:root{
    --ink:#1B1B1B; --ink-soft:#4A4A4A; --paper:#F6F0DF; --paper-card:#FFFCF3;
    --orange:#D05F27; --orange-dark:#B54F1F; --gold:#C7B041; --blue:#0093C8;
    --grey:#8A8A8D; --grey-line:#DEDEDC; --good:#3F8F5C;
  }
  *{box-sizing:border-box;}
  body{ margin:0; background:var(--paper); color:var(--ink); font-family:'Work Sans', sans-serif; line-height:1.55; -webkit-font-smoothing:antialiased; }
  h1,h2,h3{ font-family:'Bricolage Grotesque', sans-serif; font-weight:700; letter-spacing:-0.01em; margin:0; }
  .hand{ font-family:'Kalam', cursive; }
  .mono{ font-family:'IBM Plex Mono', monospace; }
  a{color:inherit;} button{font-family:inherit;}
  .wrap{ max-width:var(--site-content-max, 1400px); margin:0 auto; padding:0 32px; }
  @media (max-width:640px){ .wrap{padding:0 20px;} }
  .mockup-banner{ background:var(--ink); color:#fff; text-align:center; padding:10px 16px; font-family:'IBM Plex Mono', monospace; font-size:12px; }

  nav{ background:var(--blue); border-bottom:1.5px solid var(--ink); position:sticky; top:0; z-index:50; }
  .nav-inner{ max-width:var(--site-content-max, 1400px); margin:0 auto; padding:16px 32px; display:flex; align-items:center; justify-content:space-between; }
  .logo{ font-family:'Bricolage Grotesque', sans-serif; font-size:17px; font-weight:700; display:flex; align-items:center; gap:9px; color:#fff; }
  .logo-tag{ font-family:'Kalam',cursive; font-size:13px; color:#FFDE8A; margin-left:10px; display:inline-block; }
  @media (max-width:950px){ .logo-tag{display:none;} }
  .nav-links{ display:flex; gap:24px; font-size:13.5px; font-weight:500; }
  .nav-links a{ text-decoration:none; color:#fff; }
  .nav-links a.active{ text-decoration:underline; text-underline-offset:4px; }
  .nav-cta{ background:var(--orange); color:#fff; padding:10px 18px; border-radius:3px; font-size:13.5px; font-weight:700; text-decoration:none; font-family:'Bricolage Grotesque',sans-serif; border:1.5px solid var(--ink); box-shadow:2px 2px 0 var(--ink); }
  @media (max-width:820px){ .nav-links{display:none;} }

  .breadcrumb{ padding:20px 0 0; font-family:'IBM Plex Mono',monospace; font-size:11.5px; color:var(--grey); }
  .breadcrumb a{ color:var(--orange-dark); text-decoration:none; }

  /* ---------- HUB HEADER ---------- */
  .hub-header{ padding:26px 0 30px; }
  .series-tag{ display:inline-block; background:rgba(199,176,65,0.32); padding:4px 12px; font-family:'Kalam',cursive; font-size:13.5px; color:var(--ink); margin-bottom:14px; }
  .hub-header h1{ font-size:36px; color:var(--ink); max-width:660px; line-height:1.15; }
  @media (max-width:640px){ .hub-header h1{font-size:26px;} }
  .hub-header p{ font-size:16px; color:var(--ink-soft); max-width:560px; margin:16px 0 0; line-height:1.6; }
  .format-note{ font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--grey); margin-top:14px; }

  section{ padding:16px 0 40px; }
  @media (max-width:640px){ section{padding:12px 0 28px;} }
  .cat-head{ display:flex; align-items:baseline; gap:12px; margin-bottom:16px; margin-top:8px; }
  .cat-head h2{ font-size:18px; color:var(--ink); }
  .cat-head .n{ font-family:'IBM Plex Mono',monospace; font-size:11px; color:var(--grey); }

  /* ---------- INSTALLMENT CARDS ---------- */
  .installment-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:14px; margin-bottom:36px; }
  @media (max-width:900px){ .installment-grid{grid-template-columns:1fr 1fr;} }
  @media (max-width:560px){ .installment-grid{grid-template-columns:1fr;} }

  .installment-card{ display:block; text-decoration:none; background:#fff; border:1.5px solid var(--ink); padding:16px 18px; position:relative; }
  .installment-card.live{ border-color:var(--orange); background:var(--paper-card); }
  .live-badge{ position:absolute; top:-10px; left:14px; background:var(--orange); color:#fff; font-family:'IBM Plex Mono',monospace; font-size:9px; font-weight:700; padding:3px 9px; border-radius:20px; letter-spacing:0.03em; }
  .installment-card .prefix{ font-family:'Kalam',cursive; font-size:12px; color:var(--orange-dark); }
  .installment-card .topic{ font-family:'Bricolage Grotesque',sans-serif; font-weight:700; font-size:14.5px; color:var(--ink); line-height:1.3; margin-top:2px; }
  .installment-card .status{ font-family:'IBM Plex Mono',monospace; font-size:10.5px; color:var(--grey); margin-top:10px; display:flex; align-items:center; gap:6px; }
  .installment-card .status .dot{ width:6px; height:6px; border-radius:50%; background:var(--grey-line); }
  .installment-card.live .status .dot{ background:var(--good); }
  .installment-card.live .status{ color:var(--good); }

  .divider{ height:3px; background:var(--blue); position:relative; opacity:0.55; }
  .divider::after{ content:'✻'; position:absolute; left:50%; top:-13px; transform:translateX(-50%); font-size:20px; color:var(--blue); background:var(--paper); padding:0 8px; }

  .origin-note{ background:var(--paper-card); border-left:3px solid var(--orange); padding:20px 24px; max-width:740px; }

  /* ---------- LAZY BUTTON ---------- */
  .lazy-fab{
    position:fixed; bottom:22px; right:22px; z-index:70;
    background:var(--gold); color:var(--ink); font-family:'Kalam',cursive; font-weight:700; font-size:14.5px;
    padding:11px 18px; border-radius:30px; text-decoration:none; display:flex; align-items:center; gap:8px;
    box-shadow:2px 4px 10px rgba(0,0,0,0.25); border:1.5px solid var(--ink);
    transform:rotate(-1.5deg); transition:transform 0.15s;
  }
  .lazy-fab:hover{ transform:rotate(0deg) scale(1.03); }
  @media (max-width:560px){ .lazy-fab{ bottom:14px; right:14px; font-size:13px; padding:9px 14px; } }
  .origin-note-label{ font-family:'IBM Plex Mono',monospace; font-size:10.5px; text-transform:uppercase; letter-spacing:0.06em; color:var(--orange-dark); margin-bottom:8px; }
  .origin-note p{ font-family:'Kalam',cursive; font-size:16.5px; color:var(--ink); line-height:1.55; margin:0; }
  .origin-note .sign{ font-family:'IBM Plex Mono',monospace; font-size:11px; color:var(--grey); margin-top:10px; }

  footer{ border-top:1.5px solid var(--ink); padding:40px 0 32px; background:var(--paper); }
  .footer-top{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px; margin-bottom:20px; padding-bottom:18px; border-bottom:1px dashed var(--grey-line); }
  .footer-tag{ font-size:13px; color:var(--grey); font-family:'Kalam',cursive; }
  .legal{ margin-top:20px; font-size:11px; color:var(--grey); line-height:1.6; max-width:900px; }