:root{
    --paper:#f7f1e2;
    --paper-alt:#efe4c9;
    --ink:#1d1710;
    --ink-soft:#5a5138;
    --navy:#0e1a2e;
    --navy-soft:#16233c;
    --gold:#a9822f;
    --gold-text:#7c5e1a;
    --gold-soft:#e0c68d;
    --cream-text:#f2ead9;
    --cream-text-soft:#cabb9c;
    --line:#ddcda0;
    --line-on-navy:rgba(242,234,217,.16);
    --accent:#b5502e;
    --accent-contrast:#ffffff;
    --shadow: 0 30px 60px -20px rgba(14,26,46,.35);
  }
  @media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]){
      --paper:#0f1928;
      --paper-alt:#0a1220;
      --ink:#f0e9d8;
      --ink-soft:#b9ad8e;
      --navy:#070d18;
      --navy-soft:#0d1626;
      --gold:#ddbf82;
      --gold-text:#ddbf82;
      --gold-soft:#e9d3a0;
      --cream-text:#f2ead9;
      --cream-text-soft:#b9ad8e;
      --line:rgba(240,233,216,.14);
      --line-on-navy:rgba(240,233,216,.14);
      --accent:#e2814f;
      --accent-contrast:#070d18;
      --shadow: 0 30px 70px -20px rgba(0,0,0,.6);
    }
  }
  :root[data-theme="dark"]{
    --paper:#0f1928;
    --paper-alt:#0a1220;
    --ink:#f0e9d8;
    --ink-soft:#b9ad8e;
    --navy:#070d18;
    --navy-soft:#0d1626;
    --gold:#ddbf82;
    --gold-text:#ddbf82;
    --gold-soft:#e9d3a0;
    --cream-text:#f2ead9;
    --cream-text-soft:#b9ad8e;
    --line:rgba(240,233,216,.14);
    --line-on-navy:rgba(240,233,216,.14);
    --accent:#e2814f;
    --accent-contrast:#070d18;
    --shadow: 0 30px 70px -20px rgba(0,0,0,.6);
  }

  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:"Libre Franklin", -apple-system, "Segoe UI", sans-serif;
    -webkit-font-smoothing:antialiased;
    padding-inline:0;
  }
  .wrap{max-width:1120px;margin-inline:auto;padding-inline:24px;}
  img{max-width:100%;display:block;}
  h1,h2,h3{font-family:"Cormorant Garamond", Georgia, serif; font-weight:600; text-wrap:balance; margin:0;}
  a{color:inherit;}
  .faq-item p a{color:var(--gold-text); font-weight:600;}
  .eyebrow{
    font-family:"Libre Franklin", sans-serif;
    text-transform:uppercase;
    letter-spacing:.16em;
    font-size:.72rem;
    font-weight:600;
    color:var(--gold-text);
  }
  .eyebrow.on-navy{color:var(--gold-soft);}

  /* ---------- nav ---------- */
  nav{
    position:sticky; top:0; z-index:20;
    background:color-mix(in srgb, var(--paper) 88%, transparent);
    backdrop-filter:blur(8px);
    border-bottom:1px solid var(--line);
  }
  .nav-inner{
    max-width:1120px;margin-inline:auto;padding:16px 24px;
    display:flex;align-items:center;justify-content:space-between;gap:16px;
  }
  .brand{font-family:"Cormorant Garamond",serif; font-size:1.25rem; font-weight:600; letter-spacing:.02em; text-decoration:none;}
  .brand span{color:var(--gold); font-style:italic; font-weight:500;}
  .nav-links{display:flex;gap:28px;list-style:none;margin:0;padding:0;font-size:.88rem;}
  .nav-links a{text-decoration:none;color:var(--ink-soft);}
  .nav-links a:hover{color:var(--gold);}
  .nav-cta{
    font-size:.82rem;font-weight:600;text-decoration:none;
    color:var(--navy); background:var(--gold-soft);
    padding:9px 18px;border-radius:999px;white-space:nowrap;
  }
  @media (max-width:640px){ .nav-links{display:none;} }

  /* ---------- hero ---------- */
  .hero{
    background:linear-gradient(180deg, var(--navy) 0%, var(--navy-soft) 100%);
    color:var(--cream-text);
    padding-block:72px 88px;
  }
  .hero-grid{
    display:grid; grid-template-columns:1fr 1.15fr; gap:56px; align-items:center;
  }
  @media (max-width:820px){ .hero-grid{grid-template-columns:1fr; gap:40px;} .hero{padding-block:48px 56px;} }
  .hero-copy .eyebrow{margin-bottom:18px; display:block;}
  .hero h1{
    font-size:clamp(3.4rem, 9vw, 5.6rem);
    line-height:.92;
    color:var(--cream-text);
  }
  .hero .subtitle{
    font-family:"Cormorant Garamond",serif;
    font-style:italic; font-weight:500;
    font-size:clamp(1.3rem,3vw,1.7rem);
    color:var(--gold-soft);
    margin-top:6px;
  }
  .hero .thesis{
    margin-top:28px;
    font-family:"Cormorant Garamond",serif;
    font-size:clamp(1.4rem,2.6vw,1.85rem);
    line-height:1.35;
    max-width:30ch;
  }
  .hero p.lead{
    margin-top:20px; max-width:46ch;
    color:var(--cream-text-soft);
    font-size:1.02rem; line-height:1.65;
  }
  .release-badge{
    display:inline-block; margin-top:24px; padding:7px 16px;
    border:1px solid var(--gold-soft); border-radius:999px;
    color:var(--gold-soft); font-size:.82rem; font-weight:600; letter-spacing:.01em;
  }
  .cta-row{display:flex; flex-wrap:wrap; align-items:center; gap:22px; margin-top:34px;}
  .btn-primary{
    display:inline-block; text-decoration:none;
    background:var(--gold-soft); color:var(--navy);
    font-weight:700; font-size:.94rem;
    padding:15px 30px; border-radius:999px;
    box-shadow:var(--shadow);
    transition:transform .15s ease;
  }
  .btn-primary:hover{transform:translateY(-2px);}
  .link-arrow{font-size:.92rem; font-weight:600; text-decoration:none; color:var(--cream-text-soft); border-bottom:1px solid var(--line-on-navy); padding-bottom:2px;}
  .link-arrow:hover{color:var(--gold-soft); border-color:var(--gold-soft);}

  .hero-art{position:relative; display:flex; justify-content:center;}
  .book-cover{
    width:min(320px, 80%);
    height:auto;
    border-radius:3px;
    box-shadow:0 40px 80px -24px rgba(0,0,0,.55), 0 4px 18px rgba(0,0,0,.35);
    transform:rotate(-2.2deg);
  }
  .hero-art::before{
    content:"";
    position:absolute; inset:-6% -10%;
    background:radial-gradient(closest-side, rgba(224,198,141,.16), transparent 70%);
    z-index:-1;
  }

  /* ---------- press strip ---------- */
  .press{
    background:var(--navy-soft);
    color:var(--cream-text);
    border-top:1px solid var(--line-on-navy);
    padding-block:40px;
  }
  .press blockquote{
    margin:0; font-family:"Cormorant Garamond",serif; font-style:italic;
    font-size:clamp(1.15rem,2.3vw,1.45rem); line-height:1.55;
    max-width:56ch;
  }
  .press .eyebrow{margin-bottom:12px;}

  /* ---------- section shell ---------- */
  section{padding-block:88px;}
  .section-head{max-width:44ch; margin-bottom:44px;}
  .section-head h2{font-size:clamp(2.1rem,4vw,2.7rem); margin-top:10px;}
  .section-head .eyebrow{display:block;}

  /* ---------- testimonios ---------- */
  .testimonios{background:var(--paper-alt); border-top:1px solid var(--line);}
  .testimonios-grid{
    display:grid; grid-template-columns:repeat(auto-fit, minmax(260px, 1fr));
    gap:20px; align-items:stretch;
  }
  .testimonio-card{
    margin:0; background:var(--paper); border:1px solid var(--line); border-radius:12px;
    padding:22px 24px; display:flex; flex-direction:column; gap:14px;
  }
  .testimonio-card p{
    margin:0; font-family:"Cormorant Garamond",serif; font-style:italic;
    font-size:1.12rem; line-height:1.55; color:var(--ink);
  }
  .testimonio-card cite{
    margin-top:auto; font-family:"Libre Franklin",sans-serif; font-style:normal;
    font-size:.84rem; font-weight:600; color:var(--gold-text);
  }

  /* ---------- sinopsis ---------- */
  .sinopsis{background:var(--paper);}
  .sinopsis-grid{display:grid; grid-template-columns:.9fr 1.5fr; gap:56px;}
  @media (max-width:820px){ .sinopsis-grid{grid-template-columns:1fr;} }
  .pull{
    font-family:"Cormorant Garamond",serif; font-style:italic; font-weight:500;
    color:var(--gold); font-size:clamp(1.6rem,3vw,2.05rem); line-height:1.3;
    position:sticky; top:110px;
  }
  .sinopsis-body p{
    font-size:1.05rem; line-height:1.75; color:var(--ink-soft);
    max-width:62ch; margin:0 0 22px;
  }
  .sinopsis-body p:last-child{
    margin-top:32px; font-family:"Cormorant Garamond",serif; font-style:italic;
    color:var(--ink); font-size:1.35rem; line-height:1.5; max-width:34ch;
  }

  /* ---------- beneficios ---------- */
  .beneficios{background:var(--paper);}
  .beneficios-grid{
    display:grid; grid-template-columns:1fr 1fr; gap:16px 28px; margin-top:20px;
  }
  @media (max-width:640px){ .beneficios-grid{grid-template-columns:1fr;} }
  .beneficio{
    display:flex; gap:14px; align-items:flex-start;
    padding:20px 0; border-bottom:1px solid var(--line);
  }
  .beneficio .mark{
    flex:none; width:26px; height:26px; border-radius:50%;
    border:1.5px solid var(--gold); color:var(--gold-text);
    display:flex; align-items:center; justify-content:center;
    font-size:.8rem; font-weight:700; margin-top:2px;
  }
  .beneficio p{margin:0; font-size:1rem; line-height:1.6; color:var(--ink-soft);}
  .beneficio strong{color:var(--ink); font-weight:600;}

  /* ---------- mid cta band ---------- */
  .cta-band{
    background:var(--navy-soft); color:var(--cream-text);
    border-top:1px solid var(--line-on-navy); border-bottom:1px solid var(--line-on-navy);
    padding-block:34px;
  }
  .cta-band .wrap{display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:20px;}
  .cta-band p{
    margin:0; font-family:"Cormorant Garamond",serif; font-style:italic;
    font-size:1.3rem; max-width:36ch; color:var(--cream-text);
  }

  /* ---------- metodo ---------- */
  .metodo{background:var(--paper-alt); border-top:1px solid var(--line); border-bottom:1px solid var(--line);}
  .tree{
    position:relative; margin-top:20px; max-width:760px;
  }
  .tree::before{
    content:""; position:absolute; left:15px; top:6px; bottom:6px; width:2px;
    background:linear-gradient(180deg, var(--gold) 0%, var(--line) 100%);
    opacity:.55;
  }
  .tree-node{
    position:relative; padding-left:56px; padding-bottom:44px;
  }
  .tree-node:last-child{padding-bottom:0;}
  .tree-node::before{
    content:""; position:absolute; left:6px; top:4px; width:20px; height:20px;
    border-radius:50%; background:var(--paper-alt);
    border:2px solid var(--gold);
  }
  .tree-node .tag{
    font-family:"Libre Franklin",sans-serif; text-transform:uppercase;
    letter-spacing:.14em; font-size:.7rem; font-weight:700; color:var(--gold-text);
  }
  .tree-node h3{font-size:1.5rem; margin-top:6px;}
  .tree-node p{margin:8px 0 0; color:var(--ink-soft); font-size:1rem; line-height:1.65; max-width:56ch;}

  /* ---------- autor ---------- */
  .opinion-banner{background:var(--navy); border-top:1px solid var(--line-on-navy); border-bottom:1px solid var(--line-on-navy);}
  .opinion-banner-inner{
    display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between;
    gap:24px; padding-block:30px;
  }
  .btn-highlight{
    display:inline-block; flex-shrink:0; text-decoration:none; white-space:nowrap;
    background:var(--accent); color:var(--accent-contrast);
    font-weight:700; font-size:.94rem;
    padding:15px 26px; border-radius:999px;
    box-shadow:0 14px 30px -12px rgba(181,80,46,.55);
    transition:transform .15s ease;
  }
  .btn-highlight:hover{transform:translateY(-2px);}
  .comentarios{background:var(--navy); color:var(--cream-text); border-top:1px solid var(--line-on-navy);}
  .comentarios-grid{display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:start;}
  @media (max-width:820px){ .comentarios-grid{grid-template-columns:1fr;} }
  .autor{background:var(--navy); color:var(--cream-text);}
  .autor-grid{display:grid; grid-template-columns:.85fr 1.4fr; gap:60px; align-items:start;}
  @media (max-width:820px){ .autor-grid{grid-template-columns:1fr; gap:32px;} }
  .autor-photo{margin-bottom:28px; max-width:280px;}
  .autor-photo img{
    width:100%; height:auto; display:block; border-radius:2px;
    box-shadow:0 18px 40px -12px rgba(0,0,0,.55);
  }
  @media (max-width:820px){ .autor-photo{margin-inline:auto;} }
  .autor h2{color:var(--cream-text); font-size:clamp(2rem,4vw,2.6rem);}
  .autor .role{color:var(--gold-soft); font-size:1.02rem; margin-top:10px; max-width:32ch; line-height:1.5;}
  .chips{display:flex; flex-wrap:wrap; gap:10px; margin-top:24px;}
  .chip{
    font-size:.76rem; font-weight:600; letter-spacing:.02em;
    border:1px solid var(--line-on-navy); color:var(--cream-text-soft);
    padding:7px 14px; border-radius:999px;
  }
  .autor-body p{font-size:1.03rem; line-height:1.75; color:var(--cream-text-soft); max-width:64ch; margin:0 0 20px;}
  .autor-body .short-bio{
    margin-top:28px; font-family:"Cormorant Garamond",serif; font-style:italic;
    color:var(--cream-text); font-size:1.3rem; line-height:1.55; max-width:42ch;
    border-left:2px solid var(--gold-soft); padding-left:20px;
  }

  /* ---------- faq ---------- */
  .faq{background:var(--paper-alt); border-top:1px solid var(--line);}
  .faq-list{margin-top:8px; max-width:760px;}
  .faq-item{border-bottom:1px solid var(--line); padding:22px 0;}
  .faq-item h3{font-family:"Libre Franklin",sans-serif; font-weight:700; font-size:1.05rem; color:var(--ink);}
  .faq-item p{margin:10px 0 0; color:var(--ink-soft); font-size:.98rem; line-height:1.65; max-width:64ch;}

  /* ---------- reserva ---------- */
  .reserva{background:var(--paper);}
  .reserva-grid{display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:start;}
  @media (max-width:820px){ .reserva-grid{grid-template-columns:1fr;} }
  .reserva p.lead{font-size:1.05rem; line-height:1.7; color:var(--ink-soft); max-width:48ch;}
  .amazon-callout{
    background:var(--paper-alt); border:1px solid var(--gold);
    border-radius:10px; padding:22px 24px; margin-bottom:22px;
  }
  .amazon-callout-label{
    display:block; font-size:.76rem; font-weight:700; letter-spacing:.06em;
    text-transform:uppercase; color:var(--gold-text); margin-bottom:12px;
  }
  .amazon-callout .btn-primary{display:inline-block; width:100%; text-align:center; box-sizing:border-box;}
  .or-divider{
    text-align:center; font-size:.85rem; color:var(--ink-soft);
    margin:0 0 22px;
  }
  .note{
    margin-top:18px; font-size:.9rem; color:var(--ink-soft);
    border-left:2px solid var(--gold); padding-left:16px; max-width:44ch; line-height:1.6;
  }
  form{
    background:var(--paper-alt); border:1px solid var(--line); border-radius:14px;
    padding:32px; display:flex; flex-direction:column; gap:18px;
  }
  .field label{display:block; font-size:.82rem; font-weight:600; margin-bottom:8px; color:var(--ink);}
  .field-hint{margin:6px 0 0; font-size:.78rem; line-height:1.4; color:var(--gold-text); font-weight:600;}
  .field input[type="email"],
  .field input[type="text"],
  .field textarea{
    width:100%; padding:13px 14px; border-radius:8px; border:1px solid var(--line);
    background:var(--paper); color:var(--ink); font-size:1rem; font-family:inherit;
    box-sizing:border-box; resize:vertical;
  }
  .field input[type="email"]:focus,
  .field input[type="text"]:focus,
  .field textarea:focus{outline:2px solid var(--gold); outline-offset:1px;}
  .consent-check{
    display:flex; align-items:flex-start; gap:10px; margin:4px 0 20px;
    font-size:.88rem; line-height:1.5; color:var(--ink); cursor:pointer;
  }
  .consent-check input{accent-color:var(--gold-soft); margin-top:3px; flex-shrink:0;}
  .hp-field{position:absolute; left:-9999px; width:1px; height:1px; overflow:hidden;}
  .radio-group{display:flex; flex-wrap:wrap; gap:10px;}
  .radio-group label{
    display:flex; align-items:center; gap:8px;
    border:1px solid var(--line); border-radius:999px; padding:9px 16px;
    font-size:.88rem; color:var(--ink-soft); cursor:pointer; font-weight:500;
  }
  .radio-group input{accent-color:var(--gold);}
  .submit-btn{
    background:var(--gold); color:var(--navy); border:none; border-radius:999px;
    padding:15px 20px; font-weight:700; font-size:.96rem; cursor:pointer; font-family:inherit;
  }
  .submit-btn:hover{background:var(--gold-soft);}
  .alt-contact{margin-top:16px; font-size:.88rem; color:var(--ink-soft);}
  .alt-contact a{color:var(--gold); text-decoration:none; font-weight:600;}
  .form-success{display:none; padding:32px; border-radius:14px; background:var(--paper-alt); border:1px solid var(--line); color:var(--ink);}
  .form-success h3{font-size:1.4rem; margin-bottom:10px; color:var(--ink);}
  .form-success p{color:var(--ink-soft); font-size:.98rem; line-height:1.6; margin:0;}

  /* ---------- footer ---------- */
  footer{
    background:var(--navy); color:var(--cream-text-soft);
    padding-block:40px; border-top:1px solid var(--line-on-navy);
  }
  .footer-inner{display:flex; flex-wrap:wrap; justify-content:space-between; gap:16px; align-items:center; font-size:.85rem;}
  .footer-inner .brand{color:var(--cream-text);}
  .footer-inner .brand span{color:var(--gold-soft);}
  .registro-link{color:var(--cream-text-soft); opacity:.75; font-size:.78rem; text-decoration:none; border-bottom:1px solid transparent;}
  .registro-link:hover, .registro-link:focus-visible{opacity:1; border-bottom-color:currentColor;}