*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:#1a1a1a;line-height:1.78;font-size:16px}
a{color:#00695c;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

.site-header{background:#fff;border-bottom:1px solid #e0e0e0;position:sticky;top:0;z-index:200}
.header-inner{max-width:1080px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:#111;font-weight:600;font-size:.95rem}
.brand:hover{text-decoration:none}
.brand img{border-radius:8px}
.brand em{font-style:normal;color:#00695c;font-weight:700}
.site-nav ul{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none}
.site-nav a{color:#555;font-size:.9rem;padding:4px 0}
.site-nav a.active{color:#00695c;font-weight:600;border-bottom:2px solid #00695c}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:#333;transition:.2s}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.ads-top-bar{background:#fafafa;border-bottom:1px solid #eee;padding:10px 0}
.applist-title{font-size:.78rem;color:#888;text-align:center;margin-bottom:6px}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
#ads .caption{font-size:.7rem;color:#666;margin-top:4px;text-align:center;max-width:70px;line-height:1.3}

.cascade-wrap{max-width:960px;margin:0 auto;padding:32px 20px 56px;position:relative}
.cascade-wrap::before{content:"";position:absolute;left:28px;top:120px;bottom:40px;width:2px;background:linear-gradient(180deg,#00695c 0%,#b2dfdb 100%);border-radius:2px}

.hero-cascade{background:linear-gradient(145deg,#e0f2f1 0%,#fff 70%);border:1px solid #b2dfdb;border-radius:16px;padding:32px 28px 28px 56px;margin-bottom:36px;position:relative}
.hero-cascade::before{content:"";position:absolute;left:20px;top:36px;width:14px;height:14px;background:#00695c;border-radius:50%;box-shadow:0 0 0 4px #e0f2f1}
.hero-cascade .tag{display:inline-block;background:#00695c;color:#fff;font-size:.76rem;font-weight:600;padding:4px 12px;border-radius:999px;margin-bottom:12px;letter-spacing:.04em}
.hero-cascade h1{font-size:1.68rem;line-height:1.35;margin-bottom:14px;color:#111;max-width:720px}
.hero-cascade .lede{color:#444;font-size:1.01rem;margin-bottom:10px;max-width:720px}

.jump-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:32px;padding-left:44px}
.jump-row a{display:inline-block;padding:7px 14px;background:#fafafa;border:1px solid #e8e8e8;border-radius:999px;font-size:.84rem;color:#555}
.jump-row a:hover{background:#e0f2f1;border-color:#80cbc4;color:#00695c;text-decoration:none}

.stair-block{position:relative;background:#fff;border:1px solid #eee;border-radius:14px;padding:24px 26px 24px 56px;margin-bottom:28px;box-shadow:0 2px 8px rgba(0,0,0,.04);transition:transform .2s,border-color .2s}
.stair-block:hover{border-color:#b2dfdb}
.stair-block::before{content:"";position:absolute;left:-36px;top:28px;width:12px;height:12px;background:#fff;border:3px solid #00695c;border-radius:50%;z-index:2}
.stair-block:nth-child(3){margin-left:0}
.stair-block:nth-child(4){margin-left:16px}
.stair-block:nth-child(5){margin-left:32px}
.stair-block:nth-child(6){margin-left:48px}
.stair-block:nth-child(7){margin-left:64px}
.stair-block:nth-child(8){margin-left:48px}
.stair-block:nth-child(9){margin-left:32px}

.stair-block h2{font-size:1.18rem;margin-bottom:12px;color:#222}
.stair-block p{margin-bottom:10px;color:#333}
.stair-block ul{margin:8px 0 12px 20px;color:#333}
.stair-block li{margin-bottom:5px}
.stair-block figure{margin:16px 0;border-radius:10px;overflow:hidden;border:1px solid #eee}
.stair-block figcaption{font-size:.83rem;color:#777;padding:8px 12px;background:#fafafa}

.note-teal{background:#e0f2f1;border-left:4px solid #00695c;padding:13px 16px;margin:14px 0;border-radius:0 8px 8px 0;font-size:.94rem;color:#444}

.inline-pair{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:14px 0}
.inline-pair .mini-card{background:#fafafa;border:1px solid #eee;border-radius:10px;padding:14px 16px}
.inline-pair .mini-card h3{font-size:.92rem;color:#00695c;margin-bottom:6px}

.faq-stair{background:#fafafa;border-radius:12px;padding:20px 22px;margin-top:8px}
.faq-stair p{margin-bottom:9px;color:#333;font-size:.96rem}
.faq-stair p:last-child{margin-bottom:0}

.read-more{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.read-more a{display:inline-block;padding:8px 14px;background:#fafafa;border:1px solid #e8e8e8;border-radius:999px;font-size:.88rem;color:#555}
.read-more a:hover{background:#e0f2f1;border-color:#80cbc4;color:#00695c;text-decoration:none}

.site-footer{background:#fafafa;border-top:1px solid #eee;padding:28px 20px;text-align:center;font-size:.88rem;color:#666}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 16px;margin-bottom:10px}
.footer-links a{color:#555}
.footer-sub{font-size:.82rem;color:#888;margin-top:4px}

.prose-page{max-width:780px;margin:0 auto;padding:32px 20px 48px}
.prose-page h1{font-size:1.5rem;margin-bottom:16px}
.prose-page h2{font-size:1.12rem;margin:22px 0 10px}
.prose-page p{margin-bottom:12px;color:#333}
.error-page{text-align:center;padding:60px 20px}
.error-page h1{font-size:3rem;color:#00695c}

@media(max-width:768px){
  .cascade-wrap::before{left:18px}
  .hero-cascade,.stair-block{padding-left:40px}
  .hero-cascade::before,.stair-block::before{left:-22px}
  .stair-block:nth-child(n){margin-left:0!important}
  .jump-row{padding-left:0}
  .inline-pair{grid-template-columns:1fr}
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #eee;padding:12px 20px;display:none;box-shadow:0 4px 12px rgba(0,0,0,.06)}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:0}
  .site-nav li{border-bottom:1px solid #f0f0f0}
  .site-nav a{display:block;padding:12px 0}
  .header-inner{position:relative;flex-wrap:wrap}
  .hero-cascade h1{font-size:1.35rem}
}