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

body {
    font-family: 'Inter', 'Noto Sans Bengali', sans-serif;
    line-height: 1.7;
    color: #1a1a1a;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8f5e9 100%);
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    padding: 40px;
}

header {
    text-align: center;
    border-bottom: 3px solid #2e7d32;
    padding-bottom: 30px;
    margin-bottom: 40px;
}

header h1 {
    font-family: 'Noto Sans Bengali', sans-serif;
    font-size: 2.5rem;
    color: #1b5e20;
    margin-bottom: 10px;
}

header h2 {
    font-size: 1.5rem;
    color: #2e7d32;
    font-weight: 600;
    margin-bottom: 15px;
}

.tagline {
    font-size: 1.1rem;
    color: #555;
    margin-bottom: 15px;
}

.thanks {
    font-size: 1.1rem;
    color: #1b5e20;
    background: #e8f5e9;
    padding: 12px 20px;
    border-radius: 8px;
    display: inline-block;
}

section {
    margin-bottom: 45px;
}

h3 {
    font-size: 1.8rem;
    color: #1b5e20;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #c8e6c9;
}

h4 {
    font-size: 1.3rem;
    color: #2e7d32;
    margin: 25px 0 15px 0;
}

h5 {
    font-size: 1.1rem;
    color: #388e3c;
    margin: 20px 0 10px 0;
}

p {
    margin-bottom: 15px;
}

a {
    color: #1976d2;
    text-decoration: none;
    font-weight: 600;
}

a:hover {
    text-decoration: underline;
    color: #0d47a1;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.card {
    background: #f1f8f4;
    border: 2px solid #c8e6c9;
    border-radius: 12px;
    padding: 25px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(46,125,50,0.15);
}

.card h4 {
    margin-top: 0;
    color: #1b5e20;
}

.card.meta {
    display: block;
    margin-top: 12px;
    font-size: 0.9rem;
    color: #666;
    font-weight: 600;
}

.option {
    background: #fafafa;
    border-left: 4px solid #4caf50;
    padding: 25px;
    margin: 25px 0;
    border-radius: 8px;
}

ul, ol {
    margin-left: 25px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 8px;
}

.checklist li {
    list-style: none;
    position: relative;
    padding-left: 30px;
}

.checklist li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4caf50;
    font-weight: bold;
    font-size: 1.2rem;
}

pre {
    background: #263238;
    color: #aed581;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 15px 0;
    font-size: 0.95rem;
    line-height: 1.6;
}

code {
    font-family: 'Courier New', monospace;
    background: #e8f5e9;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

pre code {
    background: none;
    padding: 0;
    color: #aed581;
}

footer {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 3px solid #2e7d32;
    text-align: center;
}

.footer-note {
    margin-top: 20px;
    font-style: italic;
    color: #555;
}

.bpy {
    font-family: 'Noto Sans Bengali', sans-serif;
    font-size: 1.2rem;
    color: #1b5e20;
    margin-top: 10px;
    font-weight: 600;
}

@media (max-width: 768px) {
   .container {
        padding: 25px;
    }

    header h1 {
        font-size: 2rem;
    }

    header h2 {
        font-size: 1.2rem;
    }

    h3 {
        font-size: 1.5rem;
    }
}