px;margin:0 auto;padding:64px 20px 40px;
  display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:40px
}
.foot-col .brand{color:#fff;margin-bottom:14px}
.foot-col .brand .brand-text{color:#fff}
.foot-desc{font-size:14px;line-height:1.8;color:#d4a4b5}
.foot-col h4{font-size:15px;font-weight:700;color:#fff;margin-bottom:16px;letter-spacing:.5px}
.foot-col ul{display:flex;flex-direction:column;gap:10px}
.foot-col li a{font-size:14px;color:#d4a4b5}
.foot-col li a:hover{color:#fff}
.kw-list{flex-direction:row !important;flex-wrap:wrap;gap:8px !important}
.kw-list a{
  padding:5px 12px;border-radius:8px;background:rgba(255,255,255,0.06);
  border:1px solid rgba(252,231,243,0.15);font-size:12.5px !important;
  color:#f9a8d4 !important
}
.kw-list a:hover{background:rgba(236,72,153,0.28);color:#fff !important}
.foot-bottom{border-top:1px solid rgba(252,231,243,0.12)}
.foot-bottom .wrap{padding:22px 20px;color:#c08da2;font-size:13px;text-align:center;line-height:1.8}
.foot-bottom em{color:#f9a8d4;font-style:normal}

/* ========== Float Download (mobile) ========== */
.float-download{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:49;
  background:rgba(255,255,255,0.96);backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-top:1px solid #fce7f3;padding:12px 18px;
  padding-bottom:calc(12px + env(safe-area-inset-bottom));
  box-shadow:0 -4px 24px rgba(0,0,0,0.06);
  align-items:center;justify-content:space-between;gap:14px
}
.float-info{display:flex;align-items:center;gap:12px;min-width:0;flex:1}
.float-icon{
  width:44px;height:44px;border-radius:12px;flex:0 0 44px;
  background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:22px
}
.float-info strong{display:block;font-size:15px;color:var(--c-text);font-weight:800;line-height:1.2}
.float-info small{display:block;font-size:12px;color:var(--c-text-s);margin-top:3px}
.float-btn{min-width:120px;min-height:44px}

/* ========== Back to top ========== */
.back-top{
  position:fixed;right:20px;bottom:110px;z-index:48;
  width:48px;height:48px;min-height:48px;border-radius:50%;
  background:var(--grad);color:#fff;font-weight:800;
  display:none;align-items:center;justify-content:center;
  box-shadow:0 8px 22px rgba(236,72,153,0.35);
  font-size:20px;cursor:pointer;user-select:none;
  -webkit-tap-highlight-color:transparent
}
.back-top:hover{transform:translateY(-2px)}

/* =========================================================
   响应式断点 - 移动优先
   手机 < 640px （默认样式）
   平板/窄屏 PC: 640-1023px
   宽屏 PC: ≥1024px
   ========================================================= */

/* 平板 & 大屏手机 */
@media (max-width: 1023px) {
  .hero-inner{grid-template-columns:1fr;gap:40px;text-align:center}
  .hero-title{font-size:36px}
  .hero-title .gradient-text{font-size:40px}
  .hero-sub{font-size:18px}
  .hero-cta{justify-content:center}
  .hero-stats{justify-content:center}
  .hero-cover{order:2}
  .cover-card{transform:none}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:32px 20px}
  .stats-grid strong{font-size:32px}
  .cta-inner{grid-template-columns:1fr;text-align:center}
  .cta-btns{justify-content:center}
  .footer-inner{grid-template-columns:1fr 1fr;gap:36px}
}

/* 手机 - 主断点 */
@media (max-width: 640px) {
  body{font-size:15px;-webkit-text-size-adjust:100%;text-size-adjust:100%}
  .nav-list{display:none !important}
  .nav-cta{padding:10px 16px;font-size:13px;min-height:44px}
  .brand-text{font-size:17px}
  .nav-inner{padding:0 16px;gap:12px}
  .hero{padding:calc(var(--nav-h) + 36px) 0 48px}
  .hero-inner{padding:0 16px;gap:32px}
  .hero-title{font-size:28px;line-height:1.25}
  .hero-title .gradient-text{font-size:32px}
  .hero-sub{font-size:15px;margin-top:8px}
  .hero-desc{margin:20px 0 24px;font-size:15px;text-align:left}
  .hero-cta{flex-direction:column;gap:12px;margin-bottom:28px}
  .hero-cta .btn{width:100%;min-width:0}
  .hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
  .hero-stats strong{font-size:22px}
  .hero-stats span{font-size:12px;text-align:center}
  .hero-stats li{align-items:center}
  .wrap{padding:0 16px}
  .sec-head{margin-bottom:32px}
  .sec-head h2{font-size:23px}
  .sec-head p{font-size:14.5px}
  .features{padding:56px 0}
  .features-grid{grid-template-columns:1fr;gap:16px}
  .f-card{padding:22px 20px}
  .f-icon{width:48px;height:48px;font-size:22px;margin-bottom:14px}
  .f-card h3{font-size:17px}
  .f-card p{font-size:14px}
  .stats-band{padding:44px 0}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:24px 12px}
  .stats-grid strong{font-size:26px}
  .stats-grid span{font-size:13px}
  .reviews{padding:56px 0}
  .reviews-grid{grid-template-columns:1fr;gap:16px}
  .r-card{padding:22px}
  .faq{padding:56px 0}
  .faq-item > summary{padding:16px 18px;font-size:15px;min-height:52px;line-height:1.4}
  .faq-body{padding:2px 18px 18px}
  .faq-body p{font-size:14px;line-height:1.7}
  .faq-body code{font-size:12px;padding:2px 6px}
  .cta-band{padding:44px 0}
  .cta-inner{gap:22px}
  .cta-text h2{font-size:22px}
  .cta-text p{font-size:14.5px}
  .cta-btns{flex-direction:column;gap:12px}
  .cta-btns .btn{width:100%;min-width:0}
  .related{padding:56px 0}
  .related-list{gap:8px 10px}
  .related-list a{padding:9px 14px;font-size:13px;min-height:36px;display:inline-flex;align-items:center}
  .footer-inner{grid-template-columns:1fr;gap:28px;padding:44px 16px 28px}
  .foot-bottom .wrap{padding:18px 16px;font-size:12px;line-height:1.7}
  .float-download{display:flex}
  .back-top{right:14px;bottom:calc(var(--float-h) + env(safe-area-inset-bottom) + 14px);width:44px;height:44px;min-height:44px;font-size:18px}
  body{padding-bottom:calc(var(--float-h) + env(safe-area-inset-bottom))}
  .btn-xl{padding:14px 22px;font-size:15px}
  .btn{min-height:48px}
  .btn-sm{min-height:44px}
  .hero-cover{margin:0 -8px}
  .cover-card{transform:none}
  .sec-tag{font-size:12px;padding:5px 14px}
}

/* 超小手机 < 380px */
@media (max-width: 379px) {
  .hero-title{font-size:25px}
  .hero-title .gradient-text{font-size:28px}
  .stats-grid strong{font-size:22px}
  .nav-cta{padding:8px 12px;font-size:12.5px;min-height:40px}
  .brand-text{font-size:16px}
  .float-btn{min-width:108px;padding:9px 12px;font-size:13px;min-height:44px}
  .related-list a{padding:8px 12px;font-size:12.5px}
  .hero-stats{grid-template-columns:repeat(3,1fr);gap:10px}
  .hero-stats strong{font-size:20px}
  .hero-stats span{font-size:11px}
}

/* 宽屏 PC 细节强化 */
@media (min-width: 1280px) {
  .hero-title{font-size:50px}
  .hero-title .gradient-text{font-size:60px}
}