@layer theme{:root,:host{--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color 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components;@layer utilities{.visible{visibility:visible}.fixed{position:fixed}.static{position:static}.grow{flex-grow:1}.rounded{border-radius:.25rem}.capitalize{text-transform:capitalize}}:root{font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.6}button:focus-visible,input:focus-visible{outline:3px solid var(--focus);outline-offset:3px}h1,h2,p{margin-top:0}h1,h2{letter-spacing:-.045em}h1{font-size:clamp(2.25rem,5vw,3.6rem);line-height:1.08}h2{font-size:clamp(1.35rem,3vw,1.9rem);line-height:1.16}p{line-height:1.62}.app,.onboarding{--bg:#f8faf9;--panel:#fff;--soft:#e5f3ee;--text:#183530;--muted:#5b716c;--line:#deebe7;--accent:#236e65;--accent-text:#fff;--focus:#ad6c1b;--success:#226f59;--shadow:0 16px 42px #1c4d420f;background:var(--bg);min-height:100vh;color:var(--text)}.theme-explorer{--bg:#fffbf3;--panel:#fff;--soft:#fff0d5;--text:#3e3427;--muted:#756b5b;--line:#eee2ce;--accent:#89520d;--accent-text:#fff;--focus:#9b5a13;--success:#27755e;--shadow:0 16px 42px #704f1d12}.theme-challenger{--bg:#171e35;--panel:#242b4d;--soft:#303b65;--text:#f8f9ff;--muted:#c4cbea;--line:#424e76;--accent:#aab7ff;--accent-text:#151c34;--focus:#f2aa71;--success:#80ded0;--shadow:0 16px 42px #03071a33}.app-frame{max-width:1600px;min-height:100vh;margin:auto;display:flex}.sidebar{border-right:1px solid var(--line);flex-direction:column;flex:none;gap:45px;width:245px;padding:31px 17px;display:flex}.brand{align-items:center;gap:11px;padding:0 8px;display:flex}.brand-mark{background:var(--accent);width:42px;height:42px;color:var(--accent-text);letter-spacing:-.11em;border-radius:14px;place-items:center;font-size:23px;font-weight:850;line-height:1;display:grid;position:relative}.brand-mark span{color:#f2ba5e;font-size:12px;position:absolute;top:5px;right:6px}.brand strong{letter-spacing:-.04em;font-size:18px;line-height:1.1;display:block}.brand small{color:var(--muted);white-space:nowrap;margin-top:3px;font-size:10px;display:block}.sidebar nav{gap:5px;display:grid}.nav-item{color:var(--muted);text-align:left;background:0 0;border:0;border-radius:12px;align-items:center;gap:14px;padding:13px 17px;font-weight:650;display:flex}.nav-item:hover,.nav-item.active{color:var(--accent);background:var(--soft)}.sidebar-note{color:var(--muted);align-items:center;gap:10px;margin-top:auto;padding:14px;font-size:13px;display:flex}.main-column{flex:1;min-width:0}.topbar{border-bottom:1px solid var(--line);justify-content:flex-end;align-items:center;gap:24px;height:85px;padding:0 clamp(24px,5vw,75px);display:flex}.topbar-greeting{color:var(--muted);font-size:13px}.avatar{background:var(--soft);color:var(--accent);border:0;border-radius:50%;width:38px;height:38px;font-weight:750}.mobile-brand{display:none}.page-content{max-width:1130px;margin:auto;padding:49px clamp(24px,5vw,75px) 80px}.page-heading{margin-bottom:30px}.page-heading h1{max-width:740px;margin:8px 0 10px}.page-heading p{color:var(--muted);margin:0;font-size:16px}.eyebrow{color:var(--accent);letter-spacing:.15em;font-size:11px;font-weight:850}.button{border:1px solid #0000;border-radius:13px;justify-content:center;align-items:center;gap:10px;min-height:47px;padding:12px 20px;font-size:14px;font-weight:750;transition:transform .16s,background .16s;display:inline-flex}.button:hover:not(:disabled){transform:translateY(-1px)}.button-primary{background:var(--accent);color:var(--accent-text)}.button-secondary{background:var(--soft);color:var(--text);border-color:var(--line)}.button-ghost{color:var(--accent);background:0 0}.hero-card{background:var(--soft);border:1px solid var(--line);border-radius:27px;justify-content:space-between;align-items:center;gap:30px;min-height:270px;padding:clamp(28px,4vw,44px);display:flex;overflow:hidden}.hero-card>div:first-child{z-index:1;position:relative}.hero-card h2{max-width:430px;margin:20px 0 9px;font-size:clamp(1.7rem,3vw,2.25rem)}.hero-card p{color:var(--muted);max-width:410px;margin:0 0 24px}.pill{background:var(--panel);color:var(--accent);letter-spacing:.08em;border-radius:20px;align-items:center;gap:7px;padding:8px 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strong{letter-spacing:-.05em;font-size:28px;line-height:1.15}.stat-card small{color:var(--muted);margin-top:4px;font-size:13px}.section-heading{margin-bottom:18px}.section-heading h2{margin:7px 0 0}.activity-grid{grid-template-columns:1fr 1fr;gap:16px;display:grid}.activity-card{text-align:left;background:var(--panel);width:100%;color:var(--text);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:19px;align-items:center;gap:15px;padding:21px;display:flex}.activity-card:hover,.lesson-row:hover{border-color:var(--accent)}.activity-card>span:nth-child(2){flex:1}.activity-card strong,.lesson-row strong{font-size:15px;display:block}.activity-card small,.lesson-row small{color:var(--muted);margin-top:5px;font-size:12px;display:block}.activity-icon{flex:none;width:53px;height:53px;margin:0}.activity-icon.mint{color:#28795f;background:#e3f3eb}.activity-icon.peach{color:#a8661b;background:#fff0dc}.bottom-nav{display:none}.world-card{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:23px;gap:26px;margin-bottom:18px;padding:28px;display:flex}.world-card.subdued{opacity:.77}.world-number{background:var(--soft);width:62px;height:62px;color:var(--accent);border-radius:17px;flex:none;place-items:center;font-size:23px;font-weight:800;display:grid}.world-copy{flex:1}.world-copy h2{margin:6px 0}.world-copy p{color:var(--muted);margin-bottom:20px}.lesson-row{text-align:left;width:100%;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:15px;align-items:center;gap:15px;padding:14px;display:flex}.lesson-row>span:nth-child(2){flex:1}.lesson-symbol{background:var(--soft);width:46px;height:46px;color:var(--accent);border-radius:13px;place-items:center;font-weight:850;display:grid}.success-icon{color:var(--success)}.coming-soon{color:var(--muted);border:1px solid var(--line);border-radius:30px;padding:8px 11px;font-size:12px}.game-promo{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:25px;align-items:center;gap:36px;padding:clamp(25px,4vw,43px);display:flex}.game-promo-icon{background:var(--soft);width:140px;height:140px;color:var(--accent);border-radius:35px;flex:none;place-items:center;display:grid}.game-promo h2{margin:18px 0 8px}.game-promo p{max-width:550px;color:var(--muted)}.game-promo-meta{color:var(--muted);gap:19px;margin-bottom:21px;font-size:13px;display:flex}.game-promo-meta span{align-items:center;gap:6px;display:flex}.progress-list{background:var(--panel);border:1px solid var(--line);border-radius:20px;overflow:hidden}.progress-item{justify-content:space-between;align-items:center;padding:20px 24px;display:flex}.progress-item+.progress-item{border-top:1px solid var(--line)}.progress-item strong,.progress-item small{display:block}.progress-item small{color:var(--muted);margin-top:4px}.accuracy-label{color:var(--accent);font-weight:800}.last-session{color:var(--muted);align-items:center;gap:12px;margin:18px 0 34px;display:flex}.last-session strong{color:var(--text)}.recommendation{background:var(--soft);border:1px solid var(--line);border-radius:20px;margin-top:33px;padding:28px}.recommendation h2{margin:8px 0}.recommendation p{color:var(--muted)}.settings-card{background:var(--panel);border:1px solid var(--line);border-radius:20px;margin-bottom:16px;padding:26px}.settings-card h2{margin:0 0 4px;font-size:19px}.settings-card p{color:var(--muted);margin:0 0 19px;font-size:14px}.segmented{flex-wrap:wrap;gap:8px;display:flex}.segmented button{border:1px solid var(--line);background:var(--bg);color:var(--text);border-radius:11px;padding:11px 17px;font-size:13px;font-weight:700}.segmented button.selected{background:var(--accent);color:var(--accent-text);border-color:var(--accent)}.capitalize{text-transform:capitalize}.toggle-row{justify-content:space-between;align-items:center;gap:20px;display:flex}.toggle-row strong,.toggle-row small{display:block}.toggle-row small{color:var(--muted);margin-top:4px}.toggle-row input{width:22px;height:22px;accent-color:var(--accent)}.text-button{color:var(--accent);background:0 0;border:0;align-items:center;gap:6px;padding:4px 0;font-weight:750;display:inline-flex}.immersive-shell{max-width:890px;margin:auto;padding:27px 24px 80px}.immersive-shell>.brand{margin-bottom:40px}.flow-page{max-width:700px;margin:auto}.back-link{color:var(--muted);background:0 0;border:0;align-items:center;gap:8px;margin-bottom:31px;padding:6px 0;font-weight:700;display:flex}.back-link:hover{color:var(--accent)}.flow-head{justify-content:space-between;align-items:end;gap:16px;display:flex}.flow-head h1{margin:7px 0 14px;font-size:clamp(1.9rem,5vw,2.8rem)}.flow-head>span{white-space:nowrap;color:var(--muted);margin-bottom:18px;font-weight:700}.progress-track{background:var(--line);border-radius:99px;height:8px;margin-bottom:22px;overflow:hidden}.progress-track span{background:var(--accent);border-radius:99px;height:100%;transition:width .2s;display:block}.lesson-card,.question-card{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:23px;padding:clamp(25px,5vw,43px)}.lesson-step-icon{width:50px;height:50px;margin-bottom:21px}.lesson-card h2{margin:9px 0 12px}.lesson-card p{color:var(--muted)}.equation-box{background:var(--soft);border:1px solid var(--line);color:var(--text);text-align:center;letter-spacing:-.04em;border-radius:15px;margin:22px 0;padding:22px;font-size:clamp(20px,4vw,28px);font-weight:800}.lesson-card form{margin-top:25px}.lesson-card label,.question-card 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span{color:var(--accent)}.result-feedback{text-align:left;background:var(--soft);border-radius:14px;margin-top:23px;padding:17px 20px}.result-feedback p{color:var(--muted);margin:5px 0 0;font-size:14px}.result-feedback.incorrect{border:1px solid var(--line)}.completion-card{text-align:center;background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:25px;padding:clamp(32px,6vw,58px)}.completion-icon{background:var(--soft);width:70px;height:70px;color:var(--accent);border-radius:22px;place-items:center;margin:0 auto 22px;display:grid}.completion-card h1{margin:12px 0;font-size:clamp(2rem,5vw,3rem)}.completion-card p{max-width:500px;color:var(--muted);margin:0 auto 22px}.completion-card .button{width:100%;max-width:350px;margin:12px auto 0;display:flex}.score-number{letter-spacing:-.08em;color:var(--accent);font-size:72px;font-weight:850;line-height:1.2}.score-number span{color:var(--muted);font-size:38px}.onboarding{place-items:center;padding:24px;display:grid}.onboarding-shell{background:var(--panel);border:1px solid var(--line);width:min(100%,690px);box-shadow:var(--shadow);border-radius:27px;padding:clamp(25px,5vw,48px)}.onboarding-shell>.brand{margin-bottom:42px;padding:0}.onboarding-top{justify-content:space-between;align-items:center;gap:10px;display:flex}.steps{gap:7px;margin:18px 0 35px;display:flex}.steps span{background:var(--line);border-radius:99px;flex:1;height:5px}.steps span.active{background:var(--accent)}.onboarding h1{margin:0 0 10px}.lead{color:var(--muted);margin-bottom:26px;font-size:16px}.theme-options{grid-template-columns:repeat(3,1fr);gap:11px;display:grid}.theme-choice{text-align:left;border:2px solid #0000;border-radius:17px;flex-direction:column;align-items:flex-start;gap:6px;min-height:145px;padding:20px 14px;display:flex;position:relative}.theme-choice strong,.theme-choice small{display:block}.theme-choice small{font-size:12px}.theme-choice.selected{border-color:var(--accent)}.theme-preview-explorer{color:#4b351a;background:#fff0d5}.theme-preview-challenger{color:#fff;background:#242b4d}.theme-preview-focus{color:#174c46;background:#e5f3ee}.theme-icon{margin-bottom:10px;font-size:25px}.selected-check{position:absolute;top:11px;right:11px}.stack-options{gap:10px;display:grid}.option-card{background:var(--bg);color:var(--text);border:2px solid var(--line);text-align:left;border-radius:15px;justify-content:space-between;align-items:center;padding:17px;display:flex}.option-card.selected,.goal-choice.selected{border-color:var(--accent);background:var(--soft)}.option-card strong,.option-card small{display:block}.option-card small{color:var(--muted);margin-top:3px;font-size:13px}.goal-options{grid-template-columns:repeat(3,1fr);gap:11px;display:grid}.goal-choice{border:2px solid var(--line);background:var(--bg);color:var(--text);border-radius:17px;flex-direction:column;align-items:center;padding:25px 8px;display:flex}.goal-choice strong{font-size:31px}.goal-choice span{color:var(--muted);font-size:12px}.soft-note{color:var(--muted);align-items:center;gap:10px;margin-top:24px;font-size:13px;display:flex}.onboarding-actions{justify-content:flex-end;gap:11px;margin-top:32px;display:flex}.onboarding-actions .button-ghost{margin-right:auto}.loading-screen{color:#174c46;text-align:center;background:#f8faf9;place-items:center;min-height:100vh;padding:30px;font-weight:700;display:grid}.reduce-motion *,.reduce-motion :before,.reduce-motion :after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}@media(max-width:900px){.sidebar{display:none}.mobile-brand{margin-right:auto;display:flex}.topbar{justify-content:space-between;padding:0 24px}.topbar-greeting{display:none}.page-content{padding:35px 24px 105px}.bottom-nav{z-index:20;background:var(--panel);border-top:1px solid var(--line);padding:8px 4px max(8px,env(safe-area-inset-bottom));justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0}.bottom-nav button{min-width:62px;color:var(--muted);background:0 0;border:0;flex-direction:column;align-items:center;gap:4px;padding:5px 2px;font-size:10px;font-weight:700;display:flex}.bottom-nav button.active{color:var(--accent)}}@media(max-width:620px){.page-content{padding:28px 17px 105px}.page-heading{margin-bottom:22px}.page-heading h1{font-size:2.25rem}.hero-card{min-height:auto;padding:26px}.hero-art{display:none}.stats-grid{gap:9px;margin:13px 0 34px}.stat-card{border-radius:15px;padding:13px}.stat-icon{width:32px;height:32px;margin-bottom:10px}.stat-card strong{font-size:21px}.stat-card small{font-size:11px}.activity-grid{grid-template-columns:1fr;gap:10px}.activity-card{padding:16px}.world-card{gap:14px;padding:18px}.world-number{width:45px;height:45px;font-size:18px}.game-promo{padding:25px;display:block}.game-promo-icon{border-radius:20px;width:70px;height:70px;margin-bottom:20px}.game-promo-icon svg{width:27px}.immersive-shell{padding:19px 16px 60px}.immersive-shell>.brand{margin-bottom:26px}.answer-row{flex-direction:column}.onboarding{padding:13px}.onboarding-shell{border-radius:20px;padding:24px 18px}.onboarding-shell>.brand{margin-bottom:28px}.theme-options{gap:6px}.theme-choice{min-height:135px;padding:15px 8px}.theme-choice strong{font-size:12px}.theme-choice small{font-size:10px}.selected-check{width:14px;top:5px;right:5px}}@media(prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}