:root {
  --accent: deeppink;
  --white: #fff;
  --gray-50: #f7f7f7;
  --gray-100: #efefef;
  --gray-200: #dedede;
  --gray-300: #c9c9c9;
  --gray-500: #777;
  --gray-700: #333;
  --gray-850: #191919;
  --black: #000;
  --radius: 18px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
*::selection { background: var(--accent); color: #fff; }

body {
  --bg: var(--gray-50);
  --panel: var(--white);
  --panel-2: var(--gray-100);
  --line: var(--gray-200);
  --text: var(--black);
  --muted: var(--gray-500);
  --placeholder: var(--muted);
  margin: 0;
  min-height: 100vh;
  overflow: hidden;
  background: var(--gray-50);
  color: var(--black);
}

.login-page {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 22px;
  background: var(--bg);
  color: var(--text);
}
.login-card {
  display: grid;
  gap: 16px;
  width: min(380px, 100%);
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: 0 24px 80px rgba(0,0,0,.18);
}
.login-card .brand-mark { width: min(260px, 72vw); height: auto; justify-self: center; user-select: none; }
.login-card h1 { margin: 0; text-align: center; }
.login-card label { display: grid; gap: 7px; font-weight: 700; }
.login-card input {
  width: 100%;
  padding: 12px 13px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  outline: none;
}
.login-card input:focus { border-color: var(--accent); }
.login-card button {
  padding: 12px 14px;
  border: 1px solid var(--accent);
  border-radius: 14px;
  background: var(--accent);
  color: white;
  cursor: pointer;
}
.login-error { margin: 0; color: #ff6f7d; font-weight: 700; }

body[data-theme="dark"] {
  --accent: #5e81ac;
  --bg: #2e3440;
  --panel: #3b4252;
  --panel-2: #434c5e;
  --line: #4c566a;
  --text: #eceff4;
  --muted: #d8dee9;
  --placeholder: #b8c0cc;
  background: var(--bg);
  color: var(--text);
}

body.tree-open { overflow: hidden; }
body.tree-open .app-shell { height: 100vh; overflow: hidden; pointer-events: none; }

button, textarea, input { font: inherit; }
button { color: inherit; user-select: none; -webkit-user-select: none; }

.app-shell {
  --bg: var(--gray-50);
  --panel: var(--white);
  --panel-2: var(--gray-100);
  --line: var(--gray-200);
  --text: var(--black);
  --muted: var(--gray-500);
  --placeholder: var(--muted);
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  height: 100vh;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
}

.app-shell[data-theme="dark"] {
  --accent: #5e81ac;
  --bg: #2e3440;
  --panel: #3b4252;
  --panel-2: #434c5e;
  --line: #4c566a;
  --text: #eceff4;
  --muted: #d8dee9;
  --placeholder: #b8c0cc;
}

.sidebar {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  height: 100vh;
  min-height: 0;
  overflow: hidden;
  padding: 18px;
  border-right: 1px solid var(--line);
  background: var(--panel);
}
.sidebar::before, .sidebar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  z-index: 4;
  height: 18px;
  pointer-events: none;
  opacity: 0;
  transition: opacity .12s ease;
}
.sidebar::before { top: var(--chat-list-top, 0); background: linear-gradient(to bottom, rgba(0,0,0,.14), transparent 72%); }
.sidebar::after { top: calc(var(--chat-list-bottom, 100%) - 18px); background: linear-gradient(to top, rgba(0,0,0,.14), transparent 72%); }
.sidebar.sidebar-shadow-top::before, .sidebar.sidebar-shadow-bottom::after { opacity: 1; }

.brand { display: grid; gap: 10px; border-bottom: 2px solid var(--text); padding-bottom: 14px; }
.brand-mark { display: block; width: 100%; height: auto; user-select: none; -webkit-user-drag: none; }
.brand p { margin: 0; color: var(--muted); font-size: 14px; }
.brand-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

.new-chat, .settings-button, .model-button, .icon-button, .keep-button, .special-button {
  border: 1px solid var(--line);
  background: var(--panel-2);
  border-radius: 999px;
  cursor: pointer;
}

.new-chat, .settings-button { padding: 11px 14px; text-align: left; }
.new-chat {
  display: grid;
  place-items: center;
  height: 42px;
  padding: 0;
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
  color: var(--text);
  font-size: 26px;
  line-height: 1;
  text-align: center;
}
.settings-button { display: flex; align-items: center; gap: 9px; border-radius: 14px; background: var(--panel); box-shadow: 0 1px 4px rgba(0,0,0,.06); color: var(--text); }
.settings-button svg { width: 19px; height: 19px; flex: 0 0 auto; }
.new-chat:hover, .settings-button:hover { border-color: var(--accent); }
.search-chat svg { width: 20px; height: 20px; }
.settings-button { margin-top: auto; }

.chat-list { display: flex; flex: 1 1 auto; flex-direction: column; gap: 8px; min-height: 0; overflow: auto; }
.chat-list { scrollbar-width: thin; scrollbar-color: transparent transparent; }
.chat-list:hover, .chat-list:focus-within { scrollbar-color: color-mix(in srgb, var(--muted) 45%, transparent) transparent; }
.chat-list::-webkit-scrollbar { width: 8px; height: 8px; }
.chat-list::-webkit-scrollbar-track { background: transparent; }
.chat-list::-webkit-scrollbar-thumb { background: transparent; border-radius: 999px; }
.chat-list:hover::-webkit-scrollbar-thumb, .chat-list:focus-within::-webkit-scrollbar-thumb { background: color-mix(in srgb, var(--muted) 35%, transparent); }
.chat-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 34px;
  align-items: center;
  gap: 6px;
  padding: 8px 8px 8px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.chat-item.active { background: color-mix(in srgb, var(--accent) 10%, var(--panel)); box-shadow: inset 0 0 0 2px var(--accent), 0 1px 4px rgba(0,0,0,.06); }
.chat-title { overflow: hidden; padding: 0; border: 0; background: transparent; color: inherit; text-align: left; text-overflow: ellipsis; white-space: nowrap; cursor: pointer; }
.chat-menu-button {
  display: grid;
  place-items: center;
  height: 30px;
  width: 30px;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  line-height: 1;
}
.chat-menu-button:hover, .chat-menu-button:focus-visible { background: color-mix(in srgb, var(--text) 12%, transparent); color: var(--text); outline: none; }
.chat-menu {
  position: absolute;
  right: 0;
  top: 40px;
  z-index: 1000;
  display: none;
  min-width: 116px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: -10px 18px 28px rgba(0,0,0,.16);
}
.chat-item.menu-open { z-index: 1000; }
.chat-item.menu-open .chat-menu { display: block; }
.chat-item.menu-above .chat-menu { top: auto; bottom: 40px; box-shadow: -6px -8px 18px rgba(0,0,0,.14); }
.chat-menu button { display: block; width: 100%; padding: 8px; border: 0; border-radius: 8px; background: transparent; text-align: left; cursor: pointer; }
.chat-menu button:hover { background: var(--panel-2); }
.chat-menu button[data-action="delete"] { color: #ff6f7d; }
.chat-menu button[data-action="delete"]:hover { background: rgba(255, 111, 125, .14); color: #ff8a8a; }

.search-overlay { z-index: 15; background: var(--bg); color: var(--text); }
.search-page { display: grid; grid-template-rows: auto auto minmax(0, 1fr); gap: 14px; width: min(920px, 100%); height: 100%; margin: 0 auto; padding: 56px 24px 32px; }
.search-field { position: relative; display: block; }
.search-field svg { position: absolute; left: 16px; top: 50%; width: 22px; height: 22px; color: var(--muted); transform: translateY(-50%); pointer-events: none; }
.search-field input { width: 100%; padding: 16px 18px 16px 48px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); color: var(--text); font-size: 18px; box-shadow: 0 12px 30px rgba(0,0,0,.08); }
.search-field input:focus { border-color: var(--accent); outline: 1px solid var(--accent); outline-offset: 0; }
.search-tags, .selected-tags, .tag-choice-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-filter, .tag-chip, .tag-choice { display: inline-flex; align-items: center; gap: 6px; max-width: 100%; padding: 5px 10px; border: 1px solid var(--line); border-radius: 999px; background: var(--panel); color: var(--muted); line-height: 1.2; }
.tag-filter, .tag-choice, .tag-chip.removable { cursor: pointer; }
.tag-filter.active, .tag-choice.active, .tag-chip { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); background: color-mix(in srgb, var(--accent) 12%, var(--panel)); color: var(--text); }
.search-results { min-height: 0; overflow: auto; display: flex; flex-direction: column; gap: 10px; padding-right: 4px; }
.search-result { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 14px; width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); color: var(--text); text-align: left; cursor: pointer; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
.search-result:hover, .search-result:focus-visible { border-color: var(--accent); outline: none; }
.search-result.active { box-shadow: inset 0 0 0 2px var(--accent), 0 1px 4px rgba(0,0,0,.06); }
.search-result-main { display: grid; min-width: 0; gap: 7px; }
.search-result-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 650; }
.search-result-tags { display: flex; flex-wrap: wrap; gap: 6px; min-width: 0; }
.search-result time { color: var(--muted); font-size: 13px; white-space: nowrap; }
.search-empty, .tag-empty { color: var(--muted); }
.tag-editor { display: grid; gap: 14px; }
.tag-editor label { display: grid; gap: 7px; color: var(--muted); }
.tag-add-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.tag-add-row button { padding: 0 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel-2); cursor: pointer; }
.tag-add-row button.ready { border-color: var(--accent); background: var(--accent); color: #fff; }

.chat-pane { position: relative; display: grid; grid-template-rows: minmax(0, 1fr) auto; min-width: 0; height: 100vh; min-height: 0; overflow: hidden; }
.avatar { display: grid; place-items: center; width: 36px; height: 36px; overflow: hidden; border: 1px solid var(--line); border-radius: 50%; background: var(--panel); }
.avatar img { width: 100%; height: 100%; object-fit: cover; }

.messages { min-height: 0; overflow: auto; scrollbar-gutter: stable; padding: 16px 6vw 28px; }
.jump-bottom {
  position: absolute;
  right: max(24px, 6vw);
  bottom: 92px;
  z-index: 4;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(0,0,0,.18);
}
.jump-bottom svg { width: 20px; height: 20px; }
.jump-bottom:hover, .jump-bottom:focus-visible { border-color: var(--accent); color: var(--accent); outline: none; }
.app-shell[data-theme="dark"] .jump-bottom { color: var(--accent); }
.app-shell[data-theme="dark"] .jump-bottom:hover, .app-shell[data-theme="dark"] .jump-bottom:focus-visible { color: #fff; }
.empty-state { display: grid; place-items: center; height: 100%; color: var(--muted); text-align: center; }
.empty-logo { width: min(230px, 64vw); height: auto; margin: 0 auto 6px; color: var(--text); }
.empty-state p { margin-top: 0; }
.loading-messages { width: 100%; }
.loading-pair { opacity: .86; }
.loading-card { padding: 18px 16px; pointer-events: none; }
.loading-line {
  height: 12px;
  margin-bottom: 11px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--panel-2) 0%, color-mix(in srgb, var(--panel-2), var(--text) 10%) 45%, var(--panel-2) 90%);
  background-size: 220% 100%;
  animation: loading-strobe 1.15s ease-in-out infinite;
}
.loading-line:last-child { margin-bottom: 0; }
.loading-line.short { width: 34%; }
.loading-line.title { width: 22%; }
.loading-line.wide { width: 76%; }
@keyframes loading-strobe {
  0% { background-position: 120% 0; }
  100% { background-position: -120% 0; }
}
.message-pair { display: grid; gap: 12px; width: 100%; min-width: 0; margin: 0 auto 12px; max-width: 920px; }
.message-card { position: relative; min-width: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); overflow: visible; transition: box-shadow .14s ease; }
.message-card.recently-collapsed { border-color: var(--accent); }
.message-card.expanded:has(.message-edge-collapse:hover),
.message-card.expanded:has(.message-edge-collapse:focus-visible) {
  box-shadow: inset -5px 0 0 var(--accent);
}
.message-edge-collapse {
  display: none;
  position: absolute;
  top: 0;
  right: -12px;
  bottom: 0;
  z-index: 3;
  width: 26px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}
.message-card.expanded .message-edge-collapse { display: block; }
.message-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 10px;
  row-gap: 4px;
  width: 100%;
  padding: 10px 14px;
  border: 0;
  background: transparent;
  cursor: pointer;
  text-align: left;
}
.message-meta { display: grid; grid-template-columns: auto minmax(0, 1fr); grid-column: 1; align-items: center; gap: 9px; min-width: 0; }
.message-meta:not(:has(.message-avatar)) { grid-template-columns: minmax(0, 1fr); }
.message-avatar {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--panel-2);
  color: var(--text);
  font-size: 13px;
  font-weight: 800;
}
.message-avatar img { width: 100%; height: 100%; object-fit: cover; }
.message-avatar { grid-column: 1; grid-row: 1; }
.message-role { grid-row: 1; min-width: 0; overflow: hidden; font-weight: 700; text-overflow: ellipsis; white-space: nowrap; }
.message-meta:has(.message-avatar) .message-role { grid-column: 2; }
.message-preview { grid-column: 1 / -1; grid-row: 2; min-width: 0; overflow: hidden; color: var(--muted); text-overflow: ellipsis; white-space: nowrap; }
.message-tools { grid-column: 2; grid-row: 1; display: flex; flex: 0 0 auto; align-items: center; gap: 8px; }
.arrow { transition: transform .16s ease; }
.message-card.expanded .arrow { transform: rotate(90deg); }
.message-body { display: none; min-width: 0; padding: 0 14px 14px; white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.55; }
.message-card.expanded .message-body { display: block; }
.queued-output { margin: 0; color: var(--muted); font-style: italic; }
.message-body h1, .message-body h2, .message-body h3, .message-body h4, .message-body h5, .message-body h6 { margin: 16px 0 8px; line-height: 1.2; white-space: normal; }
.message-body h1 { font-size: 1.55rem; }
.message-body h2 { font-size: 1.35rem; }
.message-body h3 { font-size: 1.16rem; }
.message-body h4, .message-body h5, .message-body h6 { font-size: 1rem; }
.message-body code {
  padding: 2px 5px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-2);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .92em;
}
.message-body code.inline-code { cursor: pointer; transition: border-color .15s ease, color .15s ease; }
.message-body code.inline-code:hover { border-color: var(--accent); }
.message-body code.inline-code.copied { color: var(--accent); border-color: var(--accent); }
.code-block { position: relative; min-width: 0; margin: 12px 0; overflow-wrap: normal; }
.message-body pre { overflow: auto; margin: 0; padding: 12px 52px 12px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel-2); white-space: pre; }
.message-body pre code { padding: 0; border: 0; border-radius: 0; background: transparent; overflow-wrap: normal; }
.copy-code {
  position: absolute;
  top: 8px;
  right: 8px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,.12);
}
.copy-code svg { width: 17px; height: 17px; }
.copy-code.copied { color: var(--accent); border-color: var(--accent); }
.copy-code:hover { border-color: var(--accent); }
.markdown-table-wrap { position: relative; overflow: auto; margin: 12px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.markdown-table-wrap table { width: 100%; border-collapse: collapse; white-space: normal; }
.copy-table-csv {
  position: sticky;
  top: 8px;
  left: calc(100% - 38px);
  z-index: 2;
  display: grid;
  place-items: center;
  float: right;
  width: 30px;
  height: 30px;
  margin: 8px 8px -38px 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,.12);
}
.copy-table-csv svg { width: 17px; height: 17px; }
.copy-table-csv.copied { color: var(--accent); border-color: var(--accent); }
.copy-table-csv:hover { border-color: var(--accent); }
.markdown-table-wrap th, .markdown-table-wrap td { padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.markdown-table-wrap th { background: var(--panel-2); font-weight: 800; }
.markdown-table-wrap tr:last-child td { border-bottom: 0; }
.markdown-table-wrap tbody tr:nth-child(even) { background: color-mix(in srgb, var(--panel-2) 42%, transparent); }
.copy-message-button, .edit-button, .refresh-button { display: grid; place-items: center; width: 26px; height: 26px; padding: 0; border: 0; border-radius: 8px; background: transparent; cursor: pointer; color: var(--muted); }
.copy-message-button:hover, .edit-button:hover, .refresh-button:hover { background: color-mix(in srgb, var(--text) 10%, transparent); color: var(--text); }
.copy-message-button.copied { color: var(--accent); }
.refresh-button:disabled { cursor: default; opacity: .45; }
.refresh-button:disabled:hover { background: transparent; color: var(--muted); }
.edit-box {
  width: 100%;
  min-height: 100px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  padding: 10px;
  outline: none;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.edit-box:focus { border-color: var(--accent); }
.edit-attachments { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.edit-attachment-placeholder { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--panel-2); color: var(--muted); font-size: 10px; }
.edit-attachment-add { display: grid; place-items: center; width: 40px; height: 40px; padding: 0; border: 1px dashed var(--line); border-radius: 12px; background: var(--panel); color: var(--muted); cursor: pointer; font-size: 22px; line-height: 1; }
.edit-attachment-add:hover { border-color: var(--accent); color: var(--accent); }
.inline-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }
.thinking {
  position: relative;
  margin-bottom: 14px;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--accent) 36%, var(--line));
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 8%, var(--panel));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 8%, transparent);
}
.thinking::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--accent);
  pointer-events: none;
}
.thinking-edge-collapse {
  display: none;
  position: absolute;
  inset: 0 auto 0 0;
  z-index: 2;
  width: 18px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}
.thinking[open] .thinking-edge-collapse { display: block; }
.thinking[open]:has(.thinking-edge-collapse:hover),
.thinking[open]:has(.thinking-edge-collapse:focus-visible) {
  box-shadow: inset 5px 0 0 var(--accent), inset 0 0 0 1px color-mix(in srgb, var(--accent) 8%, transparent);
}
.thinking summary { cursor: pointer; padding: 8px 12px; color: var(--accent); font-weight: 800; letter-spacing: .02em; user-select: none; }
.thinking.active-thinking summary,
.message-preview.active-thinking {
  animation: connecting-strobe 1.8s ease-in-out infinite;
}
.message-preview.active-thinking {
  color: var(--accent);
  font-weight: 400;
}
.thinking > div {
  padding: 0 12px 12px;
  color: color-mix(in srgb, var(--muted) 84%, var(--text));
  font-size: .94em;
}
.connecting-placeholder {
  color: var(--muted);
  animation: connecting-strobe 1.8s ease-in-out infinite;
}
@keyframes connecting-strobe {
  0%, 100% { opacity: .42; }
  50% { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .connecting-placeholder,
  .thinking.active-thinking summary,
  .message-preview.active-thinking { animation: none; }
}

.composer {
  position: sticky;
  bottom: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto 44px auto minmax(146px, auto) 44px;
  align-items: center;
  gap: 10px;
  padding: 13px 20px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, transparent, var(--bg) 18%);
}
.composer textarea {
  min-height: 48px;
  max-height: 180px;
  overflow-y: hidden;
  resize: none;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel);
  color: var(--text);
  padding: 14px 16px;
  outline: none;
}
.composer textarea:focus { border-color: var(--accent); }
.composer textarea::placeholder { color: var(--placeholder); opacity: 1; }
.composer textarea { grid-column: 1; grid-row: 1; }
.composer-actions { display: contents; }
.composer-actions .keep-button { grid-column: 2; grid-row: 1; align-self: center; }
.special-actions { position: relative; grid-column: 3; grid-row: 1; align-self: center; }
.special-actions .special-button { width: 44px; height: 40px; border-radius: 14px; background: var(--panel); }
.special-button span { font-size: 22px; line-height: 1; transform: translateY(-1px); }
.special-menu {
  position: absolute;
  right: 0;
  bottom: calc(100% + 8px);
  z-index: 9;
  display: none;
  min-width: 174px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 14px 34px rgba(0,0,0,.18);
}
.special-actions.menu-open .special-menu { display: block; }
.special-menu button { display: flex; align-items: center; gap: 9px; width: 100%; padding: 9px 10px; border: 0; border-radius: 8px; background: transparent; color: var(--text); text-align: left; cursor: pointer; }
.special-menu button svg { flex: 0 0 auto; width: 18px; height: 18px; color: var(--muted); }
.special-menu button span { white-space: nowrap; }
.special-menu button:hover svg { color: var(--accent); }
.special-menu button:hover { background: var(--panel-2); }
.composer-actions .icon-button { grid-column: 4; grid-row: 1; align-self: center; }
.composer-actions .model-toggle { grid-column: 5; grid-row: 1; align-self: center; }
.composer.no-keep .special-actions { grid-column: 2; }
.composer.no-keep .composer-actions .icon-button { grid-column: 3; }
.composer.no-keep .composer-actions .model-toggle { grid-column: 4 / 6; }
.composer.no-tree .composer-actions .model-toggle { grid-column: 4 / 6; }
.composer.no-keep.no-tree .composer-actions .model-toggle { grid-column: 3 / 6; }
.pending-attachments { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 8px; margin-top: -2px; }
.pending-attachment { display: inline-flex; align-items: center; gap: 7px; max-width: 220px; padding: 5px 7px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); color: var(--text); font-size: 12px; }
.pending-attachment img { width: 28px; height: 28px; border-radius: 8px; object-fit: cover; }
.pending-attachment span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pending-attachment button { display: grid; place-items: center; width: 22px; height: 22px; padding: 0; border: 0; border-radius: 999px; background: var(--panel-2); color: var(--text); cursor: pointer; }
.attachment-strip { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.attachment-thumb { display: grid; gap: 5px; width: 104px; padding: 7px; border: 1px solid var(--line); border-radius: 13px; background: var(--panel-2); color: var(--text); text-decoration: none; white-space: normal; }
.attachment-thumb:hover { border-color: var(--accent); }
.attachment-thumb img { width: 88px; height: 68px; border-radius: 9px; object-fit: cover; }
.attachment-placeholder { display: grid; place-items: center; width: 88px; height: 68px; border-radius: 9px; background: var(--panel); color: var(--muted); font-size: 12px; }
.attachment-thumb span { overflow: hidden; color: var(--muted); font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.send-button {
  grid-column: 6;
  grid-row: 1;
  display: grid;
  place-items: center;
  width: 44px;
  height: 40px;
  align-self: center;
  padding: 0;
  border: 1px solid var(--accent);
  border-radius: 14px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
.send-button:hover, .send-button:focus-visible { outline: none; filter: brightness(.96); }
.send-button svg { width: 20px; height: 20px; transform: translateX(1px); }
.composer-actions > .keep-button, .composer-actions > .icon-button { height: 40px; border-radius: 14px; background: var(--panel); }
.keep-button { padding: 0 13px; }
.keep-button:hover { border-color: var(--accent); }
.keep-button:disabled { cursor: default; opacity: .65; }
.icon-button { display: grid; place-items: center; width: 44px; height: 44px; padding: 0; }
.icon-button svg, .model-button svg { width: 20px; height: 20px; }
.model-toggle { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; border: 1px solid var(--line); border-radius: 999px; background: var(--panel); overflow: hidden; }
.model-toggle::before, .theme-switch::before, .save-switch::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 4px;
  width: calc((100% - 12px) / 2);
  border-radius: 999px;
  background: var(--accent);
  transform: translateX(0);
  transition: transform .18s ease;
}
.model-toggle[data-active="pro"]::before, .theme-switch[data-active="dark"]::before, .save-switch[data-active="saved"]::before { transform: translateX(calc(100% + 4px)); }
.model-button { position: relative; z-index: 1; display: flex; align-items: center; justify-content: center; gap: 5px; padding: 8px 10px; border-color: transparent; background: transparent; transition: color .18s ease; }
.model-button.active { color: white; }

.overlay, .modal-backdrop { position: fixed; inset: 0; z-index: 20; background: var(--bg); color: var(--text); }
.hidden { display: none !important; }
.close-button {
  position: fixed;
  top: calc(18px + env(safe-area-inset-top));
  right: calc(18px + env(safe-area-inset-right));
  z-index: 22;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--panel);
  color: var(--text);
  font-size: 30px;
  cursor: pointer;
}
.tree-stage { position: relative; width: 100%; height: 100%; overflow: auto; }
.tree-lines { position: absolute; inset: 0; pointer-events: none; }
.tree-link { fill: none; stroke: currentColor; stroke-width: 2; opacity: .55; }
.tree-link.active-path { stroke: var(--accent); opacity: .78; }
.tree-link.preview-path { stroke: var(--accent); stroke-width: 4; opacity: 1; }
.tree-node {
  position: absolute;
  width: 210px;
  min-height: 92px;
  padding: 12px;
  border: 2px solid var(--line);
  border-radius: 18px 18px 18px 3px;
  background: var(--panel);
  cursor: pointer;
}
.tree-node.active-branch { border-color: var(--accent); }
.tree-node.preview-path { border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 24%, transparent); }
.tree-node.current:after { content: "*"; position: absolute; right: -18px; bottom: -24px; color: var(--accent); font-size: 42px; line-height: 1; }
.tree-node strong, .tree-node span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree-node span { color: var(--muted); font-size: 13px; }

.modal-backdrop { display: grid; place-items: center; padding: 18px; background: transparent; }
.modal {
  width: min(460px, 100%);
  max-height: calc(100vh - 48px);
  overflow: auto;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 24px 80px rgba(0,0,0,.24);
}
.modal h2 { margin: 0 0 18px; }
.settings-form { display: grid; gap: 18px; }
.settings-form label { display: grid; gap: 7px; color: var(--text); font-weight: 700; }
.settings-label { display: block; margin-bottom: 7px; color: var(--text); font-weight: 700; }
.settings-help { color: var(--muted); font-size: 12px; font-weight: 500; line-height: 1.45; }
.settings-token-field { position: relative; display: block; }
.settings-token-field input { padding-right: 46px; }
.settings-token-toggle {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.settings-token-toggle:hover,
.settings-token-toggle[aria-pressed="true"] { color: var(--accent); }
.settings-token-toggle svg { width: 18px; height: 18px; }
.settings-section-title { color: var(--muted); font-size: 13px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.settings-profile-card {
  display: grid;
  justify-items: center;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.settings-avatar-preview {
  display: grid;
  place-items: center;
  width: 92px;
  height: 92px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--panel);
  color: var(--text);
  font-size: 34px;
  font-weight: 800;
}
.settings-avatar-preview img { width: 100%; height: 100%; object-fit: cover; }
.settings-avatar-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.settings-archive-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.settings-avatar-actions button, .settings-archive-actions button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.settings-archive-actions button svg { width: 18px; height: 18px; color: var(--muted); }
.settings-archive-actions button:hover svg { color: var(--accent); }
.settings-avatar-actions button:hover, .settings-archive-actions button:hover { border-color: var(--accent); }
.settings-archive-actions button:disabled { cursor: progress; opacity: .58; }
.settings-archive-actions .settings-danger-button { border-color: #ff8a8a; color: #ff6f7d; }
.settings-archive-actions .settings-danger-button:hover { border-color: #ff6f7d; background: color-mix(in srgb, #ff6f7d 12%, var(--panel)); }
.modal-actions button:disabled { cursor: not-allowed; opacity: .5; }
.archive-status { margin-top: 9px; padding: 9px 10px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); color: var(--muted); font-size: 13px; }
.archive-status::before { content: ''; display: inline-block; width: 8px; height: 8px; margin-right: 8px; border-radius: 999px; background: var(--accent); animation: pulse 1s ease-in-out infinite; vertical-align: 1px; }
.settings-profile-card .settings-avatar-actions button { background: var(--panel); }
.settings-username { margin-top: 2px; }
.settings-account-card {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--panel) 82%, var(--bg));
}
.account-list { display: grid; gap: 10px; }
.account-card {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
}
.account-heading { display: flex; align-items: center; justify-content: space-between; gap: 10px; color: var(--muted); font-size: inherit; }
.account-heading strong { color: var(--text); }
.account-delete-button {
  padding: 7px 10px;
  border: 1px solid #ff8a8a;
  border-radius: 12px;
  background: var(--panel);
  color: #ff6f7d;
  cursor: pointer;
}
.account-delete-button:hover { border-color: #ff6f7d; background: color-mix(in srgb, #ff6f7d 12%, var(--panel)); }
.account-delete-button:disabled { cursor: progress; opacity: .58; }
.account-password-field { display: grid; gap: 7px; font-weight: 700; }
.account-password-row { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 8px; }
.account-password-row button {
  display: inline-grid;
  place-items: center;
  min-width: 42px;
  padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.account-password-row button:hover { border-color: var(--accent); }
.account-password-row button svg { width: 18px; height: 18px; color: var(--muted); }
.account-password-row button:hover svg { color: var(--accent); }
.theme-switch, .save-switch {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  width: 100%;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
  overflow: hidden;
}
.theme-choice, .save-choice { position: relative; z-index: 1; padding: 10px 12px; border: 0; border-radius: 999px; background: transparent; color: var(--text); cursor: pointer; transition: color .18s ease; }
.theme-choice.active, .save-choice.active { color: white; }
.modal input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  outline: none;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.modal input::placeholder { color: var(--placeholder); opacity: 1; }
.modal input:focus { border-color: var(--accent); }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.modal-actions button, .inline-actions button {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.modal-actions button[data-primary] { border-color: var(--accent); background: var(--accent); color: white; }
.modal-actions button[data-danger] { border-color: #ff8a8a; background: #ff6f7d; color: white; }
.inline-actions button[data-save] { border-color: var(--accent); background: var(--accent); color: white; }

:is(button, select, summary, [href], [tabindex]):focus-visible {
  outline: 4px solid var(--accent) !important;
  outline-offset: 3px;
}

.mobile-only { display: none; }

@media (max-width: 1500px) {
  .messages { padding-inline: 20px; }
}

@media (max-width: 820px) {
  body { min-height: 100dvh; }
  .app-shell { grid-template-columns: 1fr; height: 100dvh; }
  .chat-pane { height: 100dvh; }
  .chat-pane::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 4;
    height: calc(58px + env(safe-area-inset-top));
    border-bottom: 1px solid var(--line);
    background: var(--bg);
    pointer-events: none;
  }
  .sidebar { position: fixed; inset: 0 auto 0 0; z-index: 10; width: min(86vw, 310px); height: 100dvh; padding-top: calc(18px + env(safe-area-inset-top)); padding-bottom: calc(18px + env(safe-area-inset-bottom)); transform: translateX(-105%); transition: transform .18s ease; box-shadow: none; }
  .sidebar.open { transform: translateX(0); }
  .mobile-only { display: grid; }
  #sidebarToggle { position: absolute; top: calc(9px + env(safe-area-inset-top)); left: 12px; z-index: 5; padding-bottom: 2px; border: 1px solid var(--line); background: var(--panel); color: var(--text); font-size: 24px; line-height: 1; box-shadow: 0 1px 4px rgba(0,0,0,.08); }
  #sidebarToggle:hover, #sidebarToggle:focus-visible { background: var(--panel); color: var(--accent); }
  .messages { padding: calc(70px + env(safe-area-inset-top)) 14px 18px; }
  .composer { grid-template-columns: minmax(0, 1fr) 46px; gap: 8px; padding: 10px 12px calc(10px + env(safe-area-inset-bottom)); }
  .composer textarea { grid-column: 1; grid-row: auto; order: 2; width: 100%; min-height: 46px; }
  .send-button { grid-column: 2; grid-row: auto; order: 3; width: 46px; height: 46px; border-radius: 15px; }
  .composer-actions { grid-column: 1 / 3; order: 1; display: grid; grid-template-columns: minmax(58px, auto) 44px 44px minmax(0, 1fr); gap: 8px; align-items: center; }
  .composer-actions .keep-button, .composer-actions .icon-button, .special-actions .special-button {
    width: 100%;
    height: 40px;
    justify-content: center;
    padding: 0 8px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--panel);
  }
  .composer-actions .keep-button { grid-column: 1; }
  .special-actions { grid-column: 2; grid-row: auto; }
  .composer-actions .icon-button { grid-column: 3; }
  .composer-actions .model-toggle { grid-column: 4; }
  .composer-actions .keep-button, .composer-actions .icon-button, .composer-actions .model-toggle { grid-row: auto; }
  .composer.no-keep .special-actions { grid-column: 1; }
  .composer.no-keep .composer-actions .icon-button { grid-column: 2; }
  .composer.no-keep .composer-actions .model-toggle, .composer.no-tree .composer-actions .model-toggle { grid-column: 3 / 5; }
  .composer.no-keep.no-tree .composer-actions .model-toggle { grid-column: 2 / 5; }
  .composer-actions .icon-button { display: grid; }
  .composer-actions .model-toggle { width: 100%; height: 40px; justify-content: stretch; }
  .composer-actions .model-button { flex: 1; justify-content: center; padding: 0 8px; }
  .special-menu { left: 0; right: auto; max-width: calc(100vw - 24px); }
  .pending-attachments { grid-column: 1 / 3; order: 2; }
  .jump-bottom { right: 18px; bottom: calc(124px + env(safe-area-inset-bottom)); }
  .tree-stage { padding: calc(78px + env(safe-area-inset-top)) 20px calc(40px + env(safe-area-inset-bottom)); }
  .search-page { padding: calc(78px + env(safe-area-inset-top)) 14px calc(24px + env(safe-area-inset-bottom)); }
  .search-result { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .search-result time { justify-self: start; }
}