:root{
  --bg:#0b0908;
  --black:#070605;
  --ink:#18130f;

  --paper:#eee4d2;
  --paper-soft:#f5ead6;
  --paper2:#e3d4ba;

  --gold:#c7a064;
  --gold2:#e2c38a;

  --red:#7a241d;
  --red2:#4b1210;

  --muted:#9c8f7a;

  --text:#f4ead8;

  --line:rgba(255,255,255,.10);
  --line-dark:rgba(24,19,15,.16);

  --shadow:0 40px 100px rgba(0,0,0,.32);
}

*{
  box-sizing:border-box;
}

html{
  scroll-behavior:smooth;
  scroll-padding-top:82px;
}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:Georgia,'Times New Roman',serif;
  line-height:1.65;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:50;
  pointer-events:none;

  background:
    linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px);

  background-size:100% 4px;

  mix-blend-mode:overlay;

  opacity:.14;
}

a{
  color:inherit;
  text-decoration:none;
}

img{
  display:block;
  max-width:100%;
}

/* ===================================================== */
/* HEADER */
/* ===================================================== */

.site-header{
  position:sticky;
  top:0;
  z-index:100;

  background:#120d0a;

  border-bottom:1px solid rgba(226,195,138,.18);

  box-shadow:0 14px 35px rgba(0,0,0,.25);
}

.nav{
  height:82px;

  display:flex;
  align-items:center;
  justify-content:space-between;

  padding:0 5vw;

  background:#120d0a;

  color:#f4ead8;
}

.seal{
  width:44px;
  height:44px;

  display:grid;
  place-items:center;

  border:2px solid rgba(226,195,138,.75);

  color:#e8d3a7;

  font-size:22px;
  font-weight:700;

  background:rgba(0,0,0,.22);
}

.nav-links{
  display:flex;
  align-items:center;
  gap:28px;

  font-family:Arial,sans-serif;

  text-transform:uppercase;
  letter-spacing:.12em;

  font-size:12px;
}

.nav-links a{
  position:relative;
  opacity:.92;
}

.nav-links a::after{
  content:"";

  position:absolute;
  left:0;
  bottom:-8px;

  width:0;
  height:1px;

  background:var(--gold2);

  transition:.25s ease;
}

.nav-links a:hover::after{
  width:100%;
}

.nav-buy{
  background:rgba(122,36,29,.95);

  color:#fff !important;

  padding:12px 18px;

  border:1px solid rgba(226,195,138,.12);
}

.menu-toggle{
  display:none;

  background:none;
  border:0;

  color:#f4ead8;

  font-size:28px;

  cursor:pointer;
}

/* ===================================================== */
/* HERO */
/* ===================================================== */

.hero-cover{
  position:relative;

  width:100%;

  overflow:hidden;

  background:#0d0a08;
}

.hero-cover-img{
  width:100%;
  display:block;
}

.hero-overlay-buttons{
  position:absolute;

  left:12%;
  bottom:9.5%;

  z-index:6;

  display:flex;
  flex-direction:column;

  gap:14px;
}

.hero-overlay-btn{
  width:310px;
  min-height:54px;

  display:flex;
  align-items:center;
  justify-content:center;

  padding:14px 28px;

  font-family:Arial,sans-serif;

  font-size:13px;
  font-weight:700;

  letter-spacing:.09em;
  text-transform:uppercase;

  border-radius:3px;

  transition:.25s ease;

  box-shadow:
    0 20px 55px rgba(0,0,0,.48),
    inset 0 1px 0 rgba(255,255,255,.08);
}

.hero-overlay-light{
  background:#120d0a;

  color:#f6ead5;

  border:1px solid rgba(226,195,138,.55);
}

.hero-overlay-red{
  background:#6f1813;

  color:#fff;

  border:1px solid rgba(255,255,255,.10);
}

.hero-overlay-btn:hover{
  transform:translateY(-2px);

  filter:brightness(1.12);
}

/* ===================================================== */
/* TEXTOS GENERALES */
/* ===================================================== */

.section-mini,
.eyebrow{
  font-family:Arial,sans-serif;

  text-transform:uppercase;

  letter-spacing:.2em;

  font-size:12px;

  color:var(--red);

  font-weight:700;
}

.section-mini.dark{
  color:#7f342b;
}

.classic-copy h2,
.commented-copy h2,
.section-center h2,
.buy-copy h2{
  font-size:clamp(38px,5vw,78px);

  line-height:1.02;

  margin:20px 0 28px;

  font-weight:400;
}

/* ===================================================== */
/* CLASSIC */
/* ===================================================== */

.classic{
  background:var(--paper-soft);

  color:var(--ink);

  display:grid;
  grid-template-columns:.82fr 1.18fr;

  gap:6vw;

  align-items:center;

  padding:110px 6vw;

  position:relative;

  overflow:hidden;
}

.classic::before{
  content:"";

  position:absolute;
  inset:0;

  pointer-events:none;

  background:
    radial-gradient(circle at 82% 18%,rgba(122,36,29,.10),transparent 28%),
    linear-gradient(180deg,rgba(255,255,255,.35),transparent);
}

.classic-image,
.classic-copy{
  position:relative;
  z-index:1;
}

.classic-image img{
  box-shadow:0 30px 80px rgba(70,45,25,.20);

  border:1px solid rgba(24,19,15,.12);
}

.classic-copy p{
  font-size:20px;

  color:#413629;

  margin:0 0 22px;

  max-width:860px;
}

.classic-copy strong{
  color:#111;
}

.strategy-note{
  margin-top:32px;

  padding:18px 22px;

  border-left:3px solid var(--red);

  background:rgba(255,255,255,.46);

  color:#2b1b12;

  font-size:1.05rem;

  line-height:1.5;

  box-shadow:0 18px 40px rgba(70,45,25,.12);
}

/* ===================================================== */
/* COMMENTED */
/* ===================================================== */

.commented{
  background:var(--paper);

  color:var(--ink);

  display:grid;
  grid-template-columns:.95fr 1.05fr;

  align-items:center;

  gap:5vw;

  padding:112px 6vw;
}

.commented-copy p{
  font-size:20px;

  color:#413629;

  margin:0 0 22px;

  max-width:860px;
}

.commented-image img{
  box-shadow:0 22px 70px rgba(24,19,15,.16);

  border:1px solid rgba(24,19,15,.14);
}

.annotations{
  display:grid;

  grid-template-columns:1fr 1fr;

  gap:12px 18px;

  margin:30px 0 0;

  padding:0;

  list-style:none;
}

.annotations li{
  border-left:3px solid var(--red);

  padding:8px 0 8px 14px;

  font-style:italic;

  color:#513f31;
}

/* ===================================================== */
/* CHAPTERS */
/* ===================================================== */

.chapters{
  background:
    radial-gradient(circle at 70% 0,rgba(122,36,29,.18),transparent 24%),
    #080706;

  padding:120px 6vw;
}

.section-center{
  text-align:center;

  max-width:980px;

  margin:0 auto 70px;
}

.strategy-lead{
  font-size:21px;

  color:#bba991;

  max-width:760px;

  margin:0 auto;
}

.chapters-grid{
  max-width:1240px;

  margin:0 auto;

  display:grid;

  grid-template-columns:repeat(4,1fr);

  gap:20px;
}

/* TARJETAS */

.chapter-card{
  position:relative;

  height:240px;

  perspective:1400px;
}

.chapter-inner{
  position:relative;

  width:100%;
  height:100%;

  transform-style:preserve-3d;

  transition:transform .9s cubic-bezier(.2,.7,.2,1);
}

.chapter-card:hover .chapter-inner{
  transform:rotateY(180deg);
}

/* CARAS */

.chapter-front,
.chapter-back{
  position:absolute;

  inset:0;

  width:100%;
  height:100%;

  padding:28px 24px;

  backface-visibility:hidden;
  -webkit-backface-visibility:hidden;

  border:1px solid rgba(199,160,100,.18);

  overflow:hidden;
}

.chapter-front{
  z-index:2;

  background:
    linear-gradient(180deg,#151210,#0d0b0a);

  display:flex;
  flex-direction:column;
}

.chapter-front::after{
  content:"";

  position:absolute;

  right:-35px;
  bottom:-35px;

  width:90px;
  height:90px;

  border:1px solid rgba(122,36,29,.35);

  border-radius:50%;
}

.chapter-front span{
  color:var(--red);

  font-family:Arial,sans-serif;

  font-size:14px;

  letter-spacing:.16em;
}

.chapter-front h3{
  margin-top:18px;

  font-size:24px;

  line-height:1.15;

  color:#f0e4d0;

  font-weight:400;
}

/* REVERSO */

.chapter-back{
  transform:rotateY(180deg);

  display:flex;
  flex-direction:column;
  justify-content:center;

  background:
    linear-gradient(180deg,#1b1511,#120d0a);
}

.chapter-back h4{
  margin:0 0 14px;

  color:var(--gold2);

  font-size:21px;

  line-height:1.2;

  font-weight:400;
}

.chapter-back p{
  margin:0;

  color:#d7c7b0;

  font-size:15px;

  line-height:1.55;
}

.final-chapter{
  grid-column:2 / span 2;
}

/* ===================================================== */
/* STRATEGY */
/* ===================================================== */

.strategy{
  background:var(--paper);

  color:var(--ink);

  padding:112px 6vw;
}

.dark-text h2{
  color:#111;
}

.strategy-grid{
  max-width:1180px;

  margin:50px auto 0;

  display:grid;

  grid-template-columns:repeat(5,1fr);

  gap:24px;
}

.strategy-grid article{
  text-align:center;

  border-top:1px solid rgba(24,19,15,.18);

  padding:28px 12px;
}

.strategy-grid span{
  font-size:38px;

  color:var(--red);
}

.strategy-grid h3{
  font-size:25px;

  margin:16px 0 8px;
}

.strategy-grid p{
  font-size:15px;

  color:#4d4135;

  margin:0;
}

/* ===================================================== */
/* BUY */
/* ===================================================== */

.buy{

  position:relative;

  width:100%;

  min-height:720px;

  overflow:hidden;

  display:flex;

  align-items:center;

  background:#2a0606;

}

.buy-bg{

  position:absolute;

  inset:0;

  width:100%;

  height:100%;

}

.buy-bg img{

  width:100%;

  height:100%;

  object-fit:cover;

  object-position:center;

  filter:brightness(.82);

}

.buy-overlay{

  position:absolute;

  inset:0;

  background:

    linear-gradient(

      90deg,

      rgba(15,7,5,.88) 0%,

      rgba(15,7,5,.68) 32%,

      rgba(15,7,5,.22) 58%,

      rgba(15,7,5,.12) 100%

    );

}

.buy-content{

  position:relative;

  z-index:5;

  max-width:620px;

  padding-left:8vw;

}

.gold-light{

  color:#d7a86e;

  font-family:Arial,sans-serif;

  text-transform:uppercase;

  letter-spacing:.18em;

  font-size:12px;

  margin-bottom:18px;

}

.buy-copy h2{

  font-size:clamp(52px,5vw,88px);

  line-height:.95;

  color:#f4ead8;

  margin:0 0 28px;

  font-weight:400;

}

.buy-copy p{

  font-size:21px;

  line-height:1.7;

  color:#eadcc7;

  max-width:560px;

}

.buy-btn{

  display:inline-flex;

  align-items:center;

  justify-content:center;

  margin-top:34px;

  min-height:58px;

  padding:0 34px;

  background:#8e2118;

  color:#fff;

  border:1px solid rgba(255,255,255,.10);

  font-family:Arial,sans-serif;

  text-transform:uppercase;

  letter-spacing:.12em;

  font-size:12px;

  font-weight:700;

  transition:.25s ease;

}

.buy-btn:hover{

  transform:translateY(-2px);

  background:#a2261d;

}

@media(max-width:900px){

  .buy{

    min-height:auto;

  }

  .buy-overlay{

    background:

      linear-gradient(

        180deg,

        rgba(10,6,5,.78) 0%,

        rgba(10,6,5,.84) 100%

      );

  }

  .buy-content{

    padding:80px 6vw;

    max-width:100%;

  }

  .buy-copy h2{

    font-size:52px;

  }

  .buy-copy p{

    font-size:18px;

  }

  .buy-btn{

    width:100%;

  }

}
/* LEGACY SECTION */

.legacy-section{
  background:#efe4d0;
  color:#18130f;
  padding:110px 6vw;
}

.legacy-copy{
  max-width:900px;
  margin:0 auto 70px;
  text-align:center;
}

.legacy-copy h2{
  font-size:clamp(42px,5vw,78px);
  line-height:1.02;
  margin:20px 0 28px;
  font-weight:400;
}

.legacy-copy p{
  font-size:20px;
  color:#413629;
  max-width:760px;
  margin:0 auto 22px;
}

.legacy-books{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:50px;
  flex-wrap:wrap;
}

.legacy-book{
  text-align:center;
}

.legacy-book img{
  width:280px;
  border-radius:4px;
  box-shadow:0 30px 80px rgba(0,0,0,.18);
  transition:.35s ease;
}

.old-book img{
  transform:rotate(-6deg);
  opacity:.88;
}

.new-book img{
  transform:rotate(5deg) scale(1.04);
}

.legacy-book img:hover{
  transform:scale(1.05);
}

.legacy-book span{
  display:block;
  margin-top:18px;
  font-family:Arial,sans-serif;
  text-transform:uppercase;
  letter-spacing:.14em;
  font-size:11px;
  color:#7b5d3b;
}

.legacy-arrow{
  font-size:70px;
  color:#9f7a4d;
  font-weight:300;
}

@media(max-width:900px){

  .legacy-books{
    flex-direction:column;
    gap:28px;
  }

  .legacy-arrow{
    transform:rotate(90deg);
    font-size:50px;
  }

  .legacy-book img{
    width:220px;
  }

}
/* ===================================================== */
/* FOOTER */
/* ===================================================== */

.footer{
  background:#050505;

  color:#9d8f78;

  text-align:center;

  padding:34px 5vw;

  font-family:Arial,sans-serif;

  font-size:13px;
}

.footer a{
  text-decoration:underline;

  text-underline-offset:4px;

  color:#d7cbb8;
}

/* ===================================================== */
/* REVEAL */
/* ===================================================== */

.reveal{
  opacity:0;

  transform:translateY(24px);

  transition:
    opacity .7s ease,
    transform .7s ease;
}

.reveal.visible{
  opacity:1;

  transform:translateY(0);
}

.delay-1{
  transition-delay:.12s;
}

.delay-2{
  transition-delay:.22s;
}

/* ===================================================== */
/* RESPONSIVE */
/* ===================================================== */

@media(max-width:1180px){

  .chapters-grid{
    grid-template-columns:repeat(3,1fr);
  }

  .strategy-grid{
    grid-template-columns:repeat(3,1fr);
  }

}

@media(max-width:900px){

  html{
    scroll-padding-top:74px;
  }

  .nav{
    height:74px;
  }

  .menu-toggle{
    display:block;
  }

  .nav-links{
    position:absolute;

    top:100%;
    left:0;
    right:0;

    display:none;

    flex-direction:column;

    align-items:flex-start;

    padding:18px 5vw;

    background:#120d0a;

    border-top:1px solid rgba(255,255,255,.12);
  }

  .nav-links.open{
    display:flex;
  }

  .hero-cover-img{
    width:100%;
    height:auto;
  }

  .hero-overlay-buttons{
    position:static;

    width:100%;

    padding:18px 5vw 24px;

    background:#120d0a;
  }

  .hero-overlay-btn{
    width:100%;
  }

  .classic,
  .commented,
  .buy-content{
    grid-template-columns:1fr;
  }

  .classic,
  .commented,
  .chapters,
  .strategy,
  .buy{
    padding:78px 5vw;
  }

  .chapters-grid,
  .strategy-grid{
    grid-template-columns:1fr 1fr;
  }

  .final-chapter{
    grid-column:auto;
  }

  .annotations{
    grid-template-columns:1fr;
  }

  .buy-content{
    gap:36px;
  }

  .buy-cover{
    max-width:260px;

    margin:0 auto;
  }

  .chapter-card{
    height:260px;
  }

}

@media(max-width:560px){

.seal{

  width:44px;

  height:44px;

  display:flex;

  align-items:center;

  justify-content:center;

  background:#5b1716;

  border:1px solid rgba(226,195,138,.35);

  color:#f3d7c2;

  font-size:24px;

  font-weight:700;

  border-radius:3px;

  box-shadow:

    0 10px 24px rgba(0,0,0,.28),

    inset 0 1px 0 rgba(255,255,255,.06);

  transition:.25s ease;

}
.seal-kanji{

  font-family:

    "Noto Serif SC",

    "Songti SC",

    serif;

}

.seal:hover{

  transform:translateY(-2px);

  background:#71201d;

}
  .chapters-grid,
  .strategy-grid{
    grid-template-columns:1fr;
  }

  .classic-copy h2,
  .commented-copy h2,
  .section-center h2,
  .buy-copy h2{
    font-size:42px;
  }

  .classic-copy p,
  .commented-copy p,
  .buy-copy p{
    font-size:18px;
  }

  .buy-btn{
    width:100%;

    justify-content:center;
  }
.chapter-card.flipped .chapter-inner {
  transform: rotateY(180deg);
}
}