*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
body{background:#000;color:#eee;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;min-height:100vh;padding-bottom:70px}

.top-bar{position:sticky;top:0;z-index:50;background:rgba(0,0,0,.9);padding:12px 16px;display:flex;align-items:center;gap:12px;backdrop-filter:blur(10px);border-bottom:1px solid #222}
.back-btn{color:#fff;font-size:20px;cursor:pointer;background:none;border:none}
.back-btn a{color:#fff;text-decoration:none}
.top-bar .title{font-size:16px;font-weight:600;color:#fff}

/* 话题列表 */
.topic-list{padding:12px 16px}
.topic-card{display:flex;align-items:center;padding:14px 0;border-bottom:1px solid #222;cursor:pointer;gap:12px;transition:.2s}
.topic-card:hover{background:rgba(255,255,255,.02)}
.topic-icon{width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,#FE2C55,#8338EC);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}
.topic-info{flex:1}
.topic-name{font-size:15px;color:#fff;font-weight:600}
.topic-desc{font-size:12px;color:#888;margin-top:2px}
.topic-stats{font-size:12px;color:#555;text-align:right}

/* 话题详情 - 帖子网格 */
.topic-detail{display:none}
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;padding:2px}
.pg-item{aspect-ratio:3/4;overflow:hidden;position:relative;cursor:pointer;background:#1a1a1a}
.pg-item img{width:100%;height:100%;object-fit:cover}
.pg-item .pg-overlay{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,rgba(0,0,0,.7));padding:6px 8px}
.pg-overlay .pg-stats{font-size:11px;color:#fff;display:flex;gap:8px}
/* 小图加载占位 */
.tp-img-wrap{position:absolute;top:0;left:0;width:100%;height:100%;background:#1a1a1a}
.tp-img-spinner{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:20px;height:20px;border:2px solid rgba(255,255,255,.12);border-top-color:#FE2C55;border-radius:50%;animation:tpSpin .7s linear infinite;z-index:1}
@keyframes tpSpin{to{transform:translate(-50%,-50%) rotate(360deg)}}
.tp-img-wrap img{width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .35s;z-index:2;position:relative}
.tp-img-wrap img.loaded{opacity:1}
.tp-img-error{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;padding:6px;z-index:2}
.tp-img-error .tp-err-text{font-size:10px;color:#fff;line-height:1.3;text-align:center;word-break:break-word;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.grad-0{background:linear-gradient(135deg,#FE2C55,#FF6B6B)}
.grad-1{background:linear-gradient(135deg,#8338EC,#3A86FF)}
.grad-2{background:linear-gradient(135deg,#FFBE0B,#FF9800)}
.grad-3{background:linear-gradient(135deg,#06D6A0,#00B4D8)}
.grad-4{background:linear-gradient(135deg,#FF006E,#FB5607)}
.grad-5{background:linear-gradient(135deg,#3A86FF,#00F5D4)}
.pg-item.noimg{display:flex;align-items:center;justify-content:center;padding:8px}
.pg-item.noimg .pg-text{font-size:11px;color:#fff;line-height:1.4;display:-webkit-box;-webkit-line-clamp:5;-webkit-box-orient:vertical;overflow:hidden;text-align:center}
.empty-state{text-align:center;color:#666;padding:60px 20px;grid-column:1/-1}

.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:rgba(0,0,0,.9);display:flex;justify-content:space-around;padding:8px 0 env(safe-area-inset-bottom,0);border-top:1px solid rgba(255,255,255,.1);z-index:100}
.bottom-nav .nav-item{display:flex;flex-direction:column;align-items:center;gap:3px;color:#999;font-size:10px;cursor:pointer;text-decoration:none}
.bottom-nav .nav-item .nav-icon{font-size:22px}
.bottom-nav .nav-item.active{color:#FE2C55}
.bottom-nav .nav-item.plus .nav-icon{background:#FE2C55;color:#fff;width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:20px}
.nav-badge{position:absolute;top:-6px;right:-12px;background:#FE2C55;color:#fff;font-size:10px;min-width:18px;height:18px;line-height:18px;text-align:center;border-radius:9px;padding:0 5px;font-weight:600;border:1.5px solid #000}