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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.5;
    color: var(--neutral-800);
    background-color: var(--neutral-50);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    opacity: 1 !important; /* Ensure headings are always visible */
    transform: none !important; /* Prevent transform from hiding headings */
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 1.75rem);
}

h4 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
    margin-bottom: var(--space-md);
}

a {
    color: var(--primary-600);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-800);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--border-radius-full);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    border: none;
    outline: none;
    box-shadow: var(--shadow-md);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

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

.btn-secondary {
    background: var(--neutral-100);
    color: var(--neutral-800);
    border: 1px solid var(--neutral-300);
}

.btn-secondary:hover {
    background: var(--neutral-200);
    box-shadow: var(--shadow-lg);
}

/* Section styling */
section {
    padding: var(--space-3xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-md);
    color: var(--neutral-800);
}

.section-subtitle {
    display: block;
    opacity: 1;
    color: var(--neutral-600);
    font-size: 1.25rem;
    margin-bottom: var(--space-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.section-subtitle, .book-card {
    position: relative !important;
    z-index: 9999 !important;
    opacity: 1 !important;
    display: block !important;
}

/* Utility classes */
.hidden {
    display: none !important;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    margin: var(--space-xl) auto;
    border: 4px solid var(--neutral-200);
    border-top: 4px solid var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive container */
@media (max-width: 1200px) {
    .container {
        padding: 0 var(--space-lg);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    section {
        padding: var(--space-2xl) 0;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .btn {
        padding: var(--space-sm) var(--space-lg);
        font-size: 0.9rem;
    }
}