/* ============================================
   BookShelf - Digital Library Application
   Modern, Premium Design System
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
    /* Colors */
    --color-bg-primary: #f5f0e8;
    --color-bg-secondary: #ffffff;
    --color-bg-sidebar: #f0ebe3;
    --color-text-primary: #2d2d2d;
    --color-text-secondary: #6b6b6b;
    --color-text-muted: #999999;
    --color-accent-primary: #c17f59;
    --color-accent-secondary: #a86b4a;
    --color-accent-highlight: #d4a574;
    --color-border: #e5e0d8;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-shadow-strong: rgba(0, 0, 0, 0.15);

    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50%;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;

    /* Shadows */
    --shadow-sm: 0 2px 8px var(--color-shadow);
    --shadow-md: 0 4px 16px var(--color-shadow);
    --shadow-lg: 0 8px 32px var(--color-shadow-strong);
    --shadow-book: 0 20px 40px rgba(0, 0, 0, 0.2);
}

/* Reset & Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    width: 100%;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    width: 100%;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   App Container Layout
   ============================================ */
.app-container {
    display: flex;
    min-height: 100vh;
    width: 100%;
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

/* ============================================
   Sidebar Navigation
   ============================================ */
.sidebar {
    width: 70px;
    background-color: var(--color-bg-sidebar);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg) 0;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: 100;
    border-right: 1px solid var(--color-border);
    transition: width var(--transition-normal);
}

.sidebar.expanded {
    width: 200px;
    align-items: flex-start;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

.logo {
    margin-bottom: var(--spacing-2xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    justify-content: center;
}

.sidebar.expanded .logo {
    justify-content: flex-start;
    padding-left: var(--spacing-sm);
}

.logo-text {
    display: none;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text-primary);
    white-space: nowrap;
}

.sidebar.expanded .logo-text {
    display: block;
}

.logo-icon {
    width: 36px;
    height: 36px;
    color: var(--color-text-primary);
    flex-shrink: 0;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    flex: 1;
    width: 100%;
    align-items: center;
}

.sidebar.expanded .nav-menu {
    align-items: stretch;
}

.nav-item {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
    position: relative;
    gap: var(--spacing-sm);
}

.sidebar.expanded .nav-item {
    width: 100%;
    justify-content: flex-start;
    padding-left: var(--spacing-md);
}

.nav-item-text {
    display: none;
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
}

.sidebar.expanded .nav-item-text {
    display: block;
}

.nav-item svg {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

.nav-item:hover {
    background-color: rgba(193, 127, 89, 0.1);
    color: var(--color-accent-primary);
}

.nav-item.active {
    background-color: var(--color-accent-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: -15px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 24px;
    background-color: var(--color-accent-primary);
    border-radius: 0 4px 4px 0;
}

.sidebar.expanded .nav-item.active::before {
    left: -12px;
}

.sidebar-bottom {
    margin-top: auto;
    width: 100%;
    display: flex;
    justify-content: center;
}

.sidebar.expanded .sidebar-bottom {
    justify-content: flex-start;
    padding-left: var(--spacing-sm);
}

.menu-toggle {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.menu-toggle:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--color-accent-primary);
}

.menu-toggle svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   Main Content Area
   ============================================ */
.main-content {
    flex: 1;
    margin-left: 70px;
    padding: var(--spacing-lg) var(--spacing-2xl);
    max-width: calc(100vw - 70px);
    overflow-x: hidden;
    transition: margin-left var(--transition-normal);
}

/* ============================================
   Header
   ============================================ */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
}

.search-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-xl);
    width: 350px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.search-bar:focus-within {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.search-bar svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.search-bar input {
    border: none;
    outline: none;
    font-size: 0.875rem;
    color: var(--color-text-primary);
    width: 100%;
    background: transparent;
}

.search-bar input::placeholder {
    color: var(--color-text-muted);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-name {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-text-primary);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 2px solid var(--color-border);
}

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

.notification-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
    border-radius: var(--radius-full);
}

.notification-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--color-text-primary);
}

.notification-btn svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   Page Sections
   ============================================ */
.page {
    display: none;
    animation: fadeIn 0.5s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Page 1 - Keep the Story Going
   ============================================ */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.left-section {
    padding-right: var(--spacing-xl);
}

.main-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.subtitle {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 400px;
    line-height: 1.7;
}

/* Primary Button */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--color-text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

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

.btn-primary svg {
    width: 18px;
    height: 18px;
}

/* Author Card */
.right-section {
    display: flex;
    justify-content: flex-end;
}

.author-card {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 340px;
    box-shadow: var(--shadow-md);
}

.author-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.author-info h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
}

.author-info span {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.more-btn {
    margin-left: auto;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.more-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.more-btn svg {
    width: 20px;
    height: 20px;
}

.author-bio {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.nav-arrows {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.arrow-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
}

.arrow-btn:hover {
    border-color: var(--color-text-primary);
    color: var(--color-text-primary);
}

.arrow-btn svg {
    width: 16px;
    height: 16px;
}

/* ============================================
   Books Carousel
   ============================================ */
.books-section {
    margin-top: var(--spacing-xl);
}

.books-carousel {
    display: flex;
    gap: var(--spacing-lg);
    overflow-x: auto;
    padding: var(--spacing-md) 0;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.books-carousel::-webkit-scrollbar {
    display: none;
}

.book-card {
    flex-shrink: 0;
    width: 160px;
    scroll-snap-align: start;
    transition: all var(--transition-normal);
}

.book-card.featured {
    width: 200px;
}

.book-cover {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-book);
    margin-bottom: var(--spacing-md);
    aspect-ratio: 2/3;
    transition: all var(--transition-normal);
}

.book-card:hover .book-cover {
    transform: translateY(-8px) rotate(-2deg);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

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

.book-card h4 {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-primary);
    line-height: 1.4;
}

.book-card.featured h4 {
    color: var(--color-accent-primary);
    font-weight: 600;
}

/* Christmas Gift Card Styles */
.gift-card.christmas {
    flex-shrink: 0;
    width: 200px;
    scroll-snap-align: start;
}

.gift-card.christmas .gift-cover {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-book);
    margin-bottom: var(--spacing-md);
    aspect-ratio: 2/3;
    transition: all var(--transition-normal);
}

.gift-card.christmas:hover .gift-cover {
    transform: translateY(-8px) rotate(-2deg);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.gift-card.christmas .gift-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gift-card.christmas h4 {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-primary);
    line-height: 1.4;
}

.christmas-glow,
.gift-ribbon {
    display: none;
}

.christmas-notice {
    color: var(--color-accent-primary) !important;
}

.christmas-notice svg {
    stroke: var(--color-accent-primary);
}

/* Mobile responsive - equal card sizes */
@media (max-width: 480px) {
    .books-carousel {
        justify-content: center;
        gap: var(--spacing-md);
    }

    .book-card,
    .book-card.featured,
    .gift-card.christmas {
        width: calc(50% - var(--spacing-md));
        min-width: 140px;
        max-width: 160px;
    }
}

/* Carousel Footer */
.carousel-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.collection-notice {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.collection-notice svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.collection-notice a {
    color: var(--color-accent-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.collection-notice a:hover {
    color: var(--color-accent-secondary);
}

.book-counter {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.book-counter .current {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-accent-primary);
}

/* ============================================
   Page 2 - Happy Reading
   ============================================ */
.content-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
}

.left-section-2 {
    padding-right: var(--spacing-xl);
}

.greeting {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

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

.reading-prompt {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 380px;
    line-height: 1.7;
}

/* Popular Section */
.popular-section {
    margin-top: var(--spacing-2xl);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.section-header h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
}

.popular-books {
    display: flex;
    gap: var(--spacing-md);
}

.popular-book {
    width: 100px;
    text-align: center;
}

.popular-book img {
    width: 100%;
    aspect-ratio: 2/3;
    object-fit: cover;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.popular-book:hover img {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.popular-book span {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    display: block;
    line-height: 1.3;
}

/* New Series */
.new-series {
    margin-top: var(--spacing-2xl);
}

.new-series h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.series-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.series-item img {
    width: 50px;
    height: 70px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.series-info {
    flex: 1;
}

.series-info h4 {
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.series-info span {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.vol-count {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* Right Section Page 2 */
.right-section-2 {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* Current Book Card */
.current-book-card {
    display: flex;
    gap: var(--spacing-xl);
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 100%;
    overflow: hidden;
}

.current-book-card .book-3d {
    position: relative;
    width: 180px;
    max-height: 280px;
    flex-shrink: 0;
    perspective: 1000px;
}

.current-book-card .book-3d img {
    width: 100%;
    max-height: 280px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-book);
    transform: rotateY(-15deg);
    transition: all var(--transition-slow);
}

.current-book-card .book-3d:hover img {
    transform: rotateY(0deg);
}

.book-details {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.book-details h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    word-wrap: break-word;
}

.progress-info {
    font-size: 0.9rem;
    color: var(--color-accent-primary);
    margin-bottom: var(--spacing-md);
}

.progress-info .pages-read {
    font-size: 1.4rem;
    font-weight: 600;
}

.book-description {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.book-details .author {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* Schedule Section */
.schedule-section {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.calendar-nav {
    display: flex;
    gap: var(--spacing-xs);
}

.nav-arrow {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
}

.nav-arrow:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.nav-arrow svg {
    width: 14px;
    height: 14px;
}

.calendar-week {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

.day {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.day:hover {
    background-color: rgba(193, 127, 89, 0.1);
}

.day.active {
    background-color: var(--color-accent-primary);
    color: white;
}

.day-name {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.day.active .day-name {
    color: rgba(255, 255, 255, 0.8);
}

.day-number {
    font-size: 0.95rem;
    font-weight: 600;
}

/* Friends Section */
.friends-section {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.friend-comments {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.friend-comment {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg-primary);
    border-radius: var(--radius-md);
}

.friend-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.comment-content h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.comment-content p {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.comment-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.comment-meta a {
    font-size: 0.75rem;
    color: var(--color-accent-primary);
}

.comment-meta span {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

/* ============================================
   Page Navigation Dots
   ============================================ */
.page-dots {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 100;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background-color: var(--color-border);
    transition: all var(--transition-normal);
}

.dot:hover {
    background-color: var(--color-text-muted);
}

.dot.active {
    background-color: var(--color-accent-primary);
    width: 30px;
    border-radius: 10px;
}

/* ============================================
   Page Header (shared styles for new pages)
   ============================================ */
.page-header {
    margin-bottom: var(--spacing-2xl);
}

.page-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* ============================================
   Library Page Styles
   ============================================ */
.library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.library-book-card {
    display: flex;
    gap: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.library-book-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.library-book-cover {
    width: 100px;
    flex-shrink: 0;
}

.library-book-cover img {
    width: 100%;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-book);
}

.library-book-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.library-book-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.book-author {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

.book-progress {
    margin: var(--spacing-sm) 0;
}

.progress-bar {
    height: 6px;
    background-color: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-highlight));
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.book-progress span {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: transparent;
    border: 2px solid var(--color-accent-primary);
    color: var(--color-accent-primary);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-top: auto;
}

.btn-secondary:hover {
    background-color: var(--color-accent-primary);
    color: white;
}

/* ============================================
   Bookmarks Page Styles
   ============================================ */
.bookmarks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-lg);
}

.bookmark-card {
    text-align: center;
}

.bookmark-cover {
    position: relative;
    margin-bottom: var(--spacing-sm);
}

.bookmark-cover img {
    width: 100%;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-book);
    transition: all var(--transition-normal);
}

.bookmark-cover:hover img {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.bookmark-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.bookmark-btn svg {
    width: 16px;
    height: 16px;
    color: var(--color-text-muted);
}

.bookmark-btn.active svg {
    color: var(--color-accent-primary);
    fill: var(--color-accent-primary);
}

.bookmark-btn:hover {
    transform: scale(1.1);
}

.bookmark-card h4 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.bookmark-date {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* ============================================
   Settings Page Styles
   ============================================ */
.settings-sections {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    max-width: 600px;
}

.settings-section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.settings-section-title svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent-primary);
}

.settings-card {
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.profile-settings {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.profile-avatar-large {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.profile-avatar-large img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-info-edit {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-item label,
.setting-item span {
    font-size: 0.9rem;
    color: var(--color-text-primary);
    flex-shrink: 0;
}

.setting-item input[type="text"] {
    flex: 1;
    min-width: 0;
    max-width: 250px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    margin-left: var(--spacing-md);
    overflow: hidden;
    text-overflow: ellipsis;
}

.setting-item input[type="text"]:focus {
    outline: none;
    border-color: var(--color-accent-primary);
}

.setting-item select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    cursor: pointer;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    width: 48px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked+.toggle-slider {
    background-color: var(--color-accent-primary);
}

.toggle-switch input:checked+.toggle-slider::before {
    transform: translateX(22px);
}

/* Logout Button */
.btn-logout {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: #dc2626;
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-logout svg {
    width: 20px;
    height: 20px;
}

.btn-logout:hover {
    background-color: #b91c1c;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3xl);
    text-align: center;
    color: var(--color-text-muted);
}

.empty-state svg {
    width: 60px;
    height: 60px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    font-size: 0.9rem;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1200px) {

    .content-grid,
    .content-grid-2 {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .right-section {
        justify-content: flex-start;
    }

    .author-card {
        max-width: 100%;
    }

    .content-grid-2 {
        grid-template-columns: 1fr;
    }

    .book-details h2 {
        font-size: 1.3rem;
    }
}

/* Tablet Portrait */
@media (max-width: 768px) {
    .sidebar {
        width: 60px;
    }

    .main-content {
        margin-left: 60px;
        padding: var(--spacing-md);
    }

    .main-title {
        font-size: 1.8rem;
    }

    .greeting {
        font-size: 1.6rem;
    }

    .header {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .search-bar {
        width: 200px;
        flex: 1;
        min-width: 150px;
    }

    .user-name {
        display: none;
    }

    .user-profile {
        gap: var(--spacing-sm);
    }

    .popular-books {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .popular-book {
        width: calc(50% - var(--spacing-sm));
    }

    .current-book-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: var(--spacing-lg);
    }

    .book-3d {
        width: 100px;
        margin-bottom: var(--spacing-md);
    }

    .book-3d img {
        transform: rotateY(0deg);
    }

    .book-details {
        width: 100%;
    }

    .schedule-section {
        padding: var(--spacing-md);
    }

    .calendar-week {
        gap: var(--spacing-xs);
    }

    .day {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .day-name {
        font-size: 0.6rem;
    }

    .day-number {
        font-size: 0.85rem;
    }

    .friends-section {
        padding: var(--spacing-md);
    }

    .friend-comment {
        padding: var(--spacing-sm);
    }

    .section-header h3 {
        font-size: 1rem;
    }

    .books-carousel {
        gap: var(--spacing-md);
    }

    .book-card {
        width: 130px;
    }

    .book-card.featured {
        width: 160px;
    }

    .book-card h4 {
        font-size: 0.75rem;
    }

    .carousel-footer {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .collection-notice {
        flex-direction: column;
        text-align: center;
    }

    .subtitle {
        font-size: 0.85rem;
    }

    .btn-primary {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.85rem;
    }

    .series-item {
        padding: var(--spacing-sm);
    }

    .series-info h4 {
        font-size: 0.8rem;
    }

    .new-series h3,
    .popular-section .section-header h3 {
        font-size: 1rem;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: fixed;
        bottom: 0;
        top: auto;
        left: 0;
        flex-direction: row;
        padding: var(--spacing-sm) var(--spacing-md);
        border-top: 1px solid var(--color-border);
        border-right: none;
        background-color: var(--color-bg-sidebar);
        z-index: 200;
    }

    .logo,
    .sidebar-bottom {
        display: none;
    }

    .nav-menu {
        flex-direction: row;
        gap: var(--spacing-lg);
        justify-content: space-around;
        width: 100%;
    }

    .nav-item {
        width: 48px;
        height: 48px;
    }

    .nav-item.active::before {
        display: none;
    }

    .main-content {
        margin-left: 0;
        margin-bottom: 80px;
        padding: var(--spacing-md);
        width: 100%;
        max-width: 100vw;
    }

    .header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: stretch;
        margin-bottom: var(--spacing-lg);
    }

    .search-bar {
        width: 100%;
        order: 2;
    }

    .user-profile {
        order: 1;
        justify-content: flex-end;
        width: 100%;
    }

    .user-avatar {
        width: 36px;
        height: 36px;
    }

    .notification-btn {
        width: 36px;
        height: 36px;
    }

    .page-dots {
        bottom: 90px;
        left: 50%;
        transform: translateX(-50%);
    }

    /* Content Grid Mobile */
    .content-grid {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }

    .left-section {
        padding-right: 0;
        text-align: center;
    }

    .main-title {
        font-size: 1.6rem;
        line-height: 1.3;
        text-align: center;
    }

    .greeting {
        font-size: 1.5rem;
        text-align: center;
    }

    .subtitle,
    .reading-prompt {
        font-size: 0.85rem;
        max-width: 100%;
        text-align: center;
        margin-left: auto;
        margin-right: auto;
    }

    .btn-primary {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-md);
        margin-top: var(--spacing-md);
    }

    /* Books Section Mobile */
    .books-section {
        margin-top: var(--spacing-lg);
    }

    .books-carousel {
        padding: var(--spacing-md) 0;
        justify-content: center;
        display: flex;
    }

    .book-card {
        width: 140px;
    }

    .book-card.featured {
        width: 180px;
    }

    .book-cover {
        margin-bottom: var(--spacing-sm);
        box-shadow: var(--shadow-lg);
    }

    .book-card.featured .book-cover {
        animation: none;
    }

    .book-card h4 {
        font-size: 0.8rem;
        text-align: center;
    }

    .carousel-footer {
        flex-direction: column;
        gap: var(--spacing-md);
        padding-top: var(--spacing-md);
        margin-top: var(--spacing-md);
        text-align: center;
    }

    .collection-notice {
        font-size: 0.8rem;
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-xs);
    }

    .collection-notice svg {
        display: none;
    }

    .book-counter {
        font-size: 0.85rem;
    }

    .book-counter .current {
        font-size: 1.1rem;
    }

    /* Page 2 Mobile */
    .content-grid-2 {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .left-section-2 {
        padding-right: 0;
    }

    .right-section-2 {
        order: -1;
    }

    .popular-section {
        margin-top: var(--spacing-xl);
    }

    .section-header h3 {
        font-size: 1rem;
    }

    .popular-books {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .popular-book {
        width: 100%;
    }

    .popular-book img {
        width: 100%;
        aspect-ratio: 2/3;
    }

    .popular-book span {
        font-size: 0.75rem;
    }

    .current-book-card {
        padding: var(--spacing-lg);
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .book-3d {
        width: 100px;
        margin-bottom: var(--spacing-md);
    }

    .book-3d img {
        transform: none;
    }

    .book-details {
        width: 100%;
    }

    .book-details h2 {
        font-size: 1.2rem;
    }

    .progress-info {
        font-size: 0.85rem;
    }

    .progress-info .pages-read {
        font-size: 1.2rem;
    }

    .book-description {
        font-size: 0.85rem;
    }

    /* Schedule Section Mobile */
    .schedule-section {
        padding: var(--spacing-md);
    }

    .calendar-week {
        justify-content: space-between;
        gap: var(--spacing-xs);
    }

    .day {
        padding: var(--spacing-xs);
        min-width: 38px;
        flex: 1;
    }

    .day-name {
        font-size: 0.65rem;
    }

    .day-number {
        font-size: 0.9rem;
    }

    /* Friends Section Mobile */
    .friends-section {
        padding: var(--spacing-md);
    }

    .friend-avatar {
        width: 36px;
        height: 36px;
    }

    .comment-content h4 {
        font-size: 0.85rem;
    }

    .comment-content p {
        font-size: 0.8rem;
    }

    .comment-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
        align-items: flex-start;
    }

    /* New Series Mobile */
    .new-series {
        margin-top: var(--spacing-xl);
    }

    .series-item {
        padding: var(--spacing-md);
    }

    .series-item img {
        width: 45px;
        height: 60px;
    }

    .series-info h4 {
        font-size: 0.85rem;
    }
}

/* ============================================
   Animations & Micro-interactions
   ============================================ */
@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.book-card.featured .book-cover {
    animation: float 4s ease-in-out infinite;
}

/* Loading States */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* Scroll Progress */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-highlight));
    z-index: 1000;
    transition: width var(--transition-fast);
}

/* Focus Styles for Accessibility */
:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}

/* Selection Styles */
::selection {
    background-color: var(--color-accent-primary);
    color: white;
}

/* ============================================
   Login Screen
   ============================================ */
.login-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, #e8e0d5 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.5s ease;
}

.login-screen.hidden {
    animation: fadeOut 0.5s ease forwards;
    pointer-events: none;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: scale(1.05);
    }
}

.login-container {
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3xl);
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(193, 127, 89, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    position: relative;
    z-index: 1;
}

.login-logo {
    width: 60px;
    height: 60px;
    color: var(--color-accent-primary);
    margin-bottom: var(--spacing-md);
    animation: float 3s ease-in-out infinite;
}

.login-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.login-subtitle {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.login-form {
    position: relative;
    z-index: 1;
}

.input-group {
    margin-bottom: var(--spacing-lg);
}

.input-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: all var(--transition-normal);
}

.input-wrapper:focus-within {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(193, 127, 89, 0.15);
}

.input-wrapper svg {
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
    flex-shrink: 0;
    margin-right: var(--spacing-sm);
}

.input-wrapper input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 0.95rem;
    color: var(--color-text-primary);
    outline: none;
    padding: var(--spacing-sm) 0;
}

.input-wrapper input::placeholder {
    color: var(--color-text-muted);
}

.login-error {
    display: none;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    color: #dc2626;
    font-size: 0.85rem;
    animation: shake 0.5s ease;
}

.login-error.show {
    display: flex;
}

.login-error svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

.login-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    background-color: var(--color-text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-xl);
    font-size: 1rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-md);
}

.login-btn:hover {
    background-color: var(--color-accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.login-btn:active {
    transform: translateY(0);
}

.login-btn svg {
    width: 20px;
    height: 20px;
}

.login-btn.loading {
    pointer-events: none;
    opacity: 0.8;
}

.login-btn.loading span {
    display: none;
}

.login-btn.loading::after {
    content: 'Verificando...';
}

.login-footer {
    margin-top: var(--spacing-2xl);
    text-align: center;
    position: relative;
    z-index: 1;
}

.book-decoration {
    display: flex;
    justify-content: center;
}

.book-decoration img {
    width: 80px;
    height: auto;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-book);
    transform: rotate(-5deg);
    transition: all var(--transition-normal);
    animation: float 4s ease-in-out infinite;
    animation-delay: 0.5s;
}

.book-decoration img:hover {
    transform: rotate(0deg) scale(1.1);
}

/* Login Responsive */
@media (max-width: 480px) {
    .login-container {
        margin: var(--spacing-md);
        padding: var(--spacing-xl);
    }

    .login-title {
        font-size: 1.5rem;
    }
}

/* ============================================
   PDF Reader Overlay
   ============================================ */
.reader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    display: none;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.reader-overlay.active {
    display: flex;
    opacity: 1;
}

.reader-container {
    width: 100%;
    max-width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm);
}

/* Reader Header */
.reader-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.reader-close-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: white;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.reader-close-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.reader-close-btn svg {
    width: 24px;
    height: 24px;
}

.reader-title {
    text-align: center;
    color: white;
}

.reader-title h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.reader-page-info {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

.reader-page-info span {
    color: var(--color-accent-primary);
    font-weight: 600;
}

/* Download Button */
.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-highlight));
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {

    0%,
    100% {
        box-shadow: 0 0 5px rgba(193, 127, 89, 0.5);
    }

    50% {
        box-shadow: 0 0 20px rgba(193, 127, 89, 0.8);
    }
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(193, 127, 89, 0.4);
}

.download-btn svg {
    width: 18px;
    height: 18px;
}

.download-btn.downloading {
    pointer-events: none;
    animation: none;
}

.download-btn.downloading svg {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* 3D Book Container */
.book-3d-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 2000px;
    overflow: hidden;
    padding: 0;
    margin: 0;
}

#readerOverlay .book-3d {
    position: relative;
    width: 100%;
    max-width: 95vw;
    height: 85vh;
    max-height: none;
    display: flex;
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
}

.book-3d:hover {
    transform: rotateY(-5deg);
}

.book-page {
    position: relative;
    width: auto;
    height: 100%;
    max-height: 90vh;
    background-color: #f5f0e8;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: transform 0.4s ease;
}

.book-page canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

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

/* Single page mode - center the page */
.book-page-left {
    margin: 0 auto;
    transform-origin: center center;
}

.book-page-right {
    display: none;
}

/* Page flip animations */
.book-page.flipping-left {
    animation: flipLeft 0.4s ease;
}

.book-page.flipping-right {
    animation: flipRight 0.4s ease;
}

@keyframes flipLeft {
    0% {
        transform: perspective(1000px) rotateY(0deg);
    }

    50% {
        transform: perspective(1000px) rotateY(-90deg);
    }

    100% {
        transform: perspective(1000px) rotateY(0deg);
    }
}

@keyframes flipRight {
    0% {
        transform: perspective(1000px) rotateY(0deg);
    }

    50% {
        transform: perspective(1000px) rotateY(90deg);
    }

    100% {
        transform: perspective(1000px) rotateY(0deg);
    }
}

.book-cover-front,
.book-cover-back {
    display: none;
}

.book-cover-front.show {
    display: flex;
    left: 0;
    width: 100%;
    border-radius: var(--radius-md);
}

.book-cover-back.show {
    display: flex;
    right: 0;
    width: 100%;
    border-radius: var(--radius-md);
}

/* Page Flip Animation */
.book-page.flipping-left {
    animation: flipLeft 0.6s ease forwards;
}

.book-page.flipping-right {
    animation: flipRight 0.6s ease forwards;
}

@keyframes flipLeft {
    0% {
        transform: rotateY(0deg);
    }

    100% {
        transform: rotateY(-180deg);
    }
}

@keyframes flipRight {
    0% {
        transform: rotateY(0deg);
    }

    100% {
        transform: rotateY(180deg);
    }
}

/* Reader Navigation */
/* Reader Main Area */
.reader-main {
    flex: 1;
    display: flex;
    gap: var(--spacing-md);
    overflow: hidden;
}

/* Fullscreen Button */
.fullscreen-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.fullscreen-btn:hover {
    background-color: var(--color-accent-primary);
    transform: scale(1.1);
}

.fullscreen-btn svg {
    width: 20px;
    height: 20px;
}

/* Zoom Lens */
.zoom-lens {
    position: absolute;
    width: 150px;
    height: 150px;
    border: 3px solid var(--color-accent-primary);
    border-radius: 50%;
    background-repeat: no-repeat;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.3);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 100;
    display: none;
}

.zoom-lens.active {
    opacity: 1;
    display: block;
}

/* Right Sidebar */
.reader-sidebar {
    width: 80px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.sidebar-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    height: 100%;
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.control-label {
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
}

.control-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.control-btn:hover {
    background-color: var(--color-accent-primary);
    transform: scale(1.1);
}

.control-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
}

.control-btn svg {
    width: 20px;
    height: 20px;
}

.page-indicator,
.zoom-indicator {
    font-size: 0.75rem;
    color: white;
    font-weight: 600;
    text-align: center;
}

/* Progress Group */
.progress-group {
    flex: 1;
    justify-content: flex-start;
}

.sidebar-progress {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    width: 100%;
}

.progress-bar-vertical {
    width: 8px;
    flex: 1;
    min-height: 100px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-fill-vertical {
    position: absolute;
    bottom: 0;
    width: 100%;
    background: linear-gradient(0deg, var(--color-accent-primary), var(--color-accent-highlight));
    border-radius: var(--radius-full);
    transition: height 0.3s ease;
}

.progress-text {
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Reader Responsive Styles */
@media (max-width: 768px) {
    .reader-container {
        padding: var(--spacing-xs);
    }

    .reader-header {
        padding: var(--spacing-sm);
        margin-bottom: var(--spacing-sm);
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .reader-title {
        order: 3;
        width: 100%;
        text-align: center;
    }

    .reader-title h3 {
        font-size: 0.9rem;
    }

    .reader-page-info {
        font-size: 0.75rem;
    }

    .reader-actions {
        gap: var(--spacing-xs);
    }

    .download-text {
        display: none;
    }

    .reader-main {
        flex-direction: column;
    }

    /* Hide sidebar on mobile, show floating controls */
    .reader-sidebar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        height: auto;
        flex-direction: row;
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        padding: var(--spacing-sm);
        z-index: 100;
    }

    .sidebar-controls {
        flex-direction: row;
        justify-content: space-around;
        width: 100%;
    }

    .control-group {
        flex-direction: row;
        gap: var(--spacing-xs);
    }

    .control-label {
        display: none;
    }

    .progress-group {
        flex: 0;
    }

    .sidebar-progress {
        flex-direction: row;
        gap: var(--spacing-sm);
    }

    .progress-bar-vertical {
        width: 60px;
        height: 6px;
        min-height: auto;
    }

    .progress-fill-vertical {
        height: 100% !important;
        width: 0;
        bottom: auto;
        left: 0;
        transition: width 0.3s ease;
    }

    /* Zoom lens disabled on mobile */
    .zoom-lens {
        display: none !important;
    }

    .book-3d-container {
        padding-bottom: 70px;
        /* Space for floating controls */
    }
}

@media (max-width: 480px) {

    .reader-close-btn,
    .fullscreen-btn,
    .control-btn {
        width: 36px;
        height: 36px;
    }

    .control-btn svg {
        width: 16px;
        height: 16px;
    }

    .page-indicator,
    .zoom-indicator {
        font-size: 0.65rem;
    }
}

/* Download Toast */
.download-toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 500;
    box-shadow: 0 10px 40px rgba(16, 185, 129, 0.4);
    z-index: 10000;
    transition: bottom 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.download-toast.show {
    bottom: var(--spacing-xl);
}

.download-toast svg {
    width: 24px;
    height: 24px;
}

/* Responsive Reader */
@media (max-width: 768px) {
    .reader-header {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    .reader-close-btn {
        position: absolute;
        top: var(--spacing-md);
        right: var(--spacing-md);
    }

    .download-btn .download-text {
        display: none;
    }

    .book-3d {
        max-height: 60vh;
    }

    .reader-navigation {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }

    .nav-btn {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .nav-btn span {
        display: none;
    }

    .page-progress-bar {
        order: -1;
        width: 100%;
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .reader-container {
        padding: var(--spacing-sm);
    }

    .book-3d {
        max-height: 50vh;
    }

    .reader-title h3 {
        font-size: 1rem;
    }
}

/* ============================================
   Christmas Gift Details Page
   ============================================ */
.gift-details-page {
    background: var(--color-bg-primary);
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

.christmas-wrapper {
    padding: var(--spacing-2xl);
    max-width: 1000px;
    margin: 0 auto;
}

/* Snowfall Animation */
.snowflakes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.snowflake {
    position: absolute;
    color: var(--color-accent-primary);
    font-size: 1.2rem;
    animation: fall linear infinite;
    opacity: 0.3;
}

.snowflake:nth-child(1) {
    left: 10%;
    animation-duration: 8s;
    animation-delay: 0s;
}

.snowflake:nth-child(2) {
    left: 30%;
    animation-duration: 10s;
    animation-delay: 1s;
    font-size: 2rem;
}

.snowflake:nth-child(3) {
    left: 50%;
    animation-duration: 7s;
    animation-delay: 2s;
}

.snowflake:nth-child(4) {
    left: 70%;
    animation-duration: 9s;
    animation-delay: 0.5s;
    font-size: 1.8rem;
}

.snowflake:nth-child(5) {
    left: 90%;
    animation-duration: 11s;
    animation-delay: 1.5s;
}

@keyframes fall {
    0% {
        top: -10%;
        transform: translateX(0) rotate(0deg);
    }

    100% {
        top: 110%;
        transform: translateX(100px) rotate(360deg);
    }
}

/* Gift Content */
.gift-content {
    display: flex;
    gap: var(--spacing-2xl);
    align-items: center;
    position: relative;
    z-index: 2;
}

.gift-video-container {
    flex: 1;
    max-width: 400px;
}

.gift-main-video {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 3px solid var(--color-accent-primary);
}

/* Gift Message */
.gift-message {
    flex: 1;
    text-align: center;
}

.gift-message h1 {
    font-family: var(--font-display);
    font-size: 2.2rem;
    margin-bottom: var(--spacing-xl);
    color: var(--color-accent-primary);
}

.message-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.christmas-greeting {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.signature {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--color-accent-primary);
    font-style: italic;
    margin-top: var(--spacing-lg);
}

/* Christmas Wishes */
.christmas-wishes {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.wish {
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-highlight));
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: white;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.wish:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Back Button */
.btn-back-home {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: var(--spacing-2xl) auto 0;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    z-index: 2;
}

.btn-back-home:hover {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
    color: white;
    transform: translateY(-2px);
}

.btn-back-home svg {
    width: 20px;
    height: 20px;
}

/* Responsive Gift Page */
@media (max-width: 768px) {
    .gift-content {
        flex-direction: column;
        text-align: center;
    }

    .gift-image-container {
        max-width: 300px;
    }

    .gift-message h1 {
        font-size: 1.8rem;
    }

    .christmas-greeting {
        font-size: 1rem;
    }
}