:root {
  --bg-0: #f4f9f7;
  --bg-1: #e5f1ec;
  --bg-2: #ecf4fb;
  --panel: #fdfdfb;
  --ink: #102124;
  --ink-soft: #4f6368;
  --line: #c9d8d5;
  --accent: #0b7285;
  --user-a: #e1f4ff;
  --user-b: #f3fbff;
  --assistant-a: #eef8e6;
  --assistant-b: #f8fff2;
  --shadow: 0 8px 24px rgba(13, 38, 33, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  background:
    radial-gradient(1200px 620px at -10% -20%, #d1efe4 0%, transparent 70%),
    radial-gradient(900px 500px at 105% -12%, #d6e8f7 0%, transparent 68%),
    linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 45%, var(--bg-2) 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

.topbar {
  display: none;
}

main {
  padding: 14px 14px 30px;
}

.timeline {
  max-width: 980px;
  margin: 0 auto;
  display: grid;
  gap: 10px;
  padding: 10px 0;
}

.msg {
  width: fit-content;
  max-width: min(78%, 78ch);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 10px 12px;
  box-shadow: var(--shadow);
  opacity: 1;
  transform: none;
}

.msg.user {
  margin-left: auto;
  background: linear-gradient(170deg, var(--user-a) 0%, var(--user-b) 100%);
}

.msg.assistant {
  margin-right: auto;
  background: linear-gradient(170deg, var(--assistant-a) 0%, var(--assistant-b) 100%);
}

.msg-head {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.badge {
  display: inline-flex;
  align-items: center;
  height: 24px;
  border-radius: 999px;
  padding: 0 9px;
  border: 1px solid #bdd0cb;
  background: rgba(255, 255, 255, 0.84);
  font-size: 12px;
}

.badge.role {
  border-color: #9fbdb7;
  color: #26454d;
}

.turn,
.time {
  font-size: 12px;
  color: var(--ink-soft);
}

.text {
  margin: 0;
  white-space: pre-wrap;
  font-family: "Berkeley Mono", "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 1.48;
  color: #17262a;
  max-width: 100%;
  overflow-x: auto;
  overflow-wrap: anywhere;
  word-break: break-word;
}

@media (max-width: 960px) {
  .msg,
  .msg.user,
  .msg.assistant {
    width: fit-content;
    max-width: 92%;
  }
}

@media (max-width: 640px) {
  main {
    padding: 12px 10px 20px;
  }
}