/* Modern MIPS Simulator Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #475569;
    --highlight-color: #fbbf24;
    --register-modified: #fef3c7;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.app-header {
    background: var(--bg-secondary);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.header-controls {
    display: flex;
    gap: 0.5rem;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
    padding: 1rem;
    flex: 1;
    overflow: hidden;
}

/* Panels */
.panel {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.panel-controls {
    display: flex;
    gap: 0.5rem;
}

/* Code Editor */
.code-editor {
    flex: 1;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 1rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    resize: none;
    outline: none;
    line-height: 1.6;
}

.code-editor:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

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

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

.btn-primary:hover {
    background: #1d4ed8;
}

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

.btn-secondary:hover {
    background: #475569;
}

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

.btn-success:hover {
    background: #059669;
}

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

.btn-warning:hover {
    background: #d97706;
}

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

.btn-danger:hover {
    background: #dc2626;
}

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

.btn-info:hover {
    background: #2563eb;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.icon {
    font-size: 1rem;
}

/* Execution Controls */
.execution-controls {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

.control-group label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.control-group input[type="number"] {
    width: 80px;
    padding: 0.375rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.current-instruction {
    margin-left: auto;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
    font-size: 0.875rem;
}

.current-instruction strong {
    color: var(--text-secondary);
}

/* Registers */
.registers-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.registers-section h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.registers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.5rem;
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.register-item {
    display: flex;
    flex-direction: column;
    padding: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.register-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.register-item.modified {
    background: var(--register-modified);
    color: var(--bg-primary);
    border-color: var(--highlight-color);
}

.register-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.register-item.modified .register-name {
    color: var(--bg-primary);
}

.register-value {
    font-size: 0.875rem;
    font-weight: 500;
    font-family: 'Consolas', monospace;
}

/* Instruction Details */
.instruction-details {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.instruction-details h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.instruction-info {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: 4px;
    font-size: 0.875rem;
    line-height: 1.6;
    max-height: 200px;
    overflow-y: auto;
}

.instruction-info p {
    margin-bottom: 0.5rem;
}

.instruction-info strong {
    color: var(--text-secondary);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

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

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
    flex: 1;
    overflow-y: auto;
}

.tab-content.active {
    display: flex;
    flex-direction: column;
}

/* Tables */
.table-container {
    flex: 1;
    overflow-y: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}

.data-table thead {
    position: sticky;
    top: 0;
    background: var(--bg-tertiary);
    z-index: 10;
}

.data-table th {
    padding: 0.75rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border-color);
}

.data-table td {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr {
    transition: background 0.2s;
}

.data-table tbody tr:hover {
    background: var(--bg-tertiary);
}

.data-table tbody tr.selected {
    background: rgba(37, 99, 235, 0.2);
}

.data-table tbody tr.executing {
    background: rgba(251, 191, 36, 0.2);
}

.data-table tbody tr.executing td {
    font-weight: 600;
}

/* Output */
.output-container {
    flex: 1;
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: 4px;
    overflow-y: auto;
    font-family: 'Consolas', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.output-placeholder {
    color: var(--text-secondary);
    font-style: italic;
}

.output-line {
    margin-bottom: 0.25rem;
    padding: 0.25rem;
    border-radius: 2px;
}

.output-line.error {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

/* Modals */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-secondary);
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
}

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

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

.modal-body label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.modal-body input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

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

.modal-body ul {
    margin-left: 1.5rem;
    margin-top: 0.5rem;
}

.modal-body ul li {
    margin-bottom: 0.5rem;
}

.modal-body a {
    color: var(--primary-color);
    text-decoration: none;
}

.modal-body a:hover {
    text-decoration: underline;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

/* Save/Load Options */
.save-options, .load-options {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.save-option, .load-option {
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.save-option h4, .load-option h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.save-option p, .load-option p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.save-divider, .load-divider {
    text-align: center;
    color: var(--text-secondary);
    font-weight: 600;
    position: relative;
}

.save-divider::before, .load-divider::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    height: 1px;
    background: var(--border-color);
    z-index: 0;
}

.save-divider, .load-divider {
    background: var(--bg-secondary);
    padding: 0 1rem;
    z-index: 1;
    position: relative;
}

/* Projects List */
.projects-list {
    max-height: 300px;
    overflow-y: auto;
}

/* Samples List */
.samples-list {
    display: grid;
    gap: 0.75rem;
    max-height: 500px;
    overflow-y: auto;
}

.sample-item {
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.sample-item:hover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
    transform: translateY(-2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.sample-item-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    font-size: 1rem;
}

.sample-item-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.sample-item-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.sample-tag {
    padding: 0.125rem 0.5rem;
    background: var(--primary-color);
    color: white;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

.project-item {
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-item:hover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

.project-item-name {
    font-weight: 500;
}

.project-item-delete {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
}

.project-item-delete:hover {
    background: #dc2626;
}

/* Register Viewer */
.register-viewer {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.register-viewer-item {
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.register-viewer-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.register-viewer-value {
    font-size: 1rem;
    font-family: 'Consolas', monospace;
    font-weight: 600;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Responsive Design */
@media (max-width: 1400px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .debug-panel {
        grid-column: 1 / -1;
    }
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .registers-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}