/* ── Variables ────────────────────────────────────────────────────────────── */

:root {
    --sidebar-width: 260px;
    --bg-main: #f7f7f5;
    --bg-sidebar: #1a1a1a;
    --bg-user-msg: #f0f0ee;
    --text-primary: #1a1a1a;
    --text-sidebar: #d4d4d4;
    --text-secondary: #666;
    --text-muted: #999;
    --accent: #c96442;
    --accent-light: #f5ede8;
    --border: #e5e5e3;
    --input-bg: #ffffff;
    --input-border: #d4d4d2;
    --tool-bg: #f8f5f0;
    --tool-border: #e8ddd2;
    --code-bg: #f4f4f2;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
}

/* ── Dark mode ────────────────────────────────────────────────────────────── */

[data-theme="dark"] {
    --bg-main: #1a1a1a;
    --bg-sidebar: #111;
    --bg-user-msg: #2a2a28;
    --text-primary: #e0e0de;
    --text-sidebar: #d4d4d4;
    --text-secondary: #aaa;
    --text-muted: #777;
    --accent: #d47a5a;
    --accent-light: #3a2a22;
    --border: #333;
    --input-bg: #222;
    --input-border: #444;
    --tool-bg: #252220;
    --tool-border: #3a352e;
    --code-bg: #252525;
}

[data-theme="dark"] #sidebar {
    background: var(--bg-sidebar);
}

[data-theme="dark"] .sidebar-header { border-bottom-color: #222; }
[data-theme="dark"] .sidebar-footer { border-top-color: #222; }
[data-theme="dark"] #new-chat-btn { background: #252525; border-color: #333; color: #ccc; }
[data-theme="dark"] #new-chat-btn:hover { background: #333; }
[data-theme="dark"] .project-item:hover { background: #222; }

[data-theme="dark"] #chat-header .icon-btn:hover,
[data-theme="dark"] .panel-header .icon-btn:hover,
[data-theme="dark"] .viewer-header .icon-btn:hover { background: rgba(255, 255, 255, 0.08); }

[data-theme="dark"] .tool-indicator .tool-result { background: rgba(255, 255, 255, 0.04); }
[data-theme="dark"] .tool-indicator .tool-result.collapsible::after {
    background: linear-gradient(transparent, rgba(37, 34, 32, 0.85), var(--tool-bg));
}
[data-theme="dark"] .tool-indicator .spinner { border-color: #444; border-top-color: var(--accent); }

[data-theme="dark"] .error-msg { color: #f77; background: #3a2020; }
[data-theme="dark"] .grid-table td { border-bottom-color: #2a2a2a; }
[data-theme="dark"] .grid-sub { border-bottom-color: #2a2a2a; }
[data-theme="dark"] .grid-excluded-item { background: #3a2020; color: #f77; }
[data-theme="dark"] .grid-remove-btn:hover { color: #f77; background: #3a2020; }
[data-theme="dark"] .grid-totals { border-top-color: var(--text-primary); }
[data-theme="dark"] .upload-done { color: #5cb; }
[data-theme="dark"] .upload-error { color: #f77; }
[data-theme="dark"] .upload-spinner { border-color: #444; border-top-color: var(--accent); }

[data-theme="dark"] .hint {
    background: #252525;
    border-color: #444;
    color: var(--text-secondary);
}
[data-theme="dark"] .hint:hover { border-color: var(--accent); color: var(--accent); }

[data-theme="dark"] .editable { background: rgba(212, 122, 90, 0.12); }
[data-theme="dark"] .editable:hover { background: rgba(212, 122, 90, 0.2); }
[data-theme="dark"] td.overridden { background: rgba(212, 122, 90, 0.12); }
[data-theme="dark"] .override-reset:hover { color: #f77; }
[data-theme="dark"] .grid-input { background: #1a1a1a; color: var(--text-primary); border-color: var(--accent); }

/* ── Reset ────────────────────────────────────────────────────────────────── */

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-main);
    height: 100vh;
    overflow: hidden;
}

/* ── Layout ───────────────────────────────────────────────────────────────── */

#app {
    display: flex;
    height: 100vh;
}

/* ── Sidebar ──────────────────────────────────────────────────────────────── */

#sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    color: var(--text-sidebar);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width 0.2s ease, opacity 0.2s ease;
    overflow: hidden;
}

#sidebar.collapsed {
    width: 0;
}

.sidebar-header {
    padding: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid #333;
}

#new-chat-btn {
    flex: 1;
    padding: 8px 12px;
    background: #333;
    color: #e0e0e0;
    border: 1px solid #444;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    font-family: var(--font-sans);
    transition: background 0.15s;
}

#new-chat-btn:hover { background: #444; }

.icon-btn {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    transition: background 0.15s;
}

.icon-btn:hover { background: rgba(255, 255, 255, 0.1); }

#project-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.project-item {
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    transition: background 0.15s;
}

.project-item:hover { background: #333; }

.project-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-sidebar);
}

.project-bid {
    font-size: 11px;
    color: #777;
    font-family: var(--font-mono);
}

.project-empty {
    padding: 8px 12px;
    font-size: 12px;
    color: #666;
    font-style: italic;
}

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid #333;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.brand {
    font-weight: 700;
    font-size: 14px;
    color: var(--accent);
    letter-spacing: 0.5px;
}

.brand-sub {
    font-size: 11px;
    color: #777;
}

/* ── Main chat area ───────────────────────────────────────────────────────── */

#chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

#chat-header {
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-main);
}

#chat-header .icon-btn { color: var(--text-primary); }
#chat-header .icon-btn:hover { background: rgba(0, 0, 0, 0.05); }

.hidden { display: none !important; }

#chat-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* ── Messages ─────────────────────────────────────────────────────────────── */

#messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px 0 16px;
    scroll-behavior: smooth;
}

.message {
    max-width: 768px;
    margin: 0 auto;
    padding: 8px 24px;
}

.message.user {
    display: flex;
    justify-content: flex-end;
    padding: 8px 24px;
}

.message.user .user-bubble {
    background: var(--bg-user-msg);
    border-radius: 16px;
    max-width: 640px;
    padding: 12px 18px;
    font-size: 15px;
    line-height: 1.5;
    white-space: pre-wrap;
}

.message.assistant {
    padding: 16px 24px;
    font-size: 15px;
    line-height: 1.6;
}

.message.assistant .msg-content > *:first-child { margin-top: 0; }
.message.assistant .msg-content > *:last-child { margin-bottom: 0; }

/* ── Welcome screen ───────────────────────────────────────────────────────── */

.welcome {
    text-align: center;
    padding: 80px 24px;
    color: var(--text-secondary);
}

.welcome h2 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.welcome p {
    font-size: 15px;
    margin-bottom: 32px;
}

.welcome-hints {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.hint {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: white;
    cursor: pointer;
    font-size: 13px;
    font-family: var(--font-sans);
    color: var(--text-secondary);
    transition: border-color 0.15s, color 0.15s;
}

.hint:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ── Tool indicators ──────────────────────────────────────────────────────── */

.tool-indicator {
    max-width: 768px;
    margin: 6px auto;
    padding: 10px 16px;
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--tool-bg);
    border-radius: 8px;
    border-left: 3px solid var(--accent);
}

.tool-indicator .tool-header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-indicator .spinner {
    width: 14px;
    height: 14px;
    border: 2px solid #ddd;
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    flex-shrink: 0;
}

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

.tool-indicator .tool-result {
    margin-top: 8px;
    font-family: var(--font-mono);
    font-size: 12px;
    white-space: pre-wrap;
    background: rgba(0, 0, 0, 0.03);
    padding: 8px 10px;
    border-radius: 4px;
    line-height: 1.4;
}

.tool-indicator .tool-result.collapsible {
    max-height: 200px;
    overflow: hidden;
    position: relative;
    cursor: pointer;
}

.tool-indicator .tool-result.collapsible::after {
    content: '▼ click to expand';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 8px 10px 4px;
    background: linear-gradient(transparent, rgba(248, 245, 240, 0.85), var(--tool-bg));
    font-family: var(--font-sans);
    font-size: 11px;
    color: var(--text-muted);
    text-align: center;
}

.tool-indicator .tool-result.expanded {
    max-height: none;
    overflow-y: auto;
    cursor: default;
}

.tool-indicator .tool-result.expanded::after {
    display: none;
}

.tool-result-collapse {
    display: none;
    margin-top: 4px;
    padding: 2px 10px;
    background: none;
    border: none;
    font-family: var(--font-sans);
    font-size: 11px;
    color: var(--text-muted);
    cursor: pointer;
    text-align: center;
    width: 100%;
}

.tool-result-collapse:hover {
    color: var(--accent);
}

.tool-result.expanded + .tool-result-collapse {
    display: block;
}

.tool-indicator .pdf-link {
    display: inline-block;
    margin-top: 6px;
    padding: 6px 14px;
    background: var(--accent);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 13px;
    transition: opacity 0.15s;
}

.tool-indicator .pdf-link:hover { opacity: 0.85; }

/* ── Input area ───────────────────────────────────────────────────────────── */

#input-area {
    border-top: 1px solid var(--border);
    padding: 16px 24px 20px;
    background: var(--bg-main);
}

#input-wrap {
    max-width: 768px;
    margin: 0 auto;
    display: flex;
    gap: 10px;
    align-items: flex-end;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 16px;
    padding: 6px 6px 6px 16px;
    transition: border-color 0.15s;
}

#input-wrap:focus-within {
    border-color: var(--accent);
}

#user-input {
    flex: 1;
    border: none;
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.5;
    resize: none;
    max-height: 200px;
    outline: none;
    background: transparent;
    padding: 6px 0;
    color: var(--text-primary);
}

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

#send-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    border: none;
    cursor: pointer;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.15s;
}

#send-btn:hover { opacity: 0.85; }
#send-btn:disabled { opacity: 0.35; cursor: default; }

/* ── Markdown content ─────────────────────────────────────────────────────── */

.message.assistant p { margin: 0.5em 0; }
.message.assistant ul, .message.assistant ol { margin: 0.5em 0; padding-left: 1.5em; }
.message.assistant li { margin: 0.25em 0; }

.message.assistant pre {
    background: var(--code-bg);
    border-radius: 8px;
    padding: 12px 16px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    margin: 8px 0;
    line-height: 1.5;
}

.message.assistant code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--code-bg);
    padding: 2px 5px;
    border-radius: 3px;
}

.message.assistant pre code {
    background: none;
    padding: 0;
    font-size: 13px;
}

.message.assistant table {
    border-collapse: collapse;
    width: 100%;
    margin: 8px 0;
    font-size: 14px;
}

.message.assistant th,
.message.assistant td {
    border: 1px solid var(--border);
    padding: 6px 12px;
    text-align: left;
}

.message.assistant th {
    background: var(--code-bg);
    font-weight: 600;
}

.message.assistant strong { font-weight: 600; }

.message.assistant h1,
.message.assistant h2,
.message.assistant h3 {
    margin: 1em 0 0.5em;
    font-weight: 600;
}

.message.assistant h1 { font-size: 1.3em; }
.message.assistant h2 { font-size: 1.15em; }
.message.assistant h3 { font-size: 1.05em; }

/* ── Error message ────────────────────────────────────────────────────────── */

.error-msg {
    color: #c44;
    background: #fef0f0;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    margin: 4px 0;
}

/* ── Streaming cursor ─────────────────────────────────────────────────────── */

.streaming .msg-content::after {
    content: '▊';
    animation: blink 1s step-end infinite;
    color: var(--accent);
}

@keyframes blink { 50% { opacity: 0; } }

/* ── Artifacts panel ──────────────────────────────────────────────────────── */

#artifacts-panel {
    width: 400px;
    min-width: 250px;
    max-width: 60vw;
    background: var(--input-bg);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow: hidden;
}

#artifacts-panel.hidden { display: none; }

.panel-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.panel-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-header .icon-btn { color: var(--text-secondary); }
.panel-header .icon-btn:hover { background: rgba(0, 0, 0, 0.05); }

/* File list */
#file-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.file-folder {
    margin-bottom: 4px;
}

.file-folder-name {
    padding: 6px 10px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.file-item {
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background 0.15s;
}

.file-item:hover { background: var(--bg-user-msg); }

.file-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    color: var(--text-muted);
}

.file-item-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-item-size {
    font-size: 11px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.file-empty {
    padding: 12px 16px;
    font-size: 13px;
    color: var(--text-muted);
    font-style: italic;
}

/* File viewer */
#file-viewer {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#file-viewer.hidden { display: none; }

.viewer-header {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.viewer-header .icon-btn { color: var(--text-secondary); }
.viewer-header .icon-btn:hover { background: rgba(0, 0, 0, 0.05); }

#viewer-filename {
    font-size: 13px;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#viewer-content {
    flex: 1;
    overflow: auto;
    padding: 12px 16px;
}

#viewer-content pre {
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
    margin: 0;
}

#viewer-content iframe {
    width: 100%;
    height: 100%;
    border: none;
}

#viewer-content .json-viewer {
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.5;
}

/* Draggable divider */
#panel-divider {
    width: 5px;
    cursor: col-resize;
    background: transparent;
    flex-shrink: 0;
    position: relative;
    z-index: 5;
}

#panel-divider:hover,
#panel-divider.dragging {
    background: var(--accent);
    opacity: 0.3;
}

#panel-divider.hidden { display: none; }

/* Toggle button active state */
#toggle-artifacts.active {
    background: var(--accent-light);
    color: var(--accent);
}

/* ── Upload controls ──────────────────────────────────────────────────────── */

.upload-btn {
    font-size: 11px;
    padding: 2px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-main);
    color: var(--accent);
    cursor: pointer;
    margin-left: 8px;
    font-family: var(--font-sans);
    transition: background 0.15s, border-color 0.15s;
}

.upload-btn:hover {
    background: var(--accent-light);
    border-color: var(--accent);
}

.upload-status {
    padding: 8px 12px;
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--tool-bg);
    border-radius: 6px;
    margin: 4px 8px;
}

.upload-spinner {
    width: 12px;
    height: 12px;
    border: 2px solid #ddd;
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
    flex-shrink: 0;
}

.drop-zone {
    margin: 6px 8px;
    padding: 24px 16px;
    border: 2px dashed var(--border);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-light);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 13px;
}

.drop-zone-icon {
    font-size: 24px;
    line-height: 1;
    color: var(--accent);
}

.drop-zone.drag-over .drop-zone-content {
    color: var(--accent);
}

.upload-done { color: #2a8; font-weight: 600; }
.upload-error { color: #c44; font-weight: 600; }

/* ── Panel tabs ──────────────────────────────────────────────────────────── */

.panel-tabs {
    display: flex;
    gap: 0;
}

.panel-tab {
    padding: 6px 14px;
    border: none;
    background: none;
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-sans);
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
}

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

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

/* ── Pricing grid ────────────────────────────────────────────────────────── */

#pricing-grid {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    font-size: 13px;
}

#pricing-grid.hidden { display: none; }

.grid-workflow {
    margin-bottom: 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.grid-wf-header {
    padding: 10px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    background: var(--code-bg);
    user-select: none;
    transition: background 0.15s;
}

.grid-wf-header:hover { background: var(--bg-user-msg); }

.grid-toggle {
    font-size: 10px;
    width: 16px;
    flex-shrink: 0;
    color: var(--text-muted);
}

.grid-wf-name {
    font-weight: 600;
    flex: 1;
}

.grid-wf-summary {
    font-size: 12px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.grid-wf-body {
    padding: 8px 12px;
}

/* Parameters row */
.grid-params {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}

.grid-param {
    display: flex;
    align-items: center;
    gap: 4px;
}

.grid-param-label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.grid-param-unit {
    font-size: 11px;
    color: var(--text-muted);
}

.grid-param-ro {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-secondary);
}

.grid-crew .editable {
    min-width: 20px;
}

/* Line items table */
.grid-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
    margin-bottom: 8px;
}

.grid-table th {
    text-align: left;
    padding: 4px 8px;
    font-weight: 600;
    font-size: 11px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.grid-table td {
    padding: 3px 8px;
    border-bottom: 1px solid #f0f0ee;
}

.grid-table td.cat {
    font-size: 11px;
    color: var(--text-muted);
}

.grid-table .num {
    text-align: right;
    font-family: var(--font-mono);
}

/* Pricing row */
.grid-pricing-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    padding: 8px 0;
    font-size: 13px;
    border-top: 1px solid var(--border);
}

.grid-unit-price {
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Section label */
.grid-section-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding: 12px 4px 6px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 4px;
}

/* Subcontractors */
.grid-sub {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 4px;
    font-size: 13px;
    border-bottom: 1px solid #f0f0ee;
}

.grid-sub-info {
    flex: 1;
    min-width: 0;
}

.grid-sub-name {
    font-weight: 500;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.grid-sub-trade {
    font-size: 11px;
    color: var(--text-muted);
}

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

.grid-sub-total {
    font-weight: 600;
    font-family: var(--font-mono);
}

.grid-markup-group {
    font-size: 11px;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Totals */
.grid-totals {
    display: flex;
    justify-content: space-between;
    padding: 12px 4px;
    font-size: 14px;
    border-top: 2px solid var(--text-primary);
    margin-top: 12px;
}

/* Default markup */
.grid-defaults {
    padding: 8px 4px;
    font-size: 12px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    margin-top: 4px;
}

.grid-defaults-label {
    font-weight: 500;
}

/* Line item action column */
.grid-action-col {
    width: 24px;
    text-align: center;
    padding: 0 2px !important;
}

.grid-remove-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 11px;
    padding: 2px 4px;
    border-radius: 3px;
    line-height: 1;
    transition: color 0.15s, background 0.15s;
}

.grid-item-row:hover .grid-remove-btn { display: inline; }
.grid-remove-btn:hover { color: #c44; background: #fef0f0; }

/* Excluded items */
.grid-excludes {
    padding: 6px 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    font-size: 12px;
}

.grid-excludes-label {
    color: var(--text-muted);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.grid-excluded-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: #fef0f0;
    border-radius: 4px;
    color: #c44;
}

.grid-excluded-name {
    text-decoration: line-through;
}

.grid-restore-btn {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 11px;
    padding: 0 2px;
    text-decoration: underline;
}

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

/* Add item row */
.grid-add-row {
    padding: 4px 0;
}

.grid-add-btn {
    background: none;
    border: 1px dashed var(--border);
    border-radius: 4px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 12px;
    font-family: var(--font-sans);
    padding: 4px 10px;
    transition: color 0.15s, border-color 0.15s;
}

.grid-add-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.grid-add-form {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    padding: 8px 0;
}

.grid-add-input {
    padding: 4px 8px;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    font-size: 12px;
    font-family: var(--font-sans);
    outline: none;
    background: var(--input-bg);
}

.grid-add-input:focus { border-color: var(--accent); }

.grid-add-input:first-of-type { flex: 1; min-width: 100px; }

.grid-add-rate { width: 70px; }
.grid-add-days { width: 50px; }

.grid-add-select {
    padding: 4px 6px;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    font-size: 12px;
    font-family: var(--font-sans);
    background: var(--input-bg);
    outline: none;
}

.grid-add-select:focus { border-color: var(--accent); }

.grid-add-unit-sel { width: 70px; }

.grid-add-submit {
    padding: 4px 12px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 12px;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: opacity 0.15s;
}

.grid-add-submit:hover { opacity: 0.85; }

.grid-add-cancel {
    padding: 4px 8px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 12px;
    font-family: var(--font-sans);
    cursor: pointer;
    color: var(--text-secondary);
    transition: background 0.15s;
}

.grid-add-cancel:hover { background: var(--bg-user-msg); }

/* Editable cells */
.editable {
    font-family: var(--font-mono);
    font-weight: 500;
    padding: 1px 4px;
    border-radius: 3px;
    cursor: pointer;
    background: rgba(201, 100, 66, 0.08);
    border: 1px solid transparent;
    transition: background 0.15s, border-color 0.15s;
    display: inline-block;
    min-width: 24px;
    text-align: right;
}

.editable:hover {
    background: rgba(201, 100, 66, 0.15);
    border-color: var(--accent);
}

.grid-input {
    width: 80px;
    padding: 1px 4px;
    font-family: var(--font-mono);
    font-size: inherit;
    font-weight: 500;
    border: 1px solid var(--accent);
    border-radius: 3px;
    outline: none;
    background: white;
    text-align: right;
}

/* Override cells */
.editable-cell {
    cursor: pointer;
    padding: 1px 3px;
    border-radius: 2px;
    transition: background 0.15s;
}

.editable-cell:hover {
    background: rgba(201, 100, 66, 0.12);
}

td.overridden {
    background: rgba(201, 100, 66, 0.08);
    position: relative;
}

.override-reset {
    display: none;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 11px;
    cursor: pointer;
    padding: 0 2px;
    line-height: 1;
    vertical-align: middle;
    margin-left: 2px;
}

td.overridden:hover .override-reset {
    display: inline;
}

.override-reset:hover {
    color: #c44;
}

/* ── Login screen ────────────────────────────────────────────────────────── */

#login-screen {
    position: fixed;
    inset: 0;
    background: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.login-box {
    width: 360px;
    padding: 40px 32px;
    text-align: center;
}

.login-box h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.login-box > p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

#login-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

#login-form input {
    padding: 10px 14px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 14px;
    font-family: var(--font-sans);
    background: var(--input-bg);
    color: var(--text-primary);
    outline: none;
}

#login-form input:focus {
    border-color: var(--accent);
}

#login-btn {
    padding: 10px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: opacity 0.15s;
}

#login-btn:hover { opacity: 0.85; }

#login-error {
    font-size: 13px;
    color: #c44;
    padding: 8px;
    background: #fef0f0;
    border-radius: 6px;
}

#login-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    color: var(--text-muted);
    font-size: 13px;
}

#login-divider::before,
#login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.google-btn {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

.google-btn:hover {
    border-color: var(--accent);
    background: var(--accent-light);
}

[data-theme="dark"] #login-error {
    color: #f77;
    background: #3a2020;
}

/* ── Responsive ───────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
    #sidebar { position: fixed; z-index: 10; height: 100vh; }
    #sidebar.collapsed { width: 0; }
    .message.user { padding: 8px 16px; }
    .message.assistant { padding: 12px 16px; }
    #input-area { padding: 12px 16px 16px; }
}