/* ==================== CSS变量 ==================== */
:root {
    --primary: #6C5CE7; --primary-light: #A29BFE; --success: #00B894; --danger: #e74c3c;
    --bg: #f0f2f5; --card-bg: rgba(255,255,255,0.72); --text: #2d3436; --text-secondary: #636e72;
    --radius: 16px; --shadow: 0 8px 32px rgba(0,0,0,0.06);
    --glass-border: 1px solid rgba(255,255,255,0.3); --blur: blur(20px);
    -webkit-tap-highlight-color: transparent;
}
*{margin:0;padding:0;box-sizing:border-box;}
body{
    font-family: -apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
    background: linear-gradient(135deg, #e8ecf1 0%, #f5f7fa 50%, #e8f0fe 100%) fixed;
    color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased;
}
a{color:var(--primary);text-decoration:none;}

/* ==================== 顶部栏 ==================== */
.top-bar{position:sticky;top:0;z-index:100;background:rgba(255,255,255,0.65);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border-bottom:1px solid rgba(255,255,255,0.4);padding:12px 16px;padding-top:max(12px,env(safe-area-inset-top));}
.top-bar-inner{display:flex;align-items:center;gap:12px;max-width:1200px;margin:0 auto;}
.logo-text{font-size:20px;font-weight:700;white-space:nowrap;background:linear-gradient(135deg,#6C5CE7,#e84393);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.back-btn{font-size:16px;color:var(--primary);font-weight:500;white-space:nowrap;}
.top-title{flex:1;text-align:center;font-weight:600;font-size:16px;}
.search-box{flex:1;display:flex;background:rgba(255,255,255,0.9);border-radius:24px;overflow:hidden;border:1px solid rgba(0,0,0,0.08);box-shadow:0 2px 8px rgba(0,0,0,0.04);}
.search-box input{flex:1;border:none;padding:10px 16px;font-size:15px;background:transparent;outline:none;min-width:0;}
.search-box button{border:none;background:var(--primary);color:#fff;padding:10px 16px;cursor:pointer;font-size:16px;}

/* ==================== 毛玻璃卡片 ==================== */
.glass-card{background:var(--card-bg);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border-radius:var(--radius);border:var(--glass-border);box-shadow:var(--shadow);transition:all 0.3s ease;}
.glass-card:active{transform:scale(0.98);box-shadow:0 4px 16px rgba(0,0,0,0.06);}
.glass-nav{background:rgba(255,255,255,0.6);backdrop-filter:blur(28px);-webkit-backdrop-filter:blur(28px);border-top:1px solid rgba(255,255,255,0.5);}
.bottom-nav{position:fixed;bottom:0;left:0;right:0;display:flex;justify-content:space-around;padding:8px 0;padding-bottom:max(8px,env(safe-area-inset-bottom));z-index:100;}
.nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 20px;border-radius:12px;transition:all 0.2s;color:var(--text-secondary);text-decoration:none;}
.nav-item.active{color:var(--primary);}
.nav-item.active .nav-icon{transform:scale(1.15);}
.nav-icon{font-size:24px;transition:transform 0.2s;}
.nav-label{font-size:11px;font-weight:500;}

/* ==================== 广告轮播 ==================== */
.ad-carousel{position:relative;width:calc(100% - 32px);max-width:1200px;margin:16px auto;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);aspect-ratio:16/7;max-height:220px;background:linear-gradient(135deg,#667eea,#764ba2);}
.ad-track{display:flex;transition:transform 0.5s cubic-bezier(0.25,0.46,0.45,0.94);height:100%;}
.ad-slide{flex:0 0 100%;position:relative;height:100%;}
.ad-slide a{display:block;width:100%;height:100%;position:relative;}
.ad-slide img{width:100%;height:100%;object-fit:cover;}
.ad-label{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,rgba(0,0,0,0.7));color:#fff;padding:24px 16px 12px;font-size:15px;font-weight:600;text-align:center;letter-spacing:1px;}
.placeholder-ad{display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff;font-weight:600;}
.ad-dots{position:absolute;bottom:10px;right:16px;display:flex;gap:6px;}
.ad-dot{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,0.5);transition:all 0.3s;cursor:pointer;}
.ad-dot.active{background:#fff;width:24px;border-radius:4px;}

/* ==================== 分类标签 ==================== */
.category-tabs{display:flex;gap:8px;padding:4px 16px;overflow-x:auto;scrollbar-width:none;max-width:1200px;margin:0 auto;}
.category-tabs::-webkit-scrollbar{display:none;}
.cat-tab{flex-shrink:0;padding:8px 20px;border-radius:20px;background:rgba(255,255,255,0.7);backdrop-filter:blur(10px);font-size:14px;font-weight:500;color:var(--text-secondary);border:1px solid rgba(255,255,255,0.4);transition:all 0.25s;white-space:nowrap;}
.cat-tab.active{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 4px 15px rgba(108,92,231,0.35);}

/* ==================== 帖子网格布局（核心） ==================== */
.post-container{max-width:1200px;margin:16px auto;padding:0 16px;}
.post-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(260px, 1fr));gap:16px;}
.post-list-single{display:flex;flex-direction:column;gap:12px;}

.post-card{cursor:pointer;overflow:hidden;border-radius:var(--radius);}
.post-card-row{display:flex;gap:14px;padding:14px;}
.post-card-row .post-card-cover{flex-shrink:0;width:120px;height:90px;border-radius:12px;overflow:hidden;}
.post-card-row .post-card-body{flex:1;}

/* grid模式下的卡片 */
.post-grid .post-card{border-radius:var(--radius);overflow:hidden;}
.post-grid .post-card-cover{width:100%;aspect-ratio:1/1;overflow:hidden;position:relative;background:#e8ecf1;}
.post-grid .post-card-cover img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}
.post-grid .post-card:hover .post-card-cover img{transform:scale(1.06);}
.post-grid .post-card-body{padding:12px 14px;}

.cover-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:48px;background:linear-gradient(135deg,#e8ecf1,#dce3ea);color:#b0b8c1;}
.video-badge{position:absolute;top:10px;right:10px;background:rgba(0,0,0,0.7);color:#fff;padding:3px 10px;border-radius:12px;font-size:12px;font-weight:500;}

.post-card-title{font-size:15px;font-weight:600;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;color:var(--text);margin-bottom:8px;}
.post-card-excerpt{font-size:13px;color:var(--text-secondary);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:8px;}
.post-card-meta{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:12px;color:var(--text-secondary);}

.meta-author{color:var(--text-secondary);}
.meta-tag{padding:2px 10px;border-radius:12px;background:rgba(108,92,231,0.12);color:var(--primary);font-weight:500;font-size:11px;}
.meta-stats{font-size:11px;color:#999;}

/* ==================== 帖子详情 ==================== */
.post-detail{max-width:800px;margin:20px auto;padding:0 16px;}
.detail-title{font-size:24px;font-weight:700;line-height:1.4;margin-bottom:12px;}
.detail-meta{display:flex;flex-wrap:wrap;gap:10px;font-size:13px;color:var(--text-secondary);margin-bottom:20px;align-items:center;}
.detail-cover{border-radius:var(--radius);overflow:hidden;margin-bottom:20px;}
.detail-cover img,.detail-video video{width:100%;max-height:500px;object-fit:cover;border-radius:var(--radius);}
.detail-content{font-size:16px;line-height:1.8;color:var(--text);white-space:pre-wrap;word-break:break-word;}
.detail-images{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px;margin-top:20px;}
.detail-image-item{border-radius:12px;overflow:hidden;cursor:pointer;}
.detail-image-item img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform 0.3s;}
.detail-image-item img.zoomed{position:fixed;top:0;left:0;width:100vw;height:100vh;object-fit:contain;z-index:9999;background:rgba(0,0,0,0.9);border-radius:0;}

/* ==================== 评论 ==================== */
.comments-section{max-width:800px;margin:20px auto;padding:0 16px;}
.section-title{font-size:18px;font-weight:600;margin-bottom:16px;}
.comment-form{padding:16px;margin-bottom:20px;}
.comment-form textarea{width:100%;border:1px solid rgba(0,0,0,0.1);border-radius:12px;padding:12px;font-size:15px;resize:vertical;background:rgba(255,255,255,0.6);outline:none;font-family:inherit;transition:border 0.3s;}
.comment-form textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(108,92,231,0.1);}
.comment-item{padding:14px;margin-bottom:10px;}
.comment-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;}
.comment-author{display:flex;align-items:center;gap:8px;font-weight:500;font-size:14px;}
.avatar-placeholder{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--primary-light),var(--primary));color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;}
.comment-time{font-size:12px;color:var(--text-secondary);}
.comment-content{font-size:14px;line-height:1.6;color:var(--text);}

/* ==================== 按钮 ==================== */
.btn-primary{display:inline-block;padding:10px 24px;background:var(--primary);color:#fff;border:none;border-radius:24px;font-size:15px;font-weight:600;cursor:pointer;transition:all 0.3s;margin-top:10px;}
.btn-primary:active{transform:scale(0.96);opacity:0.9;}
.btn-secondary{display:inline-block;padding:10px 24px;background:rgba(255,255,255,0.6);backdrop-filter:blur(10px);color:var(--text);border:1px solid rgba(0,0,0,0.1);border-radius:24px;font-size:15px;font-weight:500;cursor:pointer;}
.btn-sm{padding:6px 14px;border-radius:16px;font-size:13px;background:rgba(255,255,255,0.7);color:var(--text);border:1px solid rgba(0,0,0,0.08);}
.btn-xs{padding:4px 10px;border-radius:12px;font-size:12px;background:rgba(108,92,231,0.1);color:var(--primary);display:inline-block;margin:2px;}
.btn-danger{background:rgba(231,76,60,0.12)!important;color:var(--danger)!important;}
.btn-success{background:rgba(0,184,148,0.12)!important;color:var(--success)!important;}
.btn-lg{padding:12px 32px;font-size:16px;}

/* ==================== 空状态/分页 ==================== */
.empty-state{text-align:center;padding:60px 20px;color:var(--text-secondary);grid-column:1/-1;}
.empty-icon{font-size:60px;display:block;margin-bottom:12px;}
.pagination{display:flex;justify-content:center;align-items:center;gap:16px;padding:20px;}
.page-btn{padding:10px 20px;background:var(--card-bg);backdrop-filter:var(--blur);border-radius:24px;font-size:14px;font-weight:500;color:var(--primary);border:var(--glass-border);}
.page-info{font-size:14px;color:var(--text-secondary);font-weight:500;}

/* ==================== 分类页 ==================== */
.categories-page{max-width:800px;margin:20px auto;padding:0 16px;}
.category-card{display:flex;align-items:center;gap:14px;padding:18px;margin-bottom:10px;text-decoration:none;color:var(--text);}
.cat-icon{font-size:36px;width:56px;height:56px;display:flex;align-items:center;justify-content:center;border-radius:16px;background:rgba(108,92,231,0.08);}
.cat-info{flex:1;}.cat-info h3{font-size:16px;font-weight:600;margin-bottom:4px;}
.cat-count{font-size:13px;color:var(--text-secondary);}
.cat-arrow{font-size:24px;color:var(--text-secondary);opacity:0.5;}

/* ==================== 个人中心 ==================== */
.profile-page{max-width:600px;margin:20px auto;padding:0 16px;}
.profile-card{text-align:center;padding:30px 20px;margin-bottom:16px;}
.avatar-large{display:inline-flex;width:80px;height:80px;border-radius:50%;background:linear-gradient(135deg,#a29bfe,#6c5ce7);color:#fff;align-items:center;justify-content:center;font-size:32px;font-weight:700;box-shadow:0 6px 20px rgba(108,92,231,0.3);}
.profile-name{font-size:22px;font-weight:600;margin:8px 0 4px;}
.profile-role{font-size:14px;color:var(--text-secondary);}
.menu-item{display:flex;align-items:center;gap:14px;padding:16px 18px;margin-bottom:8px;text-decoration:none;color:var(--text);font-size:15px;font-weight:500;}
.menu-icon{font-size:22px;}

/* 登录注册 */
.auth-tabs{display:flex;gap:0;margin-bottom:0;}
.auth-tab{flex:1;padding:12px;border:none;background:rgba(255,255,255,0.4);font-size:15px;font-weight:600;cursor:pointer;color:var(--text-secondary);border-radius:12px 12px 0 0;transition:all 0.2s;}
.auth-tab.active{background:var(--card-bg);backdrop-filter:var(--blur);color:var(--primary);}
.auth-form{padding:20px;border-radius:0 0 var(--radius) var(--radius);}
.auth-form h3{text-align:center;margin-bottom:16px;}
.auth-form input{width:100%;padding:12px 16px;border:1px solid rgba(0,0,0,0.1);border-radius:12px;font-size:15px;margin-bottom:12px;background:rgba(255,255,255,0.6);outline:none;}
.auth-form input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(108,92,231,0.1);}
.form-group{margin-bottom:0;}
.alert{padding:10px 14px;border-radius:8px;margin-bottom:12px;font-size:13px;}
.alert-error{background:rgba(231,76,60,0.1);color:#e74c3c;}

/* 响应式 */
@media(max-width:768px){
    .post-grid{grid-template-columns:repeat(2,1fr);gap:10px;}
    .post-grid .post-card-body{padding:8px 10px;}
    .post-card-title{font-size:14px;}
}
@media(max-width:400px){
    .post-grid{grid-template-columns:1fr 1fr;gap:8px;}
    .detail-title{font-size:20px;}
}

/* 收藏网格 */
.favorites-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(260px, 1fr));gap:16px;}
.favorites-grid .post-card{border-radius:var(--radius);overflow:hidden;}
.favorites-grid .post-card-cover{width:100%;aspect-ratio:1/1;overflow:hidden;position:relative;background:#e8ecf1;}
.favorites-grid .post-card-cover img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}
.favorites-grid .post-card:hover .post-card-cover img{transform:scale(1.06);}
.favorites-grid .post-card-body{padding:12px 14px;}
@media(max-width:768px){
    .favorites-grid{grid-template-columns:repeat(2,1fr);gap:10px;}
    .favorites-grid .post-card-body{padding:8px 10px;}
}
@media(max-width:400px){
    .favorites-grid{grid-template-columns:1fr 1fr;gap:8px;}
}

/* 图片灯箱 */
.lightbox{position:fixed;top:0;left:0;width:100vw;height:100vh;background:rgba(0,0,0,0.92);z-index:9999;display:none;align-items:center;justify-content:center;}
.lightbox img{max-width:90vw;max-height:85vh;object-fit:contain;border-radius:8px;user-select:none;-webkit-user-select:none;}
.lightbox-close{position:absolute;top:16px;right:24px;font-size:40px;color:#fff;cursor:pointer;z-index:10;line-height:1;}
.lightbox-prev,.lightbox-next{position:absolute;top:50%;transform:translateY(-50%);font-size:48px;color:#fff;cursor:pointer;z-index:10;padding:20px;user-select:none;-webkit-user-select:none;}
.lightbox-prev{left:8px;}.lightbox-next{right:8px;}
.lightbox-counter{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);color:#fff;font-size:14px;background:rgba(0,0,0,0.5);padding:6px 18px;border-radius:20px;}

/* 排版标签样式 */
.content-h2{font-size:22px;font-weight:700;text-align:center;margin:20px 0 14px;color:#2d3436;line-height:1.4;}
.content-h3{font-size:18px;font-weight:600;margin:16px 0 10px;padding-left:12px;border-left:3px solid #6C5CE7;color:#2d3436;line-height:1.4;}
.content-divider{border:none;height:1px;background:linear-gradient(90deg,transparent,#dce0e8,transparent);margin:20px 0;}
.content-quote{background:#f8f9fc;border-left:4px solid #6C5CE7;padding:14px 18px;margin:14px 0;border-radius:0 10px 10px 0;color:#555;line-height:1.7;font-style:italic;}
.content-quote p{margin:0;}
.reply-locked{backdrop-filter:blur(10px);}

/* 弹窗广告 */
.popup-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background:rgba(0,0,0,0.55);backdrop-filter:blur(6px);z-index:10000;display:flex;align-items:center;justify-content:center;animation:fadeIn .3s ease;}
.popup-card{background:#fff;border-radius:18px;box-shadow:0 20px 60px rgba(0,0,0,0.25);max-width:340px;width:85%;overflow:hidden;position:relative;animation:scaleIn .3s ease;}
.popup-card img{width:100%;max-height:400px;object-fit:contain;display:block;background:#f0f0f0;}
.popup-card .popup-body{padding:16px 20px;text-align:center;}
.popup-card .popup-body h3{font-size:18px;font-weight:700;margin-bottom:12px;color:#2d3436;}
.popup-card .popup-close{position:absolute;top:12px;right:14px;width:30px;height:30px;background:rgba(0,0,0,0.5);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;cursor:pointer;z-index:5;border:none;}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes scaleIn{from{transform:scale(0.85);opacity:0}to{transform:scale(1);opacity:1}}

/* 收藏按钮 */
.fav-btn{display:inline-flex;align-items:center;gap:4px;padding:4px 14px;background:rgba(255,255,255,0.6);border:1px solid rgba(0,0,0,0.1);border-radius:20px;cursor:pointer;font-size:14px;color:var(--text-secondary);transition:all 0.2s;}
.fav-btn:hover{background:rgba(240,192,64,0.15);border-color:#f0c040;color:#d4a017;}
.fav-btn #favIcon{font-size:18px;transition:color 0.2s;}

::selection{background:rgba(108,92,231,0.2);}