:root{
    --paper:#F6F4EC;
    --surface:#FFFFFF;
    --ink:#1E2A25;
    --ink-soft:#5B665F;
    --ink-faint:#8B9189;
    --border:#DAD5C6;
    --border-strong:#C4BEAC;
    --teal:#1F6F5C;
    --teal-dark:#154F41;
    --teal-tint:#E4F0EB;
    --amber:#A6690A;
    --amber-tint:#FBEEDD;
    --red:#A23B2E;
    --red-tint:#FBEAE7;
    --gray-tint:#EFEEE7;
    --radius:10px;
    --shadow:0 1px 2px rgba(30,42,37,0.06);
  }
  *{box-sizing:border-box;}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:'IBM Plex Sans JP','IBM Plex Sans',sans-serif;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  .app-shell{max-width:960px;margin:0 auto;padding:0 20px 80px;display:none;}

  #authScreen{
    min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:40px 20px 60px;gap:56px;
  }
  .auth-layout{
    width:100%;max-width:980px;margin:auto 0;
    display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:center;
  }
  @media (max-width:820px){
    .auth-layout{grid-template-columns:1fr;gap:32px;max-width:440px;}
  }

  .demo-section{width:100%;max-width:820px;}
  .demo-header{text-align:center;margin-bottom:20px;}
  .demo-header h2{
    font-family:'Space Grotesk',sans-serif;font-size:19px;font-weight:600;margin:0 0 8px;color:var(--ink);
  }
  .demo-header p{font-size:13px;color:var(--ink-soft);margin:0;line-height:1.7;}
  .demo-card{
    background:var(--surface);border:1px solid var(--border);border-radius:14px;
    padding:20px 22px 22px;box-shadow:var(--shadow);
  }
  .demo-tabs{display:flex;gap:4px;margin-bottom:18px;border-bottom:1px solid var(--border);flex-wrap:wrap;}
  .demo-tab{
    flex:1;min-width:120px;appearance:none;border:none;background:none;font-family:inherit;font-size:13px;
    font-weight:500;color:var(--ink-soft);padding:9px 4px;cursor:pointer;border-bottom:2px solid transparent;
  }
  .demo-tab.active{color:var(--teal-dark);border-bottom-color:var(--teal);}
  .demo-pane{display:none;}
  .demo-pane.active{display:block;}
  .demo-2col{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start;}
  @media (max-width:600px){.demo-2col{grid-template-columns:1fr;}}
  .demo-footer{
    display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
    margin-top:18px;padding-top:14px;border-top:1px solid var(--border);
  }
  .demo-cta-text{font-size:12.5px;color:var(--ink-soft);}

  .auth-hero{padding:4px 4px 4px 0;}
  .hero-tagline{
    font-family:'Space Grotesk',sans-serif;font-size:21px;font-weight:600;
    line-height:1.5;margin:14px 0 12px;color:var(--ink);
  }
  .hero-lead{font-size:14px;color:var(--ink-soft);line-height:1.8;margin:0 0 20px;}
  .hero-features{list-style:none;margin:0 0 22px;padding:0;display:flex;flex-direction:column;gap:10px;}
  .hero-features li{
    display:flex;align-items:flex-start;gap:9px;font-size:13.5px;color:var(--ink);line-height:1.6;
  }
  .hero-feature-dot{
    flex:none;width:8px;height:8px;border-radius:50%;background:var(--teal);margin-top:6px;
  }
  .ad-slot{
    border:1px dashed var(--border-strong);border-radius:10px;
    padding:16px;text-align:center;font-size:12px;color:var(--ink-faint);
    max-width:320px;
  }

  .auth-card{
    width:100%;max-width:380px;background:var(--surface);border:1px solid var(--border);
    border-radius:14px;padding:28px 26px;box-shadow:var(--shadow);
    justify-self:center;
  }
  .auth-tabs{display:flex;gap:4px;margin:0 0 16px;border-bottom:1px solid var(--border);}
  .auth-tab{
    flex:1;appearance:none;border:none;background:none;font-family:inherit;font-size:13.5px;
    font-weight:500;color:var(--ink-soft);padding:9px 0;cursor:pointer;
    border-bottom:2px solid transparent;
  }
  .auth-tab.active{color:var(--teal-dark);border-bottom-color:var(--teal);}
  .auth-pane{display:none;}
  .auth-pane.active{display:block;}
  .auth-error{
    background:var(--red-tint);color:var(--red);font-size:12.5px;
    padding:8px 12px;border-radius:8px;margin-bottom:12px;
  }
  header.topbar{
    padding:28px 0 0;
    border-bottom:1px solid var(--border);
    margin-bottom:24px;
  }
  .brandrow{display:flex;align-items:center;gap:12px;}
  .flask-icon{flex:none;}
  .brandrow h1{
    font-family:'Space Grotesk',sans-serif;
    font-size:26px;
    font-weight:700;
    letter-spacing:0.01em;
    margin:0;
    color:var(--ink);
  }
  .tagline{
    margin:2px 0 20px 44px;
    color:var(--ink-soft);
    font-size:13px;
    letter-spacing:0.02em;
  }
  nav.tabs{display:flex;gap:4px;}
  nav.tabs button{
    appearance:none;
    border:none;
    background:none;
    font-family:inherit;
    font-size:14px;
    font-weight:500;
    color:var(--ink-soft);
    padding:10px 18px;
    cursor:pointer;
    border-bottom:2px solid transparent;
    transition:color .15s ease, border-color .15s ease;
  }
  nav.tabs button:hover{color:var(--ink);}
  nav.tabs button.active{color:var(--teal-dark);border-bottom-color:var(--teal);}

  section.screen{display:none;padding-top:24px;}
  section.screen.active{display:block;}

  .layout-2col{display:grid;grid-template-columns:1.15fr 1fr;gap:20px;align-items:start;}
  @media (max-width:760px){.layout-2col{grid-template-columns:1fr;}}

  .card{
    background:var(--surface);
    border:1px solid var(--border);
    border-radius:12px;
    padding:18px 20px;
    box-shadow:var(--shadow);
  }
  .card + .card{margin-top:16px;}
  .card h2{
    font-family:'Space Grotesk',sans-serif;
    font-size:15px;
    font-weight:600;
    margin:0 0 14px;
    color:var(--ink);
  }
  .field{margin-bottom:14px;}
  .field label{
    display:block;
    font-size:12.5px;
    color:var(--ink-soft);
    margin-bottom:5px;
    font-weight:500;
  }
  .field input[type=text],
  .field input[type=number],
  .field input[type=date],
  .field select,
  .field textarea{
    width:100%;
    padding:9px 11px;
    border:1px solid var(--border-strong);
    border-radius:8px;
    font-family:inherit;
    font-size:14px;
    background:var(--surface);
    color:var(--ink);
  }
  .field input:focus, .field select:focus, .field textarea:focus{
    outline:none;
    border-color:var(--teal);
    box-shadow:0 0 0 3px var(--teal-tint);
  }
  .row2{display:grid;grid-template-columns:1fr 1fr;gap:12px;}

  .mode-toggle{display:flex;gap:16px;padding:4px 0 2px;}
  .mode-toggle label{
    display:flex;align-items:center;gap:6px;
    font-size:13.5px;color:var(--ink);font-weight:400;
    cursor:pointer;
  }
  .mode-toggle input[type=radio]{width:auto;accent-color:var(--teal);cursor:pointer;}

  .label-color-row{display:flex;gap:8px;flex-wrap:wrap;padding:2px 0;}
  .label-swatch{
    width:26px;height:26px;border-radius:50%;border:1px solid rgba(0,0,0,0.08);
    cursor:pointer;padding:0;box-sizing:border-box;
  }
  .label-swatch.none{
    background:var(--gray-tint);color:var(--ink-faint);font-size:13px;line-height:1;
    display:flex;align-items:center;justify-content:center;border:1px dashed var(--border-strong);
  }
  .label-swatch.selected{outline:2px solid var(--ink);outline-offset:2px;}

  .label-badge{
    display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:500;
    padding:2px 9px;border-radius:20px;border:1px solid var(--border);
    background:var(--surface);color:var(--ink-soft);vertical-align:middle;margin-left:6px;
  }
  .label-dot{width:9px;height:9px;border-radius:50%;flex:none;}

  .btn{
    appearance:none;
    border:1px solid var(--border-strong);
    background:var(--surface);
    color:var(--ink);
    font-family:inherit;
    font-size:13.5px;
    font-weight:500;
    padding:9px 16px;
    border-radius:8px;
    cursor:pointer;
    transition:background .12s ease, transform .05s ease;
  }
  .btn:hover{background:var(--gray-tint);}
  .btn:active{transform:scale(0.98);}
  .btn-primary{background:var(--teal);border-color:var(--teal);color:#fff;}
  .btn-primary:hover{background:var(--teal-dark);}
  .btn-primary:disabled{background:var(--border-strong);border-color:var(--border-strong);cursor:not-allowed;}
  .btn-ghost{border-color:transparent;}
  .btn-sm{padding:6px 11px;font-size:12.5px;}

  .search-box{position:relative;margin-bottom:12px;}
  .search-box input{
    width:100%;
    padding:9px 11px 9px 32px;
    border:1px solid var(--border-strong);
    border-radius:8px;
    font-family:inherit;
    font-size:14px;
  }
  .search-box svg{position:absolute;left:9px;top:9px;opacity:0.5;}

  .catalog-list{max-height:360px;overflow-y:auto;display:flex;flex-direction:column;gap:6px;padding-right:2px;}
  .catalog-item{
    display:flex;justify-content:space-between;align-items:center;
    padding:10px 12px;
    border:1px solid var(--border);
    border-radius:8px;
    cursor:pointer;
    background:var(--surface);
    transition:border-color .12s ease, background .12s ease;
  }
  .catalog-item:hover{border-color:var(--teal);background:var(--teal-tint);}
  .catalog-item.selected{border-color:var(--teal);background:var(--teal-tint);}
  .catalog-item.depleted{background:#4B4F49;border-color:#3A3E39;color:#D8DAD3;cursor:not-allowed;}
  .catalog-item.depleted:hover{background:#4B4F49;border-color:#3A3E39;}
  .catalog-item.depleted .ci-name{color:#F2F1EA;}
  .catalog-item.depleted .ci-formula{color:#B9BCB4;}
  .catalog-item .ci-name{font-weight:500;font-size:14px;}
  .catalog-item .ci-formula{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--ink-soft);margin-top:1px;}
  .tag{
    display:inline-block;
    font-size:11px;
    font-weight:600;
    padding:3px 8px;
    border-radius:20px;
    white-space:nowrap;
  }
  .tag-danger{background:var(--red-tint);color:var(--red);}
  .tag-amber{background:var(--amber-tint);color:var(--amber);}
  .tag-neutral{background:var(--gray-tint);color:var(--ink-soft);}
  .tag-depleted{background:#4B4F49;color:#fff;}

  .selected-detail{
    border:1px dashed var(--border-strong);
    border-radius:8px;
    padding:12px 14px;
    margin-bottom:14px;
    font-size:13px;
    color:var(--ink-soft);
    min-height:20px;
  }
  .selected-detail .sd-name{font-size:15px;font-weight:600;color:var(--ink);font-family:'IBM Plex Mono',monospace;}
  .selected-detail .sd-note{margin-top:4px;}

  .empty-hint{color:var(--ink-faint);font-size:13px;padding:20px 0;text-align:center;}

  .gauge{
    position:relative;
    height:10px;
    border-radius:5px;
    background:repeating-linear-gradient(90deg,var(--gray-tint) 0 9%, #e6e3d8 9% 10%);
    overflow:hidden;
    border:1px solid var(--border);
  }
  .gauge-fill{height:100%;border-radius:5px 0 0 5px;transition:width .3s ease;}
  .gauge-fill.ok{background:var(--teal);}
  .gauge-fill.low{background:var(--amber);}
  .gauge-fill.critical{background:var(--red);}

  .reg-list{display:flex;flex-direction:column;gap:10px;}
  .reg-card{
    background:var(--surface);
    border:1px solid var(--border);
    border-radius:10px;
    padding:14px 16px;
  }
  .reg-card-top{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;}
  .reg-name{font-weight:600;font-size:15px;}
  .reg-formula{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--ink-soft);}
  .reg-meta{font-size:12px;color:var(--ink-soft);margin-top:6px;}
  .reg-qty{
    font-family:'IBM Plex Mono',monospace;
    font-size:13px;
    text-align:right;
    white-space:nowrap;
  }
  .reg-qty b{font-size:16px;color:var(--ink);}
  .reg-actions{display:flex;gap:6px;margin-top:10px;}

  .history{margin-top:12px;border-top:1px solid var(--border);padding-top:10px;display:none;}
  .history.open{display:block;}
  table.hist-table{width:100%;border-collapse:collapse;font-size:12.5px;}
  table.hist-table th{
    text-align:left;color:var(--ink-soft);font-weight:500;
    padding:5px 6px;border-bottom:1px solid var(--border);
  }
  table.hist-table td{padding:6px 6px;border-bottom:1px solid var(--border);}
  table.hist-table td.num{font-family:'IBM Plex Mono',monospace;text-align:right;}

  .toast{
    position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);
    background:var(--ink);color:#fff;padding:10px 20px;border-radius:8px;
    font-size:13.5px;opacity:0;pointer-events:none;transition:opacity .2s ease, transform .2s ease;
    z-index:50;
  }
  .toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

  .link-toggle{
    background:none;border:none;color:var(--teal-dark);font-size:12.5px;
    font-weight:500;cursor:pointer;padding:0;text-decoration:underline;
  }

  #printSheet{display:none;}
  @media print{
    .app-shell{display:none !important;}
    #authScreen{display:none !important;}
    #printSheet.active{display:block !important;}
  }
  #printSheet .ps-header{border-bottom:2px solid #000;padding-bottom:10px;margin-bottom:16px;}
  #printSheet .ps-page{page-break-after:always;}
  #printSheet .ps-page:last-child{page-break-after:auto;}
  #printSheet .ps-header h1{font-size:20px;margin:0 0 4px;}
  #printSheet table{width:100%;border-collapse:collapse;font-size:12px;margin-top:10px;}
  #printSheet th, #printSheet td{border:1px solid #999;padding:6px 8px;text-align:left;}
  #printSheet th{background:#eee;}
  #printSheet .ps-meta{display:grid;grid-template-columns:1fr 1fr;gap:4px 20px;font-size:13px;margin-bottom:6px;}

  #printSheet .cover-page{padding:60px 20px 0;text-align:center;}
  #printSheet .cover-title{font-size:30px;font-weight:700;letter-spacing:0.3em;margin:0 0 70px;}
  #printSheet .cover-meta{
    text-align:left;width:75%;margin:0 auto 80px;font-size:15px;line-height:2.4;
  }
  #printSheet .cover-meta div{border-bottom:1px solid #999;padding:4px 4px;}
  #printSheet .cover-meta span.k{display:inline-block;width:7em;color:#333;}
  #printSheet .stamp-label{text-align:left;font-size:13px;margin:0 0 6px;}
  #printSheet table.stamp-table{width:100%;border-collapse:collapse;table-layout:fixed;}
  #printSheet table.stamp-table td{border:1px solid #000;height:56px;text-align:center;vertical-align:middle;padding:4px;}
  #printSheet table.stamp-table td.stamp-label-cell{font-weight:600;background:#f0f0f0;width:14%;}

  .footer-note{margin-top:36px;padding-top:16px;border-top:1px solid var(--border);font-size:12px;color:var(--ink-faint);}

  .teacher-chip-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px;}
  .teacher-chip{
    display:flex;align-items:center;gap:6px;
    background:var(--teal-tint);color:var(--teal-dark);
    padding:6px 8px 6px 12px;border-radius:20px;font-size:13px;font-weight:500;
  }
  .teacher-chip button{
    appearance:none;border:none;background:none;color:var(--teal-dark);
    cursor:pointer;font-size:15px;line-height:1;padding:2px;opacity:0.6;
  }
  .teacher-chip button:hover{opacity:1;}
  .add-teacher-row{display:flex;gap:8px;}
  .add-teacher-row input{flex:1;}
  .add-teacher-row button{flex:none;}
  .save-note{font-size:12px;color:var(--ink-faint);margin-top:10px;}

/* サイト共通フッター（新規追加ページとも共通で使用） */
.site-footer{
  width:100%;max-width:980px;margin:8px auto 0;padding:20px 4px 0;
  border-top:1px solid var(--border);
  display:flex;flex-direction:column;align-items:center;gap:10px;
}
.site-footer-nav{display:flex;flex-wrap:wrap;gap:18px;justify-content:center;}
.site-footer-nav a{
  font-size:13px;color:var(--ink-soft);text-decoration:none;
}
.site-footer-nav a:hover{color:var(--teal-dark);text-decoration:underline;}
.site-footer-copy{font-size:11.5px;color:var(--ink-faint);margin:0;}

/* ============================================
   コンテンツページ共通スタイル
   （guide.html / faq.html / privacy.html / contact.html などで使用）
============================================ */
.content-page{max-width:760px;margin:0 auto;padding:0 20px 80px;}

.content-header{
  padding:28px 0 20px;border-bottom:1px solid var(--border);margin-bottom:32px;
}
.content-header .brandrow-sm{display:flex;align-items:center;gap:10px;}
.content-header .brandrow-sm h1{
  font-family:'Space Grotesk',sans-serif;font-size:19px;font-weight:700;margin:0;color:var(--ink);
}
.content-back{
  display:inline-block;margin-top:10px;font-size:13px;color:var(--ink-soft);text-decoration:none;
}
.content-back:hover{color:var(--teal-dark);text-decoration:underline;}

.content-page h1.page-title{
  font-family:'Space Grotesk',sans-serif;font-size:26px;font-weight:700;
  margin:0 0 8px;color:var(--ink);line-height:1.4;
}
.content-page p.page-lead{
  font-size:14.5px;color:var(--ink-soft);margin:0 0 36px;line-height:1.8;
}
.content-page section{margin-bottom:40px;}
.content-page h2{
  font-family:'Space Grotesk',sans-serif;font-size:18px;font-weight:600;
  margin:0 0 14px;color:var(--ink);
  padding-bottom:8px;border-bottom:1px solid var(--border);
}
.content-page h3{
  font-size:15px;font-weight:600;margin:22px 0 8px;color:var(--teal-dark);
}
.content-page p{font-size:14.5px;color:var(--ink);line-height:1.9;margin:0 0 12px;}
.content-page ul, .content-page ol{
  font-size:14.5px;color:var(--ink);line-height:1.9;padding-left:22px;margin:0 0 12px;
}
.content-page li{margin-bottom:6px;}

.benefit-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0 0;}
@media (max-width:600px){.benefit-grid{grid-template-columns:1fr;}}
.benefit-card{
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:16px 18px;box-shadow:var(--shadow);
}
.benefit-card h3{margin:0 0 6px;font-size:14.5px;color:var(--teal-dark);}
.benefit-card p{font-size:13.5px;margin:0;color:var(--ink-soft);line-height:1.75;}

.step-block{
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:20px 22px;box-shadow:var(--shadow);margin-bottom:18px;
}
.step-block .step-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:26px;height:26px;border-radius:50%;background:var(--teal);color:#fff;
  font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:13px;margin-right:8px;
}
.step-block h3{margin:0 0 10px;font-size:15.5px;color:var(--ink);display:flex;align-items:center;}
.step-block .field-note{
  background:var(--gray-tint);border-radius:8px;padding:10px 14px;
  font-size:13.5px;color:var(--ink-soft);margin-top:10px;line-height:1.8;
}

.cta-box{
  background:var(--teal-tint);border:1px solid var(--teal);border-radius:12px;
  padding:22px 24px;text-align:center;margin-top:8px;
}
.cta-box p{color:var(--teal-dark);margin:0 0 14px;font-size:14.5px;}
.cta-box a.btn-link{
  display:inline-block;background:var(--teal);color:#fff;text-decoration:none;
  padding:10px 22px;border-radius:8px;font-size:14px;font-weight:500;
}
.cta-box a.btn-link:hover{background:var(--teal-dark);}

/* ============================================
   FAQページ専用スタイル
============================================ */
.faq-item{
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:18px 20px;box-shadow:var(--shadow);margin-bottom:14px;
}
.faq-q{
  position:relative;padding-left:22px;
  font-size:15px;font-weight:600;color:var(--ink);margin:0 0 10px;
}
.faq-q .faq-mark{
  position:absolute;left:0;top:0;
  font-family:'Space Grotesk',sans-serif;color:var(--teal);font-weight:700;
}
.faq-a{
  position:relative;padding-left:22px;
  font-size:14px;color:var(--ink-soft);line-height:1.85;margin:0;
}
.faq-a .faq-mark{
  position:absolute;left:0;top:0;
  font-family:'Space Grotesk',sans-serif;color:var(--amber);font-weight:700;
}
.faq-category{
  font-size:12.5px;font-weight:600;color:var(--teal-dark);
  letter-spacing:0.04em;margin:0 0 12px;
}

/* ============================================
   お問い合わせページ（Googleフォーム埋め込み）
============================================ */
.form-embed-wrap{
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:12px;box-shadow:var(--shadow);
}
.form-embed-wrap iframe{
  width:100%;height:900px;border:none;display:block;
}
@media (max-width:600px){
  .form-embed-wrap iframe{height:1100px;}
}