/* =========================================================
   DUFF LAB VAULT — Shared Stylesheet
   Forest soil ecology & environmental field consultation
   ========================================================= */

:root{
  --color-bg: #FAF6EC;
  --color-bg-soft: #F1E8D6;
  --color-bg-card: #FFFFFF;
  --color-text: #2A2E26;
  --color-text-soft: #53594C;
  --color-forest: #2F4A34;
  --color-forest-dark: #203428;
  --color-moss: #6E8C5B;
  --color-soil: #8A5A3B;
  --color-gold: #B08D3E;
  --color-border: #E2D8C2;
  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;
  --shadow-card: 0 6px 24px rgba(47,74,52,0.08);
  --max-width: 1180px;
  font-size: 16px;
}

*,*::before,*::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic Medium","Meiryo","Noto Sans JP",sans-serif;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img{ max-width:100%; height:auto; display:block; border-radius: var(--radius-m); }
a{ color: var(--color-forest); text-decoration: none; }
a:hover{ text-decoration: underline; }
ul{ padding-left: 1.2em; }
.container{ max-width: var(--max-width); margin:0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header{
  position: sticky; top:0; z-index: 100;
  background: rgba(250,246,236,0.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner{
  max-width: var(--max-width); margin:0 auto; padding: 12px 24px;
  display:flex; align-items:center; justify-content:space-between; gap: 20px;
}
.brand{ display:flex; align-items:center; gap:10px; flex-shrink:0; }
.brand:hover{ text-decoration:none; }
.brand-icon{ width:40px; height:40px; flex-shrink:0; }
.brand-name{
  font-weight:700; letter-spacing: 0.06em; font-size: 1.05rem; color: var(--color-forest-dark);
  white-space: nowrap;
}
.main-nav ul{
  list-style:none; display:flex; flex-wrap:wrap; gap: 4px 18px; margin:0; padding:0; align-items:center;
}
.main-nav a{
  color: var(--color-text); font-size:0.92rem; font-weight:600; padding:8px 2px; display:inline-block;
  border-bottom: 2px solid transparent;
}
.main-nav a:hover, .main-nav a[aria-current="page"]{
  color: var(--color-forest); border-bottom-color: var(--color-moss); text-decoration:none;
}
.main-nav a.nav-cta{
  background: var(--color-forest); color:#fff; padding:8px 16px; border-radius: 999px; border-bottom:none;
}
.main-nav a.nav-cta:hover{ background: var(--color-forest-dark); }
.nav-toggle{
  display:none; background:none; border:1px solid var(--color-border); border-radius: var(--radius-s);
  width:44px; height:40px; flex-direction:column; align-items:center; justify-content:center; gap:5px; cursor:pointer;
}
.nav-toggle span{ width:22px; height:2px; background: var(--color-forest-dark); display:block; }

@media (max-width: 980px){
  .main-nav{
    display:none; position:absolute; top:100%; left:0; right:0; background: var(--color-bg);
    border-bottom:1px solid var(--color-border); box-shadow: var(--shadow-card);
  }
  .main-nav.open{ display:block; }
  .main-nav ul{ flex-direction:column; align-items:stretch; padding: 10px 24px 20px; gap:2px; }
  .main-nav a{ display:block; padding:12px 4px; border-bottom:1px solid var(--color-border); }
  .main-nav a.nav-cta{ text-align:center; margin-top:8px; }
  .nav-toggle{ display:flex; }
}

/* ---------- Hero ---------- */
.hero{
  position:relative; padding: 72px 0 60px; background:
    linear-gradient(180deg, rgba(250,246,236,0.2), rgba(250,246,236,0.95)), var(--color-bg-soft);
  overflow:hidden;
}
.hero-inner{ max-width: var(--max-width); margin:0 auto; padding:0 24px; display:grid; grid-template-columns: 1.1fr 0.9fr; gap:48px; align-items:center; }
.hero h1{ font-size: clamp(1.7rem, 3.2vw, 2.6rem); line-height:1.5; margin:0 0 20px; color: var(--color-forest-dark); }
.hero p.lead{ font-size:1.05rem; color: var(--color-text-soft); margin-bottom:28px; max-width: 46em; }
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; }
.hero-media img{ border-radius: var(--radius-l); box-shadow: var(--shadow-card); }
.page-hero{ padding: 56px 0 40px; background: var(--color-bg-soft); border-bottom:1px solid var(--color-border); }
.page-hero .eyebrow{ color: var(--color-moss); font-weight:700; letter-spacing:0.08em; font-size:0.82rem; }
.page-hero h1{ margin: 10px 0 14px; font-size: clamp(1.5rem, 2.6vw, 2.2rem); color: var(--color-forest-dark); }
.page-hero p{ max-width: 52em; color: var(--color-text-soft); }

/* ---------- Buttons ---------- */
.btn{
  display:inline-block; padding: 13px 26px; border-radius: 999px; font-weight:700; font-size:0.95rem;
  border: 2px solid transparent; cursor:pointer; transition: all .15s ease;
}
.btn-primary{ background: var(--color-forest); color:#fff; }
.btn-primary:hover{ background: var(--color-forest-dark); text-decoration:none; }
.btn-outline{ background:transparent; border-color: var(--color-forest); color: var(--color-forest); }
.btn-outline:hover{ background: var(--color-forest); color:#fff; text-decoration:none; }
.btn-block{ width:100%; text-align:center; }

/* ---------- Sections / Layout ---------- */
section{ padding: 56px 0; }
section.alt{ background: var(--color-bg-soft); }
.section-head{ max-width: 54em; margin-bottom: 36px; }
.section-head .eyebrow{ color: var(--color-moss); font-weight:700; letter-spacing:0.08em; font-size:0.82rem; text-transform:uppercase; }
.section-head h2{ font-size: clamp(1.35rem, 2.2vw, 1.9rem); margin:8px 0 12px; color: var(--color-forest-dark); }
.section-head p{ color: var(--color-text-soft); }

.grid{ display:grid; gap: 24px; }
.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); }
  .hero-inner{ grid-template-columns: 1fr; }
  .hero-media{ order:-1; }
}
@media (max-width: 620px){
  .grid-2,.grid-3,.grid-4{ grid-template-columns: 1fr; }
}

.card{
  background: var(--color-bg-card); border:1px solid var(--color-border); border-radius: var(--radius-m);
  padding: 26px; box-shadow: var(--shadow-card);
}
.card h3{ margin-top:0; color: var(--color-forest-dark); font-size:1.08rem; }
.card h3 a{ color:inherit; }
.card p{ color: var(--color-text-soft); font-size:0.95rem; }
.card-icon{ width:40px; height:40px; margin-bottom:14px; }

.tag{
  display:inline-block; background: var(--color-bg-soft); color: var(--color-forest);
  border:1px solid var(--color-border); border-radius:999px; font-size:0.78rem; font-weight:700;
  padding:4px 12px; margin:0 6px 6px 0;
}

.media-frame{ border-radius: var(--radius-l); overflow:hidden; box-shadow: var(--shadow-card); }
.media-caption{ font-size:0.82rem; color: var(--color-text-soft); margin-top:8px; }

/* ---------- Tables ---------- */
table{ width:100%; border-collapse: collapse; margin: 18px 0; font-size:0.93rem; }
th,td{ text-align:left; padding: 12px 14px; border-bottom:1px solid var(--color-border); vertical-align:top; }
th{ background: var(--color-bg-soft); color: var(--color-forest-dark); font-weight:700; }
.table-wrap{ overflow-x:auto; border-radius: var(--radius-m); border:1px solid var(--color-border); }
.table-wrap table{ margin:0; }

/* ---------- Timeline (Process) ---------- */
.timeline{ display:flex; flex-direction:column; gap:0; }
.timeline-step{ display:grid; grid-template-columns: 70px 1fr; gap:22px; padding: 22px 0; border-bottom:1px dashed var(--color-border); }
.timeline-step:last-child{ border-bottom:none; }
.timeline-num{ font-size:1.6rem; font-weight:800; color: var(--color-moss); }
.timeline-step h3{ margin:0 0 8px; color: var(--color-forest-dark); }
.timeline-step p{ color: var(--color-text-soft); margin:0; }

/* ---------- Forms ---------- */
form.form{ max-width: 780px; }
.form-row{ margin-bottom:20px; }
.form-row label{ display:block; font-weight:700; margin-bottom:6px; font-size:0.92rem; color: var(--color-forest-dark); }
.form-row .hint{ font-size:0.8rem; color: var(--color-text-soft); margin-top:4px; }
.form-grid{ display:grid; grid-template-columns:1fr 1fr; gap: 0 20px; }
@media (max-width:620px){ .form-grid{ grid-template-columns:1fr; } }
input[type=text], input[type=email], input[type=tel], input[type=number], select, textarea{
  width:100%; padding:12px 14px; border:1px solid var(--color-border); border-radius: var(--radius-s);
  font-size:0.95rem; font-family:inherit; background:#fff; color: var(--color-text);
}
textarea{ min-height:140px; resize:vertical; }
.checkbox-row{ display:flex; gap:10px; align-items:flex-start; }
.checkbox-row input{ margin-top:5px; }
.honeypot{ position:absolute; left:-9999px; width:1px; height:1px; overflow:hidden; }
.form-status{ margin-top:16px; padding:14px 16px; border-radius: var(--radius-s); display:none; font-size:0.92rem; }
.form-status.ok{ display:block; background:#E7EFE4; color: var(--color-forest-dark); border:1px solid var(--color-moss); }
.form-status.err{ display:block; background:#F7E7E2; color:#7A2E17; border:1px solid #C97A57; }

/* ---------- Footer ---------- */
.site-footer{ background: var(--color-forest-dark); color:#E8E6DC; padding: 56px 0 24px; margin-top:40px; }
.footer-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
@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:10px; margin-bottom:14px; }
.footer-brand .brand-name{ color:#fff; }
.site-footer h4,.site-footer .ft-title{ color:#D8C98A; font-size:0.9rem; letter-spacing:0.05em; margin:0 0 14px; }
.site-footer p, .site-footer a{ color:#C7CBC0; font-size:0.9rem; }
.site-footer ul{ list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:9px; }
.site-footer a:hover{ color:#fff; }
.footer-bottom{ border-top:1px solid rgba(255,255,255,0.15); margin-top:40px; padding-top:20px; font-size:0.82rem; color:#9AA291; display:flex; flex-wrap:wrap; gap:10px 24px; justify-content:space-between; }

/* ---------- Misc ---------- */
.breadcrumb{ font-size:0.85rem; color: var(--color-text-soft); margin-bottom:14px; }
.breadcrumb a{ color: var(--color-moss); }
.notice{ background: var(--color-bg-soft); border-left:4px solid var(--color-gold); border-radius: var(--radius-s); padding:18px 20px; font-size:0.92rem; color: var(--color-text-soft); margin:22px 0; }
.two-col{ display:grid; grid-template-columns: 1fr 1fr; gap:40px; align-items:start; }
@media (max-width:820px){ .two-col{ grid-template-columns:1fr; } }
.article-meta{ display:flex; gap:10px; align-items:center; margin-bottom:10px; flex-wrap:wrap; }
.toc{ background: var(--color-bg-card); border:1px solid var(--color-border); border-radius: var(--radius-m); padding:20px 24px; margin:28px 0; }
.toc h2{ font-size:1rem; margin-top:0; }
.toc ul{ margin:0; padding-left:1.2em; }
.diagram{ background:#fff; border:1px solid var(--color-border); border-radius: var(--radius-m); padding:24px; }
.cta-band{ background: var(--color-forest); color:#fff; border-radius: var(--radius-l); padding: 46px; text-align:center; }
.cta-band h2{ color:#fff; margin-top:0; }
.cta-band p{ color:#DCE6D8; max-width:40em; margin:0 auto 24px; }
.cta-band .btn-outline{ border-color:#fff; color:#fff; }
.cta-band .btn-outline:hover{ background:#fff; color: var(--color-forest); }
hr.sep{ border:none; border-top:1px solid var(--color-border); margin: 48px 0; }
.small{ font-size:0.85rem; color: var(--color-text-soft); }
.anchor-offset{ scroll-margin-top: 90px; }

h2.as-h1{font-size:2em}
h3.as-h2{font-size:1.5em}
h4.as-h3{font-size:1.17em}


.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}