* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Prompt', -apple-system, 'Segoe UI', sans-serif;
  background: #F1F5F9;
  color: #0F172A;
}
.si-top { background: #0B1120; color: #FFFFFF; }
.si-top-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.si-top h1 { margin: 0; font-size: 19px; font-weight: 700; flex: 1; }
.si-back { color: #93C5FD; text-decoration: none; font-size: 13.5px; }
.si-badge {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.18);
  color: #E2E8F0;
}
.si-badge.ok { background: rgba(16, 185, 129, 0.22); color: #6EE7B7; }
.si-badge.warn { background: rgba(234, 179, 8, 0.22); color: #FDE047; }
.si-main { max-width: 1180px; margin: 0 auto; padding: 18px; }
.si-gate {
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 14px;
  padding: 24px;
  max-width: 520px;
  margin: 40px auto;
  text-align: center;
  line-height: 1.6;
}
.si-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 40px;
  padding: 0 16px;
  border-radius: 10px;
  border: none;
  background: #2563EB;
  color: #FFFFFF;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.si-btn:disabled { opacity: 0.55; cursor: not-allowed; }
.si-btn.ghost { background: #FFFFFF; color: #334155; border: 1px solid #CBD5E1; }
.si-app {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
  align-items: start;
}
.si-list-pane, .si-thread-pane {
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 14px;
  overflow: hidden;
}
.si-filters {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  padding: 8px;
  border-bottom: 1px solid #E2E8F0;
}
.si-filter {
  border: 1px solid transparent;
  background: transparent;
  border-radius: 8px;
  height: 34px;
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 600;
  color: #64748B;
  cursor: pointer;
}
.si-filter.is-active { background: #EFF6FF; color: #1D4ED8; border-color: #BFDBFE; }
.si-filter span { font-variant-numeric: tabular-nums; }
.si-list { max-height: calc(100vh - 190px); overflow-y: auto; }
.si-item {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  border-bottom: 1px solid #F1F5F9;
  background: #FFFFFF;
  padding: 12px 14px;
  font-family: inherit;
  cursor: pointer;
}
.si-item:hover { background: #F8FAFC; }
.si-item.is-active { background: #EFF6FF; }
.si-item-top { display: flex; justify-content: space-between; gap: 8px; font-size: 12px; color: #64748B; }
.si-item-id { font-weight: 700; color: #0F172A; }
.si-item-name { font-size: 13.5px; font-weight: 600; margin-top: 3px; color: #0F172A; }
.si-item-issue {
  font-size: 12.8px;
  color: #475569;
  margin-top: 2px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.si-pill {
  font-size: 11px;
  font-weight: 700;
  padding: 1px 8px;
  border-radius: 999px;
  border: 1px solid #CBD5E1;
}
.si-pill.open { color: #B45309; border-color: #FCD34D; background: #FFFBEB; }
.si-pill.answered { color: #047857; border-color: #6EE7B7; background: #ECFDF5; }
.si-pill.closed { color: #64748B; }
.si-empty { padding: 40px 20px; text-align: center; color: #64748B; }
.si-thread-head { padding: 16px 18px; border-bottom: 1px solid #E2E8F0; }
.si-thread-head h2 { margin: 0 0 6px; font-size: 17px; }
.si-meta { font-size: 13px; color: #475569; line-height: 1.7; }
.si-meta code {
  background: #F1F5F9;
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 12.5px;
}
.si-quick { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.si-msgs { padding: 16px 18px; display: flex; flex-direction: column; gap: 12px; max-height: 46vh; overflow-y: auto; }
.si-msg { max-width: 86%; }
.si-msg.customer { align-self: flex-start; }
.si-msg.admin { align-self: flex-end; text-align: right; }
.si-msg-meta { font-size: 11.5px; color: #64748B; margin-bottom: 3px; }
.si-msg-body {
  display: inline-block;
  text-align: left;
  padding: 10px 13px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}
.si-msg.customer .si-msg-body { background: #F1F5F9; border: 1px solid #E2E8F0; }
.si-msg.admin .si-msg-body { background: #2563EB; color: #FFFFFF; }
.si-reply { padding: 14px 18px 18px; border-top: 1px solid #E2E8F0; display: flex; flex-direction: column; gap: 10px; }
.si-reply textarea {
  width: 100%;
  min-height: 110px;
  padding: 11px 13px;
  border-radius: 10px;
  border: 1px solid #CBD5E1;
  font-family: inherit;
  font-size: 14.5px;
  line-height: 1.55;
  resize: vertical;
}
.si-reply-actions { display: flex; gap: 8px; justify-content: space-between; flex-wrap: wrap; align-items: center; }
.si-hint { font-size: 12.5px; color: #64748B; }
.si-status {
  font-size: 13px;
  padding: 10px 12px;
  border-radius: 10px;
  white-space: pre-line;
  word-break: break-word;
}
.si-status.ok { background: #ECFDF5; border: 1px solid #6EE7B7; color: #065F46; }
.si-status.err { background: #FEF2F2; border: 1px solid #FCA5A5; color: #991B1B; }
@media (max-width: 860px) {
  .si-app { grid-template-columns: 1fr; }
  .si-list { max-height: 320px; }
  .si-msgs { max-height: none; }
  .si-reply textarea { font-size: 16px; }
}