:root {
    --primary-color: #2563eb;
    --secondary-color: #475569;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 3rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
}

.header h1 {
    font-weight: 700;
    font-size: 2.5rem;
    color: var(--text-main);
    margin: 0 0 0.5rem 0;
    letter-spacing: -1px;
}

.header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin: 0;
}

.container {
    max-width: 900px;
    width: 100%;
    display: grid;
    gap: 2.5rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #e2e8f0;
    color: var(--text-main);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem 1.5rem;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border: 1px solid #f1f5f9;
}

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

.file-name {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.stats {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    background: #f1f5f9;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
}

.download-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.875rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    text-decoration: none;
    transition: background-color 0.2s ease, transform 0.1s ease;
    box-sizing: border-box;
    margin-bottom: 0.5rem;
}

.download-btn:hover {
    background-color: #1d4ed8;
}

.download-btn.zip-btn {
    background-color: var(--secondary-color);
    margin-bottom: 0;
}

.download-btn.zip-btn:hover {
    background-color: #334155;
}

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

.ad-banner {
    background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    border: 1px solid #7dd3fc;
    border-radius: 12px;
    padding: 2.5rem 2rem;
    margin-top: 1rem;
    text-align: center;
    color: var(--text-main);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05);
}

.ad-banner h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 0 0 0.75rem 0;
    letter-spacing: -0.5px;
    color: #0369a1;
}

.ad-banner p {
    font-size: 1.05rem;
    color: #334155;
    margin: 0 auto 1.5rem auto;
    line-height: 1.6;
    max-width: 700px;
}

.ad-btn1 {
    background-color: #0284c7;
    color: white;
    text-decoration: none;
    padding: 0.875rem 2.5rem;
    border-radius: 8px;
    font-weight: 600;
    display: inline-block;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.ad-btn1:hover {
    background-color: #0369a1;
}