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

:root{
  --paper:#fdfbf7;
  --ash:#f5f5f5;
  --ink:#1a1a1a;
  --rule:#e0e0e0;
  --mute:#5a5750;
  --serif:'Noto Naskh Arabic','Songti SC','Noto Serif CJK SC','Source Han Serif SC',Georgia,serif;
  --sans:'Noto Sans Arabic','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;border-radius:0}

html{
  scroll-behavior:smooth;
  background:var(--paper);
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.012em;
  text-rendering:optimizeLegibility;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:1;
  pointer-events:none;
  opacity:.3;
  mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
}

html.veil-open{overflow:hidden}

a{color:var(--ink)}
a:hover{color:var(--ink)}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px}

.jump{
  position:absolute;
  left:-9999px;
  top:8px;
  z-index:95;
  background:var(--ink);
  color:var(--paper);
  padding:12px 16px;
  text-decoration:none;
  font-size:16px;
}
.jump:focus{left:8px}

/* ---------- 报头 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:70;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:8px 14px;
  background:var(--paper);
  border-bottom:1px solid var(--ink);
}

.mark{
  font-family:var(--serif);
  font-weight:700;
  font-size:22px;
  line-height:1.4;
  letter-spacing:.14em;
  text-decoration:none;
  color:var(--ink);
  padding:8px 2px;
  display:inline-flex;
  align-items:center;
  min-height:44px;
}

.tools{display:flex;align-items:center;gap:8px}

.cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 14px;
  background:var(--ink);
  color:var(--paper);
  text-decoration:none;
  font-size:16px;
  line-height:1.3;
  letter-spacing:.08em;
}
.cta:hover{background:var(--paper);color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}

.burger{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:10px 12px;
  background:transparent;
  border:1px solid var(--ink);
  color:var(--ink);
  font-family:inherit;
  font-size:16px;
  line-height:1.3;
  cursor:pointer;
}
.burger-glyph{
  width:18px;
  height:10px;
  border-top:2px solid var(--ink);
  border-bottom:2px solid var(--ink);
  display:block;
}
.burger:hover{background:var(--ash)}

/* ---------- 全屏菜单 ---------- */
.veil{
  position:fixed;
  inset:0;
  z-index:60;
  display:none;
  overflow:auto;
  padding:86px 20px 48px;
  background:var(--paper);
  border-top:6px solid var(--ink);
}
.veil.open{display:block}
.veil nav ul{list-style:none;margin:0;padding:0}
.veil nav li + li{border-top:1px solid var(--rule)}
.veil nav a{
  display:flex;
  align-items:center;
  min-height:56px;
  padding:14px 2px;
  text-decoration:none;
  color:var(--ink);
  font-family:var(--serif);
  font-size:21px;
  line-height:1.4;
  letter-spacing:.05em;
}
.veil nav a:hover{background:var(--ash);padding-left:12px}

@keyframes rise{
  from{opacity:0;transform:translateY(8px)}
  to{opacity:1;transform:translateY(0)}
}
.veil.open nav li{animation:rise .18s steps(4,end) both}
.veil.open nav li:nth-child(1){animation-delay:0s}
.veil.open nav li:nth-child(2){animation-delay:.03s}
.veil.open nav li:nth-child(3){animation-delay:.06s}
.veil.open nav li:nth-child(4){animation-delay:.09s}
.veil.open nav li:nth-child(5){animation-delay:.12s}
.veil.open nav li:nth-child(6){animation-delay:.15s}
.veil.open nav li:nth-child(7){animation-delay:.18s}

/* ---------- 骨架 ---------- */
.shell{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:28px;
  max-width:1180px;
  margin:0 auto;
  padding:0 18px;
}
@media (min-width:920px){
  .shell{grid-template-columns:minmax(0,1fr) 236px;gap:56px;padding:0 32px}
}

main{min-width:0}
.sheet{max-width:70ch}

main section[id]{scroll-margin-top:96px}

/* ---------- 首屏 ---------- */
.hero{
  display:grid;
  gap:22px;
  padding:28px 0 34px;
  min-height:70vh;
  align-content:start;
}
@media (min-width:820px){
  .hero{
    grid-template-columns:1.02fr .98fr;
    align-items:center;
    gap:40px;
    padding:56px 0 64px;
  }
}

.hero-copy{text-align:right}
h1{
  font-family:var(--serif);
  font-size:clamp(29px,7.4vw,54px);
  line-height:1.16;
  letter-spacing:.01em;
  font-weight:700;
  margin:0 0 16px;
}
.lede{
  margin:0 0 0 auto;
  max-width:36ch;
  color:var(--mute);
  font-size:17px;
  line-height:1.85;
  border-right:2px solid var(--ink);
  padding-right:14px;
}

.hero-plates{
  position:relative;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
  align-items:start;
}
.plate{
  margin:0;
  position:relative;
  background:var(--ash);
  border:1px solid var(--rule);
}
.plate-a{transform:translateY(-12px)}
.plate-b{transform:translateY(16px)}
.plate-img{
  display:block;
  width:100%;
  height:auto;
  filter:grayscale(1) contrast(1.06);
}
.stamp{
  position:absolute;
  left:0;
  bottom:0;
  font-style:normal;
  font-size:13px;
  letter-spacing:.18em;
  line-height:1.6;
  padding:2px 7px;
  background:var(--ink);
  color:var(--paper);
}

/* ---------- 正文 ---------- */
.sheet-body section{
  padding:38px 0 30px;
  border-top:1px solid var(--rule);
}
.sheet-body section:first-child{border-top:1px solid var(--ink)}

.sheet-body h2,
.sheet-body h3{
  font-family:var(--serif);
  line-height:1.32;
  letter-spacing:.02em;
  margin:0 0 8px;
}
.sheet-body h2{font-size:clamp(22px,3.2vw,30px)}
.sheet-body h3{font-size:clamp(18px,2.4vw,22px)}

hr{
  height:0;
  border:0;
  border-top:1px solid var(--rule);
  margin:0 0 20px;
}
h2 + hr,
h3 + hr{border-top:3px solid var(--ink);margin-top:2px}

.sheet-body p{margin:0 0 1.1em}
.sheet-body p:last-child{margin-bottom:0}

.sheet-body ul,
.sheet-body ol{margin:0 0 1.2em;padding-left:1.35em}
.sheet-body li{margin:0 0 .5em}
.sheet-body li::marker{color:var(--mute)}

.sheet-body blockquote{
  margin:0 0 1.3em;
  padding:6px 0 6px 16px;
  border-left:3px solid var(--ink);
  color:var(--mute);
}

.sheet-body a{
  text-decoration:none;
  border-bottom:1px solid var(--ink);
}
.sheet-body a:hover{background:var(--ink);color:var(--paper)}

.sheet-body img{
  display:block;
  max-width:100%;
  height:auto;
  filter:grayscale(1) contrast(1.05);
  margin:0 0 1.2em;
}

.sheet-body strong{font-weight:700}

/* ---------- 右栏 ---------- */
.rail{
  min-width:0;
  padding:28px 0 0;
  border-top:4px solid var(--ink);
}
@media (min-width:920px){
  .rail{
    position:sticky;
    top:78px;
    align-self:start;
    border-top:0;
    padding:56px 0 32px;
  }
}
.rail h2{
  font-family:var(--sans);
  font-size:16px;
  font-weight:700;
  letter-spacing:.34em;
  margin:0 0 8px;
  line-height:1.5;
}
.rail hr{border-top:4px solid var(--ink);margin:0 0 10px}
.rail ul{list-style:none;margin:0;padding:0}
.rail li + li{border-top:1px solid var(--rule)}
.rail a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:10px 2px;
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
  line-height:1.5;
}
.rail a:hover{background:var(--ash);padding-left:8px}
.rail a.on{font-weight:700;box-shadow:inset 3px 0 0 var(--ink);padding-left:8px}

.to-top{margin:12px 0 0}
.to-top a{
  border-top:1px solid var(--ink);
  font-size:16px;
  color:var(--mute);
}

/* ---------- 页脚 ---------- */
.colophon{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:18px 20px;
  margin-top:44px;
  padding:30px 18px 22px;
  border-top:1px solid var(--ink);
  background:var(--ash);
  font-size:16px;
  line-height:1.6;
}
@media (min-width:760px){
  .colophon{
    grid-template-columns:1.5fr 1fr 1fr 1fr;
    padding:40px 32px 24px;
    gap:20px 24px;
  }
}
.colophon p{margin:0}
.colophon p a{
  display:flex;
  align-items:center;
  min-height:44px;
  text-decoration:none;
  color:var(--ink);
  border-bottom:1px solid var(--rule);
}
.colophon p a:hover{background:var(--ink);color:var(--paper)}
.col-brand strong{
  font-family:var(--serif);
  font-size:20px;
  letter-spacing:.14em;
  font-weight:700;
  display:block;
  padding:10px 0;
}
.colophon small{
  grid-column:1 / -1;
  display:block;
  padding-top:14px;
  border-top:1px solid var(--rule);
  color:var(--mute);
  font-size:16px;
  letter-spacing:.06em;
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .veil.open nav li{animation:none}
}

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