:root {
  --bg: #f6f7f9;
  --bg-elev: #ffffff;
  --bg-side: #f0f1f4;
  --bg-hover: #e6e8ec;
  --text: #1c1f24;
  --text-dim: #6b7280;
  --border: #e2e5ea;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, .12);
  --bubble-user: #3b82f6;
  --bubble-user-text: #ffffff;
  --bubble-ai: #ffffff;
  --danger: #e5484d;
  --radius: 12px;
  --shadow: 0 8px 30px rgba(16, 24, 40, .10);
}
.theme-dark {
  --bg: #17181c;
  --bg-elev: #202227;
  --bg-side: #1b1d21;
  --bg-hover: #2a2d34;
  --text: #e7e9ee;
  --text-dim: #9096a2;
  --border: #2e3138;
  --accent: #4f8cff;
  --accent-soft: rgba(79, 140, 255, .16);
  --bubble-user: #3b6fe0;
  --bubble-user-text: #ffffff;
  --bubble-ai: #24262c;
  --danger: #ff6b6b;
  --shadow: 0 10px 34px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei",
               "PingFang SC", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg); color: var(--text); font-size: 14px; overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
.hidden { display: none !important; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: 14px; color: var(--text); }
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: rgba(140, 146, 160, .38); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: rgba(140, 146, 160, .6); }
::-webkit-scrollbar-track { background: transparent; }

.app { display: flex; height: 100vh; }

/* ---------------- sidebar ---------------- */
.sidebar {
  width: 260px; flex: 0 0 260px; background: var(--bg-side);
  border-right: 1px solid var(--border); display: flex; flex-direction: column;
}
.side-head { display: flex; align-items: center; justify-content: space-between; padding: 12px 12px 8px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14px; }
.brand .logo { font-size: 17px; }
.side-search { padding: 0 12px 8px; }
.side-search input {
  width: 100%; padding: 7px 10px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-elev); outline: none;
}
.side-search input:focus { border-color: var(--accent); }
.conv-list { flex: 1; overflow-y: auto; padding: 4px 8px 8px; }
.conv-item {
  display: flex; align-items: center; gap: 8px; padding: 8px 9px; border-radius: 9px;
  cursor: pointer; color: var(--text); margin-bottom: 2px; position: relative;
}
.conv-item:hover { background: var(--bg-hover); }
.conv-item.active { background: var(--accent-soft); }
.conv-item .title { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-item .meta { font-size: 11px; color: var(--text-dim); display: flex; align-items: center; gap: 5px; min-width: 0; }
.conv-item .meta .cmodel {
  max-width: 92px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  background: var(--bg-hover); border-radius: 4px; padding: 0 4px; flex: 0 1 auto;
}
.conv-item.active .meta .cmodel { background: var(--accent-soft); color: var(--accent); }
.conv-item .del {
  opacity: 0; border: none; background: transparent; color: var(--text-dim);
  font-size: 15px; line-height: 1; padding: 2px 4px; border-radius: 6px;
}
.conv-item:hover .del { opacity: 1; }
.conv-item .del:hover { color: var(--danger); background: var(--bg-elev); }
.conv-empty { color: var(--text-dim); font-size: 12.5px; text-align: center; padding: 18px 8px; }
.side-foot { border-top: 1px solid var(--border); padding: 8px 12px 10px; display: flex; flex-direction: column; gap: 6px; }
.side-status { display: flex; align-items: center; gap: 6px; font-size: 11.5px; color: var(--text-dim); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: #b9bec9; display: inline-block; flex: 0 0 7px; }
.dot.ok { background: #2fbf71; box-shadow: 0 0 0 3px rgba(47, 191, 113, .18); }
.dot.bad { background: var(--danger); }

/* ---------------- main ---------------- */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; background: var(--bg); }
.topbar {
  display: flex; align-items: center; gap: 8px; padding: 9px 14px;
  border-bottom: 1px solid var(--border); background: var(--bg-elev);
}
.spacer { flex: 1; }
.icon-btn {
  border: 1px solid transparent; background: transparent; color: var(--text);
  border-radius: 8px; padding: 5px 9px; font-size: 15px; line-height: 1.2;
}
.icon-btn:hover { background: var(--bg-hover); }
.ghost-btn {
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text);
  border-radius: 8px; padding: 6px 12px; font-size: 13px;
}
.ghost-btn:hover { background: var(--bg-hover); }
.primary-btn {
  border: none; background: var(--accent); color: #fff; border-radius: 8px;
  padding: 7px 16px; font-size: 13px; font-weight: 500;
}
.primary-btn:hover { filter: brightness(1.07); }
.link-btn { border: none; background: transparent; color: var(--accent); font-size: 12.5px; padding: 4px 6px; border-radius: 6px; }
.link-btn:hover { background: var(--accent-soft); }

/* model picker */
.model-picker { position: relative; }
.model-btn {
  display: flex; align-items: center; gap: 8px; max-width: 340px;
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text);
  border-radius: 9px; padding: 6px 10px; font-size: 13.5px;
}
.model-btn:hover { background: var(--bg-hover); }
.model-name { max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chev { color: var(--text-dim); font-size: 11px; }
.dropdown {
  position: absolute; top: calc(100% + 6px); left: 0; width: 340px; z-index: 40;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden; display: none;
}
.dropdown.open { display: block; }
.dropdown-search { padding: 8px; border-bottom: 1px solid var(--border); }
.dropdown-search input { width: 100%; padding: 6px 9px; border-radius: 7px; border: 1px solid var(--border); background: var(--bg); outline: none; }
.dropdown-list { max-height: 320px; overflow-y: auto; padding: 4px; }
.model-option { display: flex; align-items: center; gap: 8px; padding: 7px 9px; border-radius: 8px; cursor: pointer; font-size: 13px; }
.model-option:hover { background: var(--bg-hover); }
.model-option.selected { background: var(--accent-soft); }
.model-option .mid { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.model-option .tag { font-size: 10.5px; color: var(--text-dim); border: 1px solid var(--border); border-radius: 5px; padding: 0 5px; }
.dropdown-foot { display: flex; justify-content: space-between; padding: 6px 8px; border-top: 1px solid var(--border); }
.field-inline { display: flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--text-dim); }
.field-inline select {
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text);
  border-radius: 8px; padding: 5px 7px; font-size: 12.5px;
}

/* ---------------- chat ---------------- */
.chat-scroll { flex: 1; overflow-y: auto; scroll-behavior: smooth; }
.chat-inner { max-width: 860px; margin: 0 auto; padding: 22px 18px 12px; }
.empty { text-align: center; padding: 46px 10px; color: var(--text-dim); }
.empty-logo { font-size: 46px; }
.empty h2 { color: var(--text); font-size: 21px; margin: 10px 0 6px; }
.empty p { margin: 0 0 18px; font-size: 13.5px; }
.empty-cards { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.empty-card {
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text);
  border-radius: 10px; padding: 9px 14px; font-size: 13px;
}
.empty-card:hover { border-color: var(--accent); color: var(--accent); }

.msg { display: flex; gap: 11px; margin-bottom: 20px; align-items: flex-start; }
.msg .avatar {
  width: 28px; height: 28px; flex: 0 0 28px; border-radius: 8px; display: flex;
  align-items: center; justify-content: center; font-size: 15px; background: var(--bg-hover);
}
.msg.user { flex-direction: row-reverse; }
.msg .body { max-width: 78%; min-width: 0; }
.msg .role { font-size: 11.5px; color: var(--text-dim); margin-bottom: 5px; }
.msg.user .role { text-align: right; }
.bubble {
  border-radius: 14px; padding: 10px 13px; background: var(--bubble-ai);
  border: 1px solid var(--border); line-height: 1.66; word-wrap: break-word; overflow-wrap: anywhere;
}
.msg.user .bubble { background: var(--bubble-user); color: var(--bubble-user-text); border-color: transparent; }
.bubble.error { border-color: var(--danger); color: var(--danger); }
.bubble p { margin: 0 0 9px; } .bubble p:last-child { margin-bottom: 0; }
.bubble pre {
  background: rgba(127, 137, 160, .14); border: 1px solid var(--border); border-radius: 9px;
  padding: 10px 12px; overflow-x: auto; margin: 9px 0; position: relative;
}
.msg.user .bubble pre { background: rgba(0, 0, 0, .18); border-color: rgba(255,255,255,.16); }
.bubble code { font-family: "Cascadia Code", Consolas, "SF Mono", Menlo, monospace; font-size: 12.7px; }
.bubble :not(pre) > code { background: rgba(127,137,160,.18); padding: 1.5px 5px; border-radius: 5px; }
.bubble table { border-collapse: collapse; margin: 9px 0; width: 100%; font-size: 13px; }
.bubble th, .bubble td { border: 1px solid var(--border); padding: 6px 9px; text-align: left; }
.bubble blockquote { margin: 9px 0; padding: 2px 12px; border-left: 3px solid var(--border); color: var(--text-dim); }
.bubble a { color: var(--accent); }
/* ---- code block: header bar with a copy button ---- */
.code-wrap {
  margin: 10px 0; border: 1px solid var(--border); border-radius: 10px;
  overflow: hidden; background: rgba(127, 137, 160, .10);
}
.code-head {
  display: flex; align-items: center; gap: 8px; padding: 5px 10px;
  border-bottom: 1px solid var(--border); background: rgba(127, 137, 160, .10);
}
.code-lang { font-size: 11.5px; font-weight: 600; color: var(--text-dim); text-transform: lowercase; }
.code-meta { font-size: 11px; color: var(--text-dim); margin-left: auto; }
.code-copy, .table-copy {
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text-dim);
  border-radius: 6px; padding: 2px 10px; font-size: 11.5px; line-height: 1.6; white-space: nowrap;
}
.code-copy:hover, .table-copy:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.code-copy:active, .table-copy:active { transform: translateY(1px); }
.code-wrap pre {
  margin: 0; border: none; border-radius: 0; background: transparent; padding: 10px 12px;
}
.msg.user .bubble .code-wrap { background: rgba(0, 0, 0, .16); border-color: rgba(255, 255, 255, .18); }
.msg.user .bubble .code-head { background: rgba(0, 0, 0, .16); border-color: rgba(255, 255, 255, .18); }
.msg.user .bubble .code-copy, .msg.user .bubble .table-copy {
  background: rgba(255, 255, 255, .14); border-color: rgba(255, 255, 255, .24); color: #fff;
}
.msg.user .bubble .code-lang, .msg.user .bubble .code-meta,
.msg.user .bubble .table-meta { color: rgba(255, 255, 255, .8); }

/* ---- table: header bar with a copy button ---- */
.table-wrap {
  margin: 10px 0; border: 1px solid var(--border); border-radius: 10px; overflow: hidden;
}
.table-head {
  display: flex; align-items: center; padding: 5px 10px;
  border-bottom: 1px solid var(--border); background: rgba(127, 137, 160, .10);
}
.table-meta { font-size: 11px; color: var(--text-dim); margin-right: auto; }
.table-wrap table { margin: 0; border: none; width: 100%; }
.table-wrap th, .table-wrap td { border-left: none; border-right: none; }
.table-wrap tr > *:first-child { border-left: none; }
.table-wrap tr > *:last-child { border-right: none; }
.table-wrap thead th { background: rgba(127, 137, 160, .10); }

.msg-actions { display: flex; gap: 4px; margin-top: 6px; opacity: 0; transition: opacity .15s; }
.msg:hover .msg-actions { opacity: 1; }
.msg.user .msg-actions { justify-content: flex-end; }
.mini-btn {
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text-dim);
  font-size: 11.5px; border-radius: 6px; padding: 3px 8px;
}
.mini-btn:hover { color: var(--accent); border-color: var(--accent); }

.msg-files { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 7px; }
.msg.user .msg-files { justify-content: flex-end; }
.file-chip {
  display: flex; align-items: center; gap: 6px; font-size: 12px; padding: 5px 9px;
  border-radius: 8px; background: var(--bg-elev); border: 1px solid var(--border); color: var(--text);
  max-width: 240px;
}
.msg.user .file-chip { background: rgba(255,255,255,.16); border-color: rgba(255,255,255,.22); color: #fff; }
.file-chip .nm { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-chip img { width: 34px; height: 34px; object-fit: cover; border-radius: 6px; }
.file-chip.doc { cursor: pointer; }

.reasoning {
  border: 1px dashed var(--border); border-radius: 10px; margin-bottom: 8px;
  background: rgba(127, 137, 160, .07); overflow: hidden;
}
.reasoning summary {
  cursor: pointer; padding: 7px 11px; font-size: 12.5px; color: var(--text-dim);
  list-style: none; user-select: none;
}
.reasoning summary::-webkit-details-marker { display: none; }
.reasoning summary::before { content: "🧠 "; }
.reasoning[open] summary { border-bottom: 1px dashed var(--border); }
.reasoning .r-body { padding: 9px 12px; font-size: 12.8px; color: var(--text-dim); white-space: pre-wrap; line-height: 1.6; max-height: 340px; overflow-y: auto; }

.cursor::after {
  content: "▍"; color: var(--accent); animation: blink 1s steps(2) infinite; margin-left: 1px;
}
@keyframes blink { 50% { opacity: 0; } }
.typing { display: inline-flex; gap: 4px; padding: 3px 0; }
.typing i { width: 6px; height: 6px; border-radius: 50%; background: var(--text-dim); animation: bounce 1.2s infinite; }
.typing i:nth-child(2) { animation-delay: .15s; } .typing i:nth-child(3) { animation-delay: .3s; }
@keyframes bounce { 0%, 60%, 100% { transform: translateY(0); opacity: .45; } 30% { transform: translateY(-4px); opacity: 1; } }

/* ---------------- composer ---------------- */
.composer-wrap { padding: 6px 18px 12px; background: linear-gradient(to top, var(--bg) 72%, transparent); }
.composer {
  max-width: 860px; margin: 0 auto; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 16px; padding: 8px 10px 8px; box-shadow: var(--shadow);
}
.composer.dragover { border-color: var(--accent); background: var(--accent-soft); }
.composer:focus-within { border-color: var(--accent); }
.input-row { display: flex; align-items: flex-end; gap: 6px; }
#input {
  flex: 1; border: none; background: transparent; resize: none; outline: none;
  max-height: 220px; line-height: 1.55; padding: 8px 4px; font-size: 14px;
}
.send-btn {
  border: none; background: var(--accent); color: #fff; border-radius: 10px;
  padding: 8px 16px; font-size: 13.5px; font-weight: 500; white-space: nowrap;
}
.send-btn:hover { filter: brightness(1.07); }
.send-btn:disabled { opacity: .5; cursor: not-allowed; }
.stop { background: var(--danger); }
.attach { font-size: 17px; }
.attachments { display: flex; flex-wrap: wrap; gap: 7px; padding: 2px 2px 4px; }
.attachments:empty { display: none; }
.att {
  display: flex; align-items: center; gap: 7px; border: 1px solid var(--border);
  border-radius: 9px; padding: 5px 8px; font-size: 12px; background: var(--bg);
  max-width: 250px;
}
.att img { width: 30px; height: 30px; border-radius: 5px; object-fit: cover; }
.att .nm { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.att .rm { border: none; background: transparent; color: var(--text-dim); font-size: 14px; }
.att .rm:hover { color: var(--danger); }
.att .badge { font-size: 10px; color: var(--text-dim); border: 1px solid var(--border); border-radius: 5px; padding: 0 4px; }
.att.error { border-color: var(--danger); color: var(--danger); }
.foot-hint { max-width: 860px; margin: 6px auto 0; text-align: center; font-size: 11.5px; color: var(--text-dim); }

/* ---------------- modal ---------------- */
.modal-mask {
  position: fixed; inset: 0; background: rgba(9, 11, 15, .5); z-index: 100;
  display: flex; align-items: center; justify-content: center; padding: 22px;
  backdrop-filter: blur(2px);
}
.modal {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 16px;
  width: 100%; max-width: 660px; max-height: 88vh; display: flex; flex-direction: column;
  box-shadow: var(--shadow);
}
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.modal-head h3 { margin: 0; font-size: 15.5px; }
.modal-body { padding: 16px 18px; overflow-y: auto; }
.modal-foot { display: flex; justify-content: flex-end; gap: 9px; padding: 12px 18px; border-top: 1px solid var(--border); }
.group { margin-bottom: 22px; }
.group:last-child { margin-bottom: 4px; }
.group h4 { margin: 0 0 10px; font-size: 13px; color: var(--text-dim); font-weight: 600; letter-spacing: .3px; }
.field { display: block; margin-bottom: 12px; }
.field > span { display: block; font-size: 12.5px; color: var(--text-dim); margin-bottom: 5px; }
.field-hint { display: block; margin-top: 5px; font-style: normal; font-size: 11.5px; color: var(--text-dim); word-break: break-all; }
.field-hint code { background: var(--bg-hover); padding: 1px 5px; border-radius: 4px; font-size: 11px; }
.field > span em { font-style: normal; color: var(--accent); margin-left: 6px; font-size: 11.5px; }
.field input[type="text"], .field input[type="password"], .field input[type="number"],
.field input:not([type]), .field textarea, .field select, .model-add input {
  width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 9px;
  background: var(--bg); outline: none;
}
.field input:focus, .field textarea:focus, .field select:focus, .model-add input:focus { border-color: var(--accent); }
.field textarea { resize: vertical; line-height: 1.55; }
.field input[type="range"] { width: 100%; accent-color: var(--accent); }
.field.checkbox { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.field.checkbox span { margin: 0; color: var(--text); font-size: 13px; }
.row { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.row .grow { flex: 1; min-width: 150px; }
.range-labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-dim); margin-top: 2px; }
.quick-presets { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 12px; }
.chip {
  border: 1px solid var(--border); background: var(--bg); color: var(--text-dim);
  border-radius: 20px; padding: 4px 11px; font-size: 12px;
}
.chip:hover { color: var(--accent); border-color: var(--accent); }
.model-add { margin-bottom: 10px; }
.model-add input { flex: 1; }
.model-manage { max-height: 220px; overflow-y: auto; border: 1px solid var(--border); border-radius: 10px; }
.model-manage:empty::after { content: "还没有添加模型"; display: block; padding: 14px; text-align: center; color: var(--text-dim); font-size: 12.5px; }
.mm-item { display: flex; align-items: center; gap: 8px; padding: 7px 10px; border-bottom: 1px solid var(--border); font-size: 13px; }
.mm-item:last-child { border-bottom: none; }
.mm-item .mid { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mm-item .tag { font-size: 10.5px; color: var(--text-dim); border: 1px solid var(--border); border-radius: 5px; padding: 0 5px; }
.test-result { font-size: 12.5px; color: var(--text-dim); }

/* ---------------- toast ---------------- */
.toast-wrap { position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; align-items: center; }
.toast {
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--text);
  padding: 9px 15px; border-radius: 10px; font-size: 13px; box-shadow: var(--shadow);
  animation: rise .18s ease-out; max-width: 70vw;
}
.toast.err { border-color: var(--danger); color: var(--danger); }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }

.only-mobile { display: none; }
@media (max-width: 760px) {
  .sidebar { position: fixed; z-index: 60; height: 100%; transform: translateX(-100%); transition: transform .2s; }
  .sidebar.open { transform: none; box-shadow: var(--shadow); }
  .only-mobile { display: inline-block; }
  .msg .body { max-width: 88%; }
  .field-inline { display: none; }
}