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

:root {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #ffffff;
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --error-bg: #4a1f1f;
    --error-color: #ff6b6b;
    --input-bg: #3d3d3d;
    --input-border: #4d4d4d;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 90%;
    max-width: 600px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: var(--container-bg);
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-color);
    font-size: 2rem;
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-direction: column;
}

input[type="url"] {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: border-color 0.3s;
}

input[type="url"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

button {
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s, transform 0.2s;
    width: 100%;
}

button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.error {
    color: var(--error-color);
    margin: 1rem 0;
    padding: 1rem;
    background-color: var(--error-bg);
    border-radius: 8px;
    text-align: center;
}

.result {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--input-bg);
    border-radius: 8px;
}

.result h2 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.short-url {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.short-url a {
    color: var(--primary-color);
    text-decoration: none;
    word-break: break-all;
    font-size: 1.1rem;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.short-url a:hover {
    background-color: var(--input-bg);
}

@media (max-width: 600px) {
    .container {
        margin: 1rem;
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    button {
        padding: 0.8rem 1.5rem;
    }
}