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div{background:var(--surface);text-align:left;border-radius:8px;align-self:flex-start;max-width:88%;padding:8px 10px}.duel-chat-messages div.mine{background:#0f204014;align-self:flex-end}.duel-chat-messages strong{color:var(--ink-3);letter-spacing:.06em;text-transform:uppercase;font-size:10px;font-weight:900;display:block}.duel-chat-messages span{color:var(--ink);overflow-wrap:anywhere;margin-top:3px;font-size:13px;line-height:1.35;display:block}.duel-chat-form{border-top:1px solid var(--rule);grid-template-columns:minmax(0,1fr) auto;gap:8px;padding:10px;display:grid}.duel-chat-form input{border:1px solid var(--rule);min-width:0;font:inherit;border-radius:6px;padding:9px 10px}.duel-chat-form button{background:var(--gold);color:#fff;font:inherit;cursor:pointer;border:0;border-radius:6px;padding:0 12px;font-size:12px;font-weight:900}.duel-chat-form button:disabled{opacity:.5;cursor:not-allowed}.duel-player-avatar img,img.duel-player-avatar{object-fit:cover}@media 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var(--rule);background:var(--surface);border-radius:8px;align-items:center;gap:14px;padding:12px;display:flex}.profile-avatar-upload img,.profile-avatar-upload span{object-fit:cover;background:var(--cobalt);color:#fff;border-radius:8px;flex-shrink:0;place-items:center;width:72px;height:72px;font-size:28px;font-weight:900;display:grid}.profile-avatar-upload label{cursor:pointer}@media (width<=640px){.challenge-duration-picker{grid-template-columns:1fr}}.student-avatar img,.challenge-avatar img{border-radius:inherit;object-fit:cover;width:100%;height:100%}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}:root{--arena-bg:#fafaf8;--arena-surface:#fff;--arena-surface-raised:#fff;--arena-border:#e5e7eb;--arena-border-strong:#cbd5e1;--arena-text:#0f172a;--arena-muted:#64748b;--arena-soft:#94a3b8;--arena-gold:#b7791f}.arena-hub{background:var(--arena-bg);min-height:100vh;color:var(--arena-text)}.arena-hub-header{z-index:20;border-bottom:1px solid var(--arena-border);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#fffffff5;grid-template-columns:1fr auto 1fr;align-items:center;height:64px;padding:0 24px;display:grid;position:sticky;top:0}.arena-hub button{font:inherit}.arena-hub-back,.arena-hub-brand,.arena-hub-watch{color:var(--arena-muted);cursor:pointer;background:0 0;border:0}.arena-hub-back{justify-self:start;align-items:center;gap:8px;font-size:13px;display:flex}.arena-hub-brand{color:var(--arena-text);text-align:left;align-items:center;gap:10px;display:flex}.arena-hub-brand span{flex-direction:column;display:flex}.arena-hub-brand strong{font-size:14px}.arena-hub-brand small{color:var(--arena-muted);margin-top:2px;font-size:11px}.arena-hub-watch{border:1px solid var(--arena-border);border-radius:9px;justify-self:end;padding:8px 13px;font-size:12px;font-weight:700}.arena-hub-main{width:min(100% - 32px,980px);margin:0 auto;padding:36px 0 64px}.arena-hub-embedded{border:1px solid var(--arena-border);border-radius:8px;overflow:hidden}.arena-hub-embedded-header{border-bottom:1px solid var(--arena-border);background:#fff;align-items:center;gap:10px;padding:14px 18px;display:flex}.arena-hub-embedded-header div{flex-direction:column;gap:2px;display:flex}.arena-hub-embedded-header strong{font-size:14px}.arena-hub-embedded-header span{color:var(--arena-muted);font-size:11px}.arena-hub-embedded .arena-hub-content{padding:20px 18px 24px}.arena-hub-title{margin-bottom:28px}.arena-hub-title p{color:var(--arena-gold);letter-spacing:.12em;text-transform:uppercase;margin:0 0 7px;font-size:11px;font-weight:800}.arena-hub-title h1{margin:0;font-size:clamp(25px,4vw,34px);line-height:1.15}.arena-hub-title span{color:var(--arena-muted);margin-top:8px;font-size:14px;display:block}.arena-hub-section{margin-top:28px}.arena-hub-section-heading{justify-content:space-between;align-items:center;gap:12px;margin-bottom:11px;display:flex}.arena-hub-section-heading h2{color:var(--arena-muted);letter-spacing:.06em;text-transform:uppercase;margin:0;font-size:13px}.arena-hub-count{color:var(--arena-soft);font-size:12px}.arena-hub-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;display:grid}.arena-hub-grid-live{grid-template-columns:1fr}.arena-hub-more{width:100%;color:var(--arena-muted);cursor:pointer;border:1px solid var(--arena-border);background:0 0;border-radius:8px;margin-top:10px;padding:10px;font-weight:700}.arena-hub-personal{box-shadow:inset 3px 0 #6ca8f5}.arena-hub-personal-label{color:#0f172a;letter-spacing:.06em;font-size:10px;font-weight:800}@media (width<=700px){.arena-hub-header{grid-template-columns:1fr auto;height:56px;padding:0 12px}.arena-hub-brand{grid-area:1/1}.arena-hub-back span:last-child,.arena-hub-brand small,.arena-hub-watch{display:none}.arena-hub-back{grid-area:1/2;font-size:20px}.arena-hub-main{width:min(100% - 20px,980px);padding:24px 0 42px}.arena-hub-grid{grid-template-columns:1fr}}.arena-watch{background:var(--arena-bg)!important;padding:0 18px 36px!important}.arena-watch-shell{max-width:1240px!important}.arena-watch-header{min-height:64px;border:0!important;border-bottom:1px solid var(--arena-border)!important;box-shadow:none!important;background:#0c1624f5!important;border-radius:0!important;padding:8px 4px!important}.arena-watch-header>button>div:first-child{border-radius:10px!important;width:40px!important;height:40px!important}.arena-watch-header>div:nth-child(2){border-radius:9px!important;min-width:0!important;padding:7px 14px!important;font-size:13px!important}.arena-watch-main{margin-top:16px!important}.arena-watch-stage{box-shadow:none!important;background:#0d1725!important;border-radius:14px!important;padding:18px!important}.arena-watch-question-wrap{margin-bottom:16px!important}.arena-watch-question{border-color:var(--arena-border-strong)!important;background:var(--arena-surface-raised)!important;max-width:none!important;min-height:112px!important;color:var(--arena-text)!important;box-shadow:none!important;border-radius:12px!important;padding:24px 30px!important}.arena-watch-question h1{max-width:820px!important;font-size:clamp(1.25rem,2.5vw,2rem)!important;line-height:1.28!important}.arena-watch-video{box-shadow:none!important;border-radius:12px!important}.arena-watch-aside>div{background:var(--arena-surface)!important;box-shadow:none!important;-webkit-backdrop-filter:none!important;backdrop-filter:none!important;border-radius:12px!important;padding:15px!important}@media (width<=900px){.arena-watch{padding:0 10px 28px!important}.arena-watch-header{grid-template-columns:minmax(0,1fr) auto!important;gap:8px!important}.arena-watch-header>div:nth-child(2){display:none}.arena-watch-header>div:last-child{gap:8px!important}.arena-watch-header>div:last-child>span{padding:8px 10px!important;font-size:11px!important}.arena-watch-header>div:last-child>div{min-width:74px!important;padding:7px 9px!important;font-size:18px!important}.arena-watch-stage{padding:10px!important}.arena-watch-question{min-height:96px!important;padding:20px 16px!important}.arena-watch-content{gap:10px!important}}.learning-page,.admin-learning-page{flex-direction:column;gap:20px;display:flex}.learning-header{justify-content:space-between;align-items:flex-end;gap:24px;display:flex}.learning-header h1{color:var(--cobalt);margin:4px 0;font-size:34px}.learning-header p:not(.overline){color:var(--ink-3);font-size:15px}.learning-mode-switch{border:1px solid var(--rule);background:var(--stone);border-radius:6px;padding:4px;display:inline-flex}.learning-mode-switch button{color:var(--ink-3);cursor:pointer;background:0 0;border:0;border-radius:4px;padding:9px 14px;font:600 14px inherit}.learning-mode-switch button.active{color:var(--cobalt);background:#fff;box-shadow:0 1px 4px #17130f14}.learning-empty{text-align:center;min-height:180px;color:var(--ink-3);flex-direction:column;justify-content:center;align-items:center;gap:6px;display:flex}.learning-empty strong{color:var(--cobalt);font-size:18px}.learning-library-layout{grid-template-columns:minmax(250px,330px) minmax(0,1fr);align-items:start;gap:18px;display:grid}.learning-outline{padding:16px;position:sticky;top:18px}.learning-subject-list{flex-direction:column;gap:8px;margin-top:16px;display:flex}.learning-subject-list details{border-top:1px solid var(--rule);padding-top:8px}.learning-subject-list summary{cursor:pointer;color:var(--cobalt);justify-content:space-between;gap:8px;padding:6px 2px;font-size:15px;font-weight:700;display:flex}.learning-subject-list summary span{color:var(--ink-3);font-size:12px}.learning-subject-list button{text-align:left;width:100%;color:var(--ink);cursor:pointer;background:0 0;border:0;border-radius:5px;flex-direction:column;gap:2px;padding:10px;font-family:inherit;display:flex}.learning-subject-list button:hover,.learning-subject-list button.active{background:#0f204012}.learning-subject-list button strong{font-size:14px}.learning-subject-list button span{color:var(--ink-3);font-size:12px;line-height:1.45}.learning-reader{min-height:480px;padding:30px}.learning-reader h2{color:var(--cobalt);margin:6px 0 10px;font-size:30px}.learning-chapter-summary{border-left:3px solid var(--gold);color:var(--ink-2);margin-bottom:26px;padding-left:14px;font-size:16px}.learning-ask-button{margin-top:26px}.learning-markdown{color:var(--ink-2);overflow-wrap:anywhere;font-size:16px;line-height:1.75}.learning-markdown h1,.learning-markdown h2,.learning-markdown h3{color:var(--cobalt);margin:1.2em 0 .5em;line-height:1.25}.learning-markdown h1{font-size:26px}.learning-markdown h2{font-size:22px}.learning-markdown h3{font-size:18px}.learning-markdown p,.learning-markdown ul,.learning-markdown ol,.learning-markdown blockquote{margin:.7em 0}.learning-markdown ul,.learning-markdown ol{padding-left:24px}.learning-markdown code{background:var(--stone);border-radius:3px;padding:2px 5px}.learning-markdown pre{background:var(--cobalt);color:#fff;border-radius:5px;padding:14px;overflow-x:auto}.learning-markdown blockquote{border-left:3px solid var(--gold);color:var(--ink-3);padding-left:12px}.learning-tutor{padding:22px}.learning-tutor-controls{grid-template-columns:1fr 1.4fr .8fr;gap:12px;display:grid}.learning-quick-prompts{flex-wrap:wrap;gap:8px;margin:18px 0;display:flex}.learning-quick-prompts button{border:1px solid var(--rule);background:var(--surface);color:var(--cobalt);cursor:pointer;border-radius:99px;padding:8px 11px;font:600 12px inherit}.learning-quick-prompts button:hover{border-color:var(--gold)}.learning-chat{border:1px solid var(--rule);background:#fff;border-radius:6px;flex-direction:column;gap:14px;min-height:340px;max-height:540px;padding:18px;display:flex;overflow-y:auto}.learning-chat-empty{text-align:center;color:var(--ink-3);flex-direction:column;margin:auto;display:flex}.learning-chat-empty strong{color:var(--cobalt)}.learning-message{border-radius:10px;max-width:82%;padding:12px 15px}.learning-message>span{text-transform:uppercase;letter-spacing:.06em;margin-bottom:3px;font-size:11px;font-weight:700;display:block}.learning-message.user{background:var(--cobalt);color:#fff;align-self:flex-end}.learning-message.user .learning-markdown{color:#fff}.learning-message.assistant{background:var(--stone);align-self:flex-start}.learning-message .learning-markdown{font-size:14px;line-height:1.6}.learning-chat-form{align-items:flex-end;gap:10px;margin-top:14px;display:flex}.learning-chat-form textarea{resize:vertical}.learning-tutor-error{justify-content:space-between;align-items:center;gap:10px;margin-top:12px;display:flex}.learning-tutor-error button{color:inherit;cursor:pointer;background:0 0;border:0;font-weight:700;text-decoration:underline}.learning-muted{color:var(--ink-3);font-size:14px}.admin-learning-form{flex-direction:column;gap:14px;display:flex}.admin-learning-form-heading,.admin-learning-list-heading,.admin-learning-editor-heading{justify-content:space-between;align-items:center;gap:14px;display:flex}.admin-learning-form h2,.admin-learning-list h2{color:var(--cobalt);font-size:21px}.admin-learning-editor{resize:vertical;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;line-height:1.55}.admin-learning-preview{border:1px solid var(--rule);background:#fff;border-radius:5px;min-height:260px;max-height:520px;padding:20px;overflow-y:auto}.admin-learning-filters{gap:8px;display:flex}.admin-learning-filters 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