/* Aquarium Japan guide — editorial design system */
:root{
  --c-primary:#004d73;
  --c-primary-2:#0a6f96;
  --c-accent:#26c6da;
  --c-gold:#d9b26a;
  --c-base:#f3f8fa;
  --c-paper:#ffffff;
  --c-ink:#14202b;
  --c-muted:#4e6170;
  --c-line:#d5e3ea;
  --c-dark:#06222f;
  --radius:14px;
  --shadow:0 10px 30px rgba(0,40,60,.10);
  --font-serif:"Playfair Display","Noto Serif JP",Georgia,serif;
  --font-sans:"Noto Sans JP","Hiragino Sans","Yu Gothic",system-ui,-apple-system,sans-serif;
  --maxw:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font-sans);color:var(--c-ink);background:var(--c-base);line-height:1.8;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--c-primary-2)}
h1,h2,h3{line-height:1.35;margin:0 0 .6em;font-family:var(--font-serif)}
h1{font-size:clamp(2rem,4.2vw,3.2rem)}
h2{font-size:clamp(1.6rem,3vw,2.2rem)}
h3{font-size:1.2rem}
p{margin:0 0 1em}
:focus-visible{outline:3px solid var(--c-accent);outline-offset:3px;border-radius:4px}
.container{width:min(100% - 2.5rem,var(--maxw));margin-inline:auto}
.narrow{max-width:820px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip-link{position:absolute;left:-999px;top:8px;background:var(--c-paper);padding:.5rem 1rem;z-index:100}
.skip-link:focus{left:8px}
.section{padding:clamp(3.5rem,8vw,6rem) 0}
.section-tint{background:#e8f2f6}
.section-dark{background:var(--c-dark);color:#e7f2f7}
.section-dark h2,.section-dark h3{color:#fff}
.section-head{max-width:720px;margin-bottom:2.2rem}
.section-lead{color:var(--c-muted);font-size:1.05rem}
.section-dark .section-lead{color:#b9d2dd}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(243,248,250,.94);backdrop-filter:blur(8px);border-bottom:1px solid transparent;transition:border-color .2s,box-shadow .2s}
.site-header.is-scrolled{border-color:var(--c-line);box-shadow:0 2px 14px rgba(0,40,60,.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:68px}
.brand{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--font-serif);font-weight:700;font-size:1.15rem;color:var(--c-primary);text-decoration:none}
.brand-mark{width:30px;height:30px;color:var(--c-accent)}
.nav-desktop{display:flex;gap:1.4rem}
.nav-desktop a{color:var(--c-ink);text-decoration:none;font-size:.95rem}
.nav-desktop a:hover{color:var(--c-primary-2)}
.header-tools{display:flex;align-items:center;gap:.8rem}
.lang-toggle{display:inline-flex;border:1px solid var(--c-line);border-radius:999px;overflow:hidden;background:var(--c-paper)}
.lang-toggle button{border:0;background:transparent;padding:.4rem .8rem;font:inherit;font-size:.85rem;cursor:pointer;color:var(--c-muted)}
.lang-toggle button.is-active{background:var(--c-primary);color:#fff}
.menu-toggle{display:none;border:0;background:transparent;width:44px;height:44px;cursor:pointer;position:relative}
.menu-toggle .bars,.menu-toggle .bars::before,.menu-toggle .bars::after{display:block;width:22px;height:2px;background:var(--c-ink);position:absolute;left:11px;transition:transform .2s}
.menu-toggle .bars{top:21px}
.menu-toggle .bars::before,.menu-toggle .bars::after{content:"";left:0}
.menu-toggle .bars::before{top:-7px}
.menu-toggle .bars::after{top:7px}
.menu-toggle[aria-expanded="true"] .bars{background:transparent}
.menu-toggle[aria-expanded="true"] .bars::before{transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] .bars::after{transform:translateY(-7px) rotate(-45deg)}
.mobile-menu{display:none;background:var(--c-paper);border-top:1px solid var(--c-line)}
.mobile-menu.is-open{display:block}
.mobile-menu-inner{display:flex;flex-direction:column;padding:1rem 0}
.mobile-menu-inner a{padding:.8rem 0;border-bottom:1px solid var(--c-line);text-decoration:none;color:var(--c-ink)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.9rem 1.5rem;border-radius:999px;font:inherit;font-weight:600;text-decoration:none;border:0;cursor:pointer;transition:transform .15s,box-shadow .2s,background .2s;min-height:48px}
.btn-primary{background:var(--c-accent);color:var(--c-dark);box-shadow:0 8px 22px rgba(38,198,218,.35)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}
.btn-block{width:100%}

/* hero */
.hero{position:relative;min-height:min(92vh,760px);display:flex;align-items:center;color:#fff;overflow:hidden;background:var(--c-dark)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(120deg,rgba(0,30,45,.72) 0%,rgba(0,40,60,.38) 55%,rgba(0,40,60,.15) 100%);z-index:1}
.hero-content{position:relative;z-index:2;padding:6rem 0 4rem;max-width:760px}
.hero .eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:.8rem;color:var(--c-accent);margin-bottom:1rem;font-weight:600}
.hero h1{color:#fff;text-shadow:0 2px 16px rgba(0,0,0,.25)}
.hero .lede{font-size:1.1rem;max-width:620px;color:#e4f1f6}
.hero-meta{list-style:none;padding:0;margin:1.8rem 0 0;display:flex;flex-wrap:wrap;gap:.6rem 1.4rem;font-size:.9rem;color:#cfe6ef}
.hero-meta li::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--c-accent);margin-right:.5rem;vertical-align:middle}

/* intro */
.intro-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:3rem;align-items:center}
.intro-figure{margin:0;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.intro-figure img{width:100%;aspect-ratio:3/2;object-fit:cover}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:.8rem;margin-top:1.6rem}
.stat{background:var(--c-paper);border:1px solid var(--c-line);border-radius:12px;padding:1rem .8rem;text-align:center}
.stat-value{display:block;font-family:var(--font-serif);font-size:1.7rem;color:var(--c-primary);font-weight:700}
.stat-label{display:block;font-size:.78rem;color:var(--c-muted);line-height:1.4}

/* articles */
.article-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.6rem}
.article-card{background:var(--c-paper);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;border:1px solid var(--c-line)}
.article-card-img{position:relative;aspect-ratio:3/2;overflow:hidden;background:#cfe3ea}
.article-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.article-card:hover .article-card-img img{transform:scale(1.04)}
.article-chip{position:absolute;left:12px;top:12px;background:rgba(255,255,255,.94);color:var(--c-primary);font-size:.75rem;padding:.25rem .7rem;border-radius:999px;font-weight:600}
.article-card-body{padding:1.3rem 1.4rem 1.5rem;display:flex;flex-direction:column;flex:1}
.article-title{font-size:1.25rem}
.article-excerpt{color:var(--c-muted);font-size:.96rem}
.article-body{border-top:1px dashed var(--c-line);margin-top:.4rem;padding-top:.9rem}
.article-body[hidden]{display:none}
.article-body p{font-size:.96rem}
.article-toggle{margin-top:auto;align-self:flex-start;background:transparent;border:1.5px solid var(--c-primary);color:var(--c-primary);border-radius:999px;padding:.55rem 1.1rem;font:inherit;font-size:.9rem;font-weight:600;cursor:pointer}
.article-toggle:hover{background:var(--c-primary);color:#fff}

/* tips */
.tip-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1.2rem}
.tip-card{background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius);padding:1.5rem}
.tip-icon{width:34px;height:34px;fill:none;stroke:var(--c-primary-2);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;margin-bottom:.8rem}
.tip-card p{color:var(--c-muted);font-size:.95rem;margin:0}

/* seasons */
.season-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1.2rem}
.season-card{border-radius:var(--radius);overflow:hidden;background:var(--c-paper);box-shadow:var(--shadow);border:1px solid var(--c-line)}
.season-head{padding:1.2rem 1.3rem;color:#fff}
.season-head h3{margin:0;color:#fff;font-size:1.3rem}
.season-months{margin:.2rem 0 0;font-size:.85rem;opacity:.92}
.season-card > p{padding:1rem 1.3rem 1.4rem;margin:0;color:var(--c-muted);font-size:.95rem}
.season-spring .season-head{background:linear-gradient(135deg,#3a9d7a,#6cc3a0)}
.season-summer .season-head{background:linear-gradient(135deg,#e3a23b,#f0c35c)}
.season-autumn .season-head{background:linear-gradient(135deg,#a4522e,#cf7a4a)}
.season-winter .season-head{background:linear-gradient(135deg,#2c5d86,#5d8fb8)}

/* lead form */
.lead-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.benefits{list-style:none;padding:0;margin:1.4rem 0 0}
.benefits li{padding:.55rem 0 .55rem 1.8rem;position:relative}
.benefits li::before{content:"";position:absolute;left:0;top:1.05rem;width:12px;height:12px;border-radius:50%;background:var(--c-accent)}
.lead-card{background:var(--c-paper);color:var(--c-ink);border-radius:var(--radius);padding:2rem;box-shadow:0 18px 40px rgba(0,0,0,.25)}
.field{margin-bottom:1rem}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:.35rem}
.field input{width:100%;padding:.8rem .9rem;border:1.5px solid var(--c-line);border-radius:10px;font:inherit;background:#fbfdfe;min-height:48px}
.field input:focus{border-color:var(--c-primary-2);outline:none;box-shadow:0 0 0 3px rgba(38,198,218,.25)}
.field input.is-invalid{border-color:#b3261e}
.check{display:flex;gap:.6rem;align-items:flex-start;font-size:.9rem;margin:.4rem 0 1rem}
.check input{margin-top:.4rem;width:18px;height:18px;flex-shrink:0}
.check input.is-invalid{outline:2px solid #b3261e}
.form-error{color:#b3261e;font-size:.9rem}
.form-security{font-size:.8rem;color:var(--c-muted);margin:.9rem 0 0}
.lead-success{text-align:center;padding:2rem 1rem}
.lead-success h3{color:var(--c-primary)}
.lead-success[hidden]{display:none}
.lead-card form[hidden]{display:none}

/* faq */
.faq-item{border-bottom:1px solid var(--c-line)}
.faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;gap:1rem;background:none;border:0;padding:1.2rem 0;font:inherit;font-size:1.05rem;font-weight:600;text-align:left;cursor:pointer;color:var(--c-ink)}
.faq-icon{position:relative;width:18px;height:18px;flex-shrink:0}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;left:0;top:8px;width:18px;height:2px;background:var(--c-primary);transition:transform .2s}
.faq-icon::after{transform:rotate(90deg)}
.faq-question[aria-expanded="true"] .faq-icon::after{transform:rotate(0)}
.faq-panel{padding:0 0 1.2rem}
.faq-panel[hidden]{display:none}
.faq-panel p{color:var(--c-muted);margin:0}

/* legal */
.legal-page{padding:clamp(2.5rem,6vw,4.5rem) 0}
.legal-page h1{color:var(--c-primary)}
.legal-page .lede{font-size:1.08rem;color:var(--c-muted)}
.legal-section{margin:1.8rem 0}
.legal-section h2{font-size:1.3rem;color:var(--c-ink)}
.updated{font-size:.88rem;color:var(--c-muted)}
.back-links{margin-top:2.4rem;font-size:.95rem}

/* footer */
.site-footer{background:var(--c-dark);color:#b9d2dd;padding:3.5rem 0 1.5rem;font-size:.92rem}
.site-footer .brand{color:#fff}
.site-footer .brand-mark{color:var(--c-accent)}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:2rem}
.site-footer h3{font-size:1rem;color:#fff;font-family:var(--font-sans)}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:.4rem 0}
.site-footer a{color:#cfe6ef;text-decoration:none}
.site-footer a:hover{color:var(--c-accent)}
.disclaimer{font-size:.82rem;opacity:.85}
.footer-bottom{margin-top:2.5rem;padding-top:1.2rem;border-top:1px solid rgba(255,255,255,.12);font-size:.82rem;opacity:.85}
.footer-bottom p{margin:0}

/* reveal with safety net */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.reveal.is-visible{opacity:1;transform:none}

@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .intro-grid,.lead-grid{gap:2rem}
}
@media (max-width:768px){
  .nav-desktop{display:none}
  .menu-toggle{display:block}
  .intro-grid,.lead-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .lang-toggle button{padding:.35rem .6rem}
}
@media (max-width:480px){
  .container{width:min(100% - 1.6rem,var(--maxw))}
  .hero-content{padding:5rem 0 3rem}
  .article-grid{grid-template-columns:1fr}
  .lead-card{padding:1.4rem}
  .brand span{font-size:1rem}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}