:root {
    --surface: #ffffff;
    --surface-muted: #f8fafc;
    --surface-dark: #f1f5f9;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #6366f1;
    --primary-bg: #eef2ff;
    --accent: #06b6d4;
    --success: #10b981;
    --success-dark: #059669;
    --info: #3b82f6;
    --info-dark: #2563eb;
    --danger: #ef4444;
    --shadow-soft: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Converter Wrapper */
.punycode-converter-wrapper {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 40px;
}

/* Converter Card */
.converter-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    transition: var(--transition);
}

.converter-card:hover {
    box-shadow: var(--shadow-medium);
}

/* Converter Header */
.converter-header {
    background: var(--surface-muted);
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.converter-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
}

.converter-title i {
    color: var(--primary);
    font-size: 20px;
}

.converter-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-main);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.action-btn:hover {
    background: var(--surface-dark);
    border-color: var(--border-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.action-btn-primary {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.action-btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.action-btn i {
    font-size: 13px;
}

/* Converter Grid */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    padding: 20px;
}

/* Converter Panel */
.converter-panel {
    display: flex;
    flex-direction: column;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.converter-panel:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-soft);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
}

.panel-title i {
    color: var(--primary);
    font-size: 16px;
}

.panel-actions {
    display: flex;
    gap: 6px;
    align-items: center;
}

.panel-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-main);
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) - 2px);
    cursor: pointer;
    transition: var(--transition);
}

.panel-btn:hover {
    background: var(--surface-dark);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.panel-btn i {
    font-size: 12px;
}

.panel-btn-secondary {
    padding: 6px 10px;
    min-width: 32px;
}

.panel-btn-secondary span {
    display: none;
}

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

.panel-btn-success:hover {
    background: var(--success-dark);
    border-color: var(--success-dark);
}

.panel-btn-info {
    background: var(--info);
    color: white;
    border-color: var(--info);
}

.panel-btn-info:hover {
    background: var(--info-dark);
    border-color: var(--info-dark);
}

/* Panel Body */
.panel-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 300px;
}

.converter-input,
.converter-output {
    flex: 1;
    width: 100%;
    padding: 16px;
    
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-main);
    background: var(--surface);
    border: none;
    outline: none;
    resize: none;
    overflow-y: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    min-height: 250px;
}

.converter-input::placeholder {
    color: var(--text-light);
}

.converter-output {
    background: var(--surface-muted);
    color: var(--text-muted);
}

.converter-output:focus {
    background: var(--surface);
    color: var(--text-main);
}

/* Input/Output Footer */
.input-footer,
.output-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: var(--surface);
    border-top: 1px solid var(--border);
    font-size: 12px;
}

.char-count {
    color: var(--text-muted);
    font-weight: 500;
}

.example-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 500;
    color: var(--primary);
    background: var(--primary-bg);
    border: 1px solid var(--primary);
    border-radius: calc(var(--radius) - 2px);
    cursor: pointer;
    transition: var(--transition);
}

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

.example-btn i {
    font-size: 11px;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    font-size: 11px;
    font-weight: 600;
    border-radius: calc(var(--radius) - 2px);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-badge.success {
    background: #d1fae5;
    color: var(--success-dark);
}

.status-badge.error {
    background: #fee2e2;
    color: #dc2626;
}

/* Stats Card */
.stats-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    margin-top: 8px;
}

.stats-header {
    padding: 16px 20px;
    background: var(--surface-muted);
    border-bottom: 1px solid var(--border);
}

.stats-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
}

.stats-header i {
    color: var(--primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    padding: 20px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.stat-item:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-soft);
    transform: translateY(-2px);
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--primary-bg);
    border-radius: var(--radius);
    color: var(--primary);
    font-size: 20px;
    flex-shrink: 0;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 8px;
}

.info-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    transition: var(--transition);
}

.info-card:hover {
    box-shadow: var(--shadow-medium);
}

.info-header {
    padding: 16px 20px;
    background: var(--surface-muted);
    border-bottom: 1px solid var(--border);
}

.info-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
}

.info-header i {
    color: var(--primary);
}

.info-body {
    padding: 20px;
}

.info-body p {
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
}

.info-section {
    margin-bottom: 20px;
}

.info-section h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.info-section li {
    padding: 8px 0;
    padding-left: 24px;
    color: var(--text-muted);
    line-height: 1.6;
    position: relative;
}

.info-section li::before {
    content: '•';
    position: absolute;
    left: 8px;
    color: var(--primary);
    font-weight: bold;
}

.info-note {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px;
    background: var(--primary-bg);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    margin-top: 20px;
}

.info-note i {
    color: var(--primary);
    font-size: 18px;
    margin-top: 2px;
    flex-shrink: 0;
}

.info-note span {
    color: var(--text-main);
    font-size: 13px;
    line-height: 1.6;
}

/* Example Table */
.example-table {
    overflow-x: auto;
}

.example-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.example-table thead {
    background: var(--surface-muted);
}

.example-table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-main);
    border-bottom: 2px solid var(--border);
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.5px;
}

.example-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
}

.example-table tbody tr:hover {
    background: var(--surface-muted);
}

.example-table code {
    
    font-size: 12px;
    background: var(--surface-dark);
    padding: 4px 8px;
    border-radius: calc(var(--radius) - 2px);
    color: var(--primary);
}

/* Scrollbar Styling */
.converter-input::-webkit-scrollbar,
.converter-output::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.converter-input::-webkit-scrollbar-track,
.converter-output::-webkit-scrollbar-track {
    background: var(--surface-muted);
}

.converter-input::-webkit-scrollbar-thumb,
.converter-output::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.converter-input::-webkit-scrollbar-thumb:hover,
.converter-output::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* Mobile Responsive */
@media (max-width: 767px) {
    .converter-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 16px;
    }

    .converter-panel {
        min-height: 250px;
    }

    .converter-input,
    .converter-output {
        min-height: 200px;
        font-size: 13px;
        padding: 12px;
    }

    .panel-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .panel-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .panel-btn span {
        display: none;
    }

    .panel-btn-secondary {
        min-width: 32px;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .converter-actions {
        width: 100%;
    }

    .action-btn {
        flex: 1;
        justify-content: center;
    }

    .btn-label {
        display: none;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 16px;
    }

    .info-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .input-footer,
    .output-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

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

@media (max-width: 480px) {
    .converter-card {
        border-radius: 0;
        margin-left: -15px;
        margin-right: -15px;
        border-left: none;
        border-right: none;
    }

    .converter-grid {
        padding: 12px;
    }

    .converter-input,
    .converter-output {
        min-height: 180px;
        font-size: 12px;
        padding: 10px;
    }

    .stats-card,
    .info-card {
        border-radius: 0;
        margin-left: -15px;
        margin-right: -15px;
        border-left: none;
        border-right: none;
    }
}

/* Loading State */
.converter-panel.loading {
    position: relative;
}

.converter-panel.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

/* Success Animation */
@keyframes successPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.panel-btn-success:active {
    animation: successPulse 0.3s ease;
}

/* Copy Feedback */
.copy-feedback {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    background: var(--success);
    color: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}