body {
    font-family: sans-serif;
    margin: 0;
    background-color: #f4f4f4;
}

#login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

#login-form-container, #register-form-container {
    width: 300px;
    padding: 2rem;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

#login-page h2 {
    text-align: center;
    margin-bottom: 1.5rem;
}

#login-page input {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#login-page button {
    width: 100%;
    padding: 0.75rem;
    background-color: #333;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#login-page p {
    text-align: center;
    margin-top: 1rem;
}

#login-page a {
    color: #333;
    text-decoration: none;
}

#app {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    min-height: 100vh;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: #333;
    color: #fff;
}

header h1 {
    margin: 0;
    font-size: 1.2rem;
}

.filter-section {
    padding: 1rem;
    display: flex;
}

#filter-input {
    flex-grow: 1;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#fetch-books-btn {
    padding: 0.5rem 1rem;
    background-color: #333;
    color: #fff;
    border: none;
    border-radius: 4px;
    margin-left: 0.5rem;
}

#book-list {
    padding: 1rem;
}

.book-item {
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 1rem;
}

#book-read-page {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

#book-read-page main {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1rem;
}

#book-read-page header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: #333;
    color: #fff;
    flex-shrink: 0;
}

.book-info {
    flex-grow: 1;
}

#book-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0;
}

#author-name {
    margin: 0;
    font-size: 0.9rem;
    font-style: italic;
}

#page-info {
    margin: 0 1rem;
}

.kebab-menu {
    position: relative;
}

.kebab-dots {
    cursor: pointer;
    font-size: 1.5rem;
    padding: 0.5rem;
}

.kebab-menu-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.kebab-menu-content .kebab-menu-item {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    cursor: pointer;
}

.kebab-menu-content .kebab-menu-item:hover {
    background-color: #f1f1f1;
}

#book-read-page footer {
    background-color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    flex-shrink: 0;
}

.page-nav-btn {
    background: none;
    border: none;
    color: #fff;
    font-size: 2rem;
    margin: 0 2rem;
}

#play-pause-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    color: white;
    font-size: 2rem;
}

.play-btn {
    background-color: green;
}

.pause-btn {
    background-color: red;
}

#page-text {
    line-height: 1.6;
}

#settings-panel {
    padding: 1rem;
    background-color: #f0f0f0;
    border-bottom: 1px solid #ccc;
}

.setting {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
}

.setting label {
    margin-right: 1rem;
}

#voice-select {
    flex-grow: 1;
}

#rate-slider {
    flex-grow: 1;
}

.header-controls {
    display: flex;
    align-items: center;
}

.header-controls button {
    margin-left: 10px;
    padding: 8px 12px;
    background-color: #5cb85c;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.header-controls .menu {
    margin-left: 15px;
    cursor: pointer;
}

/* Modal Styles */
#subscription-modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto; /* 15% from the top and centered */
    padding: 20px;
    border: 1px solid #888;
    width: 80%; /* Could be more or less, depending on screen size */
    max-width: 500px;
    border-radius: 8px;
    position: relative;
    text-align: center;
}

.close-btn {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close-btn:hover,
.close-btn:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

#qr-code-placeholder {
    width: 200px;
    height: 200px;
    background-color: #eee;
    margin: 20px auto;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px dashed #ccc;
}

#otp-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
}