/* =========================================================
   VARIABLES & BASE STYLES
========================================================= */
:root {
  --bg-paper: #ffffff;
  --text-main: #222222;
  --text-muted: #555555;
  --accent-crimson: #8b0000;
  --accent-gold: #d4af37;
  --border-color: #dcdcdc;
  --font-serif: "Crimson Text", Georgia, serif;
  --font-sans: "Inter", -apple-system, sans-serif;
  --ease: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  background-color: var(--bg-paper);
  color: var(--text-main);
  font-family: var(--font-serif);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--ease);
}
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* =========================================================
   HEADER
========================================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: transparent;
  transition:
    background 0.4s ease,
    backdrop-filter 0.4s ease,
    border-bottom 0.4s ease;
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.brand-text {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--accent-crimson);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--accent-crimson);
  border-bottom: 2px solid var(--accent-crimson);
  font-weight: 600;
  padding-bottom: 4px;
}

.lang-switcher button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  color: var(--text-muted);
}
.lang-switcher button.active {
  font-weight: bold;
  color: var(--accent-crimson);
}
.lang-divider {
  margin: 0 5px;
  color: var(--text-muted);
}

/* =========================================================
   HERO SECTION (IVY HEADER)
========================================================= */
.ivy-header {
  padding: 150px 2rem 80px; /* Space for fixed header */
  background-color: var(--bg-paper);
  display: flex;
  justify-content: center;
  text-align: center;
}

.ivy-container {
  max-width: 800px;
}

.subtitle-text {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--text-muted);
}

.main-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 400;
  color: var(--text-main);
  margin: 1rem 0;
}

.crimson-line {
  width: 60px;
  height: 3px;
  background-color: var(--accent-crimson);
  margin: 0 auto;
}

.desc-wrapper {
  margin-top: 1.5rem;
}
.header-desc {
  font-size: 1.2rem;
  color: var(--text-muted);
}

/* =========================================================
   LIBRARY CONTROLS (SEARCH BAR)
========================================================= */
.library-controls {
  margin-bottom: 3rem;
  display: flex;
  justify-content: center;
}

.search-minimal-wrapper {
  position: relative;
  width: 100%;
  max-width: 450px;
}

.search-minimal-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--text-muted);
}

.search-minimal-input {
  width: 100%;
  padding: 12px 15px 12px 45px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  border: 1px solid var(--border-color);
  border-radius: 30px;
  background: var(--bg-paper);
  color: var(--text-main);
  outline: none;
  transition: var(--ease);
}

.search-minimal-input:focus {
  border-color: var(--accent-crimson);
  box-shadow: 0 4px 15px rgba(139, 0, 0, 0.05);
}

/* =========================================================
   LIBRARY GRID & CARDS
========================================================= */
.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 3rem 2rem;
  padding-bottom: 5rem;
}

.book-card {
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

.book-cover {
  position: relative;
  width: 100%;
  aspect-ratio: 2 / 3; /* Memastikan rasio buku proporsional */
  overflow: hidden;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
  margin-bottom: 1.5rem;
  background-color: #f5f5f5; /* Fallback warna jika gambar lambat dimuat */
}

/* KRUSIAL: Aturan untuk memastikan gambar apapun bisa masuk tanpa distorsi */
.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover; /* Mencegah distorsi/gepeng */
  object-position: center; /* Memastikan fokus selalu di tengah */
  display: block; /* Menghilangkan margin bawah default pada img inline */
  transition: transform 0.5s ease;
}

.book-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.book-overlay span {
  color: white;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  border: 1px solid white;
  padding: 10px 20px;
  border-radius: 2px;
}

.book-card:hover .book-cover img {
  transform: scale(1.05);
}
.book-card:hover .book-overlay {
  opacity: 1;
}

.book-info {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.book-category {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-crimson);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.book-info h3 {
  font-size: 1.4rem;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.book-info p {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.no-results-box {
  text-align: center;
  padding: 4rem 0;
  font-family: var(--font-sans);
  color: var(--text-muted);
  display: none;
}

/* =========================================================
   UNIVERSAL FOOTER STYLES
========================================================= */
.site-footer {
  background-color: var(--accent-crimson);
  color: white;
  margin-top: 4rem;
  display: flex;
  flex-direction: column;
}

.footer-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 5rem 2rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 4rem;
}

.footer-center {
  text-align: center;
}

.footer-brand-logo {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  letter-spacing: 0.4em;
  color: var(--accent-gold);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.footer-tagline-large {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.3;
}

.footer-bottom-area {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3rem;
}

.footer-connect-centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.nav-group-title {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-gold);
  font-weight: 600;
}

.connect-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 3rem;
}

.connect-links a {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--ease);
}

.connect-links a i {
  font-size: 1.1rem;
}

.connect-links a:hover {
  color: var(--accent-gold);
  transform: translateY(-3px);
}

.footer-copyright {
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
}

/* =========================================================
   RESPONSIVE DESIGN (TABLET & MOBILE)
========================================================= */

/* Tablet Portrait & Small Laptops */
@media screen and (max-width: 992px) {
  .library-grid {
    /* Sedikit memperkecil minimum lebar grid di tablet */
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 2.5rem 1.5rem;
  }
}

/* Mobile Phones */
@media screen and (max-width: 768px) {
  .site-nav {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.2rem;
    font-size: 0.8rem;
  }

  .ivy-header {
    padding: 180px 1.5rem 50px; /* Menyesuaikan ruang karena header menumpuk */
  }

  .library-grid {
    grid-template-columns: repeat(
      auto-fill,
      minmax(160px, 1fr)
    ); /* Mengizinkan 2 kolom di HP layar standar */
    gap: 2rem 1rem;
  }

  .book-info h3 {
    font-size: 1.1rem;
  }

  .book-info p {
    font-size: 0.85rem;
  }
}

/* Small Mobile Phones (iPhone SE dll) */
@media screen and (max-width: 480px) {
  .container {
    padding: 0 1.2rem;
  }

  .library-grid {
    /* Di layar sangat kecil, grid akan menggunakan 1 kolom (atau 2 kolom sangat rapat) */
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }

  .footer-container {
    padding: 4rem 1.5rem 2rem;
    gap: 3rem;
  }

  .connect-links {
    gap: 1.5rem;
    flex-direction: column;
    align-items: center;
  }

  .footer-tagline-large {
    font-size: 1.5rem; /* Menyesuaikan font footer agar tidak tumpang tindih */
  }
}