/* ==========================================================================
   FERN CORE LAB — style.css
   Japanese Botanical Minimalism design system
   ========================================================================== */

:root{
  --bg:#FAF9F5;
  --bg2:#F0F2EA;
  --text:#26332C;
  --accent:#55765C;
  --accent-dark:#3F5A45;
  --accent2:#829786;
  --stone:#BDAF96;
  --wood:#8B735D;
  --white:#FFFFFF;
  --border:#E1DFD3;
  --shadow:0 10px 30px rgba(38,51,44,0.08);
  --shadow-sm:0 4px 14px rgba(38,51,44,0.07);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1180px;
  --font:'Noto Sans JP','Hiragino Sans','Yu Gothic',sans-serif;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.85;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;border-radius:var(--radius);}
a{color:var(--accent-dark);text-decoration:none;}
a:hover{text-decoration:underline;}
ul,ol{padding-left:1.3em;}
h1,h2,h3,h4,h2.as-h3,h2.as-h4,h3.as-h4{font-weight:700;line-height:1.4;margin:0 0 .6em;color:var(--text);}
h1{font-size:clamp(28px,4vw,42px);}
h2{font-size:clamp(24px,3vw,32px);}
h3,
h2.as-h3{font-size:20px;}
p{margin:0 0 1em;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.section{padding:72px 0;}
.section-tight{padding:40px 0;}
.bg-mist{background:var(--bg2);}
.bg-dark{background:var(--text);color:var(--bg);}
.bg-dark h1,.bg-dark h2,.bg-dark h3,.bg-dark h2.as-h3{color:var(--bg);}
.bg-dark a{color:#D7E2D5;}
.center{text-align:center;}
.eyebrow{
  display:inline-block;color:var(--accent);font-weight:700;letter-spacing:.08em;
  font-size:13px;margin-bottom:10px;text-transform:uppercase;
}
.lead{font-size:18px;color:var(--text);opacity:.88;}
.muted{color:var(--text);opacity:.72;}
.small{font-size:14px;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:999px;
  font-weight:700;font-size:15px;border:2px solid transparent;cursor:pointer;
  transition:.2s ease;text-decoration:none;
}
.btn-primary{background:var(--accent);color:#fff;}
.btn-primary:hover{background:var(--accent-dark);text-decoration:none;}
.btn-outline{background:transparent;border-color:var(--text);color:var(--text);}
.btn-outline:hover{background:var(--text);color:var(--bg);text-decoration:none;}
.btn-outline-light{background:transparent;border-color:#fff;color:#fff;}
.btn-outline-light:hover{background:#fff;color:var(--text);text-decoration:none;}
.btn-group{display:flex;gap:14px;flex-wrap:wrap;}
.btn-sm{padding:10px 20px;font-size:14px;}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;background:rgba(250,249,245,0.96);
  backdrop-filter:blur(6px);border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;max-width:var(--maxw);margin:0 auto;}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;}
.brand img{width:40px;height:40px;border-radius:0;}
.brand-text{font-size:19px;font-weight:700;letter-spacing:.04em;color:var(--text);}
.main-nav{display:flex;align-items:center;gap:4px;}
.main-nav ul{display:flex;list-style:none;margin:0;padding:0;gap:2px;flex-wrap:wrap;}
.main-nav a{
  display:block;padding:10px 12px;font-size:14px;font-weight:500;color:var(--text);
  border-radius:8px;white-space:nowrap;
}
.main-nav a:hover,.main-nav a.active{background:var(--bg2);color:var(--accent-dark);text-decoration:none;}
.header-cta{display:flex;gap:10px;align-items:center;}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;}
.nav-toggle svg{width:28px;height:28px;}

@media (max-width:1050px){
  .main-nav{position:fixed;top:68px;left:0;right:0;bottom:0;background:var(--bg);
    flex-direction:column;align-items:flex-start;padding:16px 24px;overflow-y:auto;
    transform:translateX(100%);transition:transform .25s ease;}
  .main-nav.open{transform:translateX(0);}
  .main-nav ul{flex-direction:column;width:100%;gap:0;}
  .main-nav a{padding:14px 6px;border-bottom:1px solid var(--border);font-size:16px;}
  .header-cta .btn-outline{display:none;}
  .nav-toggle{display:inline-flex;}
}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;}
.hero-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center;padding:64px 0;}
.hero img{box-shadow:var(--shadow);}
.page-hero{padding:56px 0 48px;background:var(--bg2);}
.page-hero .breadcrumb{margin-bottom:14px;}
@media (max-width:860px){.hero-grid{grid-template-columns:1fr;padding:36px 0;}}

.breadcrumb{font-size:13px;color:var(--text);opacity:.65;}
.breadcrumb a{color:var(--text);opacity:.8;}

/* ---------- Grid / Cards ---------- */
.grid{display:grid;gap:28px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
@media (max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr);}}
@media (max-width:620px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}}

.card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow-sm);
}
.card h3,
.card h2.as-h3{margin-bottom:.5em;}
.card-img{aspect-ratio:4/3;overflow:hidden;border-radius:var(--radius);margin-bottom:16px;}
.card-img img{width:100%;height:100%;object-fit:cover;border-radius:var(--radius);}
.icon-badge{
  width:44px;height:44px;border-radius:12px;background:var(--bg2);display:flex;align-items:center;
  justify-content:center;margin-bottom:14px;color:var(--accent);
}
.icon-badge svg{width:24px;height:24px;}

.tag{
  display:inline-block;background:var(--bg2);color:var(--accent-dark);font-size:12px;font-weight:700;
  padding:5px 12px;border-radius:999px;margin-right:6px;margin-bottom:6px;
}

/* ---------- Info blocks ---------- */
.info-list{list-style:none;margin:0;padding:0;}
.info-list li{
  padding:14px 0;border-bottom:1px solid var(--border);display:flex;gap:12px;align-items:flex-start;
}
.info-list li:last-child{border-bottom:none;}
.info-list .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);margin-top:9px;flex-shrink:0;}

.two-col{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;}
@media (max-width:860px){.two-col{grid-template-columns:1fr;}}

.img-frame{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);}
.img-frame img{width:100%;}
figure{margin:0;}
figcaption{font-size:13px;color:var(--text);opacity:.65;margin-top:10px;}

/* ---------- Accordion (plant categories) ---------- */
.accordion-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:16px;background:#fff;overflow:hidden;}
.accordion-head{
  display:flex;justify-content:space-between;align-items:center;padding:20px 24px;cursor:pointer;
  font-weight:700;font-size:18px;background:#fff;
}
.accordion-head:hover{background:var(--bg2);}
.accordion-head .chevron{transition:transform .2s;color:var(--accent);flex-shrink:0;margin-left:16px;}
.accordion-item.open .chevron{transform:rotate(180deg);}
.accordion-body{display:none;padding:0 24px 28px;}
.accordion-item.open .accordion-body{display:block;}
.accordion-body .mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:10px;}
@media (max-width:700px){.accordion-body .mini-grid{grid-template-columns:1fr;}.accordion-head{font-size:16px;padding:16px 18px;}}

/* ---------- Process steps ---------- */
.process-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
@media (max-width:900px){.process-steps{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.process-steps{grid-template-columns:1fr;}}
.step-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;position:relative;}
.step-num{font-size:34px;font-weight:700;color:var(--stone);margin-bottom:6px;display:block;}

/* ---------- Tables ---------- */
table{width:100%;border-collapse:collapse;margin:20px 0;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--border);font-size:15px;}
th{background:var(--bg2);font-weight:700;}
tr:last-child td{border-bottom:none;}
.table-wrap{overflow-x:auto;}

/* ---------- Forms ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
@media (max-width:700px){.form-grid{grid-template-columns:1fr;}}
.field{margin-bottom:20px;}
.field.full{grid-column:1/-1;}
label{display:block;font-weight:700;margin-bottom:6px;font-size:14px;}
label .req{color:#A24B3F;font-weight:700;margin-left:4px;}
input[type=text],input[type=email],input[type=tel],input[type=number],select,textarea{
  width:100%;padding:13px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);
  font-family:var(--font);font-size:15px;background:#fff;color:var(--text);
}
input:focus,select:focus,textarea:focus{outline:2px solid var(--accent2);outline-offset:1px;}
textarea{resize:vertical;min-height:120px;}
.checkbox-row{display:flex;gap:10px;align-items:flex-start;font-size:14px;}
.checkbox-row input{width:auto;margin-top:4px;}
fieldset{border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;margin-bottom:20px;}
legend{font-weight:700;padding:0 6px;}
.radio-group label{display:flex;gap:8px;font-weight:400;align-items:center;margin-bottom:8px;}
.radio-group input{width:auto;}
.form-note{font-size:13px;opacity:.7;margin-top:6px;}
.form-status{margin-top:16px;padding:14px 16px;border-radius:var(--radius-sm);display:none;font-size:14px;}
.form-status.show{display:block;}
.form-status.success{background:#E4EEE0;color:var(--accent-dark);}
.form-status.error{background:#F3E3DF;color:#8B3B2E;}
.honeypot{position:absolute;left:-9999px;opacity:0;height:0;width:0;}

/* ---------- Callout / notice ---------- */
.notice{
  background:var(--bg2);border-left:4px solid var(--accent);border-radius:var(--radius-sm);
  padding:18px 20px;margin:20px 0;font-size:15px;
}
.notice.caution{border-left-color:var(--wood);background:#F3ECE3;}
.notice strong{color:var(--accent-dark);}
.notice.caution strong{color:var(--wood);}

/* ---------- CTA band ---------- */
.cta-band{background:var(--accent);color:#fff;border-radius:24px;padding:48px;text-align:center;}
.cta-band h2{color:#fff;}
.cta-band p{opacity:.92;}

/* ---------- Footer ---------- */
.site-footer{background:var(--text);color:#D9DED6;padding:64px 0 24px;margin-top:40px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.footer-grid{grid-template-columns:1fr;}}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:14px;}
.footer-brand .brand-text{color:#fff;}
.site-footer h4,.site-footer .ft-title,
.site-footer h2.as-h4,
.site-footer h3.as-h4{color:#fff;font-size:14px;letter-spacing:.06em;margin-bottom:14px;}
.site-footer ul{list-style:none;padding:0;margin:0;}
.site-footer li{margin-bottom:9px;font-size:14px;}
.site-footer a{color:#D9DED6;}
.site-footer a:hover{color:#fff;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.14);margin-top:44px;padding-top:22px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px;color:#AEB7AA;
}

/* ---------- Insights filter ---------- */
.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin:28px 0 36px;}
.filter-btn{
  border:1px solid var(--border);background:#fff;padding:9px 18px;border-radius:999px;font-size:14px;
  cursor:pointer;font-weight:600;font-family:var(--font);color:var(--text);
}
.filter-btn.active{background:var(--accent);color:#fff;border-color:var(--accent);}
.article-card{display:none;}
.article-card.show{display:flex;}

/* ---------- Anchor offset for in-page nav (legal) ---------- */
.legal-section{padding-top:40px;scroll-margin-top:90px;}
.legal-toc{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;position:sticky;top:90px;}
.legal-toc ul{list-style:none;padding:0;margin:0;}
.legal-toc li{margin-bottom:10px;font-size:14px;}
.legal-layout{display:grid;grid-template-columns:260px 1fr;gap:40px;}
@media (max-width:860px){.legal-layout{grid-template-columns:1fr;}.legal-toc{position:static;}}

/* ---------- Scenario / timeline numbers ---------- */
.num-circle{
  width:40px;height:40px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}

/* ---------- 404 ---------- */
.error-page{min-height:50vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:80px 0;}

/* ---------- utility ---------- */
.mt-0{margin-top:0;}
.flex{display:flex;}
.gap-12{gap:12px;}
.align-center{align-items:center;}
.wrap{flex-wrap:wrap;}
hr.div{border:none;border-top:1px solid var(--border);margin:40px 0;}


.site-footer .ft-title{display:block;margin-top:0;font-weight:700;line-height:1.4}
.skip-link{position:absolute;left:-9999px;top:0;z-index:10000;background:#111;color:#fff;padding:10px 16px;font-size:14px;text-decoration:none;border-radius:0 0 6px 0}
.skip-link:focus{left:0;outline:2px solid #fff;outline-offset:-4px}

h2.as-h4{font-size:1em}
h3.as-h4{font-size:1em}
h3.as-h5{font-size:.83em}
/*as-h*/