:root {
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --accent: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --info: #06b6d4;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --radius: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background: radial-gradient(circle at top left, #1e1b4b, #0f172a);
    color: var(--text-main);
    min-height: 100vh;
    padding: 20px;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header */
.header-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 2px;
}

.mode-selector {
    display: flex;
    gap: 10px;
    background: rgba(15, 23, 42, 0.6);
    padding: 6px;
    border-radius: 10px;
    border: 1px solid var(--card-border);
}

.mode-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode-btn.active {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.metric-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.metric-label {
    font-size: 13px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-value {
    font-size: 26px;
    font-weight: 700;
}

.metric-sub {
    font-size: 12px;
}

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

/* Workspace Grid */
.workspace-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 900px) {
    .workspace-grid { grid-template-columns: 1fr; }
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.badge {
    background: rgba(59, 130, 246, 0.2);
    color: var(--primary);
    border: 1px solid rgba(59, 130, 246, 0.4);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-accent {
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent);
    border-color: rgba(139, 92, 246, 0.4);
}

/* Sample Queries */
.sample-queries {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.sample-label {
    font-size: 12px;
    color: var(--text-muted);
}

.chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    cursor: pointer;
    transition: background 0.2s;
}

.chip:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* Chat Box */
.chat-box {
    height: 380px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-right: 6px;
}

.message {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.msg-content {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--card-border);
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.5;
    white-space: pre-wrap;
}

.user-message {
    flex-direction: row-reverse;
}

.user-message .msg-content {
    background: var(--primary);
    border-color: var(--primary-hover);
}

/* Input Form */
.input-form {
    display: flex;
    gap: 10px;
}

#query-input {
    flex: 1;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--card-border);
    color: #fff;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
    outline: none;
}

#query-input:focus {
    border-color: var(--primary);
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border: none;
    color: #fff;
    padding: 12px 20px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.primary-btn:hover {
    opacity: 0.9;
}

/* Trace Panel */
.trace-summary {
    display: flex;
    justify-content: space-between;
    background: rgba(15, 23, 42, 0.6);
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--card-border);
    font-size: 13px;
}

.spans-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 280px;
    overflow-y: auto;
    margin-top: 8px;
}

.span-item {
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid var(--card-border);
    border-left: 4px solid var(--primary);
    padding: 10px 14px;
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
}

.span-item.PASS { border-left-color: var(--success); }
.span-item.FAIL { border-left-color: var(--warning); }
.span-item.CACHE_HIT { border-left-color: var(--info); }

.citations-container {
    margin-top: 12px;
    border-top: 1px solid var(--card-border);
    padding-top: 12px;
    font-size: 13px;
}

.citation-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    padding: 8px 12px;
    border-radius: 6px;
    margin-top: 6px;
}

.empty-state {
    color: var(--text-muted);
    font-size: 13px;
    text-align: center;
    padding: 30px;
}