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

/* === Variables === */
:root {
    --color-bg: #1e1e2e;
    --color-surface: #282a36;
    --color-surface-hover: #313345;
    --color-border: #44475a;
    --color-text: #f8f8f2;
    --color-text-muted: #6272a4;
    --color-primary: #8be9fd;
    --color-secondary: #bd93f9;
    --color-success: #50fa7b;
    --color-warning: #f1fa8c;
    --color-error: #ff5555;
    --color-info: #8be9fd;
    --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', monospace;
    --font-sans: 'Inter', 'Segoe UI', system-ui, sans-serif;
    --radius: 6px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    line-height: 1.6;
}

/* === Layout === */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* === Navbar === */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 1.5rem;
}

.navbar h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
}

.navbar nav a {
    color: var(--color-text-muted);
    text-decoration: none;
    margin-left: 1.5rem;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.navbar nav a:hover,
.navbar nav a.active {
    color: var(--color-primary);
}

/* === Auth Status (navbar right) === */
.auth-status {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: auto;
    padding-left: 1.5rem;
}

.auth-loading {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.auth-user {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.btn-login {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
    font-weight: 600;
}

.btn-login:hover:not(:disabled) {
    background: #a8f0ff;
}

.btn-logout {
    background: transparent;
    color: var(--color-text-muted);
    border-color: var(--color-border);
}

.btn-logout:hover:not(:disabled) {
    color: var(--color-error);
    border-color: var(--color-error);
}

/* === Fixture Selector === */
.fixture-selector {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1rem;
    margin-bottom: 1rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.fixture-selector .fixture-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.fixture-selector .fixture-select {
    flex: 1;
    min-width: 200px;
    padding: 0.35rem 0.5rem;
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    cursor: pointer;
}

.fixture-selector .fixture-select-narrow {
    flex: 0 0 auto;
    min-width: 120px;
    max-width: 180px;
}

.fixture-selector .fixture-select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.fixture-selector .btn-load {
    white-space: nowrap;
}

.fixture-selector .fixture-loading {
    font-size: 0.8rem;
    color: var(--color-primary);
}

.fixture-selector .fixture-error {
    font-size: 0.8rem;
    color: var(--color-error);
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* === Converter Layout === */
.converter-layout {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1rem;
    align-items: start;
    margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
    .converter-layout {
        grid-template-columns: 1fr;
    }
}

/* === Editor Panel === */
.editor-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.editor-panel .panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--color-border);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.editor-panel textarea {
    width: 100%;
    min-height: 350px;
    padding: 1rem;
    background: transparent;
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    border: none;
    outline: none;
    resize: vertical;
    line-height: 1.5;
}

.editor-panel textarea::placeholder {
    color: var(--color-text-muted);
}

.editor-panel textarea:read-only {
    color: var(--color-text-muted);
    cursor: default;
}

/* === Controls (center column) === */
.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding-top: 2rem;
}

/* === Response Controls === */
.response-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    border-top: 1px solid var(--color-border);
    padding-top: 0.75rem;
}

.validation-filters {
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.response-checkbox {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    cursor: pointer;
}

.response-checkbox input[type="checkbox"] {
    accent-color: var(--color-primary);
}

.response-controls .fixture-select {
    width: 100%;
    padding: 0.25rem 0.4rem;
    font-size: 0.75rem;
}

/* === Response Panel Content === */
.response-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.response-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.response-format-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.response-textarea {
    width: 100%;
    min-height: 200px;
    padding: 0.75rem;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    resize: vertical;
    line-height: 1.5;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
    font-weight: 600;
}

.btn-primary:hover:not(:disabled) {
    background: #a8f0ff;
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--color-text-muted);
}

.btn-small {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
}

/* === Direction Toggle === */
.direction-toggle {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.direction-toggle .label {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    text-align: center;
}

/* === Collapsible Panel === */
.collapsible-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.collapsible-panel .panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 1rem;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
}

.collapsible-panel .panel-header:hover {
    background: var(--color-surface-hover);
}

.collapsible-panel .panel-header .title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.collapsible-panel .panel-header .badge {
    display: inline-flex;
    align-items: center;
    padding: 0.1rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    background: var(--color-border);
    color: var(--color-text-muted);
}

.collapsible-panel .panel-header .chevron {
    transition: transform 0.2s;
    color: var(--color-text-muted);
}

.collapsible-panel.open .panel-header .chevron {
    transform: rotate(90deg);
}

.collapsible-panel .panel-body {
    display: none;
    padding: 1rem;
    border-top: 1px solid var(--color-border);
}

.collapsible-panel.open .panel-body {
    display: block;
}

/* === Segment Tree === */
.segment-tree {
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.segment-tree .tree-node {
    padding: 0.25rem 0;
}

.segment-tree .tree-node .node-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    cursor: default;
}

.segment-tree .tree-node .node-row:hover {
    background: var(--color-surface-hover);
}

.segment-tree .tag-badge {
    display: inline-flex;
    padding: 0.1rem 0.4rem;
    background: var(--color-primary);
    color: var(--color-bg);
    border-radius: 3px;
    font-weight: 600;
    font-size: 0.75rem;
}

.segment-tree .line-number {
    color: var(--color-text-muted);
    font-size: 0.7rem;
    min-width: 3rem;
}

.segment-tree .raw-content {
    color: var(--color-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 500px;
}

.segment-tree .children {
    padding-left: 1.5rem;
    border-left: 1px solid var(--color-border);
    margin-left: 0.75rem;
}

/* === Trace Table === */
.trace-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

.trace-table th {
    text-align: left;
    padding: 0.5rem;
    border-bottom: 2px solid var(--color-border);
    color: var(--color-text-muted);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.trace-table td {
    padding: 0.4rem 0.5rem;
    border-bottom: 1px solid var(--color-border);
    font-family: var(--font-mono);
}

.trace-table tr:hover td {
    background: var(--color-surface-hover);
}

.trace-table .value-cell {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.trace-table .note-cell {
    color: var(--color-text-muted);
    font-family: var(--font-sans);
    font-style: italic;
}

/* === Error List === */
.error-list {
    list-style: none;
}

.error-list .error-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

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

.error-list .severity-icon {
    flex-shrink: 0;
    width: 1.25rem;
    height: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.7rem;
    font-weight: 700;
}

.error-list .severity-icon.warning {
    background: var(--color-warning);
    color: var(--color-bg);
}

.error-list .severity-icon.error {
    background: var(--color-error);
    color: white;
}

.error-list .severity-icon.critical {
    background: var(--color-error);
    color: white;
}

.error-list .severity-icon.info {
    background: var(--color-info);
    color: var(--color-bg);
}

.error-list .error-code {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.85rem;
}

.error-list .error-message {
    font-size: 0.85rem;
}

.error-list .error-location {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.no-errors {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: rgba(80, 250, 123, 0.1);
    border: 1px solid rgba(80, 250, 123, 0.3);
    border-radius: var(--radius);
    color: var(--color-success);
    font-size: 0.85rem;
}

/* === Coordinator Cards === */
.coordinator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.coordinator-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    transition: border-color 0.2s;
}

.coordinator-card:hover {
    border-color: var(--color-primary);
}

.coordinator-card h3 {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.coordinator-card .description {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

.coordinator-card .versions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.coordinator-card .version-badge {
    display: inline-flex;
    padding: 0.15rem 0.5rem;
    background: var(--color-secondary);
    color: var(--color-bg);
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* === Loading / Status === */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: var(--color-text-muted);
}

.loading .spinner {
    width: 1.5rem;
    height: 1.5rem;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 0.75rem;
}

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