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

:root{
  --ink:#172620;
  --ink-deep:#0d1714;
  --mint:#b4fde1;
  --sky:#add8e6;
  --txt:#e2f4ea;
  --muted:#a8c3b6;
  --line:rgba(180,253,225,.28);
  --card:rgba(255,255,255,.035);
}

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

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

body{
  margin:0;
  font-family:'Public Sans',system-ui,-apple-system,'Segoe UI','Noto Sans SC',sans-serif;
  font-size:17px;
  line-height:1.75;
  color:var(--txt);
  background-color:var(--ink);
  background-image:
    radial-gradient(700px 430px at 6% -8%, rgba(180,253,225,.17), transparent 66%),
    radial-gradient(640px 470px at 102% 14%, rgba(173,216,230,.15), transparent 68%);
  overflow-x:hidden;
}

img{display:block;max-width:100%;height:auto}
a{color:var(--mint)}
:focus-visible{outline:3px dashed var(--sky);outline-offset:3px;border-radius:8px}

/* ---------- 顶栏 ---------- */
.brow{
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
  padding:14px clamp(14px,4vw,40px);
  border-bottom:3px solid var(--line);
  background:linear-gradient(90deg, rgba(180,253,225,.09), rgba(173,216,230,.07));
  position:relative;
  z-index:30;
}

.mark{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:8px 16px 8px 10px;
  border-radius:999px;
  border:3px solid rgba(180,253,225,.45);
  background:rgba(180,253,225,.10);
  color:var(--mint);
  text-decoration:none;
  font-family:'Libre Bodoni',Georgia,serif;
  font-size:19px;
  font-weight:600;
  letter-spacing:.01em;
  box-shadow:inset -2px -2px 7px rgba(0,0,0,.42), 3px 4px 0 rgba(180,253,225,.16);
  transition:transform .2s ease-out, box-shadow .2s ease-out;
}
.mark:active{transform:translateY(2px);box-shadow:inset -2px -2px 7px rgba(0,0,0,.5), 1px 1px 0 rgba(180,253,225,.16)}
.mark-img{width:30px;height:30px;border-radius:999px;border:2px solid var(--mint)}
.mark-txt{white-space:nowrap}

.board{
  margin-left:auto;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  align-items:center;
}

.grp{position:relative}

summary{
  list-style:none;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:9px 16px;
  border-radius:999px;
  border:3px solid var(--line);
  background:rgba(180,253,225,.08);
  color:var(--mint);
  font-size:16px;
  font-weight:600;
  letter-spacing:.04em;
  box-shadow:inset -2px -2px 6px rgba(0,0,0,.40), 3px 3px 0 rgba(180,253,225,.13);
  transition:transform .2s ease-out, background .2s ease-out;
  user-select:none;
}
summary::-webkit-details-marker{display:none}
summary:hover{background:rgba(180,253,225,.16)}
summary:active{transform:translateY(2px)}
summary::after{
  content:"";
  width:8px;height:8px;
  border-right:2px solid currentColor;
  border-bottom:2px solid currentColor;
  transform:rotate(45deg) translateY(-2px);
  transition:transform .2s ease-out;
}
details[open] > summary{background:rgba(180,253,225,.20);border-color:rgba(180,253,225,.6)}
details[open] > summary::after{transform:rotate(-135deg) translateY(-2px)}

.panel{
  position:absolute;
  top:calc(100% + 10px);
  left:0;
  min-width:196px;
  display:grid;
  gap:4px;
  padding:10px;
  border:3px solid var(--mint);
  border-radius:18px;
  background:var(--ink-deep);
  box-shadow:inset -3px -3px 10px rgba(0,0,0,.55), 6px 7px 0 rgba(0,0,0,.35);
  z-index:40;
}
.panel a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:10px 14px;
  border-radius:12px;
  border:2px solid transparent;
  color:var(--txt);
  text-decoration:none;
  font-size:16px;
  transition:background .2s ease-out, border-color .2s ease-out;
}
.panel a:hover{background:rgba(180,253,225,.14);border-color:var(--line)}

/* ---------- 满屏拼贴首屏 ---------- */
.hero{
  position:relative;
  isolation:isolate;
  min-height:100vh;
  display:grid;
  place-items:center;
  padding:clamp(40px,8vw,90px) clamp(20px,5vw,60px) clamp(90px,14vw,150px);
  overflow:hidden;
  color:var(--ink);
  background:
    radial-gradient(520px 380px at 88% 6%, rgba(255,255,255,.55), transparent 62%),
    linear-gradient(152deg, #b4fde1 0%, #c8f6e9 38%, #add8e6 100%);
  text-align:center;
}

.hero::before{
  content:"";
  position:absolute;
  inset:auto -15% -55% -15%;
  height:70%;
  border-radius:50%;
  background:radial-gradient(closest-side, rgba(255,255,255,.7), transparent 70%);
  z-index:0;
}

.hero-copy{position:relative;z-index:3;max-width:24ch}

h1{
  margin:0;
  font-family:'Libre Bodoni',Georgia,'Songti SC',serif;
  font-weight:700;
  font-size:clamp(30px,6.2vw,66px);
  line-height:1.08;
  letter-spacing:-.015em;
  color:var(--ink);
  text-shadow:2px 3px 0 rgba(255,255,255,.7);
}

.lede{
  margin:20px auto 0;
  max-width:40ch;
  font-size:17px;
  line-height:1.7;
  color:rgba(23,38,32,.82);
}

.collage-a,.collage-b{
  position:absolute;
  z-index:1;
  width:clamp(112px,19vw,236px);
  border:4px solid var(--ink);
  border-radius:22px;
  box-shadow:inset -3px -3px 0 rgba(255,255,255,.45), 8px 10px 0 rgba(23,38,32,.30);
}
.collage-a{
  top:8%;
  left:2%;
  transform:rotate(-7deg);
  animation:drift-a 10s ease-in-out infinite alternate;
}
.collage-b{
  bottom:15%;
  right:2%;
  transform:rotate(6deg);
  animation:drift-b 12s ease-in-out infinite alternate;
}

@keyframes drift-a{
  0%{transform:rotate(-7deg) translate3d(0,0,0)}
  100%{transform:rotate(-2deg) translate3d(0,-16px,0)}
}
@keyframes drift-b{
  0%{transform:rotate(6deg) translate3d(0,0,0)}
  100%{transform:rotate(1deg) translate3d(0,14px,0)}
}

.band{
  position:absolute;
  left:-10%;
  right:-10%;
  bottom:-34px;
  height:96px;
  z-index:2;
  background:var(--ink);
  transform:skewY(-3deg);
  box-shadow:0 -6px 0 rgba(23,38,32,.18);
}

/* ---------- 主体：左栏 + 正文 ---------- */
.stage{
  display:grid;
  grid-template-columns:minmax(0,236px) minmax(0,1fr);
  align-items:start;
  gap:clamp(20px,3vw,46px);
  max-width:1180px;
  margin:0 auto;
  padding:clamp(34px,6vw,74px) clamp(16px,4vw,40px) clamp(46px,8vw,92px);
}

.rail{
  position:sticky;
  top:18px;
  padding:18px 16px 20px;
  border:3px solid var(--line);
  border-radius:22px;
  background:rgba(180,253,225,.055);
  box-shadow:inset -3px -3px 11px rgba(0,0,0,.40), 6px 7px 0 rgba(180,253,225,.08);
}

.rail h2{
  margin:0 0 8px;
  font-family:'Libre Bodoni',Georgia,serif;
  font-size:19px;
  letter-spacing:.14em;
  color:var(--mint);
}
.rail hr{
  border:0;
  border-top:2px dashed rgba(180,253,225,.36);
  margin:0 0 12px;
}

.rail ol{list-style:none;margin:0;padding:0;display:grid;gap:3px}

.rail li{animation:rise .5s ease-out both;animation-delay:calc(var(--i) * 55ms)}

.rail a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:9px 8px;
  border:2px solid transparent;
  border-radius:12px;
  color:var(--txt);
  text-decoration:none;
  font-size:16px;
  line-height:1.35;
  transition:background .2s ease-out, border-color .2s ease-out, transform .2s ease-out;
}
.rail a:hover{background:rgba(180,253,225,.12);border-color:var(--line)}
.rail a:active{transform:translateY(2px)}
.rail a.on{background:rgba(180,253,225,.18);border-color:var(--mint);color:#fff}
.rail .num{
  font-family:'Libre Bodoni',Georgia,serif;
  font-size:14px;
  color:var(--mint);
  min-width:22px;
  opacity:.85;
}

@keyframes rise{
  from{opacity:0;transform:translate3d(-10px,6px,0)}
  to{opacity:1;transform:none}
}

.paper{min-width:0;max-width:72ch}

.paper > article{
  margin:0 0 26px;
  padding:clamp(18px,3vw,32px);
  border:3px solid rgba(180,253,225,.24);
  border-radius:0;
  background:var(--card);
  scroll-margin-top:24px;
  animation:rise .55s ease-out both;
}
.paper > article:nth-child(2){animation-delay:.04s}
.paper > article:nth-child(3){animation-delay:.08s}
.paper > article:nth-child(4){animation-delay:.12s}
.paper > article:nth-child(5){animation-delay:.16s}
.paper > article:nth-child(6){animation-delay:.20s}
.paper > article:nth-child(7){animation-delay:.24s}

.paper :is(h2,h3){font-family:'Libre Bodoni',Georgia,'Songti SC',serif;line-height:1.26}
.paper h2{
  margin:0 0 10px;
  font-size:clamp(22px,3.1vw,31px);
  color:var(--mint);
  letter-spacing:-.005em;
}
.paper h3{margin:22px 0 8px;font-size:20px;color:var(--sky)}
.paper hr{
  border:0;
  width:66px;
  height:3px;
  margin:0 0 18px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--mint),var(--sky));
}
.paper p{margin:0 0 14px}
.paper :is(ul,ol){margin:0 0 16px;padding-left:1.35em}
.paper li{margin:0 0 8px}
.paper a{color:var(--mint);text-underline-offset:3px}
.paper strong{color:#fff}
.paper blockquote{
  margin:0 0 16px;
  padding:6px 0 6px 16px;
  border-left:4px solid var(--sky);
  color:var(--muted);
}

/* ---------- 页脚 ---------- */
.base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px 26px;
  padding:clamp(24px,4vw,44px) clamp(16px,4vw,40px) 30px;
  border-top:3px solid var(--line);
  background:linear-gradient(180deg, rgba(180,253,225,.09), transparent 78%);
}

.footmark{display:flex;align-items:center;gap:14px;min-width:0}
.huge{
  font-family:'Libre Bodoni',Georgia,'Songti SC',serif;
  font-weight:700;
  font-size:clamp(26px,5vw,54px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--mint);
  text-shadow:3px 4px 0 rgba(23,38,32,.9);
}

.footnav dl{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:4px 12px;
  margin:0;
}
.footnav dt{color:var(--muted);font-size:16px}
.footnav dd{margin:0}
.footnav dd a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 14px;
  border:2px solid var(--line);
  border-radius:999px;
  color:var(--txt);
  text-decoration:none;
  font-size:16px;
  transition:background .2s ease-out, transform .2s ease-out;
}
.footnav dd a:hover{background:rgba(180,253,225,.14)}
.footnav dd a:active{transform:translateY(2px)}

.copy{color:var(--muted);font-size:16px}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .stage{grid-template-columns:minmax(0,1fr);gap:26px}
  .rail{position:static;order:-1}
  .rail ol{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:4px 8px}
  .paper{max-width:none}
}

@media (max-width:760px){
  .brow{flex-direction:column;align-items:stretch;gap:10px;padding-bottom:16px}
  .mark{align-self:flex-start}
  .board{margin-left:0;width:100%;gap:8px}
  .grp{flex:1 1 44%}
  summary{width:100%;justify-content:space-between;padding:9px 14px}
  .panel{position:static;margin-top:8px;border-radius:14px;box-shadow:inset -3px -3px 10px rgba(0,0,0,.5)}
  .hero{min-height:92vh;padding-bottom:120px}
  .collage-a,.collage-b{width:96px;opacity:.92}
  .collage-a{top:3%;left:0}
  .collage-b{bottom:8%;right:0}
  .base{flex-direction:column;align-items:flex-start;gap:14px}
  .footnav dl{gap:6px 10px}
}

@media (max-width:420px){
  .collage-a,.collage-b{width:84px}
  .hero{padding-left:16px;padding-right:16px}
  h1{font-size:clamp(26px,8.4vw,38px)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none !important;transition:none !important}
}

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