/* Website Status Checker - Modern Slick Design */

/* ===============================================
   MODERN TOOL HEADER DESIGN
   =============================================== */
.tool-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--info-color) 100%);
    border-radius: var(--radius-xl);
    color: white;
    position: relative;
    overflow: hidden;
}

.tool-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.tool-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.tool-header p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

/* ===============================================
   MODERN SECTION CONTAINERS
   =============================================== */
.presets-section,
.input-section,
.options-section,
.results-section {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.presets-section::before,
.input-section::before,
.options-section::before,
.results-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color), var(--success-color));
}

.presets-section:hover,
.input-section:hover,
.options-section:hover,
.results-section:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-hover);
}

.checker-main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Section Headers */
.presets-section h2,
.input-section h2,
.options-section h2,
.results-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.presets-section h2 i,
.input-section h2 i,
.options-section h2 i,
.results-section h2 i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* ===============================================
   QUICK PRESETS SECTION
   =============================================== */
.presets-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.preset-categories {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.preset-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.875rem 1.75rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    font-weight: 600;
    position: relative;
    overflow: hidden;
    font-size: 0.95rem;
}

.preset-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.preset-btn:hover::before {
    left: 100%;
}

.preset-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.preset-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-lg);
}

.preset-preview {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    min-height: 150px;
    overflow: auto;
    transition: var(--transition);
}

.preset-preview:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.preset-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.preset-item {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.preset-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.preset-item i {
    color: var(--primary-color);
    font-size: 1.25rem;
    width: 1.5rem;
    text-align: center;
}

.preset-item-details {
    flex: 1;
}

.preset-item-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.preset-item-url {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: monospace;
}

.preset-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ===============================================
   INPUT METHODS SECTION
   =============================================== */
.input-methods {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.method-tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 2rem;
}

.tab-btn {
    background: var(--bg-secondary);
    border: none;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    font-weight: 600;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.tab-btn:hover::before {
    left: 100%;
}

.tab-btn:hover {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    box-shadow: var(--shadow-md);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.input-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.url-input-container {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.url-input {
    flex: 1;
    padding: 0.875rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

.url-input::placeholder {
    color: var(--text-muted);
}

.url-examples {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.example-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 600;
}

.example-url {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-family: monospace;
}

.example-url:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.bulk-textarea {
    width: 100%;
    min-height: 200px;
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    background: var(--bg-secondary);
    color: var(--text-primary);
    resize: vertical;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

.bulk-textarea::placeholder {
    color: var(--text-muted);
    font-style: italic;
}

.bulk-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.bulk-stats {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
}

/* File Upload */
.file-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.file-upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.8s;
}

.file-upload-area:hover::before {
    left: 100%;
}

.file-upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.file-upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.upload-text h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.upload-text p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    margin-top: 1rem;
}

.file-info:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.file-details {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.file-details i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* ===============================================
   OPTIONS SECTION
   =============================================== */
.options-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

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

.option-group {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.option-group::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.option-group:hover::before {
    left: 100%;
}

.option-group:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.option-group h3 {
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.checkbox-options,
.timeout-options,
.useragent-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.setting-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.setting-input {
    width: 80px;
    padding: 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    text-align: center;
    font-weight: 600;
    transition: var(--transition);
}

.setting-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

/* Radio Buttons */
.radio-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
}

.radio-label:hover {
    background: rgba(59, 130, 246, 0.05);
    border-color: var(--primary-color);
}

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

.radio-btn {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
}

.radio-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    opacity: 0;
    transition: var(--transition);
}

.radio-label input[type="radio"]:checked + .radio-btn {
    border-color: var(--primary-color);
}

.radio-label input[type="radio"]:checked + .radio-btn::after {
    opacity: 1;
}

.radio-label input[type="radio"]:checked ~ span {
    color: var(--primary-color);
    font-weight: 600;
}

/* Checkboxes */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
}

.checkbox-label:hover {
    background: rgba(59, 130, 246, 0.05);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
}

.checkmark::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 6px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    opacity: 0;
    transition: var(--transition);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    opacity: 1;
}

.checkbox-label input[type="checkbox"]:checked ~ span {
    color: var(--primary-color);
    font-weight: 600;
}

/* ===============================================
   RESULTS SECTION
   =============================================== */
.results-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    text-align: center;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-value.success {
    color: var(--success-color);
}

.stat-value.error {
    color: var(--error-color);
}

.results-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.results-list {
    min-height: 200px;
    max-height: 600px;
    overflow-y: auto;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    text-align: center;
    color: var(--text-muted);
    height: 200px;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.result-item {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
}

.result-item:last-child {
    border-bottom: none;
}

.result-item:hover {
    background: var(--bg-tertiary);
}

.result-item.checking {
    background: rgba(59, 130, 246, 0.05);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.result-url {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
    word-break: break-all;
}

.status-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-badge.online {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.status-badge.offline {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.status-badge.checking {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.result-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.detail-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===============================================
   MODERN BUTTON SYSTEM
   =============================================== */
.btn {
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
}

.btn-secondary {
    background: linear-gradient(135deg, var(--text-muted), var(--text-secondary));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #16a34a);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error-color), #dc2626);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
    font-weight: 700;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn:disabled::before {
    display: none;
}

/* ===============================================
   SEO CONTENT SECTIONS
   =============================================== */
.seo-content {
    margin-top: 4rem;
}

.seo-content section {
    padding: 4rem 0;
    margin-bottom: 2rem;
}

.seo-content section:nth-child(even) {
    background: var(--bg-secondary);
}

.seo-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 3rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.seo-content h2 i {
    color: var(--primary-color);
    font-size: 2rem;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.step-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.step-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color));
}

.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.step-number {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.step-number::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.features-container {
    margin: 2rem 0;
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 2rem;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-hover);
}

.feature-item i {
    width: 3.5rem;
    height: 3.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    box-shadow: var(--shadow-lg);
}

.feature-item h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.use-case-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.use-case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--success-color), var(--warning-color));
}

.use-case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.use-case-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.use-case-card:hover .use-case-icon {
    transform: scale(1.1);
}

.use-case-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.use-case-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-question h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 600;
}

.faq-question i {
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===============================================
   RESPONSIVE DESIGN
   =============================================== */
@media (max-width: 1024px) {
    .option-groups {
        grid-template-columns: 1fr;
    }
    
    .steps-grid,
    .features-list {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    .url-input-container {
        flex-direction: column;
    }

    .bulk-actions {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .tool-header {
        padding: 2rem 1rem;
        margin-bottom: 2rem;
    }

    .tool-header h1 {
        font-size: 2.25rem;
        flex-direction: column;
        gap: 0.5rem;
    }

    .tool-header p {
        font-size: 1rem;
    }

    .presets-section,
    .input-section,
    .options-section,
    .results-section {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .seo-content h2 {
        font-size: 2rem;
        flex-direction: column;
        gap: 0.5rem;
    }

    .preset-categories {
        flex-direction: column;
    }

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

    .tab-btn {
        border-radius: var(--radius-lg);
        margin-bottom: 0.5rem;
    }

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

    .results-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .steps-grid,
    .features-list,
    .use-cases-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .feature-item {
        flex-direction: column;
        text-align: center;
    }

    .feature-item i {
        width: 3rem;
        height: 3rem;
        font-size: 1.25rem;
    }

    .result-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .result-details {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .tool-header {
        padding: 1.5rem 1rem;
    }
    
    .tool-header h1 {
        font-size: 1.875rem;
    }

    .seo-content h2 {
        font-size: 1.5rem;
    }

    .presets-section,
    .input-section,
    .options-section,
    .results-section {
        padding: 1rem;
    }

    .preset-btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }

    .bulk-textarea {
        min-height: 150px;
        font-size: 0.8rem;
    }

    .file-upload-area {
        padding: 2rem 1rem;
    }

    .upload-icon {
        font-size: 2rem;
    }

    .upload-text h3 {
        font-size: 1rem;
    }

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

    .step-card,
    .feature-item,
    .use-case-card {
        padding: 1.5rem;
    }

    .step-number,
    .use-case-icon {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }

    .feature-item i {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }

    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }

    .btn-large {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }
}