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

:root{
  --ink:#172623;
  --teal:#5cc6b0;
  --sand:#d4c4a8;
  --sand-lt:#e9dfcb;
  --paper:#f7f2e9;
  --clay:#c07a5b;
  --olive:#6b7b3c;
  --body:#28322d;
  --muted:#5d6b62;
  --line:rgba(23,38,35,.14);
  --serif:"Noto Serif JP","Songti SC",Georgia,"Times New Roman",serif;
  --sans:"Noto Sans JP","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --r:18px;
}

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

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

body{
  margin:0;
  font-family:var(--sans);
  font-size:1.0625rem;
  line-height:1.85;
  color:var(--body);
  background:var(--paper);
  padding-bottom:calc(88px + env(safe-area-inset-bottom));
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:radial-gradient(rgba(23,38,35,.06) 1px,transparent 1px);
  background-size:3px 3px;
  opacity:.85;
}

main,footer{position:relative;z-index:1}

/* 底部固定条 */
.dock{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:50;
  display:flex;
  align-items:center;
  gap:.4rem;
  padding:.5rem .7rem calc(.5rem + env(safe-area-inset-bottom));
  background:rgba(247,242,233,.95);
  backdrop-filter:blur(10px);
  border-top:1px solid var(--line);
  box-shadow:0 -10px 26px -18px rgba(23,38,35,.5);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  flex:0 0 auto;
  min-height:44px;
  padding:.2rem .35rem;
  font-family:var(--serif);
  font-size:1.02rem;
  font-weight:600;
  letter-spacing:.03em;
  color:var(--ink);
  text-decoration:none;
  white-space:nowrap;
}

.brand-mark{
  width:11px;
  height:11px;
  border-radius:52% 40% 56% 44%;
  background:var(--teal);
  box-shadow:0 0 0 3px rgba(92,198,176,.26);
}

.dock-nav{
  flex:1 1 auto;
  min-width:0;
  overflow-x:auto;
  overflow-y:hidden;
  scrollbar-width:none;
}
.dock-nav::-webkit-scrollbar{display:none}

.dock-nav p{
  display:flex;
  gap:.1rem;
  margin:0;
  padding:0;
  white-space:nowrap;
}

.dock-nav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.35rem .55rem;
  font-size:1rem;
  color:var(--ink);
  text-decoration:none;
  border-radius:12px;
  border-bottom:2px solid transparent;
  transition:background .25s ease-out;
}
.dock-nav a:hover{background:rgba(92,198,176,.16)}
.dock-nav a:focus-visible{outline:2px solid var(--teal);outline-offset:2px}

.burger{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  flex:0 0 auto;
  min-height:44px;
  padding:.4rem .65rem;
  font-family:var(--sans);
  font-size:1rem;
  color:var(--ink);
  background:transparent;
  border:1px solid var(--ink);
  border-radius:14px;
  cursor:pointer;
  transition:background .25s ease-out,color .25s ease-out;
}
.burger-bar{
  width:17px;
  height:2px;
  background:var(--ink);
  box-shadow:0 -6px 0 var(--ink),0 6px 0 var(--ink);
  transition:background .25s ease-out;
}
.dock.open .burger{background:var(--ink);color:var(--sand-lt)}
.dock.open .burger-bar{background:var(--sand-lt);box-shadow:0 -6px 0 var(--sand-lt),0 6px 0 var(--sand-lt)}

/* 全屏遮罩菜单 */
.overlay{
  position:fixed;
  inset:0;
  z-index:-1;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:.9rem;
  padding:4rem 1.4rem 5.5rem;
  overflow-y:auto;
  background:linear-gradient(158deg,#172623,#22332c 62%,#1b2a24);
  color:var(--sand-lt);
  opacity:0;
  visibility:hidden;
  transition:opacity .35s ease-out,visibility .35s ease-out;
}
.dock.open .overlay{opacity:1;visibility:visible}

.overlay-h{
  margin:0;
  font-family:var(--sans);
  font-size:1rem;
  font-weight:500;
  letter-spacing:.32em;
  color:var(--teal);
}
.overlay-h span{
  display:inline-block;
  padding-bottom:.35rem;
  border-bottom:1px solid rgba(92,198,176,.45);
}

.overlay-links{
  display:flex;
  flex-direction:column;
  margin:0;
}
.overlay-links a{
  display:block;
  min-height:48px;
  padding:.5rem 0;
  font-family:var(--serif);
  font-size:clamp(1.25rem,5.4vw,1.85rem);
  line-height:1.5;
  color:var(--sand-lt);
  text-decoration:none;
  border-bottom:1px solid rgba(212,196,168,.18);
}
.overlay-links a:hover{color:var(--teal)}

.overlay-contact{margin:.6rem 0 0}
.overlay-contact a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:.4rem 1.2rem;
  font-size:1rem;
  color:var(--teal);
  text-decoration:none;
  border:1px solid rgba(92,198,176,.75);
  border-radius:999px;
}

/* 首屏 */
main{padding-top:1rem}

.hero{
  display:flex;
  flex-direction:column;
  justify-content:flex-start;
  min-height:45vh;
  max-width:1040px;
  margin:0 auto;
  padding:0 1rem;
  text-align:center;
}

.hero-copy{padding:clamp(.6rem,4vh,2rem) 0 0}

h1{
  max-width:22ch;
  margin:0 auto;
  font-family:var(--serif);
  font-size:clamp(1.8rem,5.8vw,2.9rem);
  font-weight:600;
  line-height:1.32;
  letter-spacing:.01em;
  color:var(--ink);
}

.hero-sub{
  max-width:38ch;
  margin:1rem auto 0;
  font-size:1rem;
  line-height:1.8;
  color:var(--muted);
}

.hero-fig{
  position:relative;
  width:100%;
  max-width:820px;
  max-height:42vh;
  aspect-ratio:16/9;
  margin:1.6rem auto 0;
  overflow:hidden;
  border-radius:var(--r);
  border-bottom:3px solid var(--teal);
  background:linear-gradient(150deg,var(--sand-lt),var(--sand));
  box-shadow:0 20px 38px -24px rgba(23,38,35,.6);
  animation:hero-in .9s ease-out both;
}

.hero-img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  animation:drift 14s ease-out both;
}

/* 正文区 */
.grid{
  display:grid;
  grid-template-columns:240px minmax(0,1fr);
  gap:1.4rem 2.2rem;
  align-items:start;
  max-width:1060px;
  margin:2.6rem auto 0;
  padding:0 1rem;
}

.rail{
  position:sticky;
  top:1.2rem;
  padding:.2rem 0 .2rem 1rem;
  border-left:3px solid var(--teal);
}

.rail-h{
  margin:0 0 .6rem;
  font-family:var(--sans);
  font-size:1rem;
  font-weight:500;
  letter-spacing:.18em;
  color:var(--muted);
}
.rail-h span{
  display:inline-block;
  padding-bottom:.3rem;
  border-bottom:1px solid var(--line);
}

.rail-list{
  list-style:none;
  margin:0;
  padding:0;
}
.rail-list li + li{margin-top:.1rem}
.rail-list a{
  display:flex;
  align-items:baseline;
  gap:.5rem;
  min-height:40px;
  padding:.3rem 0;
  font-size:1rem;
  line-height:1.5;
  color:var(--ink);
  text-decoration:none;
}
.rail-list a:hover{color:#2f8d7c}
.rail-list b{
  font-weight:500;
  font-size:.95rem;
  color:var(--clay);
}

.prose{min-width:0}
.prose > div{
  padding:2.2rem 0;
  scroll-margin-top:1.4rem;
  scroll-margin-bottom:6rem;
  animation:rise .7s ease-out both;
}
.prose > div + div{border-top:1px solid var(--line)}
.prose > div:nth-of-type(1){animation-delay:.04s}
.prose > div:nth-of-type(2){animation-delay:.09s}
.prose > div:nth-of-type(3){animation-delay:.14s}
.prose > div:nth-of-type(4){animation-delay:.19s}
.prose > div:nth-of-type(5){animation-delay:.24s}
.prose > div:nth-of-type(6){animation-delay:.29s}
.prose > div:nth-of-type(7){animation-delay:.34s}

.prose h2{
  margin:0 0 1rem;
  font-family:var(--serif);
  font-size:clamp(1.35rem,3.4vw,1.8rem);
  font-weight:600;
  line-height:1.45;
  color:var(--ink);
}
.prose h2 > span{
  position:relative;
  display:inline-block;
  padding-bottom:.45rem;
}
.prose h2 > span::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:2.6rem;
  height:3px;
  border-radius:3px;
  background:var(--teal);
}

.prose h3{
  margin:1.6rem 0 .55rem;
  font-family:var(--serif);
  font-size:1.2rem;
  font-weight:600;
  line-height:1.55;
  color:var(--clay);
}
.prose h3 > span{
  display:inline-block;
  padding-left:.6rem;
  border-left:4px solid var(--sand);
}

.prose p{margin:0 0 1rem}
.prose ul,.prose ol{margin:0 0 1.1rem;padding-left:1.3rem}
.prose li{margin:.3rem 0}
.prose a{color:#2f8d7c;text-decoration:underline;text-underline-offset:3px}
.prose strong{color:var(--ink)}

.prose figure{
  margin:1.4rem 0;
  overflow:hidden;
  border-radius:var(--r);
  border-bottom:3px solid var(--sand);
}
.prose figure img{display:block;width:100%;height:auto}
.prose figcaption{
  padding:.6rem .9rem;
  font-size:1rem;
  color:var(--muted);
  background:rgba(212,196,168,.26);
}

.prose blockquote{
  margin:1.4rem 0;
  padding:.9rem 1.1rem;
  font-size:1rem;
  color:#3d3a32;
  background:rgba(212,196,168,.28);
  border-left:3px solid var(--clay);
  border-radius:0 var(--r) var(--r) 0;
}

.prose table{
  width:100%;
  margin:1.2rem 0;
  border-collapse:collapse;
  font-size:1rem;
}
.prose th,.prose td{
  padding:.6rem .5rem;
  text-align:left;
  border-bottom:1px solid var(--line);
}
.prose th{color:var(--ink)}

/* 页脚 */
.foot{
  max-width:760px;
  margin:0 auto;
  padding:3rem 1rem 2.4rem;
  text-align:center;
}

.foot-cta{margin:0 0 1.3rem}
.foot-cta a{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:52px;
  padding:.85rem 2.2rem;
  font-family:var(--serif);
  font-size:1.05rem;
  letter-spacing:.08em;
  color:var(--sand-lt);
  text-decoration:none;
  background:var(--ink);
  border-radius:var(--r);
  border-bottom:3px solid var(--teal);
  transition:transform .3s ease-out,background .3s ease-out;
}
.foot-cta a:hover{transform:translateY(-2px);background:#22332c}

.foot small{
  display:block;
  font-size:1rem;
  letter-spacing:.04em;
  color:var(--muted);
}

@keyframes rise{
  from{opacity:0;transform:translateY(14px)}
  to{opacity:1;transform:none}
}
@keyframes hero-in{
  from{opacity:0;transform:translateY(18px)}
  to{opacity:1;transform:none}
}
@keyframes drift{
  from{transform:scale(1.06)}
  to{transform:scale(1)}
}

@media (max-width:820px){
  .grid{
    grid-template-columns:minmax(0,1fr);
    gap:1rem;
    margin-top:1.8rem;
  }
  .rail{
    position:static;
    padding:.9rem 0 0;
    border-left:0;
    border-top:1px solid var(--line);
  }
  .rail-h{letter-spacing:.14em}
  .rail-list{display:flex;flex-wrap:wrap;gap:.4rem}
  .rail-list li + li{margin-top:0}
  .rail-list a{
    min-height:40px;
    padding:.35rem .7rem;
    border:1px solid var(--line);
    border-radius:999px;
  }
  .foot{padding-bottom:2rem}
}

@media (max-width:480px){
  .burger-txt{display:none}
  .brand{font-size:1rem}
  .hero-fig{max-height:36vh}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .hero-fig,.hero-img,.prose > div{animation:none}
  .foot-cta a{transition:none}
}

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