:root{--primary: #1E88E5;--primary-dark: #1976D2;--primary-light: #E3F2FD;--text: #111111;--text-secondary: #667C99;--muted: #a0a0a0;--border: #e0e0e0;--bg: #ffffff;--bg-control: #E8ECF3;--white: #fff;--danger: #d33;--radius: 4px;--header-bg: #ffffff;--header-color: #111111;--header-border: #e0e0e0;--logo-color: #426799;--hero-bg: #1E88E5;--hero-color: #ffffff;--material-blue: #1976D2}*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Ubuntu,Cantarell,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:13px;line-height:1.5;overflow-y:scroll}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.app{min-height:100vh;display:flex;flex-direction:column}.app-main{flex:1;width:100%;margin:0 auto;padding:15px;max-width:1100px}.app-footer{border-top:1px solid var(--border);background:var(--white);text-align:center;padding:12px;color:var(--text-secondary);font-size:12px}.app-header{background:var(--header-bg);color:var(--header-color);position:sticky;top:0;z-index:100;border-bottom:1px solid var(--header-border)}.app-header-inner{max-width:1100px;margin:0 auto;padding:0 15px;height:52px;display:flex;align-items:center;gap:16px}.header-search{flex:1;display:flex;justify-content:flex-end}.header-search form{width:100%;max-width:280px;margin-left:auto}.header-search-input{width:100%;padding:8px 32px;border:none;border-radius:var(--radius);background:var(--bg-control);color:var(--text-secondary);font-size:13px;font-family:inherit}.header-search-input:focus{outline:none;background:#dce2ec;color:var(--text)}.header-search-input::placeholder{color:var(--text-secondary)}.header-locale{color:var(--text-secondary);font-size:13px;cursor:default;white-space:nowrap}.app-logo{font-size:18px;font-weight:400;color:var(--logo-color)}.app-logo:hover{text-decoration:none;color:var(--logo-color);opacity:.85}.app-header-actions{display:flex;align-items:center;gap:8px}.header-link{cursor:pointer;color:var(--text-secondary);font-size:13px;padding:8px 13px;border-radius:var(--radius)}.header-link:hover{background:var(--bg-control);color:var(--text);text-decoration:none}.header-user{font-weight:600;color:var(--text)}.header-user:hover{text-decoration:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 13px;border-radius:var(--radius);border:1px solid transparent;font-size:13px;cursor:pointer;transition:background .15s;background:var(--bg-control);color:var(--text-secondary)}.btn:hover{background:#dce2ec;color:var(--text);text-decoration:none}.btn-primary{background:var(--primary);color:#fff;border-color:transparent;font-weight:700;padding:8px 20px}.btn-primary:hover{background:var(--primary-dark);color:#fff}.btn-primary:disabled{background:#90caf9;cursor:not-allowed}.btn-outlined{background:var(--bg-control);color:var(--text-secondary)}.btn-outlined:hover{background:#dce2ec;color:var(--text)}.btn-google{background:#fff;border:1px solid var(--border);color:var(--text);width:100%}.btn-google:hover{background:var(--bg-control)}.btn-block{width:100%}.btn-sm{padding:5px 10px;font-size:12px}.btn-icon{border:none;font-size:18px;color:var(--text-secondary);padding:4px 8px;background:none}.form-control{width:100%;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;font-family:inherit;background:#fff;color:var(--text)}.form-control:focus{outline:none;border-color:var(--primary)}.chip{padding:4px 12px;border-radius:20px;border:1px solid var(--border);background:#fff;cursor:pointer;font-size:12px;color:var(--text-secondary);transition:all .15s}.chip:hover{border-color:var(--primary)}.chip-active{background:var(--primary);border-color:var(--primary);color:#fff}.alert{padding:8px 12px;border-radius:var(--radius);margin:8px 0;font-size:13px}.alert-error{background:#fdebec;color:var(--danger)}.index-page{display:flex;gap:20px;align-items:flex-start}.index-nav{width:190px;flex-shrink:0;position:sticky;top:61px;display:flex;flex-direction:column;gap:14px}.index-new-discussion{margin-bottom:2px}.index-nav-section{display:flex;flex-direction:column}.index-nav-label{font-size:11px;text-transform:uppercase;color:var(--muted);margin:8px 8px 4px;letter-spacing:.5px}.index-nav-item{padding:8px 0 8px 30px;color:var(--text-secondary);font-size:13px;display:flex;align-items:center;gap:8px;border-radius:0}.tag-nav-icon{width:16px;text-align:center}.tag-badge i{margin-right:3px}.index-nav-item:hover{background:var(--bg-control);color:var(--text);text-decoration:none}.index-nav-item.active{color:var(--text)}.index-results{flex:1;min-width:0}.hero{background:var(--hero-bg);color:var(--hero-color);text-align:center;padding:20px 15px 15px;margin:-15px -15px 12px}.hero-content{font-size:13px;color:var(--hero-color)}.index-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;color:var(--text-secondary);font-size:13px}.index-toolbar .btn{margin-left:auto}.page-header{display:flex;align-items:center;justify-content:space-between;margin:0 0 12px;padding:6px 2px}.page-header h2{font-size:15px;font-weight:600;color:var(--text);margin:0}.discussion-list{background:var(--white);border:1px solid var(--border);border-radius:var(--radius)}.discussion-card{display:flex;align-items:center;justify-content:space-between;padding:0 15px;min-height:52px;border-bottom:1px solid var(--border);transition:background 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7px;border-radius:2px;font-size:11px}.discussion-private-badge,.discussion-sticky-badge{margin-right:4px;font-size:11px}.trip-search{background:var(--white);border-radius:8px;padding:20px 24px;margin:15px 0;box-shadow:0 1px 3px #0000001f,0 1px 2px #00000014}.trip-search-title{font-weight:600;margin-bottom:12px;font-size:16px;color:#000000de}.trip-search-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}@media(max-width:800px){.trip-search-grid{grid-template-columns:1fr}}.trip-search-field{display:flex;flex-direction:column;gap:5px}.trip-search-label{font-size:12px;color:var(--text-secondary)}.trip-search-dates{display:flex;align-items:center;gap:6px}.trip-search-sep{color:var(--text-secondary)}.trip-search-actions{display:flex;gap:8px;margin-top:12px}.trip-search-actions .btn-primary{background:var(--material-blue);font-weight:500;padding:9px 22px;font-size:14px}.trip-search-actions .btn-outlined{background:transparent;border:1px solid var(--border);color:var(--text-secondary);padding:9px 22px;font-size:14px}.city-ac,.city-ac-input-wrap{position:relative}.city-ac-input{width:100%;padding:10px 30px 10px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;font-family:inherit}.city-ac-input:focus{outline:none;border-color:var(--primary)}.city-ac-clear{position:absolute;right:6px;top:50%;transform:translateY(-50%);cursor:pointer;color:var(--text-secondary);font-size:16px;padding:0 4px}.city-ac-chips{display:flex;flex-wrap:wrap;gap:4px;margin-top:5px}.city-ac-chip{display:inline-flex;align-items:center;gap:5px;background:var(--primary-light);color:var(--primary-dark);padding:2px 8px;border-radius:12px;font-size:12px}.city-ac-chip-del{cursor:pointer;font-weight:700}.city-ac-menu{position:absolute;z-index:200;top:calc(100% + 2px);left:0;right:0;background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 6px 18px #0000001f;max-height:300px;overflow-y:auto}.city-ac-group{padding:4px 12px 2px;font-size:11px;font-weight:700;color:var(--text-secondary);background:var(--bg-control);position:sticky;top:0}.city-ac-option{display:flex;justify-content:space-between;align-items:center;padding:6px 12px;cursor:pointer}.city-ac-option:hover{background:var(--primary-light)}.city-ac-option-name{font-size:13px}.city-ac-pinyin{font-size:11px;color:var(--text-secondary)}.city-ac-empty{padding:14px;text-align:center;color:var(--text-secondary);font-size:13px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:500;display:flex;align-items:flex-start;justify-content:center;padding:40px 16px;overflow-y:auto}.composer{background:#fff;border-radius:var(--radius);width:100%;max-width:620px;box-shadow:0 10px 30px #00000040;overflow:hidden}.composer-header{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--border);background:var(--bg-control)}.composer-title{font-weight:600;font-size:13px}.composer-body{padding:12px 16px;display:flex;flex-direction:column;gap:10px}.composer-title-input{font-size:14px;font-weight:600}.composer-tags{display:flex;gap:6px;flex-wrap:wrap}.composer-field{display:flex;flex-direction:column;gap:5px}.composer-field-label{font-size:13px;font-weight:600}.composer-field-desc{font-size:12px;color:var(--text-secondary)}.composer-content{font-family:inherit;resize:vertical}.composer-footer{display:flex;justify-content:flex-end;gap:8px;padding:12px 16px;border-top:1px solid var(--border)}.composer-recipients{display:flex;flex-direction:column;gap:5px}.discussion-hero{background:var(--hero-bg);border-radius:var(--radius);padding:16px 18px;margin:-15px -15px 15px;text-align:center;position:relative}.discussion-hero-title{font-size:18px;font-weight:600;color:#fff}.discussion-hero-title a{color:#fff}.discussion-hero-meta{display:flex;justify-content:center;gap:12px;margin-top:6px;color:#ffffffe6;font-size:12px;flex-wrap:wrap}.discussion-hero-meta a{color:#fff}.discussion-answers{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px;justify-content:center}.discussion-answer-chip{background:#ffffffb3;color:var(--primary-dark);padding:2px 10px;border-radius:12px;font-size:12px}.post-list{display:flex;flex-direction:column}.post{display:flex;gap:12px;background:var(--white);border-bottom:1px solid var(--border);padding:14px 16px}.post:last-child{border-bottom:none}.post-first{background:#f8fbff}.post-deleted{opacity:.55}.post-deleted-badge{color:var(--danger);font-size:12px}.post-sidebar{width:70px;text-align:center;flex-shrink:0}.post-avatar{width:40px;height:40px;border-radius:50%;background:var(--primary-light);color:var(--primary-dark);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;margin:0 auto 4px}.post-author{font-size:12px;font-weight:600;word-break:break-all;color:var(--text-secondary)}.post-main{flex:1;min-width:0}.post-meta{display:flex;gap:8px;color:var(--text-secondary);font-size:12px;margin-bottom:6px}.post-number{color:var(--primary)}.post-content{font-size:13px;word-break:break-word}.post-content img{max-width:100%}.post-content blockquote{border-left:3px solid var(--border);padding-left:10px;color:var(--text-secondary);margin:8px 0}.post-content pre{background:var(--bg-control);padding:10px;border-radius:4px;overflow-x:auto}.post-actions{margin-left:auto;display:flex;gap:10px}.post-actions a{cursor:pointer;color:var(--text-secondary);font-size:12px}.post-actions a:hover{color:var(--primary);text-decoration:none}.post-actions .post-action-danger:hover{color:var(--danger)}.btn-topic-danger{position:absolute;right:18px;top:50%;transform:translateY(-50%);border:1px solid rgba(255,255,255,.5);background:transparent;color:#fffffff2;border-radius:var(--radius);padding:5px 12px;font-size:12px;cursor:pointer;transition:all .15s}.btn-topic-danger:hover{background:#ffffff26;color:#fff;border-color:#fff}.post-edit{display:flex;flex-direction:column;gap:8px}.post-edit-actions{display:flex;justify-content:flex-end;gap:8px}.reply-box{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px;margin-top:14px}.reply-actions{display:flex;justify-content:flex-end;margin-top:8px}.auth-page{display:flex;justify-content:center;padding:40px 16px}.auth-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;width:100%;max-width:380px;display:flex;flex-direction:column;gap:10px}.auth-card h2{text-align:center;font-size:18px;font-weight:600;margin-bottom:4px}.auth-divider{text-align:center;color:var(--text-secondary);font-size:12px;margin:2px 0}.auth-switch{text-align:center;font-size:13px;color:var(--text-secondary)}.auth-switch a{cursor:pointer}.profile-card{display:flex;gap:18px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:15px}.profile-avatar{width:68px;height:68px;border-radius:50%;background:var(--primary-light);color:var(--primary-dark);display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700;flex-shrink:0}.profile-info{flex:1;display:flex;flex-direction:column;gap:6px;align-items:flex-start}.profile-info h2{font-size:17px;font-weight:600}.profile-meta{display:flex;gap:12px;color:var(--text-secondary);font-size:12px}.profile-bio{color:var(--text-secondary);font-size:13px}.profile-bio-edit{display:flex;gap:8px;width:100%;flex-direction:column}.profile-section-title{margin-bottom:10px;font-size:15px;font-weight:600}.loading,.empty{text-align:center;color:var(--text-secondary);padding:30px}.pagination{display:flex;justify-content:center;align-items:center;gap:10px;margin-top:15px}.risk-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px}.risk-modal{background:#fff;border-radius:var(--radius);max-width:540px;width:100%;padding:20px;box-shadow:0 14px 40px #0000004d;max-height:85vh;overflow-y:auto}.risk-modal h3{margin-bottom:12px;font-size:15px}.risk-body{color:var(--text);font-size:13px}.risk-body strong{color:var(--danger)}.risk-body ul{padding-left:18px;margin:6px 0}.risk-body li{margin:4px 0}.risk-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}