/* ── Hero 两列布局 ── */
.hero-inner {
  display: flex;
  align-items: center;
  gap: 48px;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
}
.hero-left-col {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-chat-col {
  flex: 1;
  min-width: 0;
  max-width: 420px;
}

/* ══════════════════════════════════════════
   暗色模式：绿磷光屏 (default)
══════════════════════════════════════════ */
:root {
  --rc-bg:         #000;
  --rc-bg2:        #000a00;
  --rc-bg3:        #001a00;
  --rc-border:     #00cc33;
  --rc-border2:    #003300;
  --rc-title-bg:   #001a00;
  --rc-conn-bg:    #000a00;
  --rc-conn-color: #006600;
  --rc-sys:        #004400;
  --rc-time:       #005500;
  --rc-nick-bot:   #00ff41;
  --rc-nick-usr:   #33ff99;
  --rc-msg-bot:    #00cc33;
  --rc-msg-usr:    #7fffb0;
  --rc-input-bg:   #000500;
  --rc-prompt:     #00ff41;
  --rc-cursor:     #00ff41;
  --rc-hint:       #003300;
  --rc-hint-bg:    #000a00;
  --rc-scan:       rgba(0,0,0,0.12);
}

/* 浅色模式：IRC 黑白风 */
body.light {
  --rc-bg:         #0d0d0d;
  --rc-bg2:        #111;
  --rc-bg3:        #111;
  --rc-border:     #333;
  --rc-border2:    #222;
  --rc-title-bg:   #111;
  --rc-conn-bg:    #0a0a0a;
  --rc-conn-color: #444;
  --rc-sys:        #444;
  --rc-time:       #444;
  --rc-nick-bot:   #ff9944;
  --rc-nick-usr:   #5599ff;
  --rc-msg-bot:    #cccccc;
  --rc-msg-usr:    #e8e8e8;
  --rc-input-bg:   #080808;
  --rc-prompt:     #555;
  --rc-cursor:     #ff9944;
  --rc-hint:       #333;
  --rc-hint-bg:    #0a0a0a;
  --rc-scan:       none;
}

/* ── 聊天室外壳 ── */
.retro-chat {
  background: var(--rc-bg);
  border: 2px solid var(--rc-border);
  border-radius: 3px;
  font-family: 'Courier New', Courier, monospace;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 24px rgba(0,0,0,.5);
  transition: border-color .3s, background .3s;
}

/* CRT 扫描线（暗色模式专用，浅色模式关闭） */
.retro-chat::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    var(--rc-scan) 2px,
    var(--rc-scan) 4px
  );
  pointer-events: none;
  z-index: 10;
}

/* 标题栏 */
.rc-titlebar {
  background: var(--rc-title-bg);
  border-bottom: 1px solid var(--rc-border);
  padding: 6px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.rc-title {
  font-size: 11px;
  font-weight: bold;
  color: var(--rc-nick-bot);
  letter-spacing: 0.5px;
}
.rc-online {
  font-size: 10px;
  color: #22c55e;
  display: flex;
  align-items: center;
  gap: 4px;
}
.rc-online::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: #22c55e;
  display: inline-block;
  animation: rc-pulse 2s ease-in-out infinite;
}
@keyframes rc-pulse {
  0%,100% { opacity: 1; }
  50%      { opacity: .4; }
}

/* 连接状态行 */
.rc-connbar {
  background: var(--rc-conn-bg);
  border-bottom: 1px solid var(--rc-border2);
  padding: 2px 12px;
  font-size: 9px;
  color: var(--rc-conn-color);
  letter-spacing: 0.3px;
  white-space: nowrap;
  overflow: hidden;
}

/* 消息区 */
.rc-messages {
  height: 200px;
  overflow-y: auto;
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--rc-bg);
}
.rc-messages::-webkit-scrollbar { width: 4px; }
.rc-messages::-webkit-scrollbar-track { background: transparent; }
.rc-messages::-webkit-scrollbar-thumb { background: var(--rc-border2); border-radius: 2px; }

.rc-line {
  font-size: 11.5px;
  line-height: 1.7;
  word-break: break-word;
  animation: rc-fadein .15s ease;
  display: flex;
  gap: 0;
  flex-wrap: wrap;
  align-items: baseline;
}
@keyframes rc-fadein { from{opacity:0} to{opacity:1} }

.rc-time    { color: var(--rc-time); font-size: 10px; margin-right: 5px; flex-shrink: 0; }
.rc-nick-bot { color: var(--rc-nick-bot); font-weight: bold; margin-right: 4px; flex-shrink: 0; }
.rc-nick-usr { color: var(--rc-nick-usr); font-weight: bold; margin-right: 4px; flex-shrink: 0; }
.rc-msg-bot  { color: var(--rc-msg-bot); }
.rc-msg-usr  { color: var(--rc-msg-usr); }
.rc-sys-line {
  color: var(--rc-sys);
  font-size: 10px;
  font-style: italic;
  width: 100%;
  text-align: center;
  padding: 2px 0;
}

/* 打字动画 */
.rc-typing-wrap { display: inline-flex; gap: 3px; align-items: center; padding: 2px 0; }
.rc-typing-wrap span {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--rc-nick-bot);
  opacity: 0.6;
  animation: rc-bounce .8s ease-in-out infinite;
}
.rc-typing-wrap span:nth-child(2) { animation-delay: .13s; }
.rc-typing-wrap span:nth-child(3) { animation-delay: .26s; }
@keyframes rc-bounce {
  0%,60%,100% { transform: translateY(0); opacity:.6; }
  30%          { transform: translateY(-4px); opacity:1; }
}

/* 输入行 */
.rc-input-row {
  border-top: 1px solid var(--rc-border2);
  display: flex;
  align-items: center;
  background: var(--rc-input-bg);
  flex-shrink: 0;
}
.rc-prompt-sym {
  color: var(--rc-prompt);
  font-size: 11px;
  padding: 0 6px 0 8px;
  flex-shrink: 0;
  font-weight: bold;
}
.rc-input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 7px 4px;
  color: var(--rc-msg-usr);
  font-family: 'Courier New', monospace;
  font-size: 11.5px;
  outline: none;
  caret-color: var(--rc-cursor);
}
.rc-input::placeholder { color: var(--rc-border2); }
.rc-send {
  background: transparent;
  border: none;
  border-left: 1px solid var(--rc-border2);
  color: var(--rc-nick-bot);
  font-size: 13px;
  padding: 7px 12px;
  cursor: pointer;
  font-family: monospace;
  transition: background .12s;
  flex-shrink: 0;
}
.rc-send:hover { background: var(--rc-title-bg); }
.rc-send:disabled { opacity: .3; cursor: not-allowed; }

/* 底部提示 */
.rc-hint {
  font-size: 9px;
  color: var(--rc-hint);
  text-align: center;
  padding: 4px 12px 5px;
  border-top: 1px solid var(--rc-border2);
  background: var(--rc-hint-bg);
  letter-spacing: 0.3px;
  flex-shrink: 0;
}

/* ── 响应式 ── */
@media (max-width: 860px) {
  .hero-inner { flex-direction: column; gap: 28px; }
  .hero-left-col, .hero-chat-col { width: 100%; max-width: 100%; }
  .rc-messages { height: 160px; }
}