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

:root {
    --primary-color: #3b82f6;
    --secondary-color: #1e40af;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-color: #1f2937;
    --light-color: #f8fafc;
    --border-color: #e2e8f0;
    --text-color: #374151;
    --text-muted: #6b7280;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header h1 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 0.5rem;
}

.nav {
    background: white;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-list {
    display: flex;
    list-style: none;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 0.8rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.main {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.5rem;
    color: var(--dark-color);
    margin-bottom: 1rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark-color);
}

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

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

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-block {
    width: 100%;
}

.method-selector {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.method-option {
    flex: 1;
    min-width: 150px;
}

.method-option input[type="radio"] {
    display: none;
}

.method-label {
    display: block;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.method-option input[type="radio"]:checked + .method-label {
    border-color: var(--primary-color);
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

.results {
    margin-top: 2rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 1rem;
}

.result-card {
    background: white;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    overflow: hidden;
}

.result-header {
    padding: 1rem;
    font-weight: 600;
    text-align: center;
}

.result-header.live {
    background-color: var(--success-color);
    color: white;
}

.result-header.banned {
    background-color: var(--danger-color);
    color: white;
}

.result-header.unknown {
    background-color: var(--warning-color);
    color: white;
}

.result-content {
    padding: 1rem;
    max-height: 300px;
    overflow-y: auto;
}

.result-item {
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    background-color: var(--light-color);
    border-radius: 4px;
    font-family: monospace;
    word-break: break-all;
}

.copy-btn {
    margin-top: 1rem;
    font-size: 0.9rem;
}

.tfa-display {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
    border-radius: 12px;
    margin: 2rem 0;
}

.tfa-code {
    font-size: 3rem;
    font-weight: bold;
    letter-spacing: 0.5rem;
    margin: 1rem 0;
    font-family: monospace;
}

.tfa-timer {
    font-size: 1.2rem;
    margin-top: 1rem;
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    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); }
}

.footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

@media (max-width: 768px) {
    .nav-list {
        gap: 0.3rem;
        padding: 0.5rem 0;
    }

    .nav-link {
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .card {
        padding: 1.5rem;
        margin: 0 0.5rem 1rem;
    }

    .method-selector {
        flex-direction: column;
    }

    .method-option {
        min-width: auto;
    }

    .results-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .tfa-code {
        font-size: 2rem;
        letter-spacing: 0.3rem;
    }

    .container {
        padding: 0 0.5rem;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.3rem;
    }
    
    .card {
        margin: 0 0.25rem 1rem;
        padding: 1rem;
    }
    
    .tfa-code {
        font-size: 1.8rem;
        letter-spacing: 0.2rem;
    }
}

/* 页面描述样式 */
.page-description {
    background: #f8fafc;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.page-description p {
    color: var(--text-muted);
    font-size: 1rem;
    margin: 0;
    font-weight: 500;
}

/* 广告位样式 */
.ad-container {
    margin: 2rem 0;
    text-align: center;
    background: #f8f9fa;
    border: 2px dashed #dee2e6;
    border-radius: 8px;
    padding: 2rem;
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.ad-container img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease;
}

.ad-container img:hover {
    transform: scale(1.02);
}

.ad-container h3 {
    color: #6c757d;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.ad-container p {
    color: #adb5bd;
    font-size: 0.9rem;
    margin: 0;
}

.ad-container.banner {
    min-height: 90px;
    padding: 1rem;
}

.ad-container.sidebar {
    min-height: 300px;
    margin: 1rem 0;
}

.ad-container.footer {
    min-height: 120px;
    margin-top: 3rem;
    background: #e9ecef;
    border-color: #ced4da;
}

@media (max-width: 768px) {
    .ad-container {
        margin: 1rem 0;
        padding: 1.5rem;
        min-height: 200px;
    }
    
    .ad-container.banner {
        min-height: 80px;
        padding: 0.8rem;
    }
    
    .ad-container.sidebar {
        min-height: 250px;
    }
    
    .ad-container.footer {
        min-height: 100px;
        margin-top: 2rem;
    }
}