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

:root{
  --blue:#3bb1ff;
  --coral:#ff5252;
  --ink:#000000;
  --paper:#ffffff;
  --tint:#eaf7ff;
  --tint2:#fff0ee;
  --sun:#ffdb58;
  --line:3px solid var(--ink);
  --drop:6px 6px 0 var(--ink);
  --r:18px;
  --edge:clamp(16px,4vw,40px);
}

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

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

body{
  margin:0;
  font-family:'Space Grotesk','DM Sans',system-ui,-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.68;
  color:var(--ink);
  background:var(--paper);
}

p{margin:0 0 1em}
img{display:block;max-width:100%;height:auto}
a{color:var(--ink)}
:focus-visible{outline:3px solid var(--coral);outline-offset:2px}

small{
  display:inline-block;
  font-family:'DM Sans',sans-serif;
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.18em;
  background:var(--coral);
  border:var(--line);
  border-radius:999px;
  padding:2px 10px;
  color:var(--ink);
  margin-bottom:6px;
}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:60;
  display:grid;
  grid-template-columns:1fr auto;
  align-items:center;
  background:var(--paper);
  border-bottom:var(--line);
}

.brandline{
  grid-column:1 / -1;
  display:flex;
  align-items:center;
  gap:12px;
  padding:8px var(--edge);
  background:var(--blue);
  border-bottom:var(--line);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:46px;
  text-decoration:none;
}

.brandmark{
  width:40px;
  height:40px;
  display:grid;
  place-items:center;
  font-weight:700;
  font-size:1.15rem;
  background:var(--sun);
  border:var(--line);
  box-shadow:4px 4px 0 var(--ink);
  border-radius:8px;
  object-fit:cover;
  transform:rotate(-4deg);
}

.brandtext{
  font-weight:700;
  font-size:1.18rem;
  letter-spacing:.02em;
}

.menuline{
  grid-column:2;
  grid-row:2;
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px var(--edge) 10px 10px;
}

.navswitch{
  position:absolute;
  width:1px;
  height:1px;
  opacity:0;
  pointer-events:none;
}

.menu-toggle{
  display:none;
  align-items:center;
  min-height:46px;
  padding:10px 16px;
  font-size:1rem;
  font-weight:700;
  background:var(--sun);
  border:var(--line);
  box-shadow:4px 4px 0 var(--ink);
  border-radius:10px;
  cursor:pointer;
  user-select:none;
}

.search{
  display:flex;
  align-items:center;
  border:var(--line);
  border-radius:10px;
  overflow:hidden;
  background:var(--paper);
}
.search input{
  border:0;
  width:clamp(96px,14vw,170px);
  min-height:46px;
  padding:8px 12px;
  font:inherit;
  font-size:.95rem;
  background:transparent;
}
.search input:focus{outline:none;background:var(--tint)}
.search button{
  border:0;
  border-left:var(--line);
  background:var(--coral);
  color:var(--ink);
  font:inherit;
  font-weight:700;
  padding:0 14px;
  min-height:46px;
  cursor:pointer;
}

.mainnav{
  grid-column:1;
  grid-row:2;
  padding-left:var(--edge);
}

.menu{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  list-style:none;
  margin:0;
  padding:8px 0;
}

.menu > li{position:relative}

.menu > li > a{
  display:block;
  padding:11px 14px;
  font-weight:600;
  font-size:.97rem;
  text-decoration:none;
  border:3px solid transparent;
  border-radius:10px;
  white-space:nowrap;
}

.menu > li > a:hover,
.menu > li > a:focus-visible{
  background:var(--coral);
  border-color:var(--ink);
  box-shadow:3px 3px 0 var(--ink);
}

.menu-group > a::after{
  content:"";
  display:inline-block;
  width:7px;
  height:7px;
  margin-left:8px;
  border-right:3px solid var(--ink);
  border-bottom:3px solid var(--ink);
  transform:translateY(-3px) rotate(45deg);
}

.submenu{
  position:absolute;
  left:0;
  top:100%;
  z-index:70;
  min-width:180px;
  margin:6px 0 0;
  padding:8px;
  list-style:none;
  background:var(--paper);
  border:var(--line);
  border-radius:12px;
  box-shadow:var(--drop);
  opacity:0;
  visibility:hidden;
  transform:translateY(-6px);
  transition:opacity .16s ease,transform .16s ease,visibility .16s;
}

.menu-group:hover .submenu,
.menu-group:focus-within .submenu{
  opacity:1;
  visibility:visible;
  transform:none;
}

.submenu a{
  display:block;
  padding:10px 12px;
  min-height:44px;
  text-decoration:none;
  font-size:.94rem;
  border-radius:8px;
}
.submenu a:hover{background:var(--tint);box-shadow:inset 0 0 0 3px var(--ink)}

/* ---------- 主体 ---------- */
.main{
  max-width:1240px;
  margin:0 auto;
}

.hero{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  align-items:center;
  gap:clamp(20px,4vw,48px);
  padding:clamp(22px,4vw,48px) var(--edge) clamp(62px,9vw,104px);
  min-height:calc(100svh - 118px);
}

.hero::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:clamp(34px,5vw,58px);
  background:var(--coral);
  border-top:var(--line);
  clip-path:polygon(0 66%,100% 0,100% 100%,0 100%);
}

.hero-copy{position:relative;z-index:2}

.hero h1{
  margin:0 0 22px;
  font-size:clamp(1.9rem,6.2vw,4rem);
  line-height:1.06;
  letter-spacing:-.02em;
  font-weight:700;
  text-wrap:balance;
  text-shadow:4px 4px 0 var(--blue);
}

.hero-desc{
  max-width:46ch;
  margin:0 0 26px;
  padding-left:14px;
  border-left:6px solid var(--coral);
  font-size:1.02rem;
}

.hero-cta{
  display:inline-block;
  padding:14px 24px;
  min-height:48px;
  font-weight:700;
  text-decoration:none;
  background:var(--sun);
  border:var(--line);
  border-radius:12px;
  box-shadow:var(--drop);
}
.hero-cta:hover{background:var(--coral);transform:translate(-1px,-1px);box-shadow:8px 8px 0 var(--ink)}

.hero-figure{
  margin:0;
  border:var(--line);
  border-radius:var(--r);
  box-shadow:10px 10px 0 var(--ink);
  overflow:hidden;
  background:var(--tint);
  position:relative;
  z-index:2;
}

.hero-img{
  width:100%;
  aspect-ratio:4 / 3;
  object-fit:cover;
}

.hero-plate{
  position:relative;
  aspect-ratio:4 / 3;
  background:var(--blue);
  overflow:hidden;
}
.hero-plate::after{
  content:"";
  position:absolute;
  right:-8%;
  bottom:-18%;
  width:62%;
  aspect-ratio:1;
  background:var(--coral);
  border:var(--line);
  border-radius:50%;
}

/* ---------- 正文舞台 ---------- */
.stage{
  display:grid;
  grid-template-columns:minmax(0,1fr) 21rem;
  gap:clamp(18px,2.4vw,26px) clamp(20px,3vw,34px);
  align-items:start;
  padding:clamp(30px,5vw,54px) var(--edge) clamp(40px,6vw,70px);
  border-top:var(--line);
  background:var(--tint2);
}

.stage > div{
  background:var(--paper);
  border:var(--line);
  border-radius:var(--r);
  box-shadow:var(--drop);
  padding:clamp(18px,3vw,30px);
  scroll-margin-top:150px;
}

.stage > div:nth-child(even){background:var(--tint)}

.stage div h2{
  margin:.1em 0 .6em;
  font-size:clamp(1.3rem,2.6vw,1.85rem);
  line-height:1.28;
  letter-spacing:-.01em;
}

.stage div h3{
  margin:1.5em 0 .4em;
  font-size:1.12rem;
  line-height:1.4;
}

.stage div ul,
.stage div ol{margin:0 0 1.1em;padding-left:1.35em}
.stage div li{margin:.35em 0}

.stage div a{
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
.stage div a:hover{background:var(--sun)}

.stage div blockquote{
  margin:1.2em 0;
  padding:14px 16px;
  background:var(--tint2);
  border-left:8px solid var(--coral);
  border-radius:0 12px 12px 0;
  font-weight:500;
}

.stage div figure{
  margin:1.3em 0;
  border:var(--line);
  border-radius:12px;
  overflow:hidden;
  box-shadow:5px 5px 0 var(--ink);
  background:var(--paper);
}
.stage div figure img{width:100%}
.stage div figcaption{
  padding:8px 12px;
  font-size:.85rem;
  background:var(--tint);
  border-top:var(--line);
}

.stage div table{
  width:100%;
  border-collapse:collapse;
  margin:1.2em 0;
  font-size:.95rem;
}
.stage div th,
.stage div td{
  border:var(--line);
  padding:8px 10px;
  text-align:left;
  vertical-align:top;
}
.stage div th{background:var(--sun)}

.stage div code{
  font-family:'DM Sans',ui-monospace,monospace;
  background:var(--tint);
  border:2px solid var(--ink);
  border-radius:6px;
  padding:0 4px;
  font-size:.9em;
}

/* ---------- 右侧栏 ---------- */
.rail{
  grid-column:2;
  grid-row:1 / span 99;
  align-self:start;
  position:sticky;
  top:98px;
  background:var(--paper);
  border:var(--line);
  border-radius:var(--r);
  box-shadow:var(--drop);
  padding:18px;
}

.rail h2{
  margin:0 0 .7em;
  font-size:1.12rem;
  line-height:1.3;
}

.rail-list{
  list-style:none;
  margin:0 0 16px;
  padding:0;
}

.rail-list li + li{border-top:2px solid var(--tint)}

.rail-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:8px 4px;
  text-decoration:none;
  font-size:.95rem;
  font-weight:500;
}

.rail-list a:hover{background:var(--tint)}

.idx{
  font-family:'DM Sans',monospace;
  font-weight:700;
  color:var(--blue);
  font-size:.85rem;
  letter-spacing:.06em;
}

.rail-top{
  display:block;
  text-align:center;
  padding:11px 8px;
  min-height:44px;
  font-weight:700;
  font-size:.92rem;
  text-decoration:none;
  background:var(--blue);
  border:var(--line);
  border-radius:10px;
}

/* ---------- 页脚 ---------- */
.footwrap{
  background:#0b0b0b;
  color:#fff;
  border-top:var(--line);
}

.foot{
  max-width:1240px;
  margin:0 auto;
  padding:clamp(26px,4vw,44px) var(--edge) 22px;
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,32px);
}

.foot a{color:#fff}
.foot small{background:var(--sun);color:var(--ink)}
.foot h2{
  margin:0 0 .7em;
  font-size:1.05rem;
  letter-spacing:.02em;
}

.foot .brand{
  font-size:1.1rem;
  font-weight:700;
  text-decoration:none;
}

.foot-top{
  display:inline-block;
  margin-top:14px;
  padding:10px 16px;
  min-height:44px;
  font-size:.92rem;
  font-weight:700;
  text-decoration:none;
  border:3px solid #fff;
  border-radius:10px;
}
.foot-top:hover{background:#fff;color:var(--ink)}

.foot ul{list-style:none;margin:0;padding:0}
.foot li a{
  display:block;
  padding:10px 0;
  min-height:44px;
  text-decoration:none;
  border-bottom:2px solid #2b2b2b;
}
.foot li a:hover{color:var(--sun)}

.foot-info p{font-size:.95rem;color:#dcdcdc}
.foot-host{word-break:break-all;font-size:.86rem !important}

.foot-base{
  grid-column:1 / -1;
  border-top:3px solid #333;
  padding-top:14px;
  text-align:center;
  font-size:.9rem;
  color:#cfcfcf;
}
.foot-base p{margin:0}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference){
  .rail-list li,
  .foot-nav li{animation:rise .45s cubic-bezier(.2,.7,.3,1) both}
  .rail-list li:nth-child(1),
  .foot-nav li:nth-child(1){animation-delay:.04s}
  .rail-list li:nth-child(2),
  .foot-nav li:nth-child(2){animation-delay:.08s}
  .rail-list li:nth-child(3),
  .foot-nav li:nth-child(3){animation-delay:.12s}
  .rail-list li:nth-child(4),
  .foot-nav li:nth-child(4){animation-delay:.16s}
  .rail-list li:nth-child(5),
  .foot-nav li:nth-child(5){animation-delay:.2s}
  .rail-list li:nth-child(6),
  .foot-nav li:nth-child(6){animation-delay:.24s}
  .rail-list li:nth-child(7),
  .foot-nav li:nth-child(7){animation-delay:.28s}

  body.anim .stage > div,
  body.anim .foot > div{
    opacity:0;
    transform:translateY(16px);
    transition:opacity .5s ease,transform .5s ease;
  }
  body.anim .stage > div.in,
  body.anim .foot > div.in{opacity:1;transform:none}
}

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

/* ---------- 断点 ---------- */
@media (max-width:1080px){
  .stage{grid-template-columns:minmax(0,1fr)}
  .rail{grid-column:auto;grid-row:auto;position:static}
  .foot{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:900px){
  .topbar{grid-template-columns:1fr}
  .menuline{grid-column:1;grid-row:2;justify-content:space-between;padding:10px var(--edge)}
  .menu-toggle{display:inline-flex}
  .mainnav{grid-column:1;grid-row:3;padding:0;border-top:var(--line);display:none}
  .topbar:has(#navswitch:checked) .mainnav{display:block}
  .menu{flex-direction:column;align-items:stretch;gap:2px;padding:10px var(--edge) 16px}
  .menu > li > a{padding:12px 12px;min-height:44px}
  .submenu{
    position:static;
    opacity:1;
    visibility:visible;
    transform:none;
    margin:2px 0 6px 14px;
    box-shadow:none;
    border-width:3px;
  }
  .hero{grid-template-columns:minmax(0,1fr);min-height:0;padding-bottom:clamp(48px,12vw,70px)}
  .hero-figure{order:2}
  .hero h1{font-size:clamp(1.85rem,8.4vw,2.6rem);text-shadow:3px 3px 0 var(--blue)}
  .hero-cta{margin-bottom:6px}
  .stage > div{scroll-margin-top:132px}
}

@media (max-width:640px){
  body{font-size:16px}
  .search input{width:100%;flex:1}
  .search{flex:1}
  .foot{grid-template-columns:minmax(0,1fr)}
}

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