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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #0b0f1a;
    color: #e5e7eb;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: #111827;
    padding: 32px;
    border-radius: 16px;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
    border: 1px solid #1f2937;
    width: 100%;
    max-width: 500px;
    text-align: center;
}

h1 {
    color: #e5e7eb;
    margin-bottom: 20px;
    font-size: 2rem;
    font-weight: 600;
}

.form-group {
    margin-bottom: 25px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #9ca3af;
    font-weight: 500;
}

input[type="url"] {
    width: 100%;
    padding: 14px;
    background: #0f172a;
    color: #e5e7eb;
    border: 1px solid #374151;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

input[type="url"]:focus {
    outline: none;
    border-color: #3b82f6;
    background: #111827;
}

.btn {
    background: #3b82f6;
    color: white;
    padding: 14px 24px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, opacity 0.2s ease;
    width: 100%;
}

.btn:hover {
    background: #2563eb;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.result {
    margin-top: 24px;
    padding: 0;
    background: transparent;
    border-radius: 10px;
    display: none;
}

.result.show {
    display: block;
}

.result h3 {
    color: #e5e7eb;
    margin-bottom: 12px;
    font-weight: 500;
}

.url-result {
    background: #0f172a;
    padding: 14px;
    border-radius: 8px;
    border: 1px solid #1f2937;
    margin-bottom: 12px;
    word-break: break-all;
}

.url-result strong {
    color: #93c5fd;
}

.copy-btn {
    background: #374151;
    color: #e5e7eb;
    border: none;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s ease, opacity 0.2s ease;
}

.copy-btn:hover {
    background: #4b5563;
}

.copy-btn.copied {
    background: #059669;
    color: #ecfdf5;
}

.error {
    background: #2f1517;
    color: #fca5a5;
    padding: 14px;
    border: 1px solid #7f1d1d;
    border-radius: 8px;
    margin-top: 20px;
    display: none;
}

.error.show {
    display: block;
}

.loading {
    display: none;
    margin-top: 20px;
}

.spinner {
    border: 4px solid #1f2937;
    border-top: 4px solid #3b82f6;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
}