*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#6366f1;--primary-dark:#4f46e5;--bg:#f8fafc;--card:#fff;
  --text:#1e293b;--muted:#64748b;--border:#e2e8f0;--radius:8px;
  --shadow:0 1px 3px rgba(0,0,0,.08);
}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:0 16px}

.site-header{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;gap:16px;padding:12px 16px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.2rem;color:var(--text);text-decoration:none}
.logo-icon{font-size:1.5rem}
.search-form{display:flex;flex:1;max-width:360px}
.search-form input{flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius) 0 0 var(--radius);font-size:.9rem}
.search-form button{padding:8px 16px;background:var(--primary);color:#fff;border:none;border-radius:0 var(--radius) var(--radius) 0;cursor:pointer}
.header-nav{display:flex;align-items:center;gap:12px;margin-left:auto}
.user-link{display:flex;align-items:center;gap:6px;color:var(--text)}

.layout{display:grid;grid-template-columns:240px 1fr;gap:24px;padding:24px 16px;flex:1}
@media(max-width:768px){.layout{grid-template-columns:1fr}.sidebar{order:2}}

.sidebar-block{background:var(--card);border-radius:var(--radius);padding:16px;margin-bottom:16px;box-shadow:var(--shadow)}
.sidebar-block h3{font-size:.85rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:12px}
.cat-list{list-style:none}
.cat-list li{margin-bottom:4px}
.cat-list a{display:flex;justify-content:space-between;padding:6px 8px;border-radius:4px;color:var(--text);font-size:.9rem}
.cat-list a:hover{background:var(--bg);text-decoration:none}
.badge{background:var(--bg);color:var(--muted);font-size:.75rem;padding:2px 8px;border-radius:10px}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);text-align:center;gap:8px}
.stats-grid strong{display:block;font-size:1.3rem;color:var(--primary)}
.stats-grid span{font-size:.75rem;color:var(--muted)}

.main-content{min-width:0}
.hero{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;padding:32px;border-radius:var(--radius);margin-bottom:24px}
.hero h1{font-size:1.8rem;margin-bottom:8px}
.hero p{opacity:.9;font-size:1rem}

.section{margin-bottom:24px}
.section-title{font-size:1.1rem;margin-bottom:16px;padding-bottom:8px;border-bottom:2px solid var(--primary)}
.page-header{margin-bottom:20px}
.page-header h1{font-size:1.5rem;margin-bottom:4px}
.page-header p{color:var(--muted)}

.topic-list{display:flex;flex-direction:column;gap:12px}
.topic-item{background:var(--card);padding:16px;border-radius:var(--radius);box-shadow:var(--shadow);transition:box-shadow .2s}
.topic-item:hover{box-shadow:0 4px 12px rgba(0,0,0,.1)}
.topic-item.pinned{border-left:3px solid var(--primary)}
.topic-meta{font-size:.85rem;color:var(--muted);margin-bottom:6px;display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.topic-item h3{font-size:1.05rem;margin-bottom:6px}
.topic-item h3 a{color:var(--text)}
.topic-excerpt{color:var(--muted);font-size:.9rem;margin-bottom:8px}
.topic-stats{font-size:.8rem;color:var(--muted);display:flex;gap:16px}
.cat-tag{background:#eef2ff;color:var(--primary);padding:1px 8px;border-radius:4px;font-size:.8rem}
.pin-badge{background:#fef3c7;color:#d97706;padding:1px 6px;border-radius:4px;font-size:.75rem}

.avatar{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;color:#fff;font-weight:600;font-size:.85rem;flex-shrink:0}
.avatar.sm{width:24px;height:24px;font-size:.7rem}
.avatar.lg{width:64px;height:64px;font-size:1.5rem}

.post-card{background:var(--card);border-radius:var(--radius);padding:20px;margin-bottom:12px;box-shadow:var(--shadow)}
.post-card.op{border-left:3px solid var(--primary)}
.post-header{display:flex;align-items:flex-start;gap:12px;margin-bottom:12px}
.post-header .author{font-weight:600;color:var(--text);display:block}
.post-header .bio{display:block;font-size:.8rem;color:var(--muted)}
.post-header time{font-size:.8rem;color:var(--muted)}
.floor-tag,.floor-num{margin-left:auto;font-size:.8rem;color:var(--muted);background:var(--bg);padding:2px 8px;border-radius:4px}
.post-body{white-space:pre-wrap;line-height:1.8;font-size:.95rem}
.post-footer{margin-top:12px;font-size:.85rem;color:var(--muted)}
.breadcrumb{font-size:.85rem;color:var(--muted);margin-bottom:12px}
.reply-title{font-size:1.1rem;margin:24px 0 12px}

.reply-form{background:var(--card);padding:20px;border-radius:var(--radius);box-shadow:var(--shadow);margin-top:16px}
.reply-form h3{margin-bottom:12px;font-size:1rem}
.reply-form textarea{width:100%;padding:12px;border:1px solid var(--border);border-radius:var(--radius);font-family:inherit;font-size:.95rem;resize:vertical;margin-bottom:12px}
.login-hint{text-align:center;padding:20px;color:var(--muted)}

.form-section{background:var(--card);padding:24px;border-radius:var(--radius);box-shadow:var(--shadow);max-width:600px}
.form-section h1{margin-bottom:16px}
.form-section label{display:block;margin-bottom:16px;font-weight:500;font-size:.9rem}
.form-section input,.form-section select,.form-section textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:.95rem;margin-top:4px;font-family:inherit}
.hint{color:var(--muted);font-size:.9rem;margin-bottom:16px}
.auth-section{max-width:440px;margin:0 auto}
.auth-form .auth-row{display:flex;justify-content:flex-end;margin:-8px 0 16px}
.auth-link{font-size:.85rem;color:var(--primary)}
.auth-footer{text-align:center;margin-top:20px;font-size:.9rem;color:var(--muted)}
.auth-footer a{color:var(--primary);font-weight:500}
.checkbox-label{display:flex!important;align-items:flex-start;gap:8px;font-weight:400!important;font-size:.85rem!important}
.checkbox-label input{width:auto;margin-top:3px}
.btn-block{display:block;width:100%;text-align:center;padding:12px 20px}

.btn{display:inline-block;padding:8px 20px;border-radius:var(--radius);font-size:.9rem;cursor:pointer;border:none;text-decoration:none}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);text-decoration:none}
.btn-outline{background:transparent;color:var(--primary);border:1px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff;text-decoration:none}

.alert{padding:12px 16px;border-radius:var(--radius);margin-bottom:16px;font-size:.9rem}
.alert-success{background:#dcfce7;color:#166534}
.alert-danger{background:#fee2e2;color:#991b1b}
.alert-warning{background:#fef3c7;color:#92400e}
.alert-info{background:#dbeafe;color:#1e40af}

.profile-header{display:flex;align-items:center;gap:20px;margin-bottom:24px;padding:24px;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow)}
.profile-bio{color:var(--muted);margin-top:4px}
.profile-meta{font-size:.85rem;color:var(--muted);margin-top:4px}
.compact .topic-item,.reply-item{padding:12px}

.static-page{background:var(--card);padding:32px;border-radius:var(--radius);box-shadow:var(--shadow)}
.static-page h1{margin-bottom:16px}
.static-page h2{margin:20px 0 8px;font-size:1.1rem}
.static-page p,.static-page li{margin-bottom:8px;color:var(--text)}
.static-page ul{padding-left:24px}

.empty{color:var(--muted);text-align:center;padding:32px}
.site-footer{background:var(--card);border-top:1px solid var(--border);padding:20px;text-align:center;font-size:.85rem;color:var(--muted);margin-top:auto}
.footer-links{margin-top:4px}
.footer-contact{margin-top:6px;font-size:.82rem}
.footer-contact a{color:var(--primary)}

.contact-info{background:#f8fafc;padding:16px 20px;border-radius:var(--radius);margin-bottom:24px;font-size:.9rem;border:1px solid var(--border)}
.contact-info p{margin-bottom:6px}
.form-subtitle{font-size:1rem;margin:0 0 12px}
.required{color:#ef4444}
.post-footer{display:flex;justify-content:space-between;align-items:center;margin-top:12px;padding-top:8px;font-size:.85rem;color:var(--muted);border-top:1px solid var(--border)}
.report-link{color:var(--muted);font-size:.85rem}
.report-link:hover{color:#ef4444;text-decoration:none}