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.modal-backdrop{position:fixed;inset:0;background:rgba(13,22,43,.48);backdrop-filter:blur(5px);z-index:80;opacity:0;visibility:hidden;transition:.25s}.modal-backdrop.open{opacity:1;visibility:visible}.modal{position:fixed;z-index:90;left:50%;top:50%;transform:translate(-50%,-46%) scale(.97);width:min(430px,calc(100vw - 30px));max-height:90vh;overflow:auto;background:#fff;border-radius:24px;padding:28px;opacity:0;visibility:hidden;transition:.25s;box-shadow:0 35px 90px rgba(11,21,44,.32)}.modal.open{opacity:1;visibility:visible;transform:translate(-50%,-50%) scale(1)}.modal-close{position:absolute;right:17px;top:15px;border:0;background:#f2f4f8;border-radius:50%;width:30px;height:30px;color:#7c879a}.modal-brand{display:flex;flex-direction:column;align-items:center;text-align:center}.modal-brand .brand-mark{margin-bottom:12px}.modal-brand b{font-size:18px}.modal-brand small{color:#8c96a7;margin-top:5px}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;background:#f2f4f8;border-radius:11px;padding:4px;margin:22px 0 17px}.auth-tabs button{height:35px;border:0;background:transparent;border-radius:8px;color:#7e889a}.auth-tabs button.active{background:#fff;color:var(--blue);font-weight:700;box-shadow:0 3px 10px rgba(35,49,80,.08)}.modal form>label,.modal form>div>label{display:block;font-size:10px;color:#6f7a8d;font-weight:700;margin:12px 0 6px}.modal input,.modal textarea,.modal select{width:100%;border:1px solid #dfe3eb;border-radius:10px;outline:0;background:#fff;padding:11px 12px;font-size:12px}.modal textarea{min-height:110px;resize:vertical}.modal input:focus,.modal textarea:focus,.modal select:focus{border-color:#8d98e8;box-shadow:0 0 0 3px #f0f1ff}.verify-row{display:grid;grid-template-columns:1fr 105px;gap:8px}.verify-row button{border:0;border-radius:10px;background:#eef0ff;color:var(--blue);font-size:10px;font-weight:700}.remember{display:flex!important;align-items:center;gap:8px;font-weight:400!important}.remember input{width:auto}.admin-entry{width:100%;margin-top:9px;border:0;background:none;color:#8993a5;font-size:10px}.auth-tip{text-align:center;color:#a0a7b4;font-size:9px;margin:15px 0 0}.avatar-picker{display:flex;gap:8px}.avatar-picker button{width:42px;height:42px;border:2px solid transparent;border-radius:50%;background:#eef1ff;font-size:21px}.avatar-picker button.selected{border-color:var(--blue);background:#e2e6ff}.post-modal{width:min(650px,calc(100vw - 30px))}.post-modal h2{margin:7px 0 18px}.form-grid{display:grid;grid-template-columns:1.4fr .6fr;gap:12px}.upload-strip{display:flex;align-items:center;gap:10px;margin:12px 0}.upload-strip button{border:1px dashed #bcc5d6;background:#f7f8fb;border-radius:9px;padding:10px 12px;font-size:10px;color:#60708a}.upload-strip span{font-size:9px;color:#929bad}.ip-options{display:flex;gap:7px;margin-bottom:17px}.ip-options button{border:1px solid var(--line);border-radius:20px;background:#fff;padding:7px 12px;font-size:10px}.ip-options button.selected{background:#eef0ff;border-color:#cbd1fa;color:var(--blue);font-weight:700}.drawer{position:fixed;z-index:90;right:0;top:0;bottom:0;width:min(650px,100vw);background:#fff;box-shadow:-20px 0 60px rgba(14,24,49,.2);transform:translateX(105%);transition:.3s;padding:34px;overflow:auto}.drawer.open{transform:translateX(0)}.drawer-close{position:absolute;right:22px;top:20px;border:0;background:#f0f2f6;width:32px;height:32px;border-radius:50%}.drawer-tag{display:inline-flex;padding:5px 9px;background:#edf0ff;color:var(--blue);border-radius:7px;font-size:10px;font-weight:700}.drawer h2{font-size:25px;line-height:1.45;margin:13px 0}.drawer-author{display:flex;align-items:center;gap:10px;color:#7c879a;font-size:10px;padding-bottom:20px;border-bottom:1px solid var(--line)}.drawer-body{font:14px/2 SimSun,"宋体",serif;color:#4c5870;padding:22px 0}.original-file{background:#f4f6fa;border-radius:14px;padding:13px;margin:0 0 18px}.original-file .image-preview{height:190px;border-radius:10px;background:linear-gradient(145deg,#fff,#eceff6);display:grid;place-items:center;color:#8d97aa;font-size:11px;background-position:center;background-size:contain;background-repeat:no-repeat}.reply-head{display:flex;justify-content:space-between;align-items:center;margin:12px 0}.reply-head h3{font-size:15px}.reply{display:grid;grid-template-columns:36px 1fr;gap:10px;padding:15px 0;border-top:1px solid var(--line)}.reply p{font:12px/1.8 SimSun,"宋体",serif;color:#5f6b80}.reply small{color:#98a1b1}.adopted{background:#f1fbf6;border-radius:12px;padding:13px;border:1px solid #d7f2e4}.reply-box{margin-top:15px}.reply-box textarea{width:100%;min-height:85px;border:1px solid #dfe4ed;border-radius:11px;padding:12px;resize:vertical}.reply-box button{margin-top:8px}.admin-panel{position:fixed;z-index:100;right:20px;top:88px;width:290px;background:#192744;color:#fff;border-radius:20px;padding:18px;box-shadow:0 28px 60px rgba(9,18,39,.34);transform:translateY(-15px);opacity:0;visibility:hidden;transition:.25s}.admin-panel.open{transform:none;opacity:1;visibility:visible}.admin-head{display:flex;justify-content:space-between;align-items:center}.admin-head>div{display:flex;align-items:center;gap:9px}.admin-head .brand-mark{width:34px;height:34px}.admin-head b{font-size:12px;display:block}.admin-head small{font-size:7px;letter-spacing:.13em;color:#8f9bb3}.admin-head button{border:0;background:rgba(255,255,255,.1);color:white;border-radius:50%;width:28px;height:28px}.admin-user{display:flex;gap:10px;align-items:center;margin:18px 0;padding:13px;background:rgba(255,255,255,.06);border-radius:12px}.admin-user b{font-size:11px;display:block}.admin-user small{font-size:9px;color:#aab4c7}.admin-panel>button{width:100%;height:39px;border:0;border-radius:9px;margin-top:7px;font-size:10px;background:#eaf0ff;color:#304dc3;font-weight:700}.admin-panel>button:last-child{background:rgba(255,255,255,.08);color:#c6cedd}.toast{position:fixed;z-index:120;left:50%;bottom:28px;transform:translate(-50%,30px);opacity:0;visibility:hidden;display:flex;align-items:center;gap:10px;background:#17233c;color:#fff;border-radius:13px;padding:12px 17px;box-shadow:0 13px 35px rgba(13,24,50,.3);transition:.25s}.toast.show{opacity:1;visibility:visible;transform:translate(-50%,0)}.toast span{width:24px;height:24px;border-radius:50%;background:#35ba82;display:grid;place-items:center;font-size:10px}.toast p{font-size:11px;margin:0}footer{max-width:1200px;margin:0 auto;padding:34px 30px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;color:#929bad;font-size:10px}footer .brand-mark{width:30px;height:30px;font-size:17px}footer .brand b{font-size:12px}
@media(max-width:1050px){.search-box{display:none}.main-nav{gap:0}.nav-link{padding:9px}.hero-shell{gap:35px}.hero-copy h1{font-size:44px}.board-grid{grid-template-columns:repeat(2,1fr)}.format-note{margin-left:30px;margin-right:30px}}
@media(max-width:820px){.topbar{height:66px;padding:0 16px}.main-nav{position:fixed;bottom:0;left:0;right:0;height:60px;background:#fff;border-top:1px solid var(--line);justify-content:space-around;z-index:70}.nav-link{font-size:11px}.top-actions .ghost-btn,.top-actions .compact{display:none}.hero-shell{grid-template-columns:1fr;padding-top:45px}.hero-card{height:320px}.page-grid{grid-template-columns:1fr}.side-column{padding-top:0}.tool-hero{display:block}.ai-status{margin-top:20px;width:max-content}.formula-workspace{grid-template-columns:1fr}.format-note{grid-template-columns:1fr 1fr;gap:18px}.format-note>div{border:0}.podium{margin-left:20px;margin-right:20px}.rule-grid{grid-template-columns:1fr 1fr}.levels{grid-template-columns:repeat(4,1fr);gap:18px}.level{border:0}.ranking-table-card{margin-left:20px;margin-right:20px}.topbar .brand small{display:none}footer{margin-bottom:60px}.tool-hero h1,.ranking-hero h1,.rules-wrap>h1{font-size:36px}}
@media(max-width:560px){.topbar .brand b{font-size:14px}.user-chip b,.user-chip i{display:none}.hero-shell{padding:38px 18px}.hero-copy h1{font-size:37px}.hero-copy>p{font-size:14px}.hero-stats{gap:15px}.hero-card{height:290px}.formula-card{width:84%;padding:18px}.page-grid{padding:0 16px 70px}.board-grid{grid-template-columns:1fr 1fr}.post-card{grid-template-columns:38px 1fr}.post-card>.avatar{width:38px;height:38px}.post-stats{grid-column:2;flex-direction:row;align-items:center}.tool-hero,.formula-workspace{padding-left:17px;padding-right:17px}.tool-hero h1,.ranking-hero h1,.rules-wrap>h1{font-size:31px}.format-note{margin:0 17px 75px;grid-template-columns:1fr}.format-note>div{padding:3px}.podium{grid-template-columns:1fr;align-items:stretch;margin-top:-95px}.podium-card{display:none}.podium-card.first{display:block}.ranking-table-card{padding:15px;margin:0 12px 70px;overflow:auto}.table-head,.rank-row{min-width:620px}.rule-grid{grid-template-columns:1fr}.levels{grid-template-columns:repeat(2,1fr)}.modal{padding:24px 20px}.form-grid{grid-template-columns:1fr}.drawer{padding:28px 20px}.top-actions{gap:3px}.hero-actions{flex-direction:column}.hero-actions button{width:100%}footer{flex-direction:column;gap:15px;text-align:center}}

/* iPhone-inspired appearance and user-selectable color themes */
body[data-theme="ocean"],body:not([data-theme]){--blue:#3478f6;--blue2:#1264e6;--accent-soft:#eaf2ff;--accent-shadow:rgba(52,120,246,.24);--hero-dark1:#102447;--hero-dark2:#244d8e;--bg:#f2f2f7;--paper:rgba(255,255,255,.92)}
body[data-theme="mint"]{--blue:#1a9c79;--blue2:#087b60;--accent-soft:#e5f7f1;--accent-shadow:rgba(26,156,121,.23);--hero-dark1:#123c36;--hero-dark2:#267b6b;--bg:#f1f6f4;--paper:rgba(255,255,255,.92)}
body[data-theme="iris"]{--blue:#7665e8;--blue2:#5a45cf;--accent-soft:#f0edff;--accent-shadow:rgba(118,101,232,.24);--hero-dark1:#272044;--hero-dark2:#55479a;--bg:#f4f2f8;--paper:rgba(255,255,255,.92)}
body[data-theme="coral"]{--blue:#ed6a52;--blue2:#d94b35;--accent-soft:#fff0ec;--accent-shadow:rgba(237,106,82,.23);--hero-dark1:#48251f;--hero-dark2:#965040;--bg:#f7f3f1;--paper:rgba(255,255,255,.92)}
body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","PingFang SC","Noto Sans SC",sans-serif;background:var(--bg);letter-spacing:-.005em}.topbar{background:rgba(249,249,251,.78);backdrop-filter:saturate(180%) blur(24px);-webkit-backdrop-filter:saturate(180%) blur(24px);border-bottom:1px solid rgba(60,60,67,.12)}
.brand-mark,.primary-btn,.sign-card{background:linear-gradient(145deg,var(--blue),var(--blue2))}.brand-mark,.primary-btn{box-shadow:0 8px 20px var(--accent-shadow)}.primary-btn,.soft-btn,.ghost-btn{border-radius:14px}.primary-btn:active,.soft-btn:active,.ghost-btn:active,.board-card:active{transform:scale(.97)}.soft-btn,.nav-link.active,.verify-row button,.invite-card button{background:var(--accent-soft);color:var(--blue)}
.hero-card{background:linear-gradient(145deg,var(--hero-dark1),var(--hero-dark2));border-radius:32px}.board-card,.post-card,.side-card,.upload-panel,.process-panel,.correction-panel,.rule-card,.ranking-table-card,.levels{border-color:rgba(60,60,67,.10);box-shadow:0 8px 28px rgba(0,0,0,.045);border-radius:22px}.sign-card{border-radius:22px}.modal{border-radius:28px}.filter-tabs,.auth-tabs{background:rgba(118,118,128,.10);border-radius:12px}.filter-tabs button,.auth-tabs button{border-radius:9px}.search-box{background:rgba(118,118,128,.09);border:0;border-radius:12px}.user-chip{border-color:rgba(60,60,67,.12);box-shadow:0 4px 15px rgba(0,0,0,.05)}
.theme-trigger{width:38px;height:38px;border:0;border-radius:50%;background:rgba(118,118,128,.10);display:grid;place-items:center;transition:.2s}.theme-trigger:active{transform:scale(.92)}.theme-trigger span{width:19px;height:19px;border-radius:50%;background:conic-gradient(#3478f6 0 25%,#1a9c79 0 50%,#7665e8 0 75%,#ed6a52 0);border:2px solid #fff;box-shadow:0 0 0 1px rgba(60,60,67,.16)}
.theme-popover{position:fixed;z-index:110;right:max(20px,calc((100vw - 1260px)/2));top:69px;width:270px;padding:12px;background:rgba(255,255,255,.88);backdrop-filter:saturate(180%) blur(28px);-webkit-backdrop-filter:saturate(180%) blur(28px);border:1px solid rgba(60,60,67,.12);border-radius:22px;box-shadow:0 22px 60px rgba(0,0,0,.18);opacity:0;visibility:hidden;transform:translateY(-8px) scale(.97);transform-origin:top right;transition:.2s}.theme-popover.open{opacity:1;visibility:visible;transform:none}.theme-popover-head{display:flex;align-items:center;justify-content:space-between;padding:5px 7px 10px}.theme-popover-head b{font-size:14px;display:block}.theme-popover-head small{font-size:9px;color:#8e8e93}.theme-popover-head button{border:0;background:rgba(118,118,128,.12);border-radius:50%;width:26px;height:26px;color:#6d6d72}.theme-option{width:100%;display:grid;grid-template-columns:38px 1fr 22px;align-items:center;text-align:left;gap:10px;border:0;background:transparent;border-radius:14px;padding:9px}.theme-option:hover{background:rgba(118,118,128,.08)}.theme-option .swatch{width:34px;height:34px;border-radius:50%;box-shadow:inset 0 0 0 1px rgba(0,0,0,.06),0 3px 9px rgba(0,0,0,.10)}.swatch.ocean{background:linear-gradient(145deg,#62a0ff,#1d67e4)}.swatch.mint{background:linear-gradient(145deg,#53c7a8,#118366)}.swatch.iris{background:linear-gradient(145deg,#9b8df3,#654fda)}.swatch.coral{background:linear-gradient(145deg,#ff927e,#dd523b)}.theme-option span b{font-size:12px;display:block}.theme-option span small{font-size:9px;color:#8e8e93}.theme-option em{font-style:normal;color:var(--blue);opacity:0;font-weight:800}.theme-option.active em{opacity:1}
@media(max-width:560px){.theme-popover{right:12px;top:62px;width:260px}.theme-trigger{width:34px;height:34px}.theme-trigger span{width:17px;height:17px}}

/* AI + manual worksheet segmentation */
.segment-studio{max-width:1140px;margin:0 auto 34px;background:#fff;border:1px solid rgba(60,60,67,.10);border-radius:24px;padding:24px;box-shadow:0 12px 34px rgba(0,0,0,.055)}
.segment-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:16px;border-bottom:1px solid var(--line)}.segment-heading>div{display:flex;align-items:center;gap:10px}.segment-heading b{font-size:15px;display:block}.segment-heading small{display:block;color:#8e96a5;font-size:9px;margin-top:3px}.segment-heading>strong{font-size:10px;color:var(--blue);font-weight:700}
.segment-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:8px;padding:16px 0 9px}.segment-toolbar button{height:38px;font-size:10px}.region-tool{border:0;border-radius:12px;padding:0 14px;font-size:10px;font-weight:700;height:38px}.region-tool.question{color:#d93631;background:#fff0ef}.region-tool.solution{color:#2267d5;background:#eaf2ff}.region-tool.figure{color:#16845c;background:#e8f7f1}.segment-help{margin:0 0 15px;color:#7e8798;font-size:10px;line-height:1.7}
.segment-layout{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(250px,.55fr);gap:16px;align-items:start}.segment-canvas-wrap{background:#eef0f4;border-radius:16px;padding:10px;max-height:720px;overflow:auto}.segment-canvas-wrap canvas{display:block;width:100%;height:auto;background:#fff;border-radius:9px;box-shadow:0 4px 16px rgba(0,0,0,.08)}.segment-canvas-wrap canvas.drawing{cursor:crosshair}.segment-list{display:flex;flex-direction:column;gap:8px;max-height:720px;overflow:auto}.segment-empty{padding:22px;border:1px dashed #ccd2dd;border-radius:14px;color:#8e96a5;font-size:10px;line-height:1.7}.segment-item{display:grid;grid-template-columns:28px 1fr;gap:8px;padding:10px;border-radius:14px;background:#f8f9fb;border-left:4px solid #aab2c1}.segment-item.question{border-color:#ef453f}.segment-item.solution{border-color:#3478f6}.segment-item.figure{border-color:#20a464}.segment-item>span{grid-row:1/3;width:27px;height:27px;border-radius:8px;display:grid;place-items:center;background:#fff;font-size:10px;font-weight:800}.segment-item b{font-size:10px;display:block}.segment-item small{font-size:8px;color:#939aa8}.segment-item select{grid-column:2;border:1px solid #dfe3ea;border-radius:8px;background:#fff;padding:6px;font-size:9px}.segment-item button{grid-column:2;border:0;background:#fff0ef;color:#d34d43;border-radius:8px;padding:6px;font-size:9px}
.segment-draft{margin-top:24px;padding-top:4px}.draft-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:16px}.draft-grid label{font-size:10px;font-weight:700;color:#697386}.draft-grid textarea{display:block;width:100%;min-height:170px;margin-top:7px;border:1px solid #dfe3eb;border-radius:13px;padding:12px;resize:vertical;background:#fbfcfe;font:13px/1.7 SimSun,"宋体",serif}.draft-grid textarea:focus{outline:0;border-color:var(--blue);box-shadow:0 0 0 3px var(--accent-soft)}.draft-grid .draft-latex textarea{font-family:"Times New Roman",monospace}.draft-preview{border:1px solid #e2e5ec;background:#f7f8fc;border-radius:14px;padding:13px;min-height:210px}.draft-preview>b{font-size:10px}.draft-preview pre{white-space:pre-wrap;word-break:break-word;font:15px/1.65 "Times New Roman",serif;color:#26314d}.draft-preview figure{display:inline-block;width:140px;margin:8px 8px 0 0}.draft-preview img{display:block;width:100%;height:90px;object-fit:contain;background:white;border-radius:8px}.draft-preview figcaption{text-align:center;font-size:8px;color:#858e9e}.draft-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}.draft-actions button{height:40px;font-size:10px}
@media(max-width:820px){.segment-studio{margin:0 17px 80px;padding:16px}.segment-layout,.draft-grid{grid-template-columns:1fr}.segment-list{max-height:none}.segment-toolbar .primary-btn{width:auto}.segment-heading{align-items:flex-start}.segment-heading>strong{text-align:right}}

.segment-studio.composer-mode{position:fixed;z-index:115;inset:3vh max(18px,calc((100vw - 1180px)/2));max-width:none;margin:0;padding:24px;overflow:auto;box-shadow:0 35px 100px rgba(8,18,42,.34)}
.segment-composer-open{overflow:hidden}
.segment-composer-close{position:absolute;z-index:3;right:16px;top:14px;width:34px;height:34px;border:0;border-radius:50%;background:#eef1f6;color:#687386;font-size:21px}.segment-studio.composer-mode .segment-heading{padding-right:38px}
.composer-recognition{border:1px solid rgba(52,120,246,.2);background:#f7f9ff;border-radius:15px;padding:12px;margin:12px 0}.composer-recognition>div:first-child{display:flex;gap:9px;align-items:center}.composer-recognition>div:first-child>span,.discussion-recognition-head>span{width:31px;height:31px;display:grid;place-items:center;border-radius:9px;background:var(--blue);color:#fff;font-weight:800}.composer-recognition p{margin:0}.composer-recognition b,.composer-recognition small{display:block}.composer-recognition b{font-size:11px}.composer-recognition small{font-size:8px;color:#7f899b;margin-top:2px}.composer-recognition>#postRecognitionRendered{max-height:190px;overflow:auto;margin:10px 0;padding:10px;background:#fff;border-radius:11px}.composer-recognition>button{border:0;background:var(--accent-soft);color:var(--blue);border-radius:9px;padding:8px 11px;font-size:9px;font-weight:700}
.post-recognized{display:inline-flex;margin:8px 7px 0 0;padding:5px 8px;border-radius:7px;background:var(--accent-soft);color:var(--blue);font-size:9px;font-weight:700}.discussion-recognition{margin:4px 0 18px;border:1px solid rgba(52,120,246,.16);border-radius:16px;background:#fbfcff;overflow:hidden}.discussion-recognition-head{display:flex;gap:9px;align-items:center;padding:12px 14px;border-bottom:1px solid var(--line)}.discussion-recognition-head b,.discussion-recognition-head small{display:block}.discussion-recognition-head b{font-size:11px}.discussion-recognition-head small{font-size:8px;color:#8b94a4}.discussion-math{padding:16px;font:14px/1.85 SimSun,"宋体",serif;color:#27334d;overflow:auto}.discussion-math h3,.discussion-math h4{font-family:inherit;margin:8px 0 12px}.discussion-math ol,.discussion-math ul{padding-left:24px}.recognized-figures{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;padding:0 14px 14px}.recognized-figures figure{margin:0;background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px}.recognized-figures img{display:block;width:100%;height:150px;object-fit:contain}.recognized-figures figcaption{text-align:center;font-size:8px;color:#8c95a4;margin-top:5px}.original-file summary{cursor:pointer;font-size:10px;color:var(--blue);font-weight:700;margin-bottom:10px}.reply-math .recognized-figures{padding:10px 0 0}.reply-math .recognized-figures img{height:110px}
.recognized-solution{border-top:1px solid var(--line);background:#f4f7ff}.recognized-solution>summary{cursor:pointer;list-style:none;padding:12px 16px;color:var(--blue);font-size:10px;font-weight:800}.recognized-solution>summary::-webkit-details-marker{display:none}.recognized-solution>summary:before{content:'▸';display:inline-block;margin-right:7px;transition:.18s}.recognized-solution[open]>summary:before{transform:rotate(90deg)}.recognized-solution[open]>summary{border-bottom:1px solid var(--line)}.recognized-solution .discussion-math{background:#fff}.reply-math-value .discussion-math{padding:10px 0}.reply-math-value .recognized-solution{margin-top:9px;border-radius:10px;overflow:hidden}.composer-recognition .recognized-solution{border-radius:10px;overflow:hidden;margin-top:8px}
@media(max-width:820px){.segment-studio.composer-mode{inset:8px;margin:0;padding:16px}.segment-studio.composer-mode .segment-layout{grid-template-columns:1fr}.recognized-figures{grid-template-columns:1fr}}

.auth-tabs{grid-template-columns:repeat(3,1fr)}.auth-tabs button{font-size:11px}.research-code-note{font-size:9px;line-height:1.6;color:#777e8f;background:var(--accent-soft);border-radius:10px;padding:9px 11px;margin:9px 0 0}.ai-status.connected>span{background:linear-gradient(145deg,#24ad7b,#168a61)}.ai-status.connected small{color:#19835f}.ai-status.fallback>span{background:linear-gradient(145deg,#f3a33d,#db7e18)}

.reply-toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:8px 0}.reply-upload{border:0;background:var(--accent-soft);color:var(--blue);border-radius:11px;padding:9px 12px;font-size:10px;font-weight:700}.reply-toolbar>span{font-size:9px;color:#989fac}.reply-file-info{display:flex;align-items:center;justify-content:space-between;border:1px solid rgba(60,60,67,.11);background:#f7f8fb;border-radius:13px;padding:10px 12px;margin:8px 0}.reply-file-info>div{display:flex;align-items:center;gap:9px}.reply-file-info>div>span{width:31px;height:31px;border-radius:9px;background:var(--accent-soft);color:var(--blue);display:grid;place-items:center}.reply-file-info p{margin:0}.reply-file-info b{font-size:10px;display:block}.reply-file-info small{font-size:8px;color:#929aa9}.reply-file-info>button{border:0;background:rgba(118,118,128,.12);width:25px;height:25px;border-radius:50%;color:#747b88}.convert-option{display:flex!important;align-items:center;justify-content:space-between;padding:11px 12px;background:#f7f8fb;border-radius:13px;margin:8px 0 11px;cursor:pointer}.convert-option span b{font-size:10px;display:block}.convert-option span small{font-size:8px;color:#9098a7}.convert-option input{display:none}.convert-option>i{width:41px;height:24px;border-radius:20px;background:#c8c9ce;position:relative;transition:.2s;flex:none}.convert-option>i:after{content:"";position:absolute;width:20px;height:20px;left:2px;top:2px;border-radius:50%;background:white;box-shadow:0 2px 5px rgba(0,0,0,.18);transition:.2s}.convert-option input:checked+i{background:var(--blue)}.convert-option input:checked+i:after{transform:translateX(17px)}.reply-material{border:1px solid rgba(60,60,67,.10);border-radius:14px;padding:9px;margin:9px 0;background:#fafbfc}.reply-image{height:150px;border-radius:10px;background-size:contain;background-position:center;background-repeat:no-repeat;background-color:#eef0f4;margin-bottom:8px}.reply-file-row{display:flex;align-items:center;gap:8px}.reply-file-row>span{width:30px;height:30px;border-radius:9px;background:var(--accent-soft);color:var(--blue);display:grid;place-items:center}.reply-file-row b{font-size:10px;display:block}.reply-file-row small{font-size:8px;color:#9199a8}.reply-math{margin-top:9px;padding:10px;border-radius:11px;background:var(--accent-soft)}.reply-math>div:first-child{display:grid;grid-template-columns:25px 1fr;column-gap:7px}.reply-math>div:first-child span{grid-row:1/3;width:25px;height:25px;border-radius:7px;background:var(--blue);color:white;display:grid;place-items:center;font:700 13px Georgia}.reply-math b{font-size:9px}.reply-math small{font-size:8px;color:#737c90}.reply-math-value{font:18px "Times New Roman",serif;margin:10px 0 2px;color:#26324c}.user-reply{background:rgba(52,120,246,.025);border-radius:15px;padding-left:10px;padding-right:10px}

.reply-actions{display:flex;align-items:center;gap:6px;margin-top:10px}.reply-actions button{border:0;background:rgba(118,118,128,.08);color:#767f90;border-radius:999px;min-height:29px;padding:0 10px;font-size:9px;transition:.18s}.reply-actions button:active{transform:scale(.95)}.reply-actions button b{font-size:9px}.reaction-btn.like.active{background:var(--accent-soft);color:var(--blue);font-weight:700}.reaction-btn.dislike.active{background:#fff0ec;color:#de593f;font-weight:700}.reaction-btn span{font-size:12px;font-weight:800}.followup-list{margin:10px 0 0;padding:4px 9px;background:rgba(118,118,128,.055);border-radius:12px}.followup-item{display:grid;grid-template-columns:25px 1fr;gap:7px;padding:8px 0;border-bottom:1px solid rgba(60,60,67,.08)}.followup-item:last-child{border:0}.followup-item .avatar{width:25px;height:25px;font-size:12px}.followup-item p{margin:0!important;display:grid;grid-template-columns:auto 1fr auto;gap:6px;align-items:baseline;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif!important}.followup-item b{font-size:9px;white-space:nowrap}.followup-item span{font-size:10px;color:#5f6879}.followup-item small{font-size:8px;white-space:nowrap}.followup-composer{display:grid;grid-template-columns:1fr auto;gap:7px;margin-top:8px}.followup-composer input{border:1px solid #dfe3eb;border-radius:10px;padding:9px 10px;outline:0;font-size:10px}.followup-composer input:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--accent-soft)}.followup-composer button{border:0;border-radius:10px;background:var(--blue);color:white;padding:0 12px;font-size:9px;font-weight:700}
.owner-bounty-note{margin:12px 0 0;padding:10px 12px;border-radius:11px;background:#fff8e5;color:#8d651b;font-size:9px;font-weight:700}.adopted-award{display:inline-flex;align-items:center;margin-top:8px;padding:6px 9px;border-radius:8px;background:#e7f8ef;color:#16845c;font-size:9px;font-weight:800}.reply-actions .adopt-toggle{background:#e7f8ef;color:#16845c;font-weight:800}.adopt-composer{margin-top:8px;padding:10px;border:1px solid #ccebdd;border-radius:11px;background:#f3fbf7}.adopt-composer>span{display:block;color:#4b695b;font-size:9px;margin-bottom:7px}.adopt-composer>div{display:grid;grid-template-columns:minmax(80px,130px) auto;gap:7px}.adopt-composer input{min-width:0;border:1px solid #c7ded3;border-radius:9px;padding:8px 9px;outline:0}.adopt-composer button{border:0;border-radius:9px;background:#20a464;color:white;font-size:9px;font-weight:800;padding:0 12px}
.drawer-tags{display:flex;align-items:center;gap:7px}.post-tag.pinned-tag,.drawer-tag.pinned-tag{background:#fff0e4;color:#cf6e1c}.post-tag.featured-tag,.drawer-tag.featured-tag{background:#fff6cf;color:#9b7012}.post-admin-actions{display:flex;align-items:center;gap:7px;margin:12px 0 0;padding:9px 11px;border-radius:12px;background:#f3f5f9}.post-admin-actions>span{margin-right:auto;color:#7b8596;font-size:9px;font-weight:700}.post-admin-actions button{border:0;border-radius:9px;background:#fff;color:#5f697b;padding:7px 10px;font-size:9px;font-weight:700;box-shadow:0 2px 8px rgba(25,35,58,.06)}.post-admin-actions button.active{background:var(--blue);color:#fff}.post-admin-actions button:disabled{opacity:.55}

.reply-correction{margin:10px 0;padding:12px;border:1px solid rgba(60,60,67,.10);border-radius:15px;background:#f8f9fb}.reply-correction-head{display:grid;grid-template-columns:34px 1fr;gap:9px;align-items:center;margin-bottom:10px}.reply-correction-head>span{width:34px;height:34px;border-radius:10px;background:linear-gradient(145deg,var(--blue),var(--blue2));color:white;display:grid;place-items:center;font-size:10px;font-weight:800}.reply-correction-head b{font-size:10px;display:block}.reply-correction-head small{font-size:8px;color:#8d95a4}.reply-correction textarea{width:100%;min-height:70px;border:1px solid #dfe3eb;border-radius:10px;padding:10px;font:13px "Times New Roman",serif;outline:0;resize:vertical;background:#fff}.reply-correction textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--accent-soft)}.reply-correction-preview{margin-top:8px;padding:9px 10px;border-radius:10px;background:var(--accent-soft)}.reply-correction-preview small{font-size:8px;color:#81899a}.reply-correction-preview div{margin-top:6px;font:18px "Times New Roman",serif;color:#27324b}

/* 积分明细、附件查看、AI 解析与正文可读性 */
.post-excerpt,.drawer-body,.reply p,.discussion-math,.reply-math-value{color:#000!important}
.points-modal{width:min(560px,calc(100vw - 30px))}.points-modal h2{margin:8px 0 16px}.points-summary{display:flex;align-items:center;gap:14px;padding:16px;border-radius:18px;background:linear-gradient(135deg,var(--accent-soft),#fff);border:1px solid rgba(52,120,246,.14)}.points-summary>span{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;background:#fff;font-size:27px}.points-summary div{display:grid;grid-template-columns:auto auto;align-items:end;column-gap:10px}.points-summary small{grid-column:1/3;color:#7d8798;font-size:9px}.points-summary b{font-size:27px;color:#111827}.points-summary em{font-style:normal;color:var(--blue);font-size:10px;font-weight:800;margin-bottom:5px}.points-ledger{margin-top:14px;max-height:430px;overflow:auto}.points-entry{display:grid;grid-template-columns:38px 1fr auto;gap:10px;align-items:center;padding:13px 4px;border-bottom:1px solid var(--line)}.points-entry>span{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;background:#eaf8f1;color:#168456;font-weight:900}.points-entry.negative>span{background:#fff0ed;color:#c9543d}.points-entry b,.points-entry small{display:block}.points-entry b{font-size:11px;color:#111}.points-entry small{font-size:8px;color:#8992a2;margin-top:3px}.points-entry strong{font-size:13px;color:#168456;text-align:right}.points-entry.negative strong{color:#c9543d}.points-entry strong small{font-weight:400}.points-empty{text-align:center;color:#8b94a4;padding:35px 0;font-size:10px}
.attachment-actions{display:flex;gap:7px;margin-left:auto}.attachment-actions a{display:inline-flex;align-items:center;padding:7px 10px;border-radius:9px;background:var(--accent-soft);color:var(--blue);font-size:9px;font-weight:800;text-decoration:none}.reply-image{display:block}.original-file-actions{display:flex;gap:8px;margin-top:10px}.original-file-actions a{padding:8px 11px;border-radius:9px;background:#fff;color:var(--blue);font-size:9px;font-weight:800;text-decoration:none}
.ai-display-option{display:flex!important;align-items:center;gap:9px;padding:10px 11px;margin:9px 0;border-radius:11px;background:#eef6ff}.ai-display-option.hidden,.ai-solution-editor.hidden{display:none!important}.ai-display-option input{width:auto}.ai-display-option span b,.ai-display-option span small{display:block}.ai-display-option span b{font-size:10px}.ai-display-option span small{font-size:8px;color:#7c8798}.ai-solution-builder{margin-top:15px;padding:14px;border:1px solid rgba(52,120,246,.18);border-radius:15px;background:#f7f9ff}.ai-solution-head{display:flex;align-items:center;gap:10px}.ai-solution-head>div{margin-right:auto}.ai-solution-head b,.ai-solution-head small{display:block}.ai-solution-head b{font-size:11px}.ai-solution-head small{font-size:8px;color:#7d8798;margin-top:3px}.ai-solution-head button{border:0;border-radius:10px;background:var(--blue);color:#fff;padding:9px 12px;font-size:9px;font-weight:800}.ai-solution-editor{margin-top:12px}.ai-solution-editor textarea{width:100%;min-height:160px;border:1px solid #dfe3eb;border-radius:12px;padding:12px;resize:vertical;background:#fff;font:13px/1.7 SimSun,"宋体",serif}.ai-solution-preview{margin-top:10px;padding:12px;background:#fff;border-radius:11px}.ai-generated-solution{margin-top:12px;border:1px solid rgba(52,120,246,.18);border-radius:12px;overflow:hidden;background:#f5f8ff}.ai-generated-solution summary{cursor:pointer;padding:11px 14px;color:var(--blue);font-size:10px;font-weight:800}.ai-generated-solution .discussion-math{background:#fff}
@media(max-width:560px){.points-entry{grid-template-columns:34px 1fr auto}.attachment-actions{width:100%;margin:8px 0 0}.reply-file-row{flex-wrap:wrap}.ai-solution-head{align-items:flex-start;flex-wrap:wrap}.ai-solution-head button{width:100%}}

/* Champion audio upload and moderation */
.champion-audio-upload{display:flex;flex-direction:column;gap:7px;align-items:center;margin-top:8px}.champion-audio-upload button{border:0;border-radius:9px;background:#edf2ff;color:var(--blue);padding:8px 12px;font-weight:700}.champion-audio-upload small{font-size:9px;color:#7d8799;max-width:180px}.admin-audio-review{margin:14px 0;padding:12px;border:1px solid var(--line);border-radius:12px;background:#f7f8fb}.admin-audio-review>div{display:flex;justify-content:space-between;align-items:center}.admin-audio-review button{border:0;border-radius:7px;padding:6px 8px;color:var(--blue);background:#eaf0ff}.admin-audio-review section{display:flex;flex-direction:column;gap:9px;margin-top:10px}.admin-audio-item{padding:9px;background:#fff;border-radius:9px}.admin-audio-item b,.admin-audio-item small{display:block}.admin-audio-item small{color:#8a94a6;margin:3px 0 7px}.admin-audio-item audio{width:100%;height:32px}.admin-audio-actions{display:flex;gap:6px;margin-top:7px}.admin-audio-actions button{flex:1}.admin-audio-actions .reject{color:#c94b4b;background:#fff0f0}
/* 内容治理与举报入口 */
.report-link{border:0;background:transparent;color:#556fba;font-size:12px;cursor:pointer;padding:4px 6px;border-radius:6px}.report-link:hover{background:#edf2ff}.post-report{margin:12px 0}.followup-item{display:flex;gap:8px;align-items:flex-start}.followup-item .report-link{margin-left:auto;white-space:nowrap}.footer-links{display:flex;gap:12px;align-items:center}.footer-links button{border:0;background:transparent;color:inherit;text-decoration:underline;cursor:pointer;font:inherit}.report-modal,.rules-modal{width:min(560px,calc(100vw - 30px))}.report-modal form{display:grid;gap:9px}.report-modal select,.report-modal textarea,.report-lookup input{width:100%;border:1px solid #dce2ed;border-radius:11px;padding:11px;background:#f8f9fc;color:#18243c}.report-modal textarea{min-height:110px;resize:vertical}.report-modal label{font-weight:700;font-size:12px}.report-modal>p,.rules-modal p,.rules-modal li{line-height:1.7;color:#536078}.report-lookup,.report-receipt,.report-my-list{margin-top:18px;padding:14px;border-radius:14px;background:#f3f6fb;display:grid;gap:8px}.report-lookup button{border:0;background:#e7edfa;color:#3156b8;padding:10px;border-radius:9px;font-weight:700;cursor:pointer}.report-receipt code{overflow-wrap:anywhere}.report-my-list:empty{display:none}.report-my-list article{border-top:1px solid #dde5f1;padding-top:8px}.report-my-list small{display:block;color:#8691a7}.report-my-list p{margin:4px 0}.admin-review-item{padding:12px;margin:9px 0;background:#f7f9fd;border:1px solid #e5eaf4;border-radius:12px;display:grid;gap:5px}.admin-review-item b{font-size:12px}.admin-review-item small{color:#8390a5}.admin-review-item p{margin:0;font-size:12px;line-height:1.5}.admin-review-item blockquote{margin:0;padding:8px;background:#fff;border-left:3px solid #bdc9e9;font-size:11px;line-height:1.5;overflow-wrap:anywhere}.admin-review-item>button{border:0;border-radius:8px;padding:8px;background:#e8eeff;color:#3758ad;cursor:pointer}.admin-panel{overflow-y:auto}.register-only.remember a{color:#4169d5;text-decoration:underline}
.admin-review-item.overdue{border-color:#ec968f;background:#fff4f2}.admin-review-item.overdue small{color:#c4322e;font-weight:700}