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

body {
    font-family: 'Segoe UI', sans-serif;
    background: #e0e0e0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}
.motivation{
	color:green;
}
/* Book Container (3D Perspective) */
.book {
    width: 800px;
    height: 600px;
    position: relative;
    perspective: 2000px; /* Depth for 3D flip */
    transform-style: preserve-3d;
    margin-bottom: 20px;
}

/* Individual Page - positioned on right half of book */
.page {
    position: absolute;
    width: 50%;
    height: 100%;
    right: 0;
    transform-style: preserve-3d;
    transform-origin: left center; /* Flip from left edge (center of book) */
    transition: transform 0.8s ease-in-out;
    z-index: 1;
}

/* Page Faces (Front/Back) */
.page-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden; /* Hide back when flipped */
    padding: 40px 60px 40px 80px; /* Space for spiral binding */
    background: #fefefc; /* Paper color */
    /* Notebook lined paper effect */
    background-image: repeating-linear-gradient(
        to bottom,
        transparent,
        transparent 23px,
        #e0e8ff 23px,
        #e0e8ff 24px
    );
    border-radius: 0 8px 8px 0;
    box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
    overflow-y: auto;
}

/* Back face of page */
.page-face.back {
    transform: rotateY(180deg);
    background: #fefefc;
    /* Lined paper on back too */
    background-image: repeating-linear-gradient(
        to bottom,
        transparent,
        transparent 23px,
        #e0e8ff 23px,
        #e0e8ff 24px
    );
}
/* Flipped Page State - rotate to show back face on left half */
.page.flipped {
    transform: rotateY(-180deg);
}

/* Z-index now managed by JavaScript */

/* Navigation */
.nav {
    display: flex;
    gap: 20px;
    align-items: center;
    margin-bottom: 20px;
}

.nav button {
    padding: 8px 16px;
    cursor: pointer;
    background: #4a6fa5;
    color: white;
    border: none;
    border-radius: 4px;
}

#page-counter {
    font-weight: bold;
}

/* Table of Contents Sidebar */
.toc-sidebar {
    position: fixed;
    left: -300px;
    top: 0;
    width: 300px;
    height: 100%;
    background: white;
    padding: 20px;
    box-shadow: 2px 0 10px rgba(0,0,0,0.2);
    transition: left 0.3s ease;
    z-index: 1000;
    overflow-y: auto;
}

.toc-sidebar.open {
    left: 0;
}

#toc-close {
    position: absolute;
    right: 10px;
    top: 10px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
}

#toc-list {
    list-style: none;
    margin-top: 30px;
}

#toc-list li {
    margin-bottom: 10px;
    cursor: pointer;
    color: #4a6fa5;
}

#toc-list li:hover {
    text-decoration: underline;
}

#toc-toggle {
    position: fixed;
    left: 20px;
    top: 20px;
    padding: 8px 16px;
    cursor: pointer;
    background: #4a6fa5;
    color: white;
    border: none;
    border-radius: 4px;
}

/* Search Modal */
.search-modal {
    position: fixed;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    background: white;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    transition: top 0.3s ease;
    z-index: 1000;
}

.search-modal.open {
    top: 20px;
}

#search-input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#search-results {
    max-height: 100px;
    overflow-y: auto;
}

#search-results div {
    padding: 5px;
    cursor: pointer;
    color: #4a6fa5;
}

#search-results div:hover {
    background: #f0f0f0;
}

#search-close {
    position: absolute;
    right: 10px;
    top: 10px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
}

#search-toggle {
    position: fixed;
    right: 20px;
    top: 20px;
    padding: 8px 16px;
    cursor: pointer;
    background: #4a6fa5;
    color: white;
    border: none;
    border-radius: 4px;
}

/* Bookmark Button */
.bookmark-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #ccc;
}

.bookmark-btn.bookmarked {
    color: #ffd700; /* Gold for bookmarked */
}

/* Code Snippet Styling */
code {
    background: #f0f0f0;
    padding: 2px 4px;
    border-radius: 3px;
}

pre {
    background: #f0f0f0;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
    margin: 10px 0;
}
.parenttut{
	background-color:red;
	padding: 20px;
}
.parenttut h1{
	color:blue;
}
.parenttut span{
	color:yellow;
}