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

:root {
    /* Colors */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --accent: #ec4899;
    --text: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg: #ffffff;
    --border: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --warning-dark: #92400e;

    /* Gradients */
    --bg-gradient: linear-gradient(135deg, #f5f3ff 0%, #fdf2f8 100%);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 28px rgba(0, 0, 0, 0.12);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

html.dark-theme {
    --primary: #818cf8;
    --primary-light: #a5b4fc;
    --primary-dark: #6366f1;
    --accent: #f472b6;
    --text: #e5e7eb;
    --text-light: #9ca3af;
    --bg-light: #1f2937;
    --bg: #111827;
    --border: #374151;
    --bg-gradient: linear-gradient(135deg, #111827 0%, #1f2937 100%);
    --warning-light: #78350f;
    --warning-dark: #fef3c7;
}

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-gradient);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition:
        background-color 0.3s ease,
        color 0.3s ease;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Theme Switcher */
.theme-switcher {
    display: flex;
    gap: 0.5rem;
    background: transparent;
    border: none;
    border-radius: 0.75rem;
    padding: 0;
    box-shadow: none;
    align-items: center;
}

.theme-button {
    width: 2.5rem;
    height: 2.5rem;
    border: none;
    border-radius: 0.5rem;
    background: transparent;
    color: var(--text-light);
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-button:hover {
    background: var(--bg-light);
    color: var(--text);
}

.theme-button.active {
    background: var(--primary);
    color: white;
}

@media (max-width: 640px) {
    .theme-button {
        width: 2.2rem;
        height: 2.2rem;
        font-size: 1rem;
    }
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--spacing-3xl) 0 3rem;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 8vw, 3.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-light);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.05em;
}

.intro {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 0;
    line-height: 1.8;
}

/* Navigation */
.main-nav {
    text-align: center;
    margin: 2.5rem 0;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-link {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    color: var(--text);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.nav-link:hover {
    border-color: var(--primary);
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(99, 102, 241, 0.3);
}

/* Main Content */
main {
    flex: 1;
    margin: 2rem 0;
}

.featured h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    text-align: center;
    color: var(--text);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
}

.video-container iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    border: 1px solid var(--primary);
    border-radius: var(--radius-xl);
}

/* Cards Grid */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.card {
    background: var(--bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--text);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

.card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text);
}

.card p {
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
    flex: 1;
    line-height: 1.7;
}

.card-link {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: all var(--transition-normal);
    width: fit-content;
}

.card-link:hover {
    color: var(--primary-dark);
    transform: translateX(4px);
}

/* Card Type Variants */
.blog-card {
    border-top: 3px solid #3b82f6;
}

.blog-card:hover {
    border-top-color: #1d4ed8;
}

.books-card {
    border-top: 3px solid #8b5cf6;
}

.books-card:hover {
    border-top-color: #6d28d9;
}

.about-card {
    border-top: 3px solid #ec4899;
}

.about-card:hover {
    border-top-color: #be185d;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--text-light);
    font-size: 0.95rem;
    border-top: 1px solid var(--border);
    margin-top: var(--spacing-3xl);
}

.footer a {
    color: var(--text-light);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.footer a:hover {
    color: var(--primary);
}

/* Social Links in Footer */
.footer-social {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    /* margin-top: 1.5rem; */
    padding-top: 1rem;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-light);
    color: var(--text-light);
    text-decoration: none;
    font-size: 1.25rem;
    transition: all var(--transition-normal);
}

.social-link:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

.social-link:hover svg {
    fill: white;
}

/* Main Navigation Bar */
.main-nav {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    width: 100%;
    margin: 0;
    padding: 0;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    height: 4rem;
    position: relative;
}

.hamburger-menu {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    gap: 0.35rem;
    z-index: 101;
}

.hamburger-menu span {
    width: 1.5rem;
    height: 0.2rem;
    background-color: var(--text);
    transition: all var(--transition-normal);
    border-radius: 0.1rem;
}

.hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(0.5rem, 0.7rem);
}

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

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(0.4rem, -0.6rem);
}

.nav-links {
    display: flex;
    gap: 0;
    margin: 0;
    padding: 0;
    list-style: none;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-links li {
    margin: 0;
}

.nav-link {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text);
    text-decoration: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
    border: none;
}

.nav-link:hover {
    color: var(--primary);
    background-color: rgba(99, 102, 241, 0.1);
}

.nav-link.active {
    color: var(--primary);
    font-weight: 600;
    background-color: rgba(99, 102, 241, 0.15);
}

@media (max-width: 768px) {
    .hamburger-menu {
        display: flex;
    }

    .nav-links {
        position: fixed;
        left: 0;
        top: 4rem;
        width: 100%;
        flex-direction: column;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-normal);
        transform: none;
        z-index: 100;
    }

    .nav-links.active {
        max-height: 500px;
    }

    .nav-link {
        padding: 1rem;
        text-align: center;
        border-bottom: 1px solid var(--border);
        white-space: normal;
    }

    .nav-link:last-child {
        border-bottom: none;
    }
}

@media (max-width: 1074px) and (min-width: 919px) {
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.95rem;
    }
}

@media (max-width: 918px) and (min-width: 769px) {
    .nav-link {
        padding: var(--spacing-xs) var(--spacing-xs);
        font-size: 0.9rem;
    }
}

/* Theme Switcher in Header */
#themeSwitcher {
    display: flex;
    gap: 0.25rem;
    align-items: center;
    margin: 0;
    padding: 0 1rem;
    flex-shrink: 0;
}

.theme-button {
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    border-radius: 0;
    transition: all var(--transition-fast);
    appearance: none;
    -webkit-appearance: none;
}

.theme-button:hover {
    background-color: rgba(99, 102, 241, 0.1);
}

.theme-button.active {
    background-color: rgba(99, 102, 241, 0.15);
    color: var(--primary);
}

/* Old theme switcher styles for pages without header nav */
.page-theme-switcher {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 50;
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.page-theme-switcher .theme-button {
    padding: var(--spacing-sm);
    background: var(--bg);
    border: 1px solid var(--border);
    cursor: pointer;
    font-size: 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.page-theme-switcher .theme-button:hover {
    background: var(--border);
}

.page-theme-switcher .theme-button.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Fallback for old pages */
.legacy-theme-switcher {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 50;
    display: flex;
    gap: 0.5rem;
}

/* Breadcrumb Navigation */
.breadcrumb {
    margin-bottom: 2rem;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.breadcrumb a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.breadcrumb span {
    color: var(--text-light);
    margin: 0 0.25rem;
}

.breadcrumb-separator::before {
    content: "/";
    color: var(--text-light);
    margin: 0 0.5rem;
}

/* Blog/Section Intro */
.blog-intro {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.blog-intro h1 {
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    color: var(--text);
}

.blog-intro p {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* Category Cards */
.blog-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.blog-category {
    display: block;
    background: var(--bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-decoration: none;
    color: var(--text);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.blog-category:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

.category-description {
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.category-cta {
    display: inline-flex;
    align-items: center;
    color: var(--primary);
    font-weight: 600;
    transition: all var(--transition-normal);
}

.blog-category:hover .category-cta {
    color: var(--primary-dark);
    transform: translateX(4px);
}

/* Info/Note Boxes */
.recent-note {
    background: linear-gradient(135deg, var(--warning-light) 0%, #fde68a 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
    border-left: 4px solid var(--warning);
}

.recent-note strong {
    color: var(--warning-dark);
}

.recent-note p {
    color: #78350f;
    font-size: 0.95rem;
    margin: 0;
}

html.dark-theme .recent-note {
    background: linear-gradient(135deg, #92400e 0%, #b45309 100%);
    border-left-color: #fcd34d;
}

html.dark-theme .recent-note strong {
    color: #fef3c7;
}

html.dark-theme .recent-note p {
    color: #fef3c7;
}

/* Interest Items (About Page) */
.interest-item {
    background: var(--bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.interest-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.interest-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

.interest-description {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Coming Soon Box (Books Page) */
.what-to-expect {
    background: var(--bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    max-width: 600px;
    margin: var(--spacing-xl) auto;
    text-align: left;
}

.what-to-expect h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text);
    text-align: center;
}

.expect-list {
    list-style: none;
}

.expect-list li {
    padding: var(--spacing-sm) 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.6;
}

.expect-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
    font-size: 1.2rem;
}

/* Responsive Design */
@media (max-width: 640px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 3rem 0 2rem;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1.1rem;
    }

    .intro {
        font-size: 1rem;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 1rem;
    }

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

    .cards {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .featured h2 {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .blog-intro h1 {
        font-size: 1.75rem;
    }

    .blog-intro p {
        font-size: 1rem;
    }

    .blog-categories {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .category-icon {
        font-size: 2.5rem;
    }

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

/* Blog Index Page Styles */
.latest-section {
    margin-bottom: var(--spacing-3xl);
}

.latest-title,
.topics-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--text);
}

.blog-posts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.blog-post-item {
    background: var(--bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    text-decoration: none;
    color: var(--text);
    display: block;
}

.blog-post-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

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

.post-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}

.post-date {
    font-size: 0.9rem;
    color: var(--text-light);
    white-space: nowrap;
    flex-shrink: 0;
}

.post-snippet {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

.divider-line {
    height: 2px;
    background: linear-gradient(90deg, var(--primary) 0%, transparent 100%);
    margin: var(--spacing-3xl) 0;
    opacity: 0.5;
}

.topics-section {
    margin-top: var(--spacing-3xl);
}

@media (max-width: 768px) {
    .post-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .post-date {
        white-space: normal;
    }

    .blog-post-item {
        padding: var(--spacing-lg);
    }

    .post-title {
        font-size: 1.1rem;
    }
}