/* learnTECH Books - Master Design System v4.0 
    Estratégia: Luxury UX + Conversion Focus
    Manutenção: [INÍCIO] e [FIM] por seção
*/

:root {
  /* Paleta de Cores de Prestígio */
  --primary: #0984e3;
  --primary-dark: #074b83;
  --accent: #b12704;
  --bg-light: #fcfcfc;
  --bg-section: #f4f7f6;
  --text-main: #2d3436;
  --text-muted: #636e72;
  --white: #ffffff;
  --glass: rgba(255, 255, 255, 0.85);

  /* Tipografia */
  --font-serif: "Merriweather", serif;
  --font-sans: "Inter", sans-serif;

  /* Tokens de Design */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 12px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);
  --transition: all 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
  --border-radius: 16px;
}

/* --- [INÍCIO] RESET & BASE --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-light);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  scroll-behavior: smooth;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}
.section-padding {
  padding: 80px 0;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}
.section-subtitle {
  color: var(--text-muted);
  margin-bottom: 3rem;
}
/* --- [FIM] RESET & BASE --- */

/* --- [INÍCIO] NAVBAR ELITE --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  background: var(--glass);
  backdrop-filter: blur(15px);
  z-index: 3000;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: var(--transition);
}

.navbar-scrolled {
  height: 70px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
}

.logo {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.5rem;
}
.logo span {
  color: var(--primary);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}
.nav-links a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  transition: 0.3s;
}
.nav-links a:hover {
  color: var(--primary);
}
/* --- [FIM] NAVBAR ELITE --- */

/* --- [INÍCIO] HERO SECTION --- */
.hero {
  height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--white);
  background:
    linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.6)),
    url("https://images.unsplash.com/photo-1507842217343-583bb7270b66?auto=format&fit=crop&w=1600&q=80");
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  clip-path: ellipse(150% 100% at 50% 0%);
  margin-bottom: 40px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.1;
  margin-bottom: 1.5rem;
}
.btn-cta-hero {
  background: var(--primary);
  color: white;
  padding: 1.2rem 3.5rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 700;
  transition: var(--transition);
  display: inline-block;
}
.btn-cta-hero:hover {
  transform: translateY(-5px);
  background: var(--primary-dark);
}
/* --- [FIM] HERO SECTION --- */

/* --- [INÍCIO] SEÇÃO 1: CARROSSEL DESTAQUES --- */
.carousel-track {
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
  padding: 20px 0 40px;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}
.carousel-track::-webkit-scrollbar {
  display: none;
}

.destaque-card-premium {
  min-width: 85%;
  height: 420px;
  background: #f4f7f6;
  border-radius: 32px;
  display: flex;
  align-items: center;
  padding: 3rem;
  scroll-snap-align: center;
  flex-shrink: 0;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

@media (min-width: 1024px) {
  .destaque-card-premium {
    min-width: calc(48% - 1rem);
  }
}

.destaque-image-wrapper img {
  height: 300px;
  filter: drop-shadow(15px 15px 25px rgba(0, 0, 0, 0.2));
  transform: rotate(6deg);
  transition: var(--transition);
}
.destaque-card-premium:hover .destaque-image-wrapper img {
  transform: rotate(0deg) scale(1.05);
}
/* --- [FIM] SEÇÃO 1: CARROSSEL DESTAQUES --- */

/* --- [INÍCIO] SEÇÃO 2: MAIS VENDIDOS --- */
.bg-section {
  background-color: var(--bg-section);
}
.grid-mais-vendidos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.card-mais-vendido {
  background: var(--white);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
  position: relative;
  cursor: pointer;
}
.card-mais-vendido:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.rank-badge {
  position: absolute;
  top: -10px;
  left: -10px;
  background: #e67e22;
  color: white;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.8rem;
  z-index: 5;
}

.card-mais-vendido img {
  width: 80px;
  height: 110px;
  object-fit: cover;
  border-radius: 6px;
}
/* --- [FIM] SEÇÃO 2: MAIS VENDIDOS --- */

/* --- [INÍCIO] SEÇÃO 3: CATÁLOGO & FILTROS --- */
.search-filters {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 2rem 0;
  gap: 2rem;
}
.search-bar {
  width: 100%;
  padding: 0.8rem 1.5rem;
  border-radius: 50px;
  border: 1px solid #ddd;
  outline: none;
}

.filter-btn {
  padding: 0.5rem 1.5rem;
  border-radius: 50px;
  border: 1px solid #ddd;
  background: white;
  cursor: pointer;
  transition: 0.3s;
}
.filter-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.grid-livros {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 2rem;
}

.livro-card {
  background: white;
  padding: 1rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
  position: relative;
  opacity: 0;
}
.livro-card img {
  width: 100%;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.valor-promo {
  color: var(--accent);
  font-size: 1.3rem;
  font-weight: 800;
}
.valor-promo span {
  font-size: 0.7rem;
  vertical-align: super;
}

.badge-top {
  position: absolute;
  top: 15px;
  left: 15px;
  background: #f1c40f;
  color: #000;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.6rem;
  font-weight: 800;
}
/* --- [FIM] SEÇÃO 3: CATÁLOGO & FILTROS --- */

/* --- [INÍCIO] MODAL --- */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  z-index: 5000;
  align-items: center;
  justify-content: center;
}
.modal-content {
  background: white;
  padding: 3rem;
  border-radius: 24px;
  width: 90%;
  max-width: 800px;
  position: relative;
}
.close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 2rem;
  cursor: pointer;
  border: none;
  background: none;
}
.modal-body-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2.5rem;
}
/* --- [FIM] MODAL --- */

/* --- [INÍCIO] FOOTER --- */
.footer-simple {
  background: #1e272e;
  color: white;
  padding: 4rem 0 2rem;
  margin-top: 80px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-bottom: 2rem;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: #aaa;
}
/* --- [FIM] FOOTER --- */