/* ========================================
   GotHelp 全局样式
   主色调：暖橙 #E8630C
   断点：768px（平板）/ 480px（手机）
   ======================================== */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--primary:#E8630C;--primary-hover:#D4530A;--bg:#FFF8F5;--card:#fff;--text:#333;--text-light:#888;--border:#E8E0DC;--radius:10px;--shadow:0 2px 8px rgba(0,0,0,0.06)}
body{font-family:-apple-system,Segoe UI,Roboto,Noto Sans SC,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-hover)}

/* ===== Header ===== */
.header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header-inner{max-width:800px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:10px}
.logo{font-size:20px;font-weight:700;color:var(--text);white-space:nowrap;flex-shrink:0}
.header-search{flex:1;max-width:480px;display:flex;gap:4px;min-width:0;margin:0 auto}
.header-search input{flex:1;padding:8px 16px;border:1px solid var(--border);border-radius:20px;font-size:14px;outline:none;min-width:0}
.header-search input:focus{border-color:var(--primary)}
.header-search button{padding:8px 16px;background:var(--primary);color:#fff;border:none;border-radius:20px;cursor:pointer;font-size:14px;white-space:nowrap}
.btn-publish{padding:8px 18px;background:var(--primary);color:#fff;border-radius:20px;font-size:14px;font-weight:600;white-space:nowrap;flex-shrink:0}
.btn-publish:hover{background:var(--primary-hover);color:#fff}
.btn-back{font-size:14px;color:var(--text-light);margin-left:auto;white-space:nowrap;flex-shrink:0}
.lang-switch{position:relative;flex-shrink:0}
.lang-switch-btn{background:none;border:1px solid var(--border);border-radius:20px;padding:4px 10px;font-size:12px;cursor:pointer;display:flex;align-items:center;gap:4px;white-space:nowrap}
.lang-switch-btn:hover{border-color:var(--primary)}
.lang-switch ul{display:none;position:absolute;right:0;top:100%;background:#fff;border:1px solid var(--border);border-radius:8px;list-style:none;padding:4px;margin-top:4px;min-width:140px;box-shadow:0 4px 12px rgba(0,0,0,0.1);z-index:200}
.lang-switch ul.show{display:block}
.lang-switch li{padding:6px 12px;cursor:pointer;font-size:13px;border-radius:4px;white-space:nowrap}
.lang-switch li:hover{background:var(--bg)}
.lang-switch li.active{font-weight:600;color:var(--primary);background:#FFF3ED}

/* ===== Layout ===== */
.container{max-width:1100px;margin:0 auto;padding:20px 16px;flex:1}
.container.narrow{max-width:680px}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#FFF3ED 0%,#FFF8F5 100%);border:1px solid var(--border);border-radius:16px;padding:40px 32px;margin-bottom:28px;text-align:center}
.hero h1{font-size:28px;margin-bottom:8px;color:var(--text)}
.hero p{font-size:16px;color:var(--text-light);margin-bottom:20px}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn-lg{padding:12px 28px;font-size:16px}
.btn-outline{display:inline-block;padding:12px 28px;border:2px solid var(--primary);color:var(--primary);border-radius:20px;font-size:16px;font-weight:600;text-align:center;background:transparent}
.btn-outline:hover{background:var(--primary);color:#fff}

/* ===== Section ===== */
.section{margin-bottom:28px}
.section h2{font-size:18px;margin-bottom:14px;color:var(--text)}
.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.section-header h2{margin-bottom:0}

/* ===== Categories ===== */
.categories{display:grid;grid-template-columns:repeat(5,minmax(100px,1fr));gap:12px;margin-bottom:30px}
.category-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 8px;text-align:center;transition:box-shadow .2s;display:block}
.category-card:hover{box-shadow:var(--shadow);border-color:var(--primary)}
.cat-icon{display:block;font-size:28px;margin-bottom:6px}
.cat-name{display:block;font-size:13px;color:var(--text)}
.cat-scroll{display:flex;gap:10px;overflow-x:auto;padding-bottom:8px;-webkit-overflow-scrolling:touch;scrollbar-width:thin;cursor:grab;user-select:none}
.cat-scroll::-webkit-scrollbar{height:4px}
.cat-scroll::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
.cat-scroll::-webkit-scrollbar-track{background:transparent}
.cat-scroll:active{cursor:grabbing}
.cat-scroll .category-card{min-width:90px;flex-shrink:0;padding:14px 8px}
.cat-scroll .cat-count{display:block;font-size:11px;color:var(--text-light);margin-top:4px}

/* ===== All Categories Grid ===== */
.all-cats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.all-cat-group{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:12px}
.all-cat-parent{display:flex;align-items:center;gap:6px;font-size:14px;color:var(--text);margin-bottom:8px}
.all-cat-parent:hover{color:var(--primary)}
.all-cat-children{display:flex;flex-wrap:wrap;gap:6px}
.all-cat-child{display:inline-block;padding:4px 10px;background:var(--bg);border-radius:14px;font-size:12px;color:var(--text-light);text-decoration:none;transition:all .15s}
.all-cat-child:hover{background:#FFF3ED;color:var(--primary)}
@media(max-width:480px){.all-cats-grid{grid-template-columns:1fr}}

/* ===== Hot Tags ===== */
.hot-tags{display:flex;gap:8px;flex-wrap:wrap}
.hot-tag{padding:6px 14px;background:var(--card);border:1px solid var(--border);border-radius:20px;font-size:13px;color:var(--text);cursor:pointer;transition:all .15s;display:inline-block;text-decoration:none}
.hot-tag:hover{border-color:var(--primary);color:var(--primary);background:#FFF3ED}
.hot-tag small{color:var(--text-light);font-weight:400}

/* ===== City Scroll ===== */
.city-scroll{display:flex;gap:8px;overflow-x:auto;padding-bottom:8px;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.city-scroll::-webkit-scrollbar{display:none}
.city-chip{padding:8px 16px;background:var(--card);border:1px solid var(--border);border-radius:20px;font-size:13px;color:var(--text);cursor:pointer;white-space:nowrap;flex-shrink:0;text-decoration:none;transition:all .15s}
.city-chip:hover{border-color:var(--primary);color:var(--primary)}
.city-chip .city-count{color:var(--text-light);font-size:11px;margin-left:4px}

/* ===== Trust Badges ===== */
.trust-badges{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;padding:20px 0;margin-bottom:24px;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.trust-badges .badge{font-size:14px;color:var(--text);display:flex;align-items:center;gap:4px}

/* ===== Post Tabs ===== */
.post-tabs{display:flex;gap:4px}
.tab{padding:6px 16px;border:1px solid var(--border);border-radius:20px;background:var(--card);font-size:13px;cursor:pointer;color:var(--text-light);transition:all .15s}
.tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.tab:hover:not(.active){border-color:var(--primary);color:var(--primary)}

/* ===== Posts ===== */
.posts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.posts-grid .post-card{padding:14px}
.post-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px 18px;transition:box-shadow .2s}
.post-card:hover{box-shadow:var(--shadow)}
.post-title{font-size:16px;font-weight:600;color:var(--text);display:block;margin-bottom:6px}
.post-meta{font-size:12px;color:var(--text-light);display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.post-card img[style*="width:80px"]{width:64px;height:64px}
.fav-btn{background:none;border:none;color:#ccc;cursor:pointer;font-size:16px;padding:0 4px;transition:color .2s;line-height:1}
.fav-btn:hover{color:#e74c3c}
.fav-btn.favorited{color:#e74c3c}

/* ===== Post Detail ===== */
.post-detail-title{font-size:24px;margin-bottom:12px}
.post-detail-meta{font-size:13px;color:var(--text-light);display:flex;gap:16px;flex-wrap:wrap;margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid var(--border)}
.post-detail-body{font-size:15px;line-height:1.8;margin-bottom:24px;white-space:pre-wrap}
.contact-box{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px}
.contact-value{font-size:18px;font-weight:600;color:var(--primary);margin:8px 0}
.safety-tip{font-size:13px;color:#c00;margin-top:8px}

/* ===== Buttons ===== */
.btn-primary{display:inline-block;padding:10px 24px;background:var(--primary);color:#fff;border:none;border-radius:20px;cursor:pointer;font-size:15px;font-weight:600;text-align:center}
.btn-primary:hover{background:var(--primary-hover);color:#fff}
.btn-full{width:100%}
.checkbox-label{display:flex;align-items:center;gap:8px;font-size:14px;padding:8px 0;cursor:pointer}
.checkbox-label input[type=checkbox]{width:auto;min-width:18px;height:18px;margin:0;cursor:pointer;accent-color:var(--primary)}

/* ===== Forms ===== */
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:14px;font-weight:600;margin-bottom:4px;color:var(--text)}
.form-row{display:flex;gap:12px}
.form-row .form-group{flex:1}
input,select,textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:16px;outline:none;font-family:inherit;background:#fff}
input:focus,select:focus,textarea:focus{border-color:var(--primary)}
.radio-group{display:flex;gap:8px;flex-wrap:wrap;padding:6px 0}
.radio-group label{font-weight:400;font-size:14px;display:inline-flex;align-items:center;gap:6px;cursor:pointer;padding:6px 12px;border:1px solid var(--border);border-radius:20px;background:var(--card);transition:all .15s}
.radio-group label:has(input:checked){border-color:var(--primary);background:#FFF3ED;color:var(--primary)}
.radio-group input[type=radio]{width:auto;margin:0}
select{font-size:14px}

/* ===== Utility ===== */
.loading{text-align:center;padding:30px;color:var(--text-light)}
.empty-state{text-align:center;padding:60px 20px}
.empty-icon{font-size:48px;margin-bottom:12px}
.empty-state h3{margin-bottom:8px}
.success-box{text-align:center;padding:40px 20px}
.success-box h2{color:#28a745;margin-bottom:12px}
.link-box{background:#f5f5f5;padding:12px;border-radius:8px;word-break:break-all;font-size:13px;margin:12px 0;color:var(--primary)}
.share-success-btn{display:inline-block;padding:6px 14px;border:1px solid #ddd;border-radius:20px;font-size:13px;cursor:pointer;background:transparent;color:inherit}
.share-success-btn:hover{background:#f5f5f5}

/* ===== Type Badges ===== */
.type-badge{font-size:12px;margin-right:2px}
.type-offer{color:#28a745}
.type-request{color:#e67e22}
.type-exchange{color:#3498db}
.type-group{color:#9b59b6}

/* ===== Footer ===== */
.footer{border-top:1px solid var(--border);padding:24px 16px;text-align:center;font-size:13px;color:var(--text-light);margin-top:40px}
.footer-inner{max-width:800px;margin:0 auto}
.footer a{color:var(--text-light)}

/* ===== Admin ===== */
.admin-wrap{max-width:1100px;margin:0 auto;padding:20px 16px}
.admin-nav{display:flex;gap:4px;flex-wrap:wrap;border-bottom:1px solid var(--border);padding-bottom:8px;margin-bottom:20px}
.admin-nav a{padding:6px 14px;border-radius:6px;font-size:13px;color:var(--text);background:var(--card)}
.admin-nav a:hover{background:var(--primary);color:#fff}
.admin-table-wrap{overflow-x:auto}
.admin-table{width:100%;border-collapse:collapse;font-size:13px;background:var(--card);min-width:600px}
.admin-table th,.admin-table td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border);white-space:nowrap}
.admin-table th{background:#f9f9f9;font-weight:600}

/* ===== Loading Skeleton ===== */
.loading-skeleton{display:flex;flex-direction:column;gap:12px;padding:16px}
.loading-skeleton .sk-card{height:80px;background:linear-gradient(90deg,var(--border) 25%,#f0f0f0 50%,var(--border) 75%);background-size:200% 100%;animation:sk-shimmer 1.5s infinite;border-radius:var(--radius)}
@keyframes sk-shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ===== Mobile (max 768px) ===== */
@media(max-width:768px){
  .header-inner{padding:10px 12px;gap:6px}
  .logo{font-size:16px}
  .header-search{max-width:200px}
  .header-search input{padding:6px 10px;font-size:13px}
  .header-search button{padding:6px 12px;font-size:13px}
  .btn-publish{padding:6px 14px;font-size:13px}
  .hero{padding:28px 20px}
  .hero h1{font-size:22px}
  .hero p{font-size:14px}
  .section{margin-bottom:20px}
  .section h2{font-size:16px;margin-bottom:10px}
  .posts-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .posts-grid .post-card{padding:12px}
  .trust-badges{gap:16px;padding:16px 0;margin-bottom:16px}
  .trust-badges .badge{font-size:13px}
  .category-card{padding:12px 6px}
  .cat-icon{font-size:24px}
  .cat-name{font-size:12px}
  .post-card{padding:12px 14px}
  .post-title{font-size:15px}
  .form-row{flex-direction:column;gap:0}
  .form-row .form-group{margin-bottom:0}
  .post-detail-title{font-size:20px}
  .radio-group{gap:10px}
  .radio-group label{font-size:13px}
  .contact-value{font-size:16px}
  .admin-wrap{padding:12px}
  .admin-nav{gap:2px}
  .admin-nav a{padding:5px 10px;font-size:12px}
  input,select,textarea{font-size:16px}
}

/* ===== Phone (max 480px) ===== */
@media(max-width:480px){
  .header-inner{flex-wrap:wrap;gap:8px;padding:8px 10px}
  .logo{order:1;font-size:15px}
  .btn-publish{order:2;padding:5px 10px;font-size:11px}
  .header-search{order:5;max-width:100%;width:100%;flex-basis:100%;margin-top:2px}
  .header-search input{padding:8px 12px;font-size:14px;border-radius:20px}
  .header-search button{padding:8px 14px;font-size:13px}
  .btn-back{font-size:13px}
  .lang-switch{order:3}
  .hero{padding:20px 14px;border-radius:10px;margin-bottom:16px}
  .hero h1{font-size:17px;line-height:1.3;margin-bottom:6px}
  .hero p{font-size:13px;margin-bottom:14px}
  .hero-actions .btn-lg{padding:10px 20px;font-size:14px}
  .section{margin-bottom:16px}
  .section h2{font-size:15px;margin-bottom:8px}
  .section-header{margin-bottom:8px}
  .posts-grid{grid-template-columns:1fr;gap:8px}
  .posts-grid .post-card{padding:10px 12px}
  .post-card{border-radius:8px}
  .post-title{font-size:14px;line-height:1.4}
  .post-meta{font-size:11px;gap:6px}
  .post-meta span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:120px}
  .post-card img[style*="width:80px"]{width:56px;height:56px;border-radius:6px}
  .post-card>div:first-child{gap:8px}
  .trust-badges{flex-direction:column;align-items:center;gap:8px;padding:12px 0;margin-bottom:12px}
  .trust-badges .badge{font-size:12px}
  .container{padding:10px}
  .container.narrow{padding:10px}
  .category-card{padding:8px 4px;border-radius:8px}
  .cat-icon{font-size:20px}
  .cat-name{font-size:11px}
  .cat-scroll{gap:8px;padding-bottom:6px}
  .cat-scroll .category-card{min-width:80px;padding:10px 6px}
  .hot-tags{gap:6px}
  .hot-tag{padding:5px 10px;font-size:12px}
  .city-scroll{gap:6px}
  .city-chip{padding:6px 12px;font-size:12px}
  .post-detail-title{font-size:18px}
  .contact-box{padding:12px}
  .form-group{margin-bottom:10px}
  .form-group label{font-size:13px}
  input,select,textarea{padding:8px 10px;font-size:16px;border-radius:6px}
  select{font-size:14px}
  .radio-group{gap:6px}
  .radio-group label{font-size:12px;padding:5px 8px}
  h1{font-size:18px;margin-bottom:4px}
  .btn-primary{padding:10px 18px;font-size:14px;border-radius:10px}
  .btn-outline{padding:10px 18px;font-size:14px;border-radius:10px}
  .empty-state{padding:40px 16px}
  .empty-icon{font-size:36px}
  .empty-state h3{font-size:15px}
  .empty-state p{font-size:13px}
  .success-box{padding:24px 16px}
  .success-box h2{font-size:18px}
  .share-success-btn{padding:5px 10px;font-size:12px}
  .footer{padding:16px 12px;font-size:12px}
  .footer-inner p{line-height:1.8}
  .admin-nav{gap:3px;overflow-x:auto;flex-wrap:nowrap;-webkit-overflow-scrolling:touch}
  .admin-nav a{padding:4px 8px;font-size:11px;white-space:nowrap}
  .admin-table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .admin-table{min-width:500px}
  .admin-table th,.admin-table td{padding:8px;font-size:12px}
}

/* ===== FAQ ===== */
.faq-list{display:flex;flex-direction:column;gap:16px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.faq-item h3{font-size:16px;margin-bottom:8px;color:var(--text)}
.faq-item p{font-size:14px;color:var(--text-light);line-height:1.6}