:root {
  --bg: #FBF3DC;
  --bg-alt: #F3E7C8;
  --ink: #26301F;
  --ink-soft: #5C6650;
  --frog: #4E7B3C;
  --frog-deep: #33542A;
  --milk: #F5D547;
  --card: #FFFDF4;
  --line: #E2D5AE;
  --shadow: 0 10px 30px rgba(80, 70, 20, 0.12);
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(245, 213, 71, 0.35), transparent 34%),
    radial-gradient(circle at 88% 90%, rgba(78, 123, 60, 0.18), transparent 40%),
    var(--bg);
  color: var(--ink);
  font-family: system-ui, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.7;
  -webkit-tap-highlight-color: transparent;
}

a { color: var(--frog-deep); }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--frog);
  outline-offset: 2px;
  border-radius: 6px;
}
button, .button { touch-action: manipulation; }

section { scroll-margin-top: 84px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px clamp(16px, 4vw, 48px);
  background: rgba(251, 243, 220, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  text-decoration: none;
}
.brand img { display: block; }
.brand em { font-style: normal; font-size: 12px; color: var(--ink-soft); margin-left: 6px; letter-spacing: 0.08em; }
.site-header nav { display: flex; align-items: center; gap: clamp(10px, 2vw, 22px); font-size: 15px; }
.site-header nav a { text-decoration: none; color: var(--ink); white-space: nowrap; }
.site-header nav a:hover { color: var(--frog-deep); }
.nav-cta {
  background: var(--frog);
  color: #fff !important;
  padding: 8px 16px;
  border-radius: 999px;
}
.nav-cta:hover { background: var(--frog-deep); }
@media (max-width: 720px) {
  .site-header nav a:not(.nav-cta) { display: none; }
  .site-header.nav-open nav a:not(.nav-cta) { display: block; }
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 32px;
  align-items: center;
  padding: clamp(40px, 7vw, 90px) clamp(16px, 4vw, 48px) clamp(30px, 5vw, 60px);
  max-width: 1120px;
  margin: 0 auto;
}
.kicker {
  margin: 0 0 6px;
  color: var(--frog-deep);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.12em;
}
.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.15;
  text-wrap: balance;
}
.lead { margin: 0 0 22px; font-size: clamp(16px, 2vw, 18px); color: var(--ink-soft); max-width: 34em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--ink-soft);
}
.hero-facts li::before { content: "✓"; color: var(--frog); margin-right: 6px; font-weight: 700; }

.button {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 12px 26px;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
}
.button.primary { background: var(--frog); color: #fff; box-shadow: var(--shadow); }
.button.primary:hover { background: var(--frog-deep); }
.button.ghost { border-color: var(--frog); color: var(--frog-deep); }
.button.ghost:hover { background: rgba(78, 123, 60, 0.1); }
.button-note { font-size: 12px; font-weight: 400; opacity: 0.85; }

.hero-art { position: relative; min-height: 340px; }
.hero-main {
  display: block;
  width: min(100%, 420px);
  height: auto;
  margin: 0 auto;
  border-radius: 22px;
  box-shadow: var(--shadow);
  border: 6px solid #fff;
  background: #fff;
}
.float {
  position: absolute;
  width: 118px;
  height: auto;
  border-radius: 16px;
  border: 4px solid #fff;
  box-shadow: var(--shadow);
  animation: bob 6s ease-in-out infinite;
}
.f1 { left: 4%; top: 6%; }
.f2 { right: 2%; top: 30%; animation-delay: -2s; width: 104px; }
.f3 { left: 12%; bottom: 0; animation-delay: -4s; width: 128px; }
@keyframes bob {
  0%, 100% { transform: translateY(0) rotate(-2deg); }
  50% { transform: translateY(-12px) rotate(2deg); }
}
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; }
  .hero-art { min-height: 300px; }
  .float { width: 92px; }
}

/* Sections */
.section { padding: clamp(44px, 7vw, 80px) clamp(16px, 4vw, 48px); max-width: 1120px; margin: 0 auto; }
.section.alt { max-width: none; }
.section.alt > * { max-width: 1120px; margin-left: auto; margin-right: auto; }
h2 { font-size: clamp(26px, 4vw, 34px); margin: 0 0 28px; text-wrap: balance; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px 22px;
  box-shadow: 0 2px 10px rgba(80, 70, 20, 0.06);
}
.card h3 { margin: 0 0 8px; font-size: 18px; color: var(--frog-deep); }
.card p { margin: 0; font-size: 15px; color: var(--ink-soft); }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; margin: 0; padding: 0; list-style: none; counter-reset: step; }
.steps li { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 20px; position: relative; }
.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--milk);
  color: var(--ink);
  font-weight: 800;
  margin-bottom: 10px;
  border: 2px solid #E8C72C;
}
.steps h3 { margin: 0 0 6px; font-size: 17px; }
.steps p { margin: 0; font-size: 14px; color: var(--ink-soft); }

/* Download */
.download-box {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: clamp(20px, 4vw, 36px);
  box-shadow: var(--shadow);
}
.download-main { display: flex; gap: 22px; align-items: center; min-width: 0; }
.download-main img { width: 120px; height: auto; border-radius: 16px; border: 4px solid #fff; box-shadow: var(--shadow); }
.download-main h3 { margin: 0 0 4px; }
.download-main p { margin: 0 0 14px; color: var(--ink-soft); font-size: 15px; }
.download-hint { margin-top: 10px !important; font-size: 13px !important; }
.download-notes { margin: 0; padding-left: 20px; color: var(--ink-soft); font-size: 14px; display: grid; gap: 8px; align-content: center; }
@media (max-width: 860px) { .download-box { grid-template-columns: 1fr; } }
@media (max-width: 520px) { .download-main { flex-direction: column; align-items: flex-start; } }

/* Museum */
.museum-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 24px; }
.museum-head p { margin: 0; color: var(--ink-soft); font-size: 14px; }
.gallery {
  columns: 220px;
  column-gap: 14px;
}
.art {
  border: 0;
  padding: 0;
  margin: 0 0 14px;
  break-inside: avoid;
  background: var(--card);
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(80, 70, 20, 0.08);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  display: flex;
  flex-direction: column;
  text-align: left;
  font: inherit;
  color: inherit;
}
.art:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.art img { display: block; width: 100%; height: auto; background: #EFE6CC; }
.art span { padding: 8px 10px; font-size: 13px; line-height: 1.4; color: var(--ink); }
.museum-more { margin-top: 20px; font-size: 13px; color: var(--ink-soft); }

/* FAQ */
.faq { display: grid; gap: 10px; max-width: 760px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 18px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin: 10px 0 0; color: var(--ink-soft); font-size: 15px; }

/* Footer */
.site-footer {
  text-align: center;
  padding: 40px 20px 60px;
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
}
.site-footer img { width: 88px; height: auto; margin-bottom: 6px; }
.site-footer p { margin: 4px 0; }
.fine { font-size: 12.5px; color: var(--ink-soft); max-width: 40em; margin: 8px auto 0 !important; }

/* Lightbox */
.lightbox {
  border: 0;
  padding: 0;
  background: rgba(24, 28, 18, 0.9);
  color: #fff;
  max-width: min(94vw, 900px);
  width: auto;
  border-radius: 16px;
  overscroll-behavior: contain;
}
.lightbox::backdrop { background: rgba(24, 28, 18, 0.75); }
.lightbox figure { margin: 0; display: flex; flex-direction: column; }
.lightbox img {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 76vh;
  margin: 0 auto;
  border-radius: 16px 16px 0 0;
}
.lightbox figcaption {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  font-size: 14px;
  background: rgba(0, 0, 0, 0.35);
  border-radius: 0 0 16px 16px;
}
#lightboxIndex { color: rgba(255, 255, 255, 0.7); font-variant-numeric: tabular-nums; }
.lb-btn {
  position: absolute;
  border: 0;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  font-size: 26px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  cursor: pointer;
  display: grid;
  place-items: center;
}
.lb-btn:hover { background: rgba(255, 255, 255, 0.28); }
.lb-prev { left: 12px; top: 50%; transform: translateY(-50%); }
.lb-next { right: 12px; top: 50%; transform: translateY(-50%); }
.lb-close { right: 12px; top: 12px; }

/* Modern interaction layer */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.scroll-progress{position:fixed;top:0;left:0;z-index:60;width:0;height:3px;background:var(--frog);transition:width .1s linear}
.nav-toggle{display:none;border:1px solid var(--line);background:var(--card);color:var(--ink);width:42px;height:42px;border-radius:12px;padding:9px;cursor:pointer}
.nav-toggle span{display:block;height:2px;background:var(--ink);margin:5px 0;border-radius:2px;transition:transform .2s,opacity .2s}
.hero-status{display:inline-flex;align-items:center;gap:9px;margin:0 0 18px;padding:8px 10px 8px 12px;border:1px solid var(--line);border-radius:999px;background:rgba(255,253,244,.75);font-size:13px;color:var(--ink-soft);box-shadow:0 4px 16px rgba(80,70,20,.06)}
.status-dot{width:8px;height:8px;background:#6FAD4A;border-radius:50%;box-shadow:0 0 0 4px rgba(111,173,74,.15)}
.hero-status button{border:0;background:transparent;color:var(--frog-deep);font-weight:700;cursor:pointer;padding:3px 4px}
.hero-status button:hover{text-decoration:underline}
.section{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.section.in-view{opacity:1;transform:none}
.card,.steps li{transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}
.card:hover,.steps li:hover{transform:translateY(-5px);border-color:#C9B96C;box-shadow:var(--shadow)}
.steps{position:relative}
.steps li{z-index:1}
.steps li::after{content:"";position:absolute;top:38px;right:-20px;width:22px;height:2px;background:#D7C77F}
.steps li:last-child::after{display:none}
.museum-count{padding:6px 10px;border:1px solid var(--line);border-radius:999px;color:var(--frog-deep);font-size:13px;font-variant-numeric:tabular-nums;background:var(--card)}
.museum-toolbar{display:flex;align-items:center;gap:12px;margin:-8px 0 20px;padding:10px 12px;background:rgba(255,253,244,.65);border:1px solid var(--line);border-radius:14px}
.museum-toolbar input{min-width:0;flex:1;border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:#fffdf4;color:var(--ink);font:inherit}
.museum-toolbar input:focus-visible{outline:3px solid var(--milk);outline-offset:1px}
.museum-filters{display:flex;gap:6px;flex-wrap:wrap}
.filter{border:1px solid var(--line);background:transparent;color:var(--ink-soft);border-radius:999px;padding:7px 11px;cursor:pointer;font:inherit;font-size:13px}
.filter:hover,.filter.active{background:var(--frog);border-color:var(--frog);color:#fff}
.art.is-hidden{display:none}
.museum-empty{padding:30px;text-align:center;color:var(--ink-soft);background:var(--card);border:1px dashed var(--line);border-radius:14px}
.back-top{position:fixed;right:20px;bottom:20px;z-index:15;width:44px;height:44px;border:1px solid var(--line);border-radius:50%;background:var(--card);color:var(--frog-deep);font-size:20px;box-shadow:var(--shadow);cursor:pointer;opacity:0;transform:translateY(10px);pointer-events:none;transition:opacity .2s,transform .2s}
.back-top.show{opacity:1;transform:none;pointer-events:auto}

@media (max-width:720px){
  .site-header{padding:8px 14px}
  .brand{font-size:16px;gap:7px}
  .brand img{width:29px;height:44px}
  .brand em{font-size:10px}
  .nav-toggle{display:block;z-index:32}
  .site-header nav{position:absolute;top:calc(100% + 1px);right:12px;left:12px;display:flex;flex-direction:column;align-items:stretch;gap:2px;padding:10px;background:rgba(255,253,244,.98);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);opacity:0;transform:translateY(-8px);pointer-events:none;transition:opacity .2s,transform .2s}
  .site-header.nav-open nav{opacity:1;transform:none;pointer-events:auto}
  .site-header nav a{padding:10px 12px;border-radius:9px}
  .site-header nav a:hover{background:var(--bg-alt)}
  .site-header nav .nav-cta{margin-top:4px;text-align:center}
  .site-header.nav-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .site-header.nav-open .nav-toggle span:nth-child(2){opacity:0}
  .site-header.nav-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .hero{padding-top:36px;gap:10px}
  .hero h1{font-size:clamp(34px,12vw,49px)}
  .lead{font-size:16px}
  .hero-actions{display:grid;grid-template-columns:1fr 1fr}
  .hero-actions .button{padding:11px 10px;font-size:15px;text-align:center}
  .hero-art{min-height:275px;margin-top:10px}
  .hero-main{width:76%;max-width:370px}
  .float{width:75px!important;border-width:3px}
  .f1{left:0;top:6%}.f2{right:0;top:27%}.f3{left:7%;bottom:0}
  .hero-status{max-width:100%;font-size:12px}
  .cards{grid-template-columns:1fr;gap:12px}
  .section{padding-top:48px;padding-bottom:48px}
  .steps{grid-template-columns:1fr;gap:12px}
  .steps li::after{display:none}
  .download-main{gap:14px}
  .download-main img{width:94px}
  .museum-toolbar{align-items:stretch;flex-direction:column}
  .museum-filters{width:100%}
  .filter{flex:1}
  .gallery{columns:2 145px;column-gap:10px}
  .art{margin-bottom:10px}
  .art span{font-size:12px;padding:7px 8px}
  .lightbox{max-width:96vw}
  .lightbox img{max-height:70vh}
  .back-top{right:14px;bottom:14px}
}