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

:root {
    --black: #000000;
    --white: #ffffff;
    --yellow: #ffd700;
    --blue: #1a73e8;
    --gray: #f0f0f0;
    --border-thick: 4px;
    --shadow-heavy: 8px 8px 0 var(--black);
    --radius-large: 24px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--white);
    color: var(--black);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow-x: hidden;
}

/* Grid Background */
.grid-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--black) 1px, transparent 1px),
        linear-gradient(90deg, var(--black) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.06;
    z-index: 0;
    pointer-events: none;
}

.container {
    position: relative;
    z-index: 1;
    max-width: 720px;
    width: 100%;
    padding: 24px;
}

/* Hero */
.hero {
    background: var(--white);
    border: var(--border-thick) solid var(--black);
    border-radius: var(--radius-large);
    padding: 48px 40px;
    box-shadow: var(--shadow-heavy);
    text-align: center;
}

.badge {
    display: inline-block;
    background: var(--black);
    color: var(--yellow);
    padding: 4px 16px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
    border: 2px solid var(--black);
}

h1 {
    font-size: 48px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 4px;
    background: linear-gradient(135deg, var(--black) 40%, var(--blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 20px;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 12px;
}

.description {
    font-size: 16px;
    line-height: 1.7;
    color: #333;
    max-width: 480px;
    margin: 0 auto 32px;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 32px;
}

.feature {
    background: var(--gray);
    border: 3px solid var(--black);
    border-radius: 16px;
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.feature:hover {
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--black);
}

.feature-icon {
    font-size: 18px;
}

/* Actions */
.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 700;
    border: 3px solid var(--black);
    border-radius: 16px;
    text-decoration: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    cursor: pointer;
}

.btn:hover {
    transform: translate(-3px, -3px);
    box-shadow: 6px 6px 0 var(--black);
}

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

.btn-primary .arrow {
    color: var(--yellow);
}

.btn-secondary {
    background: var(--white);
    color: var(--black);
}

.btn-secondary .arrow {
    color: var(--blue);
}

.arrow {
    font-size: 20px;
    transition: transform 0.2s ease;
}

.btn:hover .arrow {
    transform: translateX(4px);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: #666;
}

footer a {
    color: var(--black);
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 600px) {
    .hero {
        padding: 32px 20px;
        box-shadow: 6px 6px 0 var(--black);
    }
    
    h1 {
        font-size: 32px;
    }
    
    .subtitle {
        font-size: 17px;
    }
    
    .description {
        font-size: 15px;
    }
    
    .features {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    
    .feature {
        font-size: 13px;
        padding: 10px 12px;
    }
    
    .actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        justify-content: center;
        padding: 12px 24px;
    }
}

@media (max-width: 400px) {
    .hero {
        padding: 24px 16px;
        border-width: 3px;
        border-radius: 16px;
        box-shadow: 4px 4px 0 var(--black);
    }
    
    h1 {
        font-size: 26px;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
}