@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:wght@400;600;700&family=EB+Garamond:wght@400;500;600;700;800&display=swap');

:root{
  --red:#ff0000;
  --violet:#8b00ff;
  --ink:#261717;
  --deep:#170d0d;
  --cream:#f7ece6;
  --dim:rgba(247,236,230,.74);
  --line:rgba(255,255,255,.16);
  --glass:rgba(255,255,255,.062);
  --serif:'EB Garamond','Crimson Text','Songti SC','Noto Serif SC',Georgia,serif;
}

*{box-sizing:border-box}

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

body{
  margin:0;
  font-family:var(--serif);
  font-size:17px;
  line-height:1.75;
  color:var(--cream);
  background:
    radial-gradient(58rem 34rem at 84% -10%,rgba(255,0,0,.30),transparent 62%),
    radial-gradient(50rem 32rem at 4% 10%,rgba(139,0,255,.26),transparent 60%),
    radial-gradient(42rem 30rem at 50% 110%,rgba(255,0,0,.14),transparent 66%),
    linear-gradient(180deg,#1e1111,#261717 44%,var(--deep));
  min-height:100vh;
}

::selection{background:rgba(255,0,0,.5);color:#fff}

a{color:inherit}
a:focus-visible,
summary:focus-visible{
  outline:2px solid var(--red);
  outline-offset:3px;
  border-radius:10px;
}

.skip{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:99;
  padding:10px 18px;
  background:var(--red);
  color:#fff;
  text-decoration:none;
  border-radius:0 0 12px 0;
}
.skip:focus{left:0}

/* 顶栏：品牌行在上，菜单行在下 */
.top{
  position:sticky;
  top:0;
  z-index:60;
  padding:6px 18px 0;
  background:rgba(30,18,18,.88);
  border-bottom:1px solid var(--line);
}

.top-brand{
  display:flex;
  align-items:center;
  min-height:56px;
  padding-bottom:6px;
  border-bottom:1px solid rgba(255,255,255,.09);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  min-height:44px;
  text-decoration:none;
  color:var(--cream);
}

.logo-img{display:block;width:36px;height:36px;border-radius:11px}
.logo-mark{
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  border-radius:11px;
  border:1px solid rgba(255,0,0,.5);
  background:rgba(255,0,0,.18);
  font-size:18px;
}
.logo-bit{
  width:11px;
  height:11px;
  border-radius:50%;
  background:var(--red);
  box-shadow:0 0 0 4px rgba(255,0,0,.22),0 0 16px rgba(255,0,0,.7);
}
.brand-name{
  font-size:20px;
  font-weight:600;
  letter-spacing:.07em;
}

.menu-wrap{position:relative;padding:7px 0 9px}

.menu-wrap>summary{
  position:relative;
  z-index:70;
  display:inline-flex;
  align-items:center;
  gap:11px;
  min-height:44px;
  padding:9px 18px;
  cursor:pointer;
  list-style:none;
  font-size:16px;
  letter-spacing:.18em;
  border:1px solid var(--line);
  border-radius:14px;
  background:rgba(255,255,255,.07);
}
.menu-wrap>summary::-webkit-details-marker{display:none}

.menu-bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  background:var(--red);
}
.menu-bars::before,
.menu-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:var(--cream);
  opacity:.8;
}
.menu-bars::before{top:-6px}
.menu-bars::after{top:6px}

.menu-panel{
  position:fixed;
  inset:0;
  z-index:65;
  margin:0;
  padding:130px 24px 44px;
  overflow-y:auto;
  background:rgba(20,12,12,.94);
  -webkit-backdrop-filter:blur(20px);
  backdrop-filter:blur(20px);
}
.menu-wrap:not([open]) .menu-panel{display:none}
.menu-wrap[open] .menu-panel{display:flex;flex-direction:column;gap:2px}

.menu-panel li{
  list-style:none;
  border-bottom:1px solid rgba(255,255,255,.09);
}
.menu-panel a{
  display:flex;
  align-items:center;
  min-height:54px;
  padding:12px 4px;
  font-size:22px;
  letter-spacing:.05em;
  text-decoration:none;
  color:var(--cream);
  transition:padding-left .22s ease,color .22s ease;
}
.menu-panel a:hover,
.menu-panel a:focus{color:#fff;padding-left:14px}

/* 版式骨架：main > article > section */
main{padding:24px 16px 0}

.sheet{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  grid-template-areas:
    "hero"
    "rail"
    "prose";
  gap:20px;
  max-width:1140px;
  margin:0 auto;
}

.rail{
  grid-area:rail;
  padding:16px 16px 18px;
  border:1px solid var(--line);
  border-radius:18px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
}
.rail-t{
  margin:0;
  font-size:17px;
  letter-spacing:.22em;
  font-weight:600;
}
.rule{
  height:1px;
  margin:10px 0 12px;
  border:0;
  background:linear-gradient(90deg,var(--red),rgba(139,0,255,.5),transparent);
}
.rail-list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.rail-list li{list-style:none}
.rail-list a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:6px 13px;
  border:1px solid rgba(255,255,255,.15);
  border-radius:12px;
  color:var(--dim);
  font-size:16px;
  text-decoration:none;
}
.rail-list a:hover{color:#fff;border-color:rgba(255,0,0,.55)}

/* 开篇 */
.hero{
  position:relative;
  grid-area:hero;
  overflow:hidden;
  display:flex;
  flex-direction:column;
  justify-content:center;
  min-height:45vh;
  padding:28px 22px 24px;
  border:1px solid var(--line);
  border-radius:22px;
  background:
    radial-gradient(26rem 14rem at 6% -20%,rgba(255,255,255,.16),transparent 70%),
    linear-gradient(150deg,rgba(255,255,255,.10),rgba(255,255,255,.028));
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
}

.hero-ghost{
  position:absolute;
  right:-8px;
  bottom:-14px;
  z-index:0;
  font-size:clamp(46px,11vw,124px);
  font-weight:700;
  line-height:.82;
  letter-spacing:.02em;
  white-space:nowrap;
  color:transparent;
  -webkit-text-stroke:1px rgba(255,0,0,.32);
  pointer-events:none;
}

.hero-copy{position:relative;z-index:2;max-width:44rem}

.hero h1{
  margin:0 0 12px;
  font-size:clamp(27px,5.1vw,46px);
  line-height:1.26;
  letter-spacing:.01em;
  font-weight:700;
}
.hero-lede{
  max-width:38rem;
  margin:0;
  color:var(--dim);
  font-size:17px;
}

.hero-media{
  position:relative;
  z-index:2;
  margin:20px 0 0;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:16px;
}
.hero-media img{display:block;width:100%;height:auto}

/* 正文 */
.prose{grid-area:prose;min-width:0}

.prose>section{
  margin:0 0 18px;
  padding:24px 20px;
  border:1px solid var(--line);
  border-radius:18px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(15px);
  backdrop-filter:blur(15px);
  scroll-margin-top:142px;
}

.js .prose>section{opacity:0;transform:translateY(16px)}
.js .prose>section.is-in{
  opacity:1;
  transform:none;
  transition:opacity .6s ease,transform .6s ease;
}

.prose h2{
  margin:0 0 4px;
  font-size:clamp(22px,3vw,28px);
  line-height:1.32;
  font-weight:700;
}
.prose h2+hr{
  width:66px;
  height:2px;
  margin:0 0 15px;
  border:0;
  background:linear-gradient(90deg,var(--red),rgba(139,0,255,.45));
}
.prose h3{
  margin:24px 0 8px;
  font-size:19px;
  line-height:1.4;
}
.prose p{margin:0 0 14px}
.prose ul,
.prose ol{margin:0 0 14px;padding-left:1.25em}
.prose li{margin:6px 0}
.prose a{color:#ff9b9b;text-decoration-color:rgba(255,0,0,.5)}
.prose a:hover{color:#fff}
.prose strong{color:#fff}
.prose code,
.prose kbd{font-size:15px}
.prose img{max-width:100%;height:auto;border:1px solid var(--line);border-radius:14px}
.prose hr{height:1px;margin:20px 0;border:0;background:var(--line)}
.prose blockquote{
  margin:0 0 14px;
  padding:10px 16px;
  border-left:3px solid var(--violet);
  border-radius:0 12px 12px 0;
  background:rgba(139,0,255,.11);
}
.prose table{width:100%;border-collapse:collapse;font-size:16px}
.prose th,
.prose td{padding:8px 10px;border:1px solid var(--line);text-align:left}

/* 页脚 */
.foot{
  max-width:1140px;
  margin:36px auto 0;
  padding:0 16px 34px;
}

.foot-cta{
  padding:28px 22px;
  border:1px solid rgba(255,255,255,.2);
  border-radius:22px;
  background:linear-gradient(140deg,rgba(255,0,0,.18),rgba(139,0,255,.16));
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  text-align:center;
}
.cta-h{
  margin:0;
  font-size:clamp(23px,4.4vw,36px);
  letter-spacing:.05em;
  font-weight:700;
}
.foot-cta .rule{max-width:120px;margin:11px auto 16px}
.cta-go{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:10px 26px;
  border-radius:999px;
  background:var(--red);
  color:#fff;
  font-size:16px;
  letter-spacing:.16em;
  text-decoration:none;
  transition:background .2s ease,transform .2s ease;
}
.cta-go:hover{background:#ff2b2b;transform:translateY(-1px)}

.foot-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
  margin:22px 0 18px;
  padding-top:20px;
  border-top:1px solid var(--line);
}
.foot-addr{font-style:normal}
.addr-name{
  display:inline-block;
  padding:6px 0;
  font-size:19px;
  letter-spacing:.08em;
}
.foot-list{margin:0;padding:0;list-style:none}
.foot-list li{list-style:none}
.foot-list a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:4px 0;
  color:var(--dim);
  font-size:16px;
  text-decoration:none;
}
.foot-list a:hover{color:#fff}

.foot-base{
  margin:0;
  padding-top:14px;
  border-top:1px solid var(--line);
  color:rgba(247,236,230,.55);
  font-size:16px;
  text-align:center;
}

/* 断点 */
@media (min-width:600px){
  .menu-panel a{font-size:24px}
  .prose>section{padding:28px 26px}
}

@media (min-width:760px){
  .foot-grid{grid-template-columns:1.15fr 1fr 1fr;gap:22px}
}

@media (min-width:900px){
  main{padding:30px 20px 0}
  .sheet{
    grid-template-columns:236px minmax(0,1fr);
    grid-template-areas:
      "rail hero"
      "rail prose";
    column-gap:34px;
    align-items:start;
  }
  .rail{position:sticky;top:132px;padding:18px}
  .rail-list{display:block}
  .rail-list li+li{margin-top:0}
  .rail-list a{
    display:block;
    min-height:44px;
    padding:9px 0;
    border:0;
    border-bottom:1px dashed rgba(255,255,255,.13);
    border-radius:0;
  }
  .rail-list a:hover{border-bottom-color:rgba(255,0,0,.55)}
  .hero{padding:34px 32px 28px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
  .js .prose>section{opacity:1;transform:none}
}

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