/* ============================================================
   placeholder.css —— 未开发章节占位页
   ============================================================ */

#placeholder {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at 50% 45%,
    rgba(8,8,14,0.96) 0%, rgba(1,1,3,0.99) 80%);
  z-index: 1400;
  padding: 2rem;
  overflow-y: auto;
}
#placeholder.open { display: flex; }

.ph-inner {
  max-width: 460px;
  text-align: center;
  animation: phIn 0.7s ease both;
}
@keyframes phIn {
  0%   { opacity: 0; transform: translateY(20px); filter: blur(6px); }
  100% { opacity: 1; transform: translateY(0);    filter: blur(0); }
}

/* 开发中标签 */
.ph-status {
  display: inline-block;
  padding: 0.35rem 1.1rem;
  font-size: 0.72rem;
  letter-spacing: 0.4em;
  color: #7a6a4a;
  border: 1px solid rgba(120,100,60,0.4);
  border-radius: 20px;
  margin-bottom: 2rem;
  background: rgba(20,16,8,0.5);
}

/* 章节名 */
.ph-name {
  font-size: clamp(1.8rem, 8vw, 2.8rem);
  letter-spacing: 0.4em;
  color: #b8b0a0;
  margin-bottom: 0.8rem;
}

/* 章节标题 */
.ph-title {
  font-size: clamp(1.1rem, 5vw, 1.6rem);
  letter-spacing: 0.5em;
  color: #8a7a5a;
  margin-bottom: 2.4rem;
  text-shadow: 0 0 20px rgba(140,120,70,0.3);
}

/* 主题 */
.ph-theme {
  font-size: clamp(0.85rem, 3.6vw, 1rem);
  letter-spacing: 0.25em;
  color: #6a6a76;
  margin-bottom: 0.8rem;
}

/* 玩法预告 */
.ph-hint {
  font-size: clamp(0.78rem, 3.3vw, 0.9rem);
  letter-spacing: 0.18em;
  color: #5a5a66;
  margin-bottom: 2.2rem;
}

/* 预告词 */
.ph-teaser {
  font-size: clamp(0.9rem, 3.9vw, 1.05rem);
  line-height: 2;
  color: #9a9088;
  letter-spacing: 0.08em;
  margin-bottom: 2rem;
  padding: 1.4rem 1rem;
  border-top: 1px solid rgba(120,100,60,0.18);
  border-bottom: 1px solid rgba(120,100,60,0.18);
  font-style: italic;
}

/* 警告(第九章) */
.ph-warning {
  font-size: clamp(0.8rem, 3.5vw, 0.95rem);
  letter-spacing: 0.2em;
  color: #a05050;
  margin-bottom: 2rem;
  padding: 0.8rem;
  border: 1px solid rgba(160,60,60,0.3);
  border-radius: 6px;
  background: rgba(40,10,10,0.3);
  animation: phWarn 2.4s ease-in-out infinite;
}
@keyframes phWarn {
  0%, 100% { border-color: rgba(160,60,60,0.25); }
  50%      { border-color: rgba(200,80,80,0.6); }
}

/* 返回按钮 */
.ph-back {
  margin-top: 1rem;
  padding: 0.85rem 2.4rem;
  font-family: inherit;
  font-size: 0.9rem;
  letter-spacing: 0.3em;
  color: #cfcfd6;
  background: rgba(20,20,30,0.5);
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: 8px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  -webkit-backdrop-filter: blur(18px) saturate(1.7);
  backdrop-filter: blur(18px) saturate(1.7);
  transition: all 0.25s ease;
}
.ph-back:hover, .ph-back:active {
  color: #fff;
  border-color: rgba(184,155,94,0.8);
  background: rgba(184,155,94,0.2);
}