:root {
  --bg: oklch(16% 0.02 280);
  --bg-soft: oklch(22% 0.03 280);
  --bg-panel: oklch(19% 0.025 280);
  --text: oklch(95% 0.01 280);
  --muted: oklch(68% 0.02 280);
  --accent: oklch(72% 0.18 50);
  --line: oklch(32% 0.03 280);
  --ok: oklch(72% 0.16 150);
  --err: oklch(70% 0.18 25);
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}
.hidden { display: none !important; }
button { font-family: inherit; }

/* ---- 三栏布局 ---- */
.app {
  display: grid;
  grid-template-columns: 240px 1fr 320px;
  height: 100vh;
  overflow: hidden;
}

/* ---- 左侧栏 ---- */
.sidebar {
  background: var(--bg-soft); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; padding: 1rem 0.85rem; gap: 0.9rem;
  min-width: 0;
}
.brand .mark {
  font-size: 1.6rem; font-weight: 800; letter-spacing: 0.05em;
  background: linear-gradient(120deg, var(--accent), oklch(85% 0.12 320));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.new-btn {
  background: var(--accent); color: oklch(20% 0.02 50); border: none;
  border-radius: 999px; padding: 0.6rem 1rem; font-weight: 700; cursor: pointer;
  transition: transform 150ms cubic-bezier(0.16,1,0.3,1);
}
.new-btn:hover { transform: translateY(-1px); }
.nav { display: flex; flex-direction: column; gap: 0.25rem; }
.nav-item {
  background: transparent; border: none; color: var(--muted);
  text-align: left; padding: 0.55rem 0.7rem; border-radius: 8px;
  font-size: 0.95rem; cursor: pointer; transition: background 150ms, color 150ms;
}
.nav-item:hover { color: var(--text); background: var(--bg-panel); }
.nav-item.active { color: var(--text); background: var(--bg-panel); font-weight: 600; }
.hist { flex: 1; min-height: 0; overflow-y: auto; }
.hist h2 {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--muted); margin: 0.5rem 0.2rem;
}
.hist ul { list-style: none; margin: 0; padding: 0; }
.hist li {
  padding: 0.55rem 0.65rem; border-radius: 8px; cursor: pointer;
  color: var(--text); font-size: 0.9rem; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis; transition: background 150ms;
}
.hist li:hover { background: var(--bg-panel); }
.hist li.active { background: var(--bg-panel); border-left: 2px solid var(--accent); }
.hist li .st { display: block; font-size: 0.72rem; color: var(--muted); margin-top: 0.15rem; }

/* ---- 中栏 ---- */
.main { display: flex; flex-direction: column; min-width: 0; background: var(--bg); }
.topbar {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.85rem 1.2rem; border-bottom: 1px solid var(--line);
}
.topbar-title { font-weight: 600; }
.account { margin-left: auto; display: inline-flex; align-items: center; gap: 0.6rem; font-size: 0.85rem; color: var(--muted); }
.account .credits { padding: 0.15rem 0.55rem; border-radius: 999px; background: rgba(120,140,255,0.18); color: #cdd6ff; }
.ghost {
  background: transparent; border: 1px solid var(--line); color: var(--muted);
  border-radius: 8px; padding: 0.35rem 0.7rem; cursor: pointer; font-size: 0.85rem;
  transition: color 150ms, border-color 150ms;
}
.ghost:hover { color: var(--text); border-color: var(--muted); }
.ghost:disabled { opacity: 0.45; cursor: not-allowed; }

.pane { flex: 1; min-height: 0; display: flex; flex-direction: column; }

/* 对话流 */
.chat { flex: 1; min-height: 0; overflow-y: auto; padding: 1.2rem; display: flex; flex-direction: column; gap: 0.9rem; }
.empty-hint { color: var(--muted); text-align: center; margin-top: 3rem; font-size: 0.95rem; }
.msg { max-width: 80%; padding: 0.7rem 0.95rem; border-radius: var(--radius); line-height: 1.6; white-space: pre-wrap; }
.msg.user { align-self: flex-end; background: var(--accent); color: oklch(20% 0.02 50); }
.msg.assistant { align-self: flex-start; background: var(--bg-soft); border: 1px solid var(--line); }
.msg.media { align-self: flex-start; max-width: 80%; padding: 0; background: transparent; }
.inline-video { width: 100%; border-radius: var(--radius); border: 1px solid var(--line); background: #000; display: block; }
.media-title { font-size: 0.82rem; color: var(--muted); margin-top: 0.35rem; }

/* tool_call 折叠卡 */
.tool-card {
  align-self: flex-start; max-width: 80%;
  background: var(--bg-panel); border: 1px solid var(--line); border-radius: 10px;
  font-size: 0.88rem;
}
.tool-card summary { cursor: pointer; padding: 0.55rem 0.8rem; list-style: none; display: flex; align-items: center; gap: 0.5rem; }
.tool-card summary::-webkit-details-marker { display: none; }
.tool-card .badge { font-weight: 700; }
.tool-card.ok .badge { color: var(--ok); }
.tool-card.error .badge { color: var(--err); }
.tool-card .summary-text { color: var(--text); }
.tool-card .detail { padding: 0 0.8rem 0.7rem; color: var(--muted); white-space: pre-wrap; line-height: 1.6; }

/* composer */
.composer { border-top: 1px solid var(--line); padding: 0.9rem 1.2rem; display: flex; flex-direction: column; gap: 0.6rem; }
.composer textarea {
  width: 100%; background: var(--bg-soft); color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0.8rem 1rem; font-size: 1rem; line-height: 1.6; resize: vertical;
}
.composer textarea:focus { outline: none; border-color: var(--accent); }
.composer-row { display: flex; align-items: center; gap: 0.6rem; }
.aspect {
  background: var(--bg-soft); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 0.4rem 0.6rem; font-size: 0.85rem; cursor: pointer;
}
#send-btn {
  margin-left: auto; background: var(--accent); color: oklch(20% 0.02 50);
  border: none; border-radius: 999px; padding: 0.55rem 1.6rem; font-weight: 700; cursor: pointer;
  transition: transform 150ms cubic-bezier(0.16,1,0.3,1), opacity 150ms;
}
#send-btn:hover { transform: translateY(-1px); }
#send-btn:disabled { opacity: 0.5; cursor: progress; transform: none; }

/* 资产库 */
.assets-bar { display: flex; align-items: center; gap: 0.9rem; padding: 1rem 1.2rem; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.filters { display: flex; gap: 0.35rem; }
.filter { background: transparent; border: 1px solid var(--line); color: var(--muted); border-radius: 999px; padding: 0.35rem 0.9rem; cursor: pointer; font-size: 0.85rem; }
.filter.active { color: var(--text); background: var(--bg-panel); border-color: var(--muted); }
.upload-group { margin-left: auto; display: inline-flex; gap: 0.5rem; align-items: center; }
.assets-grid {
  flex: 1; min-height: 0; overflow-y: auto; padding: 1.2rem;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 0.9rem; align-content: start;
}
.asset-card { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.asset-card .thumb { width: 100%; aspect-ratio: 9 / 16; object-fit: cover; background: #000; display: block; }
.asset-card video.thumb { aspect-ratio: 9 / 16; }
.asset-card .meta { padding: 0.5rem 0.6rem; font-size: 0.78rem; color: var(--muted); }
.asset-card .meta .t { color: var(--text); display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ---- 右栏资源面板 ---- */
.resources { background: var(--bg-soft); border-left: 1px solid var(--line); display: flex; flex-direction: column; min-width: 0; }
.resources.collapsed { grid-column: auto; }
.res-head { display: flex; align-items: center; justify-content: space-between; padding: 0.85rem 1rem; border-bottom: 1px solid var(--line); font-weight: 600; }
.res-body { flex: 1; min-height: 0; overflow-y: auto; padding: 0.9rem 1rem; display: flex; flex-direction: column; gap: 1rem; }
.res-group h3 { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 0.5rem; }
.res-cards { display: flex; flex-direction: column; gap: 0.5rem; }
.res-card { background: var(--bg-panel); border: 1px solid var(--line); border-radius: 8px; padding: 0.5rem 0.65rem; font-size: 0.82rem; }
.res-card a { color: var(--accent); text-decoration: none; }
.res-card .empty { color: var(--muted); font-size: 0.8rem; }
.res-card video { width: 100%; border-radius: 6px; margin-top: 0.4rem; background: #000; }

/* ---- 账户/登录遮罩（沿用） ---- */
.login-mask { position: fixed; inset: 0; background: rgba(8,10,18,0.78); display: flex; align-items: center; justify-content: center; z-index: 50; }
.login-card { width: min(92vw, 360px); background: #141826; border: 1px solid #2a3145; border-radius: 14px; padding: 1.6rem; display: flex; flex-direction: column; gap: 0.7rem; }
.login-card h2 { margin: 0; color: #eef; }
.login-tip { margin: 0; font-size: 0.82rem; color: #889; }
.login-card input { padding: 0.6rem 0.7rem; border-radius: 8px; border: 1px solid #2a3145; background: #0e1220; color: #eef; }
.login-card button { padding: 0.6rem; border-radius: 8px; border: none; background: #5566ff; color: #fff; cursor: pointer; }
.login-card button:disabled { opacity: 0.5; cursor: default; }
.login-err { margin: 0; min-height: 1rem; font-size: 0.8rem; color: #ff8080; }

/* ---- 响应式 ---- */
@media (max-width: 980px) {
  .app { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  .sidebar { flex-direction: row; align-items: center; overflow-x: auto; }
  .hist { display: none; }
  .resources { display: none; }
}