:root {
    --bg: #f6f8fa;
    --primary: #0069ff;
    --text: #111827;
    --card: #ffffff;
    --radius: 12px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

* {
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    margin: 0;
    background: var(--bg);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px;
    min-height: 100vh;
    color: var(--text);
}

.card {
    background: var(--card);
    padding: 32px 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 480px;
}

h1 {
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 24px;
    text-align: center;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
}

select,
input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #d1d5db;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 1rem;
}

button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: #0053d6;
}

.output {
    margin-top: 20px;
    word-break: break-all;
    background: #f3f4f6;
    padding: 12px;
    border-radius: var(--radius);
    font-family: monospace;
    font-size: 0.9rem;
}

.hidden {
    display: none;
}