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

:root {
  --bg: #0d0d0f; --bg-2: #111114; --bg-3: #16161a; --bg-4: #1c1c21;
  --border: rgba(255,255,255,0.06); --border-2: rgba(255,255,255,0.1);
  --text: #f0f0f5; --text-2: #b8b8c8; --text-3: #c8c8c8;
  --accent: #4f8ef7; --accent-dim: rgba(79,142,247,0.12);
  --green: #3dd68c; --red: #f7614f;
  --font-mono: 'JetBrains Mono', monospace; --font-sans: 'Geist', sans-serif;
}

html[data-theme="light"] {
  --bg: #ffffff; --bg-2: #f7f7fa; --bg-3: #ededf1; --bg-4: #e3e3ea;
  --border: rgba(0,0,0,0.06); --border-2: rgba(0,0,0,0.10);
  --text: #111114; --text-2: #505060; --text-3: #808090;
  --accent: #4f8ef7; --accent-dim: rgba(79,142,247,0.10);
  --green: #2db975; --red: #e85444;
}

@media (prefers-color-scheme: light) {
  html[data-theme="system"] {
    --bg: #ffffff; --bg-2: #f7f7fa; --bg-3: #ededf1; --bg-4: #e3e3ea;
    --border: rgba(0,0,0,0.06); --border-2: rgba(0,0,0,0.10);
    --text: #111114; --text-2: #505060; --text-3: #808090;
    --accent: #4f8ef7; --accent-dim: rgba(79,142,247,0.10);
    --green: #2db975; --red: #e85444;
  }
}

html, body { height: 100%; background: var(--bg); color: var(--text); font-family: var(--font-sans); font-size: 14px; line-height: 1.6; -webkit-font-smoothing: antialiased; }

/* ── Layout ── */
.app { display: grid; grid-template-columns: 220px 1fr; height: 100vh; }
.sidebar-compact .app { grid-template-columns: 180px 1fr; }

/* ── Sidebar ── */
.sidebar { background: var(--bg-2); border-right: 1px solid var(--border); display: flex; flex-direction: column; overflow: hidden; }
.sidebar-header { padding: 20px 16px 16px; border-bottom: 1px solid var(--border); }
.logo { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.logo-mark { width: 24px; height: 24px; background: var(--accent); border-radius: 6px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.logo-mark svg { width: 13px; height: 13px; fill: white; }
.logo-name { font-family: var(--font-mono); font-size: 15px; font-weight: 500; color: var(--text); }
.logo-tag { font-size: 10px; font-family: var(--font-mono); color: var(--accent); background: var(--accent-dim); padding: 2px 6px; border-radius: 4px; }
.new-chat-btn { width: 100%; padding: 7px 10px; background: transparent; border: 1px solid var(--border-2); border-radius: 6px; color: var(--text-2); font-family: var(--font-sans); font-size: 12px; cursor: pointer; display: flex; align-items: center; gap: 6px; transition: all 0.15s; }
.new-chat-btn:hover { background: var(--bg-3); color: var(--text); }
.new-chat-btn svg { width: 12px; height: 12px; opacity: 0.6; }
.sidebar-section { padding: 12px 16px 6px; }
.sidebar-label { font-size: 10px; font-family: var(--font-mono); letter-spacing: 0.08em; color: var(--text-3); text-transform: uppercase; margin-bottom: 6px; }
.chat-list { flex: 1; overflow-y: auto; padding: 4px 0; scrollbar-width: thin; scrollbar-color: var(--bg-4) transparent; }
.chat-item { border-radius: 0; cursor: pointer; transition: background 0.1s; margin-bottom: 0; border-left: 2px solid transparent; }
.chat-item:hover { background: var(--bg-3); }
.chat-item.active { border-left-color: var(--accent); }
.chat-item-title { font-size: 12px; font-family: var(--font-mono); color: var(--text-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-item-title::before { content: '> '; color: var(--accent); }
.chat-item.active .chat-item-title { color: var(--text); }
.chat-item-meta { font-size: 10px; font-family: var(--font-mono); color: var(--text-3); margin-top: 2px; }
.sidebar-footer { padding: 12px 16px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 8px; }
.user-avatar { width: 26px; height: 26px; border-radius: 50%; background: var(--bg-4); border: 1px solid var(--border-2); display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-size: 10px; color: var(--text-2); flex-shrink: 0; }
.user-info { flex: 1; overflow: hidden; }
.user-name { font-size: 12px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-plan { font-size: 10px; font-family: var(--font-mono); color: var(--accent); }

/* ── User menu popup ── */
.sidebar-footer { position: relative; cursor: pointer; }
.sidebar-footer:hover { background: var(--bg-3); border-radius: 0 0 0 0; }
.user-menu-popup { position: absolute; bottom: calc(100% + 6px); left: 8px; right: 8px; background: var(--bg-3); border: 1px solid var(--border-2); border-radius: 8px; overflow: hidden; display: none; z-index: 100; box-shadow: 0 8px 24px rgba(0,0,0,0.4); }
.user-menu-popup.visible { display: block; }
.user-menu-item { width: 100%; padding: 9px 12px; background: transparent; border: none; color: var(--text-2); font-family: var(--font-sans); font-size: 13px; cursor: pointer; display: flex; align-items: center; gap: 8px; transition: background 0.1s; text-align: left; }
.user-menu-item:hover { background: var(--bg-4); color: var(--text); }
.user-menu-item.danger:hover { color: var(--red); }
.user-menu-usage { padding: 10px 12px; border-bottom: 1px solid var(--border); }
.usage-section-label { font-size: 10px; font-family: var(--font-sans); color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 6px; }
.usage-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }
.usage-label { font-size: 11px; font-family: var(--font-sans); color: var(--text-3); }
.usage-count { font-size: 11px; font-family: var(--font-sans); color: var(--text-3); }
.usage-bar { height: 3px; background: var(--bg-4); border-radius: 2px; overflow: hidden; }
.usage-bar-fill { height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.3s ease; }
.user-menu-item svg { width: 13px; height: 13px; opacity: 0.7; flex-shrink: 0; }
.user-menu-item { text-decoration: none; }
.about-chevron { margin-left: auto; transition: transform 0.15s; }
.about-submenu { display: none; background: var(--bg-4); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.about-submenu.visible { display: block; }
.about-submenu .user-menu-item { padding-left: 32px; font-size: 12px; color: var(--text-3); }
.about-submenu .user-menu-item:hover { color: var(--text); background: transparent; }

/* ── Keyboard shortcuts modal ── */
.shortcuts-modal { max-width: 440px; }
.shortcut-group { margin-bottom: 18px; }
.shortcut-group:last-child { margin-bottom: 0; }
.shortcut-group-label { font-family: var(--font-mono); font-size: 11px; color: var(--text-3); margin-bottom: 10px; letter-spacing: 0.04em; }
.shortcut-row { display: flex; align-items: center; justify-content: space-between; padding: 9px 0; border-bottom: 1px solid var(--border); }
.shortcut-row:last-child { border-bottom: none; }
.shortcut-desc { font-size: 13px; color: var(--text-2); }
.shortcut-keys { display: flex; align-items: center; gap: 4px; }
.shortcut-keys kbd { display: inline-flex; align-items: center; justify-content: center; min-width: 22px; height: 22px; padding: 0 6px; background: var(--bg-3); border: 1px solid var(--border-2); border-bottom-width: 2px; border-radius: 4px; font-family: var(--font-mono); font-size: 11px; color: var(--text-2); }
.shortcut-keys .plus { font-size: 11px; color: var(--text-3); font-family: var(--font-mono); }

/* ── Settings modal ── */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 200; display: none; align-items: center; justify-content: center; }
.modal-overlay.visible { display: flex; }
.modal { background: var(--bg-2); border: 1px solid var(--border-2); border-radius: 12px; width: 100%; max-width: 480px; margin: 24px; }
.modal-header { padding: 20px 20px 16px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.modal-title { font-size: 15px; font-weight: 500; color: var(--text); }
.modal-close { width: 26px; height: 26px; border-radius: 6px; background: transparent; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; color: var(--text-3); transition: all 0.1s; }
.modal-close:hover { background: var(--bg-3); color: var(--text-2); }
.modal-close svg { width: 14px; height: 14px; }
.modal-body { padding: 24px 20px; }
.modal-placeholder { font-size: 13px; font-family: var(--font-mono); color: var(--text-3); text-align: center; padding: 24px 0; }

/* ── Main area ── */
.main { display: flex; flex-direction: column; overflow: hidden; background: var(--bg); }
.topbar { height: 48px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; padding: 0 20px; flex-shrink: 0; }
.topbar-model { font-family: var(--font-mono); font-size: 11px; color: var(--text-3); display: flex; align-items: center; gap: 5px; }
.model-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--green); box-shadow: 0 0 6px var(--green); animation: pulse 2.5s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.topbar-actions { display: flex; align-items: center; gap: 4px; }
.icon-btn { width: 28px; height: 28px; border-radius: 6px; background: transparent; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; color: var(--text-3); transition: all 0.1s; }
.icon-btn:hover { background: var(--bg-3); color: var(--text-2); }
.icon-btn svg { width: 14px; height: 14px; }
.icon-btn.active { color: var(--accent); background: var(--accent-dim); }
.hamburger-btn { display: none; }
.sidebar-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 299; }

/* ── Split view container ── */
.workspace { display: flex; flex: 1; overflow: hidden; }

/* ── Chat panel ── */
.chat-panel { display: flex; flex-direction: column; overflow: hidden; flex: 1; min-width: 0; }

/* ── Resizer ── */
.resizer { width: 4px; background: var(--border); cursor: col-resize; flex-shrink: 0; transition: background 0.15s; position: relative; }
.resizer:hover, .resizer.dragging { background: var(--accent); }

/* ── Preview panel ── */
.preview-panel { display: none; flex-direction: column; overflow: hidden; background: var(--bg-2); border-left: 1px solid var(--border); min-width: 300px; }
.preview-panel.visible { display: flex; flex: 1; min-width: 0; }
.preview-toolbar { height: 48px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; padding: 0 16px; flex-shrink: 0; }
.preview-label { font-family: var(--font-mono); font-size: 11px; color: var(--text-3); display: flex; align-items: center; gap: 6px; }
.preview-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--text-3); }
.preview-dot.live { background: var(--green); box-shadow: 0 0 6px var(--green); }
.preview-actions { display: flex; align-items: center; gap: 4px; }
.preview-frame { flex: 1; border: none; background: #fff; }
.preview-empty { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; }
.preview-empty-text { font-family: var(--font-mono); font-size: 12px; color: var(--text-3); }
.preview-empty-sub { font-size: 12px; color: var(--text-3); opacity: 0.6; }

/* ── Messages ── */
.messages { flex: 1; overflow-y: auto; padding: 32px 0; scrollbar-width: thin; scrollbar-color: var(--bg-4) transparent; }
.message-wrap { max-width: 740px; margin: 0 auto; padding: 0 24px; }
.message { margin-bottom: 28px; display: flex; gap: 14px; animation: fadeUp 0.2s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
.msg-avatar { width: 26px; height: 26px; border-radius: 6px; flex-shrink: 0; margin-top: 1px; display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-size: 10px; font-weight: 500; }
.msg-avatar.ada { background: var(--accent); color: white; }
.msg-avatar.user { background: var(--bg-4); border: 1px solid var(--border-2); color: var(--text-2); }
.msg-content { flex: 1; padding-top: 2px; }
.msg-sender { font-size: 11px; font-family: var(--font-mono); color: var(--text-3); margin-bottom: 6px; }
.msg-sender .time { color: var(--text-3); }
body.timestamps-hidden .time, body.timestamps-hidden .msg-time { display: none; }
.msg-text { font-size: var(--chat-font-size, 14px); color: var(--text); line-height: 1.7; }
.msg-text p { margin-bottom: 10px; }
.msg-text p:last-child { margin-bottom: 0; }
.msg-text code { font-family: var(--font-mono); font-size: 12px; background: var(--bg-3); border: 1px solid var(--border); padding: 1px 5px; border-radius: 4px; color: var(--accent); }
.msg-text pre code.hljs { background: transparent; padding: 16px 14px; font-size: var(--code-font-size, 12.5px); line-height: 1.7; tab-size: var(--tab-size, 4); }
body.word-wrap .msg-text pre code { white-space: pre-wrap; word-break: break-all; }
.msg-text pre { background: var(--bg-2); border: 1px solid var(--border); border-radius: 8px; margin: 12px 0; overflow: hidden; position: relative; }
body.line-numbers .msg-text pre { padding-left: 44px; }
.code-gutter { position: absolute; left: 0; top: 0; bottom: 0; width: 44px; padding: 16px 10px; background: var(--bg-3); border-right: 1px solid var(--border); user-select: none; text-align: right; overflow: hidden; }
.code-gutter span { display: block; font-family: var(--font-mono); font-size: var(--code-font-size, 12.5px); line-height: 1.7; color: var(--text-3); opacity: 0.5; }
.copy-code-btn { display: inline-flex; align-items: center; gap: 4px; padding: 5px 14px; background: var(--bg-3); border: none; border-top: 1px solid var(--border); color: var(--text-3); font-family: var(--font-mono); font-size: 10px; cursor: pointer; opacity: 0; transition: opacity 0.15s, color 0.15s; float: right; }
.msg-text pre:hover .copy-code-btn { opacity: 1; }
.copy-code-btn:hover { color: var(--text); background: var(--bg-4); }
.msg-text ul, .msg-text ol { margin: 8px 0 10px 20px; }
.msg-text li { margin-bottom: 4px; }
.msg-text strong { color: var(--text); font-weight: 500; }
.msg-text h1, .msg-text h2, .msg-text h3 { color: var(--text); font-weight: 500; margin: 14px 0 8px; }

/* ── Run button and sandbox ── */
.run-btn { display: inline-flex; align-items: center; gap: 6px; margin: 8px 0 4px; padding: 6px 14px; background: rgba(61,214,140,0.1); border: 1px solid rgba(61,214,140,0.3); border-radius: 6px; color: #3dd68c; font-family: var(--font-mono); font-size: 11px; cursor: pointer; transition: all 0.15s; }
.run-btn:hover { background: rgba(61,214,140,0.2); }
.run-btn svg { width: 11px; height: 11px; }
.preview-btn { display: inline-flex; align-items: center; gap: 6px; margin: 4px 0 4px 8px; padding: 6px 14px; background: var(--accent-dim); border: 1px solid rgba(79,142,247,0.3); border-radius: 6px; color: var(--accent); font-family: var(--font-mono); font-size: 11px; cursor: pointer; transition: all 0.15s; }
.preview-btn:hover { background: rgba(79,142,247,0.2); }
.sandbox-wrap { margin: 8px 0 12px; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: #fff; }
.sandbox-toolbar { background: var(--bg-3); border-bottom: 1px solid var(--border); padding: 5px 10px; display: flex; align-items: center; justify-content: space-between; }
.sandbox-label { font-family: var(--font-mono); font-size: 10px; color: var(--text-3); }
.sandbox-close { background: transparent; border: none; color: var(--text-3); cursor: pointer; font-family: var(--font-mono); font-size: 11px; padding: 2px 6px; border-radius: 4px; }
.sandbox-close:hover { background: var(--bg-4); color: var(--text-2); }
.sandbox-frame { width: 100%; border: none; display: block; min-height: 120px; }

/* ── Mode bar and input ── */
.mode-bar { display: flex; align-items: center; gap: 6px; padding: 10px 24px 0; max-width: 788px; margin: 0 auto; width: 100%; }
.mode-label { font-size: 10px; font-family: var(--font-mono); color: var(--text-3); letter-spacing: 0.06em; text-transform: uppercase; margin-right: 4px; }
.mode-btn { padding: 4px 10px; border-radius: 5px; border: 1px solid var(--border); background: transparent; color: var(--text-3); font-family: var(--font-mono); font-size: 11px; cursor: pointer; transition: all 0.12s; }
.mode-btn:hover { background: var(--bg-3); color: var(--text-2); border-color: var(--border-2); }
.mode-btn.active { background: var(--accent-dim); color: var(--accent); border-color: rgba(79,142,247,0.3); }
.input-area { padding: 16px 24px 20px; flex-shrink: 0; max-width: 788px; width: 100%; margin: 0 auto; align-self: center; }
.input-disclaimer { font-size: 11px; color: var(--text-3); text-align: center; margin-top: 8px; opacity: 0.7; }
.input-wrap { background: var(--bg-2); border: 1px solid var(--border-2); border-radius: 10px; transition: border-color 0.15s; overflow: hidden; }
.input-wrap:focus-within { border-color: rgba(79,142,247,0.4); }
.input-wrap.drag-over { border-color: rgba(79,142,247,0.7); box-shadow: 0 0 0 3px var(--accent-dim); }
.input-top { display: flex; align-items: flex-end; }
.msg-input { flex: 1; background: transparent; border: none; outline: none; resize: none; padding: 13px 14px; font-family: var(--font-sans); font-size: 14px; color: var(--text); line-height: 1.6; max-height: 160px; scrollbar-width: thin; }
.msg-input::placeholder { color: var(--text-3); }
.input-actions { display: flex; align-items: center; gap: 4px; padding: 8px 10px; flex-shrink: 0; }
.send-btn { width: 30px; height: 30px; border-radius: 6px; background: var(--accent); border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.15s; flex-shrink: 0; }
.send-btn:hover { background: #6ba3f9; }
.send-btn:active { transform: scale(0.95); }
.send-btn svg { width: 13px; height: 13px; fill: white; }
.input-footer { padding: 7px 14px; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.input-tags { display: flex; align-items: center; gap: 6px; }
.input-tag { font-size: 10px; font-family: var(--font-mono); color: var(--text-3); background: var(--bg-3); padding: 2px 7px; border-radius: 4px; border: 1px solid var(--border); cursor: pointer; transition: all 0.1s; }
.input-tag:hover { color: var(--text-2); border-color: var(--border-2); }
.char-count { font-family: var(--font-mono); font-size: 10px; color: var(--text-3); }

/* ── Paste attachments ── */
.paste-attachments { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 14px 0; }
.paste-chip { display: flex; align-items: center; gap: 6px; padding: 4px 8px 4px 10px; background: var(--bg-3); border: 1px solid var(--border-2); border-radius: 6px; font-family: var(--font-mono); font-size: 11px; color: var(--text-2); max-width: 280px; }
.paste-chip-icon { font-size: 10px; color: var(--accent); flex-shrink: 0; }
.paste-chip-label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1; }
.paste-chip-remove { background: transparent; border: none; color: var(--text-3); cursor: pointer; font-size: 13px; line-height: 1; padding: 0 2px; flex-shrink: 0; }
.paste-chip-remove:hover { color: var(--red); }
.paste-chip.code-paste { border-color: rgba(79,142,247,0.3); background: var(--accent-dim); }
.paste-chip.code-paste .paste-chip-icon { color: var(--accent); }
.paste-chip.code-paste .paste-chip-label { color: var(--accent); }

/* ── Settings modal ── */
.settings-modal { max-width: 560px; display: flex; flex-direction: column; max-height: 80vh; }
.settings-tabs { display: flex; border-bottom: 1px solid var(--border); padding: 0 20px; flex-shrink: 0; }
.settings-tab { padding: 10px 14px; background: transparent; border: none; border-bottom: 2px solid transparent; color: var(--text-3); font-family: var(--font-sans); font-size: 13px; cursor: pointer; transition: all 0.15s; margin-bottom: -1px; }
.settings-tab:hover { color: var(--text-2); }
.settings-tab.active { color: var(--text); border-bottom-color: var(--accent); }
.settings-body { overflow-y: auto; flex: 1; min-height: 380px; }
.settings-panel { display: none; padding: 8px 0; }
.settings-panel.active { display: block; }
.tips-scroll { background: var(--bg-2); border: 1px solid var(--border); border-radius: 6px; padding: 16px 20px; overflow-y: auto; max-height: 340px; margin: 8px 20px; scrollbar-width: thin; scrollbar-color: var(--bg-4) transparent; }
.tips-text { font-family: var(--font-mono); font-size: 11.5px; line-height: 2; color: var(--text-2); white-space: pre-wrap; word-break: break-word; margin: 0; }
.tips-header { color: var(--text-3); }
.setting-row { display: flex; align-items: center; justify-content: space-between; padding: 13px 20px; border-bottom: 1px solid var(--border); gap: 24px; }
.setting-row:last-child { border-bottom: none; }
.setting-info { flex: 1; }
.setting-label { font-size: 13px; color: var(--text); margin-bottom: 2px; }
.setting-desc { font-size: 11px; color: var(--text-3); }
.setting-control { flex-shrink: 0; }
.setting-select { background: var(--bg-3); border: 1px solid var(--border-2); border-radius: 6px; color: var(--text); font-family: var(--font-sans); font-size: 12px; padding: 5px 8px; outline: none; cursor: pointer; }
.setting-select:focus { border-color: rgba(79,142,247,0.5); }
.setting-value { font-size: 12px; color: var(--text-3); font-family: var(--font-sans); }
.setting-btn { padding: 5px 12px; background: var(--bg-3); border: 1px solid var(--border-2); border-radius: 6px; color: var(--text-2); font-family: var(--font-sans); font-size: 12px; cursor: pointer; transition: all 0.15s; }
.setting-btn:hover:not(:disabled) { background: var(--bg-4); color: var(--text); }
.setting-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.setting-btn.danger { color: var(--red); border-color: rgba(247,97,79,0.3); background: rgba(247,97,79,0.06); }
.setting-btn.danger:hover:not(:disabled) { background: rgba(247,97,79,0.12); }
.danger-label { color: var(--red); }
.setting-divider { height: 1px; background: var(--border-2); margin: 8px 20px; }
.setting-stepper { display: flex; align-items: center; gap: 10px; }
.stepper-btn { width: 24px; height: 24px; border-radius: 5px; background: var(--bg-3); border: 1px solid var(--border-2); color: var(--text-2); font-size: 16px; cursor: pointer; display: flex; align-items: center; justify-content: center; line-height: 1; transition: all 0.1s; }
.stepper-btn:hover { background: var(--bg-4); color: var(--text); }
.stepper-val { font-size: 12px; font-family: var(--font-mono); color: var(--text-3); min-width: 40px; text-align: center; }
.setting-toggle { position: relative; display: inline-block; width: 36px; height: 20px; cursor: pointer; }
.setting-toggle input { opacity: 0; width: 0; height: 0; }
.toggle-track { position: absolute; inset: 0; background: var(--bg-4); border: 1px solid var(--border-2); border-radius: 20px; transition: all 0.2s; }
.toggle-track::after { content: ''; position: absolute; width: 14px; height: 14px; left: 2px; top: 2px; background: var(--text-3); border-radius: 50%; transition: all 0.2s; }
.setting-toggle input:checked + .toggle-track { background: var(--accent-dim); border-color: rgba(79,142,247,0.4); }
.setting-toggle input:checked + .toggle-track::after { transform: translateX(16px); background: var(--accent); }

/* ── Sidebar empty state ── */
.chat-empty { padding: 12px 16px; font-size: 11px; font-family: var(--font-mono); color: var(--text-3); }

/* ── Chat item menu ── */
.chat-item { position: relative; display: flex; align-items: flex-start; }
.chat-item-main { flex: 1; cursor: pointer; padding: 7px 10px; overflow: hidden; }
.chat-item-menu-btn { display: none; background: transparent; border: none; color: var(--text-3); font-size: 14px; cursor: pointer; padding: 4px 6px; border-radius: 4px; flex-shrink: 0; line-height: 1; letter-spacing: 1px; margin-top: 4px; }
.chat-item:hover .chat-item-menu-btn { display: block; }
.chat-item-menu-btn:hover { background: var(--bg-4); color: var(--text-2); }
.chat-item-menu { position: absolute; right: 4px; top: 28px; background: var(--bg-3); border: 1px solid var(--border-2); border-radius: 7px; overflow: hidden; display: none; z-index: 50; min-width: 110px; box-shadow: 0 6px 16px rgba(0,0,0,0.4); }
.chat-item-menu.visible { display: block; }
.chat-item-menu button { width: 100%; padding: 8px 12px; background: transparent; border: none; color: var(--text-2); font-family: var(--font-sans); font-size: 12px; cursor: pointer; text-align: left; transition: background 0.1s; }
.chat-item-menu button:hover { background: var(--bg-4); color: var(--text); }
.chat-item-menu button.danger:hover { color: var(--red); }
.chat-item-rename { width: 100%; background: var(--bg-4); border: 1px solid rgba(79,142,247,0.5); border-radius: 4px; color: var(--text); font-family: var(--font-sans); font-size: 12px; padding: 2px 6px; outline: none; }

/* ── Onboarding modal ── */
.onboarding-modal { max-width: 480px; }
.onboarding-desc { font-size: 13px; color: var(--text-3); margin-bottom: 20px; }
.section-label { font-size: 10px; font-family: var(--font-sans); color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; margin-top: 16px; }
.section-label:first-of-type { margin-top: 0; }
.chip-group { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 4px; }
.chip { padding: 4px 11px; border: 1px solid var(--border); border-radius: 20px; font-size: 12px; font-family: var(--font-sans); color: var(--text-3); cursor: pointer; transition: all 0.12s; background: transparent; user-select: none; }
.chip:hover { border-color: var(--border-2); color: var(--text-2); }
.chip.selected { border-color: rgba(79,142,247,0.4); color: var(--accent); background: var(--accent-dim); }
.chip-group.exp .chip.selected { border-color: rgba(61,214,140,0.35); color: var(--green); background: rgba(61,214,140,0.08); }
.btn-primary-full { width: 100%; padding: 11px; background: var(--accent); border: none; border-radius: 8px; color: white; font-family: var(--font-sans); font-size: 14px; font-weight: 500; cursor: pointer; transition: background 0.15s; }
.btn-primary-full:hover { background: #6ba3f9; }
.btn-skip-inline { background: none; border: none; color: var(--text-3); font-size: 12px; font-family: var(--font-sans); cursor: pointer; padding: 4px 8px; }
.btn-skip-inline:hover { color: var(--text-2); }

/* ── Confirm popup ── */
.confirm-popup { position: fixed; z-index: 500; background: var(--bg-3); border: 1px solid var(--border-2); padding: 14px 16px; min-width: 210px; box-shadow: 0 8px 28px rgba(0,0,0,0.5); }
.confirm-popup-title { font-family: var(--font-mono); font-size: 12px; color: var(--text); margin-bottom: 5px; }
.confirm-popup-title::before { content: '> '; color: var(--accent); }
.confirm-popup-desc { font-family: var(--font-mono); font-size: 11px; color: var(--text-3); margin-bottom: 14px; line-height: 1.5; }
.confirm-popup-actions { display: flex; align-items: center; justify-content: flex-end; gap: 8px; }
.confirm-popup-cancel { background: transparent; border: none; color: var(--text-3); font-family: var(--font-mono); font-size: 11px; cursor: pointer; padding: 4px 6px; }
.confirm-popup-cancel:hover { color: var(--text-2); }
.confirm-popup-ok { background: transparent; border: 1px solid var(--border-2); color: var(--text); font-family: var(--font-mono); font-size: 11px; cursor: pointer; padding: 4px 10px; transition: all 0.1s; }
.confirm-popup-ok:hover, .confirm-popup-ok:focus { background: var(--accent-dim); color: var(--accent); border-color: rgba(79,142,247,0.3); outline: none; }

/* ── File reading status ── */
.file-reading-status { font-family: var(--font-mono); font-size: 12px; color: var(--text-3); opacity: 0.8; }

/* ── Stream errors ── */
.stream-error { display: flex; align-items: center; gap: 12px; padding: 8px 0; }
.stream-error-code { font-family: var(--font-mono); font-size: 12px; color: var(--red); }
.stream-error-retry { background: transparent; border: 1px solid rgba(247,97,79,0.3); border-radius: 5px; color: var(--red); font-family: var(--font-mono); font-size: 11px; padding: 3px 10px; cursor: pointer; transition: all 0.15s; }
.stream-error-retry:hover { background: rgba(247,97,79,0.08); }

/* ── Rate limit message ── */
.rate-limit-msg { padding: 12px 0; }
.rate-limit-title { font-family: var(--font-mono); font-size: 12px; color: var(--red); margin-bottom: 8px; }
.rate-limit-body { font-size: 13px; color: var(--text-2); margin-bottom: 10px; }
.rate-limit-upgrade { font-family: var(--font-mono); font-size: 11px; color: var(--accent); padding: 6px 10px; border: 1px solid rgba(79,142,247,0.3); border-radius: 5px; display: inline-block; }

/* ── Plan modal ── */
.plan-modal { max-width: 680px; }
.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.plan-card { background: var(--bg-3); border: 1px solid var(--border); border-radius: 10px; padding: 20px; cursor: pointer; transition: all 0.15s; }
.plan-card:hover { border-color: var(--border-2); background: var(--bg-4); }
.plan-card.selected { border-color: rgba(79,142,247,0.5); background: var(--accent-dim); }
.plan-name { font-family: var(--font-mono); font-size: 13px; font-weight: 500; color: var(--text); margin-bottom: 8px; }
.plan-price { font-size: 24px; font-weight: 500; color: var(--text); margin-bottom: 8px; }
.plan-price span { font-size: 13px; color: var(--text-3); font-weight: 400; }
.plan-desc { font-size: 12px; color: var(--text-3); margin-bottom: 12px; }
.plan-features { list-style: none; padding: 0; margin: 0; }
.plan-features li { font-size: 12px; color: var(--text-2); padding: 3px 0; font-family: var(--font-mono); }
.plan-features li::before { content: '✓ '; color: var(--green); }

/* ── Download prompt ── */
.download-prompt { display: none; align-items: center; gap: 4px; padding: 5px 10px; background: var(--bg-3); border-top: 1px solid var(--border); clear: both; }
.download-prompt.visible { display: flex; }
.download-name-input { flex: 1; background: var(--bg-4); border: 1px solid var(--border-2); border-radius: 4px; color: var(--text); font-family: var(--font-mono); font-size: 10px; padding: 3px 7px; outline: none; min-width: 0; }
.download-name-input:focus { border-color: rgba(79,142,247,0.5); }
.download-confirm-btn { padding: 3px 9px; background: var(--accent-dim); border: 1px solid rgba(79,142,247,0.3); border-radius: 4px; color: var(--accent); font-family: var(--font-mono); font-size: 10px; cursor: pointer; white-space: nowrap; transition: all 0.1s; flex-shrink: 0; }
.download-confirm-btn:hover { background: rgba(79,142,247,0.2); }
.download-cancel-btn { padding: 3px 7px; background: transparent; border: none; color: var(--text-3); font-family: var(--font-mono); font-size: 11px; cursor: pointer; flex-shrink: 0; }
.download-cancel-btn:hover { color: var(--red); }

/* ── Plan modal ── */
.plan-modal { max-width: 680px; }
.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.plan-card { background: var(--bg-3); border: 1px solid var(--border); border-radius: 10px; padding: 20px; cursor: pointer; transition: all 0.15s; }
.plan-card:hover { border-color: var(--border-2); background: var(--bg-4); }
.plan-card.selected { border-color: rgba(79,142,247,0.5); background: var(--accent-dim); }
.plan-name { font-family: var(--font-mono); font-size: 13px; font-weight: 500; color: var(--text); margin-bottom: 8px; }
.plan-price { font-size: 24px; font-weight: 500; color: var(--text); margin-bottom: 8px; }
.plan-price span { font-size: 13px; color: var(--text-3); font-weight: 400; }
.plan-desc { font-size: 12px; color: var(--text-3); margin-bottom: 12px; }
.plan-features { list-style: none; padding: 0; margin: 0; }
.plan-features li { font-size: 12px; color: var(--text-2); padding: 3px 0; font-family: var(--font-mono); }
.plan-features li::before { content: '✓ '; color: var(--green); }

/* ── Paste chip expand/collapse ── */
.paste-chip { cursor: pointer; flex-direction: column; align-items: flex-start; }
.paste-chip > .paste-chip-icon,
.paste-chip > .paste-chip-label,
.paste-chip > .paste-chip-remove { display: inline-flex; align-items: center; }
.paste-chip-header { display: flex; align-items: center; gap: 6px; width: 100%; }
.paste-chip-preview { display: none; width: 100%; margin: 6px 0 2px; padding: 8px; background: var(--bg); border-radius: 4px; border: 1px solid var(--border); font-family: var(--font-mono); font-size: 11px; color: var(--text-2); white-space: pre-wrap; word-break: break-all; max-height: 200px; overflow-y: auto; }
.paste-chip.expanded { max-width: 100%; width: 100%; }
.paste-chip.expanded .paste-chip-preview { display: block; }

/* ── Mobile layout ── */
@media (max-width: 768px) {
  /* App grid — single column, dynamic viewport height for keyboard handling */
  .app { grid-template-columns: 1fr; height: 100dvh; }

  /* Sidebar — off-canvas drawer */
  .sidebar { position: fixed; left: 0; top: 0; bottom: 0; width: 280px; z-index: 300; transform: translateX(-100%); transition: transform 0.25s ease; border-right: 1px solid var(--border-2); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop.visible { display: block; }
  .hamburger-btn { display: flex; }

  /* Topbar */
  .topbar { padding: 0 12px; }

  /* Mode bar — horizontal scroll, no wrap */
  .mode-bar { padding: 8px 12px 0; overflow-x: auto; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  .mode-bar::-webkit-scrollbar { display: none; }
  .mode-label { display: none; }
  .mode-btn { padding: 7px 12px; flex-shrink: 0; }

  /* Input area */
  .input-area { padding: 10px 12px 14px; }
  .message-wrap { padding: 0 14px; }
  .messages { padding: 20px 0; }

  /* Code blocks — allow horizontal scroll instead of clipping */
  .msg-text pre { overflow-x: auto; }

  /* Preview — not usable on mobile */
  .preview-panel { display: none !important; }
  #previewToggleBtn { display: none; }
  .resizer { display: none !important; }

  /* Modals */
  .modal { margin: 12px; }
  .settings-modal { max-height: 92vh; }
  .settings-body { min-height: auto; }
  .settings-tabs { overflow-x: auto; flex-wrap: nowrap; scrollbar-width: none; }
  .settings-tabs::-webkit-scrollbar { display: none; }
  .settings-tab { flex-shrink: 0; }

  /* Plan modal — stack cards vertically */
  .plan-modal { max-width: 100%; }
  .plan-grid { grid-template-columns: 1fr; }

  /* User menu popup — flush with sidebar footer edges */
  .user-menu-popup { left: 0; right: 0; }
}