/* ============================================================
   围炉夜话 · 视觉主题
   设计语言：深夜炉火——暖色暗底、底部火光、上升火星、羊皮纸质感的对话气泡。
   人设保留各自的标识色，像一圈颜色各异的灯笼围在火边。
   ============================================================ */

:root {
  /* 底色：偏暖的深夜，而非中性灰蓝 */
  --bg-0: #0d0906;
  --bg-1: #171009;
  --panel: rgba(32, 23, 15, 0.82);
  --panel-2: #251b12;
  --line: rgba(232, 150, 60, 0.16);
  --line-strong: rgba(232, 150, 60, 0.38);

  /* 火色系 */
  --ember: #e8963c;
  --ember-bright: #ffb35c;
  --ember-deep: #c9421a;
  --ember-soft: rgba(232, 150, 60, 0.14);
  --gold: #f0c07a;

  --text: #f3e8d7;
  --muted: #a88f76;
  --danger: #d9694a;

  --font-display: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --radius: 14px;
  --shadow-panel: 0 10px 40px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(ellipse 90% 55% at 50% 118%, rgba(201, 66, 26, 0.28) 0%, rgba(201, 66, 26, 0.08) 45%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 50% 125%, rgba(255, 179, 92, 0.16) 0%, transparent 70%),
    linear-gradient(180deg, var(--bg-1) 0%, var(--bg-0) 100%);
  background-attachment: fixed;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ---------- 炉火氛围层 ---------- */
.fire-glow {
  position: fixed;
  left: 50%;
  bottom: -180px;
  width: 720px;
  height: 420px;
  transform: translateX(-50%);
  pointer-events: none;
  background: radial-gradient(ellipse at center, rgba(255, 160, 60, 0.22) 0%, rgba(232, 120, 40, 0.10) 40%, transparent 70%);
  filter: blur(6px);
  animation: breathe 5.5s ease-in-out infinite;
  z-index: 0;
}

@keyframes breathe {
  0%, 100% { opacity: 0.75; transform: translateX(-50%) scale(1); }
  50% { opacity: 1; transform: translateX(-50%) scale(1.06); }
}

.embers { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 0; }
.embers span {
  position: absolute;
  bottom: -12px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--ember-bright);
  box-shadow: 0 0 8px 2px rgba(255, 179, 92, 0.5);
  opacity: 0;
  animation-name: rise;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

@keyframes rise {
  0% { transform: translateY(0) translateX(0) scale(0.6); opacity: 0; }
  8% { opacity: 0.9; }
  70% { opacity: 0.55; }
  100% { transform: translateY(-102vh) translateX(26px) scale(1); opacity: 0; }
}

/* ---------- 顶栏 ---------- */
.topbar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 22px;
  background: linear-gradient(180deg, rgba(38, 27, 17, 0.92), rgba(28, 20, 13, 0.82));
  border-bottom: 1px solid var(--line);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  flex-wrap: wrap;
  backdrop-filter: blur(8px);
}

.room-info { display: flex; align-items: center; gap: 12px; }

.flame { filter: drop-shadow(0 0 10px rgba(255, 150, 60, 0.55)); animation: flicker 2.6s ease-in-out infinite; transform-origin: 50% 90%; }
@keyframes flicker {
  0%, 100% { transform: scale(1) rotate(-1deg); opacity: 0.92; }
  40% { transform: scale(1.06) rotate(1.5deg); opacity: 1; }
  70% { transform: scale(0.98) rotate(-0.5deg); opacity: 0.86; }
}

.room-info h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.14em;
  background: linear-gradient(180deg, #ffe6bd 20%, var(--ember) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.status {
  font-size: 12px;
  padding: 3px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  white-space: nowrap;
}
.status.discussing {
  color: #ffd9a3;
  border-color: var(--line-strong);
  background: var(--ember-soft);
  box-shadow: 0 0 14px rgba(232, 150, 60, 0.25);
  animation: pulse 1.6s ease-in-out infinite;
}
.status.paused { color: #c9b8a4; border-color: rgba(201, 184, 164, 0.3); }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.62; } }

.controls { display: flex; gap: 8px; }

/* ---------- 按钮 ---------- */
.btn {
  font-family: var(--font-body);
  background: rgba(58, 42, 27, 0.55);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 7px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.18s, background 0.18s, transform 0.12s, box-shadow 0.18s;
}
.btn:hover { border-color: var(--line-strong); background: rgba(74, 53, 33, 0.65); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.btn.primary {
  background: linear-gradient(180deg, var(--ember-bright), var(--ember));
  border-color: rgba(255, 200, 130, 0.5);
  color: #2a1607;
  font-weight: 600;
  box-shadow: 0 4px 18px rgba(232, 150, 60, 0.28);
}
.btn.primary:hover { background: linear-gradient(180deg, #ffc178, #f0a04c); box-shadow: 0 4px 22px rgba(232, 150, 60, 0.42); }

.btn.ghost { background: transparent; }
.btn.danger { color: #f0a08a; border-color: rgba(217, 105, 74, 0.35); }
.btn.danger:hover { border-color: rgba(217, 105, 74, 0.7); background: rgba(217, 105, 74, 0.12); }

.btn:focus-visible, .composer input:focus-visible {
  outline: 2px solid var(--ember);
  outline-offset: 2px;
}

/* ---------- 布局 ---------- */
.layout {
  position: relative;
  z-index: 1;
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 288px;
  min-height: 0;
}

.chat { display: flex; flex-direction: column; min-height: 0; }

/* ---------- 消息流 ---------- */
.messages {
  flex: 1;
  overflow-y: auto;
  margin: 0;
  padding: 22px 24px 8px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(232, 150, 60, 0.35) transparent;
}
.messages::-webkit-scrollbar { width: 8px; }
.messages::-webkit-scrollbar-thumb { background: rgba(232, 150, 60, 0.28); border-radius: 4px; }
.messages::-webkit-scrollbar-thumb:hover { background: rgba(232, 150, 60, 0.45); }

.msg { display: flex; gap: 11px; max-width: 78%; animation: settle 0.35s ease both; }
@keyframes settle { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.msg.host { align-self: flex-end; flex-direction: row-reverse; }

/* 头像：像围在火边的一盏盏灯笼 */
.avatar {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  flex: none;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-family: var(--font-display);
  color: #1a1008;
  font-size: 16px;
  position: relative;
  box-shadow: 0 0 0 1px rgba(255, 220, 170, 0.22), 0 0 18px -2px var(--lantern, rgba(255, 220, 170, 0.4));
}

.bubble {
  background: linear-gradient(180deg, rgba(43, 31, 20, 0.92), rgba(33, 24, 16, 0.92));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 9px 14px;
  font-size: 14px;
  line-height: 1.75;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.28);
}

.msg.host .bubble {
  background: linear-gradient(180deg, rgba(94, 60, 22, 0.92), rgba(66, 41, 15, 0.92));
  border-color: rgba(255, 190, 110, 0.4);
}

.msg.speaking .bubble { border-color: var(--ember); box-shadow: 0 0 0 1px var(--ember-soft), 0 4px 20px rgba(232, 150, 60, 0.22); }

.meta { font-size: 12px; color: var(--muted); margin-bottom: 4px; display: flex; gap: 8px; align-items: baseline; }
.meta .name { font-weight: 600; color: var(--gold); font-family: var(--font-display); letter-spacing: 0.04em; }
.msg.host .meta { flex-direction: row-reverse; }

.mention {
  color: var(--ember-bright);
  background: var(--ember-soft);
  border-radius: 5px;
  padding: 0 3px;
}

/* 思考 / 发言状态点：炉火的火星 */
.thinking, .speaking-dot {
  position: absolute;
  inset: -4px -4px auto auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  animation: pulse 0.9s infinite alternate;
}
.thinking { background: #e3c158; box-shadow: 0 0 10px 2px rgba(227, 193, 88, 0.55); }
.speaking-dot { background: var(--ember-bright); box-shadow: 0 0 12px 3px rgba(255, 179, 92, 0.7); }

/* ---------- 讨论总结卡片 ---------- */
.msg.summary { align-self: center; max-width: 94%; }
.msg.summary .bubble {
  background: linear-gradient(180deg, rgba(48, 35, 22, 0.94), rgba(38, 27, 17, 0.94));
  border: 1px dashed var(--line-strong);
  white-space: pre-wrap;
  font-size: 13.5px;
  color: #f7ead4;
}
.msg.summary .meta { justify-content: center; }
.msg.summary .meta .name { color: var(--ember-bright); }

/* ---------- 输入区 ---------- */
.composer-top { padding: 10px 24px 0; }
.composer-top .btn { font-size: 12px; padding: 5px 13px; }

.composer {
  display: flex;
  gap: 10px;
  padding: 10px 24px 16px;
}
.composer input {
  flex: 1;
  background: rgba(20, 14, 9, 0.85);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 16px;
  color: var(--text);
  font-size: 14px;
  font-family: var(--font-body);
  transition: border-color 0.18s, box-shadow 0.18s;
}
.composer input::placeholder { color: rgba(168, 143, 118, 0.75); }
.composer input:focus { outline: none; border-color: var(--ember); box-shadow: 0 0 0 3px var(--ember-soft); }

/* ---------- 侧栏 ---------- */
.sidebar {
  border-left: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(30, 22, 14, 0.86), rgba(22, 16, 10, 0.86));
  padding: 18px;
  overflow-y: auto;
  backdrop-filter: blur(6px);
}
.sidebar h2 {
  font-size: 14px;
  margin: 0 0 14px;
  font-family: var(--font-display);
  letter-spacing: 0.1em;
  color: var(--gold);
}
.muted { color: var(--muted); font-weight: 400; font-size: 12px; }

.agents { list-style: none; margin: 0 0 22px; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.agents li {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: background 0.2s, border-color 0.2s;
}
.agents li.active { border-color: var(--line-strong); background: var(--ember-soft); }
.agents .avatar { width: 32px; height: 32px; font-size: 14px; border-radius: 10px; }
.agents .who { font-size: 13px; font-weight: 600; font-family: var(--font-display); letter-spacing: 0.04em; }
.agents .what { font-size: 11.5px; color: var(--muted); margin-top: 1px; }

.legend { font-size: 12px; color: var(--muted); line-height: 1.8; border-top: 1px solid var(--line); padding-top: 14px; }
.legend h3 { font-size: 12.5px; margin: 0 0 8px; color: var(--gold); font-family: var(--font-display); letter-spacing: 0.1em; }
.legend p { margin: 0 0 8px; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .msg { max-width: 92%; }
}

/* 尊重系统的减弱动效设置 */
@media (prefers-reduced-motion: reduce) {
  .embers, .fire-glow, .flame, .status.discussing, .msg { animation: none; }
  .embers span { display: none; }
}