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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--primary-color);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-brand i {
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    gap: 1rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: all 0.3s;
    font-weight: 500;
}

.nav-link:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.nav-link.active {
    background: var(--primary-color);
    color: white;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.main-content {
    padding: 1.5rem 2rem;
}

/* Header Section */
.header-section {
    text-align: center;
    margin-bottom: 1.5rem;
    color: white;
}

.header-section h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.header-section p {
    font-size: 1.1rem;
    opacity: 0.95;
}

/* Test Container */
.test-container {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.form-section {
    padding: 1.5rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group.full-width {
    width: 100%;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.7rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Options Grid */
.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.option-card {
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 0.5rem;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

#secureOptions select,
#authOptions input {
    margin-top: 0.5rem;
}

#authOptions input {
    margin-bottom: 0.5rem;
}

/* Buttons */
.btn-test {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
    transition: all 0.3s;
}

.btn-test:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3);
}

.btn-copy {
    padding: 0.5rem 1rem;
    background: var(--text-secondary);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.btn-copy:hover {
    background: var(--text-primary);
}

/* Result Section */
.result-section {
    border-top: 2px solid var(--border-color);
    padding: 1.5rem;
    background: var(--bg-color);
}

.result-message {
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.result-message.success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success-color);
}

.result-message.error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--error-color);
}

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

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: #1e293b;
    color: white;
}

.log-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#logContent {
    padding: 1rem;
    background: #0f172a;
    color: #10b981;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    overflow-x: auto;
    max-height: 300px;
    overflow-y: auto;
    margin: 0;
}

/* DNS Specific Styles */
.dns-container {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 1.5rem;
}

.dns-form-section {
    margin-bottom: 1.5rem;
}

.dns-results {
    margin-top: 1.5rem;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--primary-color);
}

.result-header h2 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.records-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1rem;
}

.record-card {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s;
}

.record-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.record-card.highlight {
    border-color: var(--primary-color);
}

.record-card.warning {
    border-color: var(--warning-color);
    background: #fffbeb;
}

.record-card.full-width {
    grid-column: 1 / -1;
}

.record-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: white;
    border-bottom: 2px solid var(--border-color);
}

.record-header h3 {
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.badge {
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-success {
    padding: 0.25rem 0.75rem;
    background: var(--success-color);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-warning {
    padding: 0.25rem 0.75rem;
    background: var(--warning-color);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.record-content {
    padding: 1rem;
}

.record-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: white;
    border-radius: 6px;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.record-item:last-child {
    margin-bottom: 0;
}

.record-item.full {
    flex-direction: column;
    align-items: flex-start;
}

.record-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.record-value {
    color: var(--text-primary);
    font-weight: 500;
    word-break: break-all;
}

.record-ttl {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--bg-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.dkim-record {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.dkim-record:last-child {
    margin-bottom: 0;
}

.dkim-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
    font-weight: 600;
}

.dkim-domain {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: normal;
}

.dkim-value code {
    display: block;
    background: #f8fafc;
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem;
    word-break: break-all;
    border: 1px solid var(--border-color);
}

code {
    background: #f1f5f9;
    padding: 0.5rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    display: block;
    word-break: break-all;
}

/* Info Section */
.info-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.info-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.info-card h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.info-card ul {
    list-style: none;
}

.info-card ul li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.info-card ul li:last-child {
    border-bottom: none;
}

.info-card p {
    color: var(--text-secondary);
}

/* Footer */
footer {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .records-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        width: 100%;
        justify-content: center;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .header-section h1 {
        font-size: 1.5rem;
    }
    
    .result-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

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

.record-card {
    animation: fadeIn 0.5s ease;
}