:root {
  --bg: #fef6f6;
  --text: #333;
  --accent: #ffb6b9;
  --button-bg: #ff6f61;
  --button-text: #fff;
  --nav-bg: #fff;
  --text-color: #333;
  --accent-color: #db19bb;
  --accent-hover: #b45ada;
}

body.dark {
  --bg: #1c1c1c;
  --text: #eee;
  --accent: #444;
  --button-bg: #333;
  --button-text: #fff;
  --nav-bg: #2a2a2a;
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, color 0.3s ease;
}

/* Header/NavBar */
header {
  background-color: var(--nav-bg);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--accent);
}

header .logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--text);
  text-decoration: none;
  transition: color 0.3s;
}

.nav-buttons {
  display: flex;
  gap: 1rem;
}

.nav-buttons button {
  background-color: var(--button-bg);
  color: var(--button-text);
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 5px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.3s;
}

.nav-buttons button:hover {
  opacity: 0.85;
}

/* Main Hero Section */
main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
}

.hero {
  max-width: 600px;
  animation: fadeIn 1s ease-in-out;
}

.hero h2 {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.cta {
  padding: 0.75rem 1.5rem;
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  border-radius: 25px;
  font-size: 1rem;
  cursor: pointer;
}

.cta:hover {
  opacity: 0.95;
}

/* Footer */
footer {
  background-color: var(--nav-bg);
  color: var(--text);
  text-align: center;
  padding: 1rem;
  border-top: 1px solid var(--accent);
  font-size: 0.9rem;
}

/* Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  max-width: 350px;
  padding: 0.75rem 1rem;
  border: 1px solid var(--accent);
  border-radius: 8px;
  font-size: 1rem;
  background-color: #fff;
  color: #333;
  transition: 0.3s ease;
  outline: none;
}

body.dark input[type="text"],
body.dark input[type="email"],
body.dark input[type="password"] {
  background-color: #2a2a2a;
  color: #eee;
  border-color: #555;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
  border-color: var(--button-bg);
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

.book-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.book-card {
  background-color: var(--nav-bg);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.book-info h3 {
  margin-bottom: 0.5rem;
}

.book-actions button {
  margin-left: 10px;
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-weight: bold;
  transition: 0.3s ease;
}

.book-actions button:hover {
  opacity: 0.9;
}

.center-text {
  text-align: center;
  margin-top: 20px;
}

.book-list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 30px;
}

.book-card {
  background: var(--card-bg);
  padding: 10px;
  border-radius: 8px;
  text-align: center;
  position: relative;
  width: 150px;
  box-shadow: var(--box-shadow);
  transition: transform 0.2s;
}

.book-card:hover {
  transform: scale(1.02);
}

.book-cover {
  position: relative;
  height: 200px;
  width: 130px;
  margin: 0 auto;
  border: 1px solid var(--border);
  overflow: hidden;
}

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

.three-dots {
  position: absolute;
  bottom: 5px;
  right: 5px;
  font-size: 20px;
  display: none;
  cursor: pointer;
}

.book-cover:hover .three-dots {
  display: block;
}

.book-meta h3 {
  font-size: 16px;
  margin: 10px 0 5px;
}

.book-meta p {
  font-size: 14px;
  color: var(--text-secondary);
}

.reader-container {
  display: flex;
  height: calc(100vh - 100px);
}

.sidebar {
  width: 200px;
  background: var(--card-bg);
  padding: 20px;
  overflow-y: auto;
  border-right: 1px solid var(--border);
}

.sidebar h3 {
  margin-bottom: 10px;
}

.sidebar ul {
  list-style: none;
  padding: 0;
}

.sidebar ul li a {
  color: var(--text);
  text-decoration: none;
  display: block;
  margin-bottom: 8px;
}

.reader-panel {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
}

.reader-controls {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 10px;
}

.epub-content {
  background: var(--card-bg);
  padding: 20px;
  border-radius: 8px;
  line-height: 1.6;
  font-size: 16px;
  color: var(--text);
}

.reader-wrapper {
  position: relative;
  display: flex;
  height: calc(100vh - 100px);
}

.menu-btn {
  position: absolute;
  top: 70px;
  left: 20px;
  font-size: 24px;
  background: var(--card-bg);
  border: none;
  padding: 8px 12px;
  cursor: pointer;
  z-index: 10;
}


.sidebar {
  position: absolute;
  left: -250px;
  top: 70px;
  width: 250px;
  height: calc(100% - 70px);
  background-color: var(--card-bg);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  transition: left 0.3s ease;
  z-index: 5;
}

.sidebar.visible {
  left: 0;
}


.reader-area {
  flex: 1;
  margin-left: 0;
  padding: 20px;
  overflow-y: auto;
  margin-top: 70px;
}

.reader-controls {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.font-buttons button {
  padding: 6px 12px;
  font-size: 18px;
  margin-right: 5px;
  cursor: pointer;
}

.reading-theme select {
  padding: 5px;
}

.epub-content {
  background: var(--card-bg);
  padding: 20px;
  border-radius: 8px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
}

/* Reading themes */
.theme-light {
  background: #ffffff;
  color: #111111;
}

.theme-dark {
  background: #1e1e1e;
  color: #f0f0f0;
}

.theme-sepia {
  background: #f4ecd8;
  color: #5b4636;
}

/* General button styling */
button {
  background-color: #4a4a4a;
  color: #fff;
  padding: 6px 12px;
  margin: 5px;
  border: none;
  border-radius: 4px;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

button:hover {
  background-color: #6c6c6c;
}

/* Font control buttons */
.font-buttons {
  display: flex;
  gap: 10px;
  align-items: center;
}

/* Dropdown styling */
.reading-theme {
  margin-left: 20px;
}

.reading-theme select {
  padding: 5px 10px;
  border-radius: 4px;
  border: 1px solid #ccc;
  background-color: #f9f9f9;
  color: #333;
}

/* Adjust on dark mode */
body.dark .reading-theme select {
  background-color: #2b2b2b;
  color: #fff;
  border: 1px solid #555;
}

.reader-controls {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  margin-bottom: 10px;
}

/* Sidebar animation */
.sidebar {
  display: none;
  padding: 1em;
  background: var(--sidebar-bg, #f0f0f0);
  transition: all 0.3s ease;
}

.sidebar.visible {
  display: block;
}



body.dark .sidebar {
  background-color: #2a2a2a;
  color: white;
}

/* Hamburger button */
.menu-btn {
  position: absolute;
  top: 70px;
  left: 10px;
  background: transparent;
  font-size: 24px;
  border: none;
  cursor: pointer;
  color: inherit;
}

/* Chapter list */
.sidebar ul {
  list-style: none;
  padding: 0;
}

.sidebar li {
  margin: 10px 0;
}

.sidebar a {
  color: inherit;
  text-decoration: none;
  font-weight: 500;
}

.sidebar a:hover {
  text-decoration: underline;
}

.file-upload {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.upload-btn {
  padding: 0.5em 1em;
  background-color: var(--accent-color, #db19bb);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: bold;
}

.upload-btn:hover {
  background-color: var(--accent-hover, #b45ada);
}

#upload {
  display: none; /* Hide the real file input */
}

#file-name {
  font-style: italic;
  color: var(--text-color);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}