:root {
    --color-bg: #ffffff;
    --color-surface: #f8f9fa;
    --color-border: #e5e7eb;
    --color-text: #111827;
    --color-text-secondary: #6b7280;
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;
    --radius: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --max-width: 1200px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Navigation */
nav {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.025em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.15s;
}

.nav-links a:hover {
    color: var(--color-text);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-menu {
    position: relative;
}

.user-menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    padding: var(--spacing-sm);
    border-radius: var(--radius);
}

.user-menu-btn:hover {
    background: var(--color-surface);
}

.user-dropdown {
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: var(--spacing-xs);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    min-width: 160px;
    display: none;
    flex-direction: column;
    padding: var(--spacing-xs) 0;
}

.user-dropdown a {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.875rem;
}

.user-dropdown a:hover {
    background: var(--color-surface);
}

.user-menu:hover .user-dropdown { display: flex; }

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Typography */
h1 { font-size: 1.875rem; font-weight: 700; margin: 0 0 var(--spacing-md); letter-spacing: -0.025em; }
h2 { font-size: 1.25rem; font-weight: 600; margin: 0 0 var(--spacing-md); }
h3 { font-size: 1rem; font-weight: 600; margin: 0 0 var(--spacing-sm); }
p { margin: 0 0 var(--spacing-md); color: var(--color-text-secondary); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s;
    line-height: 1;
}

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

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

.btn-secondary:hover {
    background: var(--color-surface);
    border-color: var(--color-text-secondary);
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1rem;
}

/* Cards */
.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.15s;
}

.card:hover {
    box-shadow: var(--shadow);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-sm);
}

/* Forms */
.form-control {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-family: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
    background: var(--color-bg);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 48px;
}

.composer-form textarea.form-control {
    min-height: 48px;
    max-height: 200px;
    resize: none;
    overflow-y: auto;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: capitalize;
}

.badge-pending { background: #fef3c7; color: #92400e; }
.badge-active { background: #d1fae5; color: #065f46; }
.badge-paused { background: #e0e7ff; color: #3730a3; }
.badge-completed { background: #d1fae5; color: #065f46; }
.badge-failed { background: #fee2e2; color: #991b1b; }
.badge-online { background: #d1fae5; color: #065f46; }
.badge-offline { background: #f3f4f6; color: #6b7280; }
.badge-busy { background: #fef3c7; color: #92400e; }
.badge-warning { background: #fef3c7; color: #92400e; }

.capability-override-panel.is-overridden {
    border-left: 4px solid var(--color-warning);
}

/* Dashboard grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

@media (max-width: 768px) {
    .dashboard-grid { grid-template-columns: 1fr; }
}

/* Landing hero */
.hero {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    max-width: 640px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.25rem;
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Feature cards */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--color-surface);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

/* Chat */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 64px);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    scroll-behavior: smooth;
}

.chat-message {
    max-width: 80%;
    padding: var(--spacing-md);
    border-radius: var(--radius);
    font-size: 0.875rem;
    line-height: 1.6;
}

.chat-message-user {
    align-self: flex-end;
    background: var(--color-primary);
    color: #fff;
}

.chat-message-user p,
.chat-message-user li,
.chat-message-user h1,
.chat-message-user h2,
.chat-message-user h3,
.chat-message-user h4,
.chat-message-user h5,
.chat-message-user h6,
.chat-message-user blockquote,
.chat-message-user table,
.chat-message-user th,
.chat-message-user td {
    color: #fff;
}

.chat-message-user blockquote {
    border-left-color: rgba(255, 255, 255, 0.4);
}

.chat-message-user code {
    background: rgba(255, 255, 255, 0.15);
}

.chat-message-user pre {
    background: rgba(255, 255, 255, 0.1);
}

.chat-message-user .codehilite {
    background: rgba(255, 255, 255, 0.1);
}

.chat-message-user a {
    color: #c7d2fe;
}

.chat-message-assistant {
    align-self: flex-start;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
}

.chat-message-system {
    align-self: center;
    background: #fef3c7;
    color: #92400e;
    font-size: 0.75rem;
    padding: var(--spacing-sm) var(--spacing-md);
}

.chat-message-tool {
    align-self: flex-start;
    background: #f3f4f6;
    border: 1px solid var(--color-border);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.8rem;
}

.chat-composer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg);
}

.composer-form {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
    max-width: var(--max-width);
    margin: 0 auto;
}

.composer-form textarea {
    flex: 1;
    min-height: 48px;
    max-height: 200px;
}

/* HTMX indicators */
.htmx-indicator { display: none; }
.htmx-request .htmx-indicator { display: inline-block; }
.htmx-request.htmx-indicator { display: inline-block; }

/* Toasts */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 200;
}

/* Tabs */
.tabs {
    display: flex;
    gap: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.tab-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
    margin-bottom: -1px;
}

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

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

.tab-panel {
    display: none;
}

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

/* Utility */
.text-center { text-align: center; }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--color-text-secondary);
}

.session-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.session-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--color-text);
    transition: background 0.15s;
}

.session-item:hover {
    background: var(--color-surface);
}

.session-item-title {
    font-weight: 500;
    font-size: 0.875rem;
}

.session-item-meta {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.session-toolbar {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.session-banner {
    background: #d1fae5;
    color: #065f46;
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    font-weight: 500;
    border-bottom: 1px solid #a7f3d0;
}

.session-meta {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    margin-left: var(--spacing-sm);
}

.agent-event {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    font-size: 0.8rem;
    margin: var(--spacing-xs) 0;
}

.agent-event-tool_call_started,
.agent-event-tool_result {
    padding: 2px 8px;
    margin: 2px 0;
    font-size: 0.75rem;
}

.agent-event-tool_call_started {
    color: var(--color-text-secondary);
    background: var(--color-surface);
}

.agent-event-tool_call_started .spinner {
    display: inline-block;
    width: 12px;
    height: 12px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: var(--spacing-sm);
    vertical-align: middle;
}

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

.agent-event-tool_result {
    color: var(--color-text);
    background: #f3f4f6;
}

.agent-event-tool_call_started details,
.agent-event-tool_result details {
    cursor: pointer;
    margin: 0;
    padding: 0;
}

.agent-event-tool_call_started summary,
.agent-event-tool_result summary {
    font-weight: 500;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0;
}

.agent-event-tool_call_started summary::-webkit-details-marker,
.agent-event-tool_result summary::-webkit-details-marker {
    display: none;
}

.agent-event-tool_call_started pre,
.agent-event-tool_result pre {
    margin: 4px 0 0;
    padding: 4px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 0.7rem;
}

.agent-event-tool_call_started + .agent-event-tool_result,
.agent-event-tool_result + .agent-event-tool_call_started {
    margin-top: 0;
}

.agent-event-error {
    color: var(--color-danger);
    background: #fef2f2;
}

.agent-event-tool_group {
    color: var(--color-text);
    background: #f3f4f6;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
}

.agent-event-tool_group details {
    cursor: pointer;
    margin: 0;
    padding: 0;
}

.agent-event-tool_group summary {
    font-weight: 500;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0;
}

.agent-event-tool_group summary::-webkit-details-marker {
    display: none;
}

.agent-event-tool_group summary::before {
    content: "\2713";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    font-size: 10px;
    color: #fff;
    background: var(--color-success);
    border-radius: 50%;
    margin-right: var(--spacing-xs);
}

.agent-event-tool_group pre {
    margin: 4px 0 0;
    padding: var(--spacing-sm);
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 0.75rem;
}

.tool-request,
.tool-response {
    margin-top: var(--spacing-sm);
}

.tool-section-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-text-secondary);
    margin-bottom: 2px;
    padding: 0 2px;
}

.tool-copy-btn {
    font-size: 0.65rem;
    padding: 2px 8px;
    border: 1px solid var(--color-border);
    background: #fff;
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--color-text-secondary);
    line-height: 1.4;
}

.tool-copy-btn:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

/* Markdown / Pygments code highlighting */
.chat-message .codehilite {
    background: #f3f4f6;
    padding: var(--spacing-sm);
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 0.8125rem;
    line-height: 1.5;
}

.chat-message pre {
    background: #f3f4f6;
    padding: var(--spacing-sm);
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 0.8125rem;
    line-height: 1.5;
    margin: var(--spacing-xs) 0;
}

.chat-message code {
    background: #f3f4f6;
    padding: 0.125rem 0.25rem;
    border-radius: 4px;
    font-size: 0.8125rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.chat-message pre code {
    background: transparent;
    padding: 0;
    border-radius: 0;
}

.chat-message ul, .chat-message ol {
    margin: var(--spacing-xs) 0 var(--spacing-xs) var(--spacing-md);
    padding-left: var(--spacing-md);
}

.chat-message blockquote {
    margin: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    border-left: 3px solid var(--color-border);
    color: var(--color-text-secondary);
}

.chat-message table {
    border-collapse: collapse;
    width: 100%;
    margin: var(--spacing-xs) 0;
    font-size: 0.8125rem;
}

.chat-message th, .chat-message td {
    border: 1px solid var(--color-border);
    padding: var(--spacing-xs) var(--spacing-sm);
    text-align: left;
}

.chat-message th {
    background: var(--color-surface);
    font-weight: 600;
}