@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,600;0,700;1,400&family=Montserrat:wght@300;400;500;600&display=swap');

:root {
    --primary: #1B3022;
    --primary-light: #395742;
    --primary-dark: #0D1A12;
    --accent: #A67C52;
    --accent-light: #C5A17F;
    --bg-color: #F5F2E7;
    --page-bg: #FCFBF7;
    --text-main: #2C2C2C;
    --text-muted: #5C5C5C;
    --border-color: #D6D0C2;
    --font-heading: 'Cormorant Garamond', serif;
    --font-body: 'Montserrat', sans-serif;
    --transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 15px 45px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-body);
    color: var(--text-main);
    background-color: var(--bg-color);
    background-image: url('https://www.transparenttextures.com/patterns/paper-fibers.png');
    line-height: 1.6;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header Navigation */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 3rem;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    letter-spacing: 1px;
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--accent);
}

.btn-toc {
    background: var(--primary);
    border: none;
    color: #fff;
    padding: 0.6rem 1.2rem;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    transition: var(--transition);
    box-shadow: var(--shadow-soft);
}

.btn-toc:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Main Book Area */
.book-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 2000px;
}

#pages-wrapper {
    width: 95%;
    max-width: 1400px;
    height: 92%;
    position: relative;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
    background: var(--page-bg);
}

#pages-wrapper::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: rgba(0, 0, 0, 0.1);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    z-index: 20;
    transform: translateX(-50%);
}

/* Page Styles */
.page {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: transform 0.8s cubic-bezier(0.645, 0.045, 0.355, 1), opacity 0.6s ease;
    background: var(--page-bg);
    display: flex;
    opacity: 0;
    visibility: hidden;
    transform: rotateY(90deg);
    transform-origin: left center;
    z-index: 1;
    overflow: hidden;
}

.page.active {
    opacity: 1;
    visibility: visible;
    transform: rotateY(0deg);
    z-index: 10;
}

.page.prev {
    transform: rotateY(-90deg);
    opacity: 0;
    visibility: hidden;
}

/* Title Page */
.title-page {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: radial-gradient(circle at center, #FDFBF7 0%, #E5E0D5 100%);
    border-right: 1px solid rgba(0, 0, 0, 0.1);
}

.title-content {
    max-width: 800px;
    padding: 4rem;
    z-index: 2;
    position: relative;
}

.title-page h1 {
    font-family: var(--font-heading);
    font-size: 5rem;
    color: var(--primary-dark);
    margin: 1.5rem 0;
    line-height: 1;
    font-weight: 700;
}

.subtitle {
    font-family: var(--font-body);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 5px;
    color: var(--accent);
    font-weight: 600;
}

.description {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 4rem;
    font-style: italic;
}

.author-credits {
    margin-bottom: 4rem;
    padding: 2.5rem;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.author-credits::before,
.author-credits::after {
    content: '◈';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    color: var(--accent);
    font-size: 1.2rem;
}

.author-credits::before {
    top: -0.7rem;
}

.author-credits::after {
    bottom: -0.7rem;
}

.author-credits p {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.author-credits h3 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    color: var(--primary);
    margin: 0.5rem 0;
    font-weight: 600;
}

.author-credits a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
}

.author-credits a:hover {
    color: var(--accent-light);
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
    border: none;
    padding: 1.2rem 3rem;
    font-size: 1rem;
    font-family: var(--font-body);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 0 auto;
    transition: var(--transition);
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    background-color: var(--primary-light);
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

/* Content Page */
.content-page {
    display: flex;
    flex-direction: row;
}

.page-image {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.page-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.page-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.1) 0%, transparent 20%);
}

.page-details {
    flex: 1;
    padding: 2rem 3rem;
    overflow-y: auto;
    background-color: var(--page-bg);
    position: relative;
    border-left: 1px solid rgba(0, 0, 0, 0.05);
    scrollbar-width: thin;
    scrollbar-color: var(--accent) transparent;
}

.page-details::-webkit-scrollbar {
    width: 6px;
}

.page-details::-webkit-scrollbar-track {
    background: transparent;
}

.page-details::-webkit-scrollbar-thumb {
    background-color: var(--accent);
    border-radius: 4px;
}

.plant-number {
    font-family: var(--font-body);
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 1rem;
    display: block;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.plant-title {
    font-family: var(--font-heading);
    font-size: 4rem;
    color: var(--primary-dark);
    line-height: 1;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.plant-scientific {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--primary);
    margin: 1.5rem 0 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 600;
}

.section-title i {
    color: var(--accent);
}

.plant-text {
    font-size: 0.95rem;
    color: var(--text-main);
    line-height: 1.5;
    margin-bottom: 1rem;
}

/* Controls */
.book-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem 2rem;
    background-color: #fff;
    border-top: 1px solid var(--border-color);
    gap: 2rem;
    z-index: 100;
}

.control-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: none;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.control-btn:hover:not(:disabled) {
    background-color: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.control-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.page-indicator {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--text-muted);
    font-weight: 500;
    min-width: 80px;
    text-align: center;
}

#current-page-num {
    color: var(--primary-dark);
}

/* TOC Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.open {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: #fff;
    width: 90%;
    max-width: 1000px;
    height: 80vh;
    border-radius: 12px;
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    transform: translateY(20px);
    transition: var(--transition);
}

.modal.open .modal-content {
    transform: translateY(0);
}

.modal-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-family: var(--font-heading);
    color: var(--primary-dark);
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
}

.icon-btn:hover {
    color: var(--primary);
}

.toc-grid {
    padding: 2rem;
    overflow-y: auto;
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.toc-item {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toc-item:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.toc-item-img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    border-radius: 4px;
}

.toc-item-title {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--primary-dark);
    font-size: 1.1rem;
}

.toc-item-num {
    font-size: 0.8rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Footer */
.app-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    background-color: var(--primary-dark);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    position: relative;
    z-index: 100;
}

.settings-link {
    position: absolute;
    right: 2rem;
    color: rgba(255, 255, 255, 0.4);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    transition: var(--transition);
}

.settings-link:hover {
    color: #fff;
}

/* Loader */
.loader-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 50;
    transition: opacity 0.5s ease;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(45, 90, 39, 0.2);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.adsense-container-full {
    width: 100%;
    margin: 3rem 0;
    padding: 2rem;
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    min-height: 250px;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Responsiveness */
@media (max-width: 1024px) {
    #pages-wrapper {
        width: 95%;
        height: 90%;
    }
}

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

    #pages-wrapper::before {
        display: none;
    }

    .page-image {
        flex: none;
        height: 35%;
    }

    .page-details {
        flex: 1;
        padding: 3rem 2rem;
        border-left: none;
    }

    .plant-title {
        font-size: 2.8rem;
    }

    .title-page h1 {
        font-size: 3rem;
    }

    .nav-links a:not(.btn-toc) {
        display: none;
    }

    .app-header {
        padding: 1rem 1.5rem;
    }

    .sponsored-page .page-details {
        padding: 4rem 2rem;
    }
}