:root{
  --mint:#5cc6b0;
  --mint-deep:#3f9e8c;
  --sand:#d4c4a8;
  --ink:#172623;
  --ink-soft:#33443f;
  --clay:#c67b5c;
  --paper:#f3ece0;
  --card:#faf5ea;
  --line:rgba(23,38,35,.14);
  --radius:10px;
}

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

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Inter','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  font-size:17px;
  line-height:1.7;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:6;
  pointer-events:none;
  opacity:.32;
  mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.45'/%3E%3C/svg%3E");
}

img{max-width:100%;display:block}

a{color:var(--mint-deep)}

:focus-visible{
  outline:2px solid var(--mint-deep);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- 页头 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:20;
  background:rgba(243,236,224,.94);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line);
}

.brandline{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:10px clamp(16px,4vw,40px) 4px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  color:var(--ink);
  text-decoration:none;
  font-weight:700;
  font-size:1.15rem;
  letter-spacing:-.025em;
}

.mark{
  width:14px;
  height:14px;
  flex:none;
  border-radius:4px 9px 4px 9px;
  background:linear-gradient(140deg,var(--mint),var(--clay));
  transition:transform .45s cubic-bezier(.2,.7,.3,1);
}

.brand:hover .mark{transform:rotate(45deg) scale(1.15)}

.logo{
  width:32px;
  height:32px;
  flex:none;
  border-radius:50%;
  object-fit:cover;
}

.brandname{
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 18px;
  border-radius:999px;
  background:var(--mint);
  color:#0e1f1b;
  font-size:1rem;
  font-weight:600;
  text-decoration:none;
  white-space:nowrap;
  box-shadow:0 10px 20px -14px rgba(23,38,35,.9);
  transition:transform .3s cubic-bezier(.2,.7,.3,1),box-shadow .3s,background .3s;
}

.cta:hover{
  background:#6ed3be;
  transform:translateY(-3px);
  box-shadow:0 16px 24px -14px rgba(23,38,35,.85);
}

.cta:active{transform:translateY(0)}

.menuline{padding:0 clamp(10px,3vw,32px) 8px}

.menuline p{
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  margin:0;
}

.menuline a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:8px 12px;
  border-radius:8px;
  color:var(--ink-soft);
  font-size:1rem;
  text-decoration:none;
  transition:background .25s ease-out,color .25s ease-out;
}

.menuline a:hover{background:rgba(92,198,176,.26);color:var(--ink)}

.ico{
  width:7px;
  height:7px;
  flex:none;
  border-radius:2px;
  background:var(--mint-deep);
  transform:rotate(45deg);
  transition:transform .35s cubic-bezier(.2,.7,.3,1),background .35s;
}

.menuline a:hover .ico{transform:rotate(0) scale(1.25);background:var(--clay)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  display:flex;
  align-items:flex-end;
  justify-content:flex-end;
  min-height:70vh;
  padding-top:64px;
  overflow:hidden;
  background:linear-gradient(150deg,#172623,#254a40 58%,#376b5b);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 72px),0 100%);
}

.hero-media{position:absolute;inset:0;z-index:0}

.hero-media .hero-img{
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.46;
}

.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(92deg,rgba(23,38,35,.12),rgba(23,38,35,.82));
}

.hero-body{
  position:relative;
  z-index:2;
  width:100%;
  max-width:900px;
  margin-left:auto;
  padding:0 clamp(20px,5vw,56px) 92px;
  text-align:right;
}

.hero-body h1{
  margin:0;
  color:#f7f2e6;
  font-size:clamp(2rem,7vw,4.4rem);
  line-height:1.05;
  font-weight:700;
  letter-spacing:-.035em;
  text-wrap:balance;
}

.hero-body p{
  margin:16px 0 0;
  margin-left:auto;
  max-width:42ch;
  color:rgba(247,242,230,.86);
  font-size:1.05rem;
  line-height:1.6;
}

/* ---------- 版心 ---------- */
.wrap{
  max-width:1140px;
  margin:0 auto;
  padding:0 clamp(16px,4vw,40px);
}

.body-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr) 270px;
  gap:34px;
  padding:56px 0 8px;
  align-items:start;
}

/* ---------- 正文 ---------- */
.prose{min-width:0}

.prose > section{
  background:var(--card);
  border-radius:var(--radius);
  padding:clamp(20px,3vw,34px);
  margin:0 0 20px;
  scroll-margin-top:130px;
  box-shadow:0 16px 34px -26px rgba(23,38,35,.95);
}

.prose h2{
  margin:0 0 10px;
  font-size:clamp(1.35rem,2.4vw,1.85rem);
  line-height:1.25;
  font-weight:650;
  letter-spacing:-.02em;
}

.prose h3{
  margin:26px 0 8px;
  font-size:1.2rem;
  line-height:1.35;
  font-weight:600;
  color:#24413a;
}

.prose p{margin:0 0 14px;line-height:1.78}

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

.prose a{color:var(--mint-deep);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}

.prose a:hover{color:var(--clay)}

.prose hr{
  border:0;
  height:2px;
  margin:10px 0 20px;
  background:linear-gradient(90deg,var(--mint),rgba(92,198,176,0));
  border-radius:2px;
}

.prose ul,.prose ol{margin:0 0 16px;padding-left:1.15em}

.prose li{margin:0 0 8px;line-height:1.72}

.prose li::marker{color:var(--mint-deep)}

.prose blockquote{
  margin:18px 0;
  padding:12px 16px;
  border-radius:6px 14px 14px 6px;
  background:rgba(212,196,168,.42);
  color:#2b3d37;
}

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

.prose figure{margin:18px 0}

.prose figure img{border-radius:8px}

.prose figcaption{
  margin-top:8px;
  font-size:1rem;
  color:#5c6b64;
}

.prose time{
  font-variant-numeric:tabular-nums;
  color:#5c6b64;
}

.prose table{width:100%;border-collapse:collapse;margin:16px 0;font-size:1rem}

.prose th,.prose td{padding:9px 10px;text-align:left;border-bottom:1px solid var(--line)}

.prose th{background:rgba(212,196,168,.35);font-weight:600}

/* ---------- 侧栏 ---------- */
.rail{
  position:sticky;
  top:132px;
  padding:18px 16px;
  background:var(--ink);
  color:#ded7c6;
  border-radius:2px 14px 14px 14px;
  box-shadow:0 20px 34px -28px rgba(23,38,35,1);
}

.rail h2{
  margin:0 0 8px;
  font-size:1rem;
  font-weight:600;
  letter-spacing:.12em;
  color:var(--mint);
}

.rail hr{
  border:0;
  height:1px;
  margin:0 0 10px;
  background:rgba(212,196,168,.34);
}

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

.rail li:last-child a{border-bottom:0}

.rail a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:4px 2px;
  color:#e2dbca;
  font-size:1rem;
  text-decoration:none;
  border-bottom:1px dashed rgba(212,196,168,.2);
  transition:color .22s ease-out,padding-left .22s ease-out;
}

.rail a:hover{color:var(--mint);padding-left:8px}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:64px;
  padding:clamp(34px,6vw,64px) 20px 28px;
  background:var(--ink);
  color:#e7dfcd;
  text-align:center;
  overflow:hidden;
}

.foot p{
  margin:0;
  font-size:clamp(2rem,10.5vw,5.4rem);
  line-height:1;
  font-weight:700;
  letter-spacing:-.05em;
  color:#f4eee1;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.foot small{
  display:block;
  margin-top:18px;
  font-size:1rem;
  line-height:1.5;
  color:rgba(212,196,168,.78);
}

/* ---------- 动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .75s cubic-bezier(.2,.7,.3,1),transform .75s cubic-bezier(.2,.7,.3,1);
  will-change:opacity,transform;
}

.reveal.in{opacity:1;transform:none}

.hero-body.reveal{transition-delay:.08s}

/* ---------- 断点 ---------- */
@media (max-width:900px){
  .body-grid{
    grid-template-columns:minmax(0,1fr);
    gap:26px;
    padding-top:36px;
  }

  .rail{position:static;margin-bottom:24px;border-radius:14px}

  .rail ul{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 12px}

  .hero{min-height:64vh}

  .hero-body{padding-bottom:84px}
}

@media (max-width:560px){
  body{font-size:16px}

  .hero{min-height:60vh;padding-top:40px;clip-path:polygon(0 0,100% 0,100% calc(100% - 44px),0 100%)}

  .hero-body{padding-bottom:64px}

  .hero-body p{font-size:1rem}

  .prose > section{padding:18px 16px;border-radius:10px}

  .foot{margin-top:44px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}

  .reveal,.hero-body.reveal{
    opacity:1;
    transform:none;
    transition:none;
  }

  .cta,.ico,.mark,.rail a,.menuline a{transition:none}
}

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