:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --field-col-size: 60px;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #94a3b8;
    --secondary-hover: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --border-color: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.header-main h1 {
    font-size: 28px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 16px;
}

main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    min-height: 600px;
}

@media (min-width: 1024px) {
    main {
        grid-template-columns: 400px 1fr;
    }
}

/* =========================================
   Editor Pane (Left)
   ========================================= */

.editor-pane {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    background: var(--surface-color);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.toolbar label {
    font-weight: 500;
    font-size: 14px;
    color: var(--text-secondary);
}

#targetSelect {
    flex: 1;
    min-width: 150px;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--background-color);
    color: var(--text-primary);
}

.target-custom {
    flex: 1 1 100%;
}

.target-custom input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--background-color);
    color: var(--text-primary);
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.primary-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.spinner {
    font-size: 12px;
    color: var(--primary-color);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}

.editor-wrapper {
    flex: 1;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    background: var(--surface-color);
    min-height: 400px;
}

#codeEditor {
    width: 100%;
    height: 100%;
    border: none;
    padding: 16px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    background: var(--surface-color);
    color: var(--text-primary);
    resize: none;
    outline: none;
}

.error-banner {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: var(--error-color);
    padding: 12px;
    border-radius: 8px;
    font-size: 14px;
    white-space: pre-wrap;
    font-family: monospace;
}

/* =========================================
   Results Pane (Right)
   ========================================= */

.results-pane {
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    min-height: 500px;
}


.record-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.record-status {
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.record-items {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: -4px;
    margin-right: -4px;
    padding-bottom: 4px;
}

.record-item {
    font-size: 13px;
    padding: 6px 12px 6px 28px;
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.record-item:hover {
    background: #e0f2fe;
    border-color: var(--primary-color);
}

.record-item.selected {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.record-item.selected::before {
    content: '\2713';
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-weight: 700;
    font-size: 13px;
}

.record-item.control {
    background: #e2e8f0;
    border-color: #cbd5e1;
}

.record-item.control.selected {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.empty-selection {
    padding: 16px;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    background: var(--surface-color);
}

.visualization-container {
    flex: 1;
    overflow-y: auto;
    padding-right: 8px;
}

/* =========================================
   Visualization Components (Generated)
   ========================================= */

.record-box {
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
    background: var(--surface-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.record-header {
    background: var(--primary-color);
    color: white;
    padding: 10px 16px;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    font-size: 14px;
}

.memory-bar {
    background: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    padding: 16px;
    display: grid;
    grid-template-columns: repeat(8, 14px);
    grid-auto-rows: 14px;
    column-gap: 2px;
    row-gap: 2px;
}

.memory-segment {
    width: 14px;
    height: 14px;
    border-radius: 2px;
    cursor: pointer;
    transition: transform 0.1s;
}

.memory-segment:hover,
.memory-segment.highlight {
    transform: scale(1.12);
    z-index: 10;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.memory-segment.simple { background: var(--success-color); }
.memory-segment.record { background: var(--primary-color); }
.memory-segment.vptr { background: #8b5cf6; }
.memory-segment.base { background: var(--warning-color); }
.memory-segment.padding { background: #cbd5e1; }

.field-header {
    display: grid;
    grid-template-columns: 1fr 60px 60px 60px;
    padding: 8px 16px;
    background: var(--background-color);
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-color);
}

.field {
    display: grid;
    grid-template-columns: 1fr 60px 60px 60px;
    padding: 8px 16px;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    font-size: 13px;
    transition: background 0.1s;
}

.field:last-child {
    border-bottom: none;
}

.field:hover, .field.highlight {
    background: #f1f5f9;
}

.field-info {
    overflow: hidden;
}

.field-name {
    font-weight: 600;
    color: var(--text-primary);
}

.field-type {
    font-size: 11px;
    color: var(--text-secondary);
    font-family: monospace;
}

.field-size,
.field-align {
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
}

.field-offset {
    background: #e2e8f0;
    color: var(--text-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    text-align: center;
    width: fit-content;
    justify-self: center;
}

.field.vptr-field { border-left: 4px solid #8b5cf6; }
.field.base-field { border-left: 4px solid var(--warning-color); }
.field.simple-field { border-left: 4px solid var(--success-color); }
.field.record-field { border-left: 4px solid var(--primary-color); }

/* =========================================
   Info Panel & Footer
   ========================================= */

.info-panel {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: auto;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    border-radius: 8px;
    z-index: 100;
    overflow: hidden;
}

.info-header {
    background: var(--background-color);
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.info-header h3 {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.icon-btn {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-secondary);
}

#infoContent {
    padding: 12px;
    font-size: 12px;
    max-height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
}

footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.site-footer a {
    color: var(--primary-color);
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}