/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Merriweather:ital,wght@0,300;0,400;0,700;0,900;1,300&display=swap');

/* CSS Custom Properties / Design Tokens */
:root {
    --primary: #3A4A3A;         /* Military olive green */
    --secondary: #D4A574;       /* Tan/khaki */
    --bg-main: #FAFAFA;         /* Off-white background */
    --bg-card: #FFFFFF;         /* White card background */
    --text-main: #2C2C2C;       /* Dark charcoal */
    --text-muted: #555555;      /* Slate grey */
    --accent: #8B4513;          /* Saddle brown */
    --accent-hover: #A0522D;    /* Saddle brown hover */
    --border-color: #E6EBE6;    /* Light matching border */
    
    --header-bg: rgba(250, 250, 250, 0.85);
    
    /* Cover Gradients */
    --cover-green-dark: linear-gradient(135deg, #293529 0%, #151B15 100%);
    --cover-green-medium: linear-gradient(135deg, #3A4A3A 0%, #222B22 100%);
    --cover-brown: linear-gradient(135deg, #592E0F 0%, #301807 100%);
    --cover-tan-dark: linear-gradient(135deg, #B07E4D 0%, #7B522A 100%);
    --cover-tan-medium: linear-gradient(135deg, #D4A574 0%, #A57C4F 100%);
    --cover-tan-light: linear-gradient(135deg, #E0B88F 0%, #BD946A 100%);
    --cover-charcoal: linear-gradient(135deg, #2D2D2D 0%, #171717 100%);
    
    /* Transitions & Shadows */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 12px rgba(58, 74, 58, 0.05);
    --shadow-lg: 0 12px 24px rgba(58, 74, 58, 0.08);
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --bg-main: #141A14;         /* Deep military green-black */
    --bg-card: #1C241C;         /* Muted dark card */
    --text-main: #E5EBE5;       /* Warm light grey */
    --text-muted: #9BB09B;      /* Desaturated green-grey */
    --border-color: #293429;    /* Dark olive border */
    --header-bg: rgba(20, 26, 20, 0.85);
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.4);
    
    --cover-green-dark: linear-gradient(135deg, #3A4E3A 0%, #202D20 100%);
    --cover-green-medium: linear-gradient(135deg, #4A5F4A 0%, #2E3B2E 100%);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    transition: var(--transition);
}

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

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Merriweather', serif;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.text-uppercase {
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 5rem 0;
}

/* Sticky Header */
header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 100;
    background-color: var(--header-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.15rem;
    font-weight: 700;
    font-family: 'Merriweather', serif;
}

.logo-badge {
    background-color: var(--primary);
    color: #FAFAFA;
    font-family: 'Inter', sans-serif;
    font-weight: 800;
    font-size: 0.9rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

[data-theme="dark"] .logo-badge {
    background-color: var(--secondary);
    color: #141A14;
}

/* Navigation Links */
.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 2rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 0;
    opacity: 0.85;
}

.nav-link:hover, .nav-link.active {
    opacity: 1;
    color: var(--primary);
}

[data-theme="dark"] .nav-link:hover {
    color: var(--secondary);
}

.nav-link svg {
    width: 12px;
    height: 12px;
    transition: transform 0.2s ease;
}

.nav-item:hover .nav-link svg {
    transform: translateY(2px);
}

/* Dropdown styling */
.dropdown-content {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 120;
    padding: 1rem;
}

.nav-item:hover .dropdown-content,
.nav-item.active-dropdown .dropdown-content {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* Top 5 Essential dropdown specific */
.dropdown-essential {
    width: 380px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.essential-item {
    display: flex;
    gap: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.essential-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.essential-cover {
    width: 50px;
    height: 75px;
    flex-shrink: 0;
}

.essential-info {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.essential-title {
    font-size: 0.85rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.15rem;
}

.essential-author {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.essential-desc {
    font-size: 0.75rem;
    line-height: 1.3;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
}

.essential-buy {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    margin-top: 0.25rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.essential-buy:hover {
    color: var(--accent-hover);
}

/* Categories dropdown specific */
.dropdown-categories {
    width: 480px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 1.25rem;
}

.dropdown-col-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--secondary);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0.5rem;
}

.dropdown-cat-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    list-style: none;
}

.dropdown-cat-link {
    font-size: 0.8rem;
    font-weight: 400;
    opacity: 0.85;
}

.dropdown-cat-link:hover {
    opacity: 1;
    color: var(--primary);
    transform: translateX(3px);
}

[data-theme="dark"] .dropdown-cat-link:hover {
    color: var(--secondary);
}

/* Actions in Header */
.header-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.action-btn {
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: transparent;
}

.action-btn:hover {
    background-color: var(--border-color);
}

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

/* Hamburger menu button for mobile */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 24px;
    height: 24px;
    justify-content: center;
    z-index: 150;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-main);
    transition: var(--transition);
}

/* Hamburger open state */
.hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
    opacity: 0;
}

.hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Hero Section */
.hero-section {
    position: relative;
    padding: 7rem 0 5rem 0;
    background-color: var(--bg-main);
    background-image: repeating-linear-gradient(
        -45deg,
        rgba(212, 165, 116, 0.025),
        rgba(212, 165, 116, 0.025) 1px,
        transparent 1px,
        transparent 8px
    );
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 0.35rem 1rem;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    background-color: var(--bg-card);
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.15;
    color: var(--text-main);
    max-width: 800px;
    margin: 0 auto 1rem auto;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
}

/* Search Bar in Hero */
.search-wrapper {
    position: relative;
    max-width: 650px;
    width: 100%;
    margin: 0 auto 1.5rem auto;
    box-shadow: var(--shadow-lg);
    border-radius: 50px;
}

.search-input-container {
    display: flex;
    align-items: center;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    padding: 6px 6px 6px 20px;
    transition: var(--transition);
}

.search-input-container:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(58, 74, 58, 0.15);
}

[data-theme="dark"] .search-input-container:focus-within {
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.15);
}

.search-icon-left {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    margin-right: 12px;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-main);
}

.search-input::placeholder {
    color: #999;
}

[data-theme="dark"] .search-input::placeholder {
    color: #778;
}

.search-btn {
    background-color: var(--primary);
    color: #FAFAFA;
    padding: 0.75rem 1.75rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-btn:hover {
    opacity: 0.95;
    transform: translateY(-1px);
}

[data-theme="dark"] .search-btn {
    background-color: var(--secondary);
    color: #141A14;
}

/* Browse Categories Button */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--accent);
    color: #FFFFFF;
    padding: 0.85rem 1.75rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: var(--shadow-md);
}

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

.cta-button svg {
    width: 16px;
    height: 16px;
}

/* YouTube Subscribe Button (header) */
.yt-subscribe-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: #FF0000;
    color: #FFFFFF;
    padding: 0.4rem 0.9rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    transition: var(--transition);
    white-space: nowrap;
}

.yt-subscribe-btn:hover {
    background-color: #CC0000;
    transform: translateY(-1px);
    color: #FFFFFF;
}

/* Ko-fi Support Button (header) */
.kofi-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: #29ABE0;
    color: #FFFFFF;
    padding: 0.4rem 0.9rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    transition: var(--transition);
    white-space: nowrap;
}

.kofi-btn:hover {
    background-color: #1a91c5;
    transform: translateY(-1px);
    color: #FFFFFF;
}

@media (max-width: 768px) {
    .kofi-btn span {
        display: none;
    }
}

.footer-yt-link {
    color: var(--accent) !important;
    display: inline-flex;
    align-items: center;
}

.footer-yt-link:hover {
    color: var(--accent-hover) !important;
}

@media (max-width: 768px) {
    .yt-subscribe-btn span {
        display: none;
    }
}

/* Search bar modal popup overlay */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(20, 26, 20, 0.95);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 10%;
}

.search-overlay.open {
    opacity: 1;
    visibility: visible;
}

.search-overlay-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    color: #FFFFFF;
    font-size: 2rem;
}

.search-overlay-content {
    width: 100%;
    max-width: 700px;
    padding: 0 2rem;
    text-align: center;
}

.search-overlay h2 {
    color: #FFFFFF;
    margin-bottom: 2rem;
}

/* Section Headers */
.section-header {
    margin-bottom: 3rem;
}

.section-label {
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--secondary);
    margin-bottom: 0.5rem;
    display: block;
}

.section-title {
    font-size: 2.25rem;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 600px;
}

/* Carousel Section */
.carousel-section {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
}

.carousel-container {
    position: relative;
    width: 100%;
}

.carousel-track-container {
    overflow: hidden;
    width: 100%;
    padding: 1rem 0;
}

.carousel-track {
    display: flex;
    gap: 2rem;
    transition: transform 0.5s ease-out;
}

.carousel-slide {
    flex: 0 0 calc(25% - 1.5rem);
    min-width: 240px;
    display: flex;
    flex-direction: column;
}

.carousel-btn {
    position: absolute;
    top: 45%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    color: var(--text-main);
}

.carousel-btn:hover {
    background-color: var(--primary);
    color: #FAFAFA;
}

[data-theme="dark"] .carousel-btn:hover {
    background-color: var(--secondary);
    color: #141A14;
}

.carousel-btn-prev {
    left: -22px;
}

.carousel-btn-next {
    right: -22px;
}

/* CSS Book Cover Template styling */
.book-cover-css {
    aspect-ratio: 2 / 3;
    position: relative;
    border-radius: 4px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15), 0 3px 6px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 1.5rem 1.25rem;
    color: #FFFFFF;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.book-cover-css:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.22), 0 5px 10px rgba(0, 0, 0, 0.15);
}

/* Diagonal stripes overlay */
.book-cover-css::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: repeating-linear-gradient(
        -45deg,
        rgba(255, 255, 255, 0.015),
        rgba(255, 255, 255, 0.015) 1px,
        transparent 1px,
        transparent 10px
    );
    pointer-events: none;
    z-index: 2;
}

/* Page Spine Effect */
.book-cover-css::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 10px;
    height: 100%;
    background: linear-gradient(to right, rgba(0,0,0,0.2) 0%, rgba(255,255,255,0.05) 50%, rgba(0,0,0,0.15) 100%);
    pointer-events: none;
    z-index: 2;
}

.cover-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.cover-fallback {
    position: relative;
    z-index: 1;
    height: 100%;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}


.cover-title {
    font-family: 'Merriweather', serif;
    font-size: 1.05rem;
    font-weight: 900;
    line-height: 1.25;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.cover-author {
    font-family: 'Inter', sans-serif;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    opacity: 0.9;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    margin-top: auto;
}

/* Outer Book details (below cover) */
.book-info-external {
    padding: 0.75rem 0.25rem;
}

.book-title-ext {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.2rem;
    font-family: 'Merriweather', serif;
    color: var(--text-main);
}

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

/* Map colors */
.bg-green-dark { background: var(--cover-green-dark); }
.bg-green-medium { background: var(--cover-green-medium); }
.bg-brown { background: var(--cover-brown); }
.bg-tan-dark { background: var(--cover-tan-dark); }
.bg-tan-medium { background: var(--cover-tan-medium); }
.bg-tan-light { background: var(--cover-tan-light); }
.bg-charcoal { background: var(--cover-charcoal); }

/* Documentaries Section */
.docs-section {
    background-color: var(--bg-main);
    border-bottom: 1px solid var(--border-color);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.doc-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.doc-video-placeholder {
    width: 100%;
    aspect-ratio: 2 / 3;
    background-color: #F0F3F0;
    border-radius: 4px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    position: relative;
}

[data-theme="dark"] .doc-video-placeholder {
    background-color: #242E24;
}

.doc-cover-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
    z-index: 1;
}

.doc-fallback {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}


.doc-video-placeholder svg {
    width: 40px;
    height: 40px;
    opacity: 0.5;
}

.doc-title {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.5rem;
}

.doc-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
    margin-bottom: 1.25rem;
    flex: 1;
}

.doc-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.doc-year-badge {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    background-color: rgba(212, 165, 116, 0.15);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.doc-watch-link {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    background-color: var(--bg-main);
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.doc-watch-link:hover {
    background-color: var(--primary);
    color: #FFFFFF;
}

[data-theme="dark"] .doc-watch-link:hover {
    background-color: var(--secondary);
    color: #141A14;
}

/* Categories Section */
.categories-section {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.category-card {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-3px);
    border-color: var(--secondary);
    box-shadow: var(--shadow-md);
}

.category-tag {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--secondary);
    background-color: rgba(212, 165, 116, 0.1);
    border: 1px solid rgba(212, 165, 116, 0.2);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    align-self: flex-start;
    margin-bottom: 0.75rem;
}

.category-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.category-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    flex: 1;
}

.category-link {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.category-link:hover {
    color: var(--accent-hover);
}

/* Dynamic Filter / Shelf View */
.shelf-section {
    display: none;
    background-color: var(--bg-main);
    padding-top: 6rem;
}

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

.shelf-title-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    background-color: var(--bg-card);
}

.btn-back:hover {
    background-color: var(--primary);
    color: #FFFFFF;
}

[data-theme="dark"] .btn-back:hover {
    background-color: var(--secondary);
    color: #141A14;
}

.shelf-books-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

@media (max-width: 992px) {
    .shelf-books-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .shelf-books-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .shelf-books-grid {
        grid-template-columns: 1fr;
    }
}

/* Detail Book Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(20, 26, 20, 0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

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

.modal-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    padding: 2.5rem;
    animation: modalSlideUp 0.35s cubic-bezier(0.4, 0, 0.2, 1);

    /* Force scrollbar visibility */
    scrollbar-width: thin;
    scrollbar-color: var(--secondary) transparent;
}

.modal-content::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
.modal-content::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}
.modal-content::-webkit-scrollbar-thumb {
    background-color: var(--secondary);
    border-radius: 4px;
}

@keyframes modalSlideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-close {
    position: sticky;
    top: 0;
    float: right;
    margin-top: -1.25rem;
    margin-right: -1.25rem;
    z-index: 100;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    background: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.modal-close:hover {
    color: var(--text-main);
    background-color: var(--bg-main);
}

.modal-body {
    display: flex;
    gap: 2.5rem;
}

.modal-left {
    width: 200px;
    flex-shrink: 0;
    align-self: flex-start;
}

.modal-right {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.modal-tag {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 0.5rem;
    display: block;
}

.modal-title {
    font-size: 2rem;
    margin-bottom: 0.25rem;
    line-height: 1.2;
}

.modal-author {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.modal-meta-row {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.modal-meta-label {
    font-weight: 600;
    color: var(--text-main);
}

.modal-desc {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.modal-citation {
    background-color: var(--bg-main);
    border-left: 3px solid var(--primary);
    padding: 1rem 1.25rem;
    border-radius: 0 4px 4px 0;
    font-size: 0.85rem;
    margin-bottom: 2rem;
}

[data-theme="dark"] .modal-citation {
    border-left-color: var(--secondary);
}

.modal-citation-title {
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.modal-cta-btn {
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--accent);
    color: #FFFFFF;
    padding: 0.85rem 2rem;
    border-radius: 4px;
    font-weight: 700;
    font-size: 1rem;
    box-shadow: var(--shadow-md);
}

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

/* ===== ABOUT & CONTACT PAGES ===== */
.about-page,
.contact-page {
    background-color: var(--bg-main);
    padding: 7rem 0 5rem;
    min-height: 80vh;
}

.about-inner,
.contact-inner {
    max-width: 720px;
}

.about-header {
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 2rem;
}

.about-title {
    font-size: 2.5rem;
    color: var(--text-main);
    line-height: 1.2;
    margin-top: 0.5rem;
}

.about-body,
.contact-body {
    display: flex;
    flex-direction: column;
    gap: 1.4rem;
}

.about-body p,
.contact-body p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-main);
}

/* Cat photo */
.about-cats-figure {
    margin: 1rem 0;
}

.about-cats-img {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    display: block;
}

.about-cats-figure figcaption {
    margin-top: 0.6rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Contact email block */
.contact-email-block {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent);
    border-radius: 0 8px 8px 0;
    padding: 1.25rem 1.75rem;
    display: inline-block;
}

.contact-email-link {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.01em;
    text-decoration: none;
    transition: var(--transition);
}

.contact-email-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.contact-note {
    color: var(--text-muted) !important;
    font-size: 0.9rem !important;
    font-style: italic;
}

@media (max-width: 768px) {
    .about-title {
        font-size: 1.8rem;
    }
    .about-page,
    .contact-page {
        padding: 6rem 0 4rem;
    }
}

/* Footer Section */
footer {
    background-color: var(--bg-main);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.25rem;
    color: var(--text-main);
}

.footer-about p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-link {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-link:hover {
    color: var(--primary);
    transform: translateX(2px);
}

[data-theme="dark"] .footer-link:hover {
    color: var(--secondary);
}

.footer-disclosure p {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== RESPONSIVE RULES ===== */

/* Tablet — 992px */
@media (max-width: 992px) {
    .logo-resources-text {
        display: none;
    }

    section {
        padding: 4rem 0;
    }

    .hero-title {
        font-size: 2.75rem;
    }

    .carousel-slide {
        flex: 0 0 calc(33.333% - 1.33rem);
    }

    .docs-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }

    .footer-col-full {
        grid-column: span 2;
    }
}

/* Mobile — 768px */
@media (max-width: 768px) {
    .logo-the-text {
        display: none;
    }
    
    .logo-resources-text {
        display: none;
    }

    .logo {
        font-size: 1.05rem;
        white-space: nowrap;
    }

    .header-actions {
        gap: 0.75rem;
    }

    .book-cover-css {
        padding: 1rem 0.75rem;
    }
    .cover-title {
        font-size: 0.85rem;
    }
    .cover-author {
        font-size: 0.6rem;
    }

    /* Nav */
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--bg-card);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        box-shadow: var(--shadow-md);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: var(--transition);
        z-index: 99;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }

    .nav-menu.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .hamburger {
        display: flex;
    }

    .nav-item {
        width: 100%;
        text-align: center;
    }

    .nav-item:hover .dropdown-content {
        display: none;
    }

    .nav-item.mobile-expanded .dropdown-content {
        display: block !important;
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        width: 100%;
        box-shadow: none;
        border: none;
        border-top: 1px solid var(--border-color);
        margin-top: 0.5rem;
        padding-top: 1rem;
    }

    .dropdown-categories {
        grid-template-columns: 1fr;
        width: 100%;
    }

    .dropdown-essential {
        width: 100%;
    }

    /* Header action buttons — shrink labels */
    .yt-subscribe-btn,
    .kofi-btn {
        font-size: 0;       /* hide text */
        padding: 0.4rem 0.55rem;
        gap: 0;
    }

    .yt-subscribe-btn svg,
    .kofi-btn svg {
        width: 18px;
        height: 18px;
    }

    /* Hero */
    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    /* Carousel */
    .carousel-slide {
        flex: 0 0 calc(50% - 1rem);
    }

    /* Modal */
    .modal-overlay {
        padding: 1rem;
        align-items: flex-end;
    }

    .modal-content {
        padding: 1.75rem;
        max-height: 90vh;
        border-radius: 12px 12px 0 0;
    }

    .modal-body {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }

    .modal-left {
        width: 140px;
    }

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

    /* About page */
    .about-title {
        font-size: 1.8rem;
    }

    .about-cats-img {
        max-width: 100%;
    }

    .about-page,
    .contact-page {
        padding: 6rem 0 4rem;
    }
}

/* Small phones — 576px */
@media (max-width: 576px) {
    .logo {
        font-size: 0.95rem;
    }

    .header-actions {
        gap: 0.5rem;
    }

    .container {
        padding: 0 1.25rem;
    }

    .hero-title {
        font-size: 1.85rem;
    }

    .hero-badge {
        font-size: 0.65rem;
    }

    .search-input-container {
        padding: 4px 4px 4px 14px;
    }

    .search-btn {
        padding: 0.65rem 1.25rem;
        font-size: 0.85rem;
    }

    /* Carousel single column */
    .carousel-slide {
        flex: 0 0 100%;
    }

    .docs-grid {
        grid-template-columns: 1fr;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    /* Footer single column */
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-col-full {
        grid-column: span 1;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    /* Shelf grid two columns on phones */
    .shelf-books-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    /* Contact email */
    .contact-email-block {
        display: block;
        word-break: break-all;
    }

    .contact-email-link {
        font-size: 0.95rem;
    }
}

/* Extra Small phones — 480px */
@media (max-width: 480px) {
    .shelf-books-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .book-cover-css {
        padding: 0.85rem 0.6rem;
    }
    .cover-title {
        font-size: 0.75rem;
    }
    .cover-author {
        font-size: 0.55rem;
    }
}