/* ═══════════════════════════════════════════════════════════
   1. CSS VARIABLES / DESIGN TOKENS
═══════════════════════════════════════════════════════════ */
:root {
    /* Backgrounds */
    --bg-0: #0a0a0a;
    --bg-1: #111111;
    --bg-2: #181818;
    --bg-3: #222222;
    --bg-4: #2a2a2a;

    /* Borders */
    --border: #242424;
    --border-subtle: #1c1c1c;
    --border-focus: #3a3a3a;

    /* Text */
    --text-primary: #efefef;
    --text-secondary: #888;
    --text-tertiary: #555;
    --text-placeholder: #444;

    /* Accent (warm cream/gold — use sparingly) */
    --accent: #e8d5b0;
    --accent-dim: #9a8e72;
    --accent-glow: rgba(232, 213, 176, 0.08);

    /* Semantic */
    --danger: #c0392b;
    --danger-hover: #a93226;
    --success: #27ae60;
    --warning: #e67e22;
    --info: #5dade2;

    /* HackClub brand — used ONLY for logo */
    --hackclub-red: #ec3750;

    /* Thinking block */
    --thinking-bg: #0f0f0d;
    --thinking-border: #28281f;
    --thinking-text: #7a7a6a;

    /* Code */
    --code-bg: #111;
    --code-header-bg: #161616;
    --code-border: #222;

    /* Sizing */
    --sidebar-width: 260px;
    --details-width: 280px;
    --header-height: 52px;
    --input-max-height: 240px;
    --border-radius: 8px;
    --border-radius-sm: 6px;
    --border-radius-lg: 12px;

    /* Transitions */
    --transition: 0.15s ease;
    --transition-slow: 0.25s ease;

    /* Fonts */
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

    /* Font size (overridable by JS for user preference) */
    --font-size: 14px;

    /* Provider accent colors */
    --provider-anthropic: #d4956a;
    --provider-openai: #74c69d;
    --provider-google: #7ab3e0;
    --provider-mistral: #b39ddb;
    --provider-deepseek: #80cbc4;
    --provider-xai: #e0e0e0;
    --provider-qwen: #ffcc80;
    --provider-default: #9e9e9e;
}

/* ═══════════════════════════════════════════════════════════
   2. CSS RESET & BASE
═══════════════════════════════════════════════════════════ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    height: 100%;
    background: var(--bg-0);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: var(--font-size);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
}

a {
    color: inherit;
}

button {
    font-family: inherit;
}

input,
textarea,
select {
    font-family: inherit;
}

.hidden {
    display: none !important;
}

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

/* ═══════════════════════════════════════════════════════════
   3. TYPOGRAPHY
═══════════════════════════════════════════════════════════ */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

kbd {
    display: inline-block;
    padding: 2px 6px;
    background: var(--bg-3);
    border: 1px solid var(--border-focus);
    border-bottom-width: 2px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════
   4. LAYOUT — #app, #sidebar, #chat-main, #details-panel
═══════════════════════════════════════════════════════════ */
#app {
    display: flex;
    height: 100vh;
    overflow: hidden;
    background: var(--bg-0);
    position: relative;
}

#sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-1);
    border-right: 1px solid var(--border);
    overflow: hidden;
    transition: transform var(--transition-slow);
    z-index: 10;
}

#chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
    overflow: hidden;
}

#details-panel {
    width: var(--details-width);
    min-width: var(--details-width);
    flex-shrink: 0;
    background: var(--bg-1);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: width var(--transition-slow), min-width var(--transition-slow), opacity var(--transition-slow);
}

#details-panel.hidden {
    display: none !important;
}

#sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 99;
}

/* ═══════════════════════════════════════════════════════════
   5. SIDEBAR — header, search, conv-list, footer
═══════════════════════════════════════════════════════════ */
#sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 12px 10px;
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

#logo {
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    user-select: none;
}

.logo-mark {
    color: var(--hackclub-red);
}

.logo-club {
    color: var(--text-primary);
}

.logo-ai {
    color: var(--accent);
}

#sidebar-search-wrap {
    position: relative;
    padding: 8px 10px;
    flex-shrink: 0;
}

.search-icon {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
}

#sidebar-search {
    width: 100%;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    padding: 6px 8px 6px 28px;
    color: var(--text-primary);
    font-size: 12px;
    outline: none;
    transition: border-color var(--transition);
}

#sidebar-search:focus {
    border-color: var(--border-focus);
}

#sidebar-search::placeholder {
    color: var(--text-placeholder);
}

#conv-list-wrap {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 4px 6px;
}

#conv-empty {
    padding: 40px 16px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 13px;
}

#sidebar-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-top: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.sidebar-footer-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.usage-reset-btn {
    padding: 6px 10px;
    font-size: 11px;
    border-radius: 999px;
}

#api-status {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 4px 6px;
    border-radius: var(--border-radius-sm);
    transition: background var(--transition);
}

#api-status:hover {
    background: var(--bg-3);
}

#api-status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-tertiary);
    flex-shrink: 0;
}

#api-status-dot.connected {
    background: var(--success);
}

#api-status-dot.error {
    background: var(--danger);
}

#api-status-label {
    font-size: 11px;
    color: var(--text-secondary);
}

.usage-badge {
    font-size: 11px;
    color: var(--accent);
    font-family: var(--font-mono);
    padding: 4px 8px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--bg-2);
    white-space: nowrap;
}

/* ═══════════════════════════════════════════════════════════
   6. CONVERSATION LIST ITEMS
═══════════════════════════════════════════════════════════ */
.conv-group-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    padding: 10px 8px 4px;
    user-select: none;
}

.conv-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 8px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    position: relative;
    transition: background var(--transition);
    group: true;
}

.conv-item:hover {
    background: var(--bg-2);
}

.conv-item.active {
    background: var(--bg-3);
}

.conv-item-pin-icon {
    color: var(--accent-dim);
    font-size: 10px;
    flex-shrink: 0;
}

.conv-item-title {
    flex: 1;
    font-size: 13px;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.conv-item.active .conv-item-title {
    color: var(--text-primary);
    font-weight: 500;
}

.conv-item-time {
    font-size: 10px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.conv-item-actions {
    display: none;
    align-items: center;
    gap: 2px;
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-3);
    border-radius: 4px;
    padding: 2px;
}

.conv-item:hover .conv-item-actions {
    display: flex;
}

.conv-item:hover .conv-item-time {
    display: none;
}

.conv-action-btn {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 3px 4px;
    border-radius: 3px;
    font-size: 12px;
    line-height: 1;
    transition: color var(--transition), background var(--transition);
}

.conv-action-btn:hover {
    color: var(--text-primary);
    background: var(--bg-4);
}

.conv-action-btn.danger:hover {
    color: var(--danger);
}

/* ═══════════════════════════════════════════════════════════
   7. CHAT HEADER
═══════════════════════════════════════════════════════════ */
#chat-header {
    display: flex;
    align-items: center;
    height: var(--header-height);
    padding: 0 12px 0 10px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-0);
    flex-shrink: 0;
    gap: 8px;
    z-index: 5;
}

#header-left {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

#header-center {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    overflow: hidden;
}

#chat-title-display {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 360px;
    padding: 3px 6px;
    border-radius: var(--border-radius-sm);
    transition: background var(--transition);
}

#chat-title-display:hover {
    background: var(--bg-2);
}

#chat-title-input {
    font-size: 14px;
    font-weight: 500;
    background: var(--bg-2);
    border: 1px solid var(--border-focus);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    padding: 3px 8px;
    outline: none;
    max-width: 360px;
    width: 100%;
}

#header-right {
    display: flex;
    align-items: center;
    gap: 2px;
    flex-shrink: 0;
    position: relative;
}

/* ═══════════════════════════════════════════════════════════
   8. MODEL SELECTOR DROPDOWN
═══════════════════════════════════════════════════════════ */
#model-selector-wrap {
    position: relative;
}

#model-selector-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 12px;
    font-weight: 500;
    padding: 5px 10px;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
    white-space: nowrap;
    max-width: 220px;
    font-family: var(--font-body);
}

#model-selector-btn:hover {
    border-color: var(--border-focus);
    background: var(--bg-3);
}

#model-selector-label {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chevron {
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: transform var(--transition);
}

#model-selector-btn[aria-expanded="true"] .chevron {
    transform: rotate(180deg);
}

#model-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    width: 320px;
    max-height: 480px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6), 0 2px 8px rgba(0, 0, 0, 0.4);
    z-index: 200;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#model-search-wrap {
    padding: 8px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

#model-search {
    width: 100%;
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    padding: 6px 10px;
    color: var(--text-primary);
    font-size: 12px;
    outline: none;
}

#model-search:focus {
    border-color: var(--border-focus);
}

#model-list {
    overflow-y: auto;
    flex: 1;
    padding: 4px;
}

.model-group-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    padding: 8px 8px 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.provider-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.provider-anthropic {
    background: var(--provider-anthropic);
}

.provider-openai {
    background: var(--provider-openai);
}

.provider-google {
    background: var(--provider-google);
}

.provider-mistral {
    background: var(--provider-mistral);
}

.provider-deepseek {
    background: var(--provider-deepseek);
}

.provider-xai {
    background: var(--provider-xai);
}

.provider-qwen {
    background: var(--provider-qwen);
}

.provider-default {
    background: var(--provider-default);
}

.model-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 8px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background var(--transition);
}

.model-item:hover,
.model-item.focused {
    background: var(--bg-3);
}

.model-item.selected {
    background: var(--accent-glow);
}

.model-item-name {
    flex: 1;
    font-size: 12px;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.model-item-ctx {
    font-size: 10px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.model-item-caps {
    display: flex;
    gap: 3px;
    flex-shrink: 0;
}

.cap-badge {
    font-size: 10px;
    padding: 1px 4px;
    border-radius: 3px;
    background: var(--bg-4);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    line-height: 1.4;
}

.cap-badge.free {
    color: var(--success);
    border-color: rgba(39, 174, 96, 0.3);
    background: rgba(39, 174, 96, 0.08);
}

/* ═══════════════════════════════════════════════════════════
   9. HEADER TOGGLE BUTTONS
═══════════════════════════════════════════════════════════ */
.toggle-btn[data-active="true"] {
    color: var(--accent) !important;
    background: var(--accent-glow) !important;
}

/* ═══════════════════════════════════════════════════════════
   10. MESSAGES CONTAINER + EMPTY STATE
═══════════════════════════════════════════════════════════ */
#messages-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 24px;
    max-width: 860px;
    margin: 0 auto;
    width: 100%;
    position: relative;
}

#messages-container.compact .message {
    margin-bottom: 8px !important;
}

#empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 60px 20px 40px;
    min-height: 60vh;
}

#empty-logo {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 12px;
}

#empty-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

#no-key-banner {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 10px 16px;
    margin-bottom: 24px;
    font-size: 13px;
    color: var(--text-secondary);
}

#no-key-banner button {
    background: var(--accent);
    color: var(--bg-0);
    border: none;
    padding: 5px 12px;
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    font-family: var(--font-body);
}

#suggestion-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    max-width: 680px;
    width: 100%;
}

.suggestion-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 12px 14px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    cursor: pointer;
    text-align: left;
    transition: border-color var(--transition), background var(--transition);
    font-family: var(--font-body);
}

.suggestion-card:hover {
    border-color: var(--border-focus);
    background: var(--bg-3);
}

.suggestion-icon {
    font-size: 18px;
    line-height: 1;
}

.suggestion-card span:last-child {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ═══════════════════════════════════════════════════════════
   11. MESSAGE BUBBLES (user + assistant)
═══════════════════════════════════════════════════════════ */
.message {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    animation: fadeSlideIn 0.2s ease;
    position: relative;
}

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

.message-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-3);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
    user-select: none;
    margin-top: 2px;
}

.message-content-wrap {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-width: calc(100% - 40px);
    min-width: 0;
}

.message.user .message-content-wrap {
    align-items: flex-end;
}

.message-content {
    font-size: var(--font-size);
    line-height: 1.65;
    color: var(--text-primary);
}

.message.user .message-content {
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: 12px 12px 4px 12px;
    padding: 10px 14px;
    max-width: 80%;
    white-space: pre-wrap;
    word-break: break-word;
}

.message.assistant .message-content {
    padding: 2px 0;
    width: 100%;
}

.attachment-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.attachment-card {
    position: relative;
    display: flex;
    gap: 10px;
    align-items: flex-start;
    max-width: 340px;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    background: var(--bg-2);
}

.message.user .attachment-card {
    background: var(--bg-3);
}

.attachment-card.image {
    flex-direction: column;
}

.attachment-image {
    width: 220px;
    max-width: 100%;
    max-height: 220px;
    border-radius: var(--border-radius-sm);
    object-fit: cover;
    cursor: pointer;
    border: 1px solid var(--border);
}

.attachment-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-3);
    border: 1px solid var(--border);
    color: var(--accent);
    font-size: 11px;
    font-family: var(--font-mono);
    flex-shrink: 0;
}

.attachment-meta {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.attachment-name {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-word;
}

.attachment-details,
.attachment-snippet {
    font-size: 11px;
    color: var(--text-secondary);
    word-break: break-word;
}

.attachment-snippet {
    line-height: 1.5;
    max-width: 260px;
}

.attachment-remove-btn {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-3);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.attachment-remove-btn:hover {
    background: var(--danger);
    color: white;
}

.message-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 2px;
    flex-wrap: wrap;
}

.message.user .message-footer {
    justify-content: flex-end;
}

.message-timestamp {
    font-size: 10px;
    color: var(--text-tertiary);
}

.token-count {
    font-size: 10px;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

.message-model-badge {
    font-size: 10px;
    color: var(--text-tertiary);
    background: var(--bg-2);
    border: 1px solid var(--border);
    padding: 1px 5px;
    border-radius: 3px;
    font-family: var(--font-mono);
}

.message-actions {
    display: flex;
    align-items: center;
    gap: 2px;
    opacity: 0;
    transition: opacity var(--transition);
    margin-top: 2px;
}

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

.message.user .message-actions {
    justify-content: flex-end;
}

.msg-action-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px 6px;
    border-radius: var(--border-radius-sm);
    font-size: 11px;
    line-height: 1;
    transition: color var(--transition), background var(--transition), border-color var(--transition);
    font-family: var(--font-body);
}

.msg-action-btn:hover {
    color: var(--text-primary);
    background: var(--bg-2);
    border-color: var(--border);
}

/* Streaming / typing indicator */
.streaming-indicator {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--text-secondary);
    font-size: 13px;
    padding: 8px 0;
}

.streaming-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--accent);
    animation: pulse 1.2s ease-in-out infinite;
}

.streaming-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.streaming-dot:nth-child(3) {
    animation-delay: 0.4s;
}

.error-message {
    color: var(--danger);
    font-size: 13px;
    padding: 8px 12px;
    background: rgba(192, 57, 43, 0.08);
    border: 1px solid rgba(192, 57, 43, 0.2);
    border-radius: var(--border-radius-sm);
}

/* ═══════════════════════════════════════════════════════════
   12. THINKING BLOCK
═══════════════════════════════════════════════════════════ */
.thinking-block {
    border-left: 2px solid var(--thinking-border);
    background: var(--thinking-bg);
    border-radius: var(--border-radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
}

.thinking-block summary {
    padding: 8px 12px;
    color: var(--thinking-text);
    font-size: 12px;
    cursor: pointer;
    font-style: italic;
    user-select: none;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color var(--transition);
}

.thinking-block summary::-webkit-details-marker {
    display: none;
}

.thinking-block summary:hover {
    color: var(--text-secondary);
}

.thinking-block[open] summary {
    border-bottom: 1px solid var(--thinking-border);
}

.thinking-content {
    padding: 8px 12px 12px;
    color: var(--thinking-text);
    font-size: 12px;
    font-style: italic;
    white-space: pre-wrap;
    font-family: var(--font-mono);
    line-height: 1.6;
    overflow-x: auto;
}

/* ═══════════════════════════════════════════════════════════
   13. CODE BLOCKS
═══════════════════════════════════════════════════════════ */
.code-block {
    position: relative;
    margin: 12px 0;
    border: 1px solid var(--code-border);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 12px;
    background: var(--code-header-bg);
    border-bottom: 1px solid var(--code-border);
}

.code-lang {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.copy-code-btn {
    font-size: 11px;
    padding: 3px 8px;
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    font-family: var(--font-body);
    transition: color var(--transition), background var(--transition);
}

.copy-code-btn:hover {
    color: var(--text-primary);
    background: var(--bg-4);
}

.copy-code-btn.copied {
    color: var(--success);
}

pre {
    margin: 0;
    background: var(--code-bg);
    overflow: hidden;
}

pre code {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.65;
    padding: 14px 16px;
    display: block;
    overflow-x: auto;
}

/* ═══════════════════════════════════════════════════════════
   14. MARKDOWN CONTENT STYLES
═══════════════════════════════════════════════════════════ */
.md-content h1,
.md-content h2,
.md-content h3,
.md-content h4,
.md-content h5,
.md-content h6 {
    color: var(--text-primary);
    font-weight: 600;
    margin: 20px 0 10px;
    line-height: 1.3;
}

.md-content h1 {
    font-size: 1.4em;
    border-bottom: 1px solid var(--border);
    padding-bottom: 6px;
}

.md-content h2 {
    font-size: 1.2em;
}

.md-content h3 {
    font-size: 1.05em;
}

.md-content h4 {
    font-size: 1em;
}

.md-content p {
    margin: 0 0 12px;
    line-height: 1.75;
}

.md-content p:last-child {
    margin-bottom: 0;
}

.md-content ul,
.md-content ol {
    padding-left: 22px;
    margin-bottom: 12px;
}

.md-content li {
    margin-bottom: 4px;
    line-height: 1.7;
}

.md-content li>ul,
.md-content li>ol {
    margin-top: 4px;
    margin-bottom: 4px;
}

.md-content blockquote {
    border-left: 3px solid var(--border-focus);
    margin: 12px 0;
    padding: 8px 16px;
    color: var(--text-secondary);
    background: var(--bg-2);
    border-radius: 0 4px 4px 0;
}

.md-content code:not(pre code) {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--bg-3);
    border: 1px solid var(--border);
    padding: 1px 5px;
    border-radius: 4px;
    color: var(--accent);
}

.md-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 13px;
    overflow-x: auto;
    display: block;
}

.md-content thead {}

.md-content th {
    background: var(--bg-3);
    font-weight: 500;
    text-align: left;
    padding: 8px 12px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.md-content td {
    padding: 8px 12px;
    border: 1px solid var(--border);
}

.md-content tr:nth-child(even) td {
    background: var(--bg-1);
}

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

.md-content a:hover {
    text-decoration: underline;
}

.md-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 20px 0;
}

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

.md-content em {
    color: var(--text-secondary);
}

/* ═══════════════════════════════════════════════════════════
   15. INPUT AREA
═══════════════════════════════════════════════════════════ */
#input-area {
    padding: 12px 24px 16px;
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-0);
    flex-shrink: 0;
}

#input-box {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-lg);
    padding: 8px 10px;
    transition: border-color var(--transition);
}

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

#message-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: var(--font-size);
    line-height: 1.6;
    resize: none;
    min-height: 24px;
    max-height: var(--input-max-height);
    overflow-y: auto;
}

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

#message-input:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#send-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--accent);
    color: var(--bg-0);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: opacity var(--transition), transform var(--transition);
}

#send-btn:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

#send-btn:active {
    transform: translateY(0);
}

#send-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
}

#stop-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--bg-3);
    color: var(--text-primary);
    border: 1px solid var(--border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background var(--transition);
}

#stop-btn:hover {
    background: var(--bg-4);
}

#input-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 2px 0;
}

#token-counter {
    font-size: 11px;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

#input-hint {
    font-size: 11px;
    color: var(--text-tertiary);
}

/* ═══════════════════════════════════════════════════════════
   16. IMAGE PREVIEW STRIP
═══════════════════════════════════════════════════════════ */
#attachment-preview-strip {
    padding: 0 2px 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#attachment-preview-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

#clear-attachments-btn {
    align-self: flex-start;
    border: 1px solid var(--border);
    background: var(--bg-2);
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    padding: 5px 10px;
    font-size: 11px;
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
}

#clear-attachments-btn:hover {
    background: var(--bg-3);
    color: var(--text-primary);
    border-color: var(--border-focus);
}

/* ═══════════════════════════════════════════════════════════
   17. SCROLL-TO-BOTTOM BUTTON
═══════════════════════════════════════════════════════════ */
#scroll-to-bottom-btn {
    position: absolute;
    bottom: 110px;
    right: 24px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px 12px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 5px;
    z-index: 10;
    transition: background var(--transition), border-color var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

#scroll-to-bottom-btn:hover {
    background: var(--bg-3);
    border-color: var(--border-focus);
    color: var(--text-primary);
}

#new-msg-badge {
    background: var(--accent);
    color: var(--bg-0);
    font-size: 9px;
    font-weight: 600;
    padding: 1px 5px;
    border-radius: 10px;
}

/* ═══════════════════════════════════════════════════════════
   18. CONTEXT WARNING BANNER
═══════════════════════════════════════════════════════════ */
#context-warning {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(230, 126, 34, 0.08);
    border-bottom: 1px solid rgba(230, 126, 34, 0.2);
    color: var(--warning);
    font-size: 12px;
    flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════
   19. DETAILS PANEL
═══════════════════════════════════════════════════════════ */
#details-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 14px 12px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

#details-header span {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

#details-content {
    overflow-y: auto;
    flex: 1;
    padding: 8px 0;
}

.details-section {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-subtle);
}

.details-section:last-child {
    border-bottom: none;
}

.details-section h4 {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    margin-bottom: 8px;
}

.details-section>div {
    font-size: 12px;
    color: var(--text-primary);
    margin-bottom: 4px;
    line-height: 1.5;
}

.details-section>div.muted {
    color: var(--text-secondary);
}

#details-model-caps {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 4px;
}

/* Generated image output */
.generated-image-wrap {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 12px 0;
}

.generated-image {
    max-width: 100%;
    max-height: 512px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    cursor: pointer;
    object-fit: contain;
}

.image-dl-btn {
    align-self: flex-start;
}

/* ═══════════════════════════════════════════════════════════
   20. SETTINGS MODAL
═══════════════════════════════════════════════════════════ */
.modal {
    position: fixed;
    inset: 0;
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-panel {
    position: relative;
    z-index: 1;
    background: var(--bg-1);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-lg);
    width: 640px;
    max-width: calc(100vw - 32px);
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.7);
    animation: modalIn 0.18s ease;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px 14px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.modal-header h2 {
    font-size: 15px;
    font-weight: 600;
}

.modal-body {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.modal-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    flex-shrink: 0;
}

/* Settings Nav */
#settings-nav {
    width: 130px;
    min-width: 130px;
    padding: 12px 6px;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex-shrink: 0;
}

.settings-tab {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 7px 10px;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-family: var(--font-body);
    text-align: left;
    transition: background var(--transition), color var(--transition);
}

.settings-tab:hover {
    background: var(--bg-3);
    color: var(--text-primary);
}

.settings-tab.active {
    background: var(--bg-3);
    color: var(--text-primary);
    font-weight: 500;
}

/* Settings Content */
#settings-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px 20px;
}

.settings-pane {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.setting-group {
    padding: 14px 0;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.setting-group:last-child {
    border-bottom: none;
}

.setting-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.setting-value-badge {
    font-size: 11px;
    font-weight: 400;
    background: var(--bg-3);
    border: 1px solid var(--border);
    padding: 1px 6px;
    border-radius: 4px;
    color: var(--accent);
    font-family: var(--font-mono);
}

.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.input-with-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

.input-with-actions input {
    flex: 1;
}

.api-key-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.api-key-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.api-keys-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 4px;
}

.api-key-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    background: var(--bg-2);
    cursor: pointer;
}

.api-key-item:hover {
    border-color: var(--border-focus);
    background: var(--bg-3);
}

.api-key-item input[type="radio"] {
    accent-color: var(--accent);
    flex-shrink: 0;
}

.api-key-item-body {
    min-width: 0;
    flex: 1;
}

.api-key-item-name {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
}

.api-key-item-key {
    font-size: 11px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    margin-top: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.api-key-item-spend {
    font-size: 11px;
    color: var(--accent);
    margin-top: 2px;
    font-family: var(--font-mono);
}

.status-line {
    font-size: 12px;
    padding: 6px 10px;
    border-radius: var(--border-radius-sm);
}

.status-line.success {
    color: var(--success);
    background: rgba(39, 174, 96, 0.08);
    border: 1px solid rgba(39, 174, 96, 0.2);
}

.status-line.error {
    color: var(--danger);
    background: rgba(192, 57, 43, 0.08);
    border: 1px solid rgba(192, 57, 43, 0.2);
}

.status-badge {
    font-size: 12px;
    padding: 5px 10px;
    border-radius: var(--border-radius-sm);
    background: var(--bg-2);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    display: inline-block;
}

.status-badge.connected {
    color: var(--success);
    border-color: rgba(39, 174, 96, 0.3);
    background: rgba(39, 174, 96, 0.06);
}

.slider-label-row {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-tertiary);
}

.radio-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-primary);
    cursor: pointer;
}

.radio-label input[type="radio"] {
    accent-color: var(--accent);
}

.danger-zone {
    gap: 8px;
}

.danger-label {
    color: var(--danger);
}

.danger-zone .btn-danger {
    width: 100%;
}

#storage-usage-bar-wrap {
    background: var(--bg-3);
    border-radius: 4px;
    height: 4px;
    overflow: hidden;
    margin-top: 4px;
}

#storage-usage-bar {
    height: 100%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

/* Shortcuts table */
#shortcuts-table {
    width: 100%;
    border-collapse: collapse;
}

#shortcuts-table td {
    padding: 7px 8px;
    font-size: 13px;
    border-bottom: 1px solid var(--border-subtle);
    vertical-align: middle;
}

#shortcuts-table td:first-child {
    display: flex;
    gap: 3px;
    flex-wrap: wrap;
}

#shortcuts-table td:last-child {
    color: var(--text-secondary);
}

/* Model picker */
.model-picker-wrap {
    position: relative;
}

.model-picker-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    padding: 8px 10px;
    cursor: pointer;
    text-align: left;
    font-family: var(--font-body);
    transition: border-color var(--transition);
}

.model-picker-btn:hover {
    border-color: var(--border-focus);
}

.model-picker-btn span {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.model-picker-wrap .dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    z-index: 300;
    max-height: 320px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.model-picker-wrap .dropdown-search {
    width: 100%;
    background: var(--bg-3);
    border: none;
    border-bottom: 1px solid var(--border);
    padding: 8px 10px;
    color: var(--text-primary);
    font-size: 12px;
    outline: none;
    flex-shrink: 0;
}

.model-picker-wrap .dropdown-list {
    overflow-y: auto;
    flex: 1;
    padding: 4px;
}

/* ═══════════════════════════════════════════════════════════
   21. COMMAND PALETTE
═══════════════════════════════════════════════════════════ */
#command-palette-panel {
    position: relative;
    z-index: 1;
    background: var(--bg-1);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-lg);
    width: 560px;
    max-width: calc(100vw - 32px);
    max-height: 480px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.8);
    overflow: hidden;
    animation: modalIn 0.15s ease;
}

#command-input-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

#command-input-wrap svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

#command-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-body);
}

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

.command-esc {
    flex-shrink: 0;
}

#command-results {
    flex: 1;
    overflow-y: auto;
    padding: 6px;
}

.command-section-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    padding: 8px 8px 4px;
    user-select: none;
}

.command-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background var(--transition);
}

.command-item:hover,
.command-item.focused {
    background: var(--bg-3);
}

.command-item-icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.command-item-label {
    flex: 1;
    font-size: 13px;
    color: var(--text-primary);
}

.command-item-label mark {
    background: transparent;
    color: var(--accent);
    font-weight: 600;
}

.command-item-shortcut {
    display: flex;
    gap: 2px;
}

.command-item-type {
    font-size: 10px;
    color: var(--text-tertiary);
    background: var(--bg-3);
    padding: 1px 5px;
    border-radius: 3px;
}

.command-empty {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 13px;
    padding: 32px 16px;
}

#command-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 8px 16px;
    border-top: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

#command-footer span {
    font-size: 11px;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ═══════════════════════════════════════════════════════════
   22. TOGGLE SWITCHES
═══════════════════════════════════════════════════════════ */
.toggle-switch {
    position: relative;
    width: 40px;
    height: 22px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-track {
    position: absolute;
    inset: 0;
    background: var(--bg-4);
    border-radius: 11px;
    cursor: pointer;
    transition: background var(--transition);
    border: 1px solid var(--border);
}

.toggle-track::after {
    content: '';
    position: absolute;
    left: 3px;
    top: 3px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--text-secondary);
    transition: transform var(--transition), background var(--transition);
}

.toggle-switch input:checked+.toggle-track {
    background: var(--accent);
    border-color: var(--accent);
}

.toggle-switch input:checked+.toggle-track::after {
    transform: translateX(18px);
    background: var(--bg-0);
}

.toggle-switch input:focus+.toggle-track {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

/* ═══════════════════════════════════════════════════════════
   23. SLIDERS
═══════════════════════════════════════════════════════════ */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--bg-4);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    border: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    transition: transform var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
}

input[type="number"] {
    width: 90px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    padding: 5px 8px;
    font-size: 12px;
    outline: none;
    font-family: var(--font-mono);
}

input[type="number"]:focus {
    border-color: var(--border-focus);
}

/* ═══════════════════════════════════════════════════════════
   24. BUTTONS
═══════════════════════════════════════════════════════════ */
.btn-primary {
    background: var(--accent);
    color: var(--bg-0);
    border: none;
    padding: 8px 18px;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity var(--transition), transform var(--transition);
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-3);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 7px 16px;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-body);
    font-size: 13px;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
}

.btn-secondary:hover {
    border-color: var(--border-focus);
    background: var(--bg-4);
}

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
    padding: 7px 16px;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-body);
    font-size: 13px;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

.btn-danger:hover {
    background: var(--danger);
    color: white;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition), background var(--transition);
    min-width: 30px;
    min-height: 30px;
}

.icon-btn:hover {
    color: var(--text-primary);
    background: var(--bg-3);
}

/* ═══════════════════════════════════════════════════════════
   25. DROPDOWNS
═══════════════════════════════════════════════════════════ */
.dropdown {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    z-index: 200;
}

.dropdown button {
    display: block;
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font-body);
    padding: 8px 14px;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition);
}

.dropdown button:hover {
    background: var(--bg-3);
}

#export-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 180px;
}

/* Text inputs */
input[type="text"],
input[type="password"],
input[type="email"] {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    padding: 7px 10px;
    font-size: 13px;
    outline: none;
    width: 100%;
    font-family: var(--font-body);
    transition: border-color var(--transition);
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus {
    border-color: var(--border-focus);
}

textarea {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    padding: 8px 10px;
    font-size: 13px;
    outline: none;
    width: 100%;
    font-family: var(--font-body);
    resize: vertical;
    transition: border-color var(--transition);
    line-height: 1.6;
}

textarea:focus {
    border-color: var(--border-focus);
}

/* ═══════════════════════════════════════════════════════════
   26. LIGHTBOX
═══════════════════════════════════════════════════════════ */
#lightbox-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    max-width: 90vw;
    max-height: 90vh;
}

#lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: var(--bg-2);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 32px;
    height: 32px;
    font-size: 18px;
    border-radius: 50%;
}

#lightbox-img {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 48px rgba(0, 0, 0, 0.8);
}

#lightbox-download {
    color: var(--accent);
    font-size: 13px;
    text-decoration: none;
    padding: 6px 14px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    transition: background var(--transition);
}

#lightbox-download:hover {
    background: var(--bg-3);
}

/* ═══════════════════════════════════════════════════════════
   27. CONFIRM DIALOG
═══════════════════════════════════════════════════════════ */
#confirm-panel {
    position: relative;
    z-index: 1;
    background: var(--bg-1);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    max-width: 360px;
    width: calc(100vw - 32px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
    animation: modalIn 0.15s ease;
}

#confirm-message {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 20px;
    line-height: 1.5;
}

#confirm-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* ═══════════════════════════════════════════════════════════
   28. TOAST NOTIFICATIONS
═══════════════════════════════════════════════════════════ */
#toast-stack {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    pointer-events: all;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 10px 16px;
    font-size: 13px;
    color: var(--text-primary);
    min-width: 240px;
    max-width: 360px;
    display: flex;
    align-items: center;
    gap: 8px;
    animation: toastIn 0.2s ease forwards;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.toast.success {
    border-left: 3px solid var(--success);
}

.toast.error {
    border-left: 3px solid var(--danger);
}

.toast.warning {
    border-left: 3px solid var(--warning);
}

.toast.info {
    border-left: 3px solid var(--info);
}

.toast.removing {
    animation: toastOut 0.2s ease forwards;
}

.toast-icon {
    font-size: 14px;
    flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════
   29. ANIMATIONS & KEYFRAMES
═══════════════════════════════════════════════════════════ */
@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

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

@keyframes toastIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes toastOut {
    to {
        transform: translateX(110%);
        opacity: 0;
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.3;
    }
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(6px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.typing-cursor::after {
    content: '▋';
    animation: blink 1s step-end infinite;
    color: var(--accent);
}

.spinning {
    animation: spin 0.8s linear infinite;
}

/* ═══════════════════════════════════════════════════════════
   30. SCROLLBAR STYLING
═══════════════════════════════════════════════════════════ */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bg-4);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-focus);
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--bg-4) transparent;
}

/* ═══════════════════════════════════════════════════════════
   31. RESPONSIVE — tablet (max 1024px) + mobile (max 768px)
═══════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 220px;
        --details-width: 240px;
    }

    #suggestion-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    #chat-title-display {
        max-width: 220px;
    }
}

@media (max-width: 768px) {
    #sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
    }

    #sidebar.open {
        transform: translateX(0);
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.5);
    }

    #sidebar-overlay {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.6);
        z-index: 99;
    }

    #sidebar-overlay.hidden {
        display: none !important;
    }

    #details-panel {
        position: fixed;
        right: 0;
        top: 0;
        bottom: 0;
        z-index: 100;
        width: 80vw;
        min-width: 0;
    }

    #messages-container {
        padding: 16px;
    }

    #input-area {
        padding: 8px 12px 12px;
    }

    .message.user .message-content {
        max-width: 90%;
    }

    #command-palette-panel {
        width: calc(100vw - 32px);
    }

    .modal-panel {
        width: calc(100vw - 24px);
        max-height: 90vh;
    }

    .modal-body {
        flex-direction: column;
    }

    #settings-nav {
        width: 100%;
        min-width: 0;
        flex-direction: row;
        overflow-x: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 8px;
        gap: 4px;
        flex-shrink: 0;
    }

    .settings-tab {
        white-space: nowrap;
    }

    #suggestion-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    #header-center {
        display: none;
    }

    #chat-title-display {
        display: none;
    }

    #input-hint {
        display: none;
    }

    #model-dropdown {
        width: 280px;
    }
}

@media (max-width: 480px) {
    #suggestion-grid {
        grid-template-columns: 1fr;
    }

    .message.user .message-content {
        max-width: 95%;
    }

    #header-right .icon-btn {
        padding: 4px;
    }
}