@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400&family=JetBrains+Mono:wght@400&family=Playfair+Display:ital@1&display=swap');

:root{
--ink:#0F0E0C;
--red:#C9432B;
--paper:#F4EFE7;
--line:rgba(244,239,231,.15);
--line2:rgba(244,239,231,.32);
--mute:rgba(244,239,231,.66);
--sans:'Inter','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,sans-serif;
--serif:'Playfair Display','Songti SC','Noto Serif SC','Source Han Serif SC',Georgia,serif;
--mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',monospace;
}

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

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

body{
margin:0;
background:var(--ink);
color:var(--paper);
font-family:var(--sans);
font-size:17px;
line-height:1.75;
overflow-x:hidden;
}

img{display:block;max-width:100%;height:auto}

a{color:inherit;text-decoration:none}

:focus-visible{outline:2px solid var(--red);outline-offset:3px;border-radius:6px}

/* 视差层 */
.layers{
position:fixed;
inset:-22% 0;
z-index:0;
pointer-events:none;
overflow:hidden;
}

.layer{position:absolute;inset:0;will-change:transform}

.layer-1{
background:radial-gradient(58% 44% at 80% 10%,rgba(201,67,43,.46),transparent 64%);
}

.layer-2{
background:
linear-gradient(rgba(244,239,231,.055) 1px,transparent 1px) 0 0/100% 104px,
linear-gradient(90deg,rgba(244,239,231,.042) 1px,transparent 1px) 0 0/104px 100%;
}

.layer-3{
background:radial-gradient(130% 76% at 50% 112%,rgba(15,14,12,.96),transparent 62%);
}

.page{
position:relative;
z-index:1;
display:grid;
grid-template-columns:238px minmax(0,1fr);
width:100%;
max-width:100%;
}

.stage{min-width:0;max-width:100%}

/* 左栏锚点 */
.rail{
position:sticky;
top:0;
align-self:start;
min-width:0;
height:100vh;
height:100dvh;
display:flex;
align-items:center;
padding:26px 16px;
border-right:1px solid var(--line);
background:linear-gradient(180deg,rgba(15,14,12,.92),rgba(15,14,12,.55));
backdrop-filter:blur(8px);
overflow:auto;
}

.rail-nav{width:100%;min-width:0;max-width:100%}

.rail-nav ul{
list-style:none;
margin:0;
padding:0;
display:flex;
flex-direction:column;
gap:8px;
}

.rail-nav a{
display:flex;
align-items:center;
min-height:44px;
padding:9px 14px;
border:1px solid var(--line);
border-radius:999px;
font-size:16px;
line-height:1.4;
color:var(--mute);
transition:color .25s ease,border-color .25s ease,background .25s ease,transform .25s ease;
}

.rail-nav a:hover,
.rail-nav a:focus-visible{
color:var(--paper);
border-color:var(--red);
background:rgba(201,67,43,.14);
transform:translateX(3px);
}

.rail-nav a[aria-current="true"]{
background:var(--red);
border-color:var(--red);
color:var(--paper);
}

/* 顶部条 */
.masthead{
position:sticky;
top:0;
z-index:6;
border-bottom:1px solid var(--line);
background:rgba(15,14,12,.84);
backdrop-filter:blur(12px);
}

.mast-inner{
display:grid;
grid-template-columns:1fr auto 1fr;
align-items:center;
gap:10px;
max-width:1120px;
margin:0 auto;
padding:8px 22px;
}

.mast-dot{
justify-self:start;
width:9px;
height:9px;
border-radius:50%;
background:var(--red);
box-shadow:0 0 0 4px rgba(201,67,43,.2);
}

.brand{
justify-self:center;
display:inline-flex;
align-items:center;
gap:8px;
min-height:44px;
font-family:var(--serif);
font-style:italic;
font-size:22px;
letter-spacing:.03em;
white-space:nowrap;
}

.logo{width:30px;height:30px;border-radius:8px}

.cta{
justify-self:end;
display:inline-flex;
align-items:center;
min-height:44px;
padding:8px 18px;
border-radius:999px;
background:var(--red);
color:var(--paper);
font-size:16px;
font-weight:600;
white-space:nowrap;
transition:background .25s ease,color .25s ease,transform .2s ease;
}

.cta:hover,.cta:focus-visible{
background:var(--paper);
color:var(--ink);
transform:translateY(-1px);
}

/* 主区 */
main{min-width:0}

.wrap{
min-width:0;
max-width:1060px;
margin:0 auto;
padding:0 26px;
}

.hero{
min-height:70vh;
display:flex;
align-items:center;
padding:64px 0 52px;
}

.hero-art{
width:100%;
min-width:0;
display:flex;
flex-direction:column;
align-items:center;
gap:18px;
text-align:center;
}

.badge{
display:inline-flex;
align-items:center;
padding:6px 15px;
border:1px solid var(--line2);
border-radius:999px;
font-family:var(--mono);
font-size:15px;
letter-spacing:.16em;
color:var(--mute);
}

h1{
margin:0;
max-width:100%;
font-family:var(--serif);
font-weight:700;
font-size:clamp(38px,7vw,84px);
line-height:1.06;
letter-spacing:-.015em;
text-shadow:0 24px 60px rgba(201,67,43,.24);
overflow-wrap:break-word;
}

.lede{
max-width:46ch;
margin:0;
font-size:17px;
line-height:1.8;
color:var(--mute);
overflow-wrap:break-word;
}

.hero-fig{
position:relative;
width:100%;
max-width:560px;
margin:6px 0 0;
padding:10px;
border:1px solid var(--line2);
border-radius:10px;
background:rgba(244,239,231,.03);
}

.hero-fig::before{
content:"";
position:absolute;
inset:16px -11px -11px 16px;
border:1px solid rgba(201,67,43,.55);
border-radius:10px;
z-index:-1;
}

.hero-img{
width:100%;
height:auto;
max-height:250px;
object-fit:cover;
border-radius:6px;
}

.cue{
display:inline-flex;
align-items:center;
gap:10px;
min-height:44px;
padding:6px 4px;
font-size:15px;
letter-spacing:.22em;
color:var(--mute);
}

.cue span{
display:block;
width:1px;
height:34px;
background:linear-gradient(var(--red),transparent);
animation:drip 2s ease-in-out infinite;
}

@keyframes drip{
0%,100%{transform:scaleY(.55);opacity:.4}
50%{transform:scaleY(1);opacity:1}
}

/* 正文 */
.chapters{padding:12px 0 96px;min-width:0}

.prose{
counter-reset:ch;
max-width:74ch;
min-width:0;
overflow-wrap:break-word;
}

.eyebrow{
display:block;
margin-bottom:8px;
font-family:var(--mono);
font-size:15px;
letter-spacing:.24em;
color:var(--red);
}

.prose h2{
margin:0 0 20px;
font-family:var(--serif);
font-weight:700;
font-size:clamp(26px,3.6vw,40px);
line-height:1.2;
letter-spacing:-.01em;
overflow-wrap:break-word;
}

.prose > section{
position:relative;
padding:48px 0 14px;
border-top:1px solid var(--line);
counter-increment:ch;
scroll-margin-top:112px;
min-width:0;
}

.prose > section + section{margin-top:26px}

.prose > section::before{
content:counter(ch,decimal-leading-zero);
position:absolute;
top:14px;
right:0;
font-family:var(--mono);
font-size:15px;
letter-spacing:.14em;
color:rgba(244,239,231,.34);
}

.prose > section h2{
padding-right:52px;
}

.prose > section h3{
margin:28px 0 8px;
font-family:var(--serif);
font-size:21px;
line-height:1.35;
}

.prose p{
margin:0 0 16px;
color:rgba(244,239,231,.86);
}

.prose ul,.prose ol{
margin:0 0 18px;
padding-left:22px;
}

.prose li{margin:0 0 8px}

.prose a{
color:var(--red);
border-bottom:1px solid rgba(201,67,43,.45);
overflow-wrap:break-word;
}

.prose a:hover{border-bottom-color:var(--red)}

.prose img,.prose video,.prose iframe{
margin:20px 0;
max-width:100%;
border:1px solid var(--line);
border-radius:10px;
}

.prose pre{
max-width:100%;
margin:20px 0;
padding:14px;
border:1px solid var(--line);
border-radius:10px;
overflow-x:auto;
font-family:var(--mono);
font-size:16px;
line-height:1.6;
}

.prose code{font-family:var(--mono);font-size:.95em;overflow-wrap:break-word}

.prose table{
display:block;
width:100%;
max-width:100%;
margin:20px 0;
border-collapse:collapse;
overflow-x:auto;
font-size:16px;
}

.prose th,.prose td{
padding:9px 12px;
border:1px solid var(--line);
text-align:left;
}

.prose blockquote{
margin:22px 0;
padding:4px 0 4px 20px;
border-left:2px solid var(--red);
color:var(--mute);
}

.prose strong{color:var(--paper)}

main [id]{scroll-margin-top:112px}

/* 页脚 */
footer{
position:relative;
z-index:1;
display:grid;
grid-template-columns:repeat(4,minmax(0,1fr));
gap:6px 22px;
max-width:1060px;
margin:0 auto;
padding:40px 26px 28px;
border-top:1px solid var(--line);
font-size:16px;
}

footer p{margin:0;min-width:0}

footer p a{
display:inline-flex;
align-items:center;
min-height:40px;
margin-right:10px;
color:var(--mute);
transition:color .2s ease;
}

footer p a:hover,footer p a:focus-visible{color:var(--red)}

.foot-brand{
font-family:var(--serif);
font-style:italic;
font-size:19px;
color:var(--paper);
}

footer small{
grid-column:1/-1;
margin-top:18px;
padding-top:16px;
border-top:1px solid var(--line);
text-align:center;
font-size:16px;
color:var(--mute);
overflow-wrap:break-word;
}

/* 滚动揭示 */
.rv{
opacity:0;
transform:translateY(26px);
transition:opacity .85s ease,transform .85s cubic-bezier(.19,1,.22,1);
}

.rv.in{opacity:1;transform:none}

@media (max-width:860px){
.page{grid-template-columns:minmax(0,1fr)}

.stage{min-width:0;max-width:100%}

.rail{
top:0;
height:auto;
min-width:0;
z-index:7;
padding:8px 12px;
border-right:0;
border-bottom:1px solid var(--line);
align-items:stretch;
overflow:hidden;
}

.rail-nav{width:100%;min-width:0;max-width:100%;overflow:hidden}

.rail-nav ul{
flex-direction:row;
gap:8px;
width:100%;
max-width:100%;
overflow-x:auto;
overscroll-behavior-x:contain;
scrollbar-width:none;
padding-bottom:2px;
}

.rail-nav ul::-webkit-scrollbar{display:none}

.rail-nav li{flex:0 0 auto}

.rail-nav a{white-space:nowrap;min-height:44px}

.masthead{position:static}

.mast-inner{
grid-template-columns:auto minmax(0,1fr) auto;
padding:8px 14px;
}

.brand{font-size:18px;min-width:0;overflow:hidden;text-overflow:ellipsis}

.cta{padding:8px 14px;font-size:16px}

.wrap{padding:0 16px}

.hero{min-height:auto;padding:40px 0 44px}

.hero-fig::before{inset:14px -9px -9px 14px}

.lede{max-width:none}

.prose{max-width:none}

.prose > section{padding-top:44px}

footer{grid-template-columns:repeat(2,minmax(0,1fr));padding:32px 16px 24px}
}

@media (max-width:400px){
.brand{font-size:17px}
.lede,.prose,footer{font-size:16px}
}

@media (prefers-reduced-motion:reduce){
html{scroll-behavior:auto}
.rv{opacity:1;transform:none;transition:none}
.cue span{animation:none}
.rail-nav a,.cta{transition:none}
}

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