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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 1.1rem;
}

.input-section {
    margin-bottom: 30px;
}

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

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
}

.input-wrapper {
    display: flex;
    gap: 10px;
}

#url-input {
    flex: 1;
    padding: 14px 18px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

#url-input:focus {
    outline: none;
    border-color: #667eea;
}

.check-button {
    padding: 14px 32px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.check-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.check-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.options {
    margin-top: 15px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: #666;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.progress-section {
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 4px;
}

.progress-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #666;
}

.results-section {
    margin-top: 30px;
}

.results-header {
    margin-bottom: 20px;
}

.results-header h2 {
    color: #333;
    margin-bottom: 20px;
}

.summary {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.stat {
    flex: 1;
    min-width: 150px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    text-align: center;
}

.stat.broken {
    background: #fee;
    border: 2px solid #fcc;
}

.stat.working {
    background: #efe;
    border: 2px solid #cfc;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 5px;
}

.stat.broken .stat-value {
    color: #d32f2f;
}

.stat.working .stat-value {
    color: #2e7d32;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
}

.filter-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid #e0e0e0;
}

.tab-btn {
    padding: 10px 20px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    color: #666;
    transition: all 0.3s;
    margin-bottom: -2px;
}

.tab-btn:hover {
    color: #667eea;
}

.tab-btn.active {
    color: #667eea;
    border-bottom-color: #667eea;
    font-weight: 600;
}

.results-list {
    max-height: 600px;
    overflow-y: auto;
}

.result-item {
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 8px;
    border-left: 4px solid #e0e0e0;
    background: #f8f9fa;
    transition: all 0.3s;
}

.result-item:hover {
    background: #f0f0f0;
    transform: translateX(5px);
}

.result-item.broken {
    border-left-color: #d32f2f;
    background: #fee;
}

.result-item.working {
    border-left-color: #2e7d32;
    background: #efe;
}

.result-item.hidden {
    display: none;
}

.result-url {
    font-weight: 600;
    color: #333;
    word-break: break-all;
    margin-bottom: 5px;
}

.result-status {
    font-size: 0.9rem;
    color: #666;
}

.result-item.broken .result-status {
    color: #d32f2f;
    font-weight: 600;
}

.result-item.working .result-status {
    color: #2e7d32;
}

.error-section {
    padding: 20px;
    background: #fee;
    border: 2px solid #fcc;
    border-radius: 8px;
    color: #d32f2f;
    margin-top: 20px;
}

.hidden {
    display: none;
}

/* Scrollbar styling */
.results-list::-webkit-scrollbar {
    width: 8px;
}

.results-list::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.results-list::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

.results-list::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 2rem;
    }

    .input-wrapper {
        flex-direction: column;
    }

    .check-button {
        width: 100%;
    }

    .summary {
        flex-direction: column;
    }

    .stat {
        min-width: 100%;
    }
}