:root{color-scheme:light;--ink: #23262b;--ink-soft: #3c4147;--text: #2a2e33;--mist: #6b7672;--faint: #8b948f;--line: #e1e5e0;--line-strong: #cfd6d0;--paper: #ffffff;--pool: #f1f3ef;--water: #16786e;--water-deep: #0e5a52;--wash: #e2eeea;--blush: #c14b41;--blush-wash: #f7e9e7;--radius: 10px;--radius-s: 6px;--font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Segoe UI", "Microsoft YaHei", "Helvetica Neue", sans-serif;--font-display: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "Songti SC", STSong, "SimSun", Georgia, serif;--font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;font-family:var(--font-body);color:var(--text);background:var(--pool);font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html{min-width:320px;background:var(--pool)}body{margin:0;min-width:320px;background:var(--pool);font-size:14px;line-height:1.6}body.modal-open{overflow:hidden}button,input,textarea,select{font:inherit;color:inherit}button{border:0;cursor:pointer;background:transparent;padding:0}button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--water);outline-offset:2px}.display{font-family:var(--font-display);font-weight:700}.waterline{display:block;color:var(--water);flex:none}.eyebrow{display:block;color:var(--faint);font-size:11px;font-weight:600;letter-spacing:.06em}.topbar{position:sticky;top:0;z-index:30;height:64px;background:#ffffffeb;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.topbar-inner{height:100%;max-width:1320px;margin:0 auto;padding:0 32px;display:flex;align-items:center;gap:28px}.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;color:var(--ink)}.brand-mark{width:36px;height:36px;display:grid;place-items:center;border:1px solid var(--line);border-radius:8px;background:var(--paper)}.brand-mark img{width:30px;height:30px;object-fit:contain}.brand-copy{display:flex;flex-direction:column;align-items:flex-start;line-height:1.15;text-align:left}.brand-copy strong{font-size:16px;font-weight:800;letter-spacing:-.02em}.brand-copy span{color:var(--mist);font-size:11px}.desktop-nav{display:flex;align-items:center;gap:4px}.nav-link{padding:8px 12px;border-radius:var(--radius-s);color:var(--mist);font-size:14px;font-weight:500;transition:color .15s ease,background .15s ease}.nav-link:hover{color:var(--ink);background:var(--pool)}.nav-link[aria-current=page]{color:var(--water-deep);background:var(--wash);font-weight:600}.search-box{height:38px;flex:1;min-width:0;max-width:320px;margin-left:auto;display:flex;align-items:center;gap:8px;padding:0 12px;border:1px solid var(--line);border-radius:var(--radius-s);background:var(--pool);color:var(--faint);transition:border-color .15s ease,background .15s ease,box-shadow .15s ease}.search-box:focus-within{border-color:var(--water);background:var(--paper);box-shadow:0 0 0 3px #16786e1f}.search-box svg{flex:none}.search-box input{min-width:0;width:100%;border:0;outline:0;background:transparent;color:var(--text);font-size:13px}.search-box input::placeholder{color:var(--faint)}.search-clear{color:var(--faint);font-size:18px;line-height:1;padding:2px 4px;border-radius:4px}.search-clear:hover{color:var(--ink)}.top-actions{display:flex;align-items:center;gap:14px;flex-shrink:0}.login-link{color:var(--mist);font-size:14px;font-weight:500;padding:8px 2px}.login-link:hover{color:var(--ink)}.user-menu{display:flex;align-items:center;gap:8px}.user-name{max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px;font-weight:600}.logout-button{color:var(--mist);font-size:12px;padding:6px 2px}.logout-button:hover{color:var(--blush)}.button{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 18px;border-radius:8px;color:#fff;background:var(--ink);font-size:14px;font-weight:600;transition:background .15s ease}.button:hover{background:var(--ink-soft)}.button:disabled{cursor:wait;opacity:.6}.button-small{padding:8px 14px;font-size:13px}.button-outline{color:var(--ink);background:transparent;border:1px solid var(--line-strong)}.button-outline:hover{background:var(--paper);border-color:var(--ink)}.text-button{color:var(--water);font-size:13px;font-weight:600}.text-button:hover{color:var(--water-deep);text-decoration:underline;text-underline-offset:3px}.avatar{--avatar-color: var(--water);width:36px;height:36px;flex:0 0 auto;display:inline-grid;place-items:center;border-radius:8px;color:#fff;background:var(--avatar-color);font-size:11px;font-weight:700;letter-spacing:.01em}.avatar-small{width:24px;height:24px;border-radius:6px;font-size:9px}.tag{display:inline-flex;align-items:center;flex:none;padding:1px 6px;border-radius:4px;background:var(--pool);color:var(--mist);font-size:11px;font-weight:600;line-height:1.5;white-space:nowrap}.tag-op{background:var(--wash);color:var(--water-deep)}.tag-pin{background:var(--blush-wash);color:var(--blush)}.cat-chip{display:inline-flex;align-items:center;gap:5px;font-weight:600;color:var(--mist)}.cat-chip i{width:7px;height:7px;border-radius:2px;background:var(--faint)}.app-layout{max-width:1320px;margin:0 auto;padding:28px 32px 64px;display:grid;grid-template-columns:216px minmax(0,1fr) 264px;gap:36px;align-items:start}.main-content{min-width:0}.sidebar{position:sticky;top:92px;min-width:0}.side-motto{margin:0 0 14px;padding:2px 2px 0;font-family:var(--font-display);font-size:14px;color:var(--ink-soft)}.compose-button{width:100%;margin-bottom:22px;padding:11px 10px}.side-section{border-top:1px solid var(--line);padding-top:16px;margin-top:16px}.side-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;color:var(--faint);font-size:11px;font-weight:700;letter-spacing:.05em}.side-count{min-width:20px;padding:0 5px;display:inline-grid;place-items:center;border-radius:4px;background:var(--pool);color:var(--mist);font-family:var(--font-mono);font-size:11px;letter-spacing:0}.category-list{display:grid;gap:2px}.category-link{width:100%;display:flex;align-items:center;gap:9px;padding:7px 8px;border-radius:var(--radius-s);color:var(--mist);text-align:left;font-size:13px;font-weight:500;transition:color .15s ease,background .15s ease}.category-link:hover{color:var(--ink);background:var(--paper)}.category-link.selected{color:var(--water-deep);background:var(--wash);font-weight:600}.category-icon{width:24px;height:24px;flex:none;display:inline-grid;place-items:center;border-radius:6px;background:var(--paper);border:1px solid var(--line);font-size:12px}.category-link.selected .category-icon{border-color:transparent;background:#ffffffb3}.side-rules p{display:flex;gap:8px;margin:8px 0;color:var(--mist);font-size:12px;line-height:1.55}.side-rules p span{flex:none;font-family:var(--font-display);color:var(--faint)}.sidebar-foot{margin-top:22px;display:flex;align-items:center;gap:7px;color:var(--faint);font-size:11px}.status-dot{width:7px;height:7px;border-radius:50%;background:var(--water);box-shadow:0 0 0 3px #16786e26}.hero{padding:6px 0 30px;animation:rise .45s ease both}.hero h1{margin:0;font-family:var(--font-display);font-size:clamp(28px,3.4vw,38px);font-weight:700;line-height:1.3}.hero .waterline{margin:16px 0 14px}.hero p{margin:0;max-width:460px;color:var(--mist);font-size:14px}.hero .button{margin-top:20px}@keyframes rise{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.content-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin:2px 0 24px}.content-heading h1{margin:6px 0 0;font-family:var(--font-display);font-size:clamp(24px,2.6vw,30px);font-weight:700;line-height:1.3}.content-heading p{margin:8px 0 0;color:var(--mist);font-size:13px}.heading-compose{flex-shrink:0;margin-bottom:3px}.list-toolbar{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:0 2px 12px}.list-toolbar strong{font-size:15px;font-weight:700}.topic-total{margin-left:9px;color:var(--faint);font-size:12px;font-family:var(--font-mono)}.filter-tabs{display:flex;gap:2px;padding:3px;border-radius:8px;background:#e7ebe6}.filter-tab{padding:6px 12px;border-radius:6px;color:var(--mist);font-size:12px;font-weight:600;transition:color .15s ease,background .15s ease}.filter-tab:hover{color:var(--ink)}.filter-tab.active{color:var(--ink);background:var(--paper);box-shadow:0 1px 2px #23262b14}.topic-list{overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper)}.topic-row{display:grid;grid-template-columns:36px minmax(0,1fr) 132px;align-items:center;gap:14px;padding:15px 18px;border-bottom:1px solid var(--line);cursor:pointer;transition:background .15s ease,box-shadow .15s ease}.topic-row:last-child{border-bottom:0}.topic-row:hover{background:#fafbfa;box-shadow:inset 2px 0 0 var(--water)}.topic-row:focus-visible{outline-offset:-2px}.topic-main{min-width:0}.topic-row-heading{display:flex;align-items:center;gap:7px;min-width:0}.topic-row h3{margin:0;overflow:hidden;font-size:14px;font-weight:600;line-height:1.5;letter-spacing:0;text-overflow:ellipsis;white-space:nowrap}.topic-meta{display:flex;gap:12px;overflow:hidden;margin-top:5px;color:var(--faint);font-size:12px;white-space:nowrap}.topic-meta>span:not(.cat-chip){overflow:hidden;text-overflow:ellipsis}.topic-nums{display:flex;justify-content:flex-end;gap:20px}.topic-nums span{display:flex;flex-direction:column;align-items:center;gap:1px}.topic-nums b{font-family:var(--font-mono);font-size:13px;font-weight:600;color:var(--ink-soft)}.topic-nums small{color:var(--faint);font-size:11px}.topic-skeleton{display:grid;grid-template-columns:36px 1fr;gap:14px;padding:16px 18px;border-bottom:1px solid var(--line)}.topic-skeleton>span,.topic-skeleton b,.topic-skeleton i{display:block;border-radius:6px;background:linear-gradient(90deg,#eef0ed 20%,#f7f8f6,#eef0ed 80%);background-size:200% 100%;animation:shimmer 1.3s infinite}.topic-skeleton>span{width:36px;height:36px;border-radius:8px}.topic-skeleton div{display:grid;gap:8px;align-content:center}.topic-skeleton b{width:62%;height:13px}.topic-skeleton i{width:38%;height:10px}@keyframes shimmer{to{background-position:-200% 0}}.empty-state{padding:64px 20px;border:1px dashed var(--line-strong);border-radius:var(--radius);background:#fff9;text-align:center}.empty-state .waterline{margin:0 auto;color:var(--faint)}.empty-state h3{margin:14px 0 6px;font-family:var(--font-display);font-size:17px}.empty-state p{margin:0 0 16px;color:var(--mist);font-size:13px}.list-footer{display:flex;justify-content:space-between;align-items:center;margin:14px 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2;padding-top:2px;color:var(--faint);font-family:var(--font-mono);font-size:11px;font-weight:500}.trending-list span{overflow:hidden;font-size:13px;font-weight:500;line-height:1.45;color:var(--text);text-overflow:ellipsis;white-space:nowrap}.trending-list small{color:var(--faint);font-size:11px;font-family:var(--font-mono)}.rail-muted{margin:12px 0 0;color:var(--mist);font-size:12px}.treehole-card{background:var(--wash);border-color:#cfe2dc}.treehole-card h3{margin:0;font-family:var(--font-display);font-size:15px;color:var(--water-deep)}.treehole-card p{margin:8px 0 12px;color:#43635c;font-size:12px;line-height:1.7}.topic-detail{max-width:760px}.back-button{display:inline-flex;align-items:center;gap:7px;padding:5px 0;color:var(--mist);font-size:13px}.back-button:hover{color:var(--water-deep)}.back-button span{font-size:17px;line-height:1}.detail-heading{padding:24px 0 22px}.detail-heading .cat-chip{font-size:12px}.detail-heading h1{margin:10px 0 14px;max-width:680px;font-family:var(--font-display);font-size:clamp(24px,3.2vw,34px);font-weight:700;line-height:1.35}.detail-meta{display:flex;align-items:center;gap:8px;color:var(--faint);font-size:12px}.detail-meta .author{color:var(--ink-soft);font-weight:600}.posts-stack{display:grid;gap:12px}.post-card{display:grid;grid-template-columns:36px minmax(0,1fr);gap:14px;padding:18px 20px 14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper)}.post-body{min-width:0}.post-heading{display:flex;justify-content:space-between;align-items:baseline;gap:10px}.post-id{display:flex;align-items:center;gap:7px;min-width:0}.post-id strong{font-size:13px;color:var(--ink-soft)}.post-id time{margin-left:2px;color:var(--faint);font-size:12px}.floor{flex:none;color:var(--faint);font-family:var(--font-mono);font-size:11px}.post-body>p{margin:10px 0 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0;display:flex;justify-content:center;gap:6px;color:var(--faint);font-size:12px;text-align:center}.topic-detail-loading{padding-top:40px}.detail-skeleton{height:230px;margin-bottom:14px;border-radius:var(--radius);background:linear-gradient(90deg,#eef0ed,#f7f8f6,#eef0ed);background-size:200% 100%;animation:shimmer 1.3s infinite}.detail-skeleton.short{height:120px}.global-error{display:flex;align-items:center;gap:9px;margin-bottom:16px;padding:11px 14px;border:1px solid #e5c5bf;border-radius:8px;background:#fdf6f4;color:#9c4438;font-size:13px}.global-error button{margin-left:auto;color:#9c4438;font-size:17px;line-height:1;padding:0 3px}.toast{position:fixed;z-index:100;left:50%;bottom:28px;transform:translate(-50%);display:flex;align-items:center;gap:9px;padding:12px 18px;border-radius:8px;color:#fff;background:var(--ink);box-shadow:0 12px 32px #23262b47;font-size:13px;animation:toast-in .22s ease}.toast span{color:#7fd0c3;font-weight:700}@keyframes 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28px;text-align:center}.auth-mark{display:inline-grid;place-items:center;width:46px;height:46px;border:1px solid var(--line);border-radius:10px;background:var(--pool)}.auth-mark img{width:34px;height:34px;object-fit:contain}.auth-modal h2{margin:14px 0 6px;font-family:var(--font-display);font-size:22px}.auth-modal>p{margin:0 0 22px;color:var(--mist);font-size:13px}.auth-switch{margin-top:20px;color:var(--faint);font-size:12px}.auth-switch button{margin-left:5px;color:var(--water);font-weight:600}.auth-switch button:hover{color:var(--water-deep);text-decoration:underline;text-underline-offset:3px}.form-stack{display:grid;gap:14px;text-align:left}.form-stack>label,.composer-row label{display:grid;gap:6px;color:var(--ink-soft);font-size:12px;font-weight:600}.form-stack input[type=text],.form-stack input:not([type]),.form-stack input[type=password],.form-stack textarea,.form-stack select{width:100%;padding:10px 12px;border:1px solid var(--line-strong);border-radius:8px;outline:0;background:var(--paper);color:var(--text);font-size:14px;transition:border-color .15s ease,box-shadow .15s ease}.form-stack input:focus,.form-stack textarea:focus,.form-stack select:focus{border-color:var(--water);box-shadow:0 0 0 3px #16786e1f}.form-stack input::placeholder,.form-stack textarea::placeholder{color:var(--faint)}.form-stack textarea{min-height:180px;resize:vertical;line-height:1.75}.form-submit{margin-top:2px}.auth-modal .form-submit{width:100%}.form-error{padding:9px 12px;border-radius:var(--radius-s);background:#fdf6f4;border:1px solid #e5c5bf;color:#9c4438;font-size:12px;line-height:1.5}.composer-modal{padding:30px 34px 26px}.composer-top{margin-bottom:20px}.composer-top h2{margin:6px 0 0;font-family:var(--font-display);font-size:21px;line-height:1.4}.composer-row{display:flex;gap:12px;align-items:start}.composer-row .grow{flex:1}.category-select{width:170px;flex:0 0 170px}.composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px}.check-label{display:inline-flex;align-items:center;gap:7px;color:var(--mist);font-size:12px}.check-label input{width:15px;height:15px;accent-color:var(--water)}.check-label input:disabled{opacity:.55}.char-count{color:var(--faint);font-size:11px;font-family:var(--font-mono)}.composer-submit-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:2px}.composer-submit-row .form-submit{min-width:120px}.composer-tip{color:var(--faint);font-size:12px}.mobile-nav{display:none}@media(max-width:1180px){.app-layout{grid-template-columns:200px minmax(0,1fr);gap:28px}.right-rail{display:none}.topbar-inner{gap:20px}.search-box{max-width:280px}}@media(max-width:760px){body{padding-bottom:68px}.topbar{height:58px}.topbar-inner{padding:0 16px;gap:10px}.brand-mark{width:32px;height:32px}.brand-mark img{width:26px;height:26px}.brand-copy strong{font-size:14px}.brand-copy span,.desktop-nav,.login-link,.user-name,.logout-button{display:none}.search-box{height:36px;max-width:none;padding:0 10px}.top-actions{gap:8px}.app-layout{display:block;padding:20px 16px 36px}.sidebar{display:none}.hero{padding:2px 0 24px}.hero h1{font-size:27px}.hero p{font-size:13px}.content-heading{flex-direction:column;align-items:flex-start;gap:14px;margin-bottom:18px}.list-toolbar{flex-direction:column;align-items:stretch;gap:10px}.filter-tabs{justify-content:stretch}.filter-tab{flex:1;padding:7px 8px;text-align:center}.topic-row{grid-template-columns:34px minmax(0,1fr);gap:12px;padding:13px 14px}.topic-row .avatar{width:34px;height:34px}.topic-row h3{white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.topic-meta{flex-wrap:wrap;white-space:normal;gap:8px 12px}.topic-nums{display:none}.detail-heading{padding:20px 0 18px}.post-card{grid-template-columns:32px minmax(0,1fr);gap:11px;padding:14px 14px 11px}.post-card .avatar{width:32px;height:32px}.modal-backdrop{padding:0;align-items:end}.modal{max-height:calc(100vh - 32px);border-radius:14px 14px 0 0}.auth-modal{padding:30px 22px 24px}.composer-modal{padding:24px 18px 20px}.composer-row{display:grid;gap:13px}.category-select{width:auto}.form-stack textarea{min-height:150px}.composer-submit-row{flex-direction:column-reverse;align-items:stretch}.composer-tip{text-align:center}.toast{right:16px;bottom:80px;left:16px;transform:none;justify-content:center;animation-name:toast-mobile-in}@keyframes toast-mobile-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.mobile-nav{position:fixed;z-index:40;right:0;bottom:0;left:0;height:64px;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);background:#fffffff2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.mobile-nav button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--mist);font-size:11px}.mobile-nav button[aria-current=page],.mobile-nav button:active{color:var(--water-deep)}}@media(max-width:390px){.brand-copy{display:none}.topbar-inner{gap:8px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}