/* ═══════════════════════════════════════════════
   SATURN RING — Chat UI
   claude.ai 风格 · 暖色护眼 · 双主题 · 双端响应
   （赛博朋克旧版备份在 style.css.bak.cyber-0725）
   ═══════════════════════════════════════════════ */

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

/* ─── 主题变量：默认暖黑（夜间护眼） ─── */
:root {
  --bg: #262624;
  --bg-deep: #1f1e1d;
  --bg-panel: #2b2a28;
  --bg-raised: #30302e;
  --bg-hover: rgba(255, 255, 255, 0.055);
  --bg-active: rgba(255, 255, 255, 0.09);

  --text: #eceae2;
  --text-secondary: #b8b5a9;
  --text-dim: #8f8d84;
  --text-faint: #6b695f;

  --accent: #d97757;
  --accent-hover: #e08662;
  --accent-soft: rgba(217, 119, 87, 0.12);
  --accent-border: rgba(217, 119, 87, 0.32);

  --user-bubble: #393937;
  --user-bubble-border: rgba(255, 255, 255, 0.06);
  --ai-bubble: transparent;

  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  --code-bg: #1f1e1d;
  --code-border: rgba(255, 255, 255, 0.07);

  --danger: #e0605e;
  --danger-soft: rgba(224, 96, 94, 0.12);
  --ok: #7ca87c;
  --warn: #d9a557;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.22);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.42);

  --radius-lg: 18px;
  --radius: 14px;
  --radius-sm: 9px;
  --bubble-max: 74%;
  --chat-max-width: 780px;

  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Georgia", "Noto Serif SC", "Songti SC", serif;
  --font-mono: ui-monospace, "SF Mono", "Consolas", "Menlo", monospace;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.4, 0.64, 1);
}

/* ─── 日间：奶油纸感 ─── */
:root[data-theme="light"] {
  --bg: #faf9f5;
  --bg-deep: #f2f0e9;
  --bg-panel: #f6f5f0;
  --bg-raised: #ffffff;
  --bg-hover: rgba(61, 57, 41, 0.05);
  --bg-active: rgba(61, 57, 41, 0.09);

  --text: #3d3929;
  --text-secondary: #6e6a5e;
  --text-dim: #9c988a;
  --text-faint: #b5b1a3;

  --accent: #c96442;
  --accent-hover: #b85835;
  --accent-soft: rgba(201, 100, 66, 0.1);
  --accent-border: rgba(201, 100, 66, 0.3);

  --user-bubble: #eeebe2;
  --user-bubble-border: rgba(61, 57, 41, 0.07);

  --border: rgba(61, 57, 41, 0.1);
  --border-strong: rgba(61, 57, 41, 0.18);

  --code-bg: #f2f0e9;
  --code-border: rgba(61, 57, 41, 0.09);

  --danger: #c04a48;
  --danger-soft: rgba(192, 74, 72, 0.1);
  --ok: #5e8a5e;
  --warn: #b8842f;

  --shadow-sm: 0 1px 3px rgba(61, 57, 41, 0.08);
  --shadow-md: 0 4px 16px rgba(61, 57, 41, 0.1);
  --shadow-lg: 0 12px 40px rgba(61, 57, 41, 0.16);
}

/* ═══ 主题切换整体过渡 ═══ */
body, .header, .input-wrapper, .bubble, textarea, .msg-actions,
.tool-card, .toolbar-popup, .mcp-panel, .ctx-panel, .tool-modal {
  transition: background-color 0.35s ease, border-color 0.35s ease, color 0.35s ease;
}

/* ═══ BODY ═══ */
body {
  font-family: var(--font-ui);
  background: var(--bg);
  height: 100vh; height: 100dvh;
  display: flex; flex-direction: column;
  color: var(--text);
  overflow: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
  -webkit-font-smoothing: antialiased;
}
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }
::selection { background: var(--accent-soft); }

/* 旧版扫描线彻底退休 */
.scan-overlay { display: none; }

/* ═══════════════════════════════════════
   HEADER
   ═══════════════════════════════════════ */
.header {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  display: flex;
  align-items: center;
  flex-shrink: 0;
  position: relative;
  z-index: 10;
}

.header-back {
  color: var(--text-secondary);
  text-decoration: none;
  flex-shrink: 0;
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  transition: background 0.15s ease, color 0.15s ease, transform 0.1s ease;
}
.header-back:hover { color: var(--text); background: var(--bg-hover); }
.header-back:active { transform: scale(0.92); }

.header-center {
  flex: 1;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 0;
}
.header-title {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 2.5px;
}
.header-sub {
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 2px;
  text-transform: lowercase;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  justify-content: flex-end;
}
.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ok);
  animation: breathe 4s ease-in-out infinite;
}
@keyframes breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
.status-text {
  font-size: 9px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

/* 主题切换按钮 */
.theme-btn {
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, transform 0.35s var(--ease-spring);
  -webkit-tap-highlight-color: transparent;
}
.theme-btn:hover { background: var(--bg-hover); color: var(--text); }
.theme-btn:active { transform: rotate(40deg) scale(0.9); }
.theme-btn svg { width: 16px; height: 16px; }

.clear-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-ui);
  font-size: 10px;
  letter-spacing: 1px;
  padding: 5px 10px;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.15s ease;
}
.clear-btn:hover { color: var(--danger); border-color: var(--danger); background: var(--danger-soft); }

/* ═══════════════════════════════════════
   CHAT AREA
   ═══════════════════════════════════════ */
.chat-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 28px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: var(--chat-max-width);
  width: 100%;
  margin: 0 auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

/* ═══════════════════════════════════════
   消息 — claude.ai式：用户浅气泡 AI近乎平铺
   ═══════════════════════════════════════ */
@keyframes msg-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.msg-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  animation: msg-in 0.35s var(--ease-out) both;
}
.msg-group.user { align-items: flex-end; }
.msg-group.assistant { align-items: flex-start; }
.msg-group .message,
.msg-group .thinking-block,
.msg-group .muttering-block { max-width: var(--bubble-max); }

.message { max-width: var(--bubble-max); animation: msg-in 0.35s var(--ease-out) both; }
.message.user { align-self: flex-end; }
.message.assistant { align-self: flex-start; }

.message .bubble {
  padding: 11px 16px;
  font-size: 15px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ── 用户：柔和实心气泡 ── */
.message.user .bubble {
  background: var(--user-bubble);
  border: 1px solid var(--user-bubble-border);
  border-radius: var(--radius-lg) var(--radius-lg) 6px var(--radius-lg);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

/* ── AI：衬线 + 平铺 ── */
.message.assistant .bubble {
  background: var(--ai-bubble);
  border: none;
  border-radius: 6px var(--radius-lg) var(--radius-lg) var(--radius-lg);
  padding: 4px 2px;
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 15.5px;
  line-height: 1.8;
}

.message .time {
  font-size: 10px;
  color: var(--text-faint);
  margin-top: 5px;
  letter-spacing: 0.5px;
  padding: 0 2px;
}
.message.user .time { text-align: right; }
.edited-mark {
  margin-left: 6px;
  font-size: 9px;
  color: var(--text-faint);
  letter-spacing: 0.5px;
}

/* ═══════════════════════════════════════
   代码块
   ═══════════════════════════════════════ */
.message .bubble pre,
.message .bubble code { font-family: var(--font-mono); }

.message .bubble pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin: 10px 0;
  font-size: 12.5px;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--text-secondary);
  position: relative;
}
.message .bubble code {
  background: var(--bg-hover);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 0.85em;
  color: var(--text);
}
.message .bubble pre code {
  background: none; border: none; padding: 0; border-radius: 0; color: inherit;
}

.code-block-wrapper { position: relative; margin: 10px 0; }
.code-block-wrapper pre { margin: 0; }
.code-copy-btn {
  position: absolute;
  top: 8px; right: 8px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text-dim);
  font-size: 11px;
  padding: 4px 9px;
  cursor: pointer;
  display: flex; align-items: center; gap: 5px;
  transition: all 0.15s ease;
  font-family: var(--font-ui);
  z-index: 1;
  opacity: 0;
}
.code-block-wrapper:hover .code-copy-btn { opacity: 1; }
@media (hover: none) { .code-copy-btn { opacity: 1; } }
.code-copy-btn:hover { color: var(--text); border-color: var(--border-strong); }
.code-copy-btn.copied { color: var(--ok); border-color: var(--ok); }
.code-copy-btn svg { width: 12px; height: 12px; }

/* 纯代码块消息 */
.message.code-block-msg { max-width: min(92%, 660px); }
.message.code-block-msg .bubble { padding: 0; background: transparent; border: none; }
.message.code-block-msg .bubble pre { margin: 0; }
.message.code-block-msg .bubble pre::before {
  content: attr(data-lang);
  position: absolute;
  top: 8px; right: 76px;
  font-size: 9px;
  letter-spacing: 1.5px;
  color: var(--text-faint);
  pointer-events: none;
}

/* ═══════════════════════════════════════
   THINKING / MUTTERING 折叠块
   ═══════════════════════════════════════ */
.thinking-block, .muttering-block {
  animation: msg-in 0.35s var(--ease-out) both;
}
.thinking-block summary, .muttering-block summary {
  cursor: pointer;
  font-size: 12px;
  padding: 7px 14px;
  border-radius: var(--radius);
  user-select: none;
  -webkit-user-select: none;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: background 0.15s ease, border-color 0.15s ease;
  font-family: var(--font-ui);
  -webkit-tap-highlight-color: transparent;
}
.thinking-block summary::-webkit-details-marker,
.muttering-block summary::-webkit-details-marker { display: none; }

/* 小箭头 — 展开时旋转 */
.thinking-block summary::before,
.muttering-block summary::before {
  content: '';
  width: 5px; height: 5px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 0.25s var(--ease-out);
  flex-shrink: 0;
  opacity: 0.6;
}
.thinking-block[open] summary::before,
.muttering-block[open] summary::before { transform: rotate(45deg); }

.thinking-block summary {
  color: var(--text-dim);
  background: var(--bg-hover);
  border: 1px solid var(--border);
}
.thinking-block summary:hover { background: var(--bg-active); color: var(--text-secondary); }

.muttering-block summary {
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  opacity: 0.85;
}
.muttering-block summary:hover { opacity: 1; }

.thinking-block .fold-content, .muttering-block .fold-content {
  padding: 12px 16px;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  border-radius: var(--radius);
  animation: msg-in 0.25s var(--ease-out) both;
}
.thinking-block .fold-content {
  color: var(--text-dim);
  background: var(--bg-hover);
  border: 1px solid var(--border);
}
.muttering-block .fold-content {
  color: var(--text-secondary);
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  font-family: var(--font-serif);
  font-style: italic;
}

/* ── Thinking流式：claude.ai式文字微光 ── */
.thinking-block.streaming summary {
  background-color: var(--bg-hover);
  border: 1px solid var(--border);
}
.thinking-block.streaming summary {
  background-image: linear-gradient(100deg,
    var(--text-dim) 40%, var(--text) 50%, var(--text-dim) 60%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: text-shimmer 2s linear infinite;
}
@keyframes text-shimmer {
  0% { background-position: 120% 0; }
  100% { background-position: -80% 0; }
}
.thinking-block.streaming summary::before { border-color: var(--text-dim); }
.thinking-dots { display: inline-flex; gap: 3px; margin-left: 2px; }
.thinking-dots i {
  width: 3px; height: 3px;
  border-radius: 50%;
  background: var(--text-dim);
  animation: dot-bounce 1.2s ease-in-out infinite;
}
.thinking-dots i:nth-child(2) { animation-delay: 0.15s; }
.thinking-dots i:nth-child(3) { animation-delay: 0.3s; }
@keyframes dot-bounce {
  0%, 100% { opacity: 0.25; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-2px); }
}

.stream-bubble { min-height: 20px; }
/* 流式光标 */
.stream-bubble:not(:empty)::after {
  content: '';
  display: inline-block;
  width: 7px; height: 15px;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: var(--accent);
  border-radius: 2px;
  animation: caret-blink 1s steps(2) infinite;
}
@keyframes caret-blink { 50% { opacity: 0; } }

/* ═══════════════════════════════════════
   输入区 — claude.ai式大圆角输入盒
   ═══════════════════════════════════════ */
.input-wrapper {
  border-top: none;
  background: linear-gradient(to top, var(--bg) 75%, transparent);
  flex-shrink: 0;
  padding: 4px 16px 14px;
}
.input-toolbar, .input-row {
  max-width: var(--chat-max-width);
  margin: 0 auto;
}

.input-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 8px 8px 8px 16px;
  box-shadow: var(--shadow-md);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.input-row:focus-within {
  border-color: var(--accent-border);
  box-shadow: var(--shadow-md), 0 0 0 3px var(--accent-soft);
}
.input-row textarea {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 15px;
  padding: 8px 0;
  resize: none;
  outline: none;
  min-height: 38px;
  max-height: 160px;
  line-height: 1.55;
  caret-color: var(--accent);
}
.input-row textarea::placeholder { color: var(--text-faint); }

.input-toolbar {
  display: flex;
  gap: 2px;
  padding: 0 6px 6px;
}
.toolbar-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}
.toolbar-btn:hover { color: var(--text); background: var(--bg-hover); }
.toolbar-btn:active { transform: scale(0.9); }
.toolbar-btn.active { color: var(--accent); background: var(--accent-soft); }

/* ── 发送按钮：陶土色圆钮 ── */
#send-btn {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent);
  border: none;
  border-radius: 12px;
  color: #fff;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s var(--ease-spring), opacity 0.2s;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}
#send-btn:hover { background: var(--accent-hover); transform: scale(1.05); }
#send-btn:active { transform: scale(0.92); }
#send-btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }
#send-btn.streaming { background: var(--bg-active); color: var(--text-secondary); }
#send-btn.streaming:hover { background: var(--danger-soft); color: var(--danger); }
#send-btn .icon-send { display: block; }
#send-btn .icon-stop { display: none; }
#send-btn.streaming .icon-send { display: none; }
#send-btn.streaming .icon-stop { display: block; animation: breathe 2s ease-in-out infinite; }

/* ═══════════════════════════════════════
   消息操作栏
   ═══════════════════════════════════════ */
.msg-actions {
  display: flex;
  gap: 2px;
  padding: 3px;
  border-radius: 10px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-2px) scale(0.96);
  transition: opacity 0.18s var(--ease-out), transform 0.18s var(--ease-out);
  margin-top: -4px;
}
.msg-group:hover .msg-actions,
.msg-group.show-actions .msg-actions {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}
@media (hover: none) {
  .msg-group:hover .msg-actions { opacity: 0; pointer-events: none; }
  .msg-group.show-actions .msg-actions { opacity: 1; pointer-events: auto; transform: translateY(0) scale(1); }
}
.msg-action-btn {
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  background: transparent;
  border: none;
  border-radius: 7px;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.13s ease;
  -webkit-tap-highlight-color: transparent;
}
.msg-action-btn svg { width: 14px; height: 14px; }
.msg-action-btn:hover { color: var(--text); background: var(--bg-hover); }
.msg-action-btn:active { transform: scale(0.88); }
.msg-action-btn.danger:hover { color: var(--danger); background: var(--danger-soft); }
.msg-actions.copied-flash { border-color: var(--ok); }
@media (pointer: coarse) {
  .msg-action-btn { width: 38px; height: 38px; }
  .msg-action-btn svg { width: 16px; height: 16px; }
}

/* ═══ 编辑态 ═══ */
.msg-group.editing { width: 100%; }
.msg-editor {
  width: 100%;
  max-width: min(94%, 640px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: msg-in 0.25s var(--ease-out) both;
}
.msg-group.user .msg-editor { align-self: flex-end; }
.msg-editor textarea {
  width: 100%;
  background: var(--bg-raised);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 14.5px;
  line-height: 1.6;
  padding: 12px 15px;
  resize: none;
  outline: none;
  min-height: 60px;
  box-shadow: 0 0 0 3px var(--accent-soft);
  caret-color: var(--accent);
}
.msg-editor-btns { display: flex; gap: 6px; justify-content: flex-end; }
.msg-editor-btn {
  padding: 7px 15px;
  border-radius: 9px;
  font-family: var(--font-ui);
  font-size: 12.5px;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  -webkit-tap-highlight-color: transparent;
}
.msg-editor-btn:hover { background: var(--bg-hover); color: var(--text); }
.msg-editor-btn:active { transform: scale(0.96); }
.msg-editor-btn.save {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--bg-raised);
}
.msg-editor-btn.resend {
  color: #fff;
  border-color: transparent;
  background: var(--accent);
}
.msg-editor-btn.resend:hover { background: var(--accent-hover); color: #fff; }
@media (pointer: coarse) { .msg-editor-btn { padding: 10px 18px; } }

/* ═══════════════════════════════════════
   COMPACT分割线 & 日期chip
   ═══════════════════════════════════════ */
.compact-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 8px 0;
  animation: msg-in 0.35s var(--ease-out) both;
}
.compact-divider .cd-line {
  flex: 1; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-border), transparent);
}
.compact-divider .cd-label {
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--accent);
  white-space: nowrap;
  padding: 4px 13px;
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  background: var(--accent-soft);
  opacity: 0.9;
}

.date-chip {
  align-self: center;
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--text-dim);
  padding: 4px 14px;
  border-radius: 999px;
  background: var(--bg-hover);
  margin: 10px 0 0;
}

/* ═══════════════════════════════════════
   CTX METER — 上下文用量
   ═══════════════════════════════════════ */
.ctx-meter {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 3px;
  cursor: help;
}
.ctx-meter-track {
  width: 90px; height: 3px;
  border-radius: 2px;
  background: var(--bg-active);
  overflow: hidden;
}
.ctx-meter-fill {
  height: 100%; width: 0;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0.7;
  transition: width 0.6s var(--ease-out), background 0.3s;
}
.ctx-meter-fill.warn { background: var(--warn); opacity: 0.9; }
.ctx-meter-fill.hot { background: var(--danger); opacity: 1; }
.ctx-meter-text {
  font-size: 9px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  min-width: 24px;
}

/* ═══════════════════════════════════════
   工具卡片 & 弹框
   ═══════════════════════════════════════ */
.tool-card {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  margin: 2px 0;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: background 0.15s ease, border-color 0.15s ease;
  max-width: 320px;
  animation: msg-in 0.3s var(--ease-out) both;
}
.tool-card:hover { background: var(--bg-raised); border-color: var(--border-strong); }
.tool-card .tool-icon { font-size: 13px; }
.tool-card .tool-name { flex: 1; }
.tool-card .tool-arrow { opacity: 0.4; font-size: 12px; }
.tool-card.done { border-color: var(--border); }
.tool-card.running { border-color: var(--accent-border); }
.tool-card.running .tool-icon { animation: breathe 1.5s ease-in-out infinite; }

.tool-modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fade-in 0.15s ease-out;
}
@keyframes fade-in { from { opacity: 0; } }
.tool-modal {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  max-width: 560px; width: 90%;
  max-height: 70vh;
  overflow-y: auto;
  color: var(--text-secondary);
  box-shadow: var(--shadow-lg);
  animation: pop-in 0.25s var(--ease-spring) both;
}
@keyframes pop-in {
  from { opacity: 0; transform: scale(0.95) translateY(8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.tool-modal-header {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 14px; font-size: 15px; color: var(--text);
}
.tool-modal-header .close-btn {
  margin-left: auto; cursor: pointer;
  color: var(--text-dim); font-size: 17px;
  background: none; border: none; padding: 4px 8px;
  border-radius: 7px;
  transition: all 0.15s;
}
.tool-modal-header .close-btn:hover { color: var(--text); background: var(--bg-hover); }
.tool-modal label {
  display: block; font-size: 11px; color: var(--text-dim);
  margin: 12px 0 6px; text-transform: uppercase; letter-spacing: 1px;
}
.tool-modal pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-sm);
  padding: 12px; font-size: 12px; color: var(--text-secondary);
  overflow-x: auto; white-space: pre-wrap; word-break: break-all;
  max-height: 300px; overflow-y: auto; margin: 0;
  font-family: var(--font-mono);
}

/* ═══════════════════════════════════════
   TOOLBAR POPUP
   ═══════════════════════════════════════ */
.toolbar-popup {
  position: fixed;
  z-index: 100;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px;
  min-width: 180px;
  box-shadow: var(--shadow-lg);
  animation: popup-in 0.22s var(--ease-spring) both;
  transform-origin: bottom left;
}
@keyframes popup-in {
  from { opacity: 0; transform: translateY(6px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.popup-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 9px 12px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 13.5px;
  text-align: left;
  cursor: pointer;
  border-radius: 9px;
  transition: background 0.12s ease, color 0.12s ease;
  -webkit-tap-highlight-color: transparent;
}
.popup-item:hover { background: var(--bg-hover); color: var(--text); }
.popup-item.active { color: var(--accent); position: relative; }
.popup-item.active::after {
  content: '✓';
  position: absolute; right: 12px; top: 50%;
  transform: translateY(-50%);
  font-size: 12px; color: var(--accent);
}
.popup-label { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.popup-sub {
  font-size: 10px; color: var(--text-faint);
  white-space: nowrap; max-width: 140px;
  overflow: hidden; text-overflow: ellipsis;
}
.popup-item.active .popup-sub { color: var(--accent); opacity: 0.6; }

/* ═══════════════════════════════════════
   MCP PANEL
   ═══════════════════════════════════════ */
.mcp-panel-overlay {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 900;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  animation: fade-in 0.15s ease-out;
}
@keyframes sheet-up {
  from { transform: translateY(24px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}
.mcp-panel {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 20px 20px 0 0;
  width: 100%;
  max-width: 420px;
  max-height: 75vh;
  overflow-y: auto;
  padding: 0 0 calc(20px + env(safe-area-inset-bottom)) 0;
  animation: sheet-up 0.3s var(--ease-out);
  scrollbar-width: thin;
  box-shadow: var(--shadow-lg);
}
@media (min-width: 769px) {
  .mcp-panel-overlay { align-items: center; }
  .mcp-panel {
    border-radius: 20px;
    border-bottom: 1px solid var(--border);
    max-height: 70vh;
    animation: pop-in 0.25s var(--ease-spring) both;
  }
}
.mcp-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0;
  background: var(--bg-raised);
  z-index: 1;
}
.mcp-panel-title {
  font-family: var(--font-ui);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--text);
  font-weight: 600;
}
.mcp-panel-close {
  background: none; border: none;
  color: var(--text-dim); font-size: 16px;
  cursor: pointer; padding: 4px 8px;
  border-radius: 7px;
  transition: all 0.15s;
}
.mcp-panel-close:hover { color: var(--text); background: var(--bg-hover); }

.mcp-global-toggle {
  padding: 11px 20px;
  cursor: pointer;
  transition: background 0.15s;
  border-bottom: 1px solid var(--border);
}
.mcp-global-toggle:hover { background: var(--bg-hover); }
.mcp-global-label { font-size: 12.5px; color: var(--text-secondary); }

.mcp-group-header {
  padding: 14px 20px 6px;
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 1px;
  text-transform: uppercase;
}
.mcp-tool-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px 8px 28px;
  transition: background 0.15s;
}
.mcp-tool-row:hover { background: var(--bg-hover); }
.mcp-tool-name {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-secondary);
}

.mcp-toggle { cursor: pointer; padding: 4px; -webkit-tap-highlight-color: transparent; }
.mcp-toggle-track {
  width: 38px; height: 22px;
  border-radius: 11px;
  background: var(--bg-active);
  border: 1px solid var(--border);
  position: relative;
  transition: all 0.25s var(--ease-out);
}
.mcp-toggle.on .mcp-toggle-track {
  background: var(--accent);
  border-color: var(--accent);
}
.mcp-toggle-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--text-dim);
  position: absolute;
  top: 2px; left: 2px;
  transition: all 0.25s var(--ease-spring);
}
.mcp-toggle.on .mcp-toggle-thumb {
  left: 18px;
  background: #fff;
}

/* ═══════════════════════════════════════
   上下文管理面板
   ═══════════════════════════════════════ */
.ctx-overlay {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fade-in 0.15s ease-out;
}
.ctx-panel {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 90%; max-width: 480px;
  max-height: 80vh;
  display: flex; flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: pop-in 0.25s var(--ease-spring) both;
}
.ctx-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--border);
}
.ctx-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; color: var(--text);
}
.ctx-icon { color: var(--accent); font-size: 15px; }
.ctx-count {
  font-size: 11.5px; color: var(--text-dim);
  background: var(--bg-hover);
  padding: 2px 9px; border-radius: 999px;
  font-family: var(--font-mono);
}
.ctx-count.warn { color: var(--danger); background: var(--danger-soft); }
.ctx-close {
  background: none; border: none;
  color: var(--text-dim); font-size: 16px; cursor: pointer;
  padding: 4px 8px; border-radius: 7px;
  transition: all 0.15s;
}
.ctx-close:hover { color: var(--text); background: var(--bg-hover); }

.ctx-bar { height: 3px; background: var(--bg-hover); margin: 0 20px; border-radius: 2px; overflow: hidden; }
.ctx-bar-fill {
  height: 100%; border-radius: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}
.ctx-bar-fill.warn { background: var(--warn); }
.ctx-bar-fill.full { background: var(--danger); }

.ctx-list {
  flex: 1; overflow-y: auto;
  padding: 8px 12px;
  scrollbar-width: thin;
}
.ctx-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 2px;
  transition: background 0.13s;
  gap: 8px;
}
.ctx-item:hover { background: var(--bg-hover); }
.ctx-item-info { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; }
.ctx-role {
  font-size: 11px; font-weight: 600;
  padding: 1px 7px; border-radius: 5px;
  white-space: nowrap;
}
.ctx-item.user .ctx-role { color: var(--accent); background: var(--accent-soft); }
.ctx-item.assistant .ctx-role { color: var(--text-secondary); background: var(--bg-active); }
.ctx-item.tool .ctx-role { color: var(--warn); background: rgba(217, 165, 87, 0.12); }
.ctx-item.event .ctx-role { color: var(--text-dim); background: var(--bg-hover); }
.ctx-preview {
  font-size: 12.5px; color: var(--text-dim);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  flex: 1; min-width: 0;
}
.ctx-item-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.ctx-time { font-size: 10px; color: var(--text-faint); font-family: var(--font-mono); }
.ctx-del {
  background: none; border: none;
  color: var(--text-faint); font-size: 12px; cursor: pointer;
  padding: 3px 7px; border-radius: 5px;
  opacity: 0; transition: all 0.13s;
}
.ctx-item:hover .ctx-del { opacity: 1; }
@media (hover: none) { .ctx-del { opacity: 1; } }
.ctx-del:hover { color: var(--danger); background: var(--danger-soft); }

.ctx-footer {
  display: flex; gap: 8px;
  padding: 12px 20px 16px;
  border-top: 1px solid var(--border);
}
.ctx-btn {
  flex: 1; padding: 9px 0;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: transparent;
  color: var(--text-secondary); font-size: 12.5px;
  cursor: pointer; transition: all 0.15s;
  font-family: var(--font-ui);
}
.ctx-btn:hover { background: var(--bg-hover); color: var(--text); border-color: var(--border-strong); }
.ctx-btn.summarize:hover { color: var(--accent); border-color: var(--accent-border); background: var(--accent-soft); }
.ctx-btn.clear:hover { color: var(--danger); border-color: var(--danger); background: var(--danger-soft); }

/* ═══ 加载更早 ═══ */
.load-older {
  text-align: center;
  padding: 9px 18px;
  margin: 4px auto 8px;
  color: var(--text-dim);
  font-size: 12.5px;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  transition: all 0.15s;
  max-width: 280px;
}
.load-older:hover { color: var(--text); border-color: var(--border-strong); background: var(--bg-hover); }

/* ═══ 图片 ═══ */
.image-preview-bar {
  display: flex; gap: 8px;
  padding: 8px 0 6px;
  flex-wrap: wrap;
  max-width: var(--chat-max-width);
  margin: 0 auto;
}
.image-preview-item {
  position: relative;
  width: 58px; height: 58px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  flex-shrink: 0;
  animation: pop-in 0.2s var(--ease-spring) both;
}
.image-preview-item img { width: 100%; height: 100%; object-fit: cover; }
.image-preview-item .remove-img {
  position: absolute; top: 2px; right: 2px;
  width: 18px; height: 18px;
  background: rgba(0, 0, 0, 0.6);
  border: none; color: #fff;
  font-size: 11px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  transition: background 0.15s;
}
.image-preview-item .remove-img:hover { background: var(--danger); }
#image-file-input { display: none; }

/* ═══ 认证遮罩 ═══ */
#auth-overlay {
  display: none;
  position: fixed; inset: 0;
  background: var(--bg);
  z-index: 9999;
  align-items: center; justify-content: center;
}
.auth-box { text-align: center; animation: msg-in 0.4s var(--ease-out) both; }
.auth-title {
  color: var(--text-dim);
  font-size: 12px;
  letter-spacing: 3px;
  margin-bottom: 20px;
}
#auth-input {
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 14px;
  padding: 11px 16px;
  outline: none;
  text-align: center;
  width: 220px;
  caret-color: var(--accent);
  transition: border-color 0.2s, box-shadow 0.2s;
}
#auth-input:focus { border-color: var(--accent-border); box-shadow: 0 0 0 3px var(--accent-soft); }
#auth-hint {
  color: var(--danger);
  font-size: 11px;
  margin-top: 10px;
  opacity: 0;
  letter-spacing: 1px;
  transition: opacity 0.2s;
}

/* ═══════════════════════════════════════
   响应式 & iOS
   ═══════════════════════════════════════ */
@media (max-width: 767px) {
  :root { --bubble-max: 86%; }
  .header { padding: 10px 12px; }
  .header-title { font-size: 14px; letter-spacing: 2px; }
  .chat-area { padding: 20px 14px 14px; gap: 12px; }
  .input-wrapper { padding: 4px 10px 12px; }
  /* iOS: 输入字号≥16 防聚焦自动放大 */
  .input-row textarea { font-size: 16px; }
  .msg-editor textarea { font-size: 16px; }
}
@media (min-width: 768px) {
  :root { --bubble-max: 70%; --chat-max-width: 820px; }
}
@media (min-width: 1200px) {
  :root { --chat-max-width: 860px; }
}

@supports (padding: env(safe-area-inset-bottom)) {
  .input-wrapper { padding-bottom: calc(14px + env(safe-area-inset-bottom)); }
  .header { padding-top: calc(12px + env(safe-area-inset-top)); }
  @media (max-width: 767px) {
    .header { padding-top: calc(10px + env(safe-area-inset-top)); }
    .input-wrapper { padding-bottom: calc(12px + env(safe-area-inset-bottom)); }
  }
}
.msg-group .bubble { -webkit-touch-callout: none; }
@media (pointer: coarse) {
  .msg-group .bubble { user-select: text; -webkit-user-select: text; }
}

/* 动画敏感用户尊重系统设置 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}