body {
    background-color: #0b0e14;
    color: #e6edf3;
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
}

header {
    background: #161b22;
    padding: 1rem 5%;
    border-bottom: 2px solid #238636;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { font-weight: bold; font-size: 1.5rem; }
.logo span { color: #238636; }

main { padding: 2rem 5%; }

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

.tools {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.card {
    background: #161b22;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #30363d;
}

input, textarea, button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
    border: 1px solid #30363d;
    background: #0d1117;
    color: white;
}

button {
    background-color: #238636;
    cursor: pointer;
    font-weight: bold;
}

#strengthMeter {
    padding: 10px;
    font-weight: bold;
    text-align: center;
}

.success { color: #2ea043; margin-top: 10px; }