@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400&family=Source+Serif+4:ital,wght@0,300;0,400;0,600;1,300&display=swap');

:root{
  --paper:#f5e6c8;
  --paper-2:#eedcb7;
  --slab:#fbf2de;
  --ink:#262117;
  --ink-2:#4b4132;
  --caramel:#d4a574;
  --caramel-2:#a9743c;
  --line:rgba(38,33,23,.16);
  --dock:66px;
  --serif:'Source Serif 4',Georgia,'Songti SC','SimSun',serif;
  --display:'Playfair Display',Georgia,'Songti SC',serif;
  --mono:'JetBrains Mono',ui-monospace,'Courier New',monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  padding-bottom:calc(var(--dock) + 30px);
  background:
    radial-gradient(120% 78% at 10% 0%, #f9eed6 0%, rgba(249,238,214,0) 58%),
    radial-gradient(95% 70% at 100% 26%, #ecd8b0 0%, rgba(236,216,176,0) 56%),
    var(--paper);
  color:var(--ink);
  font-family:var(--serif);
  font-size:17px;
  line-height:1.78;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--caramel-2);text-decoration:none;border-bottom:1px solid rgba(169,116,60,.34)}
a:hover{color:var(--ink);border-color:var(--ink)}
:focus-visible{outline:2px solid var(--caramel-2);outline-offset:3px}
hr{border:0;height:1px;margin:12px 0 20px;background:linear-gradient(90deg,var(--caramel-2),rgba(212,165,116,.1))}

/* 胶片颗粒 */
.grain{
  position:fixed;inset:-35%;z-index:8000;pointer-events:none;
  opacity:.32;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)' opacity='0.42'/%3E%3C/svg%3E");
  background-size:220px 220px;
  animation:grainShift 5s steps(4) infinite;
}
@keyframes grainShift{
  0%{transform:translate3d(0,0,0)}
  25%{transform:translate3d(-1.5%,1%,0)}
  50%{transform:translate3d(1%,-1.5%,0)}
  75%{transform:translate3d(-1%,-1%,0)}
  100%{transform:translate3d(0,0,0)}
}
/* 漏光 */
body::before{
  content:'';position:fixed;inset:0;z-index:7000;pointer-events:none;
  background:
    radial-gradient(38% 26% at 84% 3%, rgba(255,214,150,.5), rgba(255,214,150,0) 70%),
    radial-gradient(32% 22% at 4% 94%, rgba(212,124,62,.26), rgba(212,124,62,0) 72%);
  mix-blend-mode:screen;
  animation:leak 15s ease-in-out infinite alternate;
}
@keyframes leak{
  from{opacity:.55;transform:translate3d(0,0,0)}
  to{opacity:.95;transform:translate3d(-2%,1.4%,0)}
}

/* 首屏 */
.plat{
  position:relative;display:grid;place-items:center;overflow:hidden;
  min-height:100vh;min-height:100svh;
  background:linear-gradient(174deg,#382f1e 0%,#6b5335 46%,#a9835a 100%);
}
.plat-frame{position:absolute;inset:0;margin:0}
.plat-frame img{
  width:100%;height:100%;object-fit:cover;
  filter:sepia(.5) contrast(1.06) saturate(.72) brightness(.85);
  opacity:.82;
  transform:translate3d(0,var(--py,0px),0) scale(1.07);
  will-change:transform;
}
.plat::after{
  content:'';position:absolute;inset:0;z-index:1;
  background:
    radial-gradient(72% 58% at 50% 44%, rgba(38,33,23,.12), rgba(38,33,23,.76) 100%),
    linear-gradient(180deg,rgba(38,33,23,.52),rgba(38,33,23,.12) 42%,rgba(38,33,23,.82));
}
.plat-copy{position:relative;z-index:2;max-width:940px;padding:28px 22px;text-align:center}
.plat h1{
  margin:0;
  font-family:var(--display);font-weight:900;
  font-size:clamp(2.15rem,9.4vw,5rem);
  line-height:1.05;letter-spacing:.01em;
  color:#f9eed8;
  text-shadow:0 3px 28px rgba(0,0,0,.55);
  animation:trackIn .95s ease-out both;
}
@keyframes trackIn{
  0%{opacity:0;transform:skewX(6deg) translateY(16px);filter:blur(2px)}
  62%{opacity:1;transform:skewX(-1.5deg) translateY(0);filter:blur(0)}
  100%{transform:none;filter:blur(0)}
}

/* 版面 */
.split{
  display:grid;grid-template-columns:minmax(0,1fr);gap:26px;
  max-width:1140px;margin:0 auto;padding:32px 18px 0;
}
@media (min-width:920px){
  .split{grid-template-columns:minmax(0,1fr) 264px;gap:54px;padding:56px 36px 0;align-items:start}
}
.content{min-width:0}
.content > section{
  background:var(--slab);
  border-radius:4px;
  padding:24px 20px;
  margin:0 0 22px;
  scroll-margin-top:26px;
  box-shadow:0 1px 0 rgba(38,33,23,.1),0 14px 30px -26px rgba(38,33,23,.75);
}
@media (min-width:700px){.content > section{padding:34px 34px}}
.content > section:target{box-shadow:0 0 0 2px var(--caramel),0 14px 30px -26px rgba(38,33,23,.8)}
.content h2{
  margin:0;
  font-family:var(--display);font-weight:700;
  font-size:clamp(1.34rem,4.4vw,1.88rem);
  line-height:1.26;letter-spacing:.01em;
}
.content h3{font-family:var(--display);font-size:1.15rem;margin:22px 0 8px;letter-spacing:.01em}
.content p{margin:0 0 14px}
.content ul,.content ol{margin:0 0 16px;padding-left:1.2em}
.content li{margin:0 0 8px}
.content blockquote{
  margin:18px 0;padding:6px 0 6px 18px;
  border-left:2px solid var(--caramel);
  color:var(--ink-2);font-style:italic;
}
.content img{border-radius:4px;margin:14px 0;filter:sepia(.22) contrast(1.03) saturate(.9);height:auto}
.content figure{margin:16px 0}
.content figcaption{font-size:.95rem;color:var(--ink-2);margin-top:6px}
.content table{
  display:block;overflow-x:auto;
  width:100%;border-collapse:collapse;margin:14px 0;font-size:.97rem;
}
.content th,.content td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left}
.content strong{font-weight:600}
.content code{font-family:var(--mono);font-size:.92rem;background:rgba(38,33,23,.07);padding:1px 5px;border-radius:3px}

/* 右栏 */
.rail{
  background:var(--paper-2);border-radius:4px;
  padding:18px 16px 20px;scroll-margin-top:26px;
}
@media (min-width:920px){.rail{position:sticky;top:26px}}
.rail h2{margin:0;font-family:var(--display);font-size:1.02rem;font-weight:700;letter-spacing:.14em}
.rail hr{margin:8px 0 12px}
.rail-list{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.rail-list a{
  display:block;padding:9px 6px;min-height:42px;
  font-size:.98rem;color:var(--ink);
  border-bottom:1px solid rgba(38,33,23,.09);border-radius:3px;
}
.rail-list a:hover{background:rgba(212,165,116,.34);border-color:transparent}

/* 底部导航条 */
.dock{
  position:fixed;left:0;right:0;bottom:0;z-index:9000;
  display:flex;align-items:stretch;justify-content:space-between;
  height:var(--dock);
  background:rgba(38,33,23,.97);
  color:var(--paper);
  border-top:1px solid rgba(245,230,200,.22);
}
.dock-drawer{position:relative;display:flex;flex:0 0 auto}
.dock-drawer > summary{
  display:flex;align-items:center;justify-content:center;
  height:100%;min-width:66px;padding:0 14px;
  cursor:pointer;user-select:none;
  font-size:.95rem;letter-spacing:.16em;color:var(--paper);
  list-style:none;
}
.dock-drawer > summary::-webkit-details-marker{display:none}
.dock-drawer > summary::marker{content:''}
.dock-drawer[open] > summary{background:rgba(245,230,200,.14);color:#fbf1dc}
.dock-drawer menu{
  position:absolute;bottom:calc(100% - 1px);left:0;
  margin:0;padding:8px;list-style:none;min-width:186px;
  display:grid;gap:2px;
  background:#262117;
  border:1px solid rgba(245,230,200,.2);border-bottom:0;
  border-radius:4px 4px 0 0;
  box-shadow:0 -14px 26px -18px rgba(0,0,0,.85);
}
.dock-drawer.dock-right menu{left:auto;right:0}
.dock-drawer menu a{
  display:flex;align-items:center;min-height:44px;padding:0 12px;
  color:var(--paper);font-size:.98rem;border-bottom:1px solid rgba(245,230,200,.14);border-radius:3px;
}
.dock-drawer menu a:hover{background:rgba(212,165,116,.3);color:#fff8e8;border-color:transparent}
.dock-brand{
  flex:1 1 auto;display:flex;align-items:center;justify-content:center;
  min-height:100%;padding:0 8px;text-align:center;
  font-family:var(--display);font-weight:700;font-size:1.02rem;letter-spacing:.2em;
  color:#fbf1dc;border:0;
}
.dock-brand:hover{color:#fff}

/* 页脚 */
.plate-wrap{
  margin-top:52px;padding:34px 18px 26px;
  background:#ecdfbf;
  border-top:1px solid var(--line);
}
.plate{max-width:1140px;margin:0 auto;display:grid;grid-template-columns:1fr;gap:20px}
@media (min-width:760px){
  .plate{grid-template-columns:repeat(3,minmax(0,1fr));gap:30px;padding:0 18px}
}
.cta{
  grid-column:1/-1;
  background:var(--ink);color:var(--paper);
  border-radius:4px;padding:30px 22px;text-align:center;
}
.cta h2{
  margin:0;font-family:var(--display);font-weight:900;
  font-size:clamp(1.6rem,6vw,2.45rem);color:#fbf1dc;
}
.cta hr{background:linear-gradient(90deg,rgba(212,165,116,0),var(--caramel),rgba(212,165,116,0));margin:12px 0 16px}
.cta a{
  display:inline-flex;align-items:center;min-height:46px;padding:0 26px;
  border:1px solid var(--caramel);border-radius:4px;
  color:#fbf1dc;letter-spacing:.16em;font-size:.98rem;
  transition:background .2s ease,color .2s ease;
}
.cta a:hover{background:var(--caramel);color:#262117;border-color:var(--caramel)}
.fcol{display:grid;gap:2px;align-content:start}
.fmark{
  font-family:var(--display);font-weight:700;font-size:1.08rem;letter-spacing:.16em;
  color:var(--ink);border:0;padding:2px 0 10px;
}
.fcol a:not(.fmark){
  display:flex;align-items:center;min-height:42px;padding:0 4px;
  font-size:.98rem;color:var(--ink-2);
  border-bottom:1px solid rgba(38,33,23,.12);border-radius:3px;
}
.fcol a:not(.fmark):hover{color:var(--ink);border-color:var(--caramel-2);background:rgba(212,165,116,.22)}
.legal{
  grid-column:1/-1;text-align:center;
  font-size:.95rem;color:var(--ink-2);letter-spacing:.08em;
  padding-top:14px;border-top:1px solid var(--line);
}

/* 入场 */
.rise{opacity:0;transform:translateY(16px);transition:opacity .62s ease,transform .62s ease}
.rise.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .grain,body::before,.plat h1{animation:none}
  .rise{opacity:1;transform:none;transition:none}
  .cta a{transition:none}
}

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