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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    padding: 2rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    opacity: 0.9;
    font-size: 1.1rem;
}

main {
    padding: 2rem;
}

.input-section {
    display: flex;
    gap: 10px;
    margin-bottom: 2rem;
}

#urlInput {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

#urlInput:focus {
    outline: none;
    border-color: #4f46e5;
}

button {
    padding: 12px 24px;
    background: #4f46e5;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: #4338ca;
}

button:disabled {
    background: #9ca3af;
    cursor: not-allowed;
}

.secondary-btn {
    background: #6b7280;
}

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

.hidden {
    display: none !important;
}

#loading {
    text-align: center;
    padding: 2rem;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #4f46e5;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.result-item {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 8px;
}

.result-item label {
    font-weight: 600;
    color: #4b5563;
    display: block;
    margin-bottom: 0.5rem;
}

.url-display {
    background: white;
    padding: 12px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    word-break: break-all;
    font-family: monospace;
    font-size: 14px;
}

#securityInfo {
    margin: 2rem 0;
    padding: 1.5rem;
    background: #f0f9ff;
    border-radius: 8px;
    border-left: 4px solid #0ea5e9;
}

.warning {
    color: #dc2626;
    background: #fef2f2;
    padding: 0.5rem;
    border-radius: 4px;
    margin: 0.5rem 0;
}

.safe-indicator {
    color: #059669;
    background: #f0fdf4;
    padding: 0.5rem;
    border-radius: 4px;
    margin: 0.5rem 0;
}

.risk-high { border-left-color: #dc2626; background: #fef2f2; }
.risk-medium { border-left-color: #f59e0b; background: #fffbeb; }
.risk-low { border-left-color: #10b981; background: #f0fdf4; }

footer {
    text-align: center;
    padding: 1.5rem;
    background: #f8fafc;
    color: #6b7280;
    border-top: 1px solid #e5e7eb;
}

.footer-links {
    margin-top: 0.5rem;
}

.footer-links a {
    color: #4f46e5;
    text-decoration: none;
    margin: 0 10px;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* 模态框样式 */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: white;
    margin: 15% auto;
    padding: 2rem;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    position: relative;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 1rem;
    top: 1rem;
}

.close:hover {
    color: black;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .input-section {
        flex-direction: column;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 1rem;
    }
}