/* ============================================================
 * Fish Ai 主页基础样式 · 2026-09 深渊极光 · 悬浮舱重构版
 * 设计体系:Abyssal Aurora(深渊极光) · dark-first 双主题
 * 本层职责:重置 / 设计令牌(唯一色源) / 布局骨架 / 组件基础形态
 *   —— .app 网格骨架 + 悬浮玻璃舱侧栏 + 悬浮顶栏胶囊
 *      + 欢迎页 Hero(welcome-hero / wb-chip / wt-grad)
 *      + Bento 建议卡(sc-num / sc-body / sc-go)+ 命令条输入胶囊
 * 主题皮肤增强在 index-ui-v2.css,动效与极光背景在 index-ui-v3.css,
 * 弹窗在 index-modals.css / index-modals-v2.css
 * ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root, html[data-theme="dark"] {
  --bg:#04060d; --bg-soft:#090e1c; --bg-hover:rgba(129,140,248,.09);
  --surface:rgba(13,20,40,.55); --surface-solid:#0b1020; --surface-raised:rgba(16,24,48,.82);
  --border:rgba(139,152,208,.17); --border-soft:rgba(139,152,208,.1);
  --text:#e9efff; --text-secondary:#a4b1d2; --text-muted:#6d799c;
  --primary:#818cf8; --primary-strong:#6366f1; --accent:#22d3ee; --violet:#c084fc;
  --glow:99,102,241; --glow-cyan:34,211,238; --glow-violet:168,85,247;
  --grad-brand:linear-gradient(118deg,#22d3ee 0%,#6366f1 55%,#a855f7 100%);
  --grad-brand-soft:linear-gradient(135deg,rgba(34,211,238,.14),rgba(99,102,241,.14));
  --shadow:0 18px 50px rgba(2,6,23,.55); --shadow-lg:0 30px 80px rgba(2,6,23,.65);
  --glow-shadow:0 0 44px rgba(99,102,241,.3);
  --glass-blur:blur(20px) saturate(1.5);
  --radius:16px; --radius-sm:10px; --sidebar-w:292px;
  --ease-out:cubic-bezier(.22,1,.36,1); --ease-spring:cubic-bezier(.34,1.56,.64,1);
}
html[data-theme="light"] {
  --bg:#f4f7fd; --bg-soft:#ecf1fb; --bg-hover:rgba(79,70,229,.06);
  --surface:rgba(255,255,255,.75); --surface-solid:#fff; --surface-raised:rgba(255,255,255,.92);
  --border:rgba(100,116,160,.18); --border-soft:rgba(100,116,160,.11);
  --text:#151c31; --text-secondary:#4c5975; --text-muted:#8792ab;
  --primary:#4f46e5; --primary-strong:#4338ca; --accent:#0891b2; --violet:#7c3aed;
  --glow:79,70,229;
  --shadow:0 12px 34px rgba(39,50,86,.1); --shadow-lg:0 26px 70px rgba(39,50,86,.18);
  --glow-shadow:0 10px 30px rgba(79,70,229,.22);
}

html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; outline: none; border: none; }

/* 细滚动条 */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-thumb { background: rgba(139, 152, 208, .3); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: rgba(139, 152, 208, .52); }
::-webkit-scrollbar-track { background: transparent; }
html[data-theme="light"] ::-webkit-scrollbar-thumb { background: rgba(100, 116, 160, .32); }
html[data-theme="light"] ::-webkit-scrollbar-thumb:hover { background: rgba(100, 116, 160, .55); }

/* ===== Layout:悬浮舱网格骨架 =====
 * 第一列 = 侧栏胶囊宽(--sidebar-w) + 左右各 14px 悬浮间隙;第二列 1fr 主区。
 * 极光 fx-stage 在 body 底层,内容层整体抬升透出背景。 */
.app {
  display: grid;
  grid-template-columns: calc(var(--sidebar-w) + 28px) minmax(0, 1fr);
  height: 100vh;
  height: 100dvh;
  position: relative;
  z-index: 1;
}

/* ===== Sidebar:悬浮玻璃舱(独立胶囊柱,脱离感) ===== */
.sidebar {
  width: var(--sidebar-w);
  margin: 14px;
  height: calc(100dvh - 28px);
  border-radius: 22px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, .08);
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 100;
  overflow: hidden;
  transition: transform .3s var(--ease-out), box-shadow .3s var(--ease-out);
}
.sidebar-header {
  padding: 15px 14px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-shrink: 0;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 800;
  letter-spacing: -.5px;
  color: var(--text);
  text-decoration: none;
  min-width: 0;
}
.logo-icon {
  width: 34px; height: 34px;
  border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 18px rgba(var(--glow), .45), 0 0 0 1px rgba(var(--glow), .18);
  overflow: hidden;
  transition: transform .18s var(--ease-out);
}
.logo:hover .logo-icon { transform: scale(1.06) rotate(-2deg); }
.logo-icon img { width: 100%; height: 100%; object-fit: cover; display: block; }
.logo .logo-text { background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
/* 折叠功能菜单按钮 */
.nav-fold {
  flex: 0 0 auto; width: 28px; height: 28px;
  display: grid; place-items: center;
  border: 1px solid var(--border-soft); border-radius: 9px;
  color: var(--text-muted); background: transparent;
  transition: color .16s var(--ease-out), border-color .16s var(--ease-out), background .16s var(--ease-out);
}
.nav-fold:hover { color: var(--primary); border-color: rgba(var(--glow), .4); background: var(--bg-hover); }
.nav-fold svg { width: 15px; height: 15px; transition: transform .25s var(--ease-out); }

.new-chat-btn {
  position: relative;
  overflow: hidden;
  margin: 6px 12px 8px;
  min-height: 42px;
  padding: 11px 14px;
  background: var(--grad-brand);
  color: #fff;
  border-radius: 13px;
  font-size: 14px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  box-shadow: var(--glow-shadow), inset 0 1px 0 rgba(255, 255, 255, .2);
  transition: transform .18s var(--ease-out), box-shadow .18s var(--ease-out), filter .18s var(--ease-out);
  flex-shrink: 0;
}
/* 掠光:一道高光在 hover 时从左向右扫过 */
.new-chat-btn::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 0; right: 0;
  background: linear-gradient(105deg, transparent 35%, rgba(255, 255, 255, .3) 50%, transparent 65%);
  transform: translateX(-130%);
  transition: transform .55s var(--ease-out);
  pointer-events: none;
}
.new-chat-btn:hover::after { transform: translateX(130%); }
.new-chat-btn:hover { transform: translateY(-2px); filter: saturate(1.12); box-shadow: 0 0 54px rgba(var(--glow), .42), inset 0 1px 0 rgba(255, 255, 255, .2); }
.new-chat-btn:active { transform: scale(.98); }
.new-chat-btn svg { width: 17px; height: 17px; }

.nav-menu { padding: 4px 10px 6px; display: flex; flex-direction: column; gap: 2px; flex-shrink: 0; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 4px 8px;
  min-height: 38px;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 600;
  width: 100%;
  text-align: left;
  white-space: nowrap;
  transition: background .16s var(--ease-out), color .16s var(--ease-out);
}
.nav-item:hover { background: var(--bg-hover); color: var(--text); }
.nav-ico {
  width: 27px; height: 27px;
  flex: 0 0 auto;
  display: grid; place-items: center;
  border-radius: 8px;
  color: var(--ic, var(--primary));
  background: var(--icbg, rgba(var(--glow), .12));
  transition: transform .16s var(--ease-out), box-shadow .16s var(--ease-out);
}
.nav-ico svg { width: 15px; height: 15px; }
.nav-item:hover .nav-ico { transform: scale(1.08); box-shadow: 0 0 12px rgba(var(--glow), .3); }
.nav-sep { height: 1px; margin: 6px 12px; border: 0; background: linear-gradient(90deg, transparent, var(--border) 22%, var(--border) 78%, transparent); }

/* 霓虹芯片徽章:品牌色 12% 底 + 高亮文字 + 同色边 */
.nav-item .ni-badge,
.nav-item .api-nav-badge,
.nav-item .qq-nav-tag { flex-shrink: 0; margin-left: auto; padding: 1.5px 6px; border-radius: 999px; font-size: 8.5px; font-weight: 800; letter-spacing: .06em; }
.nav-item .ni-badge { color: var(--accent); background: rgba(var(--glow-cyan), .12); border: 1px solid rgba(var(--glow-cyan), .45); }
.nav-item .api-nav-badge { color: var(--primary); background: rgba(var(--glow), .12); border: 1px solid rgba(var(--glow), .45); }
.nav-item .qq-nav-tag { color: var(--violet); background: rgba(var(--glow-violet), .12); border: 1px solid rgba(var(--glow-violet), .45); }

/* 折叠态:头部箭头转下,菜单变 3×3 图标宫格 */
.sidebar.nav-collapsed .nav-fold svg { transform: rotate(180deg); }
.sidebar.nav-collapsed .nav-menu {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 6px; padding: 4px 10px 8px;
}
.sidebar.nav-collapsed .nav-item {
  min-height: 44px; padding: 0; justify-content: center; border-radius: 12px;
}
.sidebar.nav-collapsed .nav-item .nav-label,
.sidebar.nav-collapsed .nav-item .ni-badge,
.sidebar.nav-collapsed .nav-item .api-nav-badge,
.sidebar.nav-collapsed .nav-item .qq-nav-tag { display: none; }
.sidebar.nav-collapsed .nav-ico { width: 32px; height: 32px; border-radius: 10px; }
.sidebar.nav-collapsed .nav-ico svg { width: 18px; height: 18px; }
.sidebar.nav-collapsed .nav-sep { display: none; }

/* ===== 历史记录区 ===== */
.history-label {
  padding: 10px 14px 6px;
  display: flex; align-items: center; justify-content: space-between;
  flex-shrink: 0;
}
.history-label h2 { display: flex; align-items: center; gap: 6px; font-size: 11px; font-weight: 800; letter-spacing: .08em; color: var(--text-muted); text-transform: uppercase; }
.history-label h2 svg { width: 13px; height: 13px; }
.history-actions { display: flex; align-items: center; gap: 3px; }
.history-action { width: 26px; height: 26px; display: flex; align-items: center; justify-content: center; color: var(--text-muted); border-radius: 8px; transition: all .15s var(--ease-out); }
.history-action svg { width: 13px; height: 13px; }
.history-action:hover { color: var(--primary); background: var(--bg-hover); }
.history-action.danger:hover { color: #ef4444; background: rgba(239, 68, 68, .12); }
.history-action#toggleHistoryBtn svg { transition: transform .2s var(--ease-out); }
.sidebar.history-collapsed .history-action#toggleHistoryBtn svg { transform: rotate(-90deg); }
.sidebar.history-collapsed .history-list { display: none; }
.sidebar.history-collapsed .history-label { padding-bottom: 12px; }

.history-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 0 10px 8px;
}
.history-item {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: background .15s var(--ease-out), color .15s var(--ease-out), transform .15s var(--ease-out);
  position: relative;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
}
.history-item:hover { background: var(--bg-hover); color: var(--text); transform: translateX(2px); }
/* 当前会话:渐变左边条 + 品牌辉光 */
.history-item.active {
  background: linear-gradient(90deg, rgba(var(--glow), .18), transparent 82%);
  color: var(--primary);
}
.history-item.active::before {
  content: ""; position: absolute; left: 0; top: 22%; bottom: 22%; width: 3px;
  border-radius: 0 3px 3px 0; background: var(--grad-brand);
  box-shadow: 0 0 10px rgba(var(--glow), .55);
}
.history-item svg { width: 14px; height: 14px; flex-shrink: 0; opacity: .75; }
.history-item .h-title { overflow: hidden; text-overflow: ellipsis; flex: 1; }
.history-item .del-btn,
.history-item .ren-btn,
.history-item .pin-btn {
  display: flex;
  width: 22px; height: 22px;
  border-radius: 5px;
  align-items: center; justify-content: center;
  color: var(--text-muted);
  flex-shrink: 0;
  opacity: 0.55;
  transition: opacity .15s var(--ease-out), color .15s var(--ease-out), background .15s var(--ease-out);
}
/* 重命名 / 置顶按钮平时隐藏,悬停整行时出现(已置顶的图钉常亮) */
.history-item .ren-btn,
.history-item .pin-btn { opacity: 0; }
.history-item .del-btn:hover { color: #ef4444; background: rgba(239, 68, 68, .12); opacity: 1; }
.history-item .ren-btn:hover,
.history-item .pin-btn:hover { color: var(--primary); background: var(--bg-hover); opacity: 1; }
.history-item:hover .del-btn,
.history-item:hover .ren-btn,
.history-item:hover .pin-btn { opacity: 1; }
.history-item .pin-btn.is-on { color: var(--primary); opacity: 1; }
/* 置顶项:前置图钉标志用主题色 */
.history-item .h-pin-flag { display: flex; flex-shrink: 0; color: var(--primary); }
.history-item .h-pin-flag svg { opacity: 1; }
.history-item.pinned .h-title { color: var(--text-secondary); font-weight: 600; }
/* 触屏设备没有 hover,操作按钮需要常显 */
@media (hover: none) {
  .history-item .ren-btn,
  .history-item .pin-btn { opacity: 1; }
}
.history-empty { padding: 26px 14px; text-align: center; color: var(--text-muted); font-size: 13px; }
.history-empty .he-icon { width: 44px; height: 44px; margin: 0 auto 8px; display: grid; place-items: center; border-radius: 14px; color: var(--primary); background: var(--grad-brand-soft); border: 1px solid var(--border-soft); }
.history-empty .he-icon svg { width: 22px; height: 22px; }
.history-empty p { color: var(--text-secondary); font-size: 12.5px; font-weight: 700; }
.history-empty small { display: block; margin-top: 3px; color: var(--text-muted); font-size: 10.5px; }

/* ===== 侧栏底部用户舱 ===== */
.sidebar-footer { padding: 10px 12px 12px; flex-shrink: 0; }
.user-box {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(var(--glow), .09), rgba(var(--glow-violet), .06));
  cursor: pointer;
  transition: transform .18s var(--ease-out), background .15s var(--ease-out), border-color .18s var(--ease-out), box-shadow .18s var(--ease-out);
}
.user-box:hover { background: var(--bg-hover); border-color: rgba(var(--glow), .4); box-shadow: 0 8px 20px rgba(var(--glow), .16); }
.avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 600; font-size: 14px;
  flex-shrink: 0;
  overflow: hidden;
  border: 2px solid transparent;
  background: linear-gradient(var(--surface-solid), var(--surface-solid)) padding-box, var(--grad-brand) border-box;
  box-shadow: 0 0 12px rgba(var(--glow), .35);
}
.avatar svg { display: block; }
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.user-info { flex: 1; min-width: 0; }
.user-name { font-size: 13px; font-weight: 800; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-status { font-size: 10.5px; color: var(--text-muted); }
.user-status.logged { color: var(--accent); }
.user-status.logged::before {
  content: ''; display: inline-block; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 8px rgba(var(--glow-cyan), .75);
  margin-right: 4px; vertical-align: 1px;
}
/* 积分宝石:紫水晶霓虹辉光 */
.user-points-box {
  flex-shrink: 0; display: flex; align-items: center; gap: 7px;
  padding: 5px 11px 5px 8px; border-radius: 12px;
  background: rgba(var(--glow-violet), .1);
  border: 1px solid rgba(var(--glow-violet), .28);
}
.up-gem { width: 17px; height: 17px; display: block; filter: drop-shadow(0 0 6px rgba(var(--glow-violet), .6)); }
.up-gem svg { width: 100%; height: 100%; display: block; }
.up-copy { text-align: right; line-height: 1.15; }
.up-copy small { display: block; font-size: 8.5px; color: var(--text-muted); font-weight: 700; letter-spacing: .04em; }
.up-copy b { font: 800 13px/1.3 ui-monospace, Consolas, monospace; color: var(--violet); text-shadow: 0 0 10px rgba(var(--glow-violet), .45); }

/* ===== Main ===== */
.main {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: transparent;
  position: relative;
}
/* 悬浮玻璃顶栏:不再通顶贴边,独立胶囊条 */
.main-header {
  height: 62px;
  flex-shrink: 0;
  margin: 12px 14px 0;
  padding: 0 10px 0 16px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, .08);
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 50;
}
.menu-toggle {
  display: none;
  width: 38px; height: 38px;
  border-radius: 11px;
  align-items: center; justify-content: center;
  color: var(--text);
  border: 1px solid var(--border);
  background: var(--surface-raised);
  transition: color .15s var(--ease-out), border-color .15s var(--ease-out), background .15s var(--ease-out);
}
.menu-toggle:hover { background: var(--bg-hover); }
.menu-toggle.is-open { color: var(--primary); border-color: rgba(var(--glow), .4); background: rgba(var(--glow), .12); }
.menu-toggle svg { width: 22px; height: 22px; transition: transform .2s var(--ease-out); }
.menu-toggle.is-open svg { transform: rotate(90deg); }
.header-side { flex: 1; display: flex; align-items: center; gap: 10px; min-width: 0; }
.header-side.right { justify-content: flex-end; }
.chat-title { font-size: 13px; font-weight: 650; letter-spacing: .02em; color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ===== 模型选择器(顶部居中显眼) ===== */
.model-picker { position: relative; }
.model-select {
  position: relative;
  display: flex; align-items: center; gap: 10px;
  padding: 8px 13px 8px 8px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--surface-raised);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  cursor: pointer;
  transition: border-color .18s var(--ease-out), box-shadow .18s var(--ease-out), transform .18s var(--ease-out);
  box-shadow: 0 8px 25px rgba(var(--glow), .13), inset 0 1px 0 rgba(255, 255, 255, .08);
  min-width: 260px;
}
/* 渐变发丝边(::after 1px 品牌渐变描边) */
.model-select::after {
  content: ""; position: absolute; inset: -1px; border-radius: inherit; padding: 1px; pointer-events: none;
  background: var(--grad-brand);
  -webkit-mask: linear-gradient(currentColor 0 0) content-box, linear-gradient(currentColor 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(currentColor 0 0) content-box, linear-gradient(currentColor 0 0);
  mask-composite: exclude;
  opacity: .35;
  transition: opacity .18s var(--ease-out);
}
.model-select:hover,
.model-select.open {
  border-color: rgba(var(--glow), .55);
  box-shadow: 0 12px 32px rgba(var(--glow), .22), var(--glow-shadow);
  transform: translateY(-1px);
}
.model-select:hover::after,
.model-select.open::after { opacity: 1; }
.ms-icon {
  width: 32px; height: 32px;
  background: var(--grad-brand);
  border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  box-shadow: 0 3px 10px rgba(var(--glow), .45);
  flex-shrink: 0;
}
.ms-icon svg { width: 18px; height: 18px; display: block; }
.ms-info { flex: 1; display: flex; flex-direction: column; align-items: flex-start; line-height: 1.15; min-width: 0; }
.ms-name { font-size: 14.5px; font-weight: 700; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 130px; }
.ms-price { font-size: 11.5px; color: var(--primary); font-weight: 600; margin-top: 2px; white-space: nowrap; }
.ms-arrow {
  width: 16px; height: 16px;
  color: var(--text-muted);
  transition: transform .2s var(--ease-out);
  flex-shrink: 0;
}
.model-select.open .ms-arrow { transform: rotate(180deg); color: var(--primary); }

/* 下拉面板 */
.model-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-raised);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: 19px;
  box-shadow: var(--shadow-lg), var(--glow-shadow);
  width: 540px;
  max-width: 92vw;
  max-height: 70vh;
  overflow: hidden;
  z-index: 150;
  animation: dropDown .22s var(--ease-out);
}
@keyframes dropDown {
  from { opacity: 0; transform: translateX(-50%) translateY(-8px) scale(.97); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0) scale(1); }
}
.model-picker.open .model-dropdown { display: flex; flex-direction: column; }

/* 分类 Tab */
.md-tabs {
  display: flex; gap: 4px;
  padding: 8px 8px 0;
  border-bottom: 1px solid var(--border-soft);
}
.md-tab {
  flex: 1;
  padding: 9px 12px;
  border: none;
  background: transparent;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  border-radius: 10px 10px 0 0;
  cursor: pointer;
  transition: all .18s var(--ease-out);
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
.md-tab .md-tab-count {
  font-size: 10.5px;
  background: rgba(var(--glow), .12);
  color: var(--text-muted);
  padding: 1px 6px;
  border-radius: 8px;
  font-weight: 700;
}
.md-tab.active {
  color: var(--primary);
  background: linear-gradient(180deg, transparent, rgba(var(--glow), .08));
  box-shadow: inset 0 -2px 0 var(--primary);
}
.md-tab.active .md-tab-count { background: var(--primary-strong); color: #fff; }

/* 搜索框 */
.md-search {
  padding: 10px 12px 8px;
  position: relative;
}
.md-search input {
  width: 100%;
  padding: 9px 12px 9px 34px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 13px;
  color: var(--text);
  transition: all .15s var(--ease-out);
  font-family: inherit;
}
.md-search input:focus { border-color: rgba(var(--glow), .55); background: var(--surface-solid); outline: none; box-shadow: 0 0 0 3px rgba(var(--glow), .14); }
.md-search svg {
  position: absolute;
  left: 22px; top: 50%; transform: translateY(-50%);
  width: 14px; height: 14px;
  color: var(--text-muted);
}

/* 列表区 */
.md-list {
  flex: 1; overflow-y: auto;
  padding: 4px 8px 10px;
}
.md-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 10px;
  border-radius: 11px;
  cursor: pointer;
  transition: all .15s var(--ease-out);
  border: 1px solid transparent;
  position: relative;
}
.md-item:hover { background: var(--bg-hover); border-color: var(--border-soft); }
/* active 条目:渐变左边条 + 品牌软渐变底 */
.md-item.active {
  background: var(--grad-brand-soft);
  border-color: rgba(var(--glow), .4);
}
.md-item.active::before {
  content: ""; position: absolute; left: 4px; top: 22%; bottom: 22%; width: 3px;
  border-radius: 99px; background: var(--grad-brand);
  box-shadow: 0 0 10px rgba(var(--glow), .6);
}
.md-item-icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  background: var(--grad-brand-soft);
  border: 1px solid var(--border-soft);
  transition: all .15s var(--ease-out);
}
.md-item-icon svg { width: 20px; height: 20px; display: block; color: var(--text-secondary); }
.md-item.active .md-item-icon {
  background: var(--grad-brand) !important;
  color: #fff;
  box-shadow: 0 4px 14px rgba(var(--glow), .45);
  transform: scale(1.05);
}
.md-item.active .md-item-icon svg path,
.model-select.open .ms-icon svg path { fill: #fff !important; }
.md-item.active .md-item-icon svg rect,
.model-select.open .ms-icon svg rect { fill: #fff !important; }
.md-item-main { flex: 1; min-width: 0; }
.md-item-name {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text);
  display: flex; align-items: center; gap: 6px;
  flex-wrap: wrap;
}
.md-item-tags {
  display: flex; gap: 4px; margin-top: 4px;
  flex-wrap: wrap;
}
.md-tag {
  font-size: 10px;
  font-weight: 700;
  padding: 1.5px 6px;
  border-radius: 5px;
  white-space: nowrap;
  letter-spacing: .2px;
  border: 1px solid transparent;
}
/* 霓虹标签:低透明品牌底 + 高亮文字 + 同色边 */
.md-tag-vendor    { background: rgba(168, 85, 247, .12); border-color: rgba(168, 85, 247, .42); color: #c084fc; }
.md-tag-billing   { background: rgba(34, 211, 238, .13); border-color: rgba(34, 211, 238, .3); color: #22d3ee; }
.md-tag-mm        { background: rgba(99, 102, 241, .13); border-color: rgba(99, 102, 241, .3); color: #818cf8; }
.md-tag-fast      { background: rgba(99, 102, 241, .13); border-color: rgba(99, 102, 241, .3); color: #818cf8; }
.md-tag-pro       { background: linear-gradient(135deg, #ef4444, #f59e0b); border-color: transparent; color: #fff; }
.md-tag-cheap     { background: rgba(34, 211, 238, .13); border-color: rgba(34, 211, 238, .3); color: #22d3ee; }
.md-tag-powerful  { background: rgba(236, 72, 153, .12); border-color: rgba(236, 72, 153, .42); color: #f472b6; }
html[data-theme="light"] .md-tag-vendor   { color: #7e22ce; }
html[data-theme="light"] .md-tag-billing  { color: #0e7490; }
html[data-theme="light"] .md-tag-mm       { color: #4338ca; }
html[data-theme="light"] .md-tag-fast     { color: #4338ca; }
html[data-theme="light"] .md-tag-cheap    { color: #0e7490; }
html[data-theme="light"] .md-tag-powerful { color: #be185d; }
.md-item-price {
  text-align: right;
  font-size: 12px;
  font-weight: 800;
  color: var(--primary);
  flex-shrink: 0;
  white-space: nowrap;
  line-height: 1.3;
}
.md-item-price .mp-out { color: var(--text-muted); font-weight: 600; font-size: 10.5px; }
.md-item.active .md-item-price { color: var(--primary-strong); }
.md-item-check {
  position: absolute;
  top: 8px; right: 8px;
  width: 18px; height: 18px;
  background: var(--primary-strong);
  color: #fff;
  border-radius: 50%;
  display: none;
  align-items: center; justify-content: center;
  font-size: 12px;
  font-weight: 800;
  box-shadow: 0 0 12px rgba(var(--glow), .4);
}
.md-item.active .md-item-check { display: flex; }
.md-empty {
  text-align: center;
  padding: 32px 0;
  color: var(--text-muted);
  font-size: 13px;
}

/* 主题切换开关(深色默认:滑块居右) */
.theme-toggle { width: 56px; height: 38px; display: grid; place-items: center; border-radius: 13px; }
.theme-toggle:focus-visible { outline: 3px solid rgba(var(--glow), .28); outline-offset: 2px; }
.theme-toggle-track {
  position: relative;
  width: 50px;
  height: 28px;
  display: block;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: linear-gradient(135deg, rgba(var(--glow-cyan), .18), rgba(var(--glow-violet), .18));
  box-shadow: inset 0 2px 5px rgba(2, 6, 23, .3);
  transition: background .3s var(--ease-out), border-color .3s var(--ease-out);
}
.theme-toggle-thumb {
  position: absolute; left: 3px; top: 3px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .95);
  box-shadow: 0 3px 9px rgba(2, 6, 23, .4);
  transform: translateX(22px);
  transition: transform .32s var(--ease-spring);
  z-index: 2;
}
.theme-icon { position: absolute; top: 7px; width: 13px; height: 13px; z-index: 3; transition: opacity .2s var(--ease-out); }
.theme-icon.sun { left: 7px; color: rgba(245, 158, 11, .9); opacity: .35; }
.theme-icon.moon { right: 7px; color: var(--primary); opacity: 1; }
html[data-theme="light"] .theme-toggle-thumb { transform: none; }
html[data-theme="light"] .theme-icon.sun { opacity: 1; }
html[data-theme="light"] .theme-icon.moon { opacity: .4; }

/* ===== chat body ===== */
.chat-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  scroll-behavior: auto;
  position: relative;
}

/* ===== 欢迎页:极光首屏 Hero(#welcome 由 JS 设 display:flex,按 flex 列设计) ===== */
.welcome {
  min-height: 100%;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 28px 28px 24px;
  text-align: center;
}
.welcome-hero {
  display: flex; flex-direction: column;
  align-items: center;
  max-width: 720px;
}
/* logo 徽章:圆角方形 + 径向光晕 + 外圈光环(.wl-ring) */
.welcome-logo {
  position: relative;
  width: 84px; height: 84px;
  border-radius: 26px;
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px;
  box-shadow: 0 0 0 6px rgba(var(--glow), .06), 0 18px 45px rgba(var(--glow), .25), 0 0 62px rgba(var(--glow), .32);
  transform: rotate(-3deg);
}
.welcome-logo img { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: inherit; }
.wl-ring {
  position: absolute;
  inset: -10px;
  border-radius: 34px;
  border: 1px solid rgba(var(--glow), .35);
  box-shadow: 0 0 24px rgba(var(--glow), .16), inset 0 0 18px rgba(var(--glow), .08);
  pointer-events: none;
}
/* 外层虚线装饰环(旋转动画在 v3 动效层) */
.wl-ring::before {
  content: "";
  position: absolute;
  inset: -9px;
  border-radius: inherit;
  border: 1px dashed rgba(var(--glow-cyan), .34);
}
/* 玻璃状态芯片 */
.welcome-badges {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 8px;
  margin-bottom: 22px;
}
.wb-chip {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(10px) saturate(1.4);
  -webkit-backdrop-filter: blur(10px) saturate(1.4);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .01em;
  white-space: nowrap;
}
.wb-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 10px rgba(52, 211, 153, .8);
  flex-shrink: 0;
}
/* 两行大标题:首行实色,次行品牌渐变文字 + 辉光 */
.welcome-title {
  font-size: clamp(38px, 4.8vw, 56px);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.14;
  color: var(--text);
}
.wt-grad {
  display: block;
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 4px 28px rgba(var(--glow), .38));
}
.welcome-desc {
  max-width: 640px;
  margin: 16px 0 34px;
  color: var(--text-secondary);
  font-size: 15.5px;
  line-height: 1.75;
}

/* ===== Bento 建议卡:2×2 网格,横排(编号 · 图标 · 正文 · 箭头) ===== */
.suggest-cards {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 15px;
  width: 100%;
  max-width: 780px;
}
.suggest-card {
  --sc: 99, 102, 241; /* 每卡强调色,仅作用于 icon tile 与编号渐变 */
  position: relative;
  display: flex; align-items: center; gap: 14px;
  min-height: 96px;
  padding: 18px 18px 18px 16px;
  text-align: left;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, .07);
  cursor: pointer;
  overflow: hidden;
  transition: transform .18s var(--ease-out), box-shadow .18s var(--ease-out), border-color .18s var(--ease-out);
}
.suggest-card:nth-child(1) { --sc: 34, 211, 238; }
.suggest-card:nth-child(2) { --sc: 99, 102, 241; }
.suggest-card:nth-child(3) { --sc: 168, 85, 247; }
.suggest-card:nth-child(4) { --sc: 244, 63, 94; }
/* 大号等宽编号:右上角幽灵数字,强调色渐隐 */
.sc-num {
  position: absolute;
  top: 4px; right: 14px;
  font: 800 42px/1 ui-monospace, Consolas, Menlo, monospace;
  letter-spacing: -.05em;
  background: linear-gradient(165deg, rgba(var(--sc), .34), rgba(var(--sc), .03));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  pointer-events: none;
  user-select: none;
  transition: opacity .18s var(--ease-out);
}
/* 强调色图标 tile */
.sc-icon {
  flex: 0 0 44px;
  width: 44px; height: 44px;
  border-radius: 13px;
  display: grid; place-items: center;
  color: rgb(var(--sc));
  background: rgba(var(--sc), .13);
  border: 1px solid rgba(var(--sc), .3);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1), 0 4px 14px rgba(var(--sc), .14);
  transition: box-shadow .18s var(--ease-out), transform .18s var(--ease-out);
}
.sc-icon svg { width: 20px; height: 20px; }
.sc-body { flex: 1; min-width: 0; }
.sc-title { font-size: 14.5px; font-weight: 700; color: var(--text); margin-bottom: 3px; letter-spacing: -.01em; }
.sc-desc { font-size: 12.5px; color: var(--text-muted); line-height: 1.5; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
/* 右侧箭头圆钮:hover 亮起并右移 */
.sc-go {
  flex: 0 0 auto;
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-soft);
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1;
  transition: color .18s var(--ease-out), background .18s var(--ease-out), border-color .18s var(--ease-out), box-shadow .18s var(--ease-out), transform .18s var(--ease-out);
}
.suggest-card:hover {
  transform: translateY(-3px);
  border-color: rgba(var(--sc), .45);
  box-shadow: var(--shadow-lg), 0 0 34px rgba(var(--sc), .2);
}
.suggest-card:hover .sc-icon { box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12), 0 6px 18px rgba(var(--sc), .35); }
.suggest-card:hover .sc-num { background: linear-gradient(165deg, rgba(var(--sc), .6), rgba(var(--sc), .1)); -webkit-background-clip: text; background-clip: text; }
.suggest-card:hover .sc-go {
  color: #fff;
  background: rgba(var(--sc), .92);
  border-color: transparent;
  box-shadow: 0 0 16px rgba(var(--sc), .5);
  transform: translateX(3px);
}

/* ===== messages ===== */
.messages { padding: 26px 0 8px; max-width: 900px; margin: 0 auto; width: 100%; }
.msg {
  padding: 12px 28px;
  display: flex;
  gap: 15px;
  content-visibility: auto;
  contain-intrinsic-size: auto 180px;
}
.msg-avatar {
  width: 37px; height: 37px;
  border-radius: 12px;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 13px;
  overflow: hidden;
  box-shadow: 0 7px 16px rgba(2, 6, 23, .35), 0 0 0 1px var(--border-soft);
}
.msg.user .msg-avatar { background: linear-gradient(135deg, #34d399, #10b981); }
.msg.assistant .msg-avatar { background: var(--grad-brand); box-shadow: 0 7px 16px rgba(2, 6, 23, .35), 0 0 18px rgba(var(--glow), .35), 0 0 0 1px var(--border-soft); }
.msg-avatar img { width: 100%; height: 100%; object-fit: cover; }
.msg-content { flex: 1; min-width: 0; padding-top: 4px; }
.msg-content .role { font-size: 13px; font-weight: 750; margin-bottom: 3px; }
.msg.user .role { color: #10b981; }
.msg.assistant .role { color: var(--primary); }
.msg-bubble {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
  word-wrap: break-word;
  overflow-wrap: break-word;
}
/* 错误消息气泡:霓虹红边 + 红色玻璃底,便于一眼区分 */
.msg.assistant.msg-error .msg-bubble {
  background: rgba(239, 68, 68, .09);
  border: 1px solid rgba(239, 68, 68, .38);
  color: #fca5a5;
  box-shadow: 0 0 24px rgba(239, 68, 68, .12);
}
.msg.assistant.msg-error .msg-bubble p { color: #fca5a5; }
.msg.assistant.msg-error .msg-bubble code:not(pre code) { background: rgba(248, 113, 113, .16); color: #fecaca; }
.msg.assistant.msg-error .msg-bubble strong { color: #fecaca; }
html[data-theme="light"] .msg.assistant.msg-error .msg-bubble { background: rgba(254, 226, 226, .65); border-color: #fca5a5; color: #991b1b; }
html[data-theme="light"] .msg.assistant.msg-error .msg-bubble p { color: #991b1b; }
html[data-theme="light"] .msg.assistant.msg-error .msg-bubble code:not(pre code) { background: #fecaca; color: #7f1d1d; }
html[data-theme="light"] .msg.assistant.msg-error .msg-bubble strong { color: #7f1d1d; }

/* 用户消息气泡容器 + 底部复制按钮 */
.msg.user .msg-bubble { width: fit-content; padding: 10px 14px; border: 1px solid rgba(var(--glow), .22); border-radius: 18px 6px 18px 18px; background: rgba(99, 102, 241, .12); backdrop-filter: blur(14px) saturate(1.3); -webkit-backdrop-filter: blur(14px) saturate(1.3); }
.msg.user .msg-bubble-wrap { position: relative; display: inline-block; max-width: 100%; }
.msg.user .user-copy-btn {
  display: flex; align-items: center; gap: 3px;
  padding: 3px 7px;
  background: var(--surface-raised);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 11px;
  color: var(--text-secondary);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(2, 6, 23, .2);
  opacity: 0;
  transform: translateY(2px);
  transition: opacity .15s var(--ease-out), transform .15s var(--ease-out), color .15s var(--ease-out), background .15s var(--ease-out), border-color .15s var(--ease-out);
  z-index: 2;
}
.msg.user .user-copy-btn svg { width: 12px; height: 12px; }
/* 底部按钮:常驻在气泡下方右侧 */
.msg.user .user-copy-bottom {
  display: flex; justify-content: flex-end;
  margin-top: 4px;
}
.msg.user .user-copy-btn-bottom {
  position: relative;
  opacity: 0;
  transform: translateY(2px);
}
.msg.user:hover .user-copy-btn-bottom,
.msg.user .user-copy-btn-bottom:focus { opacity: 1; transform: translateY(0); }
/* 按钮 hover/copied 状态 */
.msg.user .user-copy-btn:hover { color: var(--primary); border-color: rgba(var(--glow), .45); }
.msg.user .user-copy-btn.copied {
  background: #10b981; color: #fff; border-color: #10b981;
  opacity: 1; transform: translateY(0);
}
/* 手机端不支持 hover,常驻显示 */
@media (hover: none) {
  .msg.user .user-copy-btn { opacity: 1; transform: translateY(0); }
}

/* 助手回答底部操作 */
.assistant-actions { display: flex; align-items: center; margin-top: 8px; }
.assistant-copy-btn {
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 30px; padding: 5px 10px;
  border: 1px solid var(--border); border-radius: 7px;
  background: var(--surface); color: var(--text-secondary);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  font-size: 12px; font-weight: 600;
  cursor: pointer;
  transition: color .15s var(--ease-out), background .15s var(--ease-out), border-color .15s var(--ease-out), box-shadow .15s var(--ease-out), transform .15s var(--ease-out);
}
.assistant-copy-btn svg { width: 14px; height: 14px; }
.assistant-copy-btn:hover { color: var(--primary); background: var(--bg-hover); border-color: rgba(var(--glow), .4); box-shadow: 0 0 16px rgba(var(--glow), .18); transform: translateY(-1px); }
.assistant-copy-btn.copied { color: #34d399; background: rgba(16, 185, 129, .12); border-color: rgba(52, 211, 153, .45); box-shadow: none; transform: none; }
html[data-theme="light"] .assistant-copy-btn.copied { color: #047857; }
.msg.assistant.msg-error .assistant-copy-btn { background: rgba(239, 68, 68, .1); border-color: rgba(239, 68, 68, .35); color: #fca5a5; }
.msg.assistant.msg-error .assistant-copy-btn:hover { background: rgba(239, 68, 68, .16); border-color: #f87171; }

/* 代码块:让 .code-wrap 成为定位上下文,便于悬浮按钮 */
.code-wrap { position: relative; }

/* 代码块底部复制按钮:悬浮在右下角的幽灵图标按钮 */
.copy-btn-bottom {
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 30px;
  height: 30px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(11, 16, 32, .85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(139, 152, 208, .28);
  color: #a4b1d2;
  border-radius: 8px;
  cursor: pointer;
  padding: 0;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity .18s var(--ease-out), transform .18s var(--ease-out), background .18s var(--ease-out), border-color .18s var(--ease-out), color .18s var(--ease-out), box-shadow .18s var(--ease-out);
  z-index: 3;
  box-shadow: 0 2px 8px rgba(2, 6, 23, .3);
}
.copy-btn-bottom svg { width: 14px; height: 14px; }
/* 鼠标悬停代码块时显示,复制后常驻(.copied) */
.code-wrap:hover .copy-btn-bottom,
.copy-btn-bottom:focus,
.copy-btn-bottom.copied {
  opacity: 1;
  transform: translateY(0);
}
.copy-btn-bottom:hover {
  background: rgba(11, 16, 32, .95);
  border-color: rgba(var(--glow), .55);
  color: #67e8f9;
  box-shadow: 0 4px 14px rgba(var(--glow), .25);
}
/* 复制成功态 */
.copy-btn-bottom.copied,
.copy-btn.copied {
  background: #10b981 !important;
  color: #fff !important;
  border-color: #10b981 !important;
  opacity: 1;
}
/* 手机端无法 hover,常驻显示 */
@media (hover: none) {
  .copy-btn-bottom { opacity: 1; transform: translateY(0); }
}
.msg-bubble p { margin-bottom: 10px; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble ul, .msg-bubble ol { margin: 8px 0 10px 22px; }
.msg-bubble li { margin-bottom: 4px; }
.msg-bubble a { color: var(--primary); text-decoration: none; border-bottom: 1px solid rgba(var(--glow), .35); transition: border-color .15s var(--ease-out), color .15s var(--ease-out); }
.msg-bubble a:hover { color: var(--primary-strong); border-bottom-color: var(--primary-strong); }
.msg-bubble strong { font-weight: 600; }
.msg-bubble blockquote { border-left: 3px solid var(--primary); padding: 4px 12px; margin: 8px 0; color: var(--text-secondary); background: rgba(var(--glow), .06); border-radius: 0 6px 6px 0; }

/* Markdown 数据表格 */
.md-table-card {
  margin: 16px 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow);
}
.md-table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 43px;
  padding: 7px 9px 7px 15px;
  border-bottom: 1px solid var(--border-soft);
  background: rgba(var(--glow), .06);
}
.md-table-toolbar > span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .03em;
}
.md-table-toolbar > span i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(var(--glow), .14), 0 0 10px rgba(var(--glow), .5);
}
.md-table-copy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  padding: 5px 10px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface-raised);
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
  transition: .15s var(--ease-out);
}
.md-table-copy svg { width: 14px; height: 14px; }
.md-table-copy:hover { color: var(--primary); border-color: rgba(var(--glow), .45); background: var(--surface-solid); box-shadow: 0 3px 10px rgba(var(--glow), .16); transform: translateY(-1px); }
.md-table-copy.copied { color: #34d399; border-color: rgba(52, 211, 153, .45); background: rgba(16, 185, 129, .12); transform: none; }
html[data-theme="light"] .md-table-copy.copied { color: #047857; }
.md-table-scroll { width: 100%; overflow-x: auto; scrollbar-width: thin; scrollbar-color: rgba(139, 152, 208, .35) transparent; }
.md-table-card table { width: 100%; min-width: 520px; border-spacing: 0; border-collapse: separate; font-size: 14px; line-height: 1.5; }
.md-table-card th,
.md-table-card td { padding: 12px 15px; text-align: left; vertical-align: top; border-right: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
.md-table-card th:last-child,
.md-table-card td:last-child { border-right: 0; }
.md-table-card tbody tr:last-child td { border-bottom: 0; }
.md-table-card th { color: var(--text); background: var(--bg-hover); font-size: 13px; font-weight: 750; white-space: nowrap; }
.md-table-card td { color: var(--text-secondary); background: transparent; }
.md-table-card tbody tr:nth-child(even) td { background: rgba(var(--glow), .04); }
.md-table-card tbody tr:hover td { background: rgba(var(--glow), .09); }
.md-table-card code { color: var(--violet); border-radius: 4px; background: rgba(var(--glow), .12); font-size: 12px; }
html[data-theme="light"] .md-table-card code { color: #7e22ce; }

@media (max-width: 600px) {
  .md-table-card { margin: 13px 0; border-radius: 10px; }
  .md-table-card table { min-width: 460px; font-size: 13px; }
  .md-table-card th, .md-table-card td { padding: 10px 12px; }
  .md-table-copy { min-height: 32px; }
}

/* code block —— 终端卡:背景走 --surface-solid,随明/暗主题切换(高亮样式同步 atom-one-light/dark) */
.code-wrap { margin: 12px 0; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid rgba(var(--glow), .25); background: var(--surface-solid); position: relative; box-shadow: 0 16px 44px rgba(2, 6, 23, .45); }
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 14px;
  background: rgba(139, 152, 208, .07);
  font-size: 12.5px;
  color: #8b9bd4;
  border-bottom: 1px solid rgba(var(--glow), .2);
  position: relative;
}
/* 终端三色点(红/黄/绿)由 .code-head-left > .code-dots 渲染(index-ui-v3.css),此处不再用 ::before 重复画点 */
.code-head-actions { display: flex; align-items: center; gap: 4px; }
.code-lang { font-weight: 600; text-transform: uppercase; letter-spacing: .3px; color: var(--text-secondary); }
.code-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 12px;
  color: var(--text-secondary);
  transition: all .15s var(--ease-out);
}
.code-toggle:hover { background: rgba(139, 152, 208, .12); color: var(--text); }
.code-toggle svg { width: 13px; height: 13px; transition: transform .2s var(--ease-out); }
.code-wrap.is-collapsed .code-toggle svg { transform: rotate(-90deg); }
.code-body { display: block; }
.code-wrap.is-collapsed .code-body { display: none; }
.code-foot {
  display: flex;
  justify-content: center;
  padding: 6px 10px;
  background: rgba(139, 152, 208, .05);
  border-top: 1px solid rgba(var(--glow), .18);
}
.code-wrap.is-collapsed .code-foot { border-top: 0; }
.copy-btn {
  display: flex; align-items: center; gap: 5px;
  padding: 4px 9px;
  border-radius: 6px;
  font-size: 12px;
  color: var(--text-secondary);
  transition: all .15s var(--ease-out);
}
.copy-btn:hover { background: rgba(139, 152, 208, .12); color: var(--text); }
.copy-btn svg { width: 13px; height: 13px; }
.code-wrap pre { margin: 0; padding: 14px 16px; overflow-x: auto; background: transparent; color: #c9d4ee; }
.code-wrap pre code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.5px; line-height: 1.6; background: transparent !important; padding: 0 !important; }
/* 浅色模式:头部/底栏/代码文字切浅色(token 配色由 atom-one-light 提供,深底深字不可读) */
html[data-theme="light"] .code-head { background: rgba(79, 70, 229, .05); color: var(--text-secondary); }
html[data-theme="light"] .code-foot { background: rgba(79, 70, 229, .035); }
html[data-theme="light"] .code-toggle:hover,
html[data-theme="light"] .copy-btn:hover { background: rgba(79, 70, 229, .09); }
html[data-theme="light"] .code-wrap pre { color: #3d4666; }
html[data-theme="light"] .code-wrap { box-shadow: 0 12px 32px rgba(39, 50, 86, .1); }
.msg-bubble code:not(pre code) { background: rgba(var(--glow), .14); color: var(--violet); padding: 2px 6px; border-radius: 5px; font-family: Consolas, Menlo, monospace; font-size: 13px; }
html[data-theme="light"] .msg-bubble code:not(pre code) { color: #7e22ce; }

/* ===== 流式输出(SSE)优化 ===== */
/* 思考中骨架屏(AI 未响应时显示)::before 平移扫光,纯 transform 动画 */
.skeleton { padding: 2px 0; }
.sk-line {
  position: relative;
  height: 11px;
  margin-bottom: 8px;
  border-radius: 4px;
  overflow: hidden;
  background: rgba(var(--glow), .09);
}
.sk-line::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(var(--glow), .2), transparent);
  transform: translateX(-100%);
  animation: skShimmer 1.4s ease-in-out infinite;
}
.sk-line:last-child { margin-bottom: 0; }
.sk-line.short { width: 55%; }
@keyframes skShimmer { to { transform: translateX(100%); } }
.stream-status {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
  opacity: .85;
}
.stream-status.stopped {
  color: #f87171;
  font-weight: 600;
}
html[data-theme="light"] .stream-status.stopped { color: #dc2626; }
/* 已停止的消息结尾标识 */
.msg-stopped-tag {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin-top: 6px;
  padding: 2px 8px;
  font-size: 11px;
  color: #fca5a5;
  background: rgba(239, 68, 68, .1);
  border: 1px solid rgba(239, 68, 68, .35);
  border-radius: 4px;
}
html[data-theme="light"] .msg-stopped-tag { color: #b91c1c; background: rgba(254, 242, 242, .8); border-color: #fca5a5; }
.stream-text {
  display: block;
  word-break: break-word;
}
.stream-text.streaming-plain,
.long-answer-plain {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.stream-text:empty { display: none; }
.stream-cursor {
  display: inline-block;
  width: 6px;
  height: 15px;
  background-color: var(--primary);
  animation: cursorBlink 1s step-end infinite;
  margin-left: 3px;
  vertical-align: middle;
}
@keyframes cursorBlink { 50% { opacity: 0; } }

/* ===== 思考过程(reasoning)折叠块 ===== */
.thinking-block {
  position: relative;
  margin: 2px 0 12px;
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  overflow: hidden;
  animation: thinkIn .35s var(--ease-out) both;
}
@keyframes thinkIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: none; }
}
.thinking-head {
  display: flex;
  align-items: center;
  gap: 7px;
  width: 100%;
  padding: 8px 12px;
  font-size: 12.5px;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  text-align: left;
  -webkit-user-select: none;
}
.thinking-head:hover { color: var(--text); }
.thinking-head .t-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 16px;
  height: 16px;
  color: var(--primary);
}
.thinking-head .t-icon svg { display: block; width: 15px; height: 15px; }
.thinking-head .t-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 500; }
.thinking-head .t-chevron {
  display: inline-flex;
  flex: none;
  color: var(--text-muted);
  transition: transform .25s var(--ease-out);
}
.thinking-head .t-chevron svg { display: block; width: 14px; height: 14px; }
.thinking-block.open .t-chevron { transform: rotate(180deg); }
/* 思考中:标题渐变流光 + 图标呼吸 */
.thinking-block.thinking .t-title {
  background: linear-gradient(90deg, var(--text-muted) 25%, var(--primary) 50%, var(--text-muted) 75%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: thinkShimmer 1.6s linear infinite;
}
@keyframes thinkShimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.thinking-block.thinking .t-icon { animation: thinkPulse 1.6s ease-in-out infinite; }
@keyframes thinkPulse {
  0%, 100% { opacity: .45; transform: scale(.9); }
  50%      { opacity: 1;   transform: scale(1.06); }
}
/* 展开区:grid 0fr→1fr 实现高度过渡 */
.thinking-body-wrap {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .32s cubic-bezier(.4, 0, .2, 1);
}
.thinking-block.open .thinking-body-wrap { grid-template-rows: 1fr; }
.thinking-body-clip { min-height: 0; overflow: hidden; }
/* 思考流式进行中:底部渐隐,暗示内容仍在追加 */
.thinking-block.thinking.open .thinking-body-clip {
  -webkit-mask-image: linear-gradient(180deg, #000 78%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 78%, transparent 100%);
}
.thinking-body {
  max-height: 320px;
  overflow-y: auto;
  padding: 0 14px 12px 35px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-muted);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.thinking-cursor {
  display: inline-block;
  width: 6px;
  height: 13px;
  margin-left: 2px;
  border-radius: 1px;
  background: var(--text-muted);
  vertical-align: middle;
  animation: cursorBlink 1s step-end infinite;
}
@media (max-width: 640px) {
  .thinking-body { padding: 0 12px 10px 34px; font-size: 12.5px; max-height: 260px; }
}
.stream-image {
  display: block;
  max-width: 100%;
  max-height: 480px;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin: 4px 0;
  background: var(--bg-soft);
}
.image-warning {
  display: block;
  margin: 4px 0 8px;
  padding: 8px 12px;
  font-size: 12.5px;
  color: #fbbf24;
  background: rgba(245, 158, 11, .1);
  border: 1px solid rgba(245, 158, 11, .35);
  border-radius: 8px;
  line-height: 1.5;
}

.output-limit-warning {
  display: block;
  margin: 12px 0 4px;
  padding: 8px 12px;
  font-size: 12.5px;
  color: #fbbf24;
  background: rgba(245, 158, 11, .1);
  border: 1px solid rgba(245, 158, 11, .35);
  border-radius: 8px;
  line-height: 1.5;
}
html[data-theme="light"] .image-warning,
html[data-theme="light"] .output-limit-warning { color: #92400e; background: rgba(254, 243, 199, .55); border-color: rgba(245, 158, 11, .45); }

.image-missing {
  display: inline-block;
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 13px;
}
.stream-image-prompt {
  margin-top: 8px;
  padding: 8px 12px;
  font-size: 12.5px;
  color: var(--text-secondary);
  background: var(--bg-soft);
  border-radius: 8px;
  line-height: 1.6;
}

/* ===== Input:悬浮命令条 ===== */
.input-area {
  flex-shrink: 0;
  width: 100%;
  max-width: 948px; /* 与消息列(900px)左右各 24px 对齐 */
  align-self: center;
  padding: 10px 24px 16px;
  background: transparent;
}
.input-box {
  max-width: 100%;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: border-color .18s var(--ease-out), box-shadow .18s var(--ease-out);
  padding: 5px;
  position: relative;
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, .12);
}
/* 顶部高光线(悬浮胶囊顶缘反光) */
.input-box::before {
  content: "";
  position: absolute;
  top: 0; left: 12%; right: 12%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .16), transparent);
  pointer-events: none;
}
/* 聚焦:1.5px 品牌渐变描边渐显(mask 镂空圆环) */
.input-box::after {
  content: "";
  position: absolute;
  inset: -1.5px;
  border-radius: inherit;
  padding: 1.5px;
  background: var(--grad-brand);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  opacity: 0;
  transition: opacity .18s var(--ease-out);
  pointer-events: none;
}
.input-box:focus-within { border-color: rgba(var(--glow), .55); box-shadow: var(--shadow), var(--glow-shadow); }
.input-box:focus-within::after { opacity: 1; }
.input-preview { display: flex; flex-wrap: wrap; gap: 8px; padding: 8px 8px 0; }
.preview-file {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 8px;
  background: var(--bg-hover);
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  font-size: 12.5px;
  max-width: 200px;
}
.preview-file img { width: 30px; height: 30px; border-radius: 5px; object-fit: cover; }
.preview-file .pf-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.preview-file .pf-badge {
  flex-shrink: 0;
  padding: 1px 6px;
  font-size: 10.5px;
  font-weight: 700;
  color: #fbbf24;
  background: rgba(245, 158, 11, .12);
  border: 1px solid rgba(245, 158, 11, .4);
  border-radius: 99px;
  white-space: nowrap;
}
html[data-theme="light"] .preview-file .pf-badge { color: #b45309; background: rgba(254, 243, 199, .7); }
.preview-file .pf-remove { cursor: pointer; color: var(--text-muted); display: flex; }
.preview-file .pf-remove:hover { color: #ef4444; }
.preview-file .pf-remove svg { width: 14px; height: 14px; }

/* ===== 聊天消息内的文档文件卡片 ===== */
.msg-file-card {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 14px 7px 7px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  max-width: 280px;
  transition: transform .15s var(--ease-out), box-shadow .15s var(--ease-out);
}
.msg-file-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg), var(--glow-shadow);
}
.mfc-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  font-size: 17px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .14);
}
.mfc-green  { background: linear-gradient(135deg, #10b981, #059669); }
.mfc-blue   { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
.mfc-red    { background: linear-gradient(135deg, #f43f5e, #be123c); }
.mfc-purple { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
.mfc-slate  { background: linear-gradient(135deg, #64748b, #475569); }
.mfc-info {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.mfc-name {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mfc-sub {
  font-size: 10.5px;
  color: var(--text-muted);
  white-space: nowrap;
}

.input-row { display: flex; align-items: flex-end; gap: 7px; padding: 7px; }
.input-tools { display: flex; gap: 2px; }
.tool-btn {
  width: 36px; height: 36px;
  border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  transition: all .15s var(--ease-out);
  flex-shrink: 0;
}
.tool-btn:hover { background: var(--bg-hover); color: var(--primary); }
.tool-btn svg { width: 19px; height: 19px; }
.tool-btn.active { color: var(--primary); background: rgba(var(--glow), .16); }
/* 生图模型分辨率切换（1K/2K）：紧凑分段控件，仅图片模型时显示 */
.img-size-toggle {
  display: flex; align-items: center; gap: 2px;
  padding: 3px; margin: 0 4px 2px 0;
  border-radius: 11px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  flex-shrink: 0;
  align-self: flex-end;
}
.img-size-btn {
  padding: 4px 9px;
  border-radius: 8px;
  font-size: 12px; font-weight: 700; line-height: 1.2;
  color: var(--text-muted);
  transition: all .15s var(--ease-out);
}
.img-size-btn:hover { color: var(--primary); }
.img-size-btn.active {
  color: var(--primary);
  background: rgba(var(--glow), .16);
  box-shadow: inset 0 0 0 1px rgba(var(--glow), .25);
}
#msgInput {
  flex: 1;
  resize: none;
  border: none;
  background: transparent;
  font-size: 15px;
  line-height: 1.5;
  max-height: 160px;
  padding: 8px 4px;
  color: var(--text);
}
#msgInput::placeholder { color: var(--text-muted); }
.send-btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--grad-brand);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--glow-shadow);
  transition: transform .15s var(--ease-out), box-shadow .2s var(--ease-out), background .2s var(--ease-out);
}
/* 可发送态:辉光呼吸 */
.send-btn:not(:disabled) { animation: sendGlow 2.8s ease-in-out infinite; }
@keyframes sendGlow {
  0%, 100% { box-shadow: 0 0 22px rgba(var(--glow), .25); }
  50%      { box-shadow: 0 0 48px rgba(var(--glow), .5); }
}
.send-btn:hover { transform: translateY(-2px); box-shadow: 0 0 54px rgba(var(--glow), .45); }
.send-btn:disabled { background: var(--bg-hover); color: var(--text-muted); box-shadow: none; animation: none; }
.send-btn svg { width: 18px; height: 18px; }
.send-btn .send-icon,
.send-btn .stop-icon { display: block; width: 18px; height: 18px; }
/* 流式响应中的「停止」圆形按钮 */
.send-btn.is-streaming {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ef4444, #dc2626) !important;
  color: #fff !important;
  box-shadow: 0 4px 14px rgba(239, 68, 68, .35);
  animation: stopPulse 1.6s ease-in-out infinite;
}
.send-btn.is-streaming:hover { background: linear-gradient(135deg, #dc2626, #b91c1c) !important; }
.send-btn.is-streaming svg { width: 18px; height: 18px; }
@keyframes stopPulse {
  0%, 100% { box-shadow: 0 4px 14px rgba(239, 68, 68, .35); }
  50%      { box-shadow: 0 4px 22px rgba(239, 68, 68, .55); }
}
.input-hint { text-align: center; font-size: 11.5px; color: var(--text-muted); margin-top: 9px; }
.input-counter {
  display: inline-block;
  font-variant-numeric: tabular-nums;
  transition: color .15s var(--ease-out);
}
.input-counter.warn { color: #f59e0b; font-weight: 600; }
.input-counter.over { color: #ef4444; font-weight: 700; }

/* overlay for mobile */
.overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(2, 6, 23, .55);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 170;
}
.overlay.show { display: block; }

/* toast:玻璃卡片 + 类型图标 + 倒计时进度条 */
.toast {
  position: fixed;
  top: 20px; left: 50%;
  transform: translateX(-50%) translateY(-90px);
  display: flex; align-items: center; gap: 10px;
  max-width: min(520px, calc(100vw - 32px));
  padding: 11px 16px;
  border-radius: 14px;
  background: var(--surface-raised);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--text);
  font-size: 13px; font-weight: 600; line-height: 1.55;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, .14);
  z-index: 300;
  opacity: 0; pointer-events: none;
  transition: transform .34s cubic-bezier(.34, 1.35, .4, 1), opacity .28s ease;
  overflow: hidden;
  white-space: normal;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.toast-icon {
  width: 26px; height: 26px; flex: 0 0 auto;
  display: grid; place-items: center; border-radius: 8px;
  color: #fff; background: linear-gradient(135deg, #38bdf8, #6366f1);
  box-shadow: 0 3px 9px rgba(56, 189, 248, .35);
}
.toast-icon svg { width: 15px; height: 15px; }
.toast-success .toast-icon { background: linear-gradient(135deg, #34d399, #059669); box-shadow: 0 3px 9px rgba(16, 185, 129, .35); }
.toast-warning .toast-icon { background: linear-gradient(135deg, #fbbf24, #d97706); box-shadow: 0 3px 9px rgba(217, 119, 6, .35); }
.toast-text { word-break: break-word; min-width: 0; }
.toast-bar {
  position: absolute; left: 0; right: 0; bottom: 0; height: 2.5px;
  border-radius: 0 2px 2px 0;
  background: linear-gradient(90deg, #38bdf8, #6366f1);
  transform-origin: left;
  animation: toastBar linear forwards;
}
.toast-success .toast-bar { background: linear-gradient(90deg, #34d399, #059669); }
.toast-warning .toast-bar { background: linear-gradient(90deg, #fbbf24, #d97706); }
@keyframes toastBar { from { transform: scaleX(1); } to { transform: scaleX(0); } }

/* ===== Responsive:移动端侧栏回退 fixed 抽屉 ===== */
@media (max-width: 768px) {
  .app { grid-template-columns: minmax(0, 1fr); }
  /* 单列网格下 .main 回到第 1 列(桌面端的 grid-column:2 会产生隐式第二列) */
  .main { grid-column: 1; }
  .sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: min(84vw, 330px);
    height: auto;
    margin: 10px;
    border-radius: 20px;
    background: var(--surface-raised);
    transform: translateX(calc(-100% - 24px));
    overflow-y: auto;
    overflow-x: hidden;
    overscroll-behavior: contain;
    z-index: 180;
  }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: flex; flex: 0 0 38px; }
  .main-header {
    height: 62px;
    margin: 10px 10px 0;
    padding: 0 8px;
    gap: 8px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(136px, 1.45fr) 40px;
    align-items: center;
  }
  .header-side { min-width: 0; gap: 7px; }
  .theme-toggle { width: 38px; height: 38px; border: 1px solid var(--border); background: var(--surface-raised); box-shadow: 0 5px 14px rgba(var(--glow), .1); }
  .theme-toggle-track { width: 36px; height: 36px; border: 0; background: transparent; box-shadow: none; }
  .theme-toggle-thumb { display: none; }
  .theme-icon { top: 11px; left: 11px; right: auto; width: 16px; height: 16px; }
  .theme-icon.sun { left: 11px; opacity: 0; }
  .theme-icon.moon { right: auto; left: 11px; color: var(--primary); opacity: 1; }
  html[data-theme="light"] .theme-icon.sun { opacity: 1; }
  html[data-theme="light"] .theme-icon.moon { opacity: 0; }
  .chat-title { display: block; min-width: 0; font-size: 12.5px; font-weight: 800; color: var(--text); }
  .model-picker { min-width: 0; width: 100%; }
  .model-select { width: 100%; max-width: none; min-width: 0; height: 44px; padding: 5px 8px 5px 5px; gap: 7px; border-radius: 14px; }
  .ms-info { display: flex; flex-direction: row; align-items: baseline; gap: 5px; }
  .ms-price { display: none; }
  .ms-name { max-width: none; width: 100%; font-size: 12.5px; }
  .ms-icon { width: 26px; height: 26px; border-radius: 8px; }
  .ms-icon svg { width: 15px; height: 15px; }
  .ms-arrow { width: 14px; height: 14px; }
  .model-dropdown { min-width: 280px; }
  /* 欢迎页:单列,顶部对齐 */
  .welcome { min-height: 100%; justify-content: flex-start; padding: 26px 16px 20px; }
  .welcome-logo { width: 64px; height: 64px; border-radius: 20px; margin-bottom: 16px; }
  .wl-ring { inset: -8px; border-radius: 26px; }
  .wl-ring::before { inset: -7px; }
  .welcome-badges { margin-bottom: 14px; }
  .wb-chip { padding: 5px 10px; font-size: 11px; }
  .welcome-title { font-size: clamp(27px, 7.4vw, 34px); }
  .welcome-desc { margin: 12px 0 22px; font-size: 13.5px; }
  .suggest-cards { grid-template-columns: 1fr; gap: 10px; }
  .suggest-card { min-height: 78px; padding: 14px 14px 14px 12px; gap: 12px; }
  .sc-num { font-size: 30px; top: 2px; right: 10px; }
  .sc-icon { flex-basis: 40px; width: 40px; height: 40px; border-radius: 12px; }
  .sc-icon svg { width: 18px; height: 18px; }
  .sc-desc { white-space: normal; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
  .sc-go { display: none; }
  .messages { max-width: none; padding: 16px 0 6px; }
  .msg { padding: 10px 12px; gap: 10px; }
  .msg-avatar { width: 34px; height: 34px; }
  .msg-content { width: calc(100% - 44px); min-width: 0; }
  .msg-bubble { width: 100%; font-size: 14px; overflow-wrap: anywhere; }
  .msg.user .msg-bubble-wrap { max-width: 100%; }
  .input-area { max-width: none; padding: 9px 10px 12px; }
  .input-box { border-radius: 16px; }
  .input-row { gap: 3px; padding: 5px; }
  .input-tools { gap: 0; }
  .tool-btn { width: 34px; height: 36px; }
  .img-size-toggle { margin-right: 2px; }
  .img-size-btn { padding: 4px 7px; font-size: 11px; }
  #msgInput { min-width: 0; font-size: 14px; padding-inline: 3px; }
  .input-hint { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 9.5px; }
  .sidebar-footer { padding-bottom: 10px; }
}

@media (max-width: 390px) {
  .main-header { grid-template-columns: minmax(82px, 1fr) minmax(124px, 1.35fr) 36px; padding-inline: 6px; gap: 5px; }
  .menu-toggle { width: 34px; height: 36px; flex-basis: 34px; }
  .chat-title { font-size: 12px; }
  .theme-toggle { width: 36px; }
  .theme-toggle-track { width: 34px; }
  .theme-icon, .theme-icon.sun, .theme-icon.moon { left: 10px; }
  .ms-name { font-size: 12px; }
  .welcome { padding-inline: 12px; }
  .suggest-card { padding-inline: 12px; }
  .tool-btn { width: 31px; }
}

/* ===== SEO 工具样式 ===== */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.seo-footer {
  padding: 18px 24px;
  background: var(--surface);
  border-top: 1px solid var(--border-soft);
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.7;
  text-align: center;
}
.seo-footer a { color: var(--primary); text-decoration: none; margin: 0 6px; }
.seo-footer a:hover { text-decoration: underline; }
.seo-footer .seo-tags { margin-top: 6px; font-size: 12px; color: var(--text-muted); }

/* ===== 动效无障碍:常驻动画全部停用 ===== */
@media (prefers-reduced-motion: reduce) {
  .sk-line::before,
  .stream-cursor,
  .thinking-cursor,
  .thinking-block,
  .thinking-block.thinking .t-title,
  .thinking-block.thinking .t-icon,
  .model-dropdown,
  .send-btn:not(:disabled),
  .send-btn.is-streaming { animation: none !important; }
  .new-chat-btn::after { transition: none !important; }
}