/* web/style.css */
:root{
  --bg1: #f4f6fb;
  --bg2: #eef1f8;
  --card: rgba(255,255,255,0.70);
  --stroke: rgba(0,0,0,0.08);
  --text: #101828;
  --muted: rgba(16,24,40,0.55);
  --shadow: 0 18px 60px rgba(16,24,40,0.10);
}

*{ box-sizing: border-box; }
body{
  margin:0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC","Hiragino Sans","Noto Sans CJK SC","Noto Sans JP", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 700px at 20% 10%, #ffffff 0%, var(--bg1) 55%, var(--bg2) 100%);
}

.wrap{
  max-width: 980px;
  margin: 28px auto;
  padding: 0 16px;
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 18px 18px;
  border: 1px solid var(--stroke);
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.brand-title{ font-size: 22px; font-weight: 800; letter-spacing: 0.3px; }
.brand-sub{ margin-top: 4px; font-size: 13px; color: var(--muted); }

.panel{
  margin-top: 14px;
  border: 1px solid var(--stroke);
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  padding: 14px;
}

.chat{
  height: 520px;
  overflow:auto;
  padding: 10px;
}

.empty{ padding: 30px 14px; text-align:center; color: var(--muted); }
.empty-title{ font-weight: 800; color: var(--text); font-size: 18px; }
.empty-sub{ margin-top: 6px; font-size: 13px; }

.bubble{
  max-width: 78%;
  padding: 10px 12px;
  margin: 10px 0;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,0.70);
}

.bubble.user{
  margin-left: auto;
  background: rgba(230, 238, 255, 0.75);
}

.bubble.assistant{
  margin-right: auto;
}

.meta{
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}

.text{
  white-space: pre-wrap;
  line-height: 1.5;
  font-size: 15px;
}

.composer{
  display:flex;
  gap: 10px;
  padding: 12px 10px 8px 10px;
}

.input{
  flex:1;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  outline: none;
  background: rgba(255,255,255,0.85);
  font-size: 15px;
}

.btn{
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,0.85);
  cursor:pointer;
  font-weight: 700;
}

.btn.primary{
  background: rgba(90, 120, 255, 0.92);
  border: none;
  color: white;
}

.btn.ghost{
  background: transparent;
}

.hint{
  padding: 0 10px 10px 10px;
  font-size: 12px;
  color: var(--muted);
}