:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --success-color: #27ae60;
    --error-color: #e74c3c;
    --bg-color: #f5f6fa;
    --text-color: #333;
    --border-radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background-color: #ffffff;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    width: 100%;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: var(--primary-color);
    font-size: 24px;
    margin-bottom: 10px;
}

header p {
    font-size: 14px;
    color: #666;
    line-height: 1.5;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

input[type="url"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: border-color 0.3s ease;
}

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

button, .btn {
    display: block;
    width: 100%;
    padding: 14px;
    background-color: var(--accent-color);
    color: #ffffff;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

button:hover, .btn:hover {
    background-color: #2980b9;
}

button:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: #ecf0f1;
    color: var(--primary-color);
    margin-top: 10px;
}

.btn-secondary:hover {
    background-color: #bdc3c7;
}

.loader-container {
    display: none;
    text-align: center;
    margin-top: 30px;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-left-color: var(--accent-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px auto;
}

.loader-container p {
    font-weight: bold;
    color: var(--primary-color);
}

.small-text {
    font-size: 12px;
    color: #7f8c8d;
    font-weight: normal !important;
    margin-top: 5px;
}

.result-container {
    text-align: center;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid #eee;
}

.success-icon {
    background-color: var(--success-color);
    color: white;
    width: 50px;
    height: 50px;
    line-height: 50px;
    border-radius: 50%;
    font-size: 24px;
    margin: 0 auto 15px auto;
}

.result-container h2 {
    color: var(--primary-color);
    font-size: 20px;
    margin-bottom: 10px;
}

.result-container p {
    font-size: 18px;
    font-weight: bold;
    color: var(--success-color);
    margin-bottom: 20px;
}

.error-container {
    margin-top: 20px;
    padding: 15px;
    background-color: #fadbd8;
    color: var(--error-color);
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: bold;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}