@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@400;500;600;700&family=Nunito:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#171f26;
  --ink-2:#3f5060;
  --ink-3:#5c6f7f;
  --blue:#c8e0f4;
  --pink:#f5e0e8;
  --r:16px;
  --r-lg:28px;
  --raise:-6px -6px 16px rgba(255,255,255,.95), 7px 9px 22px rgba(23,31,38,.15);
  --raise-sm:-4px -4px 10px rgba(255,255,255,.92), 5px 6px 14px rgba(23,31,38,.13);
  --sink:inset -4px -4px 10px rgba(255,255,255,.95), inset 4px 5px 12px rgba(23,31,38,.16);
  --face:linear-gradient(145deg,#f2f7fc,#e0eaf5);
}

*{box-sizing:border-box}

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

html.drawer-open body{overflow:hidden}

body{
  margin:0;
  font-family:'Nunito','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  font-size:17px;
  line-height:1.78;
  color:var(--ink);
  background:linear-gradient(150deg,#e6eef8 0%,#edf1f9 46%,#f7ecf2 100%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  min-height:100%;
}

h1,h2,h3,.brand,summary,.drawer menu a{
  font-family:'Fredoka','Nunito','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
}

a{color:#1d4d6b}
img{max-width:100%}

/* 顶部条 —— 品牌居中，菜单在左，联系入口在右 */
.top{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(234,241,248,.9);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  box-shadow:0 8px 20px rgba(23,31,38,.08);
}

.bar{
  max-width:1180px;
  margin:0 auto;
  padding:10px 18px;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:10px;
}

.brand{
  justify-self:center;
  font-size:20px;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--ink);
  text-decoration:none;
  padding:6px 10px;
  border-radius:12px;
}

.brand:hover{box-shadow:var(--sink)}

.contact{
  justify-self:end;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  border-radius:999px;
  font-size:16px;
  text-decoration:none;
  color:var(--ink-2);
  background:var(--face);
  box-shadow:var(--raise-sm);
  transition:box-shadow .15s ease,transform .15s ease;
}

.contact:hover{color:var(--ink);box-shadow:var(--raise)}
.contact:active{transform:scale(.97);box-shadow:var(--sink)}

/* 汉堡 / 全屏遮罩菜单 */
.drawer{justify-self:start}
.drawer summary{
  position:relative;
  z-index:70;
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 16px;
  border-radius:999px;
  cursor:pointer;
  list-style:none;
  font-size:16px;
  color:var(--ink-2);
  background:var(--face);
  box-shadow:var(--raise-sm);
  transition:box-shadow .15s ease,transform .15s ease;
  user-select:none;
}

.drawer summary::-webkit-details-marker{display:none}
.drawer summary:active{transform:scale(.97);box-shadow:var(--sink)}
.drawer[open] summary{box-shadow:var(--sink)}

.bars{
  display:block;
  width:17px;
  height:2px;
  border-radius:3px;
  background:var(--ink);
  position:relative;
}

.bars::before,
.bars::after{
  content:'';
  position:absolute;
  left:0;
  width:17px;
  height:2px;
  border-radius:3px;
  background:var(--ink);
}

.bars::before{top:-6px}
.bars::after{top:6px}

.drawer > menu{
  position:fixed;
  inset:0;
  z-index:60;
  margin:0;
  padding:96px 22px 44px;
  list-style:none;
  display:grid;
  gap:12px;
  align-content:start;
  overflow-y:auto;
  background:linear-gradient(150deg,#e7eff8,#f8edf2);
  opacity:0;
  visibility:hidden;
  transform:translateY(-10px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s;
}

.drawer[open] > menu{
  opacity:1;
  visibility:visible;
  transform:none;
}

.drawer > menu li a{
  display:flex;
  align-items:center;
  min-height:48px;
  padding:12px 22px;
  border-radius:var(--r);
  text-decoration:none;
  font-size:19px;
  color:var(--ink);
  background:var(--face);
  box-shadow:var(--raise);
  transition:box-shadow .15s ease,transform .15s ease;
}

.drawer > menu li a:hover{box-shadow:var(--raise-sm)}
.drawer > menu li a:active{transform:scale(.985);box-shadow:var(--sink)}

/* 首屏 */
.hero{
  position:relative;
  max-width:1180px;
  margin:0 auto;
  min-height:100svh;
  padding:40px 18px 56px;
  display:grid;
  grid-template-columns:1.05fr .95fr;
  align-items:center;
  gap:28px;
}

.hero::before{
  content:'';
  position:absolute;
  inset:0;
  background-image:radial-gradient(rgba(23,31,38,.13) 1px,transparent 1px);
  background-size:22px 22px;
  opacity:.55;
  pointer-events:none;
}

.hero > *{position:relative;z-index:1}

.art{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:16px;
  align-items:center;
  min-height:360px;
}

.plate{
  display:block;
  overflow:hidden;
  aspect-ratio:3 / 4;
  border-radius:var(--r-lg);
  background:linear-gradient(145deg,#dceaf7,#f5e4ec);
  box-shadow:var(--raise);
}

.plate.p1{transform:rotate(-2deg)}
.plate.p2{transform:translateY(30px) rotate(2deg)}
.plate img{width:100%;height:100%;object-fit:cover;display:block}

.copy{
  justify-self:end;
  text-align:right;
  max-width:22ch;
}

.kicker{
  margin:0 0 10px;
  font-size:16px;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--ink-3);
}

h1{
  margin:0;
  font-size:clamp(30px,4.6vw,52px);
  line-height:1.24;
  font-weight:600;
  letter-spacing:-.01em;
}

/* 正文两栏：左栏目录 */
.wrap{
  max-width:1180px;
  margin:0 auto;
  padding:6px 18px 70px;
  display:grid;
  grid-template-columns:248px minmax(0,1fr);
  gap:32px;
  align-items:start;
}

.rail{
  position:sticky;
  top:86px;
  padding:22px 18px;
  border-radius:var(--r-lg);
  background:var(--face);
  box-shadow:var(--raise);
}

.rail h2{
  margin:0 0 14px;
  font-size:17px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--ink);
}

.rail ul{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  gap:6px;
}

.rail a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:8px 12px;
  border-radius:12px;
  text-decoration:none;
  font-size:16px;
  line-height:1.5;
  color:var(--ink-2);
  transition:box-shadow .15s ease,color .15s ease;
}

.rail a:hover{color:var(--ink);box-shadow:var(--sink)}

/* 标题装饰 */
.rail h2 > span,
.prose h2 > span,
.prose h3 > span{
  position:relative;
  display:inline-block;
}

.rail h2 > span::after,
.prose h2 > span::after,
.prose h3 > span::after{
  content:'';
  position:absolute;
  left:0;
  right:0;
  bottom:-5px;
  height:6px;
  border-radius:9px;
  background:linear-gradient(90deg,var(--blue),var(--pink));
}

.body{min-width:0}

.prose{
  max-width:44rem;
  font-size:17px;
  line-height:1.82;
}

.prose > section{
  background:#eef3fa;
  border-radius:var(--r-lg);
  box-shadow:var(--raise);
  padding:28px 24px;
  margin-bottom:26px;
  scroll-margin-top:96px;
  animation:rise .5s ease both;
}

.prose > section:nth-child(1){animation-delay:.02s}
.prose > section:nth-child(2){animation-delay:.06s}
.prose > section:nth-child(3){animation-delay:.1s}
.prose > section:nth-child(4){animation-delay:.14s}
.prose > section:nth-child(5){animation-delay:.18s}
.prose > section:nth-child(6){animation-delay:.22s}
.prose > section:nth-child(7){animation-delay:.26s}

@keyframes rise{
  from{opacity:0;transform:translateY(12px)}
  to{opacity:1;transform:none}
}

.prose h2{
  margin:1.9em 0 .75em;
  font-size:clamp(21px,2.6vw,28px);
  line-height:1.34;
  font-weight:600;
}

.prose h3{
  margin:1.6em 0 .6em;
  font-size:19px;
  line-height:1.4;
  font-weight:600;
}

.prose > section > h2:first-child{margin-top:0}

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

.prose a{
  color:#1b4f70;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}

.prose ul,.prose ol{padding-left:1.25em;margin:0 0 1.1em}
.prose li{margin-bottom:.4em}

.prose blockquote{
  margin:1.4em 0;
  padding:16px 20px;
  border-radius:var(--r);
  background:#e9f0f9;
  box-shadow:var(--sink);
}

.prose blockquote p:last-child{margin-bottom:0}

.prose img{border-radius:var(--r);display:block;margin:1.2em 0;height:auto}

.prose code{
  font-size:16px;
  padding:1px 6px;
  border-radius:8px;
  background:#e4ecf6;
}

.prose table{width:100%;border-collapse:collapse;font-size:16px}
.prose th,.prose td{padding:8px 10px;text-align:left}

/* 页脚：四栏 + 底部两侧 */
.foot{
  max-width:1180px;
  margin:0 auto;
  padding:26px 18px 60px;
  display:grid;
  grid-template-columns:1fr auto;
  gap:16px;
  align-items:center;
}

.foot .cols{
  grid-column:1 / -1;
  margin:0;
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:12px;
}

.foot .cols span{display:block}

.foot .cols a{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:10px 12px;
  border-radius:var(--r);
  text-align:center;
  font-size:16px;
  text-decoration:none;
  color:var(--ink-2);
  background:var(--face);
  box-shadow:var(--raise-sm);
  transition:box-shadow .15s ease,color .15s ease,transform .15s ease;
}

.foot .cols a:hover{color:var(--ink);box-shadow:var(--raise)}
.foot .cols a:active{transform:scale(.97);box-shadow:var(--sink)}

.foot .note{
  font-size:16px;
  color:var(--ink-3);
  letter-spacing:.02em;
}

.foot .totop a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  border-radius:999px;
  font-size:16px;
  text-decoration:none;
  color:var(--ink-2);
  background:var(--face);
  box-shadow:var(--raise-sm);
}

.foot .totop a:active{box-shadow:var(--sink)}

@media (max-width:900px){
  .wrap{grid-template-columns:1fr;gap:22px;padding-bottom:52px}
  .rail{position:static;padding:18px}
  .rail ul{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .rail a{font-size:16px}
  .hero{grid-template-columns:1fr;gap:22px;padding-top:20px;align-items:start;min-height:0}
  .copy{order:-1;justify-self:start;text-align:left;max-width:26ch}
  .art{min-height:250px;gap:12px}
  .plate.p2{transform:translateY(16px) rotate(2deg)}
  .prose > section{padding:22px 18px}
}

@media (max-width:600px){
  .bar{grid-template-columns:auto 1fr auto;padding:8px 14px;gap:8px}
  .brand{font-size:17px}
  .contact{padding:0 14px;font-size:16px}
  .drawer summary .lbl{display:none}
  .drawer summary{padding:0 14px}
  h1{font-size:clamp(27px,8.4vw,38px)}
  .foot .cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot{padding-bottom:44px}
}

@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}