/* =========================================================
   Design System for Business Efficiency Theme (Full)
   - Desktop: 常時表示ナビ
   - Mobile : 上からスライドするトップシート＋暗幕
========================================================= */

/* ---------- Design Tokens ---------- */
:root{
  --bg:#f8f9fa; --surface:#fff; --surface-muted:#f1f3f5;
  --text:#212529; --text-muted:#6c757d; --border:#dee2e6;
  --accent:#007bff; --accent-600:#0069d9; --accent-700:#005cbf;
  --cta:#28a745; --cta-hover:#218838; --focus:#007bff;

  --radius:12px; --radius-sm:8px;
  --shadow-sm:0 2px 8px rgba(0,0,0,.05);
  --shadow-md:0 6px 20px rgba(0,0,0,.07);

  --space-2:.5rem; --space-3:.75rem; --space-4:1rem; --space-5:1.25rem;
  --space-6:1.5rem; --space-8:2rem; --space-10:2.5rem; --space-12:3rem;

  --section:clamp(64px,10vw,100px);
  --container:1140px;
}

/* ---------- Reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family:"Noto Sans JP",system-ui,-apple-system,"Segoe UI",Roboto,"Hiragino Sans","Meiryo",sans-serif;
  line-height:1.7; letter-spacing:.02em; color:var(--text); background:var(--bg);
  text-rendering:optimizeLegibility; -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; height:auto; }
a{ color:var(--accent); text-decoration:none; }
a:hover{ text-decoration:underline; text-underline-offset:4px; }
:focus-visible{ outline:3px solid var(--focus); outline-offset:3px; border-radius:var(--radius-sm); }

/* ---------- Utilities ---------- */
.container{ width:min(100% - 32px,var(--container)); margin-inline:auto; }
.center{ text-align:center; }
.m-top-24{ margin-top:24px; }
.surface-muted{ background:var(--surface-muted); }
.note-strong{ font-weight:700; }
.br-lg{ display:none; }
@media (min-width: 960px){ .br-lg{ display:inline; } }
.no-bullet{ list-style:none; padding-left:0; margin:0; }

/* ---------- Sections ---------- */
.section{ padding-block:var(--section); }
.section__title{
  font-weight:800; font-size:clamp(1.6rem,2.5vw,2.4rem); line-height:1.3;
  text-align:center; margin:0 0 var(--space-8);
}
.eyebrow{
  display:inline-block; font-weight:700; font-size:.9rem; letter-spacing:.08em;
  color:var(--accent-700); background:rgba(0,123,255,.08);
  padding:8px 14px; border-radius:999px; margin:0 auto 16px; text-align:center;
}
.lead{ color:var(--text); font-size:clamp(1.05rem,1.6vw,1.15rem); }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:.5em;
  border-radius:999px; font-weight:700; line-height:1;
  border:1px solid transparent; box-shadow:var(--shadow-sm);
  transition:transform .2s, box-shadow .2s, background-color .2s, border-color .2s;
  padding:.9rem 1.2rem; white-space:nowrap;
}
.btn:hover{ transform:translateY(-2px); text-decoration:none; box-shadow:var(--shadow-md); }
.btn--primary{ background:var(--accent); color:#fff; border-color:var(--accent); }
.btn--primary:hover{ background:var(--accent-600); border-color:var(--accent-600); }
.btn--cta{ background:var(--cta); color:#fff; border-color:var(--cta); }
.btn--cta:hover{ background:var(--cta-hover); border-color:var(--cta-hover); }
.btn--ghost{ background:transparent; border-color:var(--border); box-shadow:none; }
.btn--ghost:hover{ border-color:var(--text-muted); background:var(--surface); }
.btn--xl{ padding:1.1rem 1.5rem; font-size:clamp(1.05rem,1.5vw,1.1rem); }
.btn--lg{ padding:1rem 1.3rem; }
.btn--sm{ padding:.7rem .9rem; font-size:.9rem; }

/* ---------- Card ---------- */
.card{
  background:var(--surface); border-radius:var(--radius);
  box-shadow:var(--shadow-sm); padding:clamp(20px,2.2vw,32px);
  border:1px solid var(--border);
  transition:transform .2s, box-shadow .2s;
}
.card:hover{ box-shadow:var(--shadow-md); transform:translateY(-4px); }
.card .card__title{ margin:0 0 12px; font-size:1.2rem; }

/* ---------- Header / Nav (Desktop base) ---------- */
.skip-link{ position:absolute; left:-999px; top:-999px; }
.skip-link:focus{ left:16px; top:16px; z-index:10000; background:#fff; padding:10px 14px; border-radius:8px; }

.site-header{
  position:sticky; top:0;
  background:rgba(255,255,255,.8);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--border);
  z-index:2050; /* 高めに */
}
.site-header.is-scrolled{ box-shadow:0 4px 20px rgba(0,0,0,.06); }

.header-inner{ display:flex; align-items:center; justify-content:space-between; padding-block:14px; gap:12px; }
.brand__logo{ height:22px; width:auto; }

.nav{ position:static; }
.nav__list{ margin:0; padding:0; list-style:none; display:flex; align-items:center; gap:12px; }
.nav__list a{
  padding:8px 12px; border-radius:var(--radius-sm);
  font-weight:600; color:var(--text-muted);
  transition:background-color .2s, color .2s;
}
.nav__list a:hover, .nav__list a.active{
  background:var(--surface-muted); color:var(--text); text-decoration:none;
}

/* ---------- Backdrop (for mobile) ---------- */
.nav-backdrop{
  position:fixed; inset:0;
  background:rgba(0,0,0,.45);
  opacity:0; pointer-events:none;
  transition:opacity .25s ease;
  z-index:2000; /* ナビ（2025）より下、本文より上 */
}
body.nav-open .nav-backdrop{ opacity:1; pointer-events:auto; }

/* ---------- Desktop behavior ---------- */
@media (min-width: 769px){
  .nav-toggle{ display:none; }
  .nav{
    position:static !important; transform:none !important; pointer-events:auto !important;
    width:auto !important; box-shadow:none !important; padding:0 !important; border:0 !important;
  }
  .nav__list{ display:flex; gap:12px; }
}

/* ---------- Mobile: Top-sheet (slide-down) ---------- */
.nav-toggle{ display:none; }
@media (max-width: 768px){
  .nav-toggle{
    display:grid; place-items:center;
    width:44px; height:44px;
    border:1px solid var(--border); border-radius:10px; background:var(--surface);
    box-shadow:var(--shadow-sm);
    z-index:2100; /* トグル最前面 */
  }
  .nav-toggle__bar{
    width:22px; height:2px; background:var(--text);
    position:relative; transition:background-color .2s;
  }
  .nav-toggle__bar::before, .nav-toggle__bar::after{
    content:""; position:absolute; left:0; width:22px; height:2px; background:var(--text); transition:transform .2s;
  }
  .nav-toggle__bar::before{ transform:translateY(-6px); }
  .nav-toggle__bar::after { transform:translateY( 6px); }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar{ background:transparent; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar::before{ transform:translateY(0) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar::after { transform:translateY(0) rotate(-45deg); }

  /* サイドドロワーではなく上から全幅でスライドイン */
  .site-header .nav{
    position:fixed !important;
    left:0 !important; right:0 !important; top:0 !important; bottom:auto !important;
    width:100vw !important; max-width:100vw !important;
    height:100dvh; /* iOSにも強い */
    background:#fff;
    border:0; border-bottom:1px solid var(--border);
    box-shadow:0 12px 30px rgba(0,0,0,.12);
    padding:80px 20px 24px; /* ロゴ/トグルと干渉しない上余白 */
    transform:translateY(-100%) !important; /* 初期は上に隠す */
    transition:transform .33s cubic-bezier(.2,.7,.2,1);
    pointer-events:none !important;
    z-index:2025 !important; /* ヘッダ下、暗幕上 */
    overflow:auto; border-radius:0;
  }
  .site-header .nav[data-open="true"]{
    transform:translateY(0) !important;
    pointer-events:auto !important;
  }

  .site-header .nav__list{
    margin:0; padding:0; list-style:none;
    display:flex; flex-direction:column; gap:10px; align-items:stretch;
  }
  .site-header .nav__list a{
    display:block; width:100%;
    font-size:1.15rem; padding:14px 4px;
    border-bottom:1px solid var(--surface-muted); border-radius:0;
  }

  body.nav-open{ overflow:hidden; } /* 背面スクロール禁止 */
}

/* ---------- Hero ---------- */
.hero{ background:var(--surface); border-bottom:1px solid var(--border); text-align:center; }
@media (min-width:980px){
  .hero{ text-align:left; }
  .hero__grid{ display:grid; gap:clamp(32px,4vw,64px); align-items:center; grid-template-columns:1fr 1fr; }
}
.hero__title{
  margin:var(--space-4) 0 var(--space-6);
  font-weight:800; font-size:clamp(2.2rem,4.5vw,3.2rem); line-height:1.25;
}
.accent{ color:var(--accent); background:none; }
.hero__cta{ display:flex; gap:12px; flex-wrap:wrap; margin-top:var(--space-8); }
@media (max-width:979px){
  .hero__content{ max-width:680px; margin-inline:auto; }
  .hero__cta{ justify-content:center; }
  .hero__aside{ margin-top:var(--space-8); }
}
.mockup-stack{ position:relative; width:min(100%,520px); margin-inline:auto; }
.mockup-pc{ width:100%; height:auto; border-radius:var(--radius); box-shadow:var(--shadow-md); border:1px solid var(--border); display:block; }

/* ---------- Lists ---------- */
.bullet-list{ margin:0; padding:0; list-style:none; display:grid; gap:12px; }
.bullet-list li{ padding-left:1.8em; position:relative; }
.bullet-list li::before{ content:"✓"; position:absolute; left:.5em; top:.1em; color:var(--cta); font-weight:900; }

.check-grid{
  margin:var(--space-6) 0 0; padding:0; list-style:none;
  display:grid; gap:16px; grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
}
.check-grid li{ position:relative; padding-left:2em; font-size:1.05rem; }
.check-grid li::before{ content:"✓"; position:absolute; left:0; top:.1em; color:var(--cta); font-weight:900; font-size:1.2em; }

/* ---------- Cards grid ---------- */
.cards{ display:grid; gap:clamp(16px,2.2vw,28px); }
.cards--3{ grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); }
.cards--2{ grid-template-columns:repeat(auto-fit,minmax(320px,1fr)); }
.card__title{ margin:0 0 10px; font-weight:700; font-size:1.2rem; }
.card__text{ margin:0; color:var(--text-muted); }

/* ---------- Contact & Footer ---------- */
#contact.section{ background:var(--surface); }
#contact .hero__cta{ justify-content:center; }
.site-footer{ padding-block:32px; background:var(--text); color:#fff; text-align:center; }
.footer-inner{ opacity:.8; }

/* ---------- Table ---------- */
.table{
  width:100%; border-collapse:collapse; margin-top:var(--space-6);
  font-size:.95rem; box-shadow:var(--shadow-sm);
  border-radius:var(--radius-sm); overflow:hidden; border:1px solid var(--border);
}
.table th,.table td{ padding:12px 16px; text-align:left; border-bottom:1px solid var(--border); }
.table th{ background:var(--surface-muted); font-weight:600; color:var(--text); }
.table tbody tr:last-child td{ border-bottom:none; }
.table tbody tr:hover{ background-color:rgba(0,123,255,.04); }

/* ---------- Optional: bot overlap guard ---------- */
/* #bot{ z-index:800; } */

/* ---------- Chat Widget Customizations ---------- */
#bot.chat--closed #log,
#bot.chat--closed .chat-input-area {
  display: none;
}