/* ============================================================
   style.css — Rakubaco Design System
   ヘルスケア機器メーカー コーポレートサイト
   方針: 信頼・正確・安全。白基調＋落ち着いたブルー。
   フラット／装飾とグラデは最小限／角丸控えめ／高可読性。
   ============================================================ */

:root{
  /* surfaces & ink (high contrast for readability) */
  --paper:#ffffff;
  --tint:#f3f7fb;          /* light section band */
  --tint-2:#f7fafd;
  --ink:#16314a;           /* headings / strong text */
  --body:#3a4f63;          /* body copy */
  --muted:#5f7488;         /* captions (still AA on white) */
  --line:#e1e8f0;          /* hairlines */
  /* brand — calm medical blue (not neon) */
  --blue:#15639e;
  --blue-h:#0f4d7c;
  --blue-2:#4a90c4;
  --blue-soft:#e9f1f8;
  --blue-soft-2:#f1f6fb;
  --green:#2f8f6e;         /* health accent, used sparingly */
  --green-soft:#e8f3ee;

  /* legacy aliases (inline styles / theme.css reference these) */
  --black:var(--ink);
  --black-soft:#22405b;
  --black-deep:#0f2638;
  --white:#ffffff;
  --off-white:var(--tint);
  --crimson:var(--blue);
  --crimson-h:var(--blue-h);
  --teal:var(--blue-2);
  --teal-h:#3a7bad;
  --body-text:var(--body);
  --border:var(--line);
  --border-dk:var(--line);
  --divider:#edf1f6;

  /* type */
  --font-sans:"Noto Sans JP",system-ui,-apple-system,"Hiragino Kaku Gothic ProN",Meiryo,sans-serif;
  --font-display:"Noto Sans JP",system-ui,sans-serif;
  --font-serif:var(--font-display);
  --font-data:"Inter","Noto Sans JP",sans-serif;

  /* shape & motion — subtle radius, flat */
  --radius:10px;
  --radius-sm:8px;
  --radius-lg:12px;
  --shadow-sm:0 1px 2px rgba(22,49,74,.05);
  --shadow-md:0 8px 26px rgba(22,49,74,.08);
  --transition:.22s ease;
  --container:1200px;
  --section-py:clamp(52px,6vw,88px);
}

/* ---------- Reset / base ---------- */
*,*::before,*::after{box-sizing:border-box}
*{margin:0;padding:0}
html{font-size:17px;-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--font-sans);font-weight:400;font-size:1.02rem;line-height:1.95;
  color:var(--body);background:var(--paper);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea,select{font:inherit;color:inherit}
::selection{background:var(--blue);color:#fff}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--ink);font-weight:700;line-height:1.45;letter-spacing:.005em}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 28px}

/* ---------- Sections ---------- */
.section{padding:var(--section-py) 0;position:relative}
.section-light{background:var(--tint)}
.section-tint{background:var(--blue-soft-2)}
.section-strengths{background:var(--paper)}

/* ---------- Section header (left, clear hierarchy) ---------- */
.section-header{max-width:none;margin:0 0 clamp(28px,4vw,44px)}
.section-label{
  font-family:var(--font-data);font-size:.8rem;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;color:var(--blue);
  display:inline-flex;align-items:center;gap:10px;margin-bottom:14px;
}
.section-label::before{content:"";width:22px;height:3px;background:var(--blue)}
.section-title{font-size:clamp(1.85rem,3.4vw,2.45rem);letter-spacing:-.005em;color:var(--ink);font-weight:700}
.section-desc{margin-top:16px;max-width:860px;font-size:1.05rem;line-height:1.95;color:var(--body)}
.section-header[style*="center"] .section-label{justify-content:center}

/* ---------- Buttons (flat, subtle radius) ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:14px 28px;border-radius:var(--radius-sm);font-weight:700;font-size:1rem;
  transition:background var(--transition),color var(--transition),border-color var(--transition)}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-h)}
.btn-outline{background:#fff;color:var(--blue);border:1.5px solid var(--blue)}
.btn-outline:hover{background:var(--blue-soft)}
.btn-large{padding:16px 36px}

/* ---------- Header ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(255,255,255,.92);backdrop-filter:saturate(160%) blur(10px);-webkit-backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);transition:box-shadow var(--transition)}
.site-header.scrolled{box-shadow:0 2px 16px rgba(22,49,74,.07)}
.header-inner{max-width:1300px;margin:0 auto;padding:0 28px;height:78px;display:flex;align-items:center;justify-content:space-between}
.header-logo{display:flex;align-items:center;gap:12px}
.logo-mark{width:44px;height:44px;border-radius:9px;flex:none;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-display);font-weight:700;font-size:1.3rem;color:#fff;background:var(--blue)}
.logo-img{width:44px;height:44px;border-radius:8px;object-fit:cover}
.logo-text{display:flex;flex-direction:column;line-height:1.18}
.logo-name{font-family:var(--font-display);font-weight:700;font-size:1.1rem;color:var(--ink)}
.logo-sub{font-family:var(--font-data);font-size:.62rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}
.header-nav ul{display:flex;align-items:center;gap:2px}
.header-nav a{display:inline-block;padding:9px 13px;border-radius:6px;font-size:.96rem;font-weight:500;color:var(--ink);transition:color var(--transition),background var(--transition)}
.header-nav a:hover{color:var(--blue);background:var(--blue-soft)}
.header-nav .nav-cta{background:var(--blue);color:#fff;padding:10px 20px;margin-left:8px;border-radius:var(--radius-sm)}
.header-nav .nav-cta:hover{background:var(--blue-h);color:#fff}
/* 言語スイッチャー（ドロップダウン：JA既定→KO/ENが下に展開） */
.lang-switcher{position:relative;margin-left:8px}
.lang-switcher>summary{list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:5px;font-family:var(--font-data);font-size:.74rem;font-weight:700;letter-spacing:.02em;padding:7px 11px;border-radius:6px;background:var(--blue);color:#fff;border:1px solid var(--blue);user-select:none;white-space:nowrap}
.lang-switcher>summary::-webkit-details-marker{display:none}
.lang-switcher>summary::after{content:"\25BE";font-size:.85em;opacity:.9}
.lang-switcher[open]>summary::after{content:"\25B4"}
.lang-menu{position:absolute;top:calc(100% + 6px);right:0;min-width:150px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 10px 28px rgba(16,49,74,.14);padding:6px;z-index:1100;display:flex;flex-direction:column;gap:2px}
.lang-switcher .lang-opt{display:flex;align-items:center;gap:8px;padding:9px 12px;border-radius:6px;font-size:.85rem;font-weight:500;color:var(--body);background:none;text-decoration:none;white-space:nowrap}
.lang-switcher .lang-opt:hover{background:var(--blue-soft);color:var(--blue)}
.lang-switcher .lang-opt.active{color:var(--blue);font-weight:700}
.hamburger{display:none;width:46px;height:46px;border-radius:8px;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.hamburger span{width:23px;height:2px;background:var(--ink);border-radius:2px;transition:transform .25s ease,opacity .25s ease}
.hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- Hero (2-col: message + photo & data) ---------- */
.hero{position:relative;padding:clamp(132px,15vh,168px) 0 clamp(64px,7vw,96px);background:linear-gradient(180deg,var(--blue-soft-2),#fff 72%);border-bottom:1px solid var(--line)}
.hero-inner{max-width:var(--container);margin:0 auto;padding:0 28px;display:grid;grid-template-columns:1.04fr .96fr;gap:clamp(36px,5vw,64px);align-items:center}
.hero-content{text-align:left}
.hero-eyebrow{display:inline-flex;align-items:center;gap:11px;margin-bottom:22px;
  font-family:var(--font-data);font-size:.82rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--blue)}
.eyebrow-line{width:30px;height:2px;background:var(--blue)}
.hero-title{font-size:clamp(2.2rem,4.6vw,3.4rem);line-height:1.34;letter-spacing:-.005em;color:var(--ink);margin-bottom:24px;font-weight:700}
.hero-title-line{display:block;opacity:0;animation:fadeIn .6s ease forwards}
.hero-subtitle{max-width:560px;font-size:1.1rem;line-height:1.95;color:var(--body)}
.hero-actions{display:flex;gap:13px;flex-wrap:wrap;margin-top:30px}
.hero-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:30px}
.hero-tags span{font-family:var(--font-data);font-size:.8rem;font-weight:500;padding:6px 13px;border-radius:6px;background:#fff;border:1px solid var(--line);color:var(--blue)}
@keyframes fadeIn{to{opacity:1}}

.hero-visual{display:flex;flex-direction:column;gap:14px}
.hero-photo{border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;background:var(--blue-soft);aspect-ratio:4/3}
.hero-photo img{width:100%;height:100%;object-fit:cover}
.hero-photo-ph{height:100%;min-height:260px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:var(--blue-2);text-align:center;padding:24px}
.hero-photo-ph svg{width:54px;height:54px;opacity:.7}
.hero-photo-ph span{font-size:.86rem;color:var(--muted)}
.hero-data{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.hero-data>div{padding:18px 14px;text-align:center;border-right:1px solid var(--line)}
.hero-data>div:last-child{border-right:none}
.hero-data dt{font-size:.74rem;color:var(--muted);margin-bottom:6px}
.hero-data dd{font-family:var(--font-data);color:var(--ink);display:flex;align-items:baseline;justify-content:center;gap:2px}
.hero-data dd b{font-size:1.5rem;font-weight:700;color:var(--blue);letter-spacing:-.01em}
.hero-data dd span{font-size:.82rem;color:var(--muted)}

/* ---------- Fields band (static, informative) ---------- */
.fields-band{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:26px 0}
.fields-band .container{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.fields-label{font-family:var(--font-data);font-size:.76rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);flex:none}
.fields-list{display:flex;flex-wrap:wrap;gap:8px}
.fields-list li{font-size:.86rem;color:var(--ink);padding:6px 13px;border:1px solid var(--line);border-radius:6px;background:var(--tint-2)}

/* ---------- Strengths ---------- */
.strengths-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.strength-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:32px 26px;transition:box-shadow var(--transition),border-color var(--transition)}
.strength-card:hover{box-shadow:var(--shadow-md);border-color:var(--blue-2)}
.strength-icon{width:54px;height:54px;border-radius:9px;display:flex;align-items:center;justify-content:center;background:var(--blue-soft);color:var(--blue);margin-bottom:18px}
.strength-icon svg{width:28px;height:28px}
.strength-card h3{font-size:1.16rem;margin-bottom:11px;color:var(--ink);line-height:1.5}
.strength-card p{font-size:.95rem;line-height:1.85;color:var(--body)}

/* ---------- Services ---------- */
.services-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.service-card{position:relative;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:34px;transition:box-shadow var(--transition),border-color var(--transition)}
.service-card:hover{box-shadow:var(--shadow-md);border-color:var(--blue-2)}
.service-icon{width:54px;height:54px;border-radius:9px;display:flex;align-items:center;justify-content:center;background:var(--blue-soft);color:var(--blue);margin-bottom:18px}
.service-icon svg{width:27px;height:27px}
.service-badge{position:absolute;top:30px;right:30px;font-family:var(--font-data);font-size:.7rem;font-weight:600;letter-spacing:.06em;color:var(--blue);background:var(--blue-soft);padding:5px 11px;border-radius:6px}
.service-title{font-size:1.26rem;margin-bottom:6px;color:var(--ink);line-height:1.5}
.service-subtitle{font-family:var(--font-data);font-size:.82rem;font-weight:600;letter-spacing:.04em;color:var(--blue-2);margin-bottom:14px}
.service-desc{font-size:.98rem;line-height:1.9;color:var(--body)}
.service-features{margin-top:18px;padding-top:18px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:9px}
.service-features li{position:relative;padding-left:26px;font-size:.93rem;color:var(--body)}
.service-features li::before{content:"";position:absolute;left:2px;top:.55em;width:12px;height:12px;border-radius:50%;border:3px solid var(--blue);background:#fff}

/* ---------- Products (reuses .llm-* — flat light cards) ---------- */
.llm-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.llm-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:box-shadow var(--transition),border-color var(--transition)}
.llm-thumb{display:flex;align-items:center;justify-content:center;height:140px;margin:-4px 0 16px;border-radius:var(--radius-sm);background:var(--blue-soft-2);border:1px solid var(--line)}
.llm-thumb img{max-width:78%;max-height:78%;width:auto;height:auto;object-fit:contain;mix-blend-mode:multiply}
.llm-card:hover{box-shadow:var(--shadow-md);border-color:var(--blue-2)}
.llm-header{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;margin-bottom:12px}
.llm-category{display:inline-block;font-family:var(--font-data);font-size:.66rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--blue);background:var(--blue-soft);padding:4px 10px;border-radius:5px;margin-bottom:10px}
.llm-name{font-family:var(--font-data);font-size:1.28rem;font-weight:600;color:var(--ink)}
.llm-provider{display:block;font-size:.82rem;color:var(--muted);margin-top:2px}
.llm-context{text-align:right;flex:none}
.context-label{display:block;font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.context-value{font-family:var(--font-data);font-size:.92rem;color:var(--blue)}
.llm-desc{font-size:.93rem;line-height:1.85;color:var(--body)}
.llm-features{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}
.llm-tag{font-size:.74rem;padding:4px 11px;border-radius:5px;background:var(--blue-soft);color:var(--blue)}
.llm-usecases{margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}
.usecases-label{font-family:var(--font-data);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:5px}
.llm-usecases p{font-size:.88rem;color:var(--body)}
.products-note{max-width:760px;margin:32px auto 0;padding:16px 20px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--tint-2);font-size:.86rem;line-height:1.8;color:var(--muted);text-align:left}

/* ---------- About ---------- */
.about-layout{display:grid;grid-template-columns:1.02fr .98fr;gap:clamp(40px,6vw,80px);align-items:start}
.about-layout--reverse{direction:rtl}
.about-layout--reverse>*{direction:ltr}
.about-dynamic-block{margin-bottom:60px}
.about-dynamic-block--divider{margin-top:60px;padding-top:60px;border-top:1px solid var(--line)}
.about-body{font-size:1.02rem;line-height:2.05;color:var(--body);margin-top:16px}
.about-dynamic-image img,.about-full-image img{border-radius:var(--radius);border:1px solid var(--line);width:100%}
.about-full-image{margin:24px 0}
.about-link-wrap{margin-top:22px}
.about-link{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-weight:600;font-size:.98rem}
.about-link::after{content:"→";transition:transform var(--transition)}
.about-link:hover::after{transform:translateX(4px)}
.company-info-table{margin-top:26px}
.company-info-table dl{border-top:1px solid var(--line)}
.company-info-table dl>div{display:flex;gap:18px;padding:15px 6px;border-bottom:1px solid var(--line)}
.company-info-table dt{flex:none;width:128px;font-weight:600;color:var(--ink);font-size:.95rem}
.company-info-table dd{color:var(--body);font-size:.96rem}

/* data panels (measurement-style readout) */
.about-numbers{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.about-map{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;background:var(--tint)}
.about-map iframe{width:100%;height:100%;border:0;display:block}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;text-align:left}
.stat-num{font-family:var(--font-data);font-size:clamp(2rem,4.4vw,2.7rem);font-weight:700;color:var(--blue);line-height:1;display:inline-flex;align-items:baseline}
.stat-unit{font-size:1rem;margin-left:3px;color:var(--muted)}
.stat-label{display:block;margin-top:12px;font-size:.88rem;color:var(--muted);padding-top:12px;border-top:1px solid var(--line)}
.about-accent-box{margin-top:24px;padding:26px;border-radius:var(--radius);background:var(--blue-soft);border:1px solid var(--line);color:var(--ink)}
.about-accent-box blockquote{font-size:1.02rem;line-height:1.85;color:var(--ink)}
.about-accent-box cite{display:block;margin-top:12px;font-style:normal;font-size:.86rem;color:var(--blue)}

/* ---------- News ---------- */
.news-list{max-width:880px;margin:0 auto;display:flex;flex-direction:column}
.news-item a{display:flex;align-items:center;gap:20px;padding:22px 14px;border-bottom:1px solid var(--line);transition:background var(--transition)}
.news-item a:hover{background:var(--tint)}
.news-meta{display:flex;align-items:center;gap:14px;flex:none}
.news-date{font-family:var(--font-data);font-size:.86rem;color:var(--muted)}
.news-cat{font-size:.74rem;padding:4px 10px;border-radius:5px;background:var(--blue-soft);color:var(--blue)}
.news-title{flex:1;font-size:1.02rem;font-weight:600;color:var(--ink)}
.news-arrow{color:var(--blue);font-size:1.1rem;transition:transform var(--transition)}
.news-item a:hover .news-arrow{transform:translateX(4px)}

/* ---------- Contact (light, white form card) ---------- */
.section-contact{background:var(--tint);position:relative}
.contact-form{position:relative;z-index:2;max-width:720px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:clamp(26px,4vw,44px)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:.92rem;font-weight:600;color:var(--ink);margin-bottom:8px}
.required{font-size:.7rem;color:#fff;background:var(--blue);padding:2px 8px;border-radius:5px;margin-left:6px}
.contact-form input,.contact-form select,.contact-form textarea{width:100%;padding:13px 15px;border-radius:var(--radius-sm);
  background:#fff;border:1px solid var(--line);color:var(--ink);transition:border-color var(--transition),box-shadow var(--transition)}
.contact-form input::placeholder,.contact-form textarea::placeholder{color:#9aacbe}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(21,99,158,.15)}
.form-submit{margin-top:22px;text-align:center}
.privacy-note{font-size:.88rem;color:var(--muted);margin-bottom:18px}
.privacy-note a{color:var(--blue);text-decoration:underline}
.contact-success{max-width:560px;margin:0 auto;text-align:center;padding:46px 30px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg)}
.contact-success svg{width:54px;height:54px;color:var(--green);margin:0 auto 18px}
.contact-error{max-width:720px;margin:0 auto 20px;padding:14px 18px;border-radius:var(--radius-sm);background:#fdeaea;border:1px solid #f3c4c4;color:#a82220;font-size:.92rem}

/* ---------- FAQ-page CTA panel (flat) ---------- */
.cta-panel{margin-top:54px;padding:clamp(32px,5vw,48px);text-align:center;border-radius:var(--radius-lg);background:var(--tint);border:1px solid var(--line)}
.cta-eyebrow{font-family:var(--font-data);font-size:.76rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--blue);margin-bottom:10px}
.cta-title{font-family:var(--font-display);font-weight:700;font-size:1.4rem;color:var(--ink);margin-bottom:8px}
.cta-text{font-size:1rem;color:var(--muted);margin-bottom:26px}

/* ---------- Footer (light) ---------- */
.site-footer{background:#fff;border-top:1px solid var(--line);color:var(--body)}
.footer-inner{max-width:var(--container);margin:0 auto;padding:64px 28px 30px}
.footer-top{display:grid;grid-template-columns:0.8fr 3.4fr;gap:32px;padding-bottom:40px;border-bottom:1px solid var(--line)}
.footer-logo{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.footer-logo .logo-name{color:var(--ink)}
.footer-tagline{font-size:.92rem;line-height:1.8;color:var(--muted);max-width:340px}
.footer-social{display:flex;gap:10px;margin-top:18px}
.footer-social-link{width:38px;height:38px;border-radius:8px;display:flex;align-items:center;justify-content:center;background:var(--tint);border:1px solid var(--line);color:var(--blue);transition:background var(--transition),color var(--transition)}
.footer-social-link:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.footer-nav{display:grid;grid-template-columns:2.4fr 1fr 1.5fr;gap:22px}
.footer-nav-head{font-family:var(--font-data);font-size:.76rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--ink);margin-bottom:15px}
.footer-nav-col ul{display:flex;flex-direction:column;gap:11px}
.footer-nav-col a,.footer-nav-col li{font-size:.86rem;line-height:1.55;color:var(--muted);transition:color var(--transition)}
.footer-nav-col a:hover{color:var(--blue)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;padding-top:24px;font-size:.86rem;color:var(--muted)}
.footer-bottom a{color:var(--muted)}
.footer-bottom a:hover{color:var(--blue)}

/* ---------- Back to top ---------- */
.back-to-top{position:fixed;right:28px;bottom:28px;z-index:1100;width:48px;height:48px;border-radius:9px;display:flex;align-items:center;justify-content:center;
  background:var(--blue);color:#fff;opacity:0;visibility:hidden;transition:opacity var(--transition),background var(--transition)}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{background:var(--blue-h)}
.back-to-top svg{width:22px;height:22px}

/* ---------- AOS reveal (subtle, calm) ---------- */
[data-aos]{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
[data-aos].aos-visible{opacity:1;transform:none}

/* ---------- Static pages ---------- */
.faq-hero,.static-page-header{padding:clamp(128px,15vh,168px) 0 clamp(46px,6vw,68px);background:var(--tint);text-align:center;border-bottom:1px solid var(--line)}
.faq-hero h1,.static-page-header h1{font-size:clamp(2rem,4.2vw,2.9rem);color:var(--ink)}
.faq-desc,.static-page-header p{max-width:640px;margin:14px auto 0;color:var(--muted);font-size:1.02rem;line-height:1.9}
.faq-notice{max-width:760px;margin:24px auto 0;padding:16px 22px;border-radius:var(--radius-sm);background:var(--blue-soft);border:1px solid #cfe0f0;color:var(--body);font-size:.92rem}
.faq-content,.static-page-content{padding:clamp(54px,7vw,88px) 0}
.static-page,.static-page-content{color:var(--body)}
.static-page-content .container{max-width:860px}
.static-page-content h2{font-size:1.4rem;margin:42px 0 16px;color:var(--ink)}
.static-page-content h3{font-size:1.12rem;margin:28px 0 12px;color:var(--ink)}
.static-page-content p,.static-page-content li{font-size:1rem;line-height:1.95;color:var(--body);margin-bottom:12px}
.static-page-content ul{padding-left:22px;list-style:disc}
.static-page-content a{color:var(--blue);text-decoration:underline}
.page-back-link{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-weight:600;font-size:.92rem;margin-bottom:30px}
.page-back-link::before{content:"←"}
.page-date{font-family:var(--font-data);font-size:.86rem;color:var(--muted);margin-bottom:8px}
.faq-group{margin-bottom:38px}
.faq-group-title{font-size:1.24rem;color:var(--ink);margin-bottom:16px;padding-bottom:11px;position:relative}
.faq-group-title::after{content:"";position:absolute;left:0;bottom:0;width:44px;height:3px;background:var(--blue)}
.faq-item{border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:11px;background:var(--paper);overflow:hidden;transition:border-color var(--transition)}
.faq-item[open]{border-color:var(--blue-2)}
.faq-question{list-style:none;cursor:pointer;padding:20px 24px;font-weight:600;color:var(--ink);font-size:1.04rem;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-question::-webkit-details-marker{display:none}
.faq-question::after{content:"+";font-family:var(--font-data);font-size:1.4rem;color:var(--blue);transition:transform var(--transition);flex:none}
.faq-item[open] .faq-question::after{transform:rotate(45deg)}
.faq-answer{padding:0 24px 22px;color:var(--body);line-height:1.95;font-size:.98rem}

/* ---------- Responsive ---------- */
@media (max-width:980px){
  .hero-inner{grid-template-columns:1fr;gap:34px}
  .hero-visual{max-width:520px}
  .strengths-grid{grid-template-columns:repeat(2,1fr)}
  .llm-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:860px){
  .hamburger{display:flex}
  .header-nav{position:fixed;inset:0;background:rgba(255,255,255,.99);display:flex;flex-direction:column;justify-content:center;align-items:center;gap:6px;opacity:0;visibility:hidden;transform:translateY(-10px);transition:opacity .25s ease,transform .25s ease,visibility .25s}
  .header-nav.open{opacity:1;visibility:visible;transform:none}
  .header-nav ul{flex-direction:column;gap:4px;width:100%;max-width:320px;padding:0 24px}
  .header-nav li{width:100%}
  .header-nav a{display:block;text-align:center;padding:15px;font-size:1.1rem;width:100%}
  .header-nav .nav-cta{margin:8px 0 0}
  .lang-switcher{margin:14px 0 0;width:100%;display:flex;flex-direction:column;align-items:center}
  .lang-switcher>summary{justify-content:center;min-width:140px}
  .lang-menu{position:static;right:auto;min-width:160px;box-shadow:none;margin-top:8px;border-color:var(--line)}
  .about-layout{grid-template-columns:1fr;gap:34px}
  .footer-top{grid-template-columns:1fr;gap:32px}
  .about-layout--reverse{direction:ltr}
}
@media (max-width:680px){
  .strengths-grid,.services-grid,.llm-grid,.about-numbers{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:1fr 1fr}
  .container{padding:0 20px}
  .news-item a{flex-wrap:wrap;gap:10px}
  .fields-band .container{flex-direction:column;align-items:flex-start;gap:12px}
}

/* ---------- A11y ---------- */
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:3px}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .hero-title-line{opacity:1!important}
  [data-aos]{opacity:1!important;transform:none!important}
}
.goog-te-banner-frame,.skiptranslate{display:none!important}
body{top:0!important}
.goog-te-gadget{font-size:0!important}

/* ============================================================
   主張文言・用語の区別ブロック（検索/AI最適化用の可視セクション）
   helpers.php renderClaimsBlock() / faq.php 検索結果 で使用
   ============================================================ */
.section-claims{background:var(--blue-soft-2)}
.claims-list{list-style:none;margin:8px 0 0;padding:0;display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}
.claims-list li{position:relative;padding:14px 16px 14px 40px;background:#fff;
  border:1px solid var(--line);border-radius:10px;color:var(--ink);font-weight:600;line-height:1.6}
.claims-list li::before{content:"";position:absolute;left:16px;top:18px;width:14px;height:8px;
  border-left:2.5px solid var(--blue);border-bottom:2.5px solid var(--blue);transform:rotate(-45deg)}
.disambig-grid{margin-top:20px;display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.disambig-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 22px}
.disambig-card h3{font-size:1.05rem;margin:0 0 8px;color:var(--blue);
  padding-bottom:8px;border-bottom:1px solid var(--line)}
.disambig-card p{margin:0;color:var(--muted);line-height:1.85;font-size:.95rem}

/* オンサイト検索（faq.php） */
.site-search{max-width:860px;margin:0 auto 28px;display:flex;gap:8px}
.site-search input[type="search"]{flex:1;padding:12px 16px;border:1.5px solid var(--line);
  border-radius:10px;font-size:1rem;color:var(--ink);background:#fff}
.site-search input[type="search"]:focus{outline:none;border-color:var(--blue);
  box-shadow:0 0 0 3px var(--blue-soft)}
.site-search button{padding:12px 22px;border:none;border-radius:10px;background:var(--blue);
  color:#fff;font-weight:600;cursor:pointer}
.site-search button:hover{background:var(--blue-h)}
.search-summary{max-width:860px;margin:0 auto 16px;color:var(--muted);font-size:.95rem}
.search-results{max-width:860px;margin:0 auto 36px;display:grid;gap:12px}
.search-result{display:block;padding:16px 18px;background:#fff;border:1px solid var(--line);
  border-radius:10px;text-decoration:none;color:inherit;transition:box-shadow var(--transition)}
.search-result:hover{box-shadow:0 4px 18px rgba(21,99,158,.10)}
.search-result .sr-cat{font-family:var(--font-data);font-size:.68rem;font-weight:700;
  letter-spacing:.12em;text-transform:uppercase;color:var(--blue)}
.search-result h3{font-size:1.05rem;margin:4px 0 6px;color:var(--ink)}
.search-result p{margin:0;color:var(--muted);line-height:1.7;font-size:.93rem}
.search-result mark{background:var(--blue-soft);color:var(--blue-h);padding:0 2px;border-radius:3px}
.search-empty{max-width:860px;margin:0 auto 36px;padding:40px;text-align:center;
  color:var(--muted);border:1px dashed var(--line);border-radius:12px}

/* ============================================================
   キーワード別ランディングページ（lp.php）
   ============================================================ */
.lp-breadcrumb{font-size:.82rem;color:var(--muted);margin-bottom:14px}
.lp-breadcrumb a{color:var(--blue);text-decoration:none}
.lp-breadcrumb a:hover{text-decoration:underline}
.lp-breadcrumb span{margin:0 6px;color:var(--line)}
.lp-title{font-size:clamp(1.8rem,3.6vw,2.6rem);color:var(--ink);font-weight:800;margin:6px 0 16px;line-height:1.4}
.lp-lead{font-size:1.05rem;line-height:1.95;color:var(--body,var(--muted));max-width:760px}
.lp-content{padding:56px 0 72px}
.lp-section{margin-bottom:40px}
.lp-section h2{font-size:1.35rem;color:var(--ink);font-weight:700;margin:0 0 14px;
  padding-bottom:10px;border-bottom:2px solid var(--blue-soft)}
.lp-section > p{font-size:1rem;line-height:2;color:var(--body,#4a5b6b);margin:0}
.lp-section .faq-item{margin-top:10px}
.lp-related{margin:8px 0 40px;padding:22px 24px;background:var(--blue-soft-2);border:1px solid var(--line);border-radius:12px}
.lp-related-label{font-family:var(--font-data);font-size:.72rem;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--blue);margin:0 0 12px}
.lp-related ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:10px 22px}
.lp-related a{color:var(--ink);text-decoration:none;font-weight:600}
.lp-related a:hover{color:var(--blue)}
.lp-related a span{color:var(--blue)}

/* トップの「キーワード別ご案内」バンド */
.keyword-band{padding:0 0 8px}
.keyword-band .kw-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}
.kw-card{display:block;padding:20px 22px;background:#fff;border:1px solid var(--line);border-radius:12px;
  text-decoration:none;color:inherit;transition:box-shadow var(--transition),transform var(--transition)}
.kw-card:hover{box-shadow:0 8px 26px rgba(21,99,158,.10);transform:translateY(-2px)}
.kw-card .kw-key{font-size:1.05rem;font-weight:700;color:var(--ink)}
.kw-card .kw-sub{display:block;margin-top:6px;font-size:.9rem;color:var(--muted);line-height:1.7}
.kw-card .kw-arrow{color:var(--blue);font-weight:700}