/**
 * IT UTILITY ENGINE - STYLES
 * Professional IT Tools Module Styling
 * Pure CSS - Zero Dependencies
 * 
 * @author WHITEHAT Engineering Team
 * @version 1.0.0
 */

/* ============================================
   ROOT VARIABLES
   ============================================ */
:root {
    --itu-primary: #2563eb;
    --itu-primary-hover: #1d4ed8;
    --itu-success: #10b981;
    --itu-warning: #f59e0b;
    --itu-error: #ef4444;
    --itu-bg-primary: #ffffff;
    --itu-bg-secondary: #f8fafc;
    --itu-bg-tertiary: #f1f5f9;
    --itu-border: #e2e8f0;
    --itu-text-primary: #1e293b;
    --itu-text-secondary: #475569;
    --itu-text-muted: #64748b;
    --itu-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --itu-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --itu-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --itu-radius-sm: 6px;
    --itu-radius-md: 8px;
    --itu-radius-lg: 12px;
}

/* ============================================
   MAIN CONTAINER
   ============================================ */
.it-utility-engine {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--itu-bg-primary);
    border-radius: var(--itu-radius-lg);
    box-shadow: var(--itu-shadow-lg);
    overflow: hidden;
}

/* ============================================
   NAVIGATION TABS
   ============================================ */
.itu-tabs {
    display: flex;
    background: var(--itu-bg-secondary);
    border-bottom: 2px solid var(--itu-border);
    overflow-x: auto;
    scrollbar-width: thin;
}

.itu-tabs::-webkit-scrollbar {
    height: 4px;
}

.itu-tabs::-webkit-scrollbar-track {
    background: var(--itu-bg-tertiary);
}

.itu-tabs::-webkit-scrollbar-thumb {
    background: var(--itu-border);
    border-radius: 2px;
}

.itu-tab {
    flex: 1;
    min-width: 140px;
    padding: 16px 20px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--itu-text-secondary);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    white-space: nowrap;
}

.itu-tab:hover {
    background: rgba(37, 99, 235, 0.05);
    color: var(--itu-primary);
}

.itu-tab.active {
    background: var(--itu-bg-primary);
    color: var(--itu-primary);
    border-bottom-color: var(--itu-primary);
    font-weight: 600;
}

.itu-tab i {
    font-size: 16px;
}

/* ============================================
   CONTENT PANELS
   ============================================ */
.itu-content {
    position: relative;
    min-height: 400px;
}

.itu-panel {
    display: none;
    padding: 32px;
    animation: ituFadeIn 0.3s ease;
}

.itu-panel.active {
    display: block;
}

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

.itu-panel-content h3 {
    margin: 0 0 24px 0;
    font-size: 24px;
    font-weight: 700;
    color: var(--itu-text-primary);
}

/* ============================================
   FORM ELEMENTS
   ============================================ */
.itu-form-group {
    margin-bottom: 20px;
}

.itu-form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--itu-text-primary);
}

.itu-form-group input[type="text"],
.itu-form-group input[type="number"],
.itu-form-group select {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    border: 2px solid var(--itu-border);
    border-radius: var(--itu-radius-sm);
    background: var(--itu-bg-primary);
    color: var(--itu-text-primary);
    transition: all 0.2s ease;
    font-family: inherit;
}

.itu-form-group input[type="text"]:focus,
.itu-form-group input[type="number"]:focus,
.itu-form-group select:focus {
    outline: none;
    border-color: var(--itu-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.itu-form-group input[type="text"]::placeholder {
    color: var(--itu-text-muted);
}

/* Checkbox Group */
.itu-checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.itu-checkbox-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 500;
    color: var(--itu-text-primary);
    cursor: pointer;
    padding: 10px;
    border-radius: var(--itu-radius-sm);
    transition: background 0.2s ease;
}

.itu-checkbox-group label:hover {
    background: var(--itu-bg-secondary);
}

.itu-checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--itu-primary);
}

/* ============================================
   BUTTONS
   ============================================ */
.itu-btn-primary {
    padding: 12px 24px;
    background: var(--itu-primary);
    color: white;
    border: none;
    border-radius: var(--itu-radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--itu-shadow-sm);
}

.itu-btn-primary:hover {
    background: var(--itu-primary-hover);
    box-shadow: var(--itu-shadow-md);
    transform: translateY(-1px);
}

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

.itu-btn-copy {
    padding: 8px 16px;
    background: var(--itu-bg-secondary);
    color: var(--itu-text-primary);
    border: 1px solid var(--itu-border);
    border-radius: var(--itu-radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.itu-btn-copy:hover {
    background: var(--itu-primary);
    color: white;
    border-color: var(--itu-primary);
}

.itu-btn-copy.copied {
    background: var(--itu-success);
    color: white;
    border-color: var(--itu-success);
}

/* ============================================
   RESULT CONTAINERS
   ============================================ */
.itu-result {
    margin-top: 24px;
}

.itu-result-success {
    background: var(--itu-bg-secondary);
    border: 1px solid var(--itu-border);
    border-radius: var(--itu-radius-md);
    padding: 24px;
}

.itu-result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--itu-border);
}

.itu-result-header h4 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--itu-text-primary);
}

.itu-result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.itu-result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--itu-bg-primary);
    border-radius: var(--itu-radius-sm);
    border: 1px solid var(--itu-border);
}

.itu-result-item .label {
    font-size: 13px;
    font-weight: 600;
    color: var(--itu-text-secondary);
}

.itu-result-item .value {
    font-size: 14px;
    font-weight: 600;
    color: var(--itu-text-primary);
    font-family: 'Courier New', monospace;
}

.itu-result-item .value.highlight {
    color: var(--itu-primary);
    font-size: 15px;
}

/* ============================================
   ERROR STATE
   ============================================ */
.itu-result-error {
    background: #fef2f2;
    border: 2px solid #fecaca;
    border-radius: var(--itu-radius-md);
    padding: 20px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.itu-error-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--itu-error);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.itu-error-message {
    flex: 1;
    color: #991b1b;
    font-size: 14px;
    line-height: 1.6;
}

.itu-error-message strong {
    display: block;
    margin-bottom: 4px;
    font-size: 15px;
}

/* ============================================
   PASSWORD DISPLAY
   ============================================ */
.itu-password-display {
    background: var(--itu-bg-primary);
    border: 2px solid var(--itu-primary);
    border-radius: var(--itu-radius-md);
    padding: 20px;
    margin-bottom: 20px;
}

.itu-password-text {
    display: block;
    font-size: 20px;
    font-weight: 600;
    color: var(--itu-primary);
    font-family: 'Courier New', monospace;
    word-break: break-all;
    letter-spacing: 1px;
}

.itu-password-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}

.itu-metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: var(--itu-bg-primary);
    border-radius: var(--itu-radius-sm);
    border: 1px solid var(--itu-border);
}

.itu-metric .label {
    font-size: 12px;
    font-weight: 600;
    color: var(--itu-text-secondary);
}

.itu-metric .value {
    font-size: 13px;
    font-weight: 600;
    color: var(--itu-text-primary);
}

.itu-security-note {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px;
    background: #eff6ff;
    border-radius: var(--itu-radius-sm);
    color: #1e40af;
    font-size: 12px;
}

/* ============================================
   DATA CONVERSION
   ============================================ */
.itu-conversion-input {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: var(--itu-radius-md);
    margin-bottom: 20px;
}

.itu-input-display {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}

.itu-input-display .label {
    font-size: 13px;
    font-weight: 600;
    opacity: 0.9;
}

.itu-input-display .value {
    font-size: 18px;
    font-weight: 700;
    font-family: 'Courier New', monospace;
}

.itu-conversion-section {
    margin-bottom: 24px;
}

.itu-conversion-section h5 {
    margin: 0 0 12px 0;
    font-size: 14px;
    font-weight: 700;
    color: var(--itu-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.itu-suggestion {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    border-radius: var(--itu-radius-sm);
    color: #92400e;
    font-size: 14px;
}

.itu-suggestion i {
    font-size: 20px;
    color: #f59e0b;
}

/* ============================================
   PORTS TABLE
   ============================================ */
.itu-ports-table {
    overflow-x: auto;
}

.itu-ports-table table {
    width: 100%;
    border-collapse: collapse;
}

.itu-ports-table th {
    position: sticky;
    top: 0;
    background: var(--itu-bg-secondary);
    z-index: 10;
}

/* ============================================
   CRON EXPRESSION
   ============================================ */
.itu-cron-expression code {
    display: block;
    padding: 16px;
    background: var(--itu-bg-primary);
    border: 2px dashed var(--itu-primary);
    border-radius: var(--itu-radius-md);
    text-align: center;
}

.itu-cron-description {
    margin-bottom: 24px;
}

.itu-cron-breakdown {
    margin-bottom: 24px;
}

.itu-cron-schedule {
    margin-bottom: 24px;
}

/* ============================================
   EMPTY STATE
   ============================================ */
.itu-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    .itu-panel {
        padding: 20px;
    }

    .itu-panel-content h3 {
        font-size: 20px;
        margin-bottom: 20px;
    }

    .itu-tab {
        min-width: 120px;
        padding: 12px 16px;
        font-size: 13px;
    }

    .itu-tab span {
        display: none;
    }

    .itu-tab i {
        font-size: 18px;
    }

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

    .itu-password-metrics {
        grid-template-columns: 1fr;
    }

    .itu-result-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .itu-password-text {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .it-utility-engine {
        border-radius: 0;
    }

    .itu-panel {
        padding: 16px;
    }

    .itu-result-success {
        padding: 16px;
    }

    .itu-form-group input,
    .itu-form-group select {
        font-size: 16px; /* Prevent iOS zoom */
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .itu-tabs,
    .itu-btn-primary,
    .itu-btn-copy {
        display: none;
    }

    .it-utility-engine {
        box-shadow: none;
        border: 1px solid #000;
    }

    .itu-panel {
        display: block !important;
        page-break-inside: avoid;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
.itu-tab:focus-visible,
.itu-btn-primary:focus-visible,
.itu-btn-copy:focus-visible,
.itu-form-group input:focus-visible,
.itu-form-group select:focus-visible {
    outline: 3px solid var(--itu-primary);
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}