@import url('https://fonts.googleapis.com/css2?family=Libre+Bodoni:wght@400;500;600;700&family=Public+Sans:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#141414;
  --red:#D94F3D;
  --cream:#F5F0E6;
  --line:rgba(245,240,230,.16);
  --serif:'Libre Bodoni',Georgia,'Songti SC','Times New Roman',serif;
  --sans:'Public Sans','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
}

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

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

body{
  margin:0;
  background:var(--ink);
  color:var(--cream);
  font-family:var(--sans);
  font-size:1.0625rem;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
  padding-bottom:calc(80px + env(safe-area-inset-bottom));
}

a{color:inherit}
a:focus-visible{outline:2px solid var(--red);outline-offset:3px}

/* 角落品牌图标 */
.mark{
  position:fixed;
  top:1rem;
  left:1rem;
  z-index:60;
  width:44px;
  height:44px;
  display:grid;
  place-items:center;
  border-radius:50%;
  background:var(--red);
  color:var(--ink);
  font-family:var(--serif);
  font-size:1.35rem;
  font-weight:700;
  line-height:1;
  text-decoration:none;
}

/* 首屏 */
.hero{
  min-height:100vh;
  min-height:100svh;
  display:grid;
  place-items:center;
  text-align:center;
  padding:6rem 1.25rem 5rem;
  overflow:hidden;
}

.hero-in{will-change:transform}

.badge{
  width:56px;
  height:56px;
  margin:0 auto 1.75rem;
  display:grid;
  place-items:center;
  border:1px solid rgba(217,79,61,.7);
  border-radius:50%;
  color:var(--red);
  font-family:var(--serif);
  font-size:1.5rem;
  line-height:1;
}

h1{
  margin:0;
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(2.5rem,8.5vw,7rem);
  line-height:.98;
  letter-spacing:-.012em;
  word-break:break-word;
}

.ch{
  display:inline-block;
  animation:charIn .8s cubic-bezier(.2,.7,.3,1) both;
  animation-delay:calc(var(--i) * 55ms);
}

@keyframes charIn{
  from{opacity:0;transform:translateY(.55em) rotate(6deg);filter:blur(7px)}
  to{opacity:1;transform:none;filter:none}
}

.hero-in::after{
  content:'';
  display:block;
  width:88px;
  height:2px;
  margin:2.25rem auto 0;
  background:var(--red);
}

/* 主区：左目录 + 右正文 */
main{
  max-width:1180px;
  margin:0 auto;
  padding:3rem 1.25rem 5rem;
  display:grid;
  grid-template-columns:minmax(0,220px) minmax(0,1fr);
  gap:2.5rem 3rem;
  align-items:start;
}

aside{
  position:sticky;
  top:4.5rem;
}

aside small{
  display:block;
  color:var(--red);
  font-size:1rem;
  letter-spacing:.28em;
}

aside h3{
  margin:.15rem 0 1rem;
  font-family:var(--serif);
  font-weight:500;
  font-size:1.5rem;
  line-height:1.2;
}

aside ol{
  list-style:none;
  margin:0;
  padding:0;
  border-top:1px solid var(--line);
}

aside ol li{border-bottom:1px solid var(--line)}

aside ol a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:.2rem 0;
  font-size:1rem;
  text-decoration:none;
  color:rgba(245,240,230,.82);
}

aside ol a:hover{color:var(--red)}

/* 正文 */
article{
  min-width:0;
  max-width:70ch;
  overflow-wrap:break-word;
}

article > div{
  padding:3rem 0;
  border-top:1px solid var(--line);
  scroll-margin-top:2rem;
}

article > div:first-child{
  border-top:0;
  padding-top:.25rem;
}

article small{
  display:block;
  margin-bottom:.45rem;
  color:var(--red);
  font-size:1rem;
  letter-spacing:.24em;
}

article h2{
  margin:.1rem 0 1.2rem;
  font-family:var(--serif);
  font-weight:500;
  font-size:clamp(1.7rem,4vw,2.8rem);
  line-height:1.12;
  background:linear-gradient(120deg,#F5F0E6 0%,#F5F0E6 55%,#D94F3D 100%);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
}

article h3{
  margin:2rem 0 .6rem;
  font-family:var(--serif);
  font-weight:500;
  font-size:1.4rem;
  line-height:1.3;
}

article p{margin:0 0 1.15rem}

article ul,article ol{
  margin:0 0 1.2rem;
  padding-left:1.4rem;
}

article li{margin:.35rem 0}

article a{
  color:var(--red);
  text-decoration:underline;
  text-underline-offset:3px;
}

article strong{color:#fff;font-weight:600}

article img{
  max-width:100%;
  height:auto;
  border-radius:10px;
}

/* 页脚 */
footer{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:2rem;
  padding:3.5rem 1.25rem 1.5rem;
  background:#0d0d0d;
  border-top:1px solid var(--line);
}

footer > div{min-width:0}

footer small{
  display:block;
  margin-bottom:.35rem;
  color:var(--red);
  font-size:1rem;
  letter-spacing:.26em;
}

footer h3{
  margin:0 0 .8rem;
  font-family:var(--serif);
  font-weight:500;
  font-size:1.15rem;
  line-height:1.3;
}

footer ol{
  list-style:none;
  margin:0;
  padding:0;
}

footer li a{
  display:flex;
  align-items:center;
  min-height:44px;
  font-size:1rem;
  text-decoration:none;
  color:rgba(245,240,230,.8);
}

footer li a:hover{color:var(--red)}

.wordmark{
  margin:0 0 .8rem;
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(2.2rem,7vw,4rem);
  line-height:1;
  background:linear-gradient(100deg,#F5F0E6,#D94F3D);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
}

.f-desc{
  margin:0;
  max-width:34ch;
  font-size:1rem;
  line-height:1.7;
  color:rgba(245,240,230,.62);
}

.f-bar{
  grid-column:1/-1;
  margin-top:1rem;
  padding-top:1.2rem;
  border-top:1px solid var(--line);
  text-align:center;
}

.f-bar p{
  margin:0;
  font-size:1rem;
  color:rgba(245,240,230,.55);
}

/* 底部固定导航 */
.dock{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:70;
  display:flex;
  align-items:center;
  gap:.5rem;
  padding:.5rem .75rem;
  padding-bottom:calc(.5rem + env(safe-area-inset-bottom));
  background:rgba(20,20,20,.94);
  border-top:1px solid rgba(217,79,61,.4);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

.dock ol{
  display:flex;
  align-items:center;
  gap:.15rem;
  flex:1;
  min-width:0;
  margin:0;
  padding:0;
  list-style:none;
  overflow-x:auto;
  scrollbar-width:none;
}

.dock ol::-webkit-scrollbar{display:none}

.dock li{flex:0 0 auto}

.dock ol a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 .6rem;
  border-radius:10px;
  font-size:1rem;
  white-space:nowrap;
  text-decoration:none;
  color:var(--cream);
}

.dock ol a:hover{background:rgba(245,240,230,.1)}

.dock .cta{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 1.15rem;
  border-radius:10px;
  background:var(--red);
  color:var(--ink);
  font-weight:700;
  text-decoration:none;
}

/* 滚动显现 */
.reveal{opacity:0;transform:translateY(20px)}

.reveal.is-in{
  opacity:1;
  transform:none;
  transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1);
}

@media (max-width:860px){
  main{
    grid-template-columns:1fr;
    gap:1.5rem;
    padding:2rem 1.1rem 4rem;
  }

  aside{position:static}

  aside ol{
    display:flex;
    gap:.5rem;
    border-top:0;
    padding-bottom:.4rem;
    overflow-x:auto;
    scrollbar-width:none;
  }

  aside ol::-webkit-scrollbar{display:none}
  aside ol li{flex:0 0 auto;border:0}

  aside ol a{
    min-height:44px;
    padding:0 .85rem;
    border-radius:10px;
    background:rgba(245,240,230,.08);
    color:var(--cream);
  }

  aside h3{margin-bottom:.6rem}

  article > div{padding:2.5rem 0}

  footer{grid-template-columns:1fr 1fr;gap:1.5rem}
}

@media (max-width:520px){
  footer{grid-template-columns:1fr}
  .f-mark{grid-column:1/-1}
  .hero{padding:5rem 1.1rem 4rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .ch{animation:none}
  .reveal{opacity:1;transform:none}
}

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