* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

:root {
    --bg-color: #f5f5f5;
    --card-bg: white;
    --text-color: #333;
    --border-color: #ddd;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --focus-color: #6b9cd6;
    --focus-shadow: rgba(107, 156, 214, 0.2);
    --error-color: #d63c3c;
    --success-color: #2e7d32;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --card-bg: #2d2d2d;
        --text-color: #e0e0e0;
        --border-color: #444;
        --shadow-color: rgba(0, 0, 0, 0.3);
        --focus-color: #78a9e6;
        --focus-shadow: rgba(120, 169, 230, 0.3);
        --error-color: #ff6b6b;
        --success-color: #4caf50;
    }
}

body {
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    transition: background-color 0.3s ease;
}

.container {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--shadow-color);
    width: 90%;
    max-width: 500px;
    text-align: center;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

h1 {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    transition: color 0.3s ease;
}

.input-wrapper {
    margin-bottom: 1.5rem;
}

input {
    width: 100%;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease, color 0.3s ease;
    background-color: var(--card-bg);
    color: var(--text-color);
}

input:focus {
    border-color: var(--focus-color);
    box-shadow: 0 0 0 2px var(--focus-shadow);
}

#result {
    padding: 1rem;
    border-radius: 4px;
    text-align: left;
}

#result.hidden {
    display: none;
}

#result.error #result-text {
    color: var(--error-color);
}

#result.success #result-text {
    color: var(--success-color);
}

#result-text {
    font-size: 1.1rem;
    line-height: 1.5;
    color: var(--text-color);
    transition: color 0.3s ease;
}

::placeholder {
    color: var(--text-color);
    opacity: 0.6;
}