@import url('https://fonts.googleapis.com/css2?family=Didact+Gothic&family=Poiret+One&display=swap');

:root{
  --pink:#eb879c;
  --soft:#ffb6c1;
  --ink:#26171a;
  --bg:#fff6f8;
  --card:#fffdfd;
  --muted:#6f545a;
  --line:rgba(38,23,26,.12);
  --r:28px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow:0 1px 2px rgba(38,23,26,.05),0 8px 20px -10px rgba(38,23,26,.2),0 22px 44px -28px rgba(235,135,156,.55);
  --lift:0 2px 4px rgba(38,23,26,.07),0 16px 30px -12px rgba(235,135,156,.62);
  --font:'Didact Gothic','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --deco:'Poiret One','Didact Gothic',system-ui,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:
    radial-gradient(900px 520px at 88% -10%,rgba(255,182,193,.52),transparent 60%),
    radial-gradient(720px 440px at -12% 28%,rgba(255,182,193,.3),transparent 62%),
    var(--bg);
  color:var(--ink);
  font-family:var(--font);
  font-size:17px;
  line-height:1.78;
}

a{color:inherit;transition:color .22s var(--ease),background-color .22s var(--ease),transform .22s var(--ease),box-shadow .22s var(--ease)}

:focus-visible{outline:3px solid var(--pink);outline-offset:3px;border-radius:10px}

img{max-width:100%}

::selection{background:var(--soft);color:var(--ink)}

/* 顶栏 */
.top{
  position:sticky;
  top:0;
  z-index:40;
  background:rgba(255,246,248,.9);
  backdrop-filter:blur(12px) saturate(140%);
  border-bottom:1px solid var(--line);
}

.topbar{
  max-width:1180px;
  margin:0 auto;
  padding:10px 20px 6px;
  display:flex;
  align-items:center;
  gap:12px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:4px 2px;
  font-family:var(--deco);
  font-size:1.42rem;
  letter-spacing:.16em;
  text-decoration:none;
  color:var(--ink);
}

.brand .dot{
  width:14px;
  height:14px;
  border-radius:50%;
  background:linear-gradient(140deg,var(--soft),var(--pink));
  box-shadow:0 0 0 6px rgba(235,135,156,.18);
}

.menu{margin-left:auto;position:relative}

.menu > summary{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:10px 18px;
  border-radius:999px;
  background:var(--card);
  box-shadow:var(--shadow);
  cursor:pointer;
  list-style:none;
  font-size:16px;
}

.menu > summary::-webkit-details-marker{display:none}

.menu > summary::before{
  content:"";
  width:18px;
  height:2px;
  border-radius:2px;
  background:var(--ink);
  box-shadow:0 6px 0 var(--ink),0 -6px 0 var(--ink);
  transition:transform .22s var(--ease);
}

.menu[open] > summary{color:var(--pink)}

.menu > menu{
  list-style:none;
  margin:10px 0 0;
  padding:10px;
  position:absolute;
  right:0;
  top:100%;
  width:min(74vw,300px);
  max-height:70vh;
  overflow:auto;
  background:var(--card);
  border-radius:22px;
  box-shadow:var(--lift);
  display:grid;
  gap:2px;
}

.menu > menu a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 14px;
  border-radius:14px;
  font-size:16px;
  text-decoration:none;
  border-bottom:2px solid transparent;
}

.menu > menu a:hover{background:var(--bg);border-bottom-color:var(--soft);transform:translateX(2px)}

.ticker{
  max-width:1180px;
  margin:0 auto;
  padding:0 20px 10px;
  font-size:14px;
  letter-spacing:.18em;
  color:var(--muted);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

@media (min-width:920px){
  .menu{display:flex;align-items:center}
  .menu > summary{display:none}
  .menu > menu{
    position:static;
    display:flex;
    flex-wrap:wrap;
    gap:2px;
    margin:0;
    padding:0;
    width:auto;
    max-height:none;
    overflow:visible;
    background:none;
    box-shadow:none;
    border-radius:0;
  }
  .menu > menu a{padding:8px 12px}
}

/* 首屏 */
.hero{
  position:relative;
  max-width:1180px;
  margin:0 auto;
  padding:26px 20px 58px;
  display:grid;
  gap:28px;
  min-height:45vh;
  align-items:center;
}

.hero::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:16px;
  background:linear-gradient(90deg,var(--pink),var(--soft));
  clip-path:polygon(0 45%,100% 0,100% 100%,0 100%);
}

.hero-copy h1{
  font-family:var(--deco);
  font-weight:400;
  font-size:clamp(2rem,7.4vw,3.5rem);
  line-height:1.16;
  letter-spacing:.05em;
  margin:.1em 0 .5em;
}

.lead{color:var(--muted);margin:0;max-width:36ch}

.hero-art{
  position:relative;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
  min-height:212px;
}

.hero-fig{
  margin:0;
  border-radius:var(--r);
  overflow:hidden;
  background:linear-gradient(155deg,var(--soft),#fff);
  box-shadow:var(--shadow);
}

.hero-fig img{display:block;width:100%;height:100%;object-fit:cover}

.fig1{clip-path:polygon(0 6%,100% 0,100% 100%,0 100%)}
.fig2{transform:translateY(22px);clip-path:polygon(0 0,100% 9%,100% 100%,0 93%)}

@media (min-width:880px){
  .hero{
    grid-template-columns:1.02fr .98fr;
    padding-top:44px;
    padding-bottom:72px;
  }
}

/* 主区 */
.wrap{
  max-width:1180px;
  margin:0 auto;
  padding:0 20px 40px;
  display:grid;
  gap:22px;
}

@media (min-width:920px){
  .wrap{grid-template-columns:264px minmax(0,1fr);gap:28px;align-items:start}
}

.toc{
  background-color:var(--card);
  background-image:linear-gradient(90deg,var(--pink),var(--soft));
  background-repeat:no-repeat;
  background-size:100% 5px;
  background-position:0 100%;
  border-radius:var(--r);
  box-shadow:var(--shadow);
  padding:22px 20px 26px;
}

@media (min-width:920px){
  .toc{position:sticky;top:124px}
}

.toc small{
  display:block;
  font-size:14px;
  letter-spacing:.22em;
  color:var(--pink);
  text-transform:uppercase;
}

.toc-title{
  font-family:var(--deco);
  font-weight:400;
  font-size:1.16rem;
  letter-spacing:.12em;
  margin:.12em 0 .9em;
}

.toc-list{list-style:none;margin:0;padding:0;counter-reset:t;display:grid;gap:2px}

.toc-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 10px;
  border-radius:14px;
  font-size:15px;
  text-decoration:none;
  border-bottom:2px solid transparent;
}

.toc-list a::before{
  counter-increment:t;
  content:counter(t,decimal-leading-zero);
  font-family:var(--deco);
  font-size:14px;
  letter-spacing:.06em;
  color:var(--pink);
}

.toc-list a:hover,
.toc-list a.on{background:var(--bg);border-bottom-color:var(--soft);transform:translateX(3px)}

.doc{min-width:0}

.paper{
  background-color:var(--card);
  background-image:linear-gradient(90deg,var(--pink),var(--soft));
  background-repeat:no-repeat;
  background-size:100% 6px;
  background-position:0 100%;
  border-radius:var(--r);
  box-shadow:var(--shadow);
  padding:30px 22px 34px;
  overflow-wrap:break-word;
}

@media (min-width:640px){
  .paper{padding:44px 40px 54px}
}

.paper div{scroll-margin-top:132px}

.paper div + div{
  margin-top:2.6rem;
  padding-top:2.2rem;
  border-top:1px solid var(--line);
}

.paper h2{
  font-size:1.32rem;
  line-height:1.42;
  letter-spacing:.04em;
  margin:1.8rem 0 .7rem;
  scroll-margin-top:132px;
}

.paper h3{
  font-size:1.1rem;
  line-height:1.5;
  margin:1.4rem 0 .5rem;
  scroll-margin-top:132px;
}

.paper small{
  display:block;
  font-size:14px;
  letter-spacing:.2em;
  color:var(--pink);
  margin:1.7rem 0 -.35rem;
}

.paper p{margin:0 0 1rem;max-width:70ch}
.paper ul,.paper ol{margin:0 0 1rem;padding-left:1.35em}
.paper li{margin:.3em 0}

.paper a{color:#b4526b;text-decoration-color:var(--soft);text-underline-offset:3px}
.paper a:hover{color:var(--pink)}

.paper img{border-radius:20px;height:auto;box-shadow:var(--shadow)}

.paper blockquote{
  margin:1.2rem 0;
  padding:.6rem 1.1rem;
  border-left:4px solid var(--soft);
  border-radius:0 16px 16px 0;
  background:var(--bg);
  color:var(--muted);
}

.paper table{border-collapse:collapse;width:100%;margin:0 0 1rem;font-size:16px}
.paper th,.paper td{border-bottom:1px solid var(--line);padding:.5rem .6rem;text-align:left}

@media (max-width:639px){
  .paper table{display:block;overflow-x:auto}
}

/* 页脚 */
footer{
  background:var(--ink);
  color:#f9e9ed;
  margin-top:40px;
  padding:46px 20px 18px;
}

.fgrid{max-width:1180px;margin:0 auto;display:grid;gap:28px}

@media (min-width:760px){
  .fgrid{grid-template-columns:1fr 1fr 1.1fr;gap:36px;align-items:start}
}

address{font-style:normal}

.f-brand{
  display:block;
  font-family:var(--deco);
  font-size:1.7rem;
  letter-spacing:.16em;
  color:#fff;
}

.f-links ul{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:2px;
}

.f-links a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:4px 0;
  font-size:15px;
  text-decoration:none;
  color:#f3d7de;
  border-bottom:2px solid transparent;
}

.f-links a:hover{color:#fff;border-bottom-color:var(--pink)}

.f-sub label{
  display:block;
  font-size:15px;
  letter-spacing:.16em;
  color:#f3d7de;
  margin-bottom:8px;
}

.f-row{display:flex;gap:8px;flex-wrap:wrap}

.f-row input{
  flex:1 1 160px;
  min-height:46px;
  padding:10px 14px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.24);
  background:rgba(255,255,255,.09);
  color:#fff;
  font:inherit;
  font-size:16px;
}

.f-row input::placeholder{color:#d9bfc5}

.f-row button{
  min-height:46px;
  padding:10px 24px;
  border:0;
  border-radius:14px;
  cursor:pointer;
  background:linear-gradient(120deg,var(--pink),var(--soft));
  color:var(--ink);
  font:inherit;
  font-weight:700;
  box-shadow:var(--lift);
}

.f-row button:hover{transform:translateY(-1px)}

.f-base{
  max-width:1180px;
  margin:34px auto 0;
  padding-top:14px;
  border-top:1px solid rgba(255,255,255,.16);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  text-align:center;
  font-size:14px;
  color:#d9bfc5;
}

.f-base p{margin:0}

.totop{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:6px 18px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.3);
  text-decoration:none;
  color:#ffe9ee;
}

.totop:hover{background:var(--pink);color:var(--ink);border-color:var(--pink)}

/* 动效 */
@media (prefers-reduced-motion:no-preference){
  @keyframes rise{
    from{opacity:0;transform:translateY(14px)}
    to{opacity:1;transform:none}
  }
  .hero-copy,.hero-art{animation:rise .46s var(--ease) both}
  .hero-art{animation-delay:.08s}
  .toc-list li{animation:rise .32s var(--ease) both;animation-delay:calc(var(--i,0) * 45ms)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none !important;transition:none !important}
}

button[aria-expanded]{min-width:44px;min-height:44px}