* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #eef4f8;
  --color-card: #fff;
  --color-primary: #2a6f97;
  --color-accent: #014f86;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--color-bg);
  color: #1a2a33;
  line-height: 1.6;
  min-height: 100vh;
}

header {
  background: linear-gradient(135deg, #014f86, #2a6f97);
  color: #fff;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  position: sticky;
  top: 0;
  z-index: 100;
}

header h1 { font-size: 1.1rem; }
header nav a { color: #b8e0ff; margin-left: 12px; font-size: 0.9rem; text-decoration: none; }
header nav a:hover { text-decoration: underline; }
header nav .nav-btn {
  margin-left: 12px;
  padding: 4px 12px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 0.9rem;
  cursor: pointer;
  font-family: inherit;
}
header nav .nav-btn:hover { background: rgba(255, 255, 255, 0.22); }
.room-tag { background: rgba(255,255,255,0.2); padding: 4px 10px; border-radius: 6px; margin-right: 8px; }

main { max-width: 720px; margin: 0 auto; padding: 20px 14px 40px; }

.card {
  background: var(--color-card);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 16px rgba(1, 79, 134, 0.08);
  margin-bottom: 16px;
}

label { display: block; margin: 10px 0 6px; font-weight: 500; font-size: 0.9rem; }
input, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #c5d5e0;
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
}

.btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff !important;
  padding: 10px 18px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  text-decoration: none !important;
}

.btn:hover { background: var(--color-accent); }
.btn-outline {
  background: transparent;
  color: var(--color-primary) !important;
  border: 1px solid var(--color-primary);
}

.meta { color: #5a7a8a; font-size: 0.85rem; }
.alert { padding: 10px 12px; border-radius: 8px; margin-bottom: 12px; }
.alert-err { background: #fde8e8; color: #a33; }
.alert-ok { background: #e8f5e9; color: #2e6b3f; }

.chat-main { display: flex; flex-direction: column; height: calc(100vh - 56px); max-width: 720px; padding: 0; }
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  word-break: break-word;
}

.msg.mine { align-self: flex-end; background: #d4edfc; }
.msg .msg-meta { font-size: 0.75rem; color: #6a8a9a; margin-bottom: 4px; }
.msg img.msg-image { max-width: 100%; border-radius: 8px; margin-top: 6px; cursor: pointer; display: block; }
.msg img.msg-emote {
  width: 24px;
  height: 24px;
  vertical-align: middle;
  margin: 0 2px;
  display: inline-block;
}
.msg-text { white-space: pre-wrap; word-break: break-word; }

.chat-input-area {
  margin: 0;
  border-radius: 12px 12px 0 0;
  padding: 12px;
  flex-shrink: 0;
}

.input-row { display: flex; gap: 8px; align-items: flex-end; }
.input-row textarea { flex: 1; resize: none; min-height: 44px; }
.btn-icon {
  background: #e8f0f5;
  border: none;
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.emoji-panel {
  padding: 8px 0 12px;
  max-height: 200px;
  overflow-y: auto;
}
.emoji-panel.hidden { display: none; }
.emoji-section { margin-bottom: 10px; }
.emoji-section-label {
  display: block;
  font-size: 0.75rem;
  color: #6a8a9a;
  margin-bottom: 6px;
}
.emoji-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.emoji-btn {
  border: 1px solid #d0dde5;
  background: #f8fbfd;
  border-radius: 6px;
  cursor: pointer;
  padding: 4px 6px;
  line-height: 1.2;
}
.emoji-btn:hover { background: #e8f4fc; }
.emoji-btn.kaomoji {
  font-size: 0.85rem;
  font-family: monospace, sans-serif;
}
.emoji-btn.emote {
  padding: 2px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.admin-table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 0.9rem; }
.admin-table th, .admin-table td { padding: 10px 8px; text-align: left; border-bottom: 1px solid #e0e8ee; }
.delete-form label { margin-top: 12px; }
.delete-form .btn { margin-top: 16px; }
.admin-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.chat-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #1a2a33;
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 0.9rem;
  z-index: 200;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.chat-toast.show { opacity: 1; }

@media (max-width: 768px) {
  .msg { max-width: 92%; }
}