/* webimage · OpenAI 风格 UI（零框架、无构建） */
:root {
  --bg: #ffffff;
  --bg-2: #f7f7f8;
  --bg-3: #ececf1;
  --fg: #0d0d0d;
  --fg-2: #5d5d69;
  --fg-3: #8e8ea0;
  --line: #e3e3e8;
  --accent: #0d0d0d;
  --accent-fg: #ffffff;
  --hover: #f0f0f3;
  --bubble-user: #f4f4f5;
  --danger: #d92d20;
  --ok: #12924f;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, .08);
  --shadow-pop: 0 12px 40px rgba(0, 0, 0, .14), 0 2px 8px rgba(0, 0, 0, .06);
  --sb-w: 268px;
  /* 弹簧曲线：带一点回弹，收尾干脆 */
  --spring: cubic-bezier(.34, 1.56, .64, 1);
  --spring-soft: cubic-bezier(.22, 1.2, .36, 1);
  --ease: cubic-bezier(.22, 1, .36, 1);
  color-scheme: light;
}
[data-theme="dark"] {
  --bg: #212121;
  --bg-2: #171717;
  --bg-3: #2f2f2f;
  --fg: #ececf1;
  --fg-2: #b8b8c4;
  --fg-3: #8e8ea0;
  --line: #3a3a3a;
  --accent: #ffffff;
  --accent-fg: #0d0d0d;
  --hover: #2a2a2a;
  --bubble-user: #2f2f2f;
  --shadow: 0 8px 30px rgba(0, 0, 0, .35);
  --shadow-pop: 0 16px 44px rgba(0, 0, 0, .5), 0 2px 10px rgba(0, 0, 0, .3);
  color-scheme: dark;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.6 "Segoe UI", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; }
svg { display: block; }
a { color: inherit; }

.app { display: flex; height: 100dvh; overflow: hidden; }

/* ================= 自定义下拉（二级菜单） ================= */
.dd { position: relative; display: inline-flex; align-items: center; min-width: 0; }
/* 原生 select 只作为数据源与无障碍语义，视觉完全隐藏 */
.dd-native {
  position: absolute !important;
  width: 1px; height: 1px; opacity: 0; pointer-events: none;
  clip-path: inset(50%); margin: -1px; overflow: hidden;
}
.dd-btn {
  display: inline-flex; align-items: center; gap: 4px;
  min-width: 0; padding: 2px 3px 2px 1px;
  border: 0; border-radius: 7px; background: none;
  font-size: 12px; color: var(--fg); cursor: pointer;
  transition: background .16s var(--ease), color .16s var(--ease);
}
.dd-btn:hover { background: var(--hover); }
.dd-btn:focus-visible { outline: 2px solid var(--fg-3); outline-offset: 1px; }
.dd-label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.dd-caret {
  flex: 0 0 auto; opacity: .55;
  transition: transform .3s var(--spring), opacity .16s;
}
.dd.open .dd-caret { transform: rotate(180deg); opacity: .9; }

/* 顶栏模型选择：带边框的盒子样式 */
.dd--boxed {
  max-width: 200px; padding: 0 2px 0 9px;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--bg-2);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}
.dd--boxed:hover { border-color: var(--fg-3); }
.dd--boxed.open { border-color: var(--fg-3); }
.dd--boxed .dd-btn { padding: 6px 3px; font-size: 13px; }
.dd--boxed .dd-btn:hover { background: none; }

/* 浮层面板 */
.dd-pop {
  position: fixed; z-index: 120;
  min-width: 128px; max-height: 302px;
  padding: 5px; overflow-y: auto; overscroll-behavior: contain;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-pop);
  opacity: 0; pointer-events: none;
  transform: translateY(7px) scale(.95);
  transform-origin: top center;
  transition: opacity .15s var(--ease), transform .26s var(--spring);
  will-change: transform, opacity;
}
.dd-pop[data-up="1"] { transform: translateY(-7px) scale(.95); transform-origin: bottom center; }
.dd-pop.open { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.dd-pop::-webkit-scrollbar { width: 6px; }
.dd-pop::-webkit-scrollbar-thumb { background: var(--line); border-radius: 3px; }

.dd-opt {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  width: 100%; padding: 7px 9px; border-radius: 9px;
  font-size: 13px; color: var(--fg-2); text-align: left;
  transition: background .13s var(--ease), color .13s var(--ease);
}
.dd-opt span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dd-opt svg { flex: 0 0 auto; color: var(--fg); }
.dd-opt:hover, .dd-opt.hl { background: var(--hover); color: var(--fg); }
.dd-opt.on { color: var(--fg); font-weight: 600; }
.dd-pop.open .dd-opt { animation: ddOptIn .28s var(--spring) backwards; animation-delay: calc(var(--i, 0) * 16ms); }
@keyframes ddOptIn {
  from { opacity: 0; transform: translateY(-4px) scale(.97); }
  to { opacity: 1; transform: none; }
}

/* ================= 侧栏 ================= */
.sidebar {
  width: var(--sb-w);
  flex: 0 0 var(--sb-w);
  background: var(--bg-2);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  padding: 10px;
  gap: 8px;
  transition: transform .3s var(--ease);
  z-index: 40;
}
.sb-head { display: flex; align-items: center; justify-content: space-between; padding: 2px 4px; }
.brand {
  display: flex; align-items: center; gap: 8px;
  font-weight: 650; font-size: 15px; letter-spacing: .2px;
  padding: 6px 6px; border-radius: 10px;
  transition: background .16s var(--ease);
}
.brand:hover { background: var(--hover); }
.new-chat {
  display: flex; align-items: center; gap: 8px;
  width: 100%; padding: 9px 12px;
  border: 1px solid var(--line); border-radius: 11px;
  background: var(--bg); font-size: 14px; font-weight: 550;
  transition: background .16s var(--ease), border-color .16s var(--ease), transform .16s var(--spring);
}
.new-chat:hover { background: var(--hover); }
.new-chat:active { transform: scale(.98); }
.sb-scroll { flex: 1; overflow-y: auto; overscroll-behavior: contain; margin: 0 -2px; padding: 2px; }
.sb-scroll::-webkit-scrollbar { width: 6px; }
.sb-scroll::-webkit-scrollbar-thumb { background: var(--line); border-radius: 3px; }
.sb-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; border-radius: 9px;
  font-size: 13.5px; color: var(--fg-2);
  cursor: pointer; white-space: nowrap; overflow: hidden;
  transition: background .15s var(--ease), color .15s var(--ease);
  animation: sbItemIn .34s var(--spring) backwards;
}
@keyframes sbItemIn { from { opacity: 0; transform: translateX(-8px); } to { opacity: 1; transform: none; } }
.sb-item span { overflow: hidden; text-overflow: ellipsis; }
.sb-item:hover { background: var(--hover); color: var(--fg); }
.sb-item.active { background: var(--bg-3); color: var(--fg); font-weight: 550; }
.sb-item .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--fg-3); flex: 0 0 auto; }
.sb-item.active .dot { background: var(--fg); }
.sb-empty { color: var(--fg-3); font-size: 13px; padding: 14px 10px; text-align: center; line-height: 1.7; }
.sb-hint { font-size: 11.5px; opacity: .7; }
.sb-item .cnt {
  margin-left: auto; font-style: normal; font-size: 10.5px;
  color: var(--fg-3); background: var(--bg-3);
  min-width: 16px; height: 16px; border-radius: 8px;
  display: grid; place-items: center; padding: 0 4px; flex: 0 0 auto;
}
.sb-item.active .cnt { background: var(--line); color: var(--fg-2); }
.sb-foot { border-top: 1px solid var(--line); padding-top: 8px; }
.sb-row {
  display: flex; align-items: center; gap: 9px; width: 100%;
  padding: 8px 10px; border-radius: 9px; font-size: 13.5px; color: var(--fg-2);
  transition: background .15s var(--ease), color .15s var(--ease);
}
.sb-row:hover { background: var(--hover); color: var(--fg); }
.sb-meta { font-size: 11.5px; color: var(--fg-3); padding: 6px 10px 2px; line-height: 1.5; }
.scrim { display: none; }

/* ================= 主区 ================= */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; position: relative; }
.topbar {
  height: 52px; flex: 0 0 52px;
  display: flex; align-items: center; gap: 10px;
  padding: 0 14px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  z-index: 5;
}
.tb-title { font-size: 14.5px; font-weight: 600; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tb-right { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 9px; color: var(--fg-2);
  flex: 0 0 auto;
  transition: background .16s var(--ease), color .16s var(--ease), transform .16s var(--spring);
}
.icon-btn:hover { background: var(--hover); color: var(--fg); }
.icon-btn:active { transform: scale(.92); }

.scroll { flex: 1; overflow-y: auto; overscroll-behavior: contain; scroll-behavior: smooth; }
.scroll::-webkit-scrollbar { width: 8px; }
.scroll::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }
.thread { max-width: 790px; margin: 0 auto; padding: 22px 16px 8px; display: flex; flex-direction: column; gap: 20px; }

/* 空状态 */
.hero { margin: 8vh auto 0; text-align: center; max-width: 560px; padding: 0 8px; animation: heroIn .5s var(--spring) both; }
@keyframes heroIn { from { opacity: 0; transform: translateY(12px) scale(.98); } to { opacity: 1; transform: none; } }
.hero h1 { font-size: 27px; font-weight: 650; margin: 0 0 8px; letter-spacing: -.3px; }
.hero p { color: var(--fg-2); font-size: 14.5px; margin: 0 0 22px; }
.hero-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px; }
.hero-card {
  text-align: left; padding: 12px 13px; border: 1px solid var(--line);
  border-radius: 12px; background: var(--bg-2); font-size: 13px; color: var(--fg-2);
  transition: border-color .18s var(--ease), background .18s var(--ease), transform .22s var(--spring), box-shadow .22s var(--ease);
  animation: heroIn .5s var(--spring) backwards;
}
.hero-card:nth-child(1) { animation-delay: .05s; }
.hero-card:nth-child(2) { animation-delay: .1s; }
.hero-card:nth-child(3) { animation-delay: .15s; }
.hero-card:nth-child(4) { animation-delay: .2s; }
.hero-card:hover { border-color: var(--fg-3); background: var(--hover); transform: translateY(-2px); box-shadow: var(--shadow); }
.hero-card:active { transform: translateY(0) scale(.985); }
.hero-card b { display: block; color: var(--fg); font-size: 13.5px; font-weight: 600; margin-bottom: 2px; }

/* ================= 消息（q 弹出现） ================= */
.msg { display: flex; flex-direction: column; gap: 8px; animation: msgPop .48s var(--spring) both; }
.msg.instant { animation: none; }
@keyframes msgPop {
  0%   { opacity: 0; transform: translateY(14px) scale(.955); }
  62%  { opacity: 1; transform: translateY(-3px) scale(1.012); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}
.msg.user { align-items: flex-end; }
.bubble-user {
  max-width: 82%; background: var(--bubble-user); color: var(--fg);
  padding: 10px 14px; border-radius: 16px; border-bottom-right-radius: 6px;
  white-space: pre-wrap; word-break: break-word; font-size: 14.5px;
  transition: background .18s var(--ease);
}
.bubble-user img, .ref-thumb { max-width: 160px; border-radius: 9px; display: block; margin-top: 6px; }
.msg.assistant { align-items: flex-start; }
.ai-meta { display: flex; align-items: center; gap: 7px; font-size: 12px; color: var(--fg-3); }
.ai-badge {
  width: 20px; height: 20px; border-radius: 6px; background: var(--fg); color: var(--bg);
  display: grid; place-items: center; font-size: 10.5px; font-weight: 700; flex: 0 0 auto;
}
.img-grid { display: grid; gap: 8px; width: 100%; max-width: 100%; }
.img-grid.c1 { grid-template-columns: 1fr; max-width: 470px; }
.img-grid.c2 { grid-template-columns: repeat(2, 1fr); }
.img-grid.c3, .img-grid.c4 { grid-template-columns: repeat(2, 1fr); }
.thumb {
  position: relative; border-radius: 12px; overflow: hidden;
  background: var(--bg-2); border: 1px solid var(--line);
  aspect-ratio: 1; cursor: zoom-in; display: block; width: 100%;
  animation: thumbIn .55s var(--spring) backwards;
  transition: border-color .2s var(--ease), transform .24s var(--spring);
}
.img-grid .thumb:nth-child(1) { animation-delay: .06s; }
.img-grid .thumb:nth-child(2) { animation-delay: .13s; }
.img-grid .thumb:nth-child(3) { animation-delay: .2s; }
.img-grid .thumb:nth-child(4) { animation-delay: .27s; }
@keyframes thumbIn {
  0% { opacity: 0; transform: scale(.9) translateY(10px); }
  60% { opacity: 1; transform: scale(1.015) translateY(-2px); }
  100% { opacity: 1; transform: none; }
}
.thumb:hover { border-color: var(--fg-3); }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .45s var(--ease); }
.thumb:hover img { transform: scale(1.03); }
.thumb .badge {
  position: absolute; right: 7px; top: 7px; padding: 3px 7px; border-radius: 7px;
  background: rgba(0,0,0,.62); color: #fff; font-size: 11px; backdrop-filter: blur(4px);
  opacity: 0; transform: translateY(-3px);
  transition: opacity .18s var(--ease), transform .22s var(--spring);
}
.thumb:hover .badge { opacity: 1; transform: none; }
.thumb.expired { cursor: default; display: grid; place-items: center; background: var(--bg-3); }
.thumb.expired:hover img { transform: none; }
.exp-tip { color: var(--fg-3); font-size: 12px; text-align: center; line-height: 1.7; padding: 10px; }
.no-img-tip {
  grid-column: 1 / -1;
  border: 1px dashed var(--line); border-radius: 12px;
  background: var(--bg-2); color: var(--fg-3);
  font-size: 12.5px; padding: 16px 14px; text-align: center;
}
.hist-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px; padding: 60px 20px; text-align: center;
  animation: msgPop .42s var(--spring) both;
}
.hist-empty b { font-size: 15px; color: var(--fg); font-weight: 600; }
.hist-empty span { font-size: 12.5px; color: var(--fg-3); line-height: 1.7; }
.img-acts { display: flex; gap: 6px; flex-wrap: wrap; animation: msgPop .4s var(--spring) .12s backwards; }
.mini-btn {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 10px; border-radius: 8px; border: 1px solid var(--line);
  font-size: 12px; color: var(--fg-2); background: var(--bg-2);
  transition: background .15s var(--ease), color .15s var(--ease), border-color .15s var(--ease), transform .15s var(--spring);
}
.mini-btn:hover { background: var(--hover); color: var(--fg); border-color: var(--fg-3); }
.mini-btn:active { transform: scale(.95); }
.err-box {
  border: 1px solid var(--line); border-left: 3px solid var(--danger);
  background: var(--bg-2); color: var(--fg-2);
  padding: 10px 13px; border-radius: 10px; font-size: 13.5px; max-width: 100%;
  word-break: break-word;
  animation: msgPop .42s var(--spring) both;
}

/* 生成中骨架 */
.skel-grid { display: grid; gap: 8px; width: 100%; max-width: 470px; }
.skel {
  aspect-ratio: 1; border-radius: 12px; border: 1px solid var(--line);
  background: linear-gradient(100deg, var(--bg-2) 20%, var(--bg-3) 40%, var(--bg-2) 60%);
  background-size: 220% 100%; animation: shimmer 1.4s infinite linear, skelIn .45s var(--spring) both;
}
@keyframes skelIn { from { opacity: 0; transform: scale(.94); } to { opacity: 1; transform: none; } }
@keyframes shimmer { from { background-position: 120% 0; } to { background-position: -20% 0; } }
.thinking { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--fg-3); }
.spin { width: 14px; height: 14px; border: 2px solid var(--line); border-top-color: var(--fg-2); border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ================= 输入区 ================= */
.composer-wrap { flex: 0 0 auto; padding: 6px 16px 10px; background: linear-gradient(to top, var(--bg) 62%, transparent); }
.composer {
  max-width: 790px; margin: 0 auto;
  border: 1px solid var(--line); border-radius: 18px;
  background: var(--bg-2); padding: 10px 12px 8px;
  transition: border-color .18s var(--ease), box-shadow .24s var(--ease);
}
.composer:focus-within { border-color: var(--fg-3); box-shadow: var(--shadow); }
.cp-row { display: flex; align-items: flex-end; gap: 8px; }
#prompt {
  flex: 1; resize: none; border: 0; outline: none; background: transparent;
  font-size: 15px; line-height: 1.5; max-height: 168px; min-height: 26px;
  padding: 4px 2px; color: var(--fg);
}
#prompt::placeholder { color: var(--fg-3); }
.send {
  width: 34px; height: 34px; border-radius: 50%; flex: 0 0 auto;
  background: var(--accent); color: var(--accent-fg);
  display: grid; place-items: center;
  transition: opacity .18s var(--ease), transform .22s var(--spring), background .18s var(--ease);
}
.send:disabled { opacity: .35; cursor: not-allowed; }
.send:active:not(:disabled) { transform: scale(.9); }
.send:not(:disabled):hover { transform: scale(1.06); }
.cp-tools { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 7px; align-items: center; }
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 9px; border-radius: 9px; border: 1px solid var(--line);
  background: var(--bg); font-size: 12px; color: var(--fg-2);
  transition: border-color .16s var(--ease), color .16s var(--ease), background .16s var(--ease), transform .16s var(--spring);
}
.chip:hover { border-color: var(--fg-3); color: var(--fg); }
.chip:active { transform: scale(.97); }
.chip:focus-within { border-color: var(--fg-3); }
.chip.sel { padding: 2px 3px 2px 9px; gap: 2px; }
.chip-label { color: var(--fg-3); font-size: 11.5px; white-space: nowrap; }
.chip.sel .dd-btn { font-size: 12px; padding: 2px 2px 2px 1px; }
.attach-bar { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }
.attach-item {
  position: relative; width: 54px; height: 54px; border-radius: 9px;
  overflow: hidden; border: 1px solid var(--line);
  animation: thumbIn .4s var(--spring) both;
}
.attach-item img { width: 100%; height: 100%; object-fit: cover; }
.attach-item button {
  position: absolute; top: 1px; right: 1px; width: 17px; height: 17px; border-radius: 50%;
  background: rgba(0,0,0,.68); color: #fff; font-size: 11px; line-height: 1; display: grid; place-items: center;
  transition: transform .16s var(--spring), background .16s;
}
.attach-item button:hover { background: rgba(0,0,0,.85); transform: scale(1.12); }
.disclaimer { text-align: center; font-size: 11px; color: var(--fg-3); margin: 6px 0 0; }

/* ================= 查看器 ================= */
.viewer {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(8, 8, 9, .985);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  display: flex; flex-direction: column;
  animation: fadeIn .2s var(--ease);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.vw-top { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; color: #ddd; animation: slideDown .34s var(--spring) both; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: none; } }
.vw-info { font-size: 12.5px; opacity: .75; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.vw-acts { display: flex; gap: 4px; }
.viewer .icon-btn { color: #ddd; }
.viewer .icon-btn:hover { background: rgba(255,255,255,.14); color: #fff; }
.vw-stage { flex: 1; display: grid; place-items: center; overflow: hidden; padding: 4px 10px; }
.vw-stage img { max-width: 100%; max-height: 100%; object-fit: contain; border-radius: 4px; animation: vwZoom .34s var(--spring) both; }
@keyframes vwZoom { from { opacity: 0; transform: scale(.9); } to { opacity: 1; transform: none; } }
.vw-nav { display: flex; align-items: center; justify-content: center; gap: 18px; padding: 10px; color: #ddd; font-size: 13px; animation: slideUp .34s var(--spring) both; }
@keyframes slideUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ================= 弹窗 / toast ================= */
.modal {
  position: fixed; inset: 0; z-index: 110;
  background: rgba(0,0,0,.5);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  display: grid; place-items: center; padding: 18px;
  animation: fadeIn .18s var(--ease);
}
.modal-card {
  width: 100%; max-width: 400px;
  background: var(--bg); border-radius: 16px; padding: 20px;
  box-shadow: var(--shadow-pop); border: 1px solid var(--line);
  animation: modalPop .38s var(--spring) both;
}
@keyframes modalPop {
  0% { opacity: 0; transform: translateY(16px) scale(.94); }
  62% { opacity: 1; transform: translateY(-3px) scale(1.012); }
  100% { opacity: 1; transform: none; }
}
.modal-card h3 { margin: 0 0 6px; font-size: 16px; }
.modal-card p { margin: 0 0 14px; font-size: 13px; color: var(--fg-2); line-height: 1.6; word-break: break-word; }
.modal-card input {
  width: 100%; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg-2); outline: none; font-size: 14px; margin-bottom: 12px;
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.modal-card input:focus { border-color: var(--fg-3); box-shadow: 0 0 0 3px rgba(142,142,160,.16); }
.btn-primary {
  width: 100%; padding: 10px; border-radius: 10px; background: var(--accent);
  color: var(--accent-fg); font-size: 14px; font-weight: 600;
  transition: transform .16s var(--spring), opacity .16s var(--ease);
}
.btn-primary:hover { opacity: .9; }
.btn-primary:active { transform: scale(.975); }
.btn-ghost {
  flex: 1; padding: 10px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg-2);
  color: var(--fg-2); font-size: 14px; font-weight: 500;
  transition: background .16s var(--ease), color .16s var(--ease), transform .16s var(--spring);
}
.btn-ghost:hover { background: var(--hover); color: var(--fg); }
.btn-ghost:active { transform: scale(.975); }
.modal-acts { display: flex; gap: 8px; }
.modal-acts .btn-primary { flex: 1; width: auto; }
.modal-card dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; font-size: 13px; margin: 0; }
.modal-card dt { color: var(--fg-3); }
.modal-card dd { margin: 0; color: var(--fg); font-variant-numeric: tabular-nums; text-align: right; }

.toast {
  position: fixed; left: 50%; bottom: 26px;
  transform: translate(-50%, 16px) scale(.94);
  background: var(--accent); color: var(--accent-fg);
  padding: 8px 15px; border-radius: 11px; font-size: 13px;
  box-shadow: var(--shadow-pop);
  opacity: 0; pointer-events: none; z-index: 200;
  max-width: 86vw; text-align: center;
  transition: opacity .2s var(--ease), transform .38s var(--spring);
}
.toast.show { opacity: 1; transform: translate(-50%, 0) scale(1); }

.only-mobile { display: none; }

/* ================= 响应式 ================= */
@media (max-width: 860px) {
  .only-mobile { display: inline-flex; }
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0;
    transform: translateX(-100%);
    box-shadow: 0 0 40px rgba(0,0,0,.3);
    width: min(80vw, 300px); flex-basis: auto;
  }
  .sidebar.open { transform: none; }
  .scrim.show { display: block; position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 30; animation: fadeIn .2s var(--ease); }
  .thread { padding: 16px 12px 4px; gap: 16px; }
  .topbar { height: 50px; flex-basis: 50px; padding: 0 8px; }
  .dd--boxed { max-width: 138px; }
  .dd--boxed .dd-btn { font-size: 12px; }
  .hero { margin-top: 5vh; }
  .hero h1 { font-size: 22px; }
  .hero p { font-size: 13.5px; }
  .hero-grid { grid-template-columns: 1fr 1fr; gap: 7px; }
  .hero-card { padding: 10px; font-size: 12px; }
  .composer-wrap { padding: 4px 8px calc(6px + env(safe-area-inset-bottom)); }
  .composer { border-radius: 16px; padding: 8px 10px 6px; }
  #prompt { font-size: 16px; } /* 防 iOS 缩放 */
  .bubble-user { max-width: 88%; font-size: 14px; }
  .img-grid.c1 { max-width: 100%; }
  .cp-tools { gap: 5px; }
  .chip { font-size: 11.5px; padding: 3px 8px; }
  .chip.sel { padding: 2px 3px 2px 8px; }
  .chip.sel .dd-btn { font-size: 11.5px; }
  .chip-label { font-size: 11px; }
  .disclaimer { font-size: 10px; }
  .sb-item { font-size: 14px; padding: 10px; }
  .dd-pop { max-height: 46vh; }
}
@media (max-width: 380px) {
  .hero-grid { grid-template-columns: 1fr; }
  .chip.sel .chip-label { display: none; }
  .chip.sel { padding-left: 5px; }
}
/* 触屏设备没有 hover，让角标常驻 */
@media (hover: none) {
  .thumb .badge { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}