:root {
  --bg: #ffffff;
  --bg-sidebar: #f7f8fa;
  --bg-hover: #eef0f4;
  --bg-active: #e8ebf2;
  --bg-input: #ffffff;
  --bg-code: #1e1e1e;
  --border: #e5e7eb;
  --text: #1f2937;
  --text-2: #6b7280;
  --text-3: #9ca3af;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: #eff6ff;
  --user-avatar: #9ca3af;
  --ai-avatar: #3b82f6;
  --danger: #ef4444;
  --success: #22c55e;
  --sidebar-w: 260px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", Consolas, monospace;
}
[data-theme="dark"] {
  --bg: #1a1b1e; --bg-sidebar: #141516; --bg-hover: #252628; --bg-active: #2c2d30;
  --bg-input: #1a1b1e; --bg-code: #0d0d0e; --border: #2e3035;
  --text: #e8eaed; --text-2: #9aa0a6; --text-3: #6b7280;
  --accent: #5b9cff; --accent-hover: #7ab0ff; --accent-soft: #1a2740;
  --user-avatar: #6b7280; --ai-avatar: #5b9cff;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; font-family: var(--font); background: var(--bg); color: var(--text); overflow: hidden; font-size: 14px; }
#app { display: flex; height: 100%; }

#sidebar { width: var(--sidebar-w); background: var(--bg-sidebar); border-right: 1px solid var(--border); display: flex; flex-direction: column; flex-shrink: 0; }
.sidebar-top { padding: 14px; display: flex; align-items: center; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 16px; }
.logo-icon { width: 28px; height: 28px; border-radius: 7px; background: linear-gradient(135deg,#f59e0b,#f97316 50%,#3b82f6); display: flex; align-items: center; justify-content: center; font-size: 14px; }
.sidebar-actions { padding: 0 10px 8px; }
.nav-btn { display: flex; align-items: center; gap: 8px; width: 100%; padding: 8px 10px; border: none; background: transparent; border-radius: 8px; color: var(--text); font-size: 13.5px; cursor: pointer; text-align: left; }
.nav-btn:hover { background: var(--bg-hover); }
.nav-btn .ico { width: 18px; text-align: center; }
.session-list { flex: 1; overflow-y: auto; padding: 4px 10px 10px; }
.session-item { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 8px; cursor: pointer; color: var(--text-2); font-size: 13.5px; }
.session-item:hover { background: var(--bg-hover); color: var(--text); }
.session-item.active { background: var(--bg-active); color: var(--text); font-weight: 500; }
.session-item .title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.session-item .del { opacity: 0; border: none; background: transparent; color: var(--text-3); cursor: pointer; font-size: 12px; padding: 2px 5px; }
.session-item:hover .del { opacity: 1; }
.session-item .del:hover { color: var(--danger); }
.sidebar-footer { padding: 8px 10px 12px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 2px; }

#main { flex: 1; display: flex; flex-direction: column; min-width: 0; background: var(--bg); }
#chat-header { height: 52px; padding: 0 16px 0 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.chat-title-wrap { flex: 1; min-width: 0; }
#chat-title { font-size: 15px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.header-actions { display: flex; gap: 8px; align-items: center; }

.model-picker-wrap { position: relative; }
.btn-model-picker { display: flex; align-items: center; gap: 6px; border: 1px solid var(--border); background: var(--bg); border-radius: 8px; padding: 6px 10px; font-size: 13px; color: var(--text); cursor: pointer; max-width: 260px; }
.btn-model-picker:hover { background: var(--bg-hover); }
.btn-model-picker .chev { color: var(--text-3); font-size: 11px; }
#current-model-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.model-dropdown { position: absolute; right: 0; top: calc(100% + 6px); width: 320px; max-height: 360px; overflow-y: auto; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,0.12); z-index: 40; padding: 6px; }
.model-dropdown.hidden { display: none; }
.dd-group { font-size: 11px; color: var(--text-3); padding: 8px 10px 4px; font-weight: 600; }
.dd-item { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 6px; cursor: pointer; font-size: 13px; }
.dd-item:hover { background: var(--bg-hover); }
.dd-item.active { background: var(--accent-soft); color: var(--accent); }
.dd-item .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); flex-shrink: 0; }
.dd-empty { padding: 16px; text-align: center; color: var(--text-3); font-size: 13px; }

.messages { flex: 1; overflow-y: auto; padding: 20px 0 12px; }
.welcome { max-width: 520px; margin: 14vh auto 0; text-align: center; color: var(--text-2); padding: 0 24px; }
.welcome-icon { width: 48px; height: 48px; margin: 0 auto 14px; border-radius: 12px; background: linear-gradient(135deg,#f59e0b,#f97316 50%,#3b82f6); display: flex; align-items: center; justify-content: center; font-size: 22px; }
.welcome h2 { color: var(--text); font-size: 20px; margin-bottom: 8px; font-weight: 600; }
.welcome p { line-height: 1.6; font-size: 13.5px; }
.welcome .hint { margin-top: 14px; font-size: 13px; color: var(--text-3); }

.message { max-width: 780px; margin: 0 auto 22px; padding: 0 24px; display: flex; gap: 12px; }
.message .avatar { width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 13px; flex-shrink: 0; color: #fff; }
.message.user .avatar { background: var(--user-avatar); }
.message.assistant .avatar { background: var(--ai-avatar); border-radius: 8px; }
.message .bubble { flex: 1; min-width: 0; line-height: 1.65; font-size: 14.5px; }
.message .content { word-break: break-word; }
.message .content p { margin-bottom: 0.7em; }
.message .content p:last-child { margin-bottom: 0; }
.message .content pre { background: var(--bg-code); color: #e5e7eb; border-radius: 8px; padding: 12px 14px; overflow-x: auto; margin: 10px 0; font-family: var(--mono); font-size: 13px; }
.message .content code { font-family: var(--mono); font-size: 0.9em; background: var(--bg-hover); padding: 1px 5px; border-radius: 4px; }
.message .content pre code { background: transparent; padding: 0; color: inherit; }
.message .content ul, .message .content ol { padding-left: 1.4em; margin-bottom: 0.7em; }
.message .content table { border-collapse: collapse; margin: 10px 0; font-size: 13.5px; width: 100%; }
.message .content th, .message .content td { border: 1px solid var(--border); padding: 6px 10px; }
.message .content th { background: var(--bg-sidebar); }
.message.error .bubble { color: var(--danger); }

#composer { border-top: 1px solid var(--border); background: var(--bg); padding: 12px 20px 16px; flex-shrink: 0; }
.composer-inner { max-width: 780px; margin: 0 auto; display: flex; gap: 10px; align-items: flex-end; background: var(--bg-input); border: 1px solid var(--border); border-radius: 12px; padding: 8px 10px 8px 14px; box-shadow: 0 1px 3px rgba(0,0,0,0.04); }
#input { flex: 1; border: none; background: transparent; color: var(--text); font-family: inherit; font-size: 14.5px; resize: none; max-height: 160px; outline: none; line-height: 1.5; padding: 6px 0; }
#input::placeholder { color: var(--text-3); }
.btn-send { width: 36px; height: 36px; border: none; border-radius: 8px; background: var(--accent); color: #fff; cursor: pointer; font-size: 15px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
.btn-send:hover:not(:disabled) { background: var(--accent-hover); }
.btn-send:disabled { opacity: 0.4; cursor: not-allowed; }
.composer-meta { max-width: 780px; margin: 6px auto 0; display: flex; justify-content: space-between; font-size: 12px; color: var(--text-3); }

.btn-ghost { background: transparent; color: var(--text-2); border: 1px solid var(--border); border-radius: 8px; padding: 5px 11px; font-size: 12.5px; cursor: pointer; }
.btn-ghost:hover { color: var(--text); background: var(--bg-hover); }
.btn-ghost.danger { color: var(--danger); border-color: #fecaca; }
.btn-primary { background: var(--accent); color: #fff; border: none; border-radius: 8px; padding: 8px 16px; font-size: 13.5px; font-weight: 500; cursor: pointer; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-icon { background: transparent; border: none; color: var(--text-2); cursor: pointer; font-size: 16px; padding: 4px 8px; border-radius: 6px; }
.btn-icon:hover { color: var(--text); background: var(--bg-hover); }

/* ===== Settings 3-column like Chatbox ===== */
.overlay { position: fixed; inset: 0; background: rgba(15,23,42,0.35); display: flex; align-items: center; justify-content: center; z-index: 100; padding: 16px; }
.overlay.hidden { display: none; }

.settings-shell {
  display: flex; width: 100%; max-width: 1080px; height: min(90vh, 760px);
  background: var(--bg); border-radius: 12px; border: 1px solid var(--border);
  box-shadow: 0 20px 50px rgba(0,0,0,0.12); overflow: hidden;
}

/* Left nav */
.settings-nav {
  width: 200px; background: var(--bg-sidebar); border-right: 1px solid var(--border);
  padding: 12px 8px; display: flex; flex-direction: column; overflow-y: auto; flex-shrink: 0;
}
.settings-nav-head { display: flex; align-items: center; justify-content: space-between; padding: 4px 8px 10px; }
.settings-nav-title { font-size: 16px; font-weight: 700; }
.settings-search { padding: 0 6px 10px; }
.settings-search input {
  width: 100%; padding: 7px 10px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text-3); font-size: 12.5px; outline: none;
}
.nav-group-label {
  font-size: 11px; color: var(--text-3); padding: 10px 10px 4px; font-weight: 500;
}
.s-nav {
  border: none; background: transparent; text-align: left; padding: 7px 10px; border-radius: 8px;
  font-size: 13px; color: var(--text-2); cursor: pointer; width: 100%;
}
.s-nav:hover { background: var(--bg-hover); color: var(--text); }
.s-nav.active { background: var(--bg-active); color: var(--text); font-weight: 600; }

/* Middle provider list column */
.settings-mid {
  width: 240px; border-right: 1px solid var(--border); background: var(--bg);
  display: flex; flex-direction: column; flex-shrink: 0;
}
.settings-mid.hidden { display: none; }
.mid-pane { display: flex; flex-direction: column; height: 100%; }
.mid-pane.hidden { display: none; }
.mid-list { flex: 1; overflow-y: auto; padding: 8px 6px; }
.mid-empty { padding: 40px 16px; text-align: center; color: var(--text-3); font-size: 13px; }

.provider-row {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 10px;
  cursor: pointer; margin-bottom: 2px;
}
.provider-row:hover { background: var(--bg-hover); }
.provider-row.active { background: var(--accent-soft); }
.provider-row .picon {
  width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; color: #fff; flex-shrink: 0;
}
.provider-row .pname { flex: 1; font-size: 13.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.provider-row .pdot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-3); flex-shrink: 0; }
.provider-row .pdot.on { background: var(--success); }

.btn-add-provider {
  margin: 8px 12px 12px; padding: 8px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); color: var(--accent); font-size: 13.5px; cursor: pointer; font-weight: 500;
}
.btn-add-provider:hover { background: var(--accent-soft); }

/* Right detail */
.settings-body { flex: 1; overflow-y: auto; padding: 24px 28px; min-width: 0; }
.s-panel h2 { font-size: 18px; font-weight: 600; margin-bottom: 12px; }
.s-panel.hidden { display: none; }
.s-desc { font-size: 13px; color: var(--text-2); line-height: 1.55; margin-bottom: 14px; }
.provider-detail-empty { padding: 48px 12px; text-align: center; color: var(--text-2); }
.provider-detail-empty.hidden { display: none; }
#provider-detail.hidden { display: none; }
.pd-actions { display: flex; align-items: center; gap: 8px; margin-top: 16px; }

.field { display: block; font-size: 13px; color: var(--text-2); margin-bottom: 14px; }
.field input, .field textarea, .field select {
  display: block; width: 100%; margin-top: 5px; padding: 8px 11px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text); font-family: inherit; font-size: 13.5px; outline: none;
}
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--accent); }
.field textarea { resize: vertical; min-height: 80px; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.checkbox { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 13.5px; color: var(--text); margin-bottom: 10px; }

.mobile-only { display: none; }
@media (max-width: 900px) {
  .settings-shell { flex-direction: column; height: 95vh; max-width: 100%; }
  .settings-nav { width: 100%; max-height: 160px; flex-direction: row; flex-wrap: wrap; border-right: none; border-bottom: 1px solid var(--border); }
  .settings-mid { width: 100%; max-height: 200px; border-right: none; border-bottom: 1px solid var(--border); }
}
@media (max-width: 768px) {
  #sidebar { position: fixed; left: 0; top: 0; bottom: 0; z-index: 50; transform: translateX(-100%); transition: transform 0.2s; }
  #sidebar.open { transform: translateX(0); }
  .mobile-only { display: inline-flex; }
}
.cursor { display: inline-block; width: 2px; height: 1em; background: var(--accent); margin-left: 2px; vertical-align: text-bottom; animation: blink 0.9s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* Cards & form rows like Chatbox */
.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 14px;
  background: var(--bg);
}
.card-title { font-size: 13px; font-weight: 600; margin-bottom: 12px; color: var(--text); }
.card-title-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.card-actions { display: flex; gap: 8px; }
.form-row { display: flex; gap: 16px; padding: 10px 0; border-top: 1px solid var(--border-soft, var(--border)); }
.form-row:first-of-type { border-top: none; padding-top: 0; }
.form-row.between { align-items: center; justify-content: space-between; }
.form-label { width: 160px; flex-shrink: 0; font-size: 13px; color: var(--text); line-height: 1.4; }
.form-ctrl { flex: 1; min-width: 0; }
.form-ctrl input[type="text"],
.form-ctrl input[type="password"],
.form-ctrl input[type="number"],
.form-ctrl select,
.form-ctrl textarea {
  width: 100%; padding: 8px 11px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-size: 13.5px; font-family: inherit; outline: none;
}
.form-ctrl textarea { min-height: 64px; resize: vertical; }
.form-ctrl input:focus, .form-ctrl select:focus, .form-ctrl textarea:focus { border-color: var(--accent); }
.hint { font-size: 12px; color: var(--text-3); margin-top: 4px; line-height: 1.4; }
.row-inline { display: flex; align-items: center; gap: 8px; }
.row-inline input[type="text"], .row-inline input[type="password"] { flex: 1; }
.btn-sm { padding: 6px 10px; font-size: 12px; }
.btn-link { border: none; background: transparent; color: var(--accent); font-size: 13px; cursor: pointer; padding: 4px 6px; }
.btn-link:hover { text-decoration: underline; }
.pd-head { margin-bottom: 12px; }
.pd-head h2 { margin: 0; }

/* Switch */
.switch { position: relative; display: inline-block; width: 44px; height: 24px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch span {
  position: absolute; inset: 0; background: #d1d5db; border-radius: 999px; cursor: pointer; transition: 0.2s;
}
.switch span:before {
  content: ""; position: absolute; width: 18px; height: 18px; left: 3px; top: 3px;
  background: #fff; border-radius: 50%; transition: 0.2s;
}
.switch input:checked + span { background: var(--accent); }
.switch input:checked + span:before { transform: translateX(20px); }

/* Slider */
.slider { flex: 1; accent-color: var(--accent); }
.num-sm { width: 72px !important; flex-shrink: 0; }

/* Chips */
.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  border: 1px solid var(--border); background: var(--bg); border-radius: 8px;
  padding: 5px 12px; font-size: 12.5px; cursor: pointer; color: var(--text-2);
}
.chip.active, .chip:hover { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }

/* Model table in provider detail */
.model-table { display: flex; flex-direction: column; gap: 2px; }
.model-row {
  display: flex; align-items: center; gap: 10px; padding: 10px 8px;
  border-radius: 8px; border-bottom: 1px solid var(--border);
}
.model-row:last-child { border-bottom: none; }
.model-row .mname { flex: 1; font-size: 13.5px; }
.model-row .mact { display: flex; gap: 4px; }
.model-row .mact button {
  border: none; background: transparent; color: var(--text-3); cursor: pointer;
  padding: 4px 6px; border-radius: 4px; font-size: 14px;
}
.model-row .mact button:hover { background: var(--bg-hover); color: var(--text); }
.model-row .mact button.del:hover { color: var(--danger); }

.memory-list { font-size: 13px; color: var(--text-2); }
.border-soft { --x: 1; }

@media (max-width: 700px) {
  .form-row { flex-direction: column; gap: 6px; }
  .form-label { width: auto; }
}

.seg { display: flex; gap: 4px; background: var(--bg-sidebar); padding: 3px; border-radius: 8px; }
.seg-btn {
  border: none; background: transparent; padding: 5px 10px; border-radius: 6px;
  font-size: 12.5px; color: var(--text-2); cursor: pointer;
}
.seg-btn.active { background: var(--bg); color: var(--text); font-weight: 600; box-shadow: 0 1px 2px rgba(0,0,0,0.06); }
.kb-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 4px; border-bottom: 1px solid var(--border); font-size: 13.5px;
}
.kb-row:last-child { border-bottom: none; }
.kb { display: flex; gap: 4px; }
kbd {
  display: inline-block; padding: 2px 7px; border: 1px solid var(--border);
  border-radius: 5px; background: var(--bg-sidebar); font-size: 12px; color: var(--text-2);
  font-family: var(--font);
}
.avatar-preview {
  width: 28px; height: 28px; border-radius: 50%; background: var(--user-avatar);
  color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: 12px;
}
.avatar-preview.ai { background: var(--ai-avatar); border-radius: 8px; }
.table-card { padding: 8px 14px; }
.hidden { display: none !important; }