/* ========== 主题变量 ========== */
:root {
  --bg: #f7f7f8;
  --bg-elev: #ffffff;
  --bg-soft: #f0f0f3;
  --border: #e5e5ea;
  --text: #1a1a1f;
  --text-soft: #6b6b75;
  --text-faint: #9a9aa3;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --user-bubble: #4f46e5;
  --user-text: #ffffff;
  --assistant-bubble: #ffffff;
  --code-bg: #f6f6f9;
  --terminal-bg: #1a1a1f;
  --shadow: 0 2px 12px rgba(0,0,0,.04), 0 1px 3px rgba(0,0,0,.06);
  --radius: 12px;
}

[data-theme="dark"] {
  --bg: #0e0e11;
  --bg-elev: #18181d;
  --bg-soft: #22222a;
  --border: #2a2a33;
  --text: #ececf0;
  --text-soft: #a0a0aa;
  --text-faint: #6b6b75;
  --accent: #818cf8;
  --accent-soft: #1e1e2e;
  --user-bubble: #4f46e5;
  --user-text: #ffffff;
  --assistant-bubble: #22222a;
  --code-bg: #16161c;
  --shadow: 0 2px 12px rgba(0,0,0,.4), 0 1px 3px rgba(0,0,0,.3);
}

/* ========== 基础 ========== */
* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
input, textarea { font: inherit; color: inherit; }

/* ========== 顶栏 ========== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 16px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.topbar-left { display: flex; align-items: center; gap: 24px; }
.topbar-right { display: flex; align-items: center; gap: 8px; }

.logo { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.logo-mark {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  display: grid; place-items: center;
  font-weight: 700;
}
.logo-text { font-size: 15px; }

.nav { display: flex; gap: 4px; }
.nav-btn {
  padding: 6px 12px;
  border-radius: 8px;
  color: var(--text-soft);
  transition: background .15s, color .15s;
}
.nav-btn:hover { background: var(--bg-soft); color: var(--text); }
.nav-btn.active { background: var(--accent-soft); color: var(--accent); }

.icon-btn {
  width: 36px; height: 36px;
  border-radius: 8px;
  display: grid; place-items: center;
  transition: background .15s;
}
.icon-btn:hover { background: var(--bg-soft); }

/* ========== 工作区 ========== */
.workspace {
  display: grid;
  height: calc(100vh - 56px);
  grid-template-columns: 1fr 6px 1fr;
}
.workspace[data-layout="chat"] { grid-template-columns: 1fr; }
.workspace[data-layout="chat"] .pane-terminal,
.workspace[data-layout="chat"] .splitter { display: none; }
.workspace[data-layout="terminal"] { grid-template-columns: 1fr; }
.workspace[data-layout="terminal"] .pane-chat,
.workspace[data-layout="terminal"] .splitter { display: none; }

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.splitter {
  background: var(--border);
  cursor: col-resize;
  position: relative;
}
.splitter:hover, .splitter.dragging { background: var(--accent); }

/* ========== Chat 面板 ========== */
.pane-chat { background: var(--bg); }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.msg {
  display: flex;
  gap: 12px;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}
.msg-user { flex-direction: row-reverse; }

.msg-avatar {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--bg-soft);
  display: grid; place-items: center;
  font-size: 16px;
  flex-shrink: 0;
}
.msg-user .msg-avatar { background: var(--accent); color: white; }

.msg-body { min-width: 0; flex: 1; }
.msg-user .msg-body { display: flex; flex-direction: column; align-items: flex-end; }

.msg-name {
  font-size: 12px;
  color: var(--text-faint);
  margin-bottom: 4px;
  padding: 0 4px;
}

.msg-content {
  background: var(--assistant-bubble);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  word-wrap: break-word;
  overflow-wrap: break-word;
  box-shadow: var(--shadow);
}
.msg-user .msg-content {
  background: var(--user-bubble);
  color: var(--user-text);
  border-color: transparent;
}
.msg-content > *:first-child { margin-top: 0; }
.msg-content > *:last-child { margin-bottom: 0; }
.msg-content p { margin: 6px 0; }
.msg-content pre {
  background: var(--code-bg);
  border-radius: 8px;
  padding: 10px 12px;
  margin: 8px 0;
  overflow-x: auto;
  font-size: 13px;
}
.msg-content code {
  background: var(--code-bg);
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 13px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}
.msg-content pre code { background: none; padding: 0; }
.msg-content ul, .msg-content ol { padding-left: 22px; margin: 6px 0; }

.msg-content a { color: var(--accent); text-decoration: underline; }
.msg-user .msg-content a { color: #c7d2fe; }

/* 流式打字光标 */
.cursor-blink::after {
  content: "▍";
  animation: blink 1s steps(1) infinite;
  color: var(--accent);
}
@keyframes blink { 50% { opacity: 0; } }

/* ========== 输入区 ========== */
.composer {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 12px 16px 20px;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}

#chat-input {
  flex: 1;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  resize: none;
  max-height: 180px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
#chat-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.btn-primary, .btn-danger, .btn-ghost {
  padding: 10px 16px;
  border-radius: 10px;
  font-weight: 500;
  transition: opacity .15s, transform .05s;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { opacity: .9; }
.btn-primary:active { transform: scale(.98); }
.btn-danger { background: #dc2626; color: white; }
.btn-ghost { color: var(--text-soft); }
.btn-ghost:hover { background: var(--bg-soft); }
.hidden { display: none !important; }

/* ========== Terminal 面板 ========== */
.pane-terminal {
  background: var(--terminal-bg);
  border-left: 1px solid var(--border);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: #2a2a33;
  color: #d0d0d6;
  font-size: 12px;
  font-family: "SF Mono", Menlo, monospace;
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-r { background: #ff5f57; }
.dot-y { background: #febc2e; }
.dot-g { background: #28c840; }
.terminal-title { margin-left: 8px; flex: 1; }
.terminal-status {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  background: #444;
  color: #aaa;
}
.terminal-status.connected { background: #28c840; color: #04260a; }
.terminal-status.error { background: #ff5f57; color: #2a0606; }

.terminal-host {
  flex: 1;
  padding: 8px;
  min-height: 0;
}
.terminal-host .xterm,
.terminal-host .xterm-viewport,
.terminal-host .xterm-screen { height: 100% !important; }

/* ========== Modal ========== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  display: grid;
  place-items: center;
  z-index: 100;
  backdrop-filter: blur(4px);
}
.modal.hidden { display: none; }

.modal-card {
  width: min(560px, 90vw);
  max-height: 86vh;
  background: var(--bg-elev);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,.3);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-head h3 { font-size: 16px; }
.modal-body {
  padding: 16px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.modal-body fieldset {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.modal-body legend {
  padding: 0 6px;
  font-size: 12px;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.modal-body label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--text-soft);
}
.modal-body input,
.modal-body textarea {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  outline: none;
}
.modal-body input:focus,
.modal-body textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.modal-body small { color: var(--text-faint); font-size: 11px; }

/* 预设按钮 */
.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.preset-label {
  font-size: 12px;
  color: var(--text-soft);
  margin-right: 4px;
}
.preset-btn {
  padding: 5px 12px;
  font-size: 12px;
  border-radius: 6px;
  background: var(--bg-soft);
  color: var(--text);
  transition: background .15s, color .15s;
  border: 1px solid transparent;
}
.preset-btn:hover {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}
.preset-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.modal-foot {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 20px;
  border-top: 1px solid var(--border);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .nav { display: none; }
  .workspace { grid-template-columns: 1fr; }
  .workspace .pane-terminal,
  .workspace .splitter { display: none; }
  .workspace[data-layout="terminal"] .pane-terminal { display: flex; }
}

/* ========== 滚动条 ========== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }
::-webkit-scrollbar-track { background: transparent; }

/* ========== Dev 面板 ========== */
.workspace[data-layout="dev"] { grid-template-columns: 1fr; }
.workspace[data-layout="dev"] .pane-chat,
.workspace[data-layout="dev"] .pane-terminal,
.workspace[data-layout="dev"] #splitter,
.workspace[data-layout="dev"] #splitter2 { display: none; }
.workspace[data-layout="split"] {
  grid-template-columns: 1fr 6px 1fr 6px 1fr;
}
.workspace[data-layout="split"] .pane-chat { display: flex; }
.workspace[data-layout="split"] .pane-terminal { display: flex; }
.workspace[data-layout="split"] .pane-dev { display: flex; }
.workspace[data-layout="split"] #splitter,
.workspace[data-layout="split"] #splitter2 { display: block; }

.pane-dev {
  background: var(--bg);
  border-left: 1px solid var(--border);
  min-width: 0;
}
.dev-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: #2a2a33;
  color: #d0d0d6;
  font-size: 12px;
  font-family: "SF Mono", Menlo, monospace;
}
.dev-status {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  background: #444;
  color: #aaa;
  margin-left: auto;
}
.dev-status.saving { background: #febc2e; color: #2a1c00; }
.dev-status.saved { background: #28c840; color: #04260a; }
.dev-status.error { background: #ff5f57; color: #2a0606; }

.dev-body {
  flex: 1;
  display: flex;
  min-height: 0;
}

.file-tree {
  width: 200px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: var(--bg-soft);
  display: flex;
  flex-direction: column;
}
.file-tree-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  font-size: 11px;
  color: var(--text-soft);
  letter-spacing: .06em;
  border-bottom: 1px solid var(--border);
}
.icon-btn-sm {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  display: grid;
  place-items: center;
  font-size: 12px;
  color: var(--text-soft);
}
.icon-btn-sm:hover { background: var(--bg); color: var(--text); }

#tree-list, #tree-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
  overflow-y: auto;
}
#tree-list { flex: 1; padding: 4px 0; }
#tree-list ul { padding-left: 12px; }
.tree-item {
  display: block;
  padding: 4px 10px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-radius: 0;
}
.tree-item:hover { background: var(--bg); }
.tree-item.file { cursor: pointer; }

.editor-host {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-elev);
}
.editor-tabs {
  display: flex;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  min-height: 32px;
  overflow-x: auto;
}
.editor-tabs .tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  font-size: 12px;
  background: var(--bg-soft);
  border-right: 1px solid var(--border);
  cursor: pointer;
  white-space: nowrap;
}
.editor-tabs .tab.active {
  background: var(--bg-elev);
  color: var(--text);
  border-bottom: 2px solid var(--accent);
}
.editor-tabs .tab.dirty { font-style: italic; color: var(--accent); }
.editor-tabs .tab-close {
  font-size: 14px;
  color: var(--text-soft);
  padding: 0 4px;
  border-radius: 3px;
}
.editor-tabs .tab-close:hover { background: var(--border); color: var(--text); }

.editor-wrap {
  flex: 1;
  min-height: 0;
  overflow: auto;
  position: relative;
}
.editor-wrap .CodeMirror {
  height: 100% !important;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
}
.editor-empty {
  height: 100%;
  display: grid;
  place-items: center;
  color: var(--text-faint);
  font-size: 14px;
}

.editor-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 12px;
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-soft);
  font-family: "SF Mono", Menlo, monospace;
}
.editor-hint { color: var(--text-faint); }