/*! 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{.visible{visibility:visible}.relative{position:relative}.start{inset-inline-start:var(--spacing)}.table{display:table}}:root{--navy:#0b376b;--blue:#106cc1;--ink:#17324d;--muted:#60758a;--green:#15935b;--orange:#f47b20;--purple:#6b3db5;--shadow:0 18px 50px #0e375e1a}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);font-family:var(--font-geist),Arial,sans-serif;background:#f7fbff;margin:0}button,input,textarea{font:inherit}button,a{outline-offset:3px}button{cursor:pointer}.topbar{z-index:50;color:#fff;background:linear-gradient(100deg,#0c376b,#0a619f);align-items:center;height:72px;padding:0 28px;display:flex;position:fixed;top:0;left:0;right:0;box-shadow:0 8px 25px #072d532e}.brand{color:#fff;background:0 0;border:0;align-items:center;gap:12px;font-size:18px;display:flex}.brand-mark{width:38px;height:38px;color:var(--blue);background:#fff;border-radius:11px;place-items:center;font-size:24px;display:grid}.progress-wrap{align-items:center;gap:10px;margin-left:auto;font-size:12px;display:flex}.progress{background:#ffffff40;border-radius:9px;width:150px;height:7px;overflow:hidden}.progress i{background:#62dd9b;border-radius:9px;height:100%;transition:all .3s;display:block}.mobile-menu{color:#fff;background:0 0;border:0;margin-right:12px;font-size:24px;display:none}.sidebar{z-index:40;color:#fff;background:#0b4f88;width:245px;padding:18px 12px;position:fixed;top:72px;bottom:0;left:0;overflow:auto}.sidebar nav{flex-direction:column;gap:4px;display:flex}.sidebar button{color:#eaf6ff;text-align:left;background:0 0;border:0;border-radius:10px;padding:11px 12px;font-size:13px;line-height:1.3}.sidebar button:hover,.sidebar button:focus{background:#ffffff21}.sidebar button span{width:26px;font-size:17px;display:inline-block}.sidebar .sub{color:#c9e7fb;padding:7px 10px 7px 38px;font-size:12px}.nav-label{text-transform:uppercase;letter-spacing:.14em;color:#86c5ed;margin:15px 12px 4px;font-size:10px}main{margin-left:245px;padding-top:72px}.section-pad{padding:82px clamp(28px,6vw,90px)}.hero{background:radial-gradient(circle at 70% 30%,#dff1ff 0,#f8fcff 43%,#fff 70%);grid-template-columns:1.1fr .9fr;align-items:center;gap:50px;min-height:650px;display:grid;overflow:hidden}.eyebrow,.step{color:#c95d0d;letter-spacing:.09em;text-transform:uppercase;background:#fff0df;border-radius:30px;padding:8px 13px;font-size:12px;font-weight:800;display:inline-flex}.hero h1{letter-spacing:-.055em;color:var(--navy);margin:20px 0;font-size:clamp(42px,5vw,72px);line-height:1.02}.hero h1 em{color:#f2741c;font-style:normal}.hero-copy>p{color:#4f6780;max-width:650px;font-size:18px;line-height:1.75}.hero-actions{gap:12px;margin:28px 0;display:flex}.primary,.secondary,.link-button{border:1px solid #0000;border-radius:12px;align-items:center;gap:20px;padding:14px 20px;font-weight:800;text-decoration:none;display:inline-flex}.primary{color:#fff;background:linear-gradient(135deg,#0f70c9,#094e92);box-shadow:0 10px 24px #0f70c938}.primary:disabled{opacity:.45;cursor:not-allowed}.secondary{color:#164f80;background:#fff;border-color:#c8dbe9}.mini-proof{color:#567087;flex-wrap:wrap;gap:18px;font-size:12px;display:flex}.hero-visual{height:450px;position:relative}.receipt{width:180px;height:220px;box-shadow:var(--shadow);text-align:center;background:#fff;border-top:12px solid #d9e4ed;border-radius:8px;padding:34px 18px;position:absolute;top:40px;right:22px;transform:rotate(5deg)}.receipt small{color:#546779;font-weight:900}.receipt b{color:#1d4366;margin:28px 0 8px;font-size:25px;display:block}.receipt i{color:var(--green);font-size:12px}.discount-tag{z-index:2;color:#66340b;background:#ffc33e;border:4px solid #c96e1d;border-radius:12px;padding:16px 24px;font-weight:900;position:absolute;top:30px;left:35px;transform:rotate(-7deg);box-shadow:0 9px #b8621b}.discount-tag strong{font-size:38px;display:block}.calculator{z-index:3;width:205px;box-shadow:var(--shadow);background:#19496f;border:10px solid #0b3555;border-radius:18px;grid-template-columns:repeat(4,1fr);gap:8px;padding:13px;display:grid;position:absolute;bottom:38px;right:70px;transform:rotate(3deg)}.calculator div{text-align:right;background:#cde8e8;border-radius:5px;grid-column:1/-1;padding:11px;font-weight:800}.calculator span{color:#0a3454;text-align:center;background:#9fc2d8;border-radius:4px;padding:8px;font-weight:800}.coins{color:#f3af20;filter:drop-shadow(0 8px 3px #b86f13);font-size:75px;position:absolute;bottom:75px;left:85px;transform:rotate(-10deg)}.coins i,.coins b{position:absolute;bottom:-20px;left:40px}.coins b{bottom:-5px;left:82px}.intro-grid{background:#fff;grid-template-columns:1fr 1fr;gap:22px;padding-top:45px;padding-bottom:45px;display:grid}.info-card{border:1px solid;border-radius:20px;gap:20px;padding:28px;display:flex}.info-card.blue{background:#edf7ff;border-color:#badef7}.info-card.green{background:#edfff5;border-color:#b5e8ca}.card-icon{width:42px;height:42px;color:var(--blue);background:#fff;border-radius:12px;flex:none;place-items:center;font-weight:900;display:grid;box-shadow:0 5px 15px #00000012}.info-card h2{margin:0 0 8px;font-size:19px}.info-card p{color:#567087;margin:0;font-size:14px;line-height:1.65}.warm-section{background:#fff9ef}.section-heading{max-width:720px;margin-bottom:34px}.section-heading.center{text-align:center;margin-left:auto;margin-right:auto}.section-heading h2{letter-spacing:-.035em;color:#123f6d;margin:14px 0 10px;font-size:clamp(30px,3.6vw,46px)}.section-heading p{color:#61788c;line-height:1.7}.scenario-grid{grid-template-columns:repeat(3,1fr);gap:18px;display:grid}.scenario-grid article{background:#fff;border:1px solid #eedfc8;border-radius:20px;padding:26px;box-shadow:0 10px 30px #6d47180f}.scenario-icon{color:#fff;border-radius:14px;place-items:center;width:48px;height:48px;font-size:22px;font-weight:900;display:grid}.scenario-icon.orange{background:#f38b24}.scenario-icon.green{background:#2ba76a}.scenario-icon.purple{background:#7950bd}.scenario-grid h3{margin:18px 0 9px}.scenario-grid p{color:#687b8c;font-size:14px;line-height:1.65}.learning-section{background:#fff}.blue-step{color:#0f6bbb;background:#e5f2ff}.lesson-tabs{grid-template-columns:repeat(7,1fr);gap:7px;margin-bottom:15px;display:grid}.lesson-tabs button{color:#718496;background:#f8fbfd;border:1px solid #d9e5ed;border-radius:12px;padding:12px 6px;font-weight:800}.lesson-tabs button.active{color:#fff;background:#0d5f9f;border-color:#0d5f9f;box-shadow:0 7px 16px #0d5f9f2e}.lesson-panel{background:#f8fcff;border:1px solid #cde0ee;border-radius:24px;grid-template-columns:1.3fr .7fr;display:grid;overflow:hidden}.lesson-main{gap:22px;padding:38px;display:flex}.lesson-number{color:#fff;background:#0d65aa;border-radius:20px;flex:none;place-items:center;width:70px;height:70px;font-size:33px;font-weight:900;display:grid}.lesson-main small,.worked-example small{letter-spacing:.12em;color:#66829a;font-weight:900}.lesson-main h3{color:#123e68;margin:7px 0 13px;font-size:28px}.lesson-main p{color:#5c7488;line-height:1.72}.formula{color:#164a78;background:#fff;border-left:4px solid #1470b5;border-radius:8px;margin-top:20px;padding:15px 18px;font-weight:900;box-shadow:0 8px 20px #164a780f}.worked-example{color:#fff;background:#0d416f;padding:38px}.worked-example small{color:#8ecbf3}.worked-example p{line-height:1.65}.worked-example button{color:#fff;background:#ffffff1a;border:1px solid #ffffff73;border-radius:10px;padding:10px 14px;font-weight:800}.answer{color:#126b3f;background:#dff9ea;border-radius:10px;margin-top:15px;padding:13px;font-size:14px}.interactive-section{background:#f1f9f5}.green-step{color:#158553;background:#dff8e9}.lab-grid{grid-template-columns:.8fr 1.2fr;gap:22px;display:grid}.control-card,.graph-card{box-shadow:var(--shadow);background:#fff;border:1px solid #cfe5d8;border-radius:22px;padding:28px}.control-card label{color:#61788c;justify-content:space-between;margin:7px 0;font-size:13px;font-weight:700;display:flex}.control-card output{color:#123f68;font-size:16px;font-weight:900}.control-card input[type=range]{accent-color:#14915a;width:100%;margin:8px 0 24px}.result-row{grid-template-columns:1fr 1fr;gap:10px;display:grid}.result-row div{background:#f2f6f8;border-radius:12px;padding:15px}.result-row .highlight{background:#e0f7e9}.result-row span{color:#657c8f;font-size:11px;display:block}.result-row b{color:#16476d;margin-top:5px;display:block}.tool-link{color:#13764b;background:#eff8f2;border-radius:10px;justify-content:space-between;margin-top:20px;padding:12px 15px;font-size:13px;font-weight:800;text-decoration:none;display:flex}.graph-title{justify-content:space-between;align-items:center;display:flex}.graph-title small{color:#15915a;letter-spacing:.1em;font-weight:900;display:block}.graph-title b{margin-top:5px;display:block}.geogebra-badge{color:#168658;background:#ebf7f0;border-radius:10px;padding:8px 10px;font-size:11px;font-weight:900}.graph-card svg{width:100%;margin-top:14px;overflow:visible}.graph-card svg line{stroke:#8299a9;stroke-width:1.5px}.graph-card svg .grid-line{stroke:#e0e9ee;stroke-width:1px}.graph-card svg polyline{fill:none;stroke:#1777ba;stroke-width:4px}.graph-card svg circle{fill:#f47d25;stroke:#fff;stroke-width:3px}.graph-card svg text{fill:#718596;font-size:11px}.graph-card svg .point-label{fill:#0d5e9d;font-weight:800}.graph-card p{color:#60778a;text-align:center;margin:0;font-size:13px}.sheet-section{background:#fff}.cyan-step{color:#0a7c80;background:#e1f7f7}.sheet-window{box-shadow:var(--shadow);border:1px solid #c9dbe7;border-radius:18px;overflow:hidden}.sheet-bar{background:#f3f7f9;border-bottom:1px solid #cfdee7;align-items:center;gap:12px;padding:14px 18px;display:flex}.sheet-bar span:last-child{color:#7b8d9d;margin-left:auto;font-size:11px}.sheet-logo{color:#fff;background:#20a464;border-radius:8px;padding:8px}.table-scroll{overflow:auto}.sheet-window table{border-collapse:collapse;width:100%;min-width:750px}.sheet-window th{color:#24516f;text-align:left;background:#e8f4fb;border:1px solid #c9dbe7;padding:13px;font-size:12px}.sheet-window td{border:1px solid #dce7ed;padding:9px;font-size:12px}.sheet-window td:first-child{text-align:center;background:#f6f8f9}.sheet-window input{color:#24455d;background:#fff8d9;border:1px solid #0000;border-radius:5px;width:100%;padding:8px}.total-cell{color:#126b42;font-weight:800;background:#e1f6e9!important}.sheet-footer{background:#f4f7f9;justify-content:space-between;padding:12px 18px;display:flex}.sheet-footer button,.sheet-footer a{color:#277254;background:#fff;border:0;border-radius:8px;padding:8px 12px;font-size:12px;font-weight:800;text-decoration:none}.quiz-section{background:#f7f2ff}.purple-step{color:#6733af;background:#eee4ff}.quiz-head{justify-content:space-between;align-items:end;margin-bottom:28px;display:flex}.quiz-head h2{color:#3b2463;margin:13px 0 8px;font-size:42px}.quiz-head p{color:#6f6380}.quiz-score{background:#fff;border:8px solid #d9c4fa;border-radius:50%;align-content:center;place-items:center;width:115px;height:115px;display:grid}.quiz-score span{color:#756785;font-size:11px}.quiz-score b{color:#6335a5;font-size:31px}.questions{gap:13px;display:grid}.questions article{background:#fff;border:1px solid #ded3ee;border-radius:18px;gap:18px;padding:23px;display:flex}.questions article.correct{background:#f1fff6;border-color:#53bd7e}.questions article.wrong{background:#fff7f7;border-color:#e88a91}.q-number{color:#fff;background:#6e3caf;border-radius:11px;flex:none;place-items:center;width:38px;height:38px;font-weight:900;display:grid}.q-body{width:100%}.q-body h3{margin:5px 0 17px;font-size:16px}.options{grid-template-columns:1fr 1fr;gap:9px;display:grid}.options label{color:#5d516d;cursor:pointer;border:1px solid #e2d9ee;border-radius:10px;align-items:center;gap:9px;padding:10px;font-size:13px;display:flex}.options input{display:none}.options label:has(input:checked){color:#4e287f;background:#ede2ff;border-color:#7b48bd}.options label span{background:#f0ebf5;border-radius:7px;place-items:center;width:24px;height:24px;font-weight:900;display:grid}.feedback{margin-bottom:0;font-size:13px;font-weight:800}.quiz-actions{align-items:center;gap:12px;margin-top:24px;display:flex}.text-button{color:#65409b;background:0 0;border:0;font-weight:800}.score-message{border-radius:14px;justify-content:space-between;margin-top:18px;padding:18px;display:flex}.score-message.pass{color:#116f42;background:#ddf8e8}.score-message.retry{color:#995d07;background:#fff1da}.reflection-section{background:linear-gradient(120deg,#fffaf0,#eef8ff);grid-template-columns:1fr 1fr;align-items:center;gap:45px;display:grid}.yellow-step{color:#a56b00;background:#fff0bd}.reflection-copy h2{color:#16456f;margin:14px 0;font-size:40px}.reflection-copy p{color:#61778a;line-height:1.7}.quote{color:#7a632c;border-left:4px solid #f0ac26;margin-top:24px;padding:12px 17px;font-style:italic}.reflection-box{box-shadow:var(--shadow);background:#fff;border:1px solid #d7e4ed;border-radius:20px;padding:24px}.reflection-box label{color:#234e71;font-weight:900}.reflection-box textarea{resize:vertical;border:1px solid #cfdee9;border-radius:12px;width:100%;min-height:160px;margin:12px 0;padding:15px;display:block}.reflection-box div{color:#7b8c9b;justify-content:space-between;align-items:center;font-size:11px;display:flex}.reflection-box button{color:#fff;background:#0e6eaf;border:0;border-radius:9px;padding:10px 15px;font-weight:800}footer{color:#fff;background:#082e57;justify-content:space-between;align-items:center;padding:32px clamp(28px,6vw,90px);display:flex}footer b,footer span{display:block}footer span,footer p{color:#a6cae7;font-size:12px}@media (width<=1050px){.sidebar{width:210px}main{margin-left:210px}.section-pad{padding:65px 38px}.hero{grid-template-columns:1fr}.hero-visual{display:none}.lesson-panel,.lab-grid{grid-template-columns:1fr}.lesson-tabs{grid-template-columns:repeat(4,1fr)}}@media (width<=760px){.topbar{height:62px;padding:0 14px}.brand{font-size:14px}.brand-mark{width:34px;height:34px}.mobile-menu{display:block}.progress-wrap span,.progress-wrap .progress{display:none}.sidebar{width:250px;transition:all .25s;top:62px;left:-260px;box-shadow:15px 0 30px #0003}.sidebar.open{left:0}main{margin-left:0;padding-top:62px}.section-pad{padding:54px 20px}.hero{min-height:610px}.hero h1{font-size:45px}.hero-copy>p{font-size:16px}.hero-actions{flex-direction:column;align-items:stretch}.hero-actions button{justify-content:center}.mini-proof{flex-direction:column;gap:7px}.intro-grid,.scenario-grid,.reflection-section{grid-template-columns:1fr}.lesson-tabs{grid-template-columns:repeat(3,1fr)}.lesson-main{flex-direction:column;padding:25px}.worked-example{padding:25px}.lab-grid{grid-template-columns:1fr}.graph-card{padding:18px}.quiz-head{align-items:center}.quiz-head h2{font-size:32px}.quiz-score{width:85px;height:85px}.options{grid-template-columns:1fr}.questions article{gap:12px;padding:16px}.quiz-actions{flex-direction:column;align-items:stretch}.quiz-actions>*{text-align:center;justify-content:center}.score-message{flex-direction:column;gap:5px}.sheet-bar span:last-child{display:none}footer{flex-direction:column;align-items:flex-start;gap:10px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}