/*! tailwindcss v4.2.1 | MIT License | https://tailwindcss.com */
@layer theme{:root,:host{--font-sans:ui-sans-serif, system-ui, 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;--spacing:.25rem;--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,ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring{outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.relative{position:relative}.start{inset-inline-start:var(--spacing)}.table{display:table}}:root{--ink:#15314b;--muted:#61768b;--line:#dce5ee;--paper:#fff;--blue:#2f6fed;--blue-soft:#eaf2ff;--orange:#f07b3f;--yellow:#ffd65a;--shadow:0 22px 60px #1a3d6021}*{box-sizing:border-box}html{scroll-behavior:smooth;background:#f4f8fc}body{color:var(--ink);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;overscroll-behavior-y:none;background:#f4f8fc;margin:0;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Noto Sans CJK SC,Helvetica Neue,Arial,sans-serif}button{color:inherit;font:inherit}button:focus-visible{outline-offset:3px;outline:4px solid #2f6fed47}.loading-screen{background:radial-gradient(circle at 50% 30%,#fff 0,#edf5ff 55%,#e7f5f0 100%);place-content:center;justify-items:center;gap:20px;min-height:100svh;font-weight:800;display:grid}.app-logo{color:#fff;background:linear-gradient(145deg,#3478f6,#275ad1);border-radius:20px;flex:0 0 62px;place-items:center;width:62px;height:62px;display:grid;position:relative;transform:rotate(-3deg);box-shadow:0 10px 24px #2f6fed47,inset 0 1px 1px #ffffff59}.logo-number{font-size:30px;font-weight:950;line-height:1;transform:rotate(3deg)}.logo-plus{color:#15314b;background:var(--yellow);border:2px solid #fff;border-radius:50%;place-items:center;width:20px;height:20px;font-size:13px;font-weight:950;display:grid;position:absolute;bottom:5px;right:8px}.logo-spark{color:#fff2a6;font-size:14px;position:absolute;top:4px;left:7px}.map-shell{min-height:100svh;overflow:hidden}.hero{min-height:610px;padding:calc(24px + env(safe-area-inset-top)) max(24px, env(safe-area-inset-right)) 115px max(24px, env(safe-area-inset-left));color:#fff;background:radial-gradient(circle at 82% 18%,#ffdd705c,#0000 16%),radial-gradient(circle at 10% 72%,#78e0cd4d,#0000 24%),linear-gradient(135deg,#1d55c8 0%,#3478f5 55%,#3b8bef 100%);position:relative;overflow:hidden}.hero:before,.hero:after{content:"";border:1px solid #ffffff29;border-radius:50%;position:absolute}.hero:before{width:520px;height:520px;top:-260px;right:-260px}.hero:after{width:280px;height:280px;bottom:30px;left:-140px}.hero-nav{z-index:2;justify-content:space-between;align-items:center;gap:24px;width:min(1180px,100%);margin:0 auto;display:flex;position:relative}.brand{align-items:center;gap:14px;display:flex}.brand .app-logo{border-radius:17px;flex-basis:54px;width:54px;height:54px;box-shadow:0 10px 24px #03205e40}.brand strong,.brand span{display:block}.brand strong{letter-spacing:.02em;font-size:20px;font-weight:950}.brand span{color:#ffffffc7;margin-top:2px;font-size:12px;font-weight:700}.nav-actions{gap:10px;display:flex}.nav-actions button{color:#fff;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);cursor:pointer;background:#ffffff1f;border:1px solid #ffffff70;border-radius:14px;min-height:44px;padding:0 18px;font-weight:850}.nav-actions button:first-child{color:#193553;background:#ffdf72;border-color:#ffdf72}.nav-actions button:active{transform:translateY(1px)}.hero-content{z-index:2;grid-template-columns:minmax(0,1fr) 300px;align-items:center;gap:90px;width:min(1080px,100%);margin:92px auto 0;display:grid;position:relative}.eyebrow{color:#fff2b5;letter-spacing:.04em;background:#00185a26;border:1px solid #ffffff42;border-radius:999px;align-items:center;min-height:34px;padding:0 14px;font-size:13px;font-weight:850;display:inline-flex}.hero h1{letter-spacing:-.045em;max-width:720px;margin:22px 0 18px;font-size:clamp(38px,5.2vw,66px);font-weight:950;line-height:1.08}.hero-copy>p{color:#ffffffd1;max-width:690px;margin:0;font-size:18px;font-weight:600;line-height:1.8}.hero-stats{align-items:center;gap:0;margin-top:34px;display:flex}.hero-stats>div{border-left:1px solid #ffffff38;min-width:112px;padding:0 28px}.hero-stats>div:first-child{border-left:0;padding-left:0}.hero-stats strong,.hero-stats span{display:block}.hero-stats strong{font-size:28px;font-weight:950}.hero-stats span{color:#ffffffad;margin-top:3px;font-size:12px;font-weight:750}.progress-orbit{background:conic-gradient(#ffdc67 var(--progress), #ffffff24 0);border-radius:50%;place-items:center;width:245px;height:245px;display:grid;position:relative;box-shadow:0 28px 50px #072a6e40}.progress-orbit:before{content:"";border-radius:inherit;background:linear-gradient(150deg,#2d69df,#1f56c3);position:absolute;inset:13px;box-shadow:inset 0 0 0 1px #ffffff29}.progress-orbit>div{z-index:1;text-align:center;position:relative}.progress-orbit span,.progress-orbit strong,.progress-orbit small{display:block}.progress-orbit span{color:#cde0ff;font-size:13px;font-weight:800}.progress-orbit strong{color:#ffdf72;margin:4px 0;font-size:48px;font-weight:950;line-height:1}.progress-orbit small{color:#ffffffb3;font-weight:750}.hero-wave{z-index:1;background:#f4f8fc;border-radius:48% 52% 0 0/45% 45% 0 0;height:150px;position:absolute;bottom:-74px;left:-4%;right:-4%;transform:rotate(-1.8deg)}.journey{width:min(1180px,100% - 40px);margin:18px auto 0;padding:50px 0 100px}.section-heading{justify-content:space-between;align-items:end;gap:36px;margin-bottom:36px;display:flex}.section-heading>div>span{color:var(--blue);letter-spacing:.12em;font-size:13px;font-weight:900}.section-heading h2{letter-spacing:-.035em;margin:8px 0 0;font-size:clamp(28px,4vw,42px);font-weight:950;line-height:1.15}.section-heading>p{max-width:430px;color:var(--muted);margin:0;font-size:14px;font-weight:650;line-height:1.8}.chapter-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px;display:grid}.chapter-card{background:#fff;border:1px solid #18375114;border-radius:28px;min-height:332px;padding:28px 28px 24px;position:relative;overflow:hidden;box-shadow:0 18px 55px #18375114}.chapter-card:before{content:"";background:var(--chapter-soft);border-radius:50%;width:210px;height:210px;position:absolute;top:-100px;right:-95px}.chapter-card.locked{filter:saturate(.25);opacity:.68}.chapter-number{color:var(--chapter);position:absolute;top:20px;right:28px}@supports (color:color-mix(in lab, red, red)){.chapter-number{color:color-mix(in srgb, var(--chapter) 18%, transparent)}}.chapter-number{letter-spacing:-.08em;font-size:62px;font-weight:950;line-height:1}.chapter-intro{z-index:1;grid-template-columns:58px 1fr auto;align-items:center;gap:14px;display:grid;position:relative}.chapter-icon{border:1px solid var(--chapter);place-items:center;width:58px;height:58px;display:grid}@supports (color:color-mix(in lab, red, red)){.chapter-icon{border:1px solid color-mix(in srgb, var(--chapter) 16%, white)}}.chapter-icon{background:var(--chapter-soft);border-radius:18px;font-size:28px}.chapter-intro span{color:var(--chapter);letter-spacing:.05em;font-size:11px;font-weight:850}.chapter-intro h3{margin:4px 0 0;font-size:21px;font-weight:950}.chapter-count{min-width:48px;height:34px;color:var(--chapter);background:var(--chapter-soft);border-radius:999px;place-items:center;font-size:12px;font-weight:900;display:grid}.level-path{z-index:1;margin-top:24px;position:relative}.path-stop{padding-bottom:10px;position:relative}.path-stop:last-child{padding-bottom:0}.path-line{z-index:-1;border-left:2px dashed var(--chapter);width:2px;position:absolute;top:48px;bottom:-3px;left:24px}@supports (color:color-mix(in lab, red, red)){.path-line{border-left:2px dashed color-mix(in srgb, var(--chapter) 28%, #dce5ee)}}.level-node{text-align:left;cursor:pointer;background:0 0;border:1px solid #0000;border-radius:17px;grid-template-columns:42px 1fr auto;align-items:center;gap:10px;width:100%;min-height:58px;padding:8px 12px 8px 7px;transition:transform .18s,border-color .18s,background .18s;display:grid}.level-node:not(.locked):hover{border-color:var(--chapter)}@supports (color:color-mix(in lab, red, red)){.level-node:not(.locked):hover{border-color:color-mix(in srgb, var(--chapter) 24%, white)}}.level-node:not(.locked):hover{background:var(--chapter-soft);transform:translate(3px)}.level-node.complete{background:var(--chapter-soft)}@supports (color:color-mix(in lab, red, red)){.level-node.complete{background:color-mix(in srgb, var(--chapter-soft) 68%, white)}}.level-node.locked{cursor:not-allowed;opacity:.55}.node-number{border:2px solid var(--chapter);place-items:center;width:42px;height:42px;display:grid}@supports (color:color-mix(in lab, red, red)){.node-number{border:2px solid color-mix(in srgb, var(--chapter) 30%, white)}}.node-number{color:var(--chapter);background:#fff;border-radius:14px;font-size:13px;font-weight:950;box-shadow:0 6px 14px #16334a14}.level-node.complete .node-number{color:#fff;border-color:var(--chapter);background:var(--chapter)}.node-copy small,.node-copy strong{display:block}.node-copy small{color:var(--muted);font-size:10px;font-weight:750}.node-copy strong{margin-top:2px;font-size:14px;font-weight:900}.chapter-badge{z-index:2;color:var(--chapter);background:var(--chapter-soft);border-radius:999px;padding:7px 12px;font-size:10px;font-weight:900;position:absolute;bottom:16px;right:20px}.star-row{gap:4px;display:inline-flex}.star{color:#dce4eb;text-shadow:0 1px #c8d3dc;font-size:28px;line-height:1}.star.on{color:#ffc928;text-shadow:0 2px #dc9814}.star-row.small{gap:1px}.star-row.small .star{font-size:13px}.method-band{padding:82px max(24px, env(safe-area-inset-right)) 86px max(24px, env(safe-area-inset-left));color:#fff;background:#173550}.method-copy,.method-steps{width:min(1120px,100%);margin-left:auto;margin-right:auto}.method-copy{justify-content:space-between;align-items:end;gap:30px;display:flex}.method-copy span{color:#74d5c4;letter-spacing:.08em;font-size:13px;font-weight:900}.method-copy h2{letter-spacing:-.03em;text-align:right;max-width:700px;margin:0;font-size:clamp(27px,4vw,42px);font-weight:950;line-height:1.2}.method-steps{grid-template-columns:repeat(4,1fr);gap:14px;margin-top:50px;display:grid}.method-step{background:#ffffff0f;border:1px solid #ffffff1c;border-radius:20px;min-height:132px;padding:22px}.method-step>span{color:#173550;background:#ffda64;border-radius:9px;place-items:center;width:30px;height:30px;font-size:12px;font-weight:950;display:grid}.method-step strong,.method-step small{display:block}.method-step strong{margin-top:14px;font-size:16px;font-weight:900}.method-step small{color:#ffffff9e;margin-top:5px;font-size:12px;line-height:1.5}footer{padding:42px max(24px, env(safe-area-inset-right)) calc(42px + env(safe-area-inset-bottom)) max(24px, env(safe-area-inset-left));text-align:center;background:#10293f;justify-items:center;display:grid}footer .app-logo{border-radius:15px;flex-basis:48px;width:48px;height:48px}footer p{color:#fff;margin:16px 0 5px;font-size:13px;font-weight:850}footer>span{color:#ffffff75;font-size:10px}.game-shell{min-height:100svh;padding:calc(16px + env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) calc(44px + env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));background:radial-gradient(circle at 50% 0, var(--chapter-soft), transparent 420px), #f4f8fc}.level-topbar{grid-template-columns:52px 1fr auto;align-items:center;gap:14px;width:min(980px,100%);min-height:66px;margin:0 auto;display:grid}.icon-button{border:1px solid var(--line);width:48px;height:48px;color:var(--ink);cursor:pointer;background:#fff;border-radius:15px;font-size:25px;font-weight:900;box-shadow:0 8px 18px #14334b14}.level-heading span,.level-heading strong{display:block}.level-heading span{color:var(--chapter);font-size:12px;font-weight:850}.level-heading strong{margin-top:2px;font-size:17px;font-weight:950}.top-stars{color:#6e4e00;background:#ffdf72;border-radius:14px;justify-content:center;align-items:center;gap:6px;min-width:74px;height:42px;padding:0 14px;display:flex;box-shadow:0 8px 18px #d59a192e}.top-stars span{color:#f3a913}.level-progress{background:#dfe7ee;border-radius:99px;width:min(980px,100%);height:7px;margin:14px auto 24px;overflow:hidden}.level-progress span{border-radius:inherit;background:var(--chapter);height:100%;transition:width .35s;display:block}.learning-steps{grid-template-columns:repeat(4,1fr);gap:8px;width:min(760px,100%);margin:0 auto 18px;display:grid}.learning-steps>span{color:#748797;background:#ffffffc2;border:1px solid #dfe7ee;border-radius:17px;grid-template-rows:auto auto;grid-template-columns:30px 1fr;align-items:center;column-gap:7px;min-height:72px;padding:10px 8px;display:grid}.learning-steps b{color:#6f8291;background:#edf2f6;border-radius:10px;grid-row:1/3;place-items:center;width:30px;height:30px;font-size:12px;font-weight:950;display:grid}.learning-steps em,.learning-steps small{font-style:normal;display:block}.learning-steps em{align-self:end;font-size:12px;font-weight:900}.learning-steps small{align-self:start;font-size:9px;font-weight:700}.learning-steps>span.active{border-color:var(--chapter)}@supports (color:color-mix(in lab, red, red)){.learning-steps>span.active{border-color:color-mix(in srgb, var(--chapter) 48%, white)}}.learning-steps>span.active{color:var(--chapter);box-shadow:0 8px 22px var(--chapter);background:#fff}@supports (color:color-mix(in lab, red, red)){.learning-steps>span.active{box-shadow:0 8px 22px color-mix(in srgb, var(--chapter) 13%, transparent)}}.learning-steps>span.active b{color:#fff;background:var(--chapter)}.learning-steps>span.done{color:#347d50;background:#edf8f0}.learning-steps>span.done b{color:#fff;background:#4f9a61}.challenge-card{width:min(980px,100%);box-shadow:var(--shadow);background:#fff;border:1px solid #18375114;border-radius:30px;margin:0 auto;padding:clamp(24px,4vw,42px)}.challenge-kicker{justify-content:space-between;align-items:center;gap:20px;display:flex}.challenge-kicker>span{color:var(--chapter);background:var(--chapter-soft);border-radius:999px;padding:7px 12px;font-size:11px;font-weight:900}.challenge-card h1{letter-spacing:-.025em;max-width:820px;margin:20px 0 10px;font-size:clamp(24px,4vw,37px);font-weight:950;line-height:1.35}.instruction{color:var(--muted);margin:0;font-size:14px;font-weight:650;line-height:1.7}.coaching-card{max-width:760px}.concept-demo{border:1px solid var(--chapter);margin-top:24px;overflow:hidden}@supports (color:color-mix(in lab, red, red)){.concept-demo{border:1px solid color-mix(in srgb, var(--chapter) 22%, #dce6ee)}}.concept-demo{background:#f8fbfd;border-radius:22px}.concept-demo>header{background:#fff;border-bottom:1px solid #e4ebf0;justify-content:space-between;align-items:center;gap:12px;min-height:64px;padding:12px 15px;display:flex}.concept-demo>header span,.concept-demo>header strong{display:block}.concept-demo>header span{color:var(--chapter);letter-spacing:.08em;font-size:9px;font-weight:950}.concept-demo>header strong{margin-top:3px;font-size:13px;font-weight:900;line-height:1.35}.concept-demo>header button{color:#526a7a;cursor:pointer;background:#f4f7f9;border:1px solid #d7e2e9;border-radius:11px;min-width:72px;min-height:36px;font-size:11px;font-weight:850}.concept-demo>p{color:#526a7a;background:#fff;margin:0;padding:12px 15px 14px;font-size:11px;font-weight:750;line-height:1.55}.demo-stage{background:radial-gradient(circle at 20% 10%, var(--chapter-soft), transparent 160px), linear-gradient(145deg, #f7fbfd, #edf4f7);height:230px;position:relative;overflow:hidden}@supports (color:color-mix(in lab, red, red)){.demo-stage{background:radial-gradient(circle at 20% 10%, color-mix(in srgb, var(--chapter-soft) 70%, white), transparent 160px), linear-gradient(145deg, #f7fbfd, #edf4f7)}}.observation-visual{width:100%;height:100%;position:relative}.demo-object-box{width:130px;height:92px;position:absolute;top:50%;left:50%;transform:translate(-50%,-45%)}.demo-object-box span{color:#fff;place-items:center;font-size:31px;font-weight:950;display:grid;position:absolute;box-shadow:inset 0 0 0 2px #ffffff52}.box-front{background:#2f6fed;border-radius:8px 2px 4px 8px;width:92px;height:70px;top:22px;left:0}.box-side{clip-path:polygon(0 18%,100% 0,100% 82%,0 100%);background:#1f4eaa;width:39px;height:70px;top:9px;right:0}.box-top{clip-path:polygon(0 82%,70% 0,100% 35%,30% 100%);background:#6e9cff;width:128px;height:27px;top:0;left:0;font-size:20px!important}.moving-eye{filter:drop-shadow(0 8px 8px #1f3d5329);font-size:28px;animation:6s ease-in-out both observation-eye;position:absolute;top:54%;left:calc(50% - 150px)}.view-callouts b{text-align:center;color:#24445a;opacity:0;background:#fff;border-radius:999px;min-width:110px;padding:7px 12px;font-size:11px;font-weight:900;position:absolute;bottom:14px;left:50%;transform:translate(-50%);box-shadow:0 7px 20px #14354c1f}.view-callouts b:first-child{animation:6s both demo-label-one}.view-callouts b:nth-child(2){animation:6s both demo-label-two}.view-callouts b:nth-child(3){animation:6s both demo-label-three}.operation-visual{align-content:center;justify-items:center;height:100%;padding:26px 18px 16px;display:grid}.operation-expression{align-items:center;gap:4px;font-size:clamp(27px,7vw,42px);font-weight:950;display:flex}.operation-expression b{border-radius:10px;padding:4px 8px;animation:5.8s both operation-highlight}.operation-steps{flex-wrap:wrap;justify-content:center;gap:8px;margin-top:20px;display:flex}.operation-steps span,.operation-answer{opacity:0;background:#fff;border-radius:11px;padding:8px 12px;font-size:12px;font-weight:900;box-shadow:0 6px 18px #14354c1a}.operation-steps span:first-child{animation:5.8s both operation-step-one}.operation-steps span:last-child{animation:5.8s both operation-step-two}.operation-answer{color:#287344;background:#eaf8ee;margin-top:9px;animation:5.8s both operation-answer}.measure-visual{height:100%;padding:48px 25px 18px;position:relative}.demo-pencil{z-index:2;font-size:34px;animation:5.8s ease-in-out both pencil-measure;position:absolute;top:42px;left:18%;transform:rotate(-8deg)}.demo-ruler{background:#fff4b7;border:2px solid #d4a848;border-radius:9px;grid-template-columns:repeat(11,1fr);height:74px;margin-top:40px;display:grid;position:relative}.demo-ruler i{border-left:1px solid #5b42117a;position:relative}.demo-ruler i:first-child{border-left:0}.demo-ruler i:before{content:"";background:#5b421147;width:1px;height:18px;position:absolute;top:0;left:20%;box-shadow:6px 0 #5b421147,12px 0 #5b421147}.demo-ruler i span{color:#654d1c;font-size:9px;font-style:normal;font-weight:800;position:absolute;bottom:7px;left:0;transform:translate(-50%)}.measure-start,.measure-end{color:#fff;border-radius:8px;place-items:center;width:28px;height:24px;font-size:11px;display:grid;position:absolute;top:-28px}.measure-start{background:#2f6fed;left:20%}.measure-end{background:#e46d47;left:90%}.measure-length{color:#0000;transform-origin:0;background:#46a66a;border-radius:99px;width:70%;height:5px;animation:5.8s both measure-grow;position:absolute;top:-10px;left:20%}.measure-length:after{content:"7厘米";color:#31744a;font-size:11px;font-style:normal;font-weight:900;position:absolute;top:-22px;left:50%;transform:translate(-50%)}.measure-formula{text-align:center;color:#2a7046;opacity:0;margin-top:14px;font-size:16px;font-weight:950;animation:5.8s both demo-result-in}.caochong-visual{background:linear-gradient(#edf9ff 0 57%,#93d8ee 57% 100%);height:100%;position:relative}.waterline{z-index:1;border-top:3px dashed #176f94;position:absolute;top:58%;left:8%;right:8%}.waterline span{color:#176f94;font-size:10px;font-weight:900;position:absolute;top:-23px;right:0}.demo-boat{z-index:2;background:#ad6735;border-radius:8px 8px 80px 80px;width:210px;height:58px;animation:5.8s ease-in-out both boat-float;position:absolute;top:43%;left:50%;transform:translate(-50%,-50%);box-shadow:inset 0 -12px #66351733}.boat-cargo{white-space:nowrap;position:absolute;bottom:39px;left:50%;transform:translate(-50%)}.elephant-cargo{font-size:53px;animation:5.8s both elephant-swap}.stone-cargo{opacity:0;font-size:25px;animation:5.8s both stone-swap}.cargo-labels b{color:#315568;opacity:0;background:#fff;border-radius:10px;padding:6px 10px;font-size:10px;position:absolute;top:14px;left:50%;transform:translate(-50%);box-shadow:0 5px 16px #1d465b1c}.cargo-labels b:first-child{animation:5.8s both cargo-one}.cargo-labels b:last-child{animation:5.8s both cargo-two}.equal-mass{color:#235c3a;opacity:0;background:#eaf8ee;border-radius:999px;padding:7px 12px;font-size:11px;font-weight:950;animation:5.8s both demo-result-in;position:absolute;bottom:12px;left:50%;transform:translate(-50%)}.multiply-visual{grid-template-columns:150px 1fr;justify-content:center;align-items:center;gap:26px;height:100%;padding:18px 30px;display:grid}.vertical-math{background:#fff;border-radius:18px;width:140px;padding:12px 22px;position:relative;box-shadow:0 10px 26px #14354c1a}.vertical-math>div{text-align:center;grid-template-columns:repeat(3,1fr);font-size:25px;font-weight:950;display:grid}.vertical-math .times-row{margin-top:4px;font-size:20px}.vertical-math hr{border:0;border-top:2px solid #293f4f;margin:5px 0 6px}.multiply-result span{opacity:0}.multiply-result span:nth-child(3){animation:5.8s both multiply-ones}.multiply-result span:nth-child(2){animation:5.8s both multiply-tens}.multiply-result span:first-child{animation:5.8s both multiply-hundreds}.carry-one{color:#df6949;opacity:0;font-size:12px;animation:5.8s both carry-show;position:absolute;top:3px;right:49px}.multiply-steps{gap:8px;display:grid}.multiply-steps span{opacity:0;background:#fff;border-radius:11px;padding:9px 12px;font-size:11px;font-weight:850;box-shadow:0 6px 16px #14354c17}.multiply-steps span:first-child{animation:5.8s both multiply-step-one}.multiply-steps span:nth-child(2){animation:5.8s both multiply-step-two}.multiply-steps span:nth-child(3){animation:5.8s both multiply-step-three}.code-visual{align-content:center;justify-items:center;height:100%;display:grid}.code-parts{gap:12px;display:flex}.code-parts>span{color:#fff;border-radius:15px;justify-items:center;min-width:76px;padding:12px;display:grid;box-shadow:0 9px 22px #14354c1f}.code-parts>span:first-child{background:#2f6fed;animation:5.8s both code-part-one}.code-parts>span:nth-child(2){background:#159a8c;animation:5.8s both code-part-two}.code-parts>span:nth-child(3){background:#d78536;animation:5.8s both code-part-three}.code-parts b{font-size:24px;font-weight:950}.code-parts small{margin-top:3px;font-size:9px;font-weight:800}.code-joins{color:#496171;opacity:0;margin-top:13px;font-size:13px;font-weight:850;animation:5.8s both code-join}.code-joins i{border-left:2px dashed #9db0bd;height:18px;margin:0 6px -5px;display:inline-block}.code-result{color:#23465c;letter-spacing:.08em;opacity:0;margin-top:10px;font-size:35px;font-weight:950;animation:5.8s both demo-result-in}.angle-visual{height:100%;position:relative}.angle-origin{z-index:3;background:#2e74bb;border:5px solid #fff;border-radius:50%;width:16px;height:16px;position:absolute;top:62%;left:40%;transform:translate(-50%,-50%);box-shadow:0 4px 12px #14354c33}.angle-ray{transform-origin:0;background:#2e74bb;border-radius:99px;width:150px;height:7px;position:absolute;top:62%;left:40%}.fixed-ray{transform:rotate(0)}.moving-ray{background:#ef7a48;animation:6s ease-in-out both angle-open}.angle-labels b{color:#355265;opacity:0;background:#fff;border-radius:999px;padding:7px 13px;font-size:11px;position:absolute;top:14px;left:50%;transform:translate(-50%);box-shadow:0 6px 18px #14354c1a}.angle-labels b:first-child{animation:6s both demo-label-one}.angle-labels b:nth-child(2){animation:6s both demo-label-two}.angle-labels b:nth-child(3){animation:6s both demo-label-three}.angle-rule{color:#2b6a44;opacity:0;font-size:12px;font-weight:950;animation:6s both demo-result-in;position:absolute;bottom:14px;left:50%;transform:translate(-50%)}.fraction-visual{align-content:center;justify-items:center;height:100%;display:grid}.fraction-strip{grid-template-columns:repeat(8,1fr);gap:4px;width:min(440px,88%);display:grid}.fraction-strip span{aspect-ratio:1;color:#a94a55;background:#fff;border:2px solid #cf5964;border-radius:8px;place-items:center;font-size:10px;font-weight:850;display:grid}.fraction-strip .filled{color:#fff;background:#cf5964;animation:5.8s both fraction-fill}.fraction-strip .filled:nth-child(2){animation-delay:.35s}.fraction-strip .filled:nth-child(3){animation-delay:.7s}.fraction-count{color:#526a7a;opacity:0;align-items:center;gap:9px;margin-top:15px;font-size:11px;animation:5.8s both fraction-count;display:flex}.fraction-number{color:#b94755;opacity:0;justify-items:center;margin-top:10px;font-size:25px;font-weight:950;animation:5.8s both demo-result-in;display:grid}.fraction-number i{border-top:3px solid;width:36px}@keyframes observation-eye{0%,25%{top:54%;left:calc(50% - 150px);transform:rotate(0)}38%,62%{top:46%;left:calc(50% + 125px);transform:rotate(0)}76%,to{top:2%;left:calc(50% - 10px);transform:rotate(90deg)}}@keyframes demo-label-one{0%,3%{opacity:0}8%,28%{opacity:1}34%,to{opacity:0}}@keyframes demo-label-two{0%,34%{opacity:0}40%,61%{opacity:1}67%,to{opacity:0}}@keyframes demo-label-three{0%,68%{opacity:0}74%,to{opacity:1}}@keyframes operation-highlight{0%,6%{color:inherit;box-shadow:none;background:0 0}12%,44%{color:#9f4e21;background:#ffe5d4;box-shadow:0 0 0 4px #f07b3f21}54%,to{color:inherit;box-shadow:none;background:0 0}}@keyframes operation-step-one{0%,13%{opacity:0;transform:translateY(8px)}20%,to{opacity:1;transform:translateY(0)}}@keyframes operation-step-two{0%,48%{opacity:0;transform:translateY(8px)}57%,to{opacity:1;transform:translateY(0)}}@keyframes operation-answer{0%,73%{opacity:0;transform:scale(.9)}82%,to{opacity:1;transform:scale(1)}}@keyframes pencil-measure{0%,15%{left:18%}38%,to{left:80%}}@keyframes measure-grow{0%,31%{opacity:0;transform:scaleX(0)}44%,to{opacity:1;transform:scaleX(1)}}@keyframes boat-float{0%,to{transform:translate(-50%,-50%)rotate(-1deg)}25%{transform:translate(-50%,-48%)rotate(1deg)}60%{transform:translate(-50%,-50%)rotate(-1deg)}}@keyframes elephant-swap{0%,40%{opacity:1;transform:translate(-50%)scale(1)}49%,to{opacity:0;transform:translate(-50%)scale(.8)}}@keyframes stone-swap{0%,48%{opacity:0;transform:translate(-50%)scale(.8)}58%,to{opacity:1;transform:translate(-50%)scale(1)}}@keyframes cargo-one{0%,8%{opacity:0}14%,39%{opacity:1}46%,to{opacity:0}}@keyframes cargo-two{0%,50%{opacity:0}59%,to{opacity:1}}@keyframes demo-result-in{0%,74%{opacity:0;transform:translateY(7px)}84%,to{opacity:1;transform:translateY(0)}}@keyframes multiply-ones{0%,17%{opacity:0;transform:scale(.5)}24%,to{opacity:1;transform:scale(1)}}@keyframes multiply-tens{0%,43%{opacity:0;transform:scale(.5)}51%,to{opacity:1;transform:scale(1)}}@keyframes multiply-hundreds{0%,67%{opacity:0;transform:scale(.5)}75%,to{opacity:1;transform:scale(1)}}@keyframes carry-show{0%,16%{opacity:0;transform:translateY(5px)}23%,47%{opacity:1;transform:translateY(0)}56%,to{opacity:0}}@keyframes multiply-step-one{0%,14%{opacity:0}22%,to{opacity:1}}@keyframes multiply-step-two{0%,40%{opacity:0}49%,to{opacity:1}}@keyframes multiply-step-three{0%,65%{opacity:0}74%,to{opacity:1}}@keyframes code-part-one{0%{opacity:0;transform:translate(-30px)}18%,to{opacity:1;transform:translate(0)}}@keyframes code-part-two{0%,15%{opacity:0;transform:translateY(-22px)}31%,to{opacity:1;transform:translateY(0)}}@keyframes code-part-three{0%,29%{opacity:0;transform:translate(30px)}46%,to{opacity:1;transform:translate(0)}}@keyframes code-join{0%,49%{opacity:0}61%,to{opacity:1}}@keyframes angle-open{0%,25%{transform:rotate(-35deg)}38%,62%{transform:rotate(-90deg)}76%,to{transform:rotate(-130deg)}}@keyframes fraction-fill{0%,12%{color:#a94a55;background:#fff;transform:scale(.86)}22%,to{color:#fff;background:#cf5964;transform:scale(1)}}@keyframes fraction-count{0%,48%{opacity:0;transform:translateY(7px)}58%,to{opacity:1;transform:translateY(0)}}.stage-emoji{background:var(--chapter-soft);border-radius:23px;place-items:center;width:72px;height:72px;margin-top:26px;font-size:38px;display:grid}.stage-intro{color:var(--muted);margin:0;font-size:14px;font-weight:650;line-height:1.7}.prompt-card,.materials-card{border:1px solid var(--chapter);margin-top:24px;padding:20px}@supports (color:color-mix(in lab, red, red)){.prompt-card,.materials-card{border:1px solid color-mix(in srgb, var(--chapter) 22%, #dce6ee)}}.prompt-card,.materials-card{background:var(--chapter-soft);border-radius:20px}@supports (color:color-mix(in lab, red, red)){.prompt-card,.materials-card{background:color-mix(in srgb, var(--chapter-soft) 52%, white)}}.prompt-card>span,.materials-card>span,.sentence-starter>span,.keyword-note>span{color:var(--chapter);letter-spacing:.08em;font-size:10px;font-weight:950;display:block}.prompt-card strong{margin-top:8px;font-size:clamp(18px,3vw,24px);font-weight:900;line-height:1.55;display:block}.action-prompt strong,.explain-prompt strong{font-size:clamp(16px,2.6vw,21px)}.sentence-starter{border-left:4px solid var(--chapter);background:#f5f8fb;border-radius:0 15px 15px 0;margin-top:14px;padding:15px 18px}.sentence-starter p{color:#425868;margin:6px 0 0;font-size:14px;font-weight:750;line-height:1.65}.keyword-note{margin-top:18px;display:block}.keyword-note textarea{resize:vertical;width:100%;color:var(--ink);font:inherit;background:#fbfcfd;border:1px solid #d8e3eb;border-radius:14px;outline:0;margin-top:8px;padding:13px 15px;font-size:14px;line-height:1.5}.keyword-note textarea:focus{border-color:var(--chapter);box-shadow:0 0 0 3px var(--chapter)}@supports (color:color-mix(in lab, red, red)){.keyword-note textarea:focus{box-shadow:0 0 0 3px color-mix(in srgb, var(--chapter) 12%, transparent)}}.privacy-note,.safety-note{color:var(--muted);margin:13px 0 0;font-size:10px;font-weight:700;line-height:1.6}.materials-card>div{flex-wrap:wrap;gap:8px;margin-top:10px;display:flex}.materials-card b{color:#375261;background:#fff;border-radius:11px;padding:8px 11px;font-size:12px;font-weight:850;box-shadow:0 4px 12px #17344a12}.time-chip,.answer-correct{color:#347d50!important;background:#eaf7ed!important}.stage-actions{grid-template-columns:minmax(130px,.55fr) minmax(220px,1.45fr);gap:10px;margin-top:24px;display:grid}.stage-button,.secondary-stage-button{cursor:pointer;border-radius:17px;min-height:56px;font-size:14px;font-weight:950}.stage-button{color:#fff;background:var(--chapter);width:100%;box-shadow:0 12px 24px var(--chapter);border:0;margin-top:24px}@supports (color:color-mix(in lab, red, red)){.stage-button{box-shadow:0 12px 24px color-mix(in srgb, var(--chapter) 24%, transparent)}}.stage-actions .stage-button{margin-top:0}.secondary-stage-button{color:#5b7080;background:#f5f8fa;border:1px solid #d7e1e9}.under-link{color:var(--muted);cursor:pointer;background:0 0;border:0;margin:12px auto 0;font-size:11px;font-weight:800;display:block}.drag-game{margin-top:30px}.token-pool{border:1px dashed var(--chapter);padding:18px}@supports (color:color-mix(in lab, red, red)){.token-pool{border:1px dashed color-mix(in srgb, var(--chapter) 42%, #d8e3ec)}}.token-pool{background:var(--chapter-soft);border-radius:20px}@supports (color:color-mix(in lab, red, red)){.token-pool{background:color-mix(in srgb, var(--chapter-soft) 58%, white)}}.pool-title{justify-content:space-between;align-items:center;gap:15px;margin-bottom:14px;display:flex}.pool-title span{color:var(--chapter);font-size:12px;font-weight:900}.pool-title button{color:var(--muted);cursor:pointer;background:0 0;border:0;padding:5px 8px;font-size:11px;font-weight:750}.token-list{flex-wrap:wrap;align-items:center;gap:10px;min-height:54px;display:flex}.drag-token{border:2px solid var(--chapter);align-items:center;gap:8px;min-height:50px;padding:0 17px 0 11px;display:inline-flex}@supports (color:color-mix(in lab, red, red)){.drag-token{border:2px solid color-mix(in srgb, var(--chapter) 35%, white)}}.drag-token{color:var(--ink);cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none;background:#fff;border-radius:15px;font-size:14px;font-weight:850;transition:transform .15s,border-color .15s,box-shadow .15s;box-shadow:0 7px 15px #19395314}.drag-token:active{cursor:grabbing;transform:scale(1.03)}.drag-token.selected{border-color:var(--chapter);box-shadow:0 0 0 4px var(--chapter)}@supports (color:color-mix(in lab, red, red)){.drag-token.selected{box-shadow:0 0 0 4px color-mix(in srgb, var(--chapter) 14%, transparent)}}.grip{color:var(--chapter);font-size:20px}.pool-empty{color:var(--muted);font-size:12px;font-weight:750}.drop-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:16px;display:grid}.drop-zone{text-align:left;cursor:pointer;background:#fff;border:2px solid #dfe7ee;border-radius:19px;flex-direction:column;align-items:stretch;min-height:142px;padding:16px;transition:border-color .16s,transform .16s,background .16s;display:flex}.drop-zone:hover{border-color:var(--chapter)}@supports (color:color-mix(in lab, red, red)){.drop-zone:hover{border-color:color-mix(in srgb, var(--chapter) 38%, white)}}.drop-zone:hover{background:var(--chapter-soft)}@supports (color:color-mix(in lab, red, red)){.drop-zone:hover{background:color-mix(in srgb, var(--chapter-soft) 38%, white)}}.drop-zone>strong{color:var(--chapter);font-size:14px;font-weight:950}.drop-zone>small{color:var(--muted);margin-top:3px;font-size:10px;font-weight:650}.zone-items{background:#f6f8fa;border-radius:12px;flex-direction:column;flex:1;justify-content:center;gap:6px;margin-top:12px;padding:8px;display:flex}.zone-items em{color:#9aabba;text-align:center;font-size:11px;font-style:normal;font-weight:700}.placed-token{border:1px solid var(--chapter);padding:9px 10px}@supports (color:color-mix(in lab, red, red)){.placed-token{border:1px solid color-mix(in srgb, var(--chapter) 24%, white)}}.placed-token{color:var(--ink);background:var(--chapter-soft);border-radius:10px;font-size:12px;font-weight:850;line-height:1.35}.drag-ghost{z-index:100;border:2px solid var(--chapter);color:var(--ink);pointer-events:none;background:#fff;border-radius:14px;padding:13px 18px;font-size:14px;font-weight:900;position:fixed;transform:translate(-50%,-115%)rotate(-2deg);box-shadow:0 18px 42px #122d4438}.choice-grid{gap:12px;margin-top:28px;display:grid}.choice-card{text-align:left;cursor:pointer;background:#fff;border:2px solid #e1e8ef;border-radius:18px;grid-template-columns:24px 1fr;align-items:center;column-gap:12px;width:100%;min-height:76px;padding:15px 18px;transition:border-color .16s,background .16s,transform .16s;display:grid}.choice-card:hover{border-color:var(--chapter);transform:translateY(-1px)}@supports (color:color-mix(in lab, red, red)){.choice-card:hover{border-color:color-mix(in srgb, var(--chapter) 34%, white)}}.choice-card.selected{border-color:var(--chapter);background:var(--chapter-soft)}.choice-dot{background:#fff;border:2px solid #b9c6d2;border-radius:50%;grid-row:1/3;width:21px;height:21px}.choice-card.selected .choice-dot{border:6px solid var(--chapter)}.choice-card strong{font-size:15px;font-weight:900}.choice-card small{color:var(--muted);margin-top:3px;font-size:11px;font-weight:650}.feedback{border-radius:14px;align-items:center;gap:10px;min-height:52px;margin-top:18px;padding:12px 14px;font-size:13px;font-weight:800;line-height:1.5;display:flex}.feedback>span{color:#fff;border-radius:50%;flex:0 0 26px;place-items:center;width:26px;height:26px;font-weight:950;display:grid}.feedback.good{color:#21733b;background:#e8f8ec}.feedback.good>span{background:#4f9a61}.feedback.try{color:#a0462f;background:#fff0e8}.feedback.try>span{background:#e06a43}.feedback.note{color:#5d5a29;background:#fff7d8}.feedback.note>span{background:#d3a91c}.check-button{color:#fff;background:var(--chapter);width:min(420px,100%);min-height:58px;box-shadow:0 12px 24px var(--chapter);border:0;border-radius:18px;margin:24px auto 0;display:block}@supports (color:color-mix(in lab, red, red)){.check-button{box-shadow:0 12px 24px color-mix(in srgb, var(--chapter) 28%, transparent)}}.check-button{cursor:pointer;font-size:16px;font-weight:950}.check-button:active{transform:translateY(1px)}.speak-card{background:#f7f9fb;border:1px solid #e0e8ef;border-radius:18px;align-items:center;gap:14px;margin-top:28px;padding:16px 18px;display:flex}.speak-card>span{background:#fff;border-radius:14px;flex:0 0 44px;place-items:center;width:44px;height:44px;font-size:21px;display:grid}.speak-card strong{font-size:12px;font-weight:900}.speak-card p{color:var(--muted);margin:3px 0 0;font-size:11px;font-weight:650;line-height:1.5}.guess-guard-layer{z-index:260;padding:max(18px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) max(18px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#0b2336ad;place-items:center;display:grid;position:fixed;inset:0;overflow-y:auto}.guess-guard-card{text-align:center;background:#fff;border-radius:30px;width:min(560px,100%);padding:clamp(24px,5vw,38px);box-shadow:0 36px 100px #05182761}.guard-icon{background:#fff3d6;border-radius:22px;place-items:center;width:68px;height:68px;margin:0 auto 14px;font-size:36px;display:grid}.guard-kicker{color:#a45a12;letter-spacing:.05em;font-size:11px;font-weight:950}.guess-guard-card h2{margin:8px 0 9px;font-size:clamp(25px,5vw,34px);font-weight:950;line-height:1.2}.guard-intro{max-width:450px;color:var(--muted);margin:0 auto;font-size:13px;font-weight:700;line-height:1.65}.guard-timer{color:#9e5919;background:#fffaf0;border:7px solid #ffe0a5;border-radius:50%;place-content:center;width:112px;height:112px;margin:22px auto;display:grid}.guard-timer.ready{color:#347d50;background:#f0faf3;border-color:#bde4c7}.guard-timer strong,.guard-timer span{display:block}.guard-timer strong{font-size:34px;font-weight:950;line-height:1}.guard-timer span{margin-top:6px;font-size:9px;font-weight:850}.guard-hint{text-align:left;background:#fff6df;border-radius:15px;padding:14px 16px}.guard-hint span,.guard-hint strong{display:block}.guard-hint span{color:#9c6a24;letter-spacing:.04em;font-size:9px;font-weight:900}.guard-hint strong{color:#654719;margin-top:5px;font-size:13px;font-weight:850;line-height:1.55}.guard-checks{text-align:left;gap:9px;margin-top:14px;display:grid}.guard-checks label{cursor:pointer;background:#f8fafb;border:1px solid #dce5ec;border-radius:15px;grid-template-columns:24px 1fr;align-items:center;gap:11px;min-height:62px;padding:11px 13px;display:grid}.guard-checks input{accent-color:#4f9a61;width:21px;height:21px}.guard-checks b,.guard-checks small{display:block}.guard-checks b{font-size:12px;font-weight:900}.guard-checks small{color:var(--muted);margin-top:3px;font-size:10px;font-weight:650;line-height:1.4}.guard-continue{color:#fff;cursor:pointer;background:#397f52;border:0;border-radius:16px;width:100%;min-height:54px;margin-top:17px;font-size:14px;font-weight:950}.guard-continue:disabled{color:#84939f;cursor:not-allowed;background:#e5eaee}.guard-hands-on{color:#647887;cursor:pointer;background:0 0;border:0;margin-top:11px;font-size:11px;font-weight:850}.modal-layer,.success-layer{z-index:200;padding:max(18px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) max(18px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#0a223794;place-items:center;display:grid;position:fixed;inset:0;overflow-y:auto}.modal-card,.success-card{z-index:2;background:#fff;border-radius:28px;width:min(520px,100%);padding:36px;position:relative;box-shadow:0 34px 90px #0618294d}.modal-close{width:38px;height:38px;color:var(--muted);cursor:pointer;background:#edf2f6;border:0;border-radius:12px;font-size:24px;line-height:1;position:absolute;top:18px;right:18px}.modal-icon{background:var(--blue-soft);border-radius:18px;place-items:center;width:58px;height:58px;font-size:29px;display:grid}.modal-card>span{color:var(--blue);letter-spacing:.1em;margin-top:20px;font-size:11px;font-weight:900;display:block}.modal-card h2{margin:6px 0 22px;font-size:27px;font-weight:950;line-height:1.25}.install-card ol{gap:10px;margin:0;padding:0;list-style:none;display:grid}.install-card li{min-height:58px;color:var(--muted);background:#f5f8fb;border-radius:15px;align-items:center;gap:12px;padding:10px 12px;font-size:13px;line-height:1.5;display:flex}.install-card li>strong{color:#fff;background:var(--blue);border-radius:11px;flex:0 0 34px;place-items:center;width:34px;height:34px;display:grid}.install-card li b{color:var(--ink)}.share-icon{width:23px;height:23px;color:var(--blue);background:#fff;border:1px solid #b8c7d5;border-radius:6px;place-items:center;font-weight:950;display:inline-grid}.install-card>p,.storage-note{color:var(--muted);margin:18px 0 0;font-size:11px;line-height:1.7}.primary-modal-button{color:#fff;background:var(--blue);cursor:pointer;border:0;border-radius:16px;width:100%;min-height:52px;margin-top:20px;font-weight:900}.parent-card ul{gap:9px;margin:0;padding:0;list-style:none;display:grid}.parent-card li{color:#315e55;background:#e8f7f3;border-radius:13px;padding:12px 14px;font-size:13px;font-weight:850}.parent-summary{grid-template-columns:repeat(2,1fr);gap:10px;margin-top:18px;display:grid}.parent-summary>div{text-align:center;background:#f2f5f8;border-radius:15px;padding:16px}.parent-summary strong,.parent-summary span{display:block}.parent-summary strong{font-size:22px;font-weight:950}.parent-summary span{color:var(--muted);margin-top:3px;font-size:10px;font-weight:750}.danger-button{color:#a23c45;cursor:pointer;background:#fff0f2;border:1px solid #f1c8cc;border-radius:14px;width:100%;min-height:48px;margin-top:16px;font-size:12px;font-weight:900}.success-layer{text-align:center}.success-card{width:min(440px,100%)}.success-emoji{font-size:58px;animation:.7s cubic-bezier(.2,.8,.2,1) both success-bounce}.success-card>p:first-of-type{color:var(--chapter);margin:12px 0 0;font-size:13px;font-weight:900}.success-card h2{margin:6px 0 18px;font-size:28px;font-weight:950}.success-card .star-row{justify-content:center}.success-card .star{font-size:42px;animation:.5s both star-pop}.success-card .star:nth-child(2){animation-delay:.1s}.success-card .star:nth-child(3){animation-delay:.2s}.success-note{color:var(--muted);margin:16px 0 22px;font-size:12px;font-weight:700;line-height:1.6}.success-card>button:not(.quiet-button){color:#fff;background:var(--chapter);cursor:pointer;border:0;border-radius:16px;width:100%;min-height:52px;font-weight:950}.quiet-button{color:var(--muted);cursor:pointer;background:0 0;border:0;margin-top:10px;font-size:11px;font-weight:750}.confetti{z-index:1;pointer-events:none;position:absolute;inset:0;overflow:hidden}.confetti i{left:calc((var(--i,1) * 5.5%) - 2%);background:#ffcf45;border-radius:3px;width:10px;height:18px;animation:2.3s ease-in infinite confetti-fall;position:absolute;top:-20px}.confetti i:nth-child(3n){background:#3bd1b7;transform:rotate(35deg)}.confetti i:nth-child(3n+1){background:#f05f69;transform:rotate(-25deg)}.confetti i:first-child{animation-delay:.1s;left:4%}.confetti i:nth-child(2){animation-delay:.7s;left:10%}.confetti i:nth-child(3){animation-delay:.3s;left:16%}.confetti i:nth-child(4){animation-delay:1s;left:22%}.confetti i:nth-child(5){animation-delay:.5s;left:28%}.confetti i:nth-child(6){animation-delay:1.3s;left:34%}.confetti i:nth-child(7){animation-delay:.2s;left:40%}.confetti i:nth-child(8){animation-delay:.9s;left:46%}.confetti i:nth-child(9){animation-delay:.4s;left:52%}.confetti i:nth-child(10){animation-delay:1.1s;left:58%}.confetti i:nth-child(11){animation-delay:.6s;left:64%}.confetti i:nth-child(12){animation-delay:1.4s;left:70%}.confetti i:nth-child(13){animation-delay:.3s;left:76%}.confetti i:nth-child(14){animation-delay:.8s;left:82%}.confetti i:nth-child(15){animation-delay:.1s;left:88%}.confetti i:nth-child(16){animation-delay:1.2s;left:94%}.confetti i:nth-child(17){animation-delay:1.6s;left:49%}.confetti i:nth-child(18){animation-delay:1.8s;left:19%}@keyframes success-bounce{0%{opacity:0;transform:scale(.4)rotate(-12deg)}65%{opacity:1;transform:scale(1.14)rotate(5deg)}to{transform:scale(1)rotate(0)}}@keyframes star-pop{0%{opacity:0;transform:scale(0)}70%{opacity:1;transform:scale(1.2)}to{transform:scale(1)}}@keyframes confetti-fall{0%{opacity:0;transform:translateY(-30px)rotate(0)}10%{opacity:1}to{opacity:.9;transform:translateY(105svh)rotate(540deg)}}@media (width<=900px){.hero{min-height:670px}.hero-content{grid-template-columns:1fr 210px;gap:35px;margin-top:70px}.progress-orbit{width:190px;height:190px}.progress-orbit strong{font-size:38px}.chapter-list,.drop-grid{grid-template-columns:1fr}.drop-zone{min-height:100px}}@media (width<=650px){.hero{min-height:730px;padding-left:18px;padding-right:18px}.hero-nav{align-items:flex-start}.brand .app-logo{flex-basis:48px;width:48px;height:48px}.brand strong{font-size:17px}.brand span{font-size:10px}.nav-actions{gap:6px;display:grid}.nav-actions button{border-radius:11px;min-height:36px;padding:0 11px;font-size:11px}.hero-content{grid-template-columns:1fr;gap:30px;margin-top:50px}.hero h1{font-size:42px}.hero-copy>p{font-size:15px}.progress-orbit{justify-self:end;width:152px;height:152px}.progress-orbit strong{font-size:31px}.hero-stats>div{min-width:0;padding:0 18px}.hero-stats strong{font-size:22px}.journey{width:min(100% - 24px,1180px);padding-top:25px}.section-heading{display:block}.section-heading>p{margin-top:14px}.chapter-card{border-radius:23px;padding:22px 18px 20px}.chapter-number{font-size:50px;right:20px}.chapter-intro{grid-template-columns:50px 1fr auto;gap:10px}.chapter-icon{width:50px;height:50px;font-size:23px}.chapter-intro h3{font-size:18px}.method-copy{display:block}.method-copy h2{text-align:left;margin-top:8px}.method-steps{grid-template-columns:repeat(2,1fr)}.level-topbar{grid-template-columns:46px 1fr auto;gap:9px}.learning-steps{gap:5px}.learning-steps>span{text-align:center;border-radius:13px;grid-template-rows:26px auto auto;grid-template-columns:1fr;justify-items:center;column-gap:0;min-height:62px;padding:8px 4px}.learning-steps b{border-radius:8px;grid-row:auto;width:26px;height:26px;font-size:10px}.learning-steps em{font-size:10px}.learning-steps small{display:none}.icon-button{width:42px;height:42px}.level-heading strong{font-size:14px}.top-stars{min-width:58px;padding:0 10px}.challenge-card{border-radius:24px;padding:23px 17px}.challenge-card h1{font-size:24px}.stage-emoji{border-radius:18px;width:60px;height:60px;margin-top:20px;font-size:32px}.concept-demo>header strong{font-size:11px}.demo-stage{height:210px}.measure-visual{padding-left:12px;padding-right:12px}.multiply-visual{grid-template-columns:120px 1fr;gap:10px;padding:12px}.vertical-math{width:120px;padding-left:17px;padding-right:17px}.multiply-steps span{padding:7px;font-size:9px}.code-parts{gap:6px}.code-parts>span{min-width:60px;padding:9px 7px}.angle-ray{width:105px}.fraction-strip{gap:3px;width:94%}.prompt-card,.materials-card{padding:16px}.stage-actions{grid-template-columns:1fr}.stage-actions .secondary-stage-button{order:2}.drop-grid{gap:9px}.drop-zone{min-height:92px}.modal-card,.success-card{border-radius:24px;padding:30px 20px 22px}.guess-guard-card{border-radius:24px;padding:25px 18px 20px}.guard-timer{width:96px;height:96px;margin:17px auto}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}}@media (display-mode:standalone){.nav-actions button:first-child{display:none}}