*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;background:#f5f6fa;color:#333;line-height:1.6}
a{color:#4a6cf7;text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:0 16px}

/* Header */
.site-header{background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.08);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;height:60px;gap:20px}
.logo{font-size:20px;font-weight:700;color:#4a6cf7;white-space:nowrap}
.nav{display:flex;gap:18px;flex:1;overflow-x:auto}
.nav a{color:#555;font-size:14px;white-space:nowrap}
.nav a:hover{color:#4a6cf7;text-decoration:none}
.user-area{display:flex;align-items:center;gap:12px;font-size:14px;white-space:nowrap}
.user-link{color:#333;font-weight:500}

/* Buttons */
.btn{display:inline-block;padding:8px 18px;border-radius:6px;border:1px solid #ddd;background:#fff;color:#333;font-size:14px;cursor:pointer;text-align:center}
.btn:hover{background:#f5f5f5;text-decoration:none}
.btn-primary{background:#4a6cf7;color:#fff;border-color:#4a6cf7}
.btn-primary:hover{background:#3a5ce7;color:#fff}
.btn-sm{padding:5px 12px;font-size:13px}
.btn-block{display:block;width:100%}

/* Layout */
.layout{display:flex;gap:20px;padding:20px 0}
.main-col{flex:1;min-width:0}
.side-col{width:280px;flex-shrink:0}

/* Widget */
.widget{background:#fff;border-radius:8px;padding:16px;margin-bottom:16px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.widget h3{font-size:15px;margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid #eee}
.cat-list{list-style:none}
.cat-list li{margin-bottom:6px}
.cat-list a{display:flex;justify-content:space-between;padding:6px 8px;border-radius:4px;color:#555;font-size:14px}
.cat-list a:hover,.cat-list a.active{background:#f0f3ff;color:#4a6cf7;text-decoration:none}
.cat-list .count{color:#999;font-size:12px}
.hot-list{list-style:none;counter-reset:rank}
.hot-list li{display:flex;align-items:center;gap:8px;padding:6px 0;border-bottom:1px solid #f5f5f5;font-size:14px}
.hot-list li:last-child{border-bottom:none}
.rank{width:20px;height:20px;display:flex;align-items:center;justify-content:center;border-radius:4px;font-size:12px;font-weight:700;color:#fff;background:#ccc;flex-shrink:0}
.rank-1{background:#ff4d4f}.rank-2{background:#ff7a45}.rank-3{background:#ffa940}
.hot-list a{color:#333;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.stats{display:flex;justify-content:space-around;text-align:center}
.stat-item strong{display:block;font-size:20px;color:#4a6cf7}
.stat-item span{font-size:12px;color:#999}

/* Post list */
.section-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.section-title h2{font-size:18px}
.post-list{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.post-item{display:flex;gap:12px;padding:14px 16px;border-bottom:1px solid #f5f5f5}
.post-item:last-child{border-bottom:none}
.post-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#4a6cf7,#7c3aed);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0}
.post-content{flex:1;min-width:0}
.post-title-row{display:flex;align-items:center;gap:8px;margin-bottom:4px;flex-wrap:wrap}
.post-title{font-size:15px;font-weight:500;color:#222}
.post-title:hover{color:#4a6cf7;text-decoration:none}
.tag{display:inline-block;padding:1px 8px;border-radius:3px;font-size:11px;background:#f0f3ff;color:#4a6cf7}
.tag-top{background:#fff1f0;color:#ff4d4f}
.tag-pending{background:#fff7e6;color:#fa8c16}
.post-meta{display:flex;gap:14px;font-size:12px;color:#999}
.empty{padding:40px;text-align:center;color:#999}
.cat-desc{color:#888;font-size:13px;margin-bottom:14px}

/* Post detail */
.breadcrumb{font-size:13px;color:#999;margin-bottom:14px}
.post-detail{background:#fff;border-radius:8px;padding:24px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.post-detail-title{font-size:22px;margin-bottom:12px}
.post-detail-meta{display:flex;gap:16px;font-size:13px;color:#999;padding-bottom:14px;border-bottom:1px solid #eee;margin-bottom:18px}
.post-body{font-size:15px;line-height:1.8;color:#333;word-break:break-word}

/* Comments */
.comment-section{background:#fff;border-radius:8px;padding:20px;margin-top:16px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.comment-section h3{font-size:16px;margin-bottom:14px}
.comment-form textarea{width:100%;padding:10px;border:1px solid #ddd;border-radius:6px;font-size:14px;resize:vertical;margin-bottom:10px}
.comment-list{margin-top:16px}
.comment-item{display:flex;gap:10px;padding:12px 0;border-bottom:1px solid #f5f5f5}
.comment-avatar{width:32px;height:32px;border-radius:50%;background:#e8ecff;color:#4a6cf7;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0}
.comment-body{flex:1}
.comment-meta{display:flex;gap:10px;font-size:12px;color:#999;margin-bottom:4px}
.comment-meta strong{color:#333}
.comment-text{font-size:14px;color:#444}
.login-tip{padding:14px;background:#f9f9f9;border-radius:6px;text-align:center;font-size:14px}

/* Author card */
.author-card{text-align:center}
.author-avatar-lg{width:60px;height:60px;border-radius:50%;background:linear-gradient(135deg,#4a6cf7,#7c3aed);color:#fff;display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:700;margin:0 auto 10px}
.author-name{font-weight:600;margin-bottom:4px}
.author-stats{font-size:12px;color:#999}

/* Forms */
.form-page{max-width:700px;margin:20px auto;background:#fff;padding:24px;border-radius:8px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.form-page.narrow{max-width:400px}
.form-page h2{margin-bottom:18px}
.form-group{margin-bottom:16px}
.form-group label{display:block;margin-bottom:6px;font-size:14px;font-weight:500}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:9px 12px;border:1px solid #ddd;border-radius:6px;font-size:14px}
.form-group textarea{resize:vertical}
.post-form .btn{margin-right:8px}
.auth-link{text-align:center;margin-top:14px;font-size:14px;color:#888}
.error{background:#fff1f0;color:#ff4d4f;padding:10px 14px;border-radius:6px;margin-bottom:14px;font-size:14px}
.flash{background:#f6ffed;color:#52c41a;padding:10px 14px;border-radius:6px;margin-bottom:14px;font-size:14px}

/* Profile */
.profile-header{display:flex;gap:16px;align-items:center;background:#fff;padding:20px;border-radius:8px;margin-bottom:16px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.profile-avatar{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,#4a6cf7,#7c3aed);color:#fff;display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700}
.profile-info h2{margin-bottom:4px}
.profile-info p{font-size:13px;color:#888}

/* Footer */
.site-footer{background:#fff;border-top:1px solid #eee;padding:20px 0;margin-top:30px;text-align:center;color:#999;font-size:13px}

/* Mobile */
@media(max-width:768px){
    .side-col{display:none}
    .header-inner{gap:10px}
    .nav{gap:12px}
    .post-detail{padding:16px}
    .post-detail-title{font-size:18px}
}