/* ================================
   Base and theme
   ================================ */
:root {
  /* Brand accents */
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface-2: #1f1f1f;
  --text: #f0f0f0;
  --muted: #b5b5b5;

  /* Accents */
  --accent: #25D366;     /* WhatsApp green */
  --accent-dark: #128C7E;
  --gold: #FFD700;       /* Heading accent */

  /* Shadows */
  --glow-green: 0 0 12px rgba(37, 211, 102, 0.35);
  --glow-gold: 0 0 12px rgba(255, 215, 0, 0.30);
  --shadow-soft: 0 6px 20px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ================================
   Layout
   ================================ */
.container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 280px;
  padding: 24px;
  background: linear-gradient(180deg, #141414 0%, #111 100%);
  border-right: 1px solid #222;
  position: sticky;
  top: 0;
  align-self: flex-start;
  height: 100vh;
}

.sidebar h2 {
  margin: 0 0 16px 0;
  font-weight: 600;
  color: var(--gold);
  text-shadow: var(--glow-gold);
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
}

.sidebar nav a {
  color: var(--text);
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 8px;
  background-color: transparent;
  transition: background-color 0.25s ease, color 0.25s ease, transform 0.2s ease;
}

.sidebar nav a:hover {
  background-color: var(--surface);
  color: #ffffff;
  transform: translateX(4px);
}

/* Main content */
.content {
  flex: 1;
  padding: 32px;
}

/* ================================
   Hero section
   ================================ */
.hero {
  background: linear-gradient(180deg, var(--surface-2) 0%, var(--surface) 100%);
  border: 1px solid #222;
  border-radius: 16px;
  padding: 28px;
  box-shadow: var(--shadow-soft);
}

.hero h2 {
  margin: 0 0 8px 0;
  color: var(--gold);
  text-shadow: var(--glow-gold);
}

.hero p {
  margin: 0 0 18px 0;
  color: var(--muted);
}

.hero a button {
  background-color: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 18px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
}

.hero a button:hover {
  background-color: var(--accent-dark);
  box-shadow: var(--glow-green);
  transform: translateY(-1px);
}

/* ================================
   Sections and headings
   ================================ */
section {
  margin-top: 28px;
}

#books h2,
#contact h2 {
  color: var(--gold);
  text-shadow: var(--glow-gold);
  margin: 0 0 16px 0;
}

/* ================================
   Search bar (Option 1)
   ================================ */
#searchBar {
  width: 100%;
  padding: 12px;
  margin: 16px 0 22px 0;
  border: 1px solid #333;
  border-radius: 10px;
  background-color: var(--surface);
  color: var(--text);
  font-size: 16px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#searchBar::placeholder {
  color: #8a8a8a;
}

#searchBar:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--glow-green);
}

/* ================================
   Book cards
   ================================ */
.book-card {
  background-color: var(--surface-2);
  border: 1px solid #222;
  border-radius: 14px;
  padding: 18px;
  margin: 18px 0;
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.book-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
  border-color: #2a2a2a;
}

.book-card img {
  width: 100%;
  display: block;
  border-radius: 10px;
  margin-bottom: 14px;
  box-shadow: var(--glow-gold);
}

.book-card h3 {
  margin: 0 0 6px 0;
  color: var(--gold);
}

.book-card p {
  margin: 0 0 14px 0;
  color: var(--muted);
}

.book-card a button {
  background-color: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
}

.book-card a button:hover {
  background-color: var(--accent-dark);
  box-shadow: var(--glow-green);
  transform: translateY(-1px);
}

/* ================================
   Contact (Option 2)
   ================================ */
.contact {
  background: linear-gradient(180deg, var(--surface) 0%, #161616 100%);
  border: 1px solid #222;
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

.contact form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 18px 0;
}

.contact input,
.contact textarea {
  padding: 12px;
  border: 1px solid #333;
  border-radius: 10px;
  background-color: var(--surface);
  color: var(--text);
  font-size: 14px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact input::placeholder,
.contact textarea::placeholder {
  color: #8a8a8a;
}

.contact input:focus,
.contact textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--glow-green);
}

.contact button {
  background-color: var(--accent);
  color: #fff;
  border: none;
  padding: 12px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
}

.contact button:hover {
  background-color: var(--accent-dark);
  box-shadow: var(--glow-green);
  transform: translateY(-1px);
}

.contact p {
  color: var(--muted);
  margin-top: 8px;
}

/* ================================
   Footer
   ================================ */
footer {
  margin-top: 24px;
  padding: 14px 0;
  color: var(--muted);
  border-top: 1px solid #222;
}

/* ================================
   Buttons (global baseline)
   ================================ */
button {
  font-family: inherit;
}

/* ================================
   Responsive design
   ================================ */
@media (max-width: 1024px) {
  .sidebar {
    width: 240px;
  }
}

@media (max-width: 768px) {
  .container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid #222;
    margin-bottom: 12px;
  }

  .sidebar nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .content {
    padding: 20px;
  }

  .hero,
  .contact {
    border-radius: 14px;
    padding: 22px;
  }

  .book-card {
    margin: 14px 0;
    border-radius: 12px;
    padding: 16px;
  }
}

@media (max-width: 480px) {
  h2 {
    font-size: 20px;
  }
  h3 {
    font-size: 16px;
  }
  p {
    font-size: 14px;
  }

  .hero a button,
  .book-card a button,
  .contact button {
    width: 100%;
    padding: 14px;
    font-size: 14px;
  }

  #searchBar {
    font-size: 14px;
    padding: 10px;
  }
}