:root {
    --primary-color: #e67e22;
    --primary-dark: #d35400;
    --primary-light: #f39c12;
    --accent-color: #ff9f43;
    --text-dark: #2c3e50;
    --text-light: #34495e;
    --background-light: #fef9f3;
    --background-white: #ffffff;
    --border-color: #e8e8e8;
    --shadow-color: rgba(230, 126, 34, 0.1);
    --gradient-primary: linear-gradient(135deg, #e67e22, #d35400);
    --gradient-light: linear-gradient(135deg, #fef9f3, #ffffff);
    --text-muted: #6c757d;
    --surface-light: #ffffff;
    --surface-dark: #1e1e1e;
    --border-radius: 12px;
    --box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
    background-color: var(--background-light);
    color: var(--text-dark);
    line-height: 1.7;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 1.2rem 0;
    transition: all 0.3s ease;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-dark);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.navigation ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.navigation a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.navigation a:hover,
.navigation a.active {
    color: var(--primary-color);
}

.navigation a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

.navigation a:hover::after,
.navigation a.active::after {
    width: 100%;
}

.mobile-menu-button {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-dark);
}

.hero {
    background: var(--gradient-primary);
    color: white;
    padding: 8rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="20" cy="80" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="80" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.back-button:hover {
    color: white;
    transform: translateX(-3px);
}

.parent-topic {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.3rem;
    opacity: 0.95;
    max-width: 600px;
    line-height: 1.6;
}

.main-content {
    padding: 4rem 0;
}

.two-column-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    align-items: start;
}

.sidebar {
    position: sticky;
    top: 120px;
    background: var(--background-white);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 8px 25px var(--shadow-color);
    border: 1px solid var(--border-color);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--primary-color);
}

.sidebar-header i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.sidebar-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-dark);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    transition: all 0.3s ease;
}

.sidebar-nav-item:hover,
.sidebar-nav-item.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    transform: translateX(5px);
}

.sidebar-nav-item i {
    font-size: 1.1rem;
    width: 20px;
}

.main-column {
    background: var(--background-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 25px var(--shadow-color);
    border: 1px solid var(--border-color);
}

.content-section {
    padding: 3rem;
    border-bottom: 1px solid var(--border-color);
}

.content-section:last-child {
    border-bottom: none;
}

.content-section h2 {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 2rem;
}

.content-section h2 i {
    color: var(--primary-color);
}

.content-section h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 2rem 0 1rem;
}

.content-section h4 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-light);
    margin: 1.5rem 0 0.8rem;
}

.content-section p {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.content-section ul,
.content-section ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.content-section li {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 0.8rem;
    color: var(--text-light);
}

.content-section li strong {
    color: var(--text-dark);
    font-weight: 600;
}

.verse-quote {
    background: var(--gradient-light);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    border-radius: 0 12px 12px 0;
    font-style: italic;
    color: var(--text-dark);
    box-shadow: 0 4px 15px var(--shadow-color);
}

.verse-quote strong {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-dark);
    font-style: normal;
}

.analysis-box {
    background: linear-gradient(135deg, rgba(230, 126, 34, 0.08), rgba(211, 84, 0, 0.08));
    border: 1px solid rgba(230, 126, 34, 0.2);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
}

.analysis-box h4 {
    color: var(--primary-dark);
    font-weight: 600;
    margin: 0 0 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.analysis-box h4::before {
    content: '💡';
    font-size: 1.2rem;
}

.analysis-box p {
    margin: 0;
    color: var(--text-dark);
    font-weight: 500;
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.active {
    opacity: 1;
    transform: translateY(0);
}

footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.footer-info {
    max-width: 400px;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-description {
    opacity: 0.8;
    line-height: 1.6;
}

.copyright {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    opacity: 0.6;
}

.to-top-button {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 4px 15px var(--shadow-color);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 100;
}

.to-top-button.visible {
    opacity: 1;
    visibility: visible;
}

.to-top-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px var(--shadow-color);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .two-column-layout {
        grid-template-columns: 250px 1fr;
        gap: 2rem;
    }
    
    .sidebar {
        padding: 1.5rem;
    }
    
    .content-section {
        padding: 2.5rem;
    }
}

@media (max-width: 768px) {
    .two-column-layout {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .sidebar {
        position: static;
        order: 2;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .content-section {
        padding: 2rem;
    }
    
    .content-section h2 {
        font-size: 1.8rem;
    }
    
    .verse-quote {
        padding: 1rem 1.5rem;
    }
    
    .analysis-box {
        padding: 1.5rem;
    }
}

@media (max-width: 576px) {
    .mobile-menu-button {
        display: block;
    }
    
    .navigation {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        z-index: 999;
        display: none;
    }
    
    .navigation.active {
        display: block;
    }
    
    .navigation ul {
        flex-direction: column;
        gap: 0;
        padding: 0;
    }
    
    .navigation ul li {
        width: 100%;
    }
    
    .navigation ul li a {
        display: block;
        padding: 15px 20px;
        border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    
    .navigation ul li a::after {
        display: none;
    }
    
    .hero {
        padding: 6rem 0 3rem;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .content-section {
        padding: 1.5rem;
    }
    
    .content-section h2 {
        font-size: 1.6rem;
    }
    
    .sidebar {
        padding: 1.5rem;
    }
}