/* ===== LANG SYSTEM ===== */
html[lang="ja"] .lang-en { display: none !important; }
html[lang="en"] .lang-ja { display: none !important; }

/* ===== RESET & ROOT ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f4f6ee;
  --surface: #ffffff;
  --border: #c8d0ae;
  --text: #2d2d2d;
  --text-2: #4a4a4a;
  --text-3: #888888;
  --accent: #5c6e2e;
  --accent-dark: #3f4d1e;
  --accent-light: #e8edda;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
img { display: block; max-width: 100%; }

/* ===== LAYOUT ===== */
.container { max-width: 960px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 720px; margin: 0 auto; padding: 0 24px; }
.main-pad { padding-top: 40px; padding-bottom: 80px; }

/* ===== HEADER / NAV ===== */
header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

nav {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 0.95rem;
  white-space: nowrap;
  flex-shrink: 0;
  color: var(--text);
}
.nav-logo:hover { text-decoration: none; }
.logo-icon { font-size: 1.5rem; }

.nav-links {
  display: flex;
  gap: 2px;
  list-style: none;
  flex: 1;
}

.nav-links a {
  padding: 6px 13px;
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--text-2);
  font-weight: 500;
  transition: all 0.15s;
  display: block;
}
.nav-links a:hover { color: var(--text); background: var(--accent-light); text-decoration: none; }
.nav-links a.active { color: var(--accent-dark); background: var(--accent-light); font-weight: 700; }

/* ===== LANG SWITCHER ===== */
.lang-switcher {
  display: flex;
  align-items: center;
  background: #dce4c8;
  border-radius: 20px;
  padding: 3px;
  gap: 2px;
  flex-shrink: 0;
}

.lang-btn {
  background: none;
  border: none;
  padding: 4px 13px;
  border-radius: 16px;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--text-3);
  transition: all 0.15s;
  font-family: inherit;
  letter-spacing: 0.02em;
}
.lang-btn.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.12);
}

/* ===== BACK BAR ===== */
.back-bar { padding: 18px 0 0; }
.back-bar a {
  font-size: 0.84rem;
  color: var(--text-3);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.back-bar a:hover { color: var(--text-2); text-decoration: none; }

/* ===== HERO ===== */
.hero {
  padding: 56px 0 44px;
  text-align: center;
}
.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.2;
  margin-bottom: 14px;
}
.hero .sub {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 520px;
  margin: 0 auto;
}

/* ===== PAGE HERO (inner pages) ===== */
.page-hero { padding: 36px 0 28px; }
.page-hero h1 {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.4px;
  margin-bottom: 10px;
}
.page-hero .sub { font-size: 1rem; color: var(--text-2); }

/* ===== STATS BAR ===== */
.stats-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  justify-content: center;
  margin-bottom: 32px;
  overflow: hidden;
}
.stat-item {
  flex: 1;
  max-width: 240px;
  padding: 20px 24px;
  text-align: center;
  border-right: 1px solid var(--border);
}
.stat-item:last-child { border-right: none; }
.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-dark);
  display: block;
  line-height: 1;
  margin-bottom: 4px;
}
.stat-label { font-size: 0.8rem; color: var(--text-3); display: block; }

/* ===== FILTER BAR ===== */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.filter-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.83rem;
  cursor: pointer;
  color: var(--text-2);
  transition: all 0.15s;
  font-family: inherit;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.filter-count {
  margin-left: auto;
  font-size: 0.83rem;
  color: var(--text-3);
}

/* ===== OIL LIST & CARDS ===== */
.oil-list { display: flex; flex-direction: column; gap: 12px; }

.oil-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 18px;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.oil-card:hover { box-shadow: var(--shadow); border-color: #d8d4ca; }

.oil-rank {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-3);
  min-width: 32px;
  text-align: center;
  flex-shrink: 0;
}
.oil-rank.gold { color: #5c6e2e; }
.oil-rank.silver { color: #606860; }
.oil-rank.bronze { color: #8a9a50; }

.oil-icon { font-size: 2rem; flex-shrink: 0; }

.oil-thumb {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 8px;
  flex-shrink: 0;
  background: var(--bg);
}

.oil-body { flex: 1; min-width: 0; }

.oil-name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.68rem;
  font-weight: 700;
  border-radius: 4px;
  padding: 2px 7px;
}
.badge-verified { background: #ddeedd; color: #2a6a2a; }

.oil-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 7px;
}
.chip {
  font-size: 0.78rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 9px;
  color: var(--text-2);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.chip.poly {
  background: var(--accent-light);
  border-color: #b8cc88;
  color: var(--accent-dark);
  font-weight: 700;
}

.oil-best { font-size: 0.8rem; color: var(--text-3); margin-bottom: 6px; }

.oil-desc {
  font-size: 0.8rem;
  color: var(--text-2);
  line-height: 1.5;
  margin-top: 4px;
}

.chip.acid {
  background: #eaf3fb;
  border-color: #b0d4ee;
  color: #2a5a80;
  font-weight: 600;
}

.oil-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  flex-shrink: 0;
}
.oil-price { font-size: 1.2rem; font-weight: 800; }

.btn {
  display: inline-block;
  background: var(--text);
  color: #fff;
  border: none;
  border-radius: 7px;
  padding: 8px 18px;
  font-size: 0.83rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: background 0.15s;
}
.btn:hover { background: #1e2a10; text-decoration: none; color: #fff; }
.btn-outline {
  background: none;
  border: 1.5px solid var(--border);
  color: var(--text-2);
}
.btn-outline:hover { background: var(--bg); border-color: #bbb; color: var(--text); }
.btn-gold { background: var(--accent); }
.btn-gold:hover { background: var(--accent-dark); }

/* ===== HOW TO CHOOSE ===== */
.how-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
  margin: 40px 0;
}
.how-box h2 { font-size: 1.15rem; font-weight: 700; margin-bottom: 18px; }
.how-steps { display: flex; flex-direction: column; gap: 14px; }
.how-step { display: flex; gap: 14px; }
.step-num {
  width: 26px; height: 26px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.78rem; font-weight: 800;
  flex-shrink: 0; margin-top: 2px;
}
.step-text { font-size: 0.9rem; color: var(--text-2); }
.step-text strong { color: var(--text); display: block; margin-bottom: 2px; font-size: 0.95rem; }

/* ===== DARK CALLOUT ===== */
.callout {
  background: linear-gradient(135deg, #1e2612 0%, #2e3a1a 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 30px 34px;
  margin: 40px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.callout-text h2 { font-size: 1.25rem; font-weight: 700; margin-bottom: 5px; }
.callout-text p { font-size: 0.88rem; color: #a8b890; }
.callout a.btn { background: var(--accent); flex-shrink: 0; }
.callout a.btn:hover { background: var(--accent-dark); }

/* ===== SECTION HEADER ===== */
.sec-head { margin-bottom: 6px; }
.sec-head h2 { font-size: 1.4rem; font-weight: 800; }
.sec-head p { font-size: 0.93rem; color: var(--text-2); margin-top: 5px; }

/* ===== RESEARCH CARDS ===== */
.res-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin: 22px 0;
}
.res-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: box-shadow 0.2s;
}
.res-card:hover { box-shadow: var(--shadow); }
.res-card .rc-tag {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent-dark);
  margin-bottom: 7px;
}
.res-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
.res-card p { font-size: 0.87rem; color: var(--text-2); }
.rc-stats { display: flex; gap: 20px; margin-top: 14px; flex-wrap: wrap; }
.rc-stat { text-align: center; }
.rc-stat .n { font-size: 1.3rem; font-weight: 800; color: var(--accent-dark); display: block; line-height: 1; }
.rc-stat .l { font-size: 0.72rem; color: var(--text-3); margin-top: 3px; }

/* ===== DEEP DIVE ===== */
.deep-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 20px 0;
}
.deep-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 14px;
  text-align: center;
  transition: box-shadow 0.2s, border-color 0.2s;
  display: block;
  color: var(--text);
}
.deep-card:hover { box-shadow: var(--shadow); border-color: #ccc; text-decoration: none; }
.deep-card .dc-icon { font-size: 1.8rem; margin-bottom: 8px; }
.deep-card h3 { font-size: 0.88rem; font-weight: 700; margin-bottom: 5px; }
.deep-card p { font-size: 0.78rem; color: var(--text-3); }

/* ===== KEY FACTS ===== */
.facts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 20px 0;
}
.fact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  text-align: center;
}
.fact-card .fn { font-size: 1.6rem; font-weight: 800; color: var(--accent-dark); display: block; }
.fact-card .fl { font-size: 0.78rem; color: var(--text-3); margin-top: 4px; }

/* ===== BLOG CARDS ===== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin: 22px 0;
}
.blog-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  transition: box-shadow 0.2s;
  color: var(--text);
}
.blog-card:hover { box-shadow: var(--shadow); text-decoration: none; }
.bc-meta { display: flex; align-items: center; gap: 8px; }
.bc-icon { font-size: 1.2rem; }
.bc-cat {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-dark);
}
.bc-time { font-size: 0.72rem; color: var(--text-3); margin-left: auto; }
.blog-card h3 { font-size: 0.97rem; font-weight: 700; line-height: 1.4; }
.blog-card p { font-size: 0.86rem; color: var(--text-2); flex: 1; }
.read-more { font-size: 0.8rem; color: var(--accent-dark); font-weight: 700; }

/* ===== PRODUCER CARDS ===== */
.producer-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin: 22px 0;
}
.producer-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.pc-head { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 11px; }
.pc-emoji { font-size: 2.4rem; flex-shrink: 0; }
.pc-title h3 { font-size: 1rem; font-weight: 700; }
.pc-origin { font-size: 0.8rem; color: var(--text-3); margin-top: 2px; }
.producer-card p { font-size: 0.87rem; color: var(--text-2); margin-bottom: 12px; }
.pc-chips { display: flex; gap: 8px; flex-wrap: wrap; }
.pc-chip {
  font-size: 0.78rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 9px;
  color: var(--text-2);
}
.pc-chip strong { color: var(--text); }

/* ===== CULTIVAR CARDS ===== */
.cultivar-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin: 22px 0;
}
.cultivar-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 22px;
}
.cultivar-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 3px; }
.cv-origin { font-size: 0.8rem; color: var(--text-3); margin-bottom: 10px; }
.cv-traits { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 11px; }
.cv-trait {
  font-size: 0.72rem;
  background: var(--accent-light);
  color: var(--accent-dark);
  border-radius: 4px;
  padding: 3px 8px;
  font-weight: 700;
}
.cultivar-card p { font-size: 0.87rem; color: var(--text-2); }

/* ===== ABOUT PAGE ===== */
.icon-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}
.icon-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.ic-label {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 7px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.icon-card p { font-size: 0.87rem; color: var(--text-2); }

.health-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 20px;
}
.health-card { border-top: 3px solid var(--accent); padding-top: 14px; }
.hc-label {
  font-size: 0.93rem;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 7px;
}
.health-card p { font-size: 0.87rem; color: var(--text-2); }

.disclosure {
  background: #f0f4e8;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
}
.disclosure .disc-label {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 10px;
}
.disclosure p { font-size: 0.87rem; color: var(--text-2); margin-bottom: 10px; }
.disclosure p:last-child { margin-bottom: 0; }

/* ===== PROSE (legal pages) ===== */
.prose-section { margin-bottom: 44px; }
.prose-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.prose-section p { color: var(--text-2); margin-bottom: 11px; font-size: 0.93rem; }
.prose-section p:last-child { margin-bottom: 0; }
.prose-section ul { list-style: disc; padding-left: 22px; color: var(--text-2); font-size: 0.93rem; }
.prose-section ul li { margin-bottom: 7px; }

/* ===== CONTACT FORM ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 28px;
}
.contact-form-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-2);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 13px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 0.9rem;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.15s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { outline: none; border-color: var(--accent); }
.form-group textarea { resize: vertical; min-height: 110px; }

.contact-info h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 14px; }
.contact-info p { font-size: 0.9rem; color: var(--text-2); margin-bottom: 20px; }
.faq-item { margin-bottom: 18px; }
.faq-q { font-size: 0.92rem; font-weight: 700; margin-bottom: 5px; }
.faq-a { font-size: 0.87rem; color: var(--text-2); }

/* ===== DIVIDER ===== */
hr.divider { border: none; border-top: 1px solid var(--border); margin: 40px 0; }

/* ===== FOOTER ===== */
footer {
  background: #e4ead6;
  border-top: 1px solid var(--border);
  padding: 48px 24px 28px;
  margin-top: 80px;
}
.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}
.footer-col h3 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-3);
  font-weight: 800;
  margin-bottom: 14px;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-col ul a { font-size: 0.87rem; color: var(--text-2); }
.footer-col ul a:hover { color: var(--text); text-decoration: none; }
.footer-newsletter input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid #b0bc90;
  border-radius: 6px;
  font-size: 0.87rem;
  margin-bottom: 8px;
  background: #fff;
  font-family: inherit;
}
.footer-newsletter button {
  width: 100%;
  padding: 9px 12px;
  background: var(--text);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 0.87rem;
  cursor: pointer;
  font-weight: 700;
  font-family: inherit;
  transition: background 0.15s;
}
.footer-newsletter button:hover { background: #1e2a10; }
.footer-bottom {
  max-width: 960px;
  margin: 0 auto;
  border-top: 1px solid #c0caa8;
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom > span { font-size: 0.8rem; color: #7a8a60; }
.footer-legal { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-legal a { font-size: 0.8rem; color: #7a8a60; }
.footer-legal a:hover { color: var(--text-2); text-decoration: none; }

/* ===== RESPONSIVE ===== */
@media (max-width: 800px) {
  .hero h1 { font-size: 1.9rem; }
  .page-hero h1 { font-size: 1.7rem; }
  .res-grid { grid-template-columns: 1fr; }
  .deep-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-grid { grid-template-columns: 1fr; }
  .producer-grid { grid-template-columns: 1fr; }
  .cultivar-grid { grid-template-columns: 1fr; }
  .facts-grid { grid-template-columns: repeat(2, 1fr); }
  .icon-grid { grid-template-columns: 1fr; }
  .health-grid { grid-template-columns: 1fr; }
  .callout { flex-direction: column; text-align: center; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  nav { gap: 12px; }
  .nav-links { display: none; }
  .stats-bar { flex-direction: column; }
  .stat-item { border-right: none; border-bottom: 1px solid var(--border); max-width: 100%; }
  .stat-item:last-child { border-bottom: none; }
  .oil-card { flex-wrap: wrap; }
  .oil-right { flex-direction: row; align-items: center; width: 100%; justify-content: space-between; }
  .footer-inner { grid-template-columns: 1fr; }
  .deep-grid { grid-template-columns: 1fr 1fr; }
  .facts-grid { grid-template-columns: 1fr 1fr; }
}