:root {
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #2d2d2d;
    --bg-hover: #3e3e42;
    --bg-active: #094771;
    --text-primary: #cccccc;
    --text-secondary: #969696;
    --text-bright: #e0e0e0;
    --border-color: #3e3e42;
    --accent: #0078d4;
    --accent-hover: #1a8cff;
    --error-color: #f44747;
    --error-bg: rgba(244, 71, 71, 0.1);
    --warning-color: #cca700;
    --warning-bg: rgba(204, 167, 0, 0.1);
    --info-color: #3794ff;
    --success-color: #73c991;
    --gutter-bg: #1e1e1e;
    --line-highlight: #2a2d2e;
    --scrollbar-bg: #1e1e1e;
    --scrollbar-thumb: #424242;
    --panel-max-height: 200px;
    --toolbar-height: 44px;
    --statusbar-height: 24px;
    --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', 'Courier New', monospace;
    --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html, body {
    height: 100%;
    overflow: hidden;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 13px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Toolbar */
#toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--toolbar-height);
    padding: 0 12px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    gap: 12px;
    flex-shrink: 0;
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.toolbar-left .logo {
    font-size: 20px;
    line-height: 1;
}

.toolbar-left h1 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-bright);
    white-space: nowrap;
}

.toolbar-left .version {
    color: var(--accent);
    font-weight: 700;
}

#version-select {
    background: var(--accent);
    color: #fff;
    border: 1px solid var(--accent);
    border-radius: 4px;
    padding: 4px 26px 4px 8px;
    font-size: 12px;
    font-weight: 600;
    font-family: var(--font-ui);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23ffffff'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 6px center;
}

#version-select:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

#version-select:focus {
    outline: 1px solid #fff;
    outline-offset: -1px;
}

.toolbar-center {
    flex: 1;
    display: flex;
    justify-content: center;
    min-width: 0;
}

#template-select {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 5px 28px 5px 10px;
    font-size: 12px;
    font-family: var(--font-ui);
    cursor: pointer;
    min-width: 220px;
    max-width: 360px;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23969696'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}

#template-select:hover {
    border-color: var(--accent);
}

#template-select:focus {
    outline: 1px solid var(--accent);
    outline-offset: -1px;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.toolbar-right button {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 5px 14px;
    font-size: 12px;
    font-family: var(--font-ui);
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s, border-color 0.15s;
}

.toolbar-right button:hover {
    background: var(--bg-hover);
    border-color: var(--text-secondary);
}

#btn-validate {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    font-weight: 600;
}

#btn-validate:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

#btn-validate.validating {
    opacity: 0.7;
    cursor: wait;
}

/* Toolbar file button (RNG) */
.toolbar-file-btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 5px 14px;
    font-size: 12px;
    font-family: var(--font-ui);
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s, border-color 0.15s;
    display: inline-block;
    line-height: 1.4;
}

.toolbar-file-btn:hover {
    background: var(--bg-hover);
    border-color: var(--text-secondary);
}

#btn-preview {
    background: #2d5a27;
    border-color: #2d5a27;
    color: #fff;
}

#btn-preview:hover {
    background: #3a7a32;
    border-color: #3a7a32;
}

/* Editor */
#editor-wrapper {
    flex: 1;
    overflow: hidden;
    position: relative;
    display: flex;
}

#editor-container {
    height: 100%;
    flex: 1;
    min-width: 0;
}

/* Preview Panel */
#preview-panel {
    height: 100%;
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--border-color);
    background: #1a1a2e;
}

#preview-panel.hidden {
    display: none;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.preview-header button {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 16px;
    cursor: pointer;
    padding: 0 4px;
}

.preview-header button:hover {
    color: var(--text-bright);
}

.preview-body {
    overflow-y: auto;
    padding: 16px;
    flex: 1;
    font-size: 13px;
    color: #d4d4d4;
    line-height: 1.5;
}

/* Preview content styles */
.pv-container { max-width: 100%; }
.pv-header { margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border-color); }
.pv-header h2 { color: #7cc5ff; font-size: 18px; margin-bottom: 4px; display: inline; margin-right: 8px; }
.pv-section { margin-bottom: 16px; }
.pv-section h3 { font-size: 13px; color: #4ec9b0; margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.5px; }
.pv-table { width: 100%; border-collapse: collapse; margin-bottom: 8px; }
.pv-table td { padding: 3px 8px; font-size: 12px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.pv-label { color: #858585; white-space: nowrap; width: 120px; }
.pv-badge { display: inline-block; padding: 1px 6px; border-radius: 3px; font-size: 11px; font-family: var(--font-mono); }
.pv-badge.id { background: #264f78; color: #9cdcfe; }
.pv-badge.file { background: #2d5a27; color: #b5cea8; }
.pv-badge.ver { background: #5a3527; color: #ce9178; }
.pv-badge.ref { background: #4a2d5a; color: #c586c0; }
.pv-badge.level { background: #2d4a5a; color: #4ec9b0; }
.pv-badge.rule { background: #5a4a2d; color: #dcdcaa; }
.pv-badge.version { background: var(--accent); color: #fff; }
.pv-badge.ns { background: #333; color: #858585; font-size: 10px; }
.pv-bdo { margin-bottom: 8px; padding: 8px; background: rgba(255,255,255,0.03); border-radius: 4px; border-left: 3px solid #264f78; }
.pv-bdo-header { margin-bottom: 4px; }
.pv-au { margin-bottom: 8px; padding: 8px; background: rgba(255,255,255,0.02); border-radius: 4px; border-left: 3px solid #4ec9b0; }
.pv-au-header { display: flex; align-items: center; gap: 6px; margin-bottom: 4px; }
.pv-au-id { color: #858585; font-size: 11px; font-family: var(--font-mono); }
.pv-au-desc { color: #b0b0b0; font-size: 12px; margin-bottom: 4px; }
.pv-au-refs { margin-top: 4px; }
.pv-mgmt { margin-top: 4px; }
.pv-codes { list-style: none; padding: 0; }
.pv-codes li { font-size: 12px; padding: 2px 0; color: #b0b0b0; }
.pv-orgs { font-size: 12px; }
.pv-error { color: var(--error-color); padding: 16px; text-align: center; }

/* RNG indicator */
#rng-indicator {
    background: #5a3527;
    color: #ce9178;
    padding: 1px 8px;
    border-radius: 3px;
    font-size: 10px;
    font-weight: 600;
    cursor: pointer;
    margin-left: 8px;
}

#rng-indicator:hover {
    background: #7a4537;
}

.hidden { display: none !important; }

#editor-container .cm-editor {
    height: 100%;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
}

#editor-container .cm-editor.cm-focused {
    outline: none;
}

#editor-container .cm-scroller {
    overflow: auto;
}

#editor-container .cm-gutters {
    background: var(--gutter-bg);
    border-right: 1px solid var(--border-color);
    color: var(--text-secondary);
}

#editor-container .cm-activeLineGutter {
    background: var(--line-highlight);
    color: var(--text-primary);
}

#editor-container .cm-activeLine {
    background: var(--line-highlight);
}

/* Lint markers */
.cm-lint-marker-error {
    content: "";
}

.cm-lint-marker-error::after {
    content: "●";
    color: var(--error-color);
    font-size: 12px;
}

.cm-lint-marker-warning::after {
    content: "●";
    color: var(--warning-color);
    font-size: 12px;
}

/* Diagnostic tooltips */
.cm-diagnostic-error {
    border-left: 3px solid var(--error-color);
    background: var(--error-bg);
    color: var(--text-primary);
    padding: 4px 8px;
    font-size: 12px;
}

.cm-diagnostic-warning {
    border-left: 3px solid var(--warning-color);
    background: var(--warning-bg);
    color: var(--text-primary);
    padding: 4px 8px;
    font-size: 12px;
}

/* Autocomplete */
.cm-tooltip-autocomplete {
    background: var(--bg-secondary) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 4px;
}

.cm-tooltip-autocomplete ul li {
    color: var(--text-primary);
    padding: 2px 8px;
}

.cm-tooltip-autocomplete ul li[aria-selected] {
    background: var(--accent) !important;
    color: #fff;
}

/* Problems Panel */
#problems-panel {
    flex-shrink: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    max-height: var(--panel-max-height);
    display: flex;
    flex-direction: column;
    transition: max-height 0.2s ease;
}

#problems-panel.collapsed {
    max-height: 30px;
}

#problems-panel.collapsed .panel-body {
    display: none;
}

#problems-panel.collapsed #btn-toggle-panel {
    transform: rotate(180deg);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 12px;
    background: var(--bg-tertiary);
    cursor: pointer;
    user-select: none;
    flex-shrink: 0;
    min-height: 28px;
}

.panel-header:hover {
    background: var(--bg-hover);
}

.panel-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

#problem-count {
    color: var(--text-secondary);
    font-weight: 400;
}

#btn-toggle-panel {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 10px;
    padding: 2px 4px;
    transition: transform 0.2s;
}

.panel-body {
    overflow-y: auto;
    flex: 1;
    min-height: 0;
}

.problem-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 4px 12px;
    font-size: 12px;
    cursor: pointer;
    border-bottom: 1px solid var(--bg-primary);
    transition: background 0.1s;
}

.problem-item:hover {
    background: var(--bg-hover);
}

.problem-item:last-child {
    border-bottom: none;
}

.problem-icon {
    flex-shrink: 0;
    width: 16px;
    text-align: center;
    font-weight: 700;
    line-height: 1.5;
}

.problem-icon.error {
    color: var(--error-color);
}

.problem-icon.warning {
    color: var(--warning-color);
}

.problem-icon.info {
    color: var(--info-color);
}

.problem-location {
    color: var(--text-secondary);
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 70px;
}

.problem-message {
    color: var(--text-primary);
    word-break: break-word;
}

.no-problems {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    color: var(--success-color);
    font-size: 12px;
    gap: 6px;
}

/* Status Bar */
#status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--statusbar-height);
    padding: 0 12px;
    background: var(--accent);
    color: #fff;
    font-size: 11px;
    flex-shrink: 0;
}

#status-bar span {
    white-space: nowrap;
}

#validation-status {
    font-weight: 600;
}

#validation-status.error {
    color: #ffcdd2;
}

#validation-status.warning {
    color: #fff9c4;
}

#validation-status.success {
    color: #c8e6c9;
}

/* Layout */
body {
    display: flex;
    flex-direction: column;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Loading overlay */
#loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    gap: 16px;
}

#loading-overlay .spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

#loading-overlay p {
    color: var(--text-secondary);
    font-size: 13px;
}

/* Responsive */
@media (max-width: 640px) {
    #toolbar {
        flex-wrap: wrap;
        height: auto;
        padding: 8px;
        gap: 8px;
    }

    .toolbar-center {
        order: 3;
        flex-basis: 100%;
    }

    #template-select {
        width: 100%;
        max-width: none;
    }

    .toolbar-right button {
        padding: 5px 10px;
        font-size: 11px;
    }
}