:root{
    --ink:#1A2744;
    --ink-soft:#2B3A5C;
    --chalk:#FAF7F0;
    --chalk-dim:#EDE7D9;
    --coral:#FF4731;
    --coral-dark:#D6371F;
    --yellow:#FFC53D;
    --mint:#3DDC97;
    --mint-dark:#1FAE74;
    --display:'Space Grotesk',sans-serif;
    --body:'Inter',sans-serif;
    --mono:'JetBrains Mono',monospace;
  }

  *{margin:0;padding:0;box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--chalk);
    color:var(--ink);
    font-family:var(--body);
    overflow-x:hidden;
    -webkit-font-smoothing:antialiased;
  }
  img,svg{display:block;max-width:100%;}
  a{color:inherit;}

  .wrap{max-width:1180px;margin:0 auto;padding:0 28px;}

  @media (prefers-reduced-motion: reduce){
    *{animation-duration:0.01ms !important;animation-iteration-count:1 !important;transition-duration:0.01ms !important;}
  }

  /* ===== TOP RIBBON ===== */
  .ribbon{
    background:var(--ink);
    color:var(--chalk);
    font-family:var(--mono);
    font-size:13px;
    letter-spacing:0.04em;
    text-align:center;
    padding:9px 16px;
    font-weight:500;
  }
  .ribbon span{color:var(--yellow);font-weight:700;}

  /* ===== HEADER ===== */
  header{
    padding:24px 0 0;
  }
  .nav{
    display:flex;
    align-items:center;
    justify-content:space-between;
  }
  .logo{
    font-family:var(--display);
    font-weight:700;
    font-size:19px;
    letter-spacing:-0.01em;
    display:flex;
    align-items:center;
    gap:9px;
  }
  .logo .logo-img{
    width:34px;height:34px;
    border-radius:50%;
    object-fit:cover;
    flex-shrink:0;
  }
  .nav-cta{
    background:var(--ink);
    color:var(--chalk);
    font-family:var(--body);
    font-weight:700;
    font-size:14px;
    padding:11px 20px;
    border-radius:100px;
    text-decoration:none;
    white-space:nowrap;
  }

  /* ===== HERO ===== */
  .hero{
    padding:64px 0 40px;
    position:relative;
  }
  .hero-grid{
    display:grid;
    grid-template-columns:1.15fr 0.85fr;
    gap:56px;
    align-items:center;
  }
  .eyebrow{
    display:inline-flex;
    align-items:center;
    gap:8px;
    font-family:var(--mono);
    font-size:13px;
    font-weight:600;
    background:var(--ink);
    color:var(--chalk);
    padding:7px 14px 7px 10px;
    border-radius:100px;
    margin-bottom:26px;
  }
  .eyebrow .pulse{
    width:8px;height:8px;border-radius:50%;
    background:var(--mint);
    flex-shrink:0;
  }
  h1{
    font-family:var(--display);
    font-weight:700;
    font-size:clamp(40px,6vw,68px);
    line-height:0.98;
    letter-spacing:-0.025em;
  }
  h1 .strike-wrap{
    position:relative;
    display:inline-block;
  }
  h1 .strike-wrap .struck{
    color:var(--ink-soft);
    opacity:0.42;
  }
  h1 .strike-wrap svg{
    position:absolute;
    left:-3%;
    top:38%;
    width:106%;
    height:auto;
    overflow:visible;
  }
  h1 .pop{
    color:var(--coral);
  }
  .hero-sub{
    margin-top:24px;
    font-size:19px;
    line-height:1.55;
    color:var(--ink-soft);
    max-width:480px;
    font-weight:500;
  }
  .hero-actions{
    margin-top:34px;
    display:flex;
    align-items:center;
    gap:20px;
    flex-wrap:wrap;
  }
  .btn-primary{
    background:var(--coral);
    color:var(--chalk);
    font-family:var(--display);
    font-weight:700;
    font-size:17px;
    padding:18px 32px;
    border-radius:14px;
    text-decoration:none;
    display:inline-flex;
    align-items:center;
    gap:10px;
    box-shadow:0 6px 0 var(--coral-dark);
    transition:transform 0.12s ease, box-shadow 0.12s ease;
    border:none;
    cursor:pointer;
  }
  .btn-primary:hover{
    transform:translateY(2px);
    box-shadow:0 4px 0 var(--coral-dark);
  }
  .btn-primary:active{
    transform:translateY(6px);
    box-shadow:0 0 0 var(--coral-dark);
  }
  .price-tag{
    font-family:var(--mono);
    font-size:14px;
    line-height:1.4;
  }
  .price-tag .was{
    text-decoration:line-through;
    color:#9398a8;
  }
  .price-tag .now{
    font-weight:700;
    color:var(--ink);
    font-size:17px;
  }

  .hero-art{
    position:relative;
    display:flex;
    align-items:center;
    justify-content:center;
  }
  .stack-photo{
    position:relative;
    width:100%;
    max-width:420px;
  }
  .stack-photo img{
    width:100%;
    height:auto;
    display:block;
    filter:drop-shadow(0 30px 50px rgba(26,39,68,0.35));
  }
  .badge-float{
    position:absolute;
    bottom:8%;
    right:-4%;
    background:var(--coral);
    color:var(--chalk);
    font-family:var(--mono);
    font-weight:700;
    font-size:13px;
    padding:10px 16px;
    border-radius:100px;
    transform:rotate(8deg);
    z-index:4;
    box-shadow:0 8px 18px -4px rgba(255,71,49,0.5);
  }

  /* ===== TRUST STRIP ===== */
  .trust{
    border-top:2px solid var(--ink);
    border-bottom:2px solid var(--ink);
    padding:22px 0;
    margin-top:48px;
  }
  .trust-row{
    display:flex;
    justify-content:space-between;
    flex-wrap:wrap;
    gap:18px 36px;
    font-family:var(--mono);
    font-size:13px;
    font-weight:600;
    color:var(--ink-soft);
  }
  .trust-row span{color:var(--ink);}

  /* ===== SECTION HEADERS ===== */
  .section{padding:96px 0;}
  .section.tight{padding:72px 0;}
  .sec-eyebrow{
    font-family:var(--mono);
    font-size:13px;
    font-weight:700;
    color:var(--coral-dark);
    letter-spacing:0.05em;
    text-transform:uppercase;
    margin-bottom:14px;
    display:block;
  }
  .sec-title{
    font-family:var(--display);
    font-weight:700;
    font-size:clamp(30px,4vw,44px);
    letter-spacing:-0.02em;
    line-height:1.06;
    max-width:680px;
  }
  .sec-sub{
    margin-top:18px;
    font-size:17px;
    line-height:1.6;
    color:var(--ink-soft);
    max-width:560px;
    font-weight:500;
  }

  /* ===== PRINCIPLE STRIP ===== */
  .principles{
    background:var(--ink);
    color:var(--chalk);
    border-radius:28px;
    padding:54px 44px;
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:8px;
  }
  .principle{
    padding:22px 22px 0;
    border-left:2px solid rgba(250,247,240,0.18);
  }
  .principle:first-child{border-left:none;padding-left:0;}
  .principle-num{
    font-family:var(--mono);
    font-size:13px;
    color:var(--yellow);
    font-weight:600;
    margin-bottom:14px;
    display:block;
  }
  .principle h3{
    font-family:var(--display);
    font-size:21px;
    font-weight:600;
    margin-bottom:10px;
    letter-spacing:-0.01em;
  }
  .principle p{
    font-size:14.5px;
    line-height:1.55;
    color:#C7CCDB;
  }

  /* ===== BOOK CARDS ===== */
  .books-grid{
    margin-top:52px;
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:22px;
  }
  .book-card{
    background:var(--chalk-dim);
    border:2px solid var(--ink);
    border-radius:20px;
    padding:30px;
    position:relative;
    overflow:hidden;
    transition:transform 0.18s ease;
    display:grid;
    grid-template-columns:96px 1fr;
    gap:22px;
  }
  .book-card:hover{
    transform:translateY(-4px);
  }
  .book-cover{
    width:96px;
    height:128px;
    border-radius:9px;
    overflow:hidden;
    box-shadow:0 10px 22px -8px rgba(26,39,68,0.4);
    border:2px solid var(--ink);
    flex-shrink:0;
  }
  .book-cover img{
    width:100%;
    height:100%;
    object-fit:cover;
    display:block;
  }
  .book-card.featured{
    grid-column:1 / -1;
    background:var(--ink);
    color:var(--chalk);
    display:grid;
    grid-template-columns:120px 1fr;
    gap:28px;
    align-items:start;
  }
  .book-card.featured .book-cover{
    width:120px;
    height:160px;
    border-color:rgba(250,247,240,0.25);
  }
  .book-num{
    font-family:var(--mono);
    font-size:12px;
    font-weight:600;
    color:var(--coral-dark);
    text-transform:uppercase;
    letter-spacing:0.05em;
    display:block;
    margin-bottom:8px;
  }
  .book-card.featured .book-num{color:var(--mint);}
  .book-title{
    font-family:var(--display);
    font-weight:700;
    font-size:21px;
    letter-spacing:-0.01em;
    margin-bottom:10px;
    line-height:1.15;
  }
  .book-title .struck-mini{
    position:relative;
    color:inherit;
    opacity:1;
  }
  .book-desc{
    font-size:14.5px;
    line-height:1.6;
    color:var(--ink-soft);
  }
  .book-card.featured .book-desc{color:#C7CCDB;}
  .book-pages{
    margin-top:14px;
    font-family:var(--mono);
    font-size:12.5px;
    font-weight:600;
    color:var(--ink-soft);
    opacity:0.7;
  }
  .book-card.featured .book-pages{color:var(--mint);opacity:1;}

  /* ===== VALUE / PRICE BLOCK ===== */
  .value-block{
    background:var(--coral);
    border-radius:28px;
    padding:56px 48px;
    color:var(--chalk);
    display:grid;
    grid-template-columns:1fr auto;
    align-items:center;
    gap:40px;
  }
  .value-left h2{
    font-family:var(--display);
    font-size:clamp(26px,3.4vw,36px);
    font-weight:700;
    letter-spacing:-0.02em;
    margin-bottom:16px;
    line-height:1.1;
  }
  .value-rows{
    display:flex;
    flex-direction:column;
    gap:10px;
    font-family:var(--mono);
    font-size:15px;
    margin-top:22px;
  }
  .value-row{
    display:flex;
    justify-content:space-between;
    gap:18px;
    max-width:380px;
    padding-bottom:10px;
    border-bottom:1px solid rgba(250,247,240,0.3);
  }
  .value-row span:first-child{
    white-space:nowrap;
  }
  .value-row.total{
    font-weight:700;
    font-size:18px;
    border-bottom:none;
    padding-top:4px;
  }
  .value-right{
    text-align:center;
    background:var(--chalk);
    color:var(--ink);
    border-radius:20px;
    padding:36px 40px;
    min-width:240px;
  }
  .value-right .big-price{
    font-family:var(--display);
    font-size:56px;
    font-weight:700;
    letter-spacing:-0.03em;
  }
  .value-right .save-tag{
    font-family:var(--mono);
    font-size:13px;
    font-weight:700;
    color:var(--mint-dark);
    margin-top:6px;
    margin-bottom:22px;
  }
  .btn-block{
    background:var(--ink);
    color:var(--chalk);
    font-family:var(--display);
    font-weight:700;
    font-size:16px;
    padding:16px 0;
    border-radius:12px;
    text-decoration:none;
    display:block;
    text-align:center;
    box-shadow:0 5px 0 #0d1426;
    transition:transform 0.12s ease, box-shadow 0.12s ease;
  }
  .btn-block:hover{
    transform:translateY(2px);
    box-shadow:0 3px 0 #0d1426;
  }

  /* ===== NUMBERED TOPICS (inside each book) ===== */
  .topics-toggle{
    margin-top:18px;
    font-family:var(--mono);
    font-size:13px;
    font-weight:700;
    color:var(--ink);
    opacity:0.55;
  }
  .topics-list{
    margin-top:14px;
    display:flex;
    flex-direction:column;
    gap:9px;
  }
  .topic-row{
    display:flex;
    align-items:baseline;
    gap:12px;
    font-size:13.5px;
    line-height:1.4;
  }
  .topic-row .topic-n{
    font-family:var(--mono);
    font-weight:700;
    color:var(--coral-dark);
    flex-shrink:0;
    width:20px;
  }
  .book-card.featured .topic-row .topic-n{color:var(--mint);}
  .topic-row .topic-t{color:var(--ink-soft);}
  .book-card.featured .topic-row .topic-t{color:#C7CCDB;}
  .topics-more{
    margin-top:10px;
    padding-left:32px;
    font-size:12.5px;
    font-style:italic;
    color:var(--ink-soft);
    opacity:0.7;
  }
  .book-card.featured .topics-more{color:#C7CCDB;opacity:0.7;}

  /* ===== TIME SAVED COMPARISON ===== */
  .compare-block{
    background:var(--ink);
    border-radius:28px;
    padding:60px 52px;
    color:var(--chalk);
  }
  .compare-head{
    max-width:600px;
    margin-bottom:44px;
  }
  .compare-head .sec-eyebrow{color:var(--mint);}
  .compare-head h2{
    font-family:var(--display);
    font-weight:700;
    font-size:clamp(28px,3.6vw,38px);
    letter-spacing:-0.02em;
    line-height:1.12;
    color:var(--chalk);
  }
  .compare-head p{
    margin-top:16px;
    font-size:16px;
    line-height:1.6;
    color:#C7CCDB;
  }
  .compare-cols{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:28px;
  }
  .compare-col{
    background:rgba(250,247,240,0.05);
    border:1.5px solid rgba(250,247,240,0.14);
    border-radius:18px;
    padding:28px 26px;
  }
  .compare-col.win{
    background:rgba(61,220,151,0.08);
    border-color:rgba(61,220,151,0.35);
  }
  .compare-col-label{
    font-family:var(--mono);
    font-size:12px;
    font-weight:700;
    text-transform:uppercase;
    letter-spacing:0.06em;
    color:#9098B0;
    margin-bottom:4px;
    display:block;
  }
  .compare-col.win .compare-col-label{color:var(--mint);}
  .compare-col-title{
    font-family:var(--display);
    font-size:19px;
    font-weight:600;
    margin-bottom:18px;
    letter-spacing:-0.01em;
  }
  .compare-row{
    display:flex;
    justify-content:space-between;
    align-items:baseline;
    gap:14px;
    padding:11px 0;
    border-bottom:1px solid rgba(250,247,240,0.1);
    font-size:14px;
  }
  .compare-row:last-of-type{border-bottom:none;}
  .compare-row .label{color:#C7CCDB;}
  .compare-row .val{
    font-family:var(--mono);
    font-weight:700;
    white-space:nowrap;
    color:var(--chalk);
  }
  .compare-col.win .compare-row .val{color:var(--mint);}
  .compare-total{
    margin-top:14px;
    padding-top:16px;
    border-top:1.5px solid rgba(250,247,240,0.2);
    display:flex;
    justify-content:space-between;
    align-items:baseline;
  }
  .compare-total .label{
    font-family:var(--display);
    font-weight:600;
    font-size:15px;
  }
  .compare-total .val{
    font-family:var(--display);
    font-weight:700;
    font-size:26px;
  }
  .compare-col.win .compare-total .val{color:var(--mint);}
  .compare-footnote{
    margin-top:10px;
    font-size:11.5px;
    color:#7B8299;
    line-height:1.5;
  }
  .compare-callout{
    margin-top:28px;
    background:var(--coral);
    border-radius:14px;
    padding:18px 24px;
    font-family:var(--display);
    font-weight:700;
    font-size:17px;
    display:flex;
    align-items:center;
    gap:12px;
  }

  /* ===== WHO FOR ===== */
  .who-grid{
    margin-top:48px;
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:20px;
  }
  .who-card{
    padding:28px;
    border-radius:18px;
    background:var(--chalk-dim);
  }
  .who-card .icon-box{
    width:46px;height:46px;
    border-radius:50%;
    background:var(--yellow);
    display:flex;
    align-items:center;
    justify-content:center;
    margin-bottom:18px;
    font-family:var(--mono);
    font-weight:700;
  }
  .who-card h3{
    font-family:var(--display);
    font-size:18px;
    font-weight:600;
    margin-bottom:8px;
    letter-spacing:-0.01em;
  }
  .who-card p{
    font-size:14px;
    line-height:1.55;
    color:var(--ink-soft);
  }

  /* ===== ORDER PATH ===== */
  .path{
    margin-top:54px;
    display:flex;
    align-items:center;
    gap:0;
    flex-wrap:wrap;
    font-family:var(--mono);
    font-weight:700;
    font-size:15px;
  }
  .path-step{
    background:var(--ink);
    color:var(--chalk);
    padding:12px 20px;
    border-radius:100px;
  }
  .path-arrow{
    color:var(--coral);
    font-size:20px;
    padding:0 12px;
  }

  /* ===== FINAL CTA ===== */
  .final-cta{
    background:var(--ink);
    border-radius:32px;
    padding:72px 48px;
    text-align:center;
    position:relative;
    overflow:hidden;
  }
  .final-cta::before{
    content:"";
    position:absolute;
    width:420px;height:420px;
    background:var(--mint);
    border-radius:50%;
    filter:blur(110px);
    opacity:0.25;
    top:-180px;
    left:-100px;
  }
  .final-cta::after{
    content:"";
    position:absolute;
    width:360px;height:360px;
    background:var(--coral);
    border-radius:50%;
    filter:blur(110px);
    opacity:0.25;
    bottom:-160px;
    right:-80px;
  }
  .final-cta-inner{position:relative;z-index:1;}
  .final-cta h2{
    font-family:var(--display);
    color:var(--chalk);
    font-size:clamp(30px,4.2vw,46px);
    font-weight:700;
    letter-spacing:-0.02em;
    line-height:1.08;
    max-width:640px;
    margin:0 auto 18px;
  }
  .final-cta p{
    color:#C7CCDB;
    font-size:17px;
    max-width:460px;
    margin:0 auto 34px;
    line-height:1.6;
  }
  .final-price{
    font-family:var(--mono);
    color:var(--chalk);
    font-size:15px;
    margin-top:18px;
  }
  .final-price .now{
    color:var(--yellow);
    font-weight:700;
    font-size:18px;
  }

  /* ===== FOOTER ===== */
  footer{
    padding:48px 0 40px;
    border-top:2px solid var(--ink);
    margin-top:40px;
  }
  .foot-row{
    display:flex;
    justify-content:space-between;
    align-items:center;
    flex-wrap:wrap;
    gap:16px;
    font-family:var(--mono);
    font-size:13px;
    color:var(--ink-soft);
  }
  .foot-row a{text-decoration:none;color:var(--ink-soft);}
  .foot-row a:hover{color:var(--coral);}

  /* ===== RESPONSIVE ===== */
  @media (max-width: 880px){
    .hero-grid{grid-template-columns:1fr;gap:48px;}
    .hero-art{order:-1;}
    .stack-photo{max-width:300px;margin:0 auto;}
    .principles{grid-template-columns:1fr;padding:36px 28px;}
    .principle{border-left:none;border-top:2px solid rgba(250,247,240,0.18);padding:22px 0 0;}
    .principle:first-child{border-top:none;padding-top:0;}
    .books-grid{grid-template-columns:1fr;}
    .book-card.featured{grid-template-columns:1fr;text-align:left;}
    .value-block{grid-template-columns:1fr;padding:40px 28px;}
    .value-right{min-width:0;}
    .value-row{max-width:none;}
    .who-grid{grid-template-columns:1fr;}
    .trust-row{justify-content:flex-start;}
    .final-cta{padding:56px 26px;}
    .section{padding:64px 0;}
    .compare-block{padding:40px 26px;}
    .compare-cols{grid-template-columns:1fr;gap:18px;}
  }
  @media (max-width: 540px){
    .wrap{padding:0 20px;}
    h1{font-size:clamp(34px,9vw,44px);}
    .nav-cta{padding:9px 16px;font-size:13px;}
    .hero-actions{flex-direction:column;align-items:flex-start;gap:16px;}
    .btn-primary{width:100%;justify-content:center;}
    .value-row{max-width:none;font-size:13px;gap:10px;}
    .compare-block{padding:32px 20px;}
    .compare-col{padding:22px 18px;}
  }

  /* =========================================================
     STORE ADDITIONS — hub, bundle cards, catalogue grid, nav
     ========================================================= */

  /* the palette gained a blue when the Biology bundle landed */
  :root{--blue:#4C9BE8;}

  /* ===== NAV LINKS ===== */
  .nav-links{
    display:flex;
    align-items:center;
    gap:26px;
    font-family:var(--mono);
    font-size:13px;
    font-weight:500;
    letter-spacing:0.02em;
  }
  .nav-links a{
    text-decoration:none;
    color:var(--ink-soft);
    padding-bottom:3px;
    border-bottom:2px solid transparent;
    white-space:nowrap;
  }
  .nav-links a:hover{color:var(--ink);border-bottom-color:var(--coral);}
  .nav-links a.on{color:var(--ink);border-bottom-color:var(--ink);font-weight:700;}
  .nav-right{display:flex;align-items:center;gap:24px;}
  /* Seven bundles fit a wide desktop but not a small laptop. Tighten the row
     before the breakpoint that hides it, so the buy button is never pushed
     off the right edge. */
  @media (max-width: 1180px){
    .nav-links{gap:15px;font-size:12px;}
    .nav-right{gap:14px;}
  }

  /* ===== HERO (store variant) ===== */
  .hero-store{
    padding:70px 0 8px;
    text-align:center;
  }
  .hero-store h1{max-width:14ch;margin:0 auto 22px;}
  .hero-store .hero-sub{max-width:60ch;margin:0 auto;}
  .hero-store .eyebrow{margin-bottom:26px;}

  /* ===== BUNDLE CARDS ===== */
  /* auto-fills: 3 across on desktop, wrapping cleanly as bundles are added */
  .bundles{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(330px,1fr));
    gap:22px;
  }
  .bundle{
    background:var(--ink);
    color:var(--chalk);
    border-radius:22px;
    padding:30px 26px 28px;
    display:flex;
    flex-direction:column;
    position:relative;
    overflow:hidden;
    border:3px solid var(--ink);
  }
  .bundle::after{
    content:"";
    position:absolute;
    right:-70px;top:-70px;
    width:190px;height:190px;
    border-radius:50%;
    background:var(--accent,var(--coral));
    opacity:0.16;
  }
  .bundle-kicker{
    font-family:var(--mono);
    font-size:11.5px;
    font-weight:600;
    letter-spacing:0.09em;
    text-transform:uppercase;
    color:var(--accent,var(--coral));
    margin-bottom:8px;
    position:relative;
    z-index:1;
  }
  .bundle h2{
    font-family:var(--display);
    font-size:26px;
    font-weight:700;
    letter-spacing:-0.02em;
    line-height:1.1;
    margin-bottom:11px;
    position:relative;
    z-index:1;
  }
  .bundle .bundle-pitch{
    font-size:14.5px;
    line-height:1.55;
    color:#C7CCDB;
    margin-bottom:20px;
    min-height:4.65em;
    position:relative;
    z-index:1;
  }
  .bundle-stack{
    position:relative;
    height:118px;
    margin-bottom:20px;
    z-index:1;
  }
  .bundle-stack img{
    position:absolute;
    bottom:0;
    width:66px;
    border-radius:6px;
    box-shadow:0 8px 20px rgba(0,0,0,0.5);
    border:1px solid rgba(250,247,240,0.15);
    transform-origin:bottom center;
  }
  .bundle-stack img:nth-child(1){left:0;    transform:rotate(-11deg);           z-index:1;}
  .bundle-stack img:nth-child(2){left:52px; transform:rotate(-5.5deg) translateY(-5px); z-index:2;}
  .bundle-stack img:nth-child(3){left:104px;transform:rotate(0deg)    translateY(-8px); z-index:3;}
  .bundle-stack img:nth-child(4){left:156px;transform:rotate(5.5deg)  translateY(-5px); z-index:2;}
  .bundle-stack img:nth-child(5){left:208px;transform:rotate(11deg);            z-index:1;}

  .bundle-solo{position:relative;height:118px;margin-bottom:20px;z-index:1;}
  .bundle-solo img{height:118px;width:auto;border-radius:6px;
    border:1px solid rgba(250,247,240,.15);box-shadow:0 8px 20px rgba(0,0,0,.5);}
  /* used when a bundle's artwork isn't uploaded yet */
  .bundle-mark{position:relative;height:118px;margin-bottom:20px;z-index:1;
    display:flex;align-items:center;gap:18px;}
  .bundle-mark span{font-size:64px;line-height:1;
    background:rgba(250,247,240,.06);border:1px solid rgba(250,247,240,.16);
    border-radius:14px;padding:14px 18px;}
  .bundle-mark em{font-style:normal;font-family:var(--mono);font-size:15px;
    line-height:1.5;letter-spacing:.06em;text-transform:uppercase;
    color:var(--accent,var(--coral));}

  .bundle-list{
    list-style:none;
    margin:0 0 24px;
    position:relative;
    z-index:1;
  }
  .bundle-list li{
    font-family:var(--mono);
    font-size:13px;
    color:#C7CCDB;
    padding:8px 0;
    border-bottom:1px solid rgba(250,247,240,0.13);
    display:flex;
    justify-content:space-between;
    gap:14px;
  }
  .bundle-list li span{color:var(--chalk);font-weight:500;}
  .bundle-list li em{font-style:normal;opacity:0.6;}
  .bundle-foot{
    margin-top:auto;
    position:relative;
    z-index:1;
  }
  .bundle-price{
    display:flex;
    align-items:baseline;
    gap:11px;
    margin-bottom:16px;
    font-family:var(--mono);
  }
  .bundle-price .was{
    font-size:16px;
    color:#8A94AC;
    text-decoration:line-through;
  }
  .bundle-price .now{
    font-family:var(--display);
    font-size:34px;
    font-weight:700;
    color:var(--accent,var(--coral));
    letter-spacing:-0.02em;
  }
  .bundle-price .save{
    font-size:12px;
    font-weight:600;
    color:var(--chalk);
    background:rgba(250,247,240,0.14);
    padding:4px 9px;
    border-radius:100px;
  }
  .bundle-actions{display:flex;gap:10px;flex-wrap:wrap;}
  .bundle-actions .btn-buy,.bundle-actions .btn-ghost{padding:14px 16px;font-size:14px;flex:1 1 auto;}
  .btn-buy{
    flex:1 1 auto;
    background:var(--accent,var(--coral));
    color:var(--ink);
    font-family:var(--body);
    font-weight:800;
    font-size:15px;
    padding:15px 22px;
    border-radius:100px;
    text-decoration:none;
    text-align:center;
    white-space:nowrap;
    border:2px solid var(--accent,var(--coral));
    transition:transform 0.13s ease;
  }
  .btn-buy:hover{transform:translateY(-2px);}
  .btn-ghost{
    flex:0 0 auto;
    background:transparent;
    color:var(--chalk);
    font-family:var(--body);
    font-weight:600;
    font-size:15px;
    padding:15px 22px;
    border-radius:100px;
    text-decoration:none;
    text-align:center;
    white-space:nowrap;
    border:2px solid rgba(250,247,240,0.3);
    transition:border-color 0.13s ease;
  }
  .btn-ghost:hover{border-color:var(--chalk);}

  /* ===== CATALOGUE ===== */
  .cat-group{margin-bottom:56px;}
  .cat-group:last-child{margin-bottom:0;}
  .cat-head{
    display:flex;
    align-items:baseline;
    gap:14px;
    padding-bottom:14px;
    margin-bottom:26px;
    border-bottom:2px solid var(--ink);
  }
  .cat-head h3{
    font-family:var(--display);
    font-size:23px;
    font-weight:700;
    letter-spacing:-0.02em;
  }
  .cat-head .cat-count{
    font-family:var(--mono);
    font-size:13px;
    color:var(--ink-soft);
    margin-left:auto;
    white-space:nowrap;
  }
  .cat-dot{
    width:11px;height:11px;
    border-radius:50%;
    background:var(--accent,var(--coral));
    flex-shrink:0;
  }
  .cat-grid{
    display:grid;
    grid-template-columns:repeat(5,1fr);
    gap:18px;
  }
  @media (max-width: 1180px){ .cat-grid{grid-template-columns:repeat(4,1fr);} }
  @media (max-width: 980px){  .cat-grid{grid-template-columns:repeat(3,1fr);} }
  @media (max-width: 720px){  .cat-grid{grid-template-columns:repeat(2,1fr);} }
  .prod{
    background:#fff;
    border:2px solid var(--ink);
    border-radius:16px;
    padding:15px;
    display:flex;
    flex-direction:column;
    text-decoration:none;
    color:inherit;
    transition:transform 0.14s ease, box-shadow 0.14s ease;
  }
  .prod:hover{
    transform:translateY(-4px);
    box-shadow:6px 8px 0 var(--ink);
  }
  .prod-cover{
    position:relative;
    border-radius:9px;
    overflow:hidden;
    margin-bottom:15px;
    background:var(--chalk-dim);
    aspect-ratio:1/1;
  }
  .prod-cover img{width:100%;height:100%;object-fit:cover;}
  /* A format tag on every cover. The artwork reads as a photograph of a
     physical book, so the format has to sit on the artwork itself — buyers
     were arriving expecting something to be posted to them. */
  .fmt{
    position:absolute;top:9px;right:9px;z-index:2;
    font-family:var(--mono);font-weight:700;font-size:10.5px;
    letter-spacing:0.14em;padding:4px 8px;border-radius:5px;
    background:rgba(12,18,32,.84);color:var(--yellow);
    border:1px solid rgba(255,197,61,.55);
  }
  .hero-fmt{
    margin-top:22px;padding:17px 22px;border-radius:12px;
    background:rgba(255,197,61,.12);border-left:4px solid var(--yellow);
    font-size:16.5px;line-height:1.55;max-width:62ch;
  }
  .hero-fmt strong{font-weight:700;}
  .prod h4{
    font-family:var(--display);
    font-size:16.5px;
    font-weight:700;
    letter-spacing:-0.01em;
    margin-bottom:8px;
    line-height:1.2;
  }
  .prod p{
    font-size:13px;
    line-height:1.55;
    color:var(--ink-soft);
    margin-bottom:16px;
  }
  .prod-foot{
    margin-top:auto;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    font-family:var(--mono);
    font-size:13px;
    padding-top:13px;
    border-top:1px dashed var(--chalk-dim);
  }
  .prod-foot .pages{color:var(--ink-soft);}
  .prod-foot .buy{
    font-weight:700;
    color:var(--ink);
    background:var(--yellow);
    padding:6px 13px;
    border-radius:100px;
    white-space:nowrap;
  }
  .prod:hover .prod-foot .buy{background:var(--coral);color:var(--chalk);}

  /* ===== DEEP DIVE STRIP ===== */
  .deep{
    display:grid;
    grid-template-columns:150px 1fr auto;
    gap:30px;
    align-items:center;
    background:var(--ink);
    color:var(--chalk);
    border-radius:20px;
    padding:32px 34px;
  }
  .deep img{border-radius:9px;width:100%;}
  .deep h3{
    font-family:var(--display);
    font-size:24px;
    font-weight:700;
    letter-spacing:-0.02em;
    margin-bottom:9px;
  }
  .deep p{font-size:14.5px;line-height:1.6;color:#C7CCDB;max-width:52ch;}
  .deep .deep-cta{text-align:right;}
  .deep .deep-price{
    font-family:var(--display);
    font-size:32px;
    font-weight:700;
    color:var(--yellow);
    margin-bottom:12px;
    display:block;
  }

  /* ===== LANGUAGE STRIP ===== */
  .lang{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:28px;
    flex-wrap:wrap;
    border:3px dashed var(--ink);
    border-radius:20px;
    padding:30px 34px;
  }
  .lang h3{
    font-family:var(--display);
    font-size:23px;
    font-weight:700;
    letter-spacing:-0.02em;
    margin-bottom:7px;
  }
  .lang p{font-size:14.5px;color:var(--ink-soft);max-width:56ch;}

  /* ===== RESPONSIVE ===== */
  @media (max-width: 880px){
    .bundles{grid-template-columns:1fr;}
    .deep{grid-template-columns:1fr;text-align:left;}
    .deep img{max-width:130px;}
    .deep .deep-cta{text-align:left;}
    .nav-links{display:none;}

  }
  @media (max-width: 540px){
    .bundle{padding:26px 22px;}
    .bundle-cover{width:84px;}
    .bundle h2{font-size:26px;}
    .cat-grid{grid-template-columns:1fr;}
    .lang{padding:24px 22px;}
  }

  /* the two price spans need breathing room when emitted adjacent */
  .price-tag{display:flex;align-items:baseline;gap:10px;}