:root {
  --black: #0b0b0b;
  --black-soft: #111;
  --white: #ffffff;
  --gray: #bfbfbf;
  --gray-soft: #8a8a8a;
  --gold: #c9a24d;
}

/* RESET */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* BASE */
body {
  font-family: 'Inter', sans-serif;
  background: var(--black);
  color: var(--white);
  line-height: 1.6;
}

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

.header {
  position: fixed;
  top: 0;
  width: 100%;
  min-height: 124px;                 /* igual al logo */
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 60px;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(10px);
  z-index: 100;
}

/* LOGO exacto */
.logo img {
  width: 228px;
  height: 124px;
  display: block;
}

/* NAV */
.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav a {
  text-decoration: none;
  color: var(--gray);
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: color .3s ease;
}

.nav a:hover {
  color: var(--gold);
}

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

.hero {
  min-height: 100vh;
  padding: 160px 60px 60px; /* deja espacio al header */
  background:
    linear-gradient(rgba(0,0,0,.65), rgba(0,0,0,.9)),
    url('https://images.unsplash.com/photo-1495446815901-a7297e633e8d') center/cover;
  display: flex;
  align-items: center;
}

.hero-content {
  max-width: 620px;
}

.hero h1 {
  font-family: 'Playfair Display', serif;
  font-size: 52px;
  line-height: 1.2;
  font-weight: 600;
}

.hero h1 span {
  color: var(--gold);
  font-weight: 400;
}

.hero p {
  margin: 24px 0;
  color: var(--gray);
  font-size: 16px;
}

/* ================= BOTONES ================= */

.btn {
  display: inline-block;
  padding: 14px 36px;
  background: var(--gold);
  color: #000;
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.05em;
  transition: all .3s ease;
}

.btn:hover {
  background: #b08e3e;
}

.btn.secondary {
  background: transparent;
  border: 1px solid var(--gold);
  color: var(--gold);
}

.btn.secondary:hover {
  background: var(--gold);
  color: #000;
}

/* ================= SECCIONES ================= */

.section {
  padding: 120px 60px;
  text-align: center;
}

.section.dark {
  background: #050505;
}

.section h2 {
  font-family: 'Playfair Display', serif;
  font-size: 38px;
  margin-bottom: 40px;
}

/* ================= CATÁLOGO ================= */

.books {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 36px;
}

.book {
  background: var(--black-soft);
  border: 1px solid #1d1d1d;
  padding: 20px;
  transition: transform .3s ease, border-color .3s ease;
}

.book:hover {
  transform: translateY(-6px);
  border-color: var(--gold);
}

.book img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.book h3 {
  margin: 18px 0 6px;
  font-size: 18px;
}

.book p {
  color: var(--gray-soft);
  font-size: 14px;
}

.book span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--gold);
}

/* ================= FEATURES ================= */

.features {
  list-style: none;
  margin-top: 30px;
}

.features li {
  margin: 12px 0;
  color: var(--gray);
}

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

.footer {
  padding: 40px 20px;
  text-align: center;
  font-size: 13px;
  color: var(--gray-soft);
  background: #000;
}

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

@media (max-width: 1024px) {
  .header {
    padding: 0 32px;
  }

  .section,
  .hero {
    padding-left: 32px;
    padding-right: 32px;
  }
}

@media (max-width: 768px) {
  .header {
    min-height: auto;
    padding: 12px 20px;
  }

  .logo img {
    width: 180px;
    height: auto;
  }

  .nav {
    gap: 18px;
  }

  .hero {
    padding-top: 180px;
  }

  .hero h1 {
    font-size: 40px;
  }

  .section h2 {
    font-size: 32px;
  }
}

@media (max-width: 480px) {
  .nav {
    display: none;
  }

  .hero h1 {
    font-size: 34px;
  }
}