/* Design System & Global Styles */
:root {
    --bg-base: #090d16;
    --bg-card: rgba(17, 25, 40, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(255, 255, 255, 0.15);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Branding gradients */
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --accent-primary: #6366f1;
    --accent-hover: #4f46e5;
    
    /* Semantic colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #06b6d4;

    /* Fonts */
    --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-code: 'Fira Code', source-code-pro, Menlo, Monaco, Consolas, "Courier New", monospace;
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-display);
    line-height: 1.5;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background Ambient Glows */
.glow-bg {
    position: fixed;
    top: -200px;
    left: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(168, 85, 247, 0.05) 50%, rgba(0, 0, 0, 0) 100%);
    z-index: -1;
    pointer-events: none;
    filter: blur(80px);
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: rgba(9, 13, 22, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-brand .icon {
    font-size: 2.2rem;
}

.header-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, #fff, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-brand .subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.header-db-pill {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    padding: 0.4rem 0.8rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-success);
}

.pulse-indicator {
    width: 8px;
    height: 8px;
    background-color: var(--color-success);
    border-radius: 50%;
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    animation: pulse 1.8s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    }
}

/* Layout */
.app-layout {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 2rem;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    gap: 2rem;
}

/* Telemetry Bar */
.telemetry-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    backdrop-filter: blur(8px);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.metric-card:hover {
    transform: translateY(-2px);
    border-color: var(--border-highlight);
}

.metric-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-code);
}

.metric-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Workspace Grid */
.workspace-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 1024px) {
    .workspace-grid {
        grid-template-columns: 450px 1fr;
    }
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    backdrop-filter: blur(12px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

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

/* Editor Section */
.preset-dropdown select {
    background-color: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-display);
    padding: 0.4rem 1.8rem 0.4rem 0.8rem;
    font-size: 0.8rem;
    border-radius: 8px;
    outline: none;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg fill='%2394a3b8' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'><path d='M7 10l5 5 5-5z'/><path d='M0 0h24v24H0z' fill='none'/></svg>");
    background-repeat: no-repeat;
    background-position: right 0.4rem top 50%;
    background-size: 1.2rem;
}

.preset-dropdown select:focus {
    border-color: var(--accent-primary);
}

.editor-container {
    flex: 1;
    min-height: 250px;
    position: relative;
}

#dsl-input {
    width: 100%;
    height: 100%;
    min-height: 250px;
    background: transparent;
    border: none;
    resize: none;
    padding: 1.5rem;
    color: var(--text-primary);
    font-family: var(--font-code);
    font-size: 0.95rem;
    outline: none;
    line-height: 1.6;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.9rem;
    font-family: var(--font-display);
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.btn-primary:hover {
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
    transform: translateY(-1px);
}

/* Tabs Section */
.tabs-header {
    border-bottom: 1px solid var(--border-color);
    background: rgba(9, 13, 22, 0.2);
}

.tabs-list {
    display: flex;
    overflow-x: auto;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 1.25rem 1.5rem;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

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

.tab-btn.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.03);
}

.tabs-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.tab-panel {
    display: none;
    flex-direction: column;
    gap: 1.25rem;
    animation: fadeIn 0.2s ease;
}

.tab-panel.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(2px); }
    to { opacity: 1; transform: translateY(0); }
}

.panel-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-left: 3px solid var(--accent-primary);
    padding-left: 0.75rem;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.toggle-container {
    display: flex;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.15rem;
}

.btn-toggle {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-display);
    transition: all 0.15s ease;
}

.btn-toggle.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

/* AST Visualizer Styles */
.ast-visualizer-container {
    background: rgba(10, 15, 30, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    min-height: 400px;
    padding: 1.5rem;
    overflow: auto;
    max-height: 600px;
}

.ast-tree-renderer {
    font-family: var(--font-code);
    font-size: 0.85rem;
}

.ast-node {
    margin-left: 1.5rem;
    border-left: 1px dashed rgba(255, 255, 255, 0.1);
    padding-left: 0.75rem;
    position: relative;
    margin-top: 0.4rem;
}

.ast-node::before {
    content: "";
    position: absolute;
    top: 0.6rem;
    left: 0;
    width: 8px;
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
}

.ast-node-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.02);
    width: fit-content;
}

.ast-node-type {
    color: var(--color-info);
    font-weight: 600;
}

.ast-node-val {
    color: #e2e8f0;
}

.ast-node-op {
    color: #a855f7;
    font-weight: 600;
}

.ast-node-prop {
    color: var(--text-muted);
}

/* Optimizer Pass Visualizer */
.optimizer-passes-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.pass-card {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.pass-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.25rem;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
}

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

.pass-badge {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
    text-transform: uppercase;
}

.pass-badge.applied {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.pass-badge.no_change {
    background: rgba(148, 163, 184, 0.1);
    color: var(--text-secondary);
    border: 1px solid rgba(148, 163, 184, 0.2);
}

.pass-badge.skipped {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.pass-diff-grid {
    display: grid;
    grid-template-columns: 1fr;
    border-top: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .pass-diff-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.diff-col {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.diff-col:first-child {
    border-right: 1px solid var(--border-color);
}

.diff-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
}

.diff-code {
    font-family: var(--font-code);
    font-size: 0.85rem;
    background: rgba(10, 15, 30, 0.8);
    padding: 0.75rem;
    border-radius: 6px;
    overflow-x: auto;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-break: break-all;
}

/* SQL Codegen View */
.code-container {
    position: relative;
    background: #060913;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
}

#generated-sql-code {
    font-family: var(--font-code);
    font-size: 0.95rem;
    color: #38bdf8;
    white-space: pre-wrap;
    line-height: 1.6;
}

.btn-copy {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    font-size: 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-copy:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

/* Advisor Box */
.advisor-box {
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: 12px;
    padding: 1.25rem;
    margin-top: 1rem;
}

.advisor-box.hidden {
    display: none;
}

.advisor-box h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #a5b4fc;
}

.advisor-box ul {
    list-style-type: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.advisor-box li {
    font-size: 0.8rem;
    color: var(--text-secondary);
    padding-left: 1.25rem;
    position: relative;
}

.advisor-box li::before {
    content: "•";
    color: var(--color-warning);
    position: absolute;
    left: 0;
    font-size: 1.2rem;
    line-height: 0.8rem;
}

/* Explain Table */
.explain-results {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.explain-metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.sub-metric {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sub-metric .label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.sub-metric .value {
    font-weight: 700;
    font-family: var(--font-code);
    color: var(--color-info);
}

.table-container {
    background: rgba(10, 15, 30, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.table-container h3 {
    font-size: 0.9rem;
    font-weight: 600;
    padding: 1rem 1.25rem;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

th, td {
    padding: 0.75rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    color: var(--text-secondary);
    font-weight: 600;
    background: rgba(255, 255, 255, 0.01);
}

tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

td.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.text-success {
    color: var(--color-success);
}

.text-warning {
    color: var(--color-warning);
}

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

/* Placeholders */
.placeholder-text {
    height: 100%;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
    padding: 2rem;
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border-color);
    background: rgba(9, 13, 22, 0.5);
    margin-top: auto;
}

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