:root {
  color-scheme: dark;
  --bg: #070a12;
  --panel: #0c111d;
  --panel-2: #111827;
  --panel-3: #172033;
  --text: #f5f7fb;
  --muted: #929cad;
  --line: rgba(255,255,255,.09);
  --accent: #a78bfa;
  --accent-2: #7c3aed;
  --glow: rgba(124,58,237,.28);
  --user: #4f46e5;
  --danger: #fb7185;
  --shadow: 0 24px 80px rgba(0,0,0,.35);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f7fb;
  --panel: #ffffff;
  --panel-2: #f0f2f7;
  --panel-3: #e8ebf3;
  --text: #161925;
  --muted: #677083;
  --line: rgba(15,23,42,.10);
  --accent: #7c3aed;
  --accent-2: #6d28d9;
  --glow: rgba(124,58,237,.16);
  --user: #6d28d9;
  --shadow: 0 24px 70px rgba(48,38,75,.14);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
button, textarea, select { font: inherit; }
button { color: inherit; }
.app-shell { height: 100dvh; display: grid; grid-template-columns: 280px minmax(0,1fr); }
.sidebar { background: var(--panel); border-right: 1px solid var(--line); padding: 20px 14px 14px; display: flex; flex-direction: column; min-width: 0; z-index: 20; }
.brand-row { display: flex; align-items: center; justify-content: space-between; padding: 0 8px 22px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 750; letter-spacing: -.02em; }
.brand-mark, .orb { display: grid; place-items: center; background: linear-gradient(145deg,#ddd6fe,#7c3aed 55%,#312e81); color: white; box-shadow: 0 0 35px var(--glow); }
.brand-mark { width: 32px; height: 32px; border-radius: 11px; }
.new-chat { width: 100%; height: 44px; border: 1px solid var(--line); background: var(--panel-2); border-radius: 12px; text-align: left; padding: 0 13px; cursor: pointer; font-weight: 650; transition: .18s ease; }
.new-chat:hover { border-color: color-mix(in srgb,var(--accent) 55%,transparent); transform: translateY(-1px); }
.new-chat span { margin-right: 8px; color: var(--accent); font-size: 19px; }
.history-label { color: var(--muted); font-size: 11px; letter-spacing: .14em; font-weight: 750; padding: 25px 10px 10px; }
.conversation-list { flex: 1; overflow-y: auto; min-height: 0; scrollbar-width: thin; }
.conversation-item { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: center; gap: 8px; border-radius: 10px; padding: 9px 8px 9px 11px; margin-bottom: 3px; color: var(--muted); cursor: pointer; border: 1px solid transparent; }
.conversation-item:hover, .conversation-item.active { background: var(--panel-2); color: var(--text); }
.conversation-item.active { border-color: var(--line); }
.conversation-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; border: 0; background: transparent; color: inherit; text-align: left; cursor: pointer; padding: 0; min-width: 0; }
.conversation-actions { display: flex; opacity: 0; }
.conversation-actions button { border: 0; background: transparent; color: var(--muted); border-radius: 6px; padding: 3px 5px; cursor: pointer; }
.conversation-item:hover .conversation-actions,.conversation-item.active .conversation-actions { opacity: 1; }
.conversation-actions button:hover { color: var(--text); background: var(--panel-3); }
.empty-history { color: var(--muted); font-size: 12px; line-height: 1.5; padding: 8px 10px; flex: 1; }
.delete-chat { opacity: 0; border: 0; background: transparent; color: var(--muted); cursor: pointer; border-radius: 6px; padding: 3px 6px; }
.conversation-item:hover .delete-chat, .conversation-item.active .delete-chat { opacity: 1; }
.delete-chat:hover { background: rgba(251,113,133,.12); color: var(--danger); }
.sidebar-footer { border-top: 1px solid var(--line); padding-top: 10px; }
.sidebar-action { display: flex; align-items: center; gap: 11px; width: 100%; padding: 10px; border: 0; background: transparent; color: var(--muted); cursor: pointer; border-radius: 9px; text-align: left; }
.sidebar-action:hover { color: var(--text); background: var(--panel-2); }
.main { min-width: 0; min-height: 0; display: grid; grid-template-rows: 64px minmax(0,1fr) auto; background: radial-gradient(circle at 50% -20%,var(--glow),transparent 35%),var(--bg); }
.topbar { display: grid; grid-template-columns: minmax(90px,1fr) auto minmax(90px,1fr); align-items: center; padding: 0 22px; border-bottom: 1px solid var(--line); backdrop-filter: blur(14px); }
.header-center { display: flex; align-items: center; gap: 8px; justify-self: center; }
.model-chip { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); background: var(--panel); border: 1px solid var(--line); padding: 7px 11px; border-radius: 99px; }
.status-dot { width: 7px; height: 7px; background: #f59e0b; border-radius: 99px; box-shadow: 0 0 8px currentColor; }
.status-dot.online { background: #34d399; }
.status-dot.offline { background: #fb7185; }
.top-actions { display: flex; align-items: center; justify-self: end; gap: 8px; }
.thinking-select { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); border: 1px solid var(--line); background: var(--panel); border-radius: 99px; padding: 4px 5px 4px 10px; font-size: 11px; }
.thinking-select select { border: 0; outline: 0; color: var(--text); background: var(--panel-2); border-radius: 99px; padding: 4px 20px 4px 8px; font-size: 12px; }
.chat-state { border-radius: 99px; font-size: 11px; padding: 5px 8px; font-weight: 700; }
.chat-state.temporary { color: #fbbf24; background: rgba(251,191,36,.1); }
.chat-state.saved { color: #34d399; background: rgba(52,211,153,.1); }
.save-chat { border: 1px solid var(--line); background: var(--panel-2); border-radius: 9px; padding: 7px 10px; cursor: pointer; font-size: 12px; font-weight: 700; }
.save-chat:disabled { color: var(--muted); cursor: default; }
.save-state { color: var(--muted); font-size: 12px; }
.icon-button { border: 0; width: 38px; height: 38px; border-radius: 10px; background: transparent; cursor: pointer; font-size: 18px; }
.icon-button:hover { background: var(--panel-2); }
.menu-button { display: none; }
.chat { overflow-y: auto; overscroll-behavior: contain; scroll-behavior: smooth; }
.welcome { max-width: 820px; margin: 0 auto; min-height: 100%; padding: clamp(38px,9vh,110px) 24px 50px; display: flex; flex-direction: column; align-items: center; text-align: center; }
.orb { width: 62px; height: 62px; border-radius: 21px; font-size: 26px; transform: rotate(-5deg); margin-bottom: 22px; }
.eyebrow { color: var(--accent); font-size: 11px; letter-spacing: .18em; font-weight: 800; margin: 0 0 10px; }
h1 { font-size: clamp(32px,5vw,52px); letter-spacing: -.045em; line-height: 1; margin: 0; }
.welcome-copy { color: var(--muted); max-width: 550px; line-height: 1.6; margin: 20px auto 30px; }
.suggestions { width: 100%; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.suggestion { border: 1px solid var(--line); background: color-mix(in srgb,var(--panel) 82%,transparent); border-radius: 14px; padding: 16px; text-align: left; cursor: pointer; transition: .18s ease; }
.suggestion:hover { border-color: color-mix(in srgb,var(--accent) 50%,transparent); transform: translateY(-2px); box-shadow: 0 12px 30px var(--glow); }
.suggestion b { display: block; margin-bottom: 5px; font-size: 14px; }
.suggestion span { color: var(--muted); font-size: 12px; }
.privacy-note { color: var(--muted); font-size: 11px; margin-top: 20px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 99px; }
.messages { display: none; width: min(850px,100%); margin: 0 auto; padding: 32px 24px 60px; }
.messages.active { display: block; }
.message { display: grid; grid-template-columns: 34px minmax(0,1fr); gap: 13px; margin-bottom: 30px; animation: rise .25s ease both; }
.message.user { grid-template-columns: minmax(0,1fr); justify-items: end; }
.message-wrap { min-width: 0; max-width: 100%; }
.user .message-wrap { display: grid; justify-items: end; max-width: min(680px,88%); }
.avatar { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font-size: 13px; background: linear-gradient(145deg,#a78bfa,#5b21b6); color: #fff; box-shadow: 0 8px 22px var(--glow); }
.message-body { min-width: 0; max-width: 100%; color: var(--text); font-size: 15px; line-height: 1.72; }
.user .message-body { max-width: 100%; background: var(--user); color: #fff; border-radius: 18px 18px 5px 18px; padding: 11px 15px; line-height: 1.55; white-space: pre-wrap; }
.message-files { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 7px; }
.message-files span { color: var(--muted); border: 1px solid var(--line); background: var(--panel-2); border-radius: 8px; padding: 5px 8px; font-size: 11px; max-width: 240px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.copy-answer { margin-top: 8px; border: 1px solid var(--line); background: transparent; color: var(--muted); border-radius: 7px; padding: 4px 8px; font-size: 11px; cursor: pointer; }
.copy-answer:hover { color: var(--text); }
.message-body p { margin: 0 0 12px; }
.message-body p:last-child { margin-bottom: 0; }
.message-body h1,.message-body h2,.message-body h3 { font-size: 1.15em; letter-spacing: -.01em; margin: 22px 0 9px; }
.message-body ul,.message-body ol { padding-left: 21px; }
.message-body code { background: var(--panel-3); border: 1px solid var(--line); border-radius: 5px; padding: 2px 5px; font: .9em ui-monospace,SFMono-Regular,Menlo,monospace; }
.message-body pre { overflow-x: auto; background: #05070d; border: 1px solid var(--line); padding: 14px; border-radius: 12px; }
.message-body pre code { border: 0; padding: 0; background: transparent; color: #d9e1f2; }
.message-body a { color: var(--accent); }
.message-meta { color: var(--muted); font-size: 11px; margin-top: 8px; }
.thinking { display: inline-flex; gap: 4px; padding-top: 9px; }
.thinking i { width: 6px; height: 6px; background: var(--accent); border-radius: 99px; animation: bounce 1.1s infinite; }
.thinking i:nth-child(2) { animation-delay: .15s; }.thinking i:nth-child(3) { animation-delay: .3s; }
.composer-wrap { width: min(850px,calc(100% - 32px)); margin: 0 auto; padding: 10px 0 max(12px,env(safe-area-inset-bottom)); }
.attachment-tray { display: flex; gap: 8px; overflow-x: auto; padding: 2px 2px 8px; scrollbar-width: thin; }
.attachment-card { flex: 0 0 min(250px,74vw); display: grid; grid-template-columns: 42px minmax(0,1fr) 24px; align-items: center; gap: 8px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 7px; }
.attachment-icon { width: 42px; height: 42px; border: 0; border-radius: 8px; overflow: hidden; background: var(--panel-3); color: var(--accent); font-size: 10px; font-weight: 800; cursor: pointer; padding: 0; }
.attachment-icon img { width: 100%; height: 100%; object-fit: cover; }
.attachment-icon:disabled { cursor: default; }
.attachment-info { min-width: 0; display: grid; gap: 3px; }
.attachment-info b { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; }
.attachment-info small { color: var(--muted); font-size: 10px; }
.attachment-remove { border: 0; background: transparent; color: var(--muted); cursor: pointer; border-radius: 7px; font-size: 17px; }
.attachment-remove:hover { color: var(--danger); background: rgba(251,113,133,.1); }
.upload-progress { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 11px; padding: 0 4px 8px; }
.spinner { width: 13px; height: 13px; border-radius: 99px; border: 2px solid var(--line); border-top-color: var(--accent); animation: spin .7s linear infinite; }
.composer { border: 1px solid var(--line); background: color-mix(in srgb,var(--panel) 94%,transparent); border-radius: 18px; padding: 12px 12px 10px; box-shadow: var(--shadow); transition: border .18s ease; }
.composer:focus-within { border-color: color-mix(in srgb,var(--accent) 55%,transparent); }
.composer textarea { width: 100%; max-height: 200px; resize: none; overflow-y: auto; color: var(--text); background: transparent; border: 0; outline: 0; padding: 2px 5px 9px; line-height: 1.5; }
.composer textarea::placeholder { color: var(--muted); }
.composer-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.composer-tools { display: flex; align-items: center; gap: 10px; }
.tool-toggle,.tool-button { border: 1px solid var(--line); background: transparent; border-radius: 8px; padding: 5px 8px; color: var(--muted); font-size: 12px; cursor: pointer; }
.tool-button:hover,.tool-toggle:hover { color: var(--text); }
.tool-toggle[aria-pressed="true"] { color: var(--accent); border-color: var(--accent); background: var(--glow); }
.shortcut { color: var(--muted); font-size: 10px; }
.send-button { width: 35px; height: 35px; border: 0; border-radius: 10px; background: var(--text); color: var(--bg); font-size: 20px; font-weight: 800; cursor: pointer; transition: .18s ease; }
.send-button:hover { transform: translateY(-1px); }
.send-button:disabled { opacity: .35; cursor: default; transform: none; }
.stop-button { border: 1px solid var(--line); border-radius: 9px; background: var(--panel-2); padding: 8px 11px; cursor: pointer; font-size: 12px; }
.hidden { display: none !important; }
.disclaimer { text-align: center; font-size: 10px; color: var(--muted); margin: 7px 0 0; }
.settings { padding: 0; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); color: var(--text); width: min(520px,calc(100% - 28px)); box-shadow: var(--shadow); }
.settings::backdrop { background: rgba(0,0,0,.6); backdrop-filter: blur(5px); }
.settings-card { padding: 22px; }
.settings-head { display: flex; align-items: flex-start; justify-content: space-between; border-bottom: 1px solid var(--line); padding-bottom: 16px; margin-bottom: 18px; }
.settings h2 { margin: 0; font-size: 23px; }
.settings label { display: grid; gap: 7px; font-size: 13px; font-weight: 650; margin-top: 15px; }
.settings select,.settings textarea { width: 100%; border: 1px solid var(--line); background: var(--panel-2); color: var(--text); border-radius: 10px; padding: 10px; outline: 0; }
.settings textarea { resize: vertical; line-height: 1.45; }
.settings-note { display: flex; gap: 10px; background: var(--panel-2); border-radius: 11px; padding: 11px; margin: 17px 0; color: var(--muted); font-size: 12px; }
.settings-note p { margin: 0; line-height: 1.5; }.settings-note b { color: var(--text); }
.primary-button { width: 100%; border: 0; border-radius: 11px; background: linear-gradient(135deg,var(--accent),var(--accent-2)); color: #fff; padding: 11px; font-weight: 750; cursor: pointer; }
.preview-dialog { width: min(900px,calc(100% - 24px)); height: min(820px,calc(100% - 24px)); padding: 0; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); color: var(--text); box-shadow: var(--shadow); }
.preview-dialog::backdrop { background: rgba(0,0,0,.7); backdrop-filter: blur(5px); }
.preview-head { height: 54px; display: flex; align-items: center; justify-content: space-between; padding: 0 14px 0 18px; border-bottom: 1px solid var(--line); }
.preview-body { height: calc(100% - 54px); display: grid; place-items: center; overflow: auto; background: #05070d; }
.preview-body img { max-width: 100%; max-height: 100%; object-fit: contain; }
.preview-body iframe { width: 100%; height: 100%; border: 0; background: white; }
.drop-zone { position: fixed; inset: 16px; z-index: 100; display: grid; place-items: center; border: 2px dashed var(--accent); border-radius: 22px; background: color-mix(in srgb,var(--bg) 90%,transparent); backdrop-filter: blur(10px); opacity: 0; pointer-events: none; transition: .15s ease; }
.drop-zone.show { opacity: 1; }
.drop-zone div { display: grid; gap: 7px; text-align: center; padding: 30px; border-radius: 16px; background: var(--panel); box-shadow: var(--shadow); }
.drop-zone span { color: var(--muted); font-size: 12px; }
.toast { position: fixed; left: 50%; bottom: 108px; transform: translate(-50%,20px); opacity: 0; pointer-events: none; background: var(--text); color: var(--bg); padding: 9px 13px; border-radius: 9px; font-size: 12px; transition: .2s ease; z-index: 99; }
.toast.show { transform: translate(-50%,0); opacity: 1; }
.scrim { display: none; }
.mobile-only { display: none; }
@keyframes bounce { 0%,60%,100%{transform:translateY(0);opacity:.45}30%{transform:translateY(-5px);opacity:1} }
@keyframes rise { from{transform:translateY(7px);opacity:0}to{transform:none;opacity:1} }
@keyframes spin { to{transform:rotate(360deg)} }

@media (max-width: 760px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: fixed; inset: 0 auto 0 0; width: min(310px,88vw); transform: translateX(-102%); transition: transform .22s ease; box-shadow: 18px 0 60px rgba(0,0,0,.35); }
  .sidebar.open { transform: translateX(0); }
  .scrim { display: block; position: fixed; inset: 0; background: rgba(0,0,0,.52); opacity: 0; pointer-events: none; transition: opacity .22s ease; z-index: 10; }
  .scrim.open { opacity: 1; pointer-events: auto; }
  .mobile-only,.menu-button { display: inline-grid; place-items: center; }
  .topbar { padding: 0 8px; grid-template-columns: 40px minmax(0,1fr) auto; }
  .header-center { gap: 4px; min-width: 0; }
  .model-chip { display: none; }
  .thinking-select > span { display: none; }
  .thinking-select { padding-left: 5px; }
  .chat-state { display: none; }
  .save-chat { padding: 7px 8px; }
  .suggestions { grid-template-columns: 1fr; }
  .suggestion { padding: 13px; }
  .welcome { padding: 42px 18px 35px; }
  .messages { padding: 23px 15px 40px; }
  .message { grid-template-columns: 30px minmax(0,1fr); gap: 10px; }
  .avatar { width: 30px; height: 30px; }
  .composer-wrap { width: calc(100% - 18px); }
  .composer-tools { gap: 5px; }
  .tool-toggle,.tool-button { padding: 6px 7px; }
  .tool-toggle span,.tool-button span { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *,*::before,*::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}