:root{
  --ink:#171f26;
  --ink-soft:#41505c;
  --blue:#c8e0f4;
  --pink:#f5e0e8;
  --bg:#e8eef5;
  --face-a:#f4f8fc;
  --face-b:#dfe8f1;
  --r:28px;
  --out:-6px -6px 16px rgba(255,255,255,.92), 7px 7px 20px rgba(23,31,38,.17);
  --out-sm:-3px -3px 8px rgba(255,255,255,.95), 4px 4px 10px rgba(23,31,38,.15);
  --in:inset -4px -4px 10px rgba(255,255,255,.95), inset 5px 5px 12px rgba(23,31,38,.14);
  --sans:'Raleway',system-ui,-apple-system,'Segoe UI','Noto Sans SC','PingFang SC',sans-serif;
  --serif:'Lora',Georgia,'Songti SC','Noto Serif SC',serif;
}

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

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

body{
  margin:0;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.7;
  color:var(--ink);
  background:
    radial-gradient(1100px 620px at 8% -8%, #f7e6ee 0%, rgba(247,230,238,0) 62%),
    radial-gradient(980px 700px at 96% 2%, #cfe3f6 0%, rgba(207,227,246,0) 58%),
    var(--bg);
  background-attachment:fixed;
  padding-bottom:96px;
  overflow-x:hidden;
}

body.menu-open{overflow:hidden}

img{max-width:100%}
a{color:var(--ink);text-decoration:none}

:where(main,#main,.prose article,.prose h2,.prose h3){scroll-margin-top:96px}

.skip{
  position:absolute;
  left:14px;top:-60px;
  z-index:120;
  padding:12px 18px;
  border-radius:16px;
  background:var(--face-a);
  box-shadow:var(--out-sm);
  transition:top .18s ease;
}
.skip:focus{top:14px}

/* ---------- 角落：品牌 + 菜单 ---------- */
.corner{
  position:fixed;
  top:14px;left:14px;right:14px;
  z-index:90;
  display:flex;
  align-items:center;
  justify-content:space-between;
  pointer-events:none;
}
.corner>*{pointer-events:auto}

.mark,.burger{
  width:48px;height:48px;
  display:grid;
  place-items:center;
  border-radius:16px;
  border:0;
  background:linear-gradient(145deg,var(--face-a),var(--face-b));
  box-shadow:var(--out-sm);
  color:var(--ink);
  font-family:var(--serif);
  font-size:20px;
  font-weight:700;
  transition:transform .15s ease, box-shadow .15s ease;
}
.mark img{width:34px;height:34px;object-fit:contain;display:block}
.mark:active,.burger:active{transform:scale(.94);box-shadow:var(--in)}

.burger span{
  display:block;
  width:20px;height:2px;
  margin:2.5px 0;
  border-radius:2px;
  background:var(--ink);
  transition:transform .2s ease, opacity .2s ease;
}
body.menu-open .burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
body.menu-open .burger span:nth-child(2){opacity:0}
body.menu-open .burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 主区 ---------- */
main{display:block}

.hero{
  position:relative;
  isolation:isolate;
  display:grid;
  place-items:center;
  text-align:center;
  min-height:clamp(350px,45vh,440px);
  padding:104px 22px 76px;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background-image:radial-gradient(rgba(23,31,38,.22) 1px, rgba(23,31,38,0) 1px);
  background-size:24px 24px;
  opacity:.5;
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  background:linear-gradient(180deg, rgba(238,243,249,.8), rgba(238,243,249,.94));
  pointer-events:none;
}

.hero-art{
  position:absolute;
  inset:0;
  z-index:0;
  margin:0;
  overflow:hidden;
  background:linear-gradient(145deg,#d9e7f6,#f7e7ee);
  border-radius:0 0 50% 50% / 0 0 92px 92px;
  box-shadow:inset 0 -18px 34px rgba(23,31,38,.14);
}
.hero-art img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  opacity:.82;
}

.hero-txt{
  position:relative;
  z-index:3;
  max-width:760px;
}

h1{
  margin:0;
  font-family:var(--serif);
  font-size:clamp(1.7rem,6vw,2.9rem);
  font-weight:600;
  line-height:1.28;
  letter-spacing:.01em;
  color:var(--ink);
  text-shadow:0 1px 0 rgba(255,255,255,.85), 0 -1px 0 rgba(23,31,38,.08);
}

.lede{
  margin:16px auto 0;
  max-width:44ch;
  font-size:16.5px;
  line-height:1.65;
  color:var(--ink-soft);
}

/* ---------- 正文两栏 ---------- */
.stage{
  max-width:1120px;
  margin:0 auto;
  padding:34px 20px 0;
  display:grid;
  grid-template-columns:248px minmax(0,1fr);
  gap:30px;
  align-items:start;
}

.side{
  position:sticky;
  top:96px;
  padding:20px 18px 22px;
  border-radius:var(--r);
  background:linear-gradient(145deg,var(--face-a),var(--face-b));
  box-shadow:var(--out);
}
.side::after{
  content:"";
  display:block;
  height:4px;
  margin-top:16px;
  border-radius:3px;
  background:linear-gradient(90deg,var(--blue),var(--pink));
}
.side h2{
  margin:0 0 12px;
  font-family:var(--serif);
  font-size:17px;
  font-weight:600;
  letter-spacing:.04em;
}
.sideline{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:8px;
}
.sideline a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:6px 14px;
  border-radius:16px;
  font-size:16px;
  color:var(--ink-soft);
  background:linear-gradient(145deg,rgba(255,255,255,.72),rgba(214,225,237,.48));
  box-shadow:var(--out-sm);
  transition:transform .15s ease, color .15s ease, box-shadow .15s ease;
}
.sideline a:hover{color:var(--ink);transform:translateX(3px)}
.sideline a:active{transform:scale(.97);box-shadow:var(--in)}

/* ---------- 正文卡片 ---------- */
.prose{min-width:0}
.prose>article{
  position:relative;
  overflow:hidden;
  margin:0 0 26px;
  padding:28px 26px 32px;
  border-radius:var(--r);
  background:linear-gradient(145deg,var(--face-a),var(--face-b));
  box-shadow:var(--out);
  transition:transform .2s ease, box-shadow .2s ease;
}
.prose>article:hover{transform:translateY(-3px)}
.prose>article::after{
  content:"";
  position:absolute;
  left:26px;right:26px;bottom:14px;
  height:5px;
  border-radius:3px;
  background:linear-gradient(90deg,var(--blue),var(--pink));
  opacity:.9;
}
.prose>article:last-child{margin-bottom:0}

.prose :is(h2,h3){
  font-family:var(--serif);
  font-weight:600;
  line-height:1.35;
  color:var(--ink);
}
.prose h2{margin:0 0 16px;font-size:clamp(1.24rem,3.4vw,1.6rem)}
.prose h3{margin:24px 0 10px;font-size:19px}
.prose :is(h2,h3)>span{
  display:inline-block;
  padding-bottom:6px;
  border-bottom:2px solid rgba(200,224,244,.95);
}

.prose p{margin:0 0 16px;font-size:17px;line-height:1.78;color:#26313a}
.prose p:last-child{margin-bottom:0}
.prose ul,.prose ol{margin:0 0 16px;padding-left:1.35em}
.prose li{margin:6px 0;line-height:1.72}
.prose a{
  color:#1d3d55;
  text-decoration:underline;
  text-decoration-color:rgba(200,224,244,.95);
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
.prose strong{color:var(--ink)}
.prose blockquote{
  margin:0 0 16px;
  padding:14px 18px;
  border-radius:16px;
  background:rgba(255,255,255,.62);
  box-shadow:var(--in);
  color:var(--ink-soft);
}
.prose figure{margin:18px 0}
.prose img{border-radius:16px;box-shadow:var(--out-sm);height:auto}

/* ---------- 页脚 ---------- */
.foot{
  max-width:1120px;
  margin:60px auto 0;
  padding:0 20px 26px;
}
.cta{
  padding:34px 24px 30px;
  text-align:center;
  border-radius:var(--r);
  background:linear-gradient(145deg,#dcebf9,var(--blue));
  box-shadow:var(--out);
}
.cta h2{
  margin:0 0 18px;
  font-family:var(--serif);
  font-size:clamp(1.25rem,4vw,1.75rem);
  font-weight:600;
}
.cta-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:10px 26px;
  border-radius:18px;
  font-size:16px;
  font-weight:600;
  background:linear-gradient(145deg,#f7fafd,#dbe6f1);
  box-shadow:var(--out-sm);
  transition:transform .15s ease, box-shadow .15s ease;
}
.cta-btn:active{transform:scale(.96);box-shadow:var(--in)}

.fgrid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:24px;
  margin-top:34px;
}
.fbrand{display:flex;align-items:center;gap:10px}
.fbrand .fmark{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:14px;background:linear-gradient(145deg,var(--face-a),var(--face-b));box-shadow:var(--out-sm);font-family:var(--serif);font-size:17px;font-weight:700}
.fbrand img{width:26px;height:26px;object-fit:contain}
.fbrand b{font-family:var(--serif);font-size:16px;font-weight:600}

.fgrid dl{margin:0}
.fgrid dt{
  font-size:14px;
  letter-spacing:.12em;
  color:var(--ink-soft);
  margin-bottom:8px;
}
.fgrid dd{margin:0;font-size:16px;color:var(--ink)}
.fgrid dd ul{list-style:none;margin:0;padding:0}
.fgrid dd a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:16px;
  color:var(--ink-soft);
  transition:color .15s ease, transform .15s ease;
}
.fgrid dd a:hover{color:var(--ink);transform:translateX(2px)}

.copy{
  margin:30px 0 0;
  text-align:center;
  font-size:15px;
  color:var(--ink-soft);
}

/* ---------- 底部固定导航 ---------- */
.dock{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:70;
  padding:8px 10px calc(8px + env(safe-area-inset-bottom,0px));
  background:linear-gradient(180deg,#f2f6fa,#e0e9f2);
  box-shadow:0 -8px 22px rgba(23,31,38,.14);
  border-radius:22px 22px 0 0;
  transition:border-radius .2s ease;
}
.dock ol{
  display:flex;
  gap:8px;
  margin:0;
  padding:2px;
  list-style:none;
  overflow-x:auto;
  scrollbar-width:none;
  overscroll-behavior-x:contain;
}
.dock ol::-webkit-scrollbar{display:none}
.dock a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:6px 14px;
  border-radius:16px;
  font-size:16px;
  white-space:nowrap;
  color:var(--ink-soft);
  transition:color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.dock a:hover{color:var(--ink)}
.dock a:active{transform:scale(.96);box-shadow:var(--in);color:var(--ink)}

body.menu-open .dock{
  top:0;
  border-radius:0;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow-y:auto;
  padding:86px 22px 34px;
}
body.menu-open .dock ol{
  flex-direction:column;
  overflow:visible;
  gap:14px;
  width:100%;
  max-width:420px;
  padding:0;
}
body.menu-open .dock a{
  justify-content:center;
  min-height:56px;
  font-size:19px;
  color:var(--ink);
  background:linear-gradient(145deg,var(--face-a),var(--face-b));
  box-shadow:var(--out-sm);
}

/* ---------- 焦点与动效 ---------- */
:focus-visible{outline:3px solid rgba(23,31,38,.5);outline-offset:3px}

@media (prefers-reduced-motion: no-preference){
  .prose>article{
    animation:rise .55s cubic-bezier(.2,.7,.3,1) both;
  }
  .prose>article:nth-child(2){animation-delay:.06s}
  .prose>article:nth-child(3){animation-delay:.12s}
  .prose>article:nth-child(4){animation-delay:.18s}
  .prose>article:nth-child(5){animation-delay:.24s}
  .prose>article:nth-child(6){animation-delay:.3s}
  .prose>article:nth-child(7){animation-delay:.36s}
  .prose>article:nth-child(n+8){animation-delay:.4s}
  .side{animation:rise .5s cubic-bezier(.2,.7,.3,1) both}
  .hero-txt{animation:fade .7s ease both}
}

@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@keyframes fade{from{opacity:0}to{opacity:1}}

/* ---------- 断点 ---------- */
@media (max-width:900px){
  .stage{grid-template-columns:minmax(0,1fr);gap:22px;padding-top:26px}
  .side{position:static;order:0}
  .sideline{flex-direction:row;flex-wrap:wrap}
  .sideline li{flex:1 1 45%}
  .sideline a{justify-content:center}
  .fgrid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
  .fbrand{grid-column:1 / -1}
}

@media (max-width:560px){
  body{font-size:16px;padding-bottom:92px}
  .hero{min-height:clamp(330px,44vh,400px);padding:96px 18px 66px}
  .hero-art{border-radius:0 0 50% 50% / 0 0 66px 66px}
  .prose>article{padding:22px 20px 28px;border-radius:24px;margin-bottom:20px}
  .prose>article::after{left:20px;right:20px;bottom:12px;height:4px}
  .cta{padding:28px 18px 26px}
  .fgrid{grid-template-columns:minmax(0,1fr);gap:18px}
  .fgrid dd a{min-height:44px}
  .copy{font-size:16px}
}

@media (min-width:1024px){
  .dock{left:50%;transform:translateX(-50%);right:auto;bottom:18px;border-radius:22px;max-width:min(1040px,calc(100% - 40px));padding:8px 10px;box-shadow:0 -4px 20px rgba(23,31,38,.16)}
  .dock ol{justify-content:center;overflow:visible;flex-wrap:wrap}
  body.menu-open .dock{left:0;right:0;top:0;bottom:0;transform:none;border-radius:0;max-width:none;box-shadow:none}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

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