:root {
    --primary-color: #4a6fa5;
    --secondary-color: #6b8cbb;
    --accent-color: #e3f2fd;
    --text-color: #333;
    --light-gray: #f5f7fa;
    --dark-gray: #5a5a5a;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.12);
    --transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.animate-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--transition), transform 0.8s var(--transition);
}

.animate-section.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-step {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s var(--transition), transform 0.6s var(--transition);
}

.animate-step.visible {
    opacity: 1;
    transform: translateX(0);
}

.animate-card {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--transition), transform 0.6s var(--transition);
}

.animate-card.visible {
    opacity: 1;
    transform: translateY(0);
}

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

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

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

header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 0;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.site-title {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.site-description {
    font-size: 1.2rem;
    font-weight: 400;
    max-width: 800px;
}

main {
    padding: 3rem 0;
}

.intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    padding: 0 20px;
}

.intro h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.intro p {
    color: var(--dark-gray);
    font-size: 1.1rem;
}

.worksheets h2, .how-to-use h2 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.8rem;
}

.how-to-use {
    margin: 4rem 0;
}

.steps {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1.5rem;
    margin-top: 2rem;
}

.step {
    flex: 1;
    min-width: 200px;
    display: flex;
    align-items: flex-start;
    background-color: var(--light-gray);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.step::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: var(--transition);
}

.step:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-hover);
}

.step:hover::before {
    opacity: 1;
}

.step-number {
    background-color: var(--primary-color);
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    margin-right: 1rem;
    flex-shrink: 0;
}

.step-content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.step-content p {
    color: var(--dark-gray);
    font-size: 1rem;
}

.worksheets {
    margin-top: 4rem;
}

.worksheet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.worksheet-card {
    background-color: var(--light-gray);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.worksheet-card {
    position: relative;
    overflow: hidden;
}

.worksheet-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: var(--transition);
    z-index: 1;
}

.worksheet-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-hover);
}

.worksheet-card:hover::before {
    opacity: 1;
}

.card-header {
    background-color: var(--secondary-color);
    color: white;
    padding: 1.5rem;
    text-align: center;
}

.card-header h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.card-body {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-body p {
    margin-bottom: 1.5rem;
    color: var(--dark-gray);
    flex-grow: 1;
}

.worksheet-preview {
    width: 100%;
    height: 180px;
    background-color: #e9ecef;
    margin-bottom: 1.5rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.worksheet-preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.download-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
    align-self: flex-start;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150%;
    height: 150%;
    background: var(--secondary-color);
    transform: translate(-50%, -50%) scale(0);
    transition: transform 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
    border-radius: 50%;
    z-index: -1;
}

.download-btn:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-hover);
}

.download-btn:hover::before {
    transform: translate(-50%, -50%) scale(1);
}

.download-btn:active {
    transform: scale(0.98);
}

.download-count {
    font-size: 0.9rem;
    opacity: 0.8;
    transition: var(--transition);
    color: var(--dark-gray);
    margin-top: 0.5rem;
}

footer {
    background-color: var(--light-gray);
    padding: 2rem 0;
    text-align: center;
    margin-top: 3rem;
    color: var(--dark-gray);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 10px;
    transition: var(--transition);
    position: relative;
    padding: 2px 0;
}


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


footer .footer-content p:last-child {
    margin-top: 1.5rem;
}

@media (max-width: 768px) {
    .site-title {
        font-size: 2rem;
    }
    
    .site-description {
        font-size: 1rem;
    }
    
    .intro h2, .worksheets h2, .how-to-use h2 {
        font-size: 1.5rem;
    }
    
    .intro p {
        font-size: 1rem;
    }
    
    .worksheet-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        flex-direction: column;
    }
    
    .step {
        width: 100%;
    }
}

.policy-content, .terms-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.policy-content h2, .terms-content h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    text-align: center;
}

.policy-content h3, .terms-content h3 {
    color: var(--secondary-color);
    margin: 2rem 0 1rem;
    font-size: 1.4rem;
}

.policy-content p, .terms-content p {
    color: var(--dark-gray);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.policy-content ul, .terms-content ul {
    list-style-type: none;
    padding: 0;
    margin: 1rem 0;
}

.policy-content li, .terms-content li {
    color: var(--dark-gray);
    margin: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.policy-content li:before, .terms-content li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

.policy-content a, .terms-content a, .container > p > a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.container > p > a {
    display: block;
    text-align: center;
    margin: 2rem 0;
}

.policy-content a:hover, .terms-content a:hover, .container > p > a:hover {
    color: var(--secondary-color);
}

.last-updated {
    color: var(--dark-gray);
    font-style: italic;
    text-align: center;
    margin-bottom: 2rem;
}

@media (max-width: 480px) {
    .site-title {
        font-size: 1.8rem;
    }
    
    .card-header h3 {
        font-size: 1.3rem;
    }
    
    .download-btn {
        width: 100%;
    }
}