/* ============================================
   Time Zone Converter - Modern UI
   ============================================ */

/* CSS Variables for theming */
:root {
    --tz-primary: #0ea5e9;
    --tz-primary-dark: #0284c7;
    --tz-secondary: #8b5cf6;
    --tz-success: #10b981;
    --tz-warning: #f59e0b;
    --tz-error: #ef4444;
    --tz-bg: #ffffff;
    --tz-surface: #f8fafc;
    --tz-surface-hover: #f1f5f9;
    --tz-text: #0f172a;
    --tz-text-secondary: #64748b;
    --tz-border: #e2e8f0;
    --tz-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --tz-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --tz-radius: 12px;
    --tz-radius-sm: 8px;
    --tz-transition: all 0.3s ease;
}

/* Dark mode variables */
[data-theme="dark"] {
    --tz-bg: #0f172a;
    --tz-surface: #1e293b;
    --tz-surface-hover: #334155;
    --tz-text: #f8fafc;
    --tz-text-secondary: #94a3b8;
    --tz-border: #334155;
    --tz-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --tz-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

/* Container */
.timezone-converter-wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--tz-text);
    background: var(--tz-bg);
    line-height: 1.6;
    position: relative;
}

/* Theme Toggle */
.tz-theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--tz-surface);
    border: 1px solid var(--tz-border);
    border-radius: 50px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: var(--tz-transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--tz-text-secondary);
    z-index: 10;
}

.tz-theme-toggle:hover {
    background: var(--tz-surface-hover);
    transform: translateY(-1px);
}

.tz-theme-toggle .toggle-icon {
    width: 18px;
    height: 18px;
}

/* Header Section */
.tz-header {
    text-align: center;
    margin-bottom: 3rem;
    padding-top: 1rem;
}

.tz-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--tz-primary) 0%, var(--tz-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tz-header p {
    font-size: 1.125rem;
    color: var(--tz-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Main Card */
.tz-card {
    background: var(--tz-surface);
    border-radius: var(--tz-radius);
    box-shadow: var(--tz-shadow-lg);
    padding: 2.5rem;
    margin-bottom: 3rem;
    border: 1px solid var(--tz-border);
}

/* Form Elements */
.tz-form-group {
    margin-bottom: 1.5rem;
}

.tz-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--tz-text);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tz-select,
.tz-input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--tz-border);
    border-radius: var(--tz-radius-sm);
    background: var(--tz-bg);
    color: var(--tz-text);
    transition: var(--tz-transition);
    box-sizing: border-box;
    font-family: inherit;
}

.tz-select:focus,
.tz-input:focus {
    outline: none;
    border-color: var(--tz-primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.tz-select[multiple] {
    min-height: 120px;
    padding: 0.5rem;
}

.tz-select[multiple] option {
    padding: 0.5rem;
    border-radius: 4px;
    margin-bottom: 2px;
}

.tz-select[multiple] option:checked {
    background: linear-gradient(135deg, var(--tz-primary) 0%, var(--tz-primary-dark) 100%);
    color: white;
}

.tz-select[multiple] option:hover {
    background: var(--tz-surface-hover);
}

/* Grid Layout */
.tz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* Checkbox/Radio Group */
.tz-format-group {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.tz-radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    background: var(--tz-bg);
    border: 2px solid var(--tz-border);
    border-radius: var(--tz-radius-sm);
    transition: var(--tz-transition);
}

.tz-radio-label:hover {
    border-color: var(--tz-primary);
}

.tz-radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--tz-primary);
}

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

/* Buttons */
.tz-btn {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--tz-radius-sm);
    cursor: pointer;
    transition: var(--tz-transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
}

.tz-btn-primary {
    background: linear-gradient(135deg, var(--tz-primary) 0%, var(--tz-primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(14, 165, 233, 0.2);
}

.tz-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(14, 165, 233, 0.3);
}

.tz-btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.tz-btn-secondary {
    background: var(--tz-surface-hover);
    color: var(--tz-text);
    border: 1px solid var(--tz-border);
}

.tz-btn-secondary:hover {
    background: var(--tz-border);
}

.tz-btn-success {
    background: var(--tz-success);
    color: white;
}

.tz-btn-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

/* Loading Animation */
.tz-loading {
    display: none;
    text-align: center;
    padding: 3rem;
}

.tz-loading.active {
    display: block;
}

.tz-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--tz-border);
    border-top-color: var(--tz-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.tz-loading p {
    color: var(--tz-text-secondary);
    font-size: 1.125rem;
}

/* Results Section */
.tz-results {
    display: none;
    margin-top: 2rem;
    animation: fadeIn 0.5s ease;
}

.tz-results.active {
    display: block;
}

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

/* Tabs */
.tz-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--tz-border);
    padding-bottom: 0;
    overflow-x: auto;
}

.tz-tab {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    color: var(--tz-text-secondary);
    font-weight: 600;
    cursor: pointer;
    position: relative;
    transition: var(--tz-transition);
    white-space: nowrap;
}

.tz-tab:hover {
    color: var(--tz-primary);
}

.tz-tab.active {
    color: var(--tz-primary);
}

.tz-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--tz-primary);
}

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

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

/* Schedule Table */
.tz-table-container {
    overflow-x: auto;
    border-radius: var(--tz-radius-sm);
    border: 1px solid var(--tz-border);
    margin-bottom: 1.5rem;
}

.tz-schedule-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--tz-bg);
    min-width: 600px;
}

.tz-schedule-table th,
.tz-schedule-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--tz-border);
}

.tz-schedule-table th {
    background: var(--tz-surface-hover);
    font-weight: 700;
    color: var(--tz-text);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    position: sticky;
    top: 0;
    z-index: 1;
}

.tz-schedule-table tr:hover {
    background: var(--tz-surface-hover);
}

.tz-schedule-table td {
    color: var(--tz-text-secondary);
}

.tz-time-cell {
    font-family: 'Consolas', 'Monaco', monospace;
    font-weight: 600;
    color: var(--tz-text);
}

.tz-current-time {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
    border-left: 3px solid var(--tz-success);
}

.tz-current-time .tz-time-cell {
    color: var(--tz-success);
    font-weight: 700;
}

.tz-timezone-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    background: var(--tz-surface);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
}

.tz-offset {
    color: var(--tz-text-secondary);
    font-size: 0.875rem;
}

/* Info Cards */
.tz-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.tz-info-card {
    background: var(--tz-bg);
    padding: 1.5rem;
    border-radius: var(--tz-radius-sm);
    border: 1px solid var(--tz-border);
    text-align: center;
}

.tz-info-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--tz-primary);
    margin-bottom: 0.25rem;
}

.tz-info-label {
    font-size: 0.875rem;
    color: var(--tz-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Export Options */
.tz-export-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.tz-export-card {
    background: var(--tz-bg);
    border: 2px solid var(--tz-border);
    border-radius: var(--tz-radius-sm);
    padding: 2rem;
    text-align: center;
    transition: var(--tz-transition);
    cursor: pointer;
}

.tz-export-card:hover {
    border-color: var(--tz-primary);
    transform: translateY(-4px);
    box-shadow: var(--tz-shadow);
}

.tz-export-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--tz-primary) 0%, var(--tz-secondary) 100%);
    border-radius: var(--tz-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.tz-export-title {
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--tz-text);
}

.tz-export-desc {
    font-size: 0.875rem;
    color: var(--tz-text-secondary);
    margin-bottom: 1.5rem;
}

/* Error Message */
.tz-error {
    display: none;
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    padding: 1rem 1.5rem;
    border-radius: var(--tz-radius-sm);
    margin-top: 1rem;
    align-items: center;
    gap: 0.75rem;
}

[data-theme="dark"] .tz-error {
    background: #450a0a;
    border-color: #7f1d1d;
    color: #fecaca;
}

.tz-error.active {
    display: flex;
}

/* Success Message */
.tz-success-msg {
    display: none;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
    padding: 1rem 1.5rem;
    border-radius: var(--tz-radius-sm);
    margin-top: 1rem;
}

[data-theme="dark"] .tz-success-msg {
    background: #052e16;
    border-color: #166534;
    color: #bbf7d0;
}

.tz-success-msg.active {
    display: block;
}

/* Helper Text */
.tz-helper {
    font-size: 0.875rem;
    color: var(--tz-text-secondary);
    margin-top: 0.5rem;
}

/* SEO Content Section */
.tz-seo-content {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 2px solid var(--tz-border);
}

.tz-seo-content h1 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--tz-text);
    line-height: 1.2;
}

.tz-seo-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--tz-text);
}

.tz-seo-content h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--tz-text);
}

.tz-seo-content p {
    margin-bottom: 1.25rem;
    color: var(--tz-text-secondary);
    line-height: 1.8;
}

.tz-seo-content ul,
.tz-seo-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.tz-seo-content li {
    margin-bottom: 0.75rem;
    color: var(--tz-text-secondary);
}

.tz-seo-content strong {
    color: var(--tz-text);
    font-weight: 600;
}

.tz-seo-content a {
    color: var(--tz-primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: var(--tz-transition);
}

.tz-seo-content a:hover {
    border-bottom-color: var(--tz-primary);
}

.tz-seo-content code {
    background: var(--tz-surface-hover);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
    color: var(--tz-primary);
}

/* FAQ Section */
.tz-faq {
    margin-top: 2rem;
}

.tz-faq-item {
    background: var(--tz-surface);
    border: 1px solid var(--tz-border);
    border-radius: var(--tz-radius-sm);
    margin-bottom: 1rem;
    overflow: hidden;
}

.tz-faq-question {
    padding: 1.25rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--tz-transition);
    color: var(--tz-text);
}

.tz-faq-question:hover {
    background: var(--tz-surface-hover);
}

.tz-faq-answer {
    padding: 0 1.25rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    color: var(--tz-text-secondary);
}

.tz-faq-item.active .tz-faq-answer {
    padding: 0 1.25rem 1.25rem;
    max-height: 500px;
}

.tz-faq-icon {
    transition: transform 0.3s ease;
    color: var(--tz-primary);
}

.tz-faq-item.active .tz-faq-icon {
    transform: rotate(180deg);
}

/* Breadcrumb */
.tz-breadcrumb {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    font-size: 0.875rem;
    color: var(--tz-text-secondary);
    flex-wrap: wrap;
}

.tz-breadcrumb a {
    color: var(--tz-primary);
    text-decoration: none;
}

.tz-breadcrumb a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .timezone-converter-wrap {
        padding: 1rem;
    }
    
    .tz-header h2 {
        font-size: 1.875rem;
    }
    
    .tz-card {
        padding: 1.5rem;
    }
    
    .tz-grid {
        grid-template-columns: 1fr;
    }
    
    .tz-btn-group {
        flex-direction: column;
    }
    
    .tz-btn {
        width: 100%;
    }
    
    .tz-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
    }
    
    .tz-schedule-table {
        font-size: 0.875rem;
    }
    
    .tz-schedule-table th,
    .tz-schedule-table td {
        padding: 0.75rem;
    }
    
    .tz-seo-content h1 {
        font-size: 1.75rem;
    }
    
    .tz-seo-content h2 {
        font-size: 1.375rem;
    }
}

/* Print styles */
@media print {
    .tz-theme-toggle,
    .tz-input-section,
    .tz-tabs,
    .tz-export-card {
        display: none !important;
    }
    
    .tz-results {
        display: block !important;
    }
    
    .tz-tab-content {
        display: block !important;
    }
    
    .tz-schedule-table {
        page-break-inside: auto;
    }
    
    .tz-schedule-table tr {
        page-break-inside: avoid;
    }
}

/* Selection styling */
::selection {
    background: var(--tz-primary);
    color: white;
}

/* Scrollbar styling */
.tz-table-container::-webkit-scrollbar {
    height: 8px;
}

.tz-table-container::-webkit-scrollbar-track {
    background: var(--tz-surface);
}

.tz-table-container::-webkit-scrollbar-thumb {
    background: var(--tz-border);
    border-radius: 4px;
}

.tz-table-container::-webkit-scrollbar-thumb:hover {
    background: var(--tz-text-secondary);
}