/* ============================================================
   FEC Campaign Finance AI Agent — Modern UI
   ============================================================ */

/* ── CSS Custom Properties (Light Mode) ───────────────────── */
:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-subtle: #eff6ff;
    --accent: #8b5cf6;

    --bg: #fafafa;
    --bg-secondary: #f3f4f6;
    --surface: #ffffff;
    --surface-elevated: #ffffff;

    --text: #0f172a;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;

    --border: #e2e8f0;
    --border-subtle: #f1f5f9;

    --success: #10b981;
    --success-bg: #ecfdf5;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --error: #ef4444;
    --error-bg: #fef2f2;

    --code-bg: #1e293b;
    --code-text: #e2e8f0;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);

    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

    --max-width: 820px;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
}

/* ── Dark Mode ────────────────────────────────────────────── */
[data-theme="dark"] {
    --primary: #60a5fa;
    --primary-hover: #93bbfd;
    --primary-subtle: #1e293b;
    --accent: #a78bfa;

    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --surface: #1e293b;
    --surface-elevated: #334155;

    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;

    --border: #334155;
    --border-subtle: #1e293b;

    --success: #34d399;
    --success-bg: #064e3b;
    --warning: #fbbf24;
    --warning-bg: #451a03;
    --error: #f87171;
    --error-bg: #450a0a;

    --code-bg: #0f172a;
    --code-text: #e2e8f0;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.5);
}

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

html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: background var(--transition), color var(--transition);
}

/* ── App Layout (main + side panel) ───────────────────────── */
.app-layout {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* ── Header ───────────────────────────────────────────────── */
header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
    z-index: 100;
    transition: background var(--transition), border-color var(--transition);
}

.logo {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.logo svg {
    width: 28px;
    height: 28px;
}

header h1 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.01em;
    white-space: nowrap;
}

.header-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 4px;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

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

.icon-btn svg {
    width: 18px;
    height: 18px;
}

/* ── Chat Container ───────────────────────────────────────── */
.chat-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

.chat-scroll::-webkit-scrollbar { width: 6px; }
.chat-scroll::-webkit-scrollbar-track { background: transparent; }
.chat-scroll::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}
.chat-scroll::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

.chat-container {
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    padding: 24px 24px 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* ── Welcome Screen ───────────────────────────────────────── */
.chat-scroll { display: flex; flex-direction: column; }

.welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-height: 0;
    padding: 0 20px 24px;
    animation: fadeUp 0.5s ease;
}

.welcome h2 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
    color: var(--text);
}

.welcome .subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.5;
    margin-bottom: 20px;
}

/* ── Suggestion Grid ───────────────────────────────────────── */
.suggestion-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    width: 100%;
    max-width: 640px;
}

.suggestion-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 14px 16px;
    opacity: 0;
    animation: pillIn 0.4s ease forwards;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.suggestion-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
}

.suggestion-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.suggestion-icon { font-size: 16px; }

.suggestion-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.01em;
}

.suggestion-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.suggestion-item {
    font-size: 12.5px;
    color: var(--text-secondary);
    padding: 5px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    line-height: 1.4;
}

.suggestion-item:hover {
    background: var(--bg-secondary);
    color: var(--primary);
}

@keyframes pillIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Messages ─────────────────────────────────────────────── */
.message {
    animation: fadeUp 0.3s ease;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* User message — right-aligned bubble */
.message.user {
    display: flex;
    justify-content: flex-end;
}

.message.user .msg-bubble {
    max-width: 70%;
    padding: 10px 16px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-lg) var(--radius-lg) 4px var(--radius-lg);
    font-size: 14px;
    line-height: 1.6;
    word-wrap: break-word;
}

/* Agent message — full-width, no bubble */
.message.agent {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.message.agent .msg-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    display: flex;
    align-items: center;
    gap: 6px;
}

.msg-label-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
}

.message.agent .msg-body {
    font-size: 14px;
    line-height: 1.75;
    color: var(--text);
}

/* Markdown content styles */
.msg-body h1, .msg-body h2, .msg-body h3 { margin: 16px 0 8px; font-weight: 600; }
.msg-body h1 { font-size: 20px; }
.msg-body h2 { font-size: 17px; }
.msg-body h3 { font-size: 15px; }
.msg-body p { margin: 6px 0; }
.msg-body ul, .msg-body ol { padding-left: 20px; margin: 6px 0; }
.msg-body li { margin: 3px 0; }

.msg-body strong { font-weight: 600; }

.msg-body code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: var(--font-mono);
}

.msg-body pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 16px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 12px 0;
    font-size: 13px;
    line-height: 1.6;
}

.msg-body pre code {
    background: none;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

/* Tables */
.msg-body table {
    border-collapse: collapse;
    width: 100%;
    margin: 12px 0;
    font-size: 13px;
    border-radius: var(--radius);
    overflow: hidden;
}

.msg-body table th,
.msg-body table td {
    padding: 10px 14px;
    border: 1px solid var(--border);
    text-align: left;
}

.msg-body table th {
    background: var(--bg-secondary);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-secondary);
}

.msg-body table tr:hover td {
    background: var(--primary-subtle);
}

/* Agent message — copy button */
.msg-actions {
    display: flex;
    gap: 4px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity var(--transition);
}

.message.agent:hover .msg-actions { opacity: 1; }

.msg-action-btn {
    border: none;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    font-family: var(--font-sans);
    transition: all var(--transition);
}

.msg-action-btn:hover {
    background: var(--border);
    color: var(--text);
}

.msg-action-btn svg { width: 13px; height: 13px; }

/* ── Thinking / Reasoning ─────────────────────────────────── */
.thinking {
    animation: fadeUp 0.3s ease;
}

.thinking-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    font-size: 13px;
    color: var(--text-secondary);
}

.thinking-progress {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    flex-shrink: 0;
}

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

.thinking-bar .status-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.thinking-bar .step-count {
    font-size: 12px;
    color: var(--text-tertiary);
    white-space: nowrap;
}

/* Completed thinking — collapse to a single chip */
.thinking.done .thinking-bar {
    display: none;
}

.thinking.done .thinking-progress {
    animation: none;
    border-color: var(--success);
    background: var(--success);
    position: relative;
}

.thinking.done .thinking-progress::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 5px;
    width: 4px;
    height: 7px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Reasoning toggle chip (compact, shown after done) */
.reasoning-toggle.chip {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 11px;
    color: var(--text-tertiary);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 3px 10px 3px 8px;
    background: var(--bg-secondary);
    margin-top: 4px;
    transition: border-color var(--transition), color var(--transition);
}
.reasoning-toggle.chip:hover {
    border-color: var(--primary);
    color: var(--primary);
}
.reasoning-toggle.chip svg { width: 11px; height: 11px; }

/* Reasoning trace (expandable) */
.reasoning-toggle {
    border: none;
    background: none;
    color: var(--text-tertiary);
    font-size: 12px;
    cursor: pointer;
    padding: 4px 0;
    font-family: var(--font-sans);
    display: flex;
    align-items: center;
    gap: 4px;
    transition: color var(--transition);
}

.reasoning-toggle:hover { color: var(--text-secondary); }
.reasoning-toggle svg { width: 12px; height: 12px; transition: transform var(--transition); }
.reasoning-toggle.open svg { transform: rotate(90deg); }

.reasoning-trace {
    display: none;
    padding: 12px 0 4px;
    flex-direction: column;
    gap: 6px;
}

.reasoning-trace.open { display: flex; }

.tool-step {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 13px;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.tool-step-icon {
    font-size: 14px;
    flex-shrink: 0;
    width: 20px;
    text-align: center;
}

.tool-step-name {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--primary);
    white-space: nowrap;
}

.tool-step-args {
    font-size: 12px;
    color: var(--text-secondary);
    word-break: break-word;
    flex: 1;
}

/* SQL in reasoning */
.sql-block {
    background: var(--code-bg);
    color: var(--code-text);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-family: var(--font-mono);
    font-size: 12px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
    margin-top: 4px;
    line-height: 1.6;
}

/* SQL syntax highlighting */
.sql-block .keyword { color: #c084fc; font-weight: 600; }
.sql-block .function { color: #67e8f9; }
.sql-block .string { color: #86efac; }
.sql-block .number { color: #fbbf24; }
.sql-block .comment { color: #64748b; font-style: italic; }

/* ── Chart Container ──────────────────────────────────────── */
.chart-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    animation: fadeUp 0.4s ease;
    margin: 8px 0;
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.chart-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.chart-header-left svg { width: 16px; height: 16px; color: var(--primary); }

.chart-actions {
    display: flex;
    gap: 4px;
}

.chart-plot {
    width: 100%;
    min-height: 360px;
    padding: 8px;
}

.chart-insight {
    padding: 12px 16px;
    border-top: 1px solid var(--border-subtle);
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.5;
}

/* ── Research Card ────────────────────────────────────────── */
.research-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin: 8px 0;
    animation: fadeUp 0.3s ease;
    background: var(--surface);
}

.research-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--bg-secondary);
    cursor: pointer;
    transition: background var(--transition);
    user-select: none;
}

.research-header:hover { background: var(--border-subtle); }

.research-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.research-chevron {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    transition: transform var(--transition);
}

.research-card.open .research-chevron { transform: rotate(180deg); }

.research-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.research-card.open .research-body {
    max-height: 2000px;
}

.research-body-inner {
    padding: 16px;
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.research-body-inner p { margin: 4px 0; }
.research-body-inner strong { color: var(--text); }

/* ── Input Area ───────────────────────────────────────────── */
.input-area {
    flex-shrink: 0;
    padding: 16px 24px 20px;
    background: var(--bg);
    transition: background var(--transition);
}

/* ── Welcome State: center welcome + input as a group ─────── */
body.welcome-state .chat-scroll {
    flex: none;              /* don't expand to fill space */
    overflow: visible;
    margin-top: auto;        /* push down from header */
}

body.welcome-state .chat-container {
    padding-bottom: 0;
}

body.welcome-state .welcome {
    padding-bottom: 8px;
}

body.welcome-state .input-area {
    margin-bottom: auto;     /* push up from bottom — centers the pair */
    padding-top: 0;
    padding-bottom: 0;
    max-width: calc(var(--max-width) + 48px);
    margin-left: auto;
    margin-right: auto;
    width: 100%;
}

/* ── How It Works Side Panel ─────────────────────────────── */
.how-it-works {
    width: 0;
    overflow: hidden;
    border-left: 0 solid var(--border);
    background: var(--surface);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                border-left-width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.how-it-works.resizing {
    transition: none;
    user-select: none;
}

.hiw-resize-handle {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    cursor: col-resize;
    z-index: 10;
    background: transparent;
    transition: background 0.2s;
}

.hiw-resize-handle:hover,
.hiw-resize-handle.dragging {
    background: var(--primary);
    opacity: 0.4;
}

.how-it-works.open {
    width: 380px;
    border-left-width: 1px;
}

.how-it-works.open.expanded {
    width: 56vw;
    min-width: 500px;
    max-width: 900px;
}

/* ── Live Flow Diagram ─────────────────────────────────── */
.live-flow {
    padding: 12px 16px 14px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    background: var(--surface);
}

.lf-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.lf-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-tertiary);
    flex-shrink: 0;
    transition: background 0.3s;
}

.lf-dot.recording {
    background: #ef4444;
    animation: lfPulse 1.4s ease-in-out infinite;
}

.lf-dot.done {
    background: #22c55e;
    animation: none;
}

@keyframes lfPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.lf-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
}

.lf-status {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-left: auto;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 180px;
}

.lf-diagram {
    display: flex;
    flex-direction: column;
}

/* Main flow nodes */
.lf-node {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 6px;
    border-left: 3px solid transparent;
    opacity: 0.3;
    transition: all 0.35s ease;
    position: relative;
}

.lf-node.active {
    opacity: 1;
    border-left-color: var(--primary);
    background: rgba(59, 130, 246, 0.08);
}

.lf-node.completed {
    opacity: 0.85;
    border-left-color: #22c55e;
}

/* Active pulsing dot */
.lf-node.active::after {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
    margin-left: auto;
    flex-shrink: 0;
    animation: lfNodePulse 1.2s ease-in-out infinite;
}

@keyframes lfNodePulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.6); }
}

/* Completed checkmark */
.lf-node.completed::after {
    content: '\2713';
    font-size: 10px;
    font-weight: 700;
    color: #22c55e;
    margin-left: auto;
    flex-shrink: 0;
}

.lf-ico {
    font-size: 13px;
    width: 18px;
    text-align: center;
    flex-shrink: 0;
}

.lf-txt {
    font-size: 12px;
    color: var(--text-secondary);
    transition: color 0.3s, font-weight 0.3s;
}

.lf-node.active .lf-txt {
    color: var(--primary);
    font-weight: 600;
}

.lf-node.completed .lf-txt {
    color: var(--text);
}

.lf-mcp {
    font-size: 8px;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 99px;
    background: #7c3aed;
    color: #fff;
    letter-spacing: 0.5px;
    margin-left: auto;
    flex-shrink: 0;
}

/* Wire connectors */
.lf-wire {
    width: 2px;
    height: 4px;
    background: var(--border);
    margin-left: 18px;
    transition: background 0.3s;
}

.lf-node.completed + .lf-wire {
    background: #22c55e;
}

/* Group boxes (tools / sub-agents) */
.lf-group {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 6px 8px;
    margin: 2px 0;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.lf-group.has-active {
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.08);
}

.lf-group.has-completed {
    border-color: #22c55e;
}

.lf-ghdr {
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    margin-bottom: 4px;
    padding: 0 2px;
}

.lf-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3px;
}

.lf-tool {
    padding: 3px 8px;
    border-left-width: 2px;
    font-size: 11px;
}

.lf-tool .lf-ico {
    font-size: 11px;
    width: 16px;
}

.lf-tool .lf-txt {
    font-size: 11px;
}

.hiw-header {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.hiw-header h3 {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -0.01em;
    white-space: nowrap;
}

.hiw-header-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

.hiw-expand { width: 28px; height: 28px; }
.hiw-expand svg { width: 14px; height: 14px; }
.hiw-close { width: 28px; height: 28px; }
.hiw-close svg { width: 14px; height: 14px; }

/* Expanded panel: two-column scroll content */
.how-it-works.expanded .hiw-scroll {
    columns: 2;
    column-gap: 28px;
}

.how-it-works.expanded .hiw-section {
    break-inside: avoid;
}

.how-it-works.expanded .hiw-intro {
    column-span: all;
}

.hiw-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.hiw-scroll::-webkit-scrollbar { width: 4px; }
.hiw-scroll::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.hiw-intro {
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.hiw-intro strong { color: var(--text); }

.hiw-section {
    margin-bottom: 24px;
}

.hiw-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

/* Flow Steps */
.hiw-flow {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.hiw-step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.hiw-step:hover { background: var(--bg-secondary); }

.hiw-step-icon {
    font-size: 18px;
    flex-shrink: 0;
    width: 28px;
    text-align: center;
    line-height: 1.4;
}

.hiw-step-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
}

.hiw-step-desc {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.hiw-connector {
    width: 2px;
    height: 12px;
    background: var(--border);
    margin-left: 25px;
    border-radius: 1px;
}

/* Component Cards */
.hiw-components {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.hiw-component {
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.hiw-component:hover {
    border-color: var(--primary-light, var(--border));
    box-shadow: var(--shadow-sm);
}

.hiw-comp-badge {
    display: inline-block;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    margin-bottom: 6px;
}

.hiw-comp-badge.brain       { background: #eff6ff; color: #2563eb; }
.hiw-comp-badge.tools       { background: #f0fdf4; color: #16a34a; }
.hiw-comp-badge.knowledge   { background: #fefce8; color: #ca8a04; }
.hiw-comp-badge.guardrails  { background: #fef2f2; color: #dc2626; }
.hiw-comp-badge.memory      { background: #faf5ff; color: #9333ea; }
.hiw-comp-badge.orchestrator { background: #f0fdfa; color: #0d9488; }

[data-theme="dark"] .hiw-comp-badge.brain       { background: #1e3a5f; color: #93bbfd; }
[data-theme="dark"] .hiw-comp-badge.tools       { background: #14332a; color: #6ee7b7; }
[data-theme="dark"] .hiw-comp-badge.knowledge   { background: #3b2f10; color: #fbbf24; }
[data-theme="dark"] .hiw-comp-badge.guardrails  { background: #3b1212; color: #fca5a5; }
[data-theme="dark"] .hiw-comp-badge.memory      { background: #2e1065; color: #c4b5fd; }
[data-theme="dark"] .hiw-comp-badge.orchestrator { background: #134e4a; color: #5eead4; }

.hiw-comp-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.hiw-comp-desc {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Comparison Table */
.hiw-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.hiw-compare-col {
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    font-size: 12px;
}

.hiw-compare-col.chatbot {
    background: var(--bg-secondary);
}

.hiw-compare-col.agent {
    background: var(--primary-subtle);
}

.hiw-compare-header {
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 8px;
}

.hiw-compare-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.hiw-compare-col li {
    color: var(--text-secondary);
    line-height: 1.4;
    padding-left: 14px;
    position: relative;
}

.hiw-compare-col.chatbot li::before { content: '–'; position: absolute; left: 0; color: var(--text-tertiary); }
.hiw-compare-col.agent li::before  { content: '✓'; position: absolute; left: 0; color: var(--success); font-weight: 600; }

/* Tech Tags */
.hiw-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.hiw-tag {
    font-size: 11px;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.hiw-mcp-tag {
    display: inline-block;
    font-size: 9px;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: var(--radius-full);
    background: #7c3aed;
    color: #fff;
    vertical-align: middle;
    margin-left: 4px;
    letter-spacing: 0.5px;
}

.hiw-callout {
    font-size: 12px;
    line-height: 1.5;
    padding: 10px 12px;
    margin-top: 10px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary);
    color: var(--text-secondary);
}

.hiw-desc {
    font-size: 12.5px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.input-card {
    max-width: var(--max-width);
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: flex-end;
    padding: 6px 6px 6px 20px;
    gap: 8px;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    box-shadow: var(--shadow-sm);
}

.input-card:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-card textarea {
    flex: 1;
    border: none;
    background: none;
    font-family: var(--font-sans);
    font-size: 14px;
    color: var(--text);
    resize: none;
    outline: none;
    max-height: 120px;
    min-height: 24px;
    padding: 8px 0;
    line-height: 1.5;
}

.input-card textarea::placeholder {
    color: var(--text-tertiary);
}

.send-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-lg);
    background: var(--primary);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
}

.send-btn:hover { background: var(--primary-hover); transform: scale(1.05); }
.send-btn:active { transform: scale(0.95); }
.send-btn:disabled { background: var(--border); cursor: not-allowed; transform: none; }

.send-btn svg {
    width: 18px;
    height: 18px;
}

.disclaimer {
    text-align: center;
    font-size: 11px;
    color: var(--text-tertiary);
    margin-top: 8px;
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
}

/* ── Error Toast ──────────────────────────────────────────── */
.error-msg {
    background: var(--error-bg);
    border: 1px solid var(--error);
    border-radius: var(--radius);
    padding: 12px 16px;
    font-size: 13px;
    color: var(--error);
    line-height: 1.5;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    animation: fadeUp 0.3s ease;
}

.error-msg svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 1px; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
    header { padding: 0 16px; }
    .chat-container { padding: 16px; }
    .input-area { padding: 12px 16px 16px; }

    .message.user .msg-bubble { max-width: 85%; }

    .welcome { padding: 40px 16px 24px; }
    .welcome h2 { font-size: 20px; }
    .suggestion-grid { grid-template-columns: 1fr; max-width: 100%; }

    .chart-plot { min-height: 260px; }

    .how-it-works.open { width: 320px; }
    .how-it-works.open.expanded { width: 60vw; min-width: 320px; }
}

@media (max-width: 480px) {
    .suggestion-grid { gap: 8px; }
    .suggestion-card { padding: 12px 14px; }
    header h1 { font-size: 14px; }
    .how-it-works.open { width: 100%; position: absolute; right: 0; top: 0; bottom: 0; z-index: 200; }
    .how-it-works.open.expanded { width: 100%; min-width: unset; }
    .how-it-works.expanded .hiw-scroll { columns: 1; }
}