/* ── CSS 变量 ─────────────────────────────────────────── */
:root {
  --bg-deep:    #0d0f1a;
  --bg-card:    #141726;
  --bg-sidebar: #111322;
  --bg-input:   #1a1d30;
  --border:     #2a2d45;
  --accent:     #6366f1;
  --accent-2:   #8b5cf6;
  --text:       #e2e4f0;
  --text-muted: #6b7280;
  --error:      #ef4444;
  --success:    #22c55e;
  --warning:    #f59e0b;
  --msg-user:   #1e2346;
  --msg-ai:     #181b2e;
}

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

html, body {
  height: 100%;
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  font-size: 15px;
}

/* ── 滚动条 ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── 布局骨架 ────────────────────────────────────────── */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 56px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1.5rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0,0,0,.4);
}
.topbar-left { display: flex; align-items: center; gap: 1rem; }
.topbar-right { display: flex; align-items: center; gap: 1rem; }
.logo-text { font-weight: 700; font-size: 1rem; color: var(--accent); }
.role-tag {
  font-size: .75rem; background: rgba(99,102,241,.15);
  color: var(--accent); padding: .2rem .6rem; border-radius: 20px; border: 1px solid var(--accent);
}
.user-badge { font-size: .9rem; color: var(--text-muted); }
.btn-ghost {
  background: transparent; border: 1px solid var(--border); color: var(--text-muted);
  padding: .35rem .9rem; border-radius: 6px; cursor: pointer; font-size: .85rem;
  transition: all .2s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.app-layout {
  display: flex;
  margin-top: 56px;
  height: calc(100vh - 56px);
}

.sidebar {
  width: 200px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 1rem 0;
}
.sidebar-nav { display: flex; flex-direction: column; gap: .25rem; padding: 0 .75rem; }
.nav-item {
  display: flex; align-items: center; gap: .75rem;
  padding: .7rem 1rem; border-radius: 8px; cursor: pointer;
  color: var(--text-muted); font-size: .9rem; transition: all .2s;
}
.nav-item:hover { background: rgba(99,102,241,.08); color: var(--text); }
.nav-item.active { background: rgba(99,102,241,.15); color: var(--accent); font-weight: 600; }
.nav-icon { font-size: 1.1rem; }

.main-content { flex: 1; overflow: hidden; position: relative; }

.view { display: none; height: 100%; overflow: hidden; }
.view.active { display: flex; flex-direction: column; }

/* ── 通用组件 ────────────────────────────────────────── */
.loading { color: var(--text-muted); padding: 2rem; text-align: center; }
.empty { color: var(--text-muted); text-align: center; padding: 1.5rem; }

.score-star {
  display: inline-flex; align-items: center; gap: .25rem;
  font-size: .85rem; font-weight: 600;
}
.score-star.innovation { color: #f59e0b; }
.score-star.depth { color: #6366f1; }