@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,400;0,500;0,700;1,400&family=Nunito:ital,wght@0,700;0,800;0,900;1,700&display=swap');

:root{
  --red:#ff0000;
  --violet:#8b00ff;
  --ink:#261717;
  --ink-soft:rgba(38,23,23,.74);
  --ink-line:rgba(38,23,23,.14);
  --glass:rgba(255,255,255,.24);
  --glass-mid:rgba(255,255,255,.42);
  --glass-hard:rgba(255,255,255,.62);
  --edge:rgba(255,255,255,.62);
  --blur:blur(16px);
  --r:10px;
  --shadow:0 22px 44px -22px rgba(38,23,23,.42);
  --rail:214px;
  --font-body:'DM Sans',system-ui,-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-head:'Nunito','DM Sans',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
}

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

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

body{
  margin:0;
  padding-left:var(--rail);
  min-height:100vh;
  overflow-x:hidden;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.7;
  color:var(--ink);
  background-color:#f8eff2;
  background-image:
    radial-gradient(46rem 40rem at 10% 6%, rgba(255,0,0,.30), transparent 62%),
    radial-gradient(38rem 36rem at 92% 20%, rgba(139,0,255,.30), transparent 64%),
    radial-gradient(52rem 44rem at 54% 104%, rgba(255,110,170,.34), transparent 68%),
    radial-gradient(30rem 26rem at 74% 62%, rgba(139,0,255,.18), transparent 70%);
  background-attachment:fixed;
  background-repeat:no-repeat;
}

h1,h2,h3,h4,p,figure,blockquote{margin:0}
menu{margin:0;padding:0;list-style:none}
img{max-width:100%;height:auto}
small{font-size:1rem}
a{color:inherit}
a:focus-visible,summary:focus-visible{outline:2px solid var(--violet);outline-offset:3px}

/* 左侧固定竖排导航 */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail);
  z-index:60;
  display:flex;
  flex-direction:column;
  gap:16px;
  padding:22px 16px 26px;
  border-right:1px solid var(--edge);
  box-shadow:24px 0 60px -46px rgba(38,23,23,.75);
}
.rail::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:rgba(255,255,255,.34);
  -webkit-backdrop-filter:var(--blur) saturate(1.15);
  backdrop-filter:var(--blur) saturate(1.15);
  box-shadow:inset -1px 0 0 rgba(255,255,255,.55);
}

.brand{
  display:flex;
  flex-direction:column;
  gap:8px;
  min-height:44px;
  padding:6px 4px;
  text-decoration:none;
  color:var(--ink);
  font-family:var(--font-head);
  font-weight:900;
  font-size:1.06rem;
  line-height:1.35;
  letter-spacing:.01em;
}
.brand-name{display:block}
.mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:auto;
  font-size:1.6rem;
  line-height:1;
}

.drawer{margin-top:6px}
.drawer>summary{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:10px 14px;
  border-radius:999px;
  border:1px solid var(--edge);
  background:var(--glass-hard);
  -webkit-backdrop-filter:var(--blur);
  backdrop-filter:var(--blur);
  box-shadow:var(--shadow);
  cursor:pointer;
  font-weight:700;
  font-size:1rem;
  list-style:none;
  user-select:none;
}
.drawer>summary::-webkit-details-marker{display:none}
.drawer>summary::marker{content:""}
.bars{
  display:inline-block;
  width:18px;
  height:2px;
  border-radius:2px;
  background:var(--ink);
  box-shadow:0 -6px 0 var(--ink),0 6px 0 var(--ink);
}
.drawer[open]>summary{
  position:fixed;
  top:22px;
  left:16px;
  z-index:62;
  background:rgba(255,255,255,.9);
}

.drawer-menu{
  position:fixed;
  inset:0;
  z-index:61;
  overflow-y:auto;
  display:grid;
  align-content:start;
  justify-items:center;
  gap:8px;
  padding:clamp(76px,13vh,140px) 22px 32px;
  background:rgba(248,239,242,.62);
  -webkit-backdrop-filter:blur(22px) saturate(1.2);
  backdrop-filter:blur(22px) saturate(1.2);
}
.drawer-menu li{width:min(520px,100%)}
.drawer-menu a{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:54px;
  padding:12px 18px;
  border-radius:var(--r);
  border:1px solid var(--edge);
  background:var(--glass-mid);
  text-decoration:none;
  font-family:var(--font-head);
  font-weight:800;
  font-size:1.06rem;
  transition:background .18s ease,transform .18s ease;
}
.drawer-menu a:hover{background:var(--glass-hard);transform:translateY(-1px)}

/* 右侧主按钮 */
.cta{
  position:fixed;
  top:18px;
  right:18px;
  z-index:70;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 22px;
  border-radius:999px;
  text-decoration:none;
  font-family:var(--font-head);
  font-weight:800;
  font-size:1rem;
  color:#fff;
  background:linear-gradient(118deg,var(--red),var(--violet));
  box-shadow:0 16px 32px -14px rgba(139,0,255,.75),inset 0 1px 0 rgba(255,255,255,.55);
  transition:transform .18s ease;
}
.cta:hover{transform:translateY(-1px)}

main{
  max-width:1120px;
  margin:0 auto;
  padding:clamp(26px,5vw,64px) clamp(16px,4vw,48px) 36px;
}

/* 首屏 */
.hero{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  align-items:center;
  gap:clamp(20px,4vw,52px);
  min-height:70vh;
  padding-block:8px 24px;
}
.hero-copy{min-width:0}
.hero h1{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(1.95rem,4.6vw,3.35rem);
  line-height:1.12;
  letter-spacing:-.012em;
  text-wrap:balance;
  margin-bottom:16px;
}
.lede{
  max-width:34ch;
  color:var(--ink-soft);
  font-size:clamp(1rem,1.35vw,1.1rem);
}
.hero-fig{
  position:relative;
  aspect-ratio:4/3;
  overflow:hidden;
  border-radius:calc(var(--r) + 8px);
  border:1px solid var(--edge);
  background:var(--glass-mid);
  box-shadow:var(--shadow),inset 0 1px 0 rgba(255,255,255,.7);
}
.hero-fig img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  transform:scale(1.06);
  will-change:transform;
}

/* 侧栏 + 正文 */
.stage{
  display:grid;
  grid-template-columns:198px minmax(0,1fr);
  align-items:start;
  gap:clamp(16px,3vw,30px);
  margin-top:clamp(14px,3vw,34px);
}
.rail-side{
  position:sticky;
  top:24px;
  padding:14px 12px 18px;
  border-radius:var(--r);
  border:1px solid var(--edge);
  background:var(--glass);
  -webkit-backdrop-filter:var(--blur);
  backdrop-filter:var(--blur);
  box-shadow:var(--shadow),inset 0 1px 0 rgba(255,255,255,.65);
}
.rail-side h2{
  margin:2px 0 10px;
  padding-left:4px;
  font-family:var(--font-head);
  font-size:.86rem;
  font-weight:800;
  letter-spacing:.16em;
  color:var(--ink-soft);
}
.side-list{display:grid;gap:4px}
.side-list a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:6px 10px;
  border-radius:8px;
  text-decoration:none;
  font-size:.98rem;
  font-weight:600;
  transition:background .18s ease;
}
.side-list a:hover{background:rgba(255,255,255,.72)}

.content{
  min-width:0;
  padding:clamp(18px,3.2vw,40px);
  border-radius:var(--r);
  border:1px solid var(--edge);
  background:rgba(255,255,255,.46);
  -webkit-backdrop-filter:blur(18px) saturate(1.2);
  backdrop-filter:blur(18px) saturate(1.2);
  box-shadow:var(--shadow),inset 0 1px 0 rgba(255,255,255,.8);
}
.content-title{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(1.3rem,2.4vw,1.85rem);
  line-height:1.24;
  margin-bottom:18px;
}
.content-title>span{
  background:linear-gradient(100deg,var(--red),var(--violet));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.page-h1{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(1.8rem,3.6vw,2.7rem);
  line-height:1.16;
  margin-bottom:16px;
}

.content article[id]{scroll-margin-top:94px}
.content article{
  animation:rise .62s cubic-bezier(.2,.72,.22,1) both;
}
.content article:nth-of-type(1){animation-delay:.04s}
.content article:nth-of-type(2){animation-delay:.09s}
.content article:nth-of-type(3){animation-delay:.14s}
.content article:nth-of-type(4){animation-delay:.19s}
.content article:nth-of-type(5){animation-delay:.24s}
.content article:nth-of-type(6){animation-delay:.29s}
.content article:nth-of-type(7){animation-delay:.34s}
.content article + article{
  margin-top:clamp(26px,4vw,46px);
  padding-top:clamp(20px,3vw,34px);
  border-top:1px dashed var(--ink-line);
}

.content article h2{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(1.24rem,2.2vw,1.68rem);
  line-height:1.3;
  margin-bottom:.62em;
}
.content article h3{
  font-family:var(--font-head);
  font-weight:800;
  font-size:1.12rem;
  line-height:1.4;
  margin:1.5em 0 .5em;
}
.content p{margin-bottom:1em}
.content p:last-child{margin-bottom:0}
.content ul,.content ol{margin:0 0 1.1em;padding-left:1.25em}
.content li{margin:.35em 0}
.content li::marker{color:var(--violet)}
.content strong{font-weight:800}
.content a{color:#7500db;text-underline-offset:3px}
.content a:hover{color:var(--red)}
.content blockquote{
  margin:0 0 1.1em;
  padding:12px 16px;
  border-left:3px solid var(--violet);
  border-radius:0 var(--r) var(--r) 0;
  background:rgba(255,255,255,.55);
}
.content figure{margin:0 0 1.1em}
.content figure img{border-radius:var(--r);display:block}
.content img{border-radius:var(--r)}
.content table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 1.1em;
  font-size:1rem;
}
.content th,.content td{
  padding:8px 10px;
  border:1px solid var(--ink-line);
  text-align:left;
  vertical-align:top;
}
.content th{background:rgba(255,255,255,.6);font-weight:800}
.content hr{border:0;border-top:1px dashed var(--ink-line);margin:1.5em 0}

/* 页脚：仅 p 与 small */
.foot{
  max-width:1120px;
  margin:clamp(34px,6vw,68px) auto 0;
  padding:clamp(22px,4vw,42px) clamp(16px,4vw,48px) 34px;
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  grid-template-areas:
    "brand top"
    "copy top";
  align-items:end;
  gap:8px 20px;
  border-top:1px solid var(--ink-line);
}
.foot-brand{
  grid-area:brand;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(2.1rem,8.6vw,4.6rem);
  line-height:.96;
  letter-spacing:-.02em;
  background:linear-gradient(108deg,var(--red),var(--violet));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  word-break:break-word;
}
.foot-copy{grid-area:copy;color:var(--ink-soft)}
.foot-top{grid-area:top;justify-self:end}
.foot-top a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 18px;
  border-radius:999px;
  border:1px solid var(--ink-line);
  background:rgba(255,255,255,.5);
  text-decoration:none;
  font-weight:700;
  font-size:1rem;
}
.foot-top a:hover{background:rgba(255,255,255,.82)}

@keyframes rise{
  from{opacity:0;transform:translateY(16px)}
  to{opacity:1;transform:translateY(0)}
}

@media (max-width:1000px){
  :root{--rail:186px}
  .stage{grid-template-columns:172px minmax(0,1fr)}
}

@media (max-width:880px){
  body{padding-left:0;padding-top:70px}
  .rail{
    inset:0 0 auto 0;
    width:auto;
    height:70px;
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:0 14px;
    border-right:0;
    border-bottom:1px solid var(--edge);
    box-shadow:0 14px 34px -28px rgba(38,23,23,.8);
  }
  .rail::before{box-shadow:none}
  .brand{
    flex-direction:row;
    align-items:center;
    gap:8px;
    min-height:44px;
    padding:4px 0;
    font-size:1rem;
  }
  .mark{font-size:1.35rem}
  .drawer{margin:0 0 0 auto}
  .drawer>summary{min-height:44px;padding:9px 14px;font-size:.95rem}
  .drawer[open]>summary{top:13px;left:auto;right:14px}
  .drawer-menu{padding:86px 16px 30px}
  .cta{top:auto;bottom:16px;right:14px;font-size:.95rem;padding:10px 18px}
  main{padding:18px 14px 24px}
  .hero{
    grid-template-columns:1fr;
    min-height:0;
    gap:18px;
    padding-block:4px 18px;
  }
  .hero h1{font-size:clamp(1.72rem,7.6vw,2.35rem)}
  .lede{max-width:none}
  .hero-fig{aspect-ratio:16/10;border-radius:var(--r)}
  .stage{grid-template-columns:1fr;gap:14px;margin-top:14px}
  .rail-side{position:static;padding:12px}
  .side-list{display:flex;flex-wrap:wrap;gap:6px}
  .side-list a{
    min-height:40px;
    padding:6px 12px;
    border-radius:999px;
    border:1px solid var(--edge);
    background:rgba(255,255,255,.55);
    font-size:.95rem;
  }
  .foot{
    grid-template-columns:1fr;
    grid-template-areas:
      "brand"
      "top"
      "copy";
    align-items:start;
    gap:12px;
    padding:22px 14px 92px;
  }
  .foot-top{justify-self:start}
}

@media (max-width:420px){
  .content{padding:16px}
  .drawer-txt{display:inline}
}

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

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