/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #212121;
    --bg-secondary: #171717;
    --bg-tertiary: #2f2f2f;
    --bg-hover: #3a3a3a;
    --text-primary: #ececec;
    --text-secondary: #b4b4b4;
    --text-muted: #8e8e8e;
    --border-color: #444444;
    --accent-color: #10a37f;
    --accent-hover: #0d8a6a;
    --error-color: #ef4444;
    --message-user-bg: #2f2f2f;
    --message-assistant-bg: transparent;
}

body[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f7f7f8;
    --bg-tertiary: #efefef;
    --bg-hover: #e5e5e5;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-muted: #8e8e8e;
    --border-color: #d9d9d9;
    --accent-color: #10a37f;
    --accent-hover: #0d8a6a;
    --error-color: #ef4444;
    --message-user-bg: #f7f7f8;
    --message-assistant-bg: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Auth Pages */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background-color: var(--bg-secondary);
}

.auth-box {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    background-color: var(--bg-primary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

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

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 16px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s;
}

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

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

.btn {
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

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

.error-message {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
    padding: 12px;
    border-radius: 8px;
    font-size: 14px;
}

.auth-footer {
    margin-top: 24px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.auth-footer a {
    color: var(--accent-color);
    text-decoration: none;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* Chat Layout */
.chat-layout {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.collapsed {
    width: 60px;
}

.sidebar-header {
    padding: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: padding 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-new-chat {
    flex: 1;
    min-width: 0;
    height: 42px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 16px;
    background-color: var(--accent-color);
    border: 1px solid var(--accent-color);
    border-radius: 8px;
    color: white;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s, flex 0.3s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
}

.btn-new-chat:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
}

.sidebar.collapsed .btn-new-chat {
    flex: 0 0 42px;
    padding: 0;
    justify-content: center;
    gap: 0;
}

.sidebar.collapsed .sidebar-header {
    justify-content: center;
}

.btn-sidebar-toggle {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-muted);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s, opacity 0.2s, width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-sidebar-toggle:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.sidebar.collapsed .btn-sidebar-toggle {
    opacity: 0;
    width: 0;
    overflow: hidden;
    pointer-events: none;
}

.sidebar-label {
    opacity: 1;
    transition: opacity 0.2s ease;
}

.sidebar.collapsed .sidebar-label {
    opacity: 0;
    width: 0;
    overflow: hidden;
    pointer-events: none;
}

.sidebar-conversations {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 8px 12px;
    opacity: 1;
    transition: opacity 0.2s ease, padding 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.collapsed .sidebar-conversations {
    opacity: 0;
    padding: 0;
    overflow: hidden;
    pointer-events: none;
}

.conversation-item-wrapper {
    display: flex;
    align-items: center;
    margin-bottom: 4px;
    border-radius: 8px;
    position: relative;
}

.conversation-item-wrapper:hover {
    background-color: var(--bg-hover);
}

.conversation-item-wrapper:hover .btn-delete-chat {
    opacity: 1;
}

.conversation-item {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 36px 10px 12px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    overflow: hidden;
    font-size: 14px;
    transition: background-color 0.2s;
}

.conversation-item svg {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
}

.btn-delete-chat {
    position: absolute;
    right: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: transparent;
    border: none;
    border-radius: 6px;
    color: var(--text-muted);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, color 0.2s, background-color 0.2s;
}

.btn-delete-chat:hover {
    background-color: var(--bg-tertiary);
    color: var(--error-color);
}


.conversation-item.active {
    background-color: var(--bg-tertiary);
}

.conversation-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.no-conversations {
    color: var(--text-muted);
    font-size: 14px;
    text-align: center;
    padding: 20px;
}

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--border-color);
    position: relative;
}

.user-menu {
    display: flex;
    align-items: center;
    padding: 0;
    transition: padding 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.user-menu-trigger {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
    width: 100%;
}

.user-menu-trigger:hover {
    background-color: var(--bg-hover);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--text-muted);
}

.user-email {
    font-size: 13px;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    opacity: 1;
    transition: opacity 0.2s ease;
}

.sidebar.collapsed .user-email {
    opacity: 0;
    width: 0;
    overflow: hidden;
    pointer-events: none;
}

.sidebar.collapsed .user-menu {
    justify-content: center;
}

.sidebar.collapsed .user-menu-trigger {
    width: auto;
    padding: 4px;
    justify-content: center;
}

/* User menu popup */
.user-menu-popup {
    position: absolute;
    bottom: 100%;
    left: 12px;
    right: 12px;
    margin-bottom: 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    z-index: 100;
}

.user-menu-popup.hidden {
    display: none;
}

.sidebar.collapsed .user-menu-popup {
    left: 8px;
    right: auto;
    min-width: 180px;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 14px;
    background: none;
    border: none;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s;
}

.menu-item:hover {
    background-color: var(--bg-hover);
}

.menu-item-danger:hover {
    color: var(--error-color);
}

/* Main Chat Area */
.chat-main {
    flex: 1;
    position: relative;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    padding-bottom: 80px;
}

/* Welcome Screen */
.welcome-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    text-align: center;
}

.welcome-title {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 12px;
}

.welcome-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    max-width: 500px;
}

.welcome-features {
    display: flex;
    gap: 24px;
    max-width: 800px;
}

.feature {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px;
    background-color: var(--bg-tertiary);
    border-radius: 12px;
}

.feature-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent-color);
    color: white;
    border-radius: 50%;
    font-weight: 600;
    font-size: 18px;
}

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

.feature-text strong {
    display: block;
    margin-bottom: 4px;
    font-size: 14px;
}

.feature-text p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Messages */
.messages-container {
    flex: 1;
    padding: 24px 0;
}

.message {
    display: flex;
    gap: 16px;
    padding: 24px 20%;
}

.message-user {
    background-color: var(--message-user-bg);
}

.message-avatar {
    flex-shrink: 0;
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    font-size: 14px;
}

.avatar-user {
    background-color: var(--accent-color);
    color: white;
}

.avatar-assistant {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.message-content {
    flex: 1;
    min-width: 0;
}

.message-text {
    font-size: 16px;
    line-height: 1.5;
    word-wrap: break-word;
}

.message-actions {
    display: flex;
    gap: 8px;
    padding-top: 8px;
}

.btn-regenerate,
.btn-copy {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 12px;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-regenerate:hover,
.btn-copy:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.btn-regenerate svg,
.btn-copy svg {
    flex-shrink: 0;
}

/* Input Area */
.input-container {
    position: absolute;
    bottom: 0;
    left: 20%;
    right: 20%;
    padding: 12px 0;
    pointer-events: none;
}

.input-wrapper {
    display: flex;
    flex-direction: column;
    background-color: color-mix(in srgb, var(--bg-tertiary) 90%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--accent-color);
    border-radius: 16px;
    padding: 12px 16px 8px;
    pointer-events: auto;
}

.input-top-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.input-bottom-row {
    display: flex;
    align-items: center;
    padding-top: 4px;
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.5;
    resize: none;
    outline: none;
    max-height: 200px;
    font-family: inherit;
}

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

.btn-send {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--text-muted);
    border: none;
    border-radius: 8px;
    color: var(--bg-primary);
    cursor: not-allowed;
    transition: background-color 0.2s;
}

.btn-send:not(:disabled) {
    background-color: var(--accent-color);
    cursor: pointer;
}

.btn-send:not(:disabled):hover {
    background-color: var(--accent-hover);
}

.btn-send.btn-stop {
    background-color: var(--error-color, #ef4444);
    cursor: pointer;
}

.btn-send.btn-stop:hover {
    background-color: color-mix(in srgb, var(--error-color, #ef4444) 80%, black);
}

.input-hint {
    display: none;
}

/* Thinking Mode Toggle */
.thinking-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 12px;
    color: var(--text-muted);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.thinking-toggle:hover {
    color: var(--text-secondary);
    background: color-mix(in srgb, var(--text-muted) 10%, transparent);
}

.thinking-toggle.active {
    color: var(--accent-color);
    background: color-mix(in srgb, var(--accent-color) 12%, transparent);
}

.thinking-icon {
    flex-shrink: 0;
}

.thinking-label {
    font-weight: 500;
    user-select: none;
}

/* Mobile header — hidden on desktop */
.mobile-header {
    display: none;
}

.sidebar-backdrop {
    display: none;
}

/* Responsive */
@media (max-width: 1024px) {
    .message {
        padding: 24px 10%;
    }

    .input-container {
        left: 10%;
        right: 10%;
    }
}

@media (max-width: 768px) {
    /* Layout */
    .chat-layout {
        flex-direction: column;
        height: 100vh;
        height: 100dvh;
        overflow: hidden;
        position: fixed;
        inset: 0;
    }

    /* Mobile header */
    .mobile-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 8px 12px;
        padding-top: calc(8px + env(safe-area-inset-top, 0px));
        background-color: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        flex-shrink: 0;
        z-index: 50;
    }

    .mobile-hamburger,
    .mobile-new-chat {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        background: none;
        border: none;
        border-radius: 8px;
        color: var(--text-primary);
        cursor: pointer;
        text-decoration: none;
        -webkit-tap-highlight-color: transparent;
    }

    .mobile-hamburger:active,
    .mobile-new-chat:active {
        background-color: var(--bg-hover);
    }

    .mobile-chat-title {
        font-size: 15px;
        font-weight: 600;
        color: var(--text-primary);
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        text-align: center;
        flex: 1;
        padding: 0 8px;
    }

    /* Sidebar overlay */
    .sidebar-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 90;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
        -webkit-tap-highlight-color: transparent;
    }

    .sidebar-backdrop.visible {
        opacity: 1;
        pointer-events: auto;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px !important;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        padding-top: env(safe-area-inset-top, 0px);
        padding-bottom: env(safe-area-inset-bottom, 0px);
    }

    .sidebar.mobile-open {
        transform: translateX(0);
    }

    /* Force sidebar to expanded state on mobile (override desktop collapsed) */
    .sidebar.collapsed {
        width: 280px !important;
        transform: translateX(-100%);
    }

    .sidebar.collapsed.mobile-open {
        transform: translateX(0);
    }

    .sidebar.collapsed .sidebar-conversations {
        opacity: 1;
        padding: 8px 12px;
        overflow-y: auto;
        pointer-events: auto;
    }

    .sidebar.collapsed .sidebar-conversations > * {
        display: flex;
    }

    .sidebar.collapsed .sidebar-conversations .no-conversations {
        display: block;
    }

    .sidebar.collapsed .sidebar-label {
        opacity: 1;
        width: auto;
        overflow: visible;
        pointer-events: auto;
    }

    .sidebar.collapsed .btn-new-chat {
        flex: 1;
        padding: 0 16px;
        justify-content: flex-start;
        gap: 12px;
    }

    .sidebar.collapsed .btn-sidebar-toggle {
        opacity: 1;
        width: 36px;
        overflow: visible;
        pointer-events: auto;
    }

    .sidebar.collapsed .sidebar-header {
        justify-content: flex-start;
    }

    .sidebar.collapsed .user-email {
        opacity: 1;
        width: auto;
        overflow: hidden;
        pointer-events: auto;
    }

    .sidebar.collapsed .user-menu {
        justify-content: flex-start;
    }

    .sidebar.collapsed .user-menu-trigger {
        width: 100%;
        padding: 6px;
        justify-content: flex-start;
    }

    .sidebar.collapsed .user-menu-popup {
        left: 12px;
        right: 12px;
        min-width: auto;
    }

    /* Hide desktop collapse toggle on mobile */
    .btn-sidebar-toggle {
        display: none !important;
    }

    /* Chat main area */
    .chat-main {
        flex: 1;
        min-height: 0;
    }

    .chat-container {
        flex: 1;
        min-height: 0;
    }

    /* Messages */
    .message {
        padding: 12px 16px;
        gap: 10px;
    }

    .message-avatar {
        display: none;
    }

    .message-text {
        font-size: 15px;
    }

    /* Input area */
    .input-container {
        left: 12px;
        right: 12px;
        padding: 8px 0;
        padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
    }

    .input-wrapper {
        padding: 8px 12px 6px;
        border-radius: 12px;
    }

    .message-input {
        font-size: 16px; /* Prevents iOS zoom on focus */
    }

    .btn-send {
        width: 44px;
        height: 44px;
    }

    .input-hint {
        display: none;
    }

    .thinking-toggle {
        padding: 4px 10px;
        font-size: 13px;
    }

    /* Welcome screen */
    .welcome-container {
        padding: 24px 16px;
    }

    .welcome-title {
        font-size: 24px;
    }

    .welcome-subtitle {
        font-size: 14px;
        margin-bottom: 32px;
    }

    .welcome-features {
        flex-direction: column;
        gap: 12px;
    }

    .feature {
        padding: 16px;
    }

    /* LLM responses panel */
    .llm-content {
        max-height: 200px;
        font-size: 12px;
    }

    .toggle-llm-responses {
        padding: 10px 14px;
        font-size: 13px;
    }

    /* Touch-friendly buttons */
    .conversation-item {
        padding: 12px 36px 12px 12px;
        min-height: 44px;
    }

    .btn-delete-chat {
        width: 36px;
        height: 36px;
        opacity: 0.6;
    }

    .stage-nav-btn {
        width: 32px;
        height: 32px;
        font-size: 16px;
    }
}

/* Streaming UI Styles */

/* Stage Indicator */
.stage-indicator {
    display: none;
    padding: 8px 14px;
    margin-bottom: 12px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 8px;
    font-size: 13px;
    color: #60a5fa;
    animation: pulse 2s infinite;
}

.stage-indicator.stage-initial {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
    color: #60a5fa;
}

.stage-indicator.stage-critique {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
    color: #fbbf24;
}

.stage-indicator.stage-synthesis {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.stage-indicator.stage-complete {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.4);
    color: #34d399;
    animation: none;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* LLM Responses Panel */
.llm-responses {
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    background: var(--bg-secondary);
}

.llm-responses.collapsed .llm-responses-content {
    display: none;
}

.toggle-llm-responses {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-tertiary);
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 12px;
    color: var(--text-muted);
    transition: background-color 0.2s, color 0.2s;
}

.toggle-llm-responses:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.llm-responses-content {
    border-top: 1px solid var(--border-color);
}

.llm-response {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-color);
}

.llm-response:last-child {
    border-bottom: none;
}

.llm-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.llm-name {
    font-weight: 600;
    font-size: 12px;
    color: var(--text-secondary);
}

.llm-claude .llm-name { color: #d4a574; }
.llm-gpt4 .llm-name { color: #74d4a5; }
.llm-gemini .llm-name { color: #7498d4; }

.llm-status {
    font-size: 10px;
    padding: 3px 8px;
    border-radius: 4px;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.llm-status.streaming {
    background: rgba(59, 130, 246, 0.2);
    color: #60a5fa;
    animation: pulse 1s infinite;
}

.llm-status.complete {
    background: rgba(16, 185, 129, 0.2);
    color: #34d399;
}

.llm-status.error {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
}

.llm-stage-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.stage-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    padding: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s;
    line-height: 1;
}

.stage-nav-btn:hover:not(:disabled) {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.stage-nav-btn:disabled {
    opacity: 0.3;
    cursor: default;
}

.llm-content {
    font-size: 13px;
    color: var(--text-secondary);
    max-height: 300px;
    overflow-y: auto;
    word-wrap: break-word;
    line-height: 1.5;
    padding: 8px 12px;
    background: var(--bg-primary);
    border-radius: 6px;
}

.llm-content h1, .llm-content h2, .llm-content h3 {
    font-size: 14px;
    margin: 8px 0 4px;
}

.llm-content p {
    margin: 4px 0;
}

.llm-content pre {
    font-size: 12px;
    background: var(--bg-tertiary);
    padding: 8px;
    border-radius: 4px;
    overflow-x: auto;
}

.llm-content code {
    font-size: 12px;
    background: var(--bg-tertiary);
    padding: 1px 4px;
    border-radius: 3px;
}

.llm-content pre code {
    background: none;
    padding: 0;
}

/* Streaming Message Animation */
.message.streaming .message-text:after {
    content: '|';
    animation: blink 1s infinite;
    color: var(--accent-color);
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Empty State for LLM Content */
.llm-content:empty:before {
    content: 'Waiting...';
    color: var(--text-muted);
    font-style: italic;
}

/* Markdown Rendered Content Styles */
.message-text h1,
.message-text h2,
.message-text h3,
.message-text h4,
.message-text h5,
.message-text h6 {
    margin: 0.8em 0 0.2em;
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

.message-text > :first-child {
    margin-top: 0;
}

.message-text > :last-child {
    margin-bottom: 0;
}

.message-text h1 { font-size: 1.3em; }
.message-text h2 { font-size: 1.17em; }
.message-text h3 { font-size: 1.08em; }
.message-text h4 { font-size: 1em; }

.message-text p {
    margin: 0 0 0.5em;
}

.message-text ul,
.message-text ol {
    margin: 0.3em 0 0.5em;
    padding-left: 1.5em;
}

.message-text li {
    margin-bottom: 0;
}

.message-text li p {
    margin-bottom: 0;
}

.message-text strong {
    font-weight: 600;
    color: var(--text-primary);
}

.message-text em {
    font-style: italic;
}

.message-text code {
    background-color: var(--bg-tertiary);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 0.9em;
    color: #e06c75;
}

.message-text pre {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1em;
    overflow-x: auto;
    margin: 0.6em 0;
}

.message-text pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    font-size: 0.875em;
}

.message-text blockquote {
    border-left: 3px solid var(--accent-color);
    margin: 0.6em 0;
    padding: 0.5em 1em;
    background-color: var(--bg-tertiary);
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
}

.message-text blockquote p {
    margin: 0;
}

.message-text a {
    color: var(--accent-color);
    text-decoration: none;
}

.message-text a:hover {
    text-decoration: underline;
}

.message-text hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 1em 0;
}

.message-text table {
    border-collapse: collapse;
    margin: 0.6em 0;
    width: 100%;
}

.message-text th,
.message-text td {
    border: 1px solid var(--border-color);
    padding: 0.5em 0.75em;
    text-align: left;
}

.message-text th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
}

.message-text tr:nth-child(even) {
    background-color: var(--bg-secondary);
}

/* Light theme: darker accent colors for contrast on white */
body[data-theme="light"] .stage-indicator {
    color: #2563eb;
    background: rgba(37, 99, 235, 0.08);
    border-color: rgba(37, 99, 235, 0.25);
}

body[data-theme="light"] .stage-indicator.stage-initial {
    color: #2563eb;
    background: rgba(37, 99, 235, 0.08);
    border-color: rgba(37, 99, 235, 0.25);
}

body[data-theme="light"] .stage-indicator.stage-critique {
    color: #b45309;
    background: rgba(180, 83, 9, 0.08);
    border-color: rgba(180, 83, 9, 0.25);
}

body[data-theme="light"] .stage-indicator.stage-synthesis,
body[data-theme="light"] .stage-indicator.stage-complete {
    color: #047857;
    background: rgba(4, 120, 87, 0.08);
    border-color: rgba(4, 120, 87, 0.25);
}

body[data-theme="light"] .llm-claude .llm-name { color: #a0522d; }
body[data-theme="light"] .llm-gpt4 .llm-name { color: #0f7b4f; }
body[data-theme="light"] .llm-gemini .llm-name { color: #2a5db0; }

body[data-theme="light"] .llm-status.streaming {
    color: #2563eb;
    background: rgba(37, 99, 235, 0.1);
}

body[data-theme="light"] .llm-status.complete {
    color: #047857;
    background: rgba(4, 120, 87, 0.1);
}

body[data-theme="light"] .llm-status.error {
    color: #dc2626;
    background: rgba(220, 38, 38, 0.1);
}