/* ============================================================
   QueryPerfAnalyzer -- Clean technical theme
   ============================================================ */

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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-hover: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --border-color: #30363d;
    --border-light: #21262d;
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-yellow: #d29922;
    --accent-orange: #db6d28;
    --accent-red: #f85149;
    --accent-purple: #bc8cff;
    --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --radius: 6px;
    --radius-lg: 10px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.4);
    --transition: 0.2s ease;
}

html {
    font-size: 15px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ---- Top Bar ---- */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    height: 56px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--accent-blue);
}

.logo h1 {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.3px;
}

.main-nav {
    display: flex;
    gap: 0.25rem;
}

.nav-btn {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    cursor: pointer;
    border-radius: var(--radius);
    transition: background var(--transition), color var(--transition);
}

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

.nav-btn.active {
    background: var(--bg-tertiary);
    color: var(--accent-blue);
    font-weight: 500;
}

/* ---- Main Layout ---- */
main {
    flex: 1;
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.view {
    display: block;
}

.view.hidden {
    display: none;
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    font-weight: 500;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent-blue);
    color: #fff;
    border-color: var(--accent-blue);
}

.btn-primary:hover {
    background: #4c95e8;
    border-color: #4c95e8;
}

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

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

.btn-danger {
    background: transparent;
    color: var(--accent-red);
    border-color: var(--accent-red);
}

.btn-danger:hover {
    background: rgba(248, 81, 73, 0.15);
}

/* ---- Analyze View ---- */
.analyze-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.editor-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.panel-header h2 {
    font-size: 0.95rem;
    font-weight: 600;
}

.editor-actions {
    display: flex;
    gap: 0.5rem;
}

.editor-wrapper {
    display: flex;
    position: relative;
    min-height: 200px;
    max-height: 400px;
}

.line-numbers {
    width: 48px;
    padding: 0.75rem 0.5rem;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.6;
    text-align: right;
    user-select: none;
    overflow: hidden;
    border-right: 1px solid var(--border-color);
}

#sql-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.6;
    border: none;
    outline: none;
    resize: vertical;
    min-height: 200px;
    max-height: 400px;
    tab-size: 2;
    white-space: pre;
    overflow-wrap: normal;
    overflow-x: auto;
}

#sql-input::placeholder {
    color: var(--text-muted);
}

/* ---- Results Panel ---- */
.results-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.results-panel.hidden {
    display: none;
}

.score-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.score-circle {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--accent-green);
    flex-shrink: 0;
}

.score-circle.grade-a { border-color: var(--accent-green); }
.score-circle.grade-b { border-color: var(--accent-blue); }
.score-circle.grade-c { border-color: var(--accent-yellow); }
.score-circle.grade-d { border-color: var(--accent-orange); }
.score-circle.grade-f { border-color: var(--accent-red); }

.score-value {
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1;
}

.score-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.score-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.grade-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 700;
    background: var(--bg-hover);
    color: var(--accent-green);
}

.grade-badge.grade-a { color: var(--accent-green); }
.grade-badge.grade-b { color: var(--accent-blue); }
.grade-badge.grade-c { color: var(--accent-yellow); }
.grade-badge.grade-d { color: var(--accent-orange); }
.grade-badge.grade-f { color: var(--accent-red); }

.assessment {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ---- Tabs ---- */
.result-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    padding: 0 1rem;
    background: var(--bg-secondary);
}

.tab-btn {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    border-bottom: 2px solid transparent;
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition);
}

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

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

.tab-content {
    padding: 1rem;
}

.tab-content.hidden {
    display: none;
}

/* ---- Findings ---- */
.findings-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.finding-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1rem;
    border-left: 3px solid var(--accent-yellow);
}

.finding-card.severity-critical {
    border-left-color: var(--accent-red);
}

.finding-card.severity-warning {
    border-left-color: var(--accent-yellow);
}

.finding-card.severity-info {
    border-left-color: var(--accent-blue);
}

.finding-card.severity-suggestion {
    border-left-color: var(--accent-purple);
}

.finding-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.finding-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.finding-severity {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    background: var(--bg-hover);
}

.finding-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.finding-fix {
    background: var(--bg-primary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-green);
}

.finding-penalty {
    font-size: 0.8rem;
    color: var(--accent-red);
    font-weight: 500;
}

/* ---- EXPLAIN Output ---- */
.explain-output {
    overflow-x: auto;
}

.explain-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.explain-table th,
.explain-table td {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.explain-table th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.explain-table tr:hover td {
    background: var(--bg-hover);
}

.explain-table .cost-high {
    color: var(--accent-red);
    font-weight: 600;
}

.explain-table .cost-medium {
    color: var(--accent-yellow);
}

.explain-table .cost-low {
    color: var(--accent-green);
}

/* ---- Tips ---- */
.tips-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.tip-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1rem;
}

.tip-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.tip-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-blue);
}

.tip-impact {
    font-size: 0.75rem;
    text-transform: uppercase;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    background: var(--bg-hover);
}

.tip-impact.high { color: var(--accent-red); }
.tip-impact.medium { color: var(--accent-yellow); }
.tip-impact.low { color: var(--accent-green); }

.tip-explanation {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.tip-rewrite {
    background: var(--bg-primary);
    padding: 0.75rem;
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-primary);
    white-space: pre-wrap;
    overflow-x: auto;
    margin-top: 0.5rem;
    border: 1px solid var(--border-color);
}

.tip-index {
    background: var(--bg-primary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-purple);
    margin-top: 0.5rem;
    border: 1px solid var(--border-color);
}

/* ---- Dashboard ---- */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-blue);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.dashboard-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.chart-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
}

.chart-panel h3 {
    font-size: 0.95rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.bar-chart {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bar-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.bar-label {
    width: 160px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: right;
    flex-shrink: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.bar-track {
    flex: 1;
    height: 22px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.bar-fill {
    height: 100%;
    background: var(--accent-blue);
    border-radius: 3px;
    transition: width 0.5s ease;
    min-width: 2px;
}

.bar-value {
    width: 40px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: left;
}

/* ---- Recent Analyses ---- */
.recent-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
}

.recent-panel h3 {
    font-size: 0.95rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.recent-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.recent-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: background var(--transition);
}

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

.recent-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.recent-type {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-purple);
    background: var(--bg-primary);
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
}

.recent-score {
    font-weight: 600;
    font-size: 0.9rem;
}

.recent-time {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ---- History ---- */
.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.history-header h2 {
    font-size: 1.1rem;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.history-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1rem;
    cursor: pointer;
    transition: background var(--transition);
}

.history-card:hover {
    background: var(--bg-tertiary);
}

.history-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.history-sql {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--text-secondary);
    background: var(--bg-primary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}

.history-stats {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ---- Pagination ---- */
.pagination {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.page-btn {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.75rem;
    font-size: 0.82rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.page-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.page-btn.active {
    background: var(--accent-blue);
    color: #fff;
    border-color: var(--accent-blue);
}

.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ---- Footer ---- */
.footer {
    text-align: center;
    padding: 1rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border-color);
}

/* ---- Loading ---- */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ---- Empty State ---- */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-state p {
    font-size: 0.9rem;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .top-bar {
        flex-direction: column;
        height: auto;
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }

    .dashboard-panels {
        grid-template-columns: 1fr;
    }

    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .score-header {
        flex-direction: column;
        text-align: center;
    }

    .editor-actions {
        flex-wrap: wrap;
    }

    .bar-label {
        width: 100px;
    }
}

/* ---- Utility ---- */
.hidden {
    display: none !important;
}

.text-red { color: var(--accent-red); }
.text-yellow { color: var(--accent-yellow); }
.text-green { color: var(--accent-green); }
.text-blue { color: var(--accent-blue); }
.text-purple { color: var(--accent-purple); }