:root{
  --bg:#0a0f1d; --panel:#121a2e; --panel2:#0d1425;
  --ink:#e9e4d6; --ink2:#aab3c4; --ink3:#6f7a8f;
  --sea:#4da3ff; --sea2:#8fd0ff; --gold:#d9b46a;
  --line:rgba(255,255,255,.08);
}
html[data-theme="light"]{
  --bg:#f6f2e8; --panel:#fffdf7; --panel2:#efe9db;
  --ink:#22262e; --ink2:#5b6472; --ink3:#8e97a6;
  --sea:#1f6fc0; --sea2:#3d8fd8; --gold:#a97d28;
  --line:rgba(0,0,0,.09);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Songti SC","Noto Serif SC",Georgia,"Source Han Serif SC",serif;
  background:var(--bg); color:var(--ink);
  line-height:2.05; letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
::selection{background:var(--sea);color:#06121f}

/* ===== 顶部导航 ===== */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;gap:.6rem;
  padding:.55rem 1rem;
  background:rgba(10,15,29,.82);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  font-family:-apple-system,"PingFang SC",sans-serif;font-size:.82rem;
}
html[data-theme="light"] .topbar{background:rgba(255,253,247,.86)}
.topbar .brand{color:var(--sea2);letter-spacing:.14em;font-weight:600;flex-shrink:0}
.topbar .sep{color:var(--ink3);flex-shrink:0}
.topbar .cur{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--ink2);text-align:center}
.topbar button{
  background:none;border:1px solid var(--line);color:var(--ink2);
  padding:.28rem .6rem;border-radius:6px;cursor:pointer;font-size:.78rem;
  font-family:inherit;transition:.2s;flex-shrink:0;
}
.topbar button:hover{color:var(--sea2);border-color:var(--sea)}

#prog{position:fixed;top:0;left:0;height:2px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--sea),var(--sea2));transition:width .1s}

/* ===== 首页 hero ===== */
.hero{
  min-height:100vh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;
  padding:6rem 1.2rem 4rem;position:relative;overflow:hidden;
  background:
    radial-gradient(ellipse 80% 55% at 50% 8%,rgba(77,163,255,.18),transparent 70%),
    radial-gradient(ellipse 60% 45% at 50% 105%,rgba(143,208,255,.10),transparent 70%),
    var(--bg);
}
html[data-theme="light"] .hero{background:radial-gradient(ellipse 80% 55% at 50% 8%,rgba(31,111,192,.10),transparent 70%),var(--bg)}
.hero .rays{position:absolute;inset:0;pointer-events:none;opacity:.5;
  background:repeating-linear-gradient(180deg,transparent 0 46px,rgba(255,255,255,.014) 46px 47px)}
.hero .cover{
  width:min(210px,52vw);aspect-ratio:3/4;object-fit:cover;display:block;
  border-radius:5px;margin:0 auto 2.4rem;
  box-shadow:0 26px 62px rgba(0,0,0,.58),0 0 0 1px rgba(255,255,255,.10);
  animation:coverGlow 6.5s ease-in-out infinite;
}
@keyframes coverGlow{
  0%,100%{box-shadow:0 26px 62px rgba(0,0,0,.58),0 0 0 1px rgba(143,208,255,.16)}
  50%{box-shadow:0 30px 74px rgba(0,0,0,.66),0 0 44px rgba(77,163,255,.30)}
}
.hero .mark{font-size:.78rem;letter-spacing:.5em;color:var(--sea2);margin-bottom:2.2rem;
  font-family:-apple-system,"PingFang SC",sans-serif;text-transform:uppercase}
.hero h1{font-size:clamp(2.6rem,9vw,5.4rem);font-weight:600;letter-spacing:.16em;
  line-height:1.25;margin-bottom:.4rem;
  background:linear-gradient(180deg,#fff,#9fc9ff);-webkit-background-clip:text;background-clip:text;color:transparent}
html[data-theme="light"] .hero h1{background:linear-gradient(180deg,#1b2330,#2c6fb0);-webkit-background-clip:text;color:transparent}
.hero .sub{font-size:clamp(.95rem,2.6vw,1.15rem);color:var(--ink2);letter-spacing:.34em;margin-bottom:2.4rem}
.hero .author{font-size:1rem;color:var(--gold);letter-spacing:.3em;margin-bottom:3rem;
  font-family:-apple-system,"PingFang SC",sans-serif}
.hero .meta{display:flex;gap:2.6rem;margin-bottom:3rem;font-family:-apple-system,"PingFang SC",sans-serif;font-size:.8rem;color:var(--ink3);letter-spacing:.1em}
.hero .meta b{display:block;color:var(--ink);font-size:1.5rem;font-weight:600;margin-bottom:.15rem;font-family:inherit}
.hero .quote{max-width:30em;color:var(--ink2);font-size:.95rem;font-style:italic;
  border-left:2px solid var(--sea);padding-left:1.1rem;text-align:left;line-height:1.9}
.hero .scroll{position:absolute;bottom:1.6rem;color:var(--ink3);font-size:.7rem;letter-spacing:.4em;
  animation:float 2.4s ease-in-out infinite;font-family:-apple-system,"PingFang SC",sans-serif}
@keyframes float{0%,100%{transform:translateY(0);opacity:.5}50%{transform:translateY(7px);opacity:1}}

/* ===== 目录 ===== */
.toc{padding:5rem 1.2rem 6rem;max-width:860px;margin:0 auto}
.toc h2{font-size:1.5rem;letter-spacing:.4em;text-align:center;color:var(--ink);
  margin-bottom:.7rem;font-weight:600}
.toc .hint{text-align:center;color:var(--ink3);font-size:.8rem;letter-spacing:.16em;
  margin-bottom:3.4rem;font-family:-apple-system,"PingFang SC",sans-serif}
.list{display:flex;flex-direction:column;gap:.7rem}
.item{
  display:grid;grid-template-columns:3.2rem 1fr auto;align-items:center;gap:1.1rem;
  padding:1.05rem 1.2rem;border:1px solid var(--line);border-radius:10px;
  background:linear-gradient(180deg,var(--panel),var(--panel2));
  transition:.28s;position:relative;overflow:hidden;
}
.item::before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;
  background:linear-gradient(180deg,var(--sea),var(--sea2));transform:scaleY(0);transform-origin:top;transition:.3s}
.item:hover{transform:translateX(6px);border-color:var(--sea);box-shadow:0 8px 30px rgba(0,0,0,.28)}
.item:hover::before{transform:scaleY(1)}
.item .no{font-size:1.5rem;color:var(--sea2);font-weight:600;font-family:Georgia,serif;
  font-variant-numeric:tabular-nums}
.item .ti{display:flex;flex-direction:column;gap:.2rem}
.item .ti b{font-size:1.06rem;font-weight:600;letter-spacing:.06em}
.item .ti span{font-size:.74rem;color:var(--ink3);font-family:-apple-system,"PingFang SC",sans-serif;letter-spacing:.08em}
.item .ar{color:var(--sea2);font-size:1.1rem;opacity:0;transform:translateX(-6px);transition:.28s}
.item:hover .ar{opacity:1;transform:translateX(0)}

/* ===== 正文页 ===== */
.prose{padding:5.4rem 1.2rem 5rem;max-width:42em;margin:0 auto}
.phead{text-align:center;margin-bottom:3.2rem;padding-bottom:2rem;border-bottom:1px solid var(--line)}
.phead .no{font-size:.74rem;letter-spacing:.5em;color:var(--sea2);margin-bottom:1rem;
  font-family:-apple-system,"PingFang SC",sans-serif}
.phead h1{font-size:clamp(1.7rem,5vw,2.5rem);letter-spacing:.18em;font-weight:600;margin-bottom:.9rem}
.phead .stat{font-size:.76rem;color:var(--ink3);letter-spacing:.14em;font-family:-apple-system,"PingFang SC",sans-serif}
.prose p{margin-bottom:1.55em;text-indent:2em}
.prose p.top{color:var(--ink2)}
.prose p.kindle-cn-para-right{text-align:right;text-indent:0;color:var(--ink3);font-size:.9em}
.prose br+br,.prose p br{display:none}

/* 章末 */
.nav-bot{display:flex;justify-content:space-between;gap:.8rem;margin-top:4rem;
  padding-top:2rem;border-top:1px solid var(--line);flex-wrap:wrap}
.nav-bot a{flex:1;min-width:150px;padding:1rem 1.1rem;border:1px solid var(--line);border-radius:10px;
  background:linear-gradient(180deg,var(--panel),var(--panel2));transition:.25s;
  font-family:-apple-system,"PingFang SC",sans-serif;font-size:.84rem}
.nav-bot a:hover{border-color:var(--sea);transform:translateY(-3px)}
.nav-bot a .k{display:block;color:var(--ink3);font-size:.7rem;letter-spacing:.2em;margin-bottom:.35rem}
.nav-bot a .v{color:var(--ink);font-weight:600}
.nav-bot a.right{text-align:right}

/* footer */
footer{padding:2.6rem 1.2rem;text-align:center;color:var(--ink3);font-size:.74rem;
  letter-spacing:.12em;border-top:1px solid var(--line);font-family:-apple-system,"PingFang SC",sans-serif;
  line-height:1.9}
footer a{color:var(--sea2)}

@media(max-width:560px){
  .topbar{font-size:.74rem;padding:.5rem .7rem;gap:.4rem}
  .topbar .cur{display:none}
  .topbar .brand{letter-spacing:.08em}
  .item{grid-template-columns:2.6rem 1fr auto;padding:.9rem .95rem;gap:.8rem}
  .item .no{font-size:1.25rem}
  .item .ti b{font-size:.98rem}
  .hero .meta{gap:1.6rem}
}
@media print{
  .topbar,#prog,.nav-bot,footer{display:none!important}
  .prose{max-width:none;padding:0}
  body{background:#fff;color:#000}
}