:root {
  --bg: #fff6f1;
  --panel: #ffffff;
  --line: #f0d5cb;
  --rose: #e85d75;
  --rose-2: #ff8a9a;
  --gold: #c4784a;
  --text: #3d2a28;
  --muted: #8a6d68;
  --user: #ffe0e6;
  --bot: #ffffff;
  --shadow: 0 10px 30px rgba(180, 90, 80, 0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(900px 500px at 8% -10%, rgba(255, 184, 194, 0.45), transparent 55%),
    radial-gradient(700px 420px at 92% 0%, rgba(255, 220, 180, 0.35), transparent 50%),
    radial-gradient(600px 500px at 70% 100%, rgba(255, 210, 200, 0.28), transparent 45%),
    #fff8f4;
  pointer-events: none;
}

.app {
  display: grid;
  grid-template-columns: 320px 1fr;
  height: 100vh;
  position: relative;
}

.side, .main {
  position: relative;
  z-index: 1;
}

.side {
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(18px);
  padding: 28px 22px;
  overflow: auto;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 22px;
}

.logo {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #ff6b81, #ffc4a8);
  color: #fff;
  font-weight: 700;
  font-size: 22px;
}

h1 { margin: 0; font-size: 22px; letter-spacing: 1px; }
.brand p, .hint, .status, .top span { color: var(--muted); }

h2 {
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--gold);
  margin: 22px 0 10px;
}

.status {
  font-size: 13px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.chips { display: flex; flex-direction: column; gap: 8px; }

.chip, .ghost, #send {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 12px;
  cursor: pointer;
}

.chip {
  text-align: left;
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.5;
}

.chip:hover, .ghost:hover { border-color: var(--rose); background: #fff4f5; }

.hint { font-size: 13px; line-height: 1.7; }
.ghost { padding: 8px 12px; font-size: 13px; }

.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.7);
}

.top span { margin-left: 10px; font-size: 13px; }

.thread {
  flex: 1;
  overflow: auto;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.welcome, .msg {
  max-width: 760px;
}

.welcome {
  padding: 8px 4px 18px;
}

.welcome h3 { margin: 0 0 8px; font-size: 28px; }
.welcome p { margin: 0; color: var(--muted); line-height: 1.7; }

.msg { display: flex; }
.msg.user { justify-content: flex-end; }
.msg.bot { flex-direction: column; align-items: flex-start; }
.bubble {
  max-width: 78%;
  padding: 14px 16px;
  border-radius: 18px;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
  box-shadow: var(--shadow);
}
.msg.user .bubble {
  background: linear-gradient(135deg, #ff8aa0, #ffb3a7);
  color: #4a1d24;
  border-bottom-right-radius: 6px;
}
.msg.bot .bubble {
  background: var(--bot);
  border: 1px solid var(--line);
  border-bottom-left-radius: 6px;
}

.sources {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.source {
  font-size: 11px;
  color: var(--gold);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 8px;
  background: #fff8f3;
}

.thinking {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}

.rate {
  margin-top: 8px;
  max-width: 78%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}
.rate p {
  margin: 0 0 8px;
  font-size: 12px;
  color: var(--muted);
}
.rate-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.rate-btns button {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  cursor: pointer;
}
.rate-btns button:hover,
.rate-btns button.active {
  background: var(--rose);
  color: #fff;
  border-color: var(--rose);
}
.rate.done p { color: var(--gold); }

.composer {
  display: flex;
  gap: 12px;
  padding: 16px 28px 24px;
  border-top: 1px solid var(--line);
  background: rgba(255,255,255,0.8);
}

textarea {
  flex: 1;
  resize: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 16px;
  padding: 12px 14px;
  font: inherit;
  outline: none;
}

textarea:focus { border-color: var(--rose); }

#send {
  min-width: 88px;
  background: linear-gradient(135deg, #ff6b81, #ffb199);
  color: #fff;
  font-weight: 700;
  border: none;
}

#send:disabled { opacity: 0.5; cursor: not-allowed; }

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .side {
    display: block;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 16px;
  }
  .brand p,
  #status,
  .side section:nth-of-type(2),
  .side section:nth-of-type(3) {
    display: none;
  }
}

.rels {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.rel {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 12px;
  cursor: pointer;
}
.rel.active {
  border-color: var(--rose);
  background: #ffe6ea;
  color: #9a2d40;
}
.badge {
  margin-left: 10px;
  font-size: 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
  color: var(--gold);
  background: #fff;
}