:root {
    --primary-bg: #ffffff;
    --secondary-bg: #f8f9fa;
    --accent-color: #2563eb;
    /* Royal Blue */
    --accent-hover: #1d4ed8;
    --text-primary: #1e293b;
    /* Slate 900 */
    --text-secondary: #475569;
    /* Slate 600 */
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    /* Slate 200 */
    --font-heading: 'Amiri', serif;
    --font-body: 'Inter', sans-serif;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 8px;
}

body.dark-mode {
    --primary-bg: #0f172a;
    --secondary-bg: #1e293b;
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --card-bg: #1e293b;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
}

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

body {
    font-family: var(--font-body);
    background-color: var(--secondary-bg);
    color: var(--text-primary);
    line-height: 1.7;
    direction: rtl;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
    background-color: var(--secondary-bg);
    color: var(--accent-color);
    border-color: var(--accent-color);
}

/* Header */
header {
    background: var(--primary-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 1rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.religious-text-main {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--text-primary);
    font-weight: 700;
    display: block;
    margin-bottom: 0.5rem;
}

.religious-text-sub {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--text-secondary);
    display: block;
}

/* Navigation */
nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 1.5rem 0;
    background: var(--primary-bg);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.nav-btn {
    background: transparent;
    border: none;
    padding: 0.5rem 1rem;
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s ease;
    font-size: 1rem;
    border-radius: var(--radius);
}

.nav-btn:hover {
    color: var(--accent-color);
    background-color: var(--secondary-bg);
}

.nav-btn.active {
    color: var(--accent-color);
    background-color: #eff6ff;
    /* Light blue bg */
}

/* Main Layout */
main {
    max-width: 900px;
    /* Reduced width for reading focus */
    margin: 3rem auto;
    padding: 0 1.5rem;
}

/* Posts Grid */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

/* Card Styling */
.concept-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
}

.concept-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
}

.concept-icon {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.concept-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.concept-description {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.read-more-btn {
    display: inline-block;
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: none;
    font-size: 0.95rem;
    align-self: flex-start;
}

.read-more-btn:hover {
    text-decoration: underline;
    color: var(--accent-hover);
}

/* Post Detail */
.post-container {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.back-btn:hover {
    color: var(--accent-color);
}

.post-header {
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.post-header h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.post-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.post-content {
    font-size: 1.125rem;
    /* 18px */
    line-height: 1.8;
}

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content ul,
.post-content ol {
    margin-bottom: 1.5rem;
    padding-right: 2rem;
}

.post-content li {
    margin-bottom: 0.5rem;
}

/* Info Box / Units Box */
.info-box {
    background-color: var(--secondary-bg);
    /* changed from hardcoded #f1f5f9 */
    border-right: 4px solid var(--accent-color);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 4px;
    font-size: 1rem;
    color: var(--text-primary);
    /* Ensure text is visible */
}

.math-formula {
    font-family: 'Fira Code', monospace;
    background: var(--secondary-bg);
    /* changed from #f8fafc */
    border: 1px solid var(--border-color);
    padding: 1rem;
    color: var(--text-secondary);
}

.speed-control input {
    width: 100%;
    accent-color: var(--accent-color);
}

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

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

.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

/* Responsive */
@media (max-width: 768px) {
    main {
        padding: 0 1rem;
        margin: 2rem auto;
    }

    .post-container {
        padding: 1.5rem;
    }

    .religious-text-main {
        font-size: 1.5rem;
    }

    .post-header h1 {
        font-size: 2rem;
    }
}

/* Auto Scroll Widget */
.scroll-widget {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--card-bg);
    border: 2px solid var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    /* Pill shape */
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    z-index: 9999;
    display: flex;
    flex-direction: row;
    /* Always horizontal */
    gap: 1rem;
    width: auto;
    /* Auto width */
    align-items: center;
}

.scroll-controls {
    display: flex;
    align-items: center;
}

.speed-control {
    display: flex;
    /* Always visible */
    align-items: center;
    gap: 0.5rem;
}

.main-btn {
    width: 45px;
    height: 45px;
    font-size: 1.1rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
}

.main-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.small-btn {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.small-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

#speed-display {
    font-weight: bold;
    color: var(--accent-color);
    font-family: var(--font-heading);
    min-width: 20px;
    text-align: center;
    font-size: 1.1rem;
}

.widget-icon {
    display: none;
    /* No icon needed in expanded mode */
}