* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, sans-serif; background: #f1f5f9; color: #1e293b; }
.screen { min-height: 100vh; }
.hidden { display: none !important; }
.login-card { max-width: 360px; margin: 10vh auto; padding: 2rem; background: #fff; border-radius: 12px; box-shadow: 0 4px 24px rgba(0,0,0,.08); }
.login-card input, .login-card button { width: 100%; margin: .5rem 0; padding: .75rem; border: 1px solid #e2e8f0; border-radius: 8px; }
.login-card button { background: #2563eb; color: #fff; border: none; cursor: pointer; }
.error { color: #dc2626; font-size: .9rem; }
.legal-links { margin-top: 1.25rem; text-align: center; font-size: .85rem; }
.legal-links a { color: #64748b; text-decoration: none; }
.legal-links a:hover { color: #2563eb; }
#app { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
.sidebar { background: #1e293b; color: #fff; padding: 1.5rem 1rem; }
.sidebar h2 { margin: 0 0 1.5rem; font-size: 1.1rem; }
.sidebar nav a { display: block; color: #cbd5e1; text-decoration: none; padding: .5rem .75rem; border-radius: 6px; margin-bottom: .25rem; }
.sidebar nav a.active, .sidebar nav a:hover { background: #334155; color: #fff; }
.logout { margin-top: 2rem; width: 100%; padding: .5rem; background: transparent; border: 1px solid #475569; color: #94a3b8; border-radius: 6px; cursor: pointer; }
.content { padding: 1.5rem 2rem; overflow: auto; }
.page h1 { margin-top: 0; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 1rem; }
.stat-card { background: #fff; padding: 1.25rem; border-radius: 10px; border: 1px solid #e2e8f0; }
.stat-card .value { font-size: 2rem; font-weight: 700; color: #2563eb; }
.stat-card .label { color: #64748b; font-size: .85rem; }
.filters { display: flex; gap: .5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.filters select, .filters button { padding: .5rem .75rem; border-radius: 6px; border: 1px solid #e2e8f0; }
.split-view { display: grid; grid-template-columns: 320px 1fr; gap: 1rem; min-height: 60vh; }
.conv-list { background: #fff; border-radius: 10px; border: 1px solid #e2e8f0; overflow-y: auto; max-height: 70vh; }
.conv-item { padding: .75rem 1rem; border-bottom: 1px solid #f1f5f9; cursor: pointer; }
.conv-item:hover, .conv-item.active { background: #eff6ff; }
.conv-item .name { font-weight: 600; }
.conv-item .meta { font-size: .75rem; color: #64748b; }
.badge { display: inline-block; padding: .1rem .4rem; border-radius: 4px; font-size: .7rem; font-weight: 600; }
.badge-A { background: #dcfce7; color: #166534; }
.badge-B { background: #dbeafe; color: #1e40af; }
.badge-C { background: #fef3c7; color: #92400e; }
.badge-D { background: #fee2e2; color: #991b1b; }
.badge-pending { background: #fce7f3; color: #9d174d; }
.conv-detail { background: #fff; border-radius: 10px; border: 1px solid #e2e8f0; display: flex; flex-direction: column; max-height: 70vh; }
.messages { flex: 1; overflow-y: auto; padding: 1rem; }
.msg { margin-bottom: .75rem; max-width: 85%; }
.msg.customer { margin-right: auto; }
.msg.ai, .msg.admin { margin-left: auto; }
.msg .bubble { padding: .6rem .85rem; border-radius: 12px; font-size: .9rem; }
.msg.customer .bubble { background: #e2e8f0; }
.msg.ai .bubble { background: #dbeafe; }
.msg.admin .bubble { background: #2563eb; color: #fff; }
.msg .role { font-size: .7rem; color: #64748b; margin-bottom: .2rem; }
.reply-box { padding: 1rem; border-top: 1px solid #e2e8f0; display: flex; gap: .5rem; }
.reply-box textarea { flex: 1; padding: .5rem; border-radius: 8px; border: 1px solid #e2e8f0; resize: vertical; min-height: 60px; }
.reply-box button { padding: .5rem 1rem; background: #2563eb; color: #fff; border: none; border-radius: 8px; cursor: pointer; }
.actions { padding: .5rem 1rem; display: flex; gap: .5rem; flex-wrap: wrap; }
.actions button { padding: .4rem .75rem; border-radius: 6px; border: 1px solid #e2e8f0; background: #fff; cursor: pointer; font-size: .85rem; }
.actions button.primary { background: #2563eb; color: #fff; border-color: #2563eb; }
.table-wrap { background: #fff; border-radius: 10px; border: 1px solid #e2e8f0; overflow: auto; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { padding: .6rem 1rem; text-align: left; border-bottom: 1px solid #f1f5f9; }
th { background: #f8fafc; }
.placeholder { color: #94a3b8; padding: 2rem; text-align: center; }
@media (max-width: 900px) {
  #app { grid-template-columns: 1fr; }
  .split-view { grid-template-columns: 1fr; }
}