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

/* ── Dark theme (default) ──────────────────────────────────── */
:root {
  --bg0: #111114;
  --bg1: #1a1a1f;
  --bg2: #222228;
  --bg3: #2a2a32;
  --bg4: #32323c;
  --fg1: #e2e2e8;
  --fg2: #8888a0;
  --fg3: #55556a;
  --accent:  #7c3aed;
  --acc-h:   #6d28d9;
  --acc-d:   rgba(124,58,237,.15);
  --acc-dd:  rgba(124,58,237,.08);
  --border:  #2e2e38;
  --focus:   #7c3aed;
  --ok:      #22c55e;
  --err:     #ef4444;
  --warn:    #f59e0b;
  --scroll:  #3a3a48;
  --code-bg: #0d0d12;
  --ububble: #1d4ed8;
  --ububble-text: #fff;
  --abubble: #1e1e26;
  --abubble-border: #2e2e38;
  --think-bg: rgba(245,158,11,.07);
  --think-border: rgba(245,158,11,.25);
  --think-text: #c8a840;
  --meta-text: #66667a;
  --chip-bg: #2a2a38;
  --chip-text: #a0a0c0;
  --danger: #ef4444;
}

/* ── Light theme ───────────────────────────────────────────── */
[data-theme="light"] {
  --bg0: #f0f2f5;
  --bg1: #ffffff;
  --bg2: #f8f8fb;
  --bg3: #eeeff4;
  --bg4: #e4e5ec;
  --fg1: #1a1a2e;
  --fg2: #55556e;
  --fg3: #9999b0;
  --border:  #dddde8;
  --focus:   #7c3aed;
  --ok:      #16a34a;
  --err:     #dc2626;
  --warn:    #d97706;
  --scroll:  #ccccdc;
  --code-bg: #f4f4f8;
  --ububble: #2563eb;
  --ububble-text: #fff;
  --abubble: #ffffff;
  --abubble-border: #dddde8;
  --think-bg: rgba(217,119,6,.07);
  --think-border: rgba(217,119,6,.3);
  --think-text: #92660a;
  --meta-text: #9999b0;
  --chip-bg: #e8e8f2;
  --chip-text: #5555a0;
}

/* ── Base ──────────────────────────────────────────────────── */
html, body {
  width: 100%; height: 100%; overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 13px; line-height: 1.5;
  background: var(--bg0); color: var(--fg1);
  -webkit-font-smoothing: antialiased;
}

#app {
  display: flex; flex-direction: column;
  height: 100vh; width: 100%; overflow: hidden;
  background: var(--bg0); color: var(--fg1);
  transition: background .2s, color .2s;
}

/* ── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar       { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scroll); border-radius: 2px; }

/* ── Header ────────────────────────────────────────────────── */
header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 11px;
  background: var(--bg1); border-bottom: 1px solid var(--border);
  flex-shrink: 0; min-height: 40px; z-index: 2;
}
.h-left, .h-right { display: flex; align-items: center; gap: 5px; }
.app-title { font-weight: 700; font-size: 13px; letter-spacing: .02em; }

.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--warn); flex-shrink: 0;
  transition: background .3s;
}
.status-dot.connected { background: var(--ok); }
.status-dot.error     { background: var(--err); }

/* ── Buttons ───────────────────────────────────────────────── */
.icon-btn {
  background: none; border: none; cursor: pointer;
  color: var(--fg2); font-size: 16px;
  padding: 4px 5px; border-radius: 5px; line-height: 1;
  transition: background .12s, color .12s;
  display: inline-flex; align-items: center; justify-content: center;
}
.icon-btn:hover  { background: var(--bg3); color: var(--fg1); }
.icon-btn.active { color: var(--accent); }
.icon-btn.sm     { font-size: 13px; padding: 3px 4px; }
.icon-btn.danger:hover { color: var(--err); }

.primary-btn {
  width: 100%; padding: 8px 12px;
  background: var(--accent); color: #fff;
  border: none; border-radius: 6px; cursor: pointer;
  font-size: 13px; font-weight: 500; font-family: inherit;
  transition: background .12s;
}
.primary-btn:hover  { background: var(--acc-h); }
.primary-btn:active { transform: scale(.98); }
.primary-btn.sm { padding: 5px 10px; font-size: 12px; width: auto; }

.pill-btn {
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--fg2); padding: 3px 10px;
  border-radius: 20px; cursor: pointer; font-size: 11.5px; font-family: inherit;
  transition: background .12s, border-color .12s;
  white-space: nowrap;
}
.pill-btn:hover { background: var(--bg4); border-color: var(--accent); color: var(--fg1); }

/* ── Drop panels (settings + sessions) ────────────────────── */
.drop-panel {
  background: var(--bg1); border-bottom: 1px solid var(--border);
  padding: 11px; flex-shrink: 0;
  display: flex; flex-direction: column; gap: 9px;
  overflow-y: auto; max-height: 52vh;
}
.drop-panel.hidden { display: none; }

.field-group { display: flex; flex-direction: column; gap: 4px; }
.field-lbl {
  font-size: 10px; font-weight: 600; text-transform: uppercase;
  letter-spacing: .06em; color: var(--fg2);
  display: flex; align-items: center; gap: 4px;
}
.hint { text-transform: none; font-weight: 400; letter-spacing: 0; color: var(--fg3); }

.field-group input {
  width: 100%; background: var(--bg0);
  border: 1px solid var(--border); color: var(--fg1);
  padding: 6px 9px; border-radius: 6px;
  font-size: 13px; font-family: inherit; outline: none;
  transition: border-color .12s;
}
.field-group input:focus { border-color: var(--focus); }

.input-row-inline { display: flex; gap: 4px; align-items: center; }
.input-row-inline input { flex: 1; }

.status-line {
  font-size: 11.5px; text-align: center; min-height: 14px;
  color: var(--fg3); transition: color .2s;
}
.status-line.ok  { color: var(--ok); }
.status-line.err { color: var(--err); }

/* ── Sessions panel ────────────────────────────────────────── */
.panel-hdr {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 2px;
}
.panel-title { font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: .06em; color: var(--fg2); }

.sessions-list { display: flex; flex-direction: column; gap: 2px; }

.session-item {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 9px; border-radius: 7px; cursor: pointer;
  border: 1px solid transparent;
  transition: background .12s, border-color .12s;
  min-height: 36px;
}
.session-item:hover   { background: var(--bg3); }
.session-item.active  { background: var(--acc-d); border-color: var(--accent); }

.session-item-name {
  flex: 1; font-size: 12.5px; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis; min-width: 0;
}
.session-item-meta { font-size: 10.5px; color: var(--fg3); white-space: nowrap; }
.session-item-actions { display: flex; gap: 2px; opacity: 0; transition: opacity .15s; }
.session-item:hover .session-item-actions { opacity: 1; }

/* ── Session bar ───────────────────────────────────────────── */
.session-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 10px 5px 12px;
  background: var(--bg1); border-bottom: 1px solid var(--border);
  flex-shrink: 0; min-height: 34px;
}
.session-name {
  flex: 1; font-size: 12.5px; font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  cursor: text; color: var(--fg1);
}
.session-bar-actions { display: flex; gap: 2px; flex-shrink: 0; }

/* ── Chat area ─────────────────────────────────────────────── */
.chat-area {
  flex: 1; overflow-y: auto; padding: 12px;
  display: flex; flex-direction: column; scroll-behavior: smooth;
}

.messages { display: flex; flex-direction: column; gap: 14px; flex: 1; }

/* ── Empty state ───────────────────────────────────────────── */
.empty-state {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; flex: 1; gap: 10px;
  text-align: center; padding: 32px 16px; user-select: none;
}
.empty-state .ei { font-size: 34px; line-height: 1; }
.empty-state p { font-size: 13px; line-height: 1.7; max-width: 230px; color: var(--fg2); }

/* ── Messages ──────────────────────────────────────────────── */
.message {
  display: flex; flex-direction: column; max-width: 100%;
  animation: msgIn .15s ease-out;
}
@keyframes msgIn { from { opacity:0; transform:translateY(4px); } to { opacity:1; transform:translateY(0); } }

.message.user      { align-items: flex-end; }
.message.assistant { align-items: flex-start; }

.msg-role {
  font-size: 9.5px; color: var(--fg3); margin-bottom: 3px; padding: 0 4px;
  font-weight: 600; letter-spacing: .05em; text-transform: uppercase;
}

.msg-body { display: flex; flex-direction: column; max-width: 92%; gap: 3px; }

.msg-bubble {
  padding: 8px 13px; border-radius: 14px;
  word-break: break-word; overflow-wrap: break-word;
  font-size: 13px; line-height: 1.65; white-space: pre-wrap;
}

.message.user .msg-bubble {
  background: var(--ububble); color: var(--ububble-text);
  border-bottom-right-radius: 4px;
}
.message.assistant .msg-bubble {
  background: var(--abubble); color: var(--fg1);
  border: 1px solid var(--abubble-border);
  border-bottom-left-radius: 4px; white-space: normal;
}

/* Streaming cursor */
.msg-bubble.streaming::after {
  content: '\25AE'; display: inline-block; margin-left: 2px;
  color: var(--accent); animation: cblink .7s step-end infinite;
}
@keyframes cblink { 50% { opacity: 0; } }

/* Error bubble */
.message.error .msg-bubble {
  background: rgba(239,68,68,.1);
  border: 1px solid rgba(239,68,68,.3); color: #fca5a5;
}

/* Inline stream error note */
.stream-err-note {
  margin-top: 6px; padding: 5px 9px;
  background: rgba(239,68,68,.08); border: 1px solid rgba(239,68,68,.25);
  border-radius: 5px; color: #fca5a5; font-size: 11.5px;
}

/* ── Thinking block ────────────────────────────────────────── */
.think-block {
  border: 1px solid var(--think-border);
  background: var(--think-bg); border-radius: 8px;
  overflow: hidden; font-size: 12px; max-width: 100%;
}
.think-block summary {
  padding: 5px 10px; cursor: pointer; user-select: none;
  color: var(--think-text); font-weight: 500; font-size: 11.5px;
  list-style: none; display: flex; align-items: center; gap: 5px;
}
.think-block summary::-webkit-details-marker { display: none; }
.think-block summary::before { content: '▶'; font-size: 9px; transition: transform .2s; }
.think-block[open] summary::before { transform: rotate(90deg); }
.think-content {
  padding: 8px 10px 9px; color: var(--think-text);
  border-top: 1px solid var(--think-border);
  max-height: 200px; overflow-y: auto;
  white-space: pre-wrap; word-break: break-word;
  font-size: 12px; line-height: 1.55;
}

/* ── Message metadata ──────────────────────────────────────── */
.msg-meta { display: flex; flex-direction: column; gap: 3px; }

.source-chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: 4px;
  background: var(--acc-dd); color: var(--accent);
  font-size: 11px; border: 1px solid rgba(124,58,237,.2);
  max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.metrics-line {
  font-size: 10.5px; color: var(--meta-text);
  padding-left: 2px;
}

/* ── Bubble action buttons ─────────────────────────────────── */
.msg-actions {
  display: flex; gap: 3px; padding: 1px 2px;
  opacity: 0; transition: opacity .15s;
}
.message:hover .msg-actions { opacity: 1; }
.act-btn {
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--fg2); padding: 2px 7px;
  border-radius: 4px; cursor: pointer; font-size: 11.5px;
  font-family: inherit; transition: background .12s, color .12s, border-color .12s;
  display: inline-flex; align-items: center; gap: 3px;
}
.act-btn:hover { background: var(--bg4); border-color: var(--accent); color: var(--fg1); }

/* Edit mode */
.edit-textarea {
  width: 100%; background: var(--bg0); border: 1px solid var(--focus);
  color: var(--fg1); padding: 8px 10px; border-radius: 8px;
  font-size: 13px; font-family: inherit; resize: vertical;
  outline: none; min-height: 60px; max-height: 180px;
}
.edit-actions { display: flex; gap: 6px; margin-top: 5px; }
.secondary-btn {
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--fg2); padding: 5px 12px;
  border-radius: 6px; cursor: pointer; font-size: 12px; font-family: inherit;
  transition: background .12s;
}
.secondary-btn:hover { background: var(--bg4); color: var(--fg1); }

/* Code inside bubbles */
.msg-bubble pre {
  background: var(--code-bg); border: 1px solid var(--bg3);
  border-radius: 6px; padding: 9px 11px;
  overflow-x: auto; margin: 6px 0; white-space: pre;
}
.msg-bubble code {
  font-family: 'Fira Code','Cascadia Code','Menlo','Consolas', monospace; font-size: 12px;
}
.msg-bubble pre code { background: none; padding: 0; font-size: 11.5px; line-height: 1.5; }
.msg-bubble :not(pre) > code {
  background: rgba(0,0,0,.25); padding: 1px 5px; border-radius: 3px; font-size: 12px;
}
[data-theme="light"] .msg-bubble :not(pre) > code { background: rgba(0,0,0,.07); }
.msg-bubble strong { font-weight: 600; }
.msg-bubble em { font-style: italic; }

/* ── Input area ────────────────────────────────────────────── */
.input-area {
  flex-shrink: 0; background: var(--bg1);
  border-top: 1px solid var(--border);
  padding: 8px 11px 11px;
  display: flex; flex-direction: column; gap: 6px;
}

/* Collapsibles (system prompt, params) */
.collapsible {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 8px; overflow: hidden;
}
.collapsible.hidden { display: none; }
.coll-hdr {
  display: flex; align-items: center; justify-content: space-between;
  padding: 5px 10px; background: var(--bg3);
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: .05em; color: var(--fg2);
}

.collapsible textarea, #input-system-prompt {
  width: 100%; background: var(--bg2); border: none;
  color: var(--fg1); padding: 8px 10px;
  font-size: 13px; font-family: inherit; resize: none;
  outline: none; max-height: 100px; overflow-y: auto;
  border-top: 1px solid var(--border);
}

/* Params grid */
.params-grid {
  padding: 8px 10px; display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 5px 8px; align-items: center;
}
.param-lbl { font-size: 11.5px; color: var(--fg2); white-space: nowrap; }
.param-input {
  width: 100%; background: var(--bg0); border: 1px solid var(--border);
  color: var(--fg1); padding: 3px 6px; border-radius: 5px;
  font-size: 12px; font-family: inherit; outline: none;
}
.param-input:focus { border-color: var(--focus); }
.param-val { font-size: 11px; color: var(--fg3); text-align: right; min-width: 28px; }

/* File chips */
.file-chips-area { display: flex; flex-wrap: wrap; gap: 5px; }
.file-chips-area.hidden { display: none; }
.file-chip {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--chip-bg); color: var(--chip-text);
  border: 1px solid var(--border); border-radius: 5px;
  padding: 3px 8px; font-size: 11.5px; max-width: 160px;
}
.file-chip-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.file-chip-del {
  background: none; border: none; cursor: pointer;
  color: var(--fg3); font-size: 11px; padding: 0 1px;
  flex-shrink: 0;
}
.file-chip-del:hover { color: var(--err); }

/* Toolbar */
.toolbar { display: flex; align-items: center; gap: 5px; }
.tb-spacer { flex: 1; }
.toolbar-btn {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--fg2); padding: 4px 8px; border-radius: 5px;
  cursor: pointer; font-size: 11.5px; font-family: inherit;
  transition: border-color .12s, color .12s, background .12s;
  white-space: nowrap; max-width: 130px;
}
.toolbar-btn:hover { border-color: var(--accent); color: var(--fg1); }
.toolbar-btn.active { background: var(--acc-d); border-color: var(--accent); color: var(--accent); }
.tbi { font-size: 12px; flex-shrink: 0; line-height: 1; }

/* Page context label truncation */
#page-ctx-lbl { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 90px; }

/* Textarea */
#input-message {
  width: 100%; background: var(--bg0); border: 1px solid var(--border);
  color: var(--fg1); padding: 8px 10px; border-radius: 8px;
  font-size: 13px; font-family: inherit; line-height: 1.5;
  resize: none; outline: none;
  min-height: 54px; max-height: 160px;
  transition: border-color .12s; overflow-y: auto; display: block;
}
#input-message:focus       { border-color: var(--focus); }
#input-message::placeholder { color: var(--fg3); opacity: .7; }
#input-message:disabled    { opacity: .5; cursor: not-allowed; }

/* Template dropdown */
.tmpl-dropdown {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 8px; overflow: hidden; z-index: 10;
}
.tmpl-dropdown.hidden { display: none; }
.tmpl-dd-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 10px; background: var(--bg3);
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: .05em; color: var(--fg2);
}
.tmpl-dd-list { max-height: 160px; overflow-y: auto; }
.tmpl-dd-item {
  padding: 7px 11px; cursor: pointer;
  border-bottom: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 2px;
  transition: background .1s;
}
.tmpl-dd-item:last-child { border-bottom: none; }
.tmpl-dd-item:hover { background: var(--bg3); }
.tmpl-dd-name { font-size: 12.5px; color: var(--fg1); font-weight: 500; }
.tmpl-dd-preview { font-size: 11px; color: var(--fg3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Send row */
.send-row { display: flex; gap: 6px; align-items: center; }

#select-model {
  flex: 1; min-width: 0;
  background: var(--bg0); border: 1px solid var(--border);
  color: var(--fg1); padding: 6px 24px 6px 8px;
  border-radius: 7px; font-size: 12px; font-family: inherit;
  outline: none; cursor: pointer;
  -webkit-appearance: none; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23666'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 7px center;
  transition: border-color .12s;
}
#select-model:focus  { border-color: var(--focus); }
#select-model option { background: var(--bg2); color: var(--fg1); }

.send-btn {
  width: 34px; height: 34px; flex-shrink: 0;
  background: var(--accent); color: #fff; border: none;
  border-radius: 7px; cursor: pointer; font-size: 13px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .12s, transform .1s;
}
.send-btn:hover   { background: var(--acc-h); }
.send-btn:active  { transform: scale(.93); }
.send-btn:disabled { background: var(--bg4); color: var(--fg3); cursor: not-allowed; transform: none; }

.stop-btn {
  width: 34px; height: 34px; flex-shrink: 0;
  background: var(--err); color: #fff; border: none;
  border-radius: 7px; cursor: pointer; font-size: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .12s;
}
.stop-btn:hover  { background: #dc2626; }
.stop-btn.hidden { display: none; }
.send-btn.hidden { display: none; }

/* ── Template manager overlay ──────────────────────────────── */
.overlay {
  position: absolute; inset: 0; z-index: 20;
  background: rgba(0,0,0,.55);
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: 40px;
}
.overlay.hidden { display: none; }

.overlay-panel {
  background: var(--bg1); border: 1px solid var(--border);
  border-radius: 10px; width: calc(100% - 24px); max-width: 380px;
  display: flex; flex-direction: column; max-height: 80vh; overflow: hidden;
}
.overlay-hdr {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  font-weight: 600; font-size: 14px; flex-shrink: 0;
}

.tmpl-list {
  overflow-y: auto; flex: 1; display: flex; flex-direction: column; gap: 0;
}
.tmpl-item {
  display: flex; align-items: flex-start; gap: 8px;
  padding: 9px 13px; border-bottom: 1px solid var(--border);
  transition: background .1s;
}
.tmpl-item:hover { background: var(--bg2); }
.tmpl-item-body { flex: 1; min-width: 0; }
.tmpl-item-name  { font-size: 13px; font-weight: 500; color: var(--fg1); }
.tmpl-item-text  { font-size: 11.5px; color: var(--fg3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 2px; }
.tmpl-item-del {
  background: none; border: none; cursor: pointer;
  color: var(--fg3); font-size: 13px; padding: 2px 4px; flex-shrink: 0;
}
.tmpl-item-del:hover { color: var(--err); }

.tmpl-add-form {
  padding: 11px 13px; border-top: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 7px; flex-shrink: 0;
}
.tmpl-add-form input, .tmpl-add-form textarea {
  background: var(--bg0); border: 1px solid var(--border);
  color: var(--fg1); padding: 7px 9px; border-radius: 6px;
  font-size: 13px; font-family: inherit; outline: none;
}
.tmpl-add-form input:focus, .tmpl-add-form textarea:focus { border-color: var(--focus); }
.tmpl-add-form textarea { resize: vertical; min-height: 70px; }

/* ── Relative positioning for overlay ─────────────────────── */
#app { position: relative; }