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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    max-width: 700px;
    width: 100%;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
}

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

.header h1 {
    font-size: 2.5em;
    color: #333;
    margin-bottom: 10px;
}

.header p {
    color: #666;
    font-size: 1.1em;
}

/* Tab Navigation */
.tab-navigation {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid #eee;
}

.tab-btn {
    flex: 1;
    padding: 15px 20px;
    font-size: 1.1em;
    font-weight: 600;
    color: #666;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    transition: all 0.3s;
}

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

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

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.input-group {
    margin-bottom: 25px;
}

.input-group label {
    display: block;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
    font-size: 1.1em;
}

#schoolName,
#domainInput {
    width: 100%;
    padding: 15px;
    font-size: 1.1em;
    border: 2px solid #ddd;
    border-radius: 10px;
    transition: all 0.3s;
}

#schoolName:focus,
#domainInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.tld-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.tld-checkbox {
    display: flex;
    align-items: center;
    padding: 12px;
    background: #f8f9fa;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1em;
}

.tld-checkbox:hover {
    background: #e9ecef;
}

.tld-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: 8px;
    cursor: pointer;
}

.check-btn {
    width: 100%;
    padding: 18px;
    font-size: 1.2em;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.check-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.check-btn:active {
    transform: translateY(0);
}

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

.loader {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

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

.results-section {
    margin-top: 40px;
    animation: fadeIn 0.5s;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #eee;
}

.results-header h2 {
    color: #333;
    font-size: 1.8em;
}

.copy-all-btn {
    padding: 10px 20px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.copy-all-btn:hover {
    background: #218838;
    transform: translateY(-2px);
}

.domain-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.domain-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: #f8f9fa;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    transition: all 0.3s;
}

.domain-item:hover {
    background: #e9ecef;
    transform: translateX(5px);
}

.domain-item.available {
    border-left-color: #28a745;
}

.domain-item.unavailable {
    border-left-color: #dc3545;
    opacity: 0.7;
}

.domain-name {
    font-size: 1.1em;
    font-weight: 500;
    color: #333;
    font-family: 'Courier New', monospace;
}

.domain-status {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 600;
    margin-left: 10px;
}

.domain-status.available {
    background: #d4edda;
    color: #155724;
}

.domain-status.unavailable {
    background: #f8d7da;
    color: #721c24;
}

.copy-btn {
    padding: 8px 16px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.9em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.copy-btn:hover {
    background: #5568d3;
}

.copy-btn.copied {
    background: #28a745;
}

.error-section {
    margin-top: 20px;
    padding: 15px;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 10px;
    color: #721c24;
    text-align: center;
    animation: fadeIn 0.5s;
}

@media (max-width: 600px) {
    .container {
        padding: 25px;
    }

    .header h1 {
        font-size: 2em;
    }

    .tab-btn {
        font-size: 1em;
        padding: 12px 15px;
    }

    .tld-options {
        grid-template-columns: repeat(2, 1fr);
    }

    .results-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .copy-all-btn {
        width: 100%;
    }
}