:root{--paper:#f7f7f5;--ink:#20373a;--petrol:#24666a;--sage:#dcefe1;--soft:#edf2eb;--gold:#eee3bf;--muted:#61716e;--line:#d8e1d8;--white:#fff;--red:#943d38;--radius:22px;--shadow:0 12px 34px #213e3608}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:108px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 Arial,Helvetica,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}img{display:block;max-width:100%;height:auto}h1,h2,h3,h4{letter-spacing:-.045em;line-height:1.12;margin:0 0 18px}h1{font-size:clamp(38px,4.8vw,66px)}h2{font-size:clamp(27px,3vw,38px)}h3{font-size:23px}p{margin:0 0 17px}ul,ol{padding-left:23px}li+li{margin-top:6px}.wrap{width:min(1160px,calc(100% - 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a{text-decoration:underline}.explain-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0}.explain-grid article{background:var(--soft);border-radius:12px;padding:19px}.explain-grid h3{font-size:17px;margin:0 0 10px}.explain-grid p{font-size:13px;margin:0}.agent-route{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:0;margin:22px 0}.agent-route li{border:1px solid #c8d5ca;border-radius:9px;background:#fff;padding:12px 8px;margin:0;text-align:center;font-size:12px;line-height:1.5}.agent-route li b{display:block;font-size:20px;margin-bottom:4px}.agent-route li[aria-current=step]{background:var(--petrol);color:white;border-color:var(--petrol)}.agent-route li[data-done=true]{background:var(--sage)}.event-data{font-size:13px;background:white;border-radius:9px;border:1px solid var(--line);padding:15px;margin:15px 0}.agent-log{list-style:none;padding:0;margin:16px 0}.agent-log li{font-size:13px;padding:10px 0;border-bottom:1px solid 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@media(min-width:1001px){.module-card h3{min-height:54px}.module-card .description{min-height:46px}}
@media(max-width:1000px){.hero{gap:30px;padding-top:42px}.hero h1{font-size:48px}.module-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.top-nav{gap:17px}.learning-layout{grid-template-columns:220px minmax(0,1fr);gap:20px}.lesson-sidebar{padding:18px}.lesson-panel{padding:27px}.sampling-controls{grid-template-columns:1fr}.experiment-teaser{gap:25px;padding:28px}.context-cards{grid-template-columns:1fr}.planned-layout{gap:24px}}
@media(max-width:700px){.wrap{width:calc(100% - 36px)}.header-inner{min-height:75px;gap:15px;flex-wrap:wrap;padding-block:14px}.brand strong{font-size:21px}.brand img{width:36px;height:36px}.top-nav{gap:17px;font-size:12px}.top-nav .home-link{display:none}.hero{grid-template-columns:1fr;gap:28px;padding:36px 0 28px}.hero h1{font-size:48px;max-width:520px}.hero .intro{font-size:16px}.hero figure{max-width:600px}.hero figcaption{font-size:11px}.facts{gap:22px;justify-content:space-between;font-size:11px}.facts strong{font-size:15px}.section{padding:34px 0}.section-heading{align-items:start;flex-direction:column;gap:13px}.experiment-teaser{grid-template-columns:1fr;gap:25px;padding:25px}.experiment-teaser h2{font-size:29px}.mini-context span{padding:14px}.catalog-tools{gap:13px}.search{margin-left:0;width:100%}.search input{width:100%}.module-grid{gap:14px}.module-card .copy{padding:19px}.module-card h3{font-size:22px}.module-card .description{font-size:13px}.module-top{flex-wrap:wrap;gap:6px}.module-card .tag{font-size:10px}.learning-layout{grid-template-columns:1fr}.lesson-sidebar{position:static;padding:18px}.lesson-nav{display:flex;overflow-x:auto;gap:8px;margin:15px 0 0;padding-bottom:8px}.lesson-nav li{flex:0 0 170px;margin:0}.lesson-nav li+li{margin:0}.lesson-nav a{height:100%;padding:10px}.lesson-sidebar .fine{margin-top:8px;margin-bottom:0}.lesson-panel{padding:25px}.lesson-panel h2{font-size:28px}.context-cards{grid-template-columns:1fr 1fr}.lesson-intro{font-size:16px!important}.page-head h1{font-size:36px}.explain-grid{gap:10px}.planned-layout{grid-template-columns:1fr}.dashboard-grid{grid-template-columns:1fr}.footer{flex-direction:column;gap:12px}.experiment-page>.lab{padding:24px}.page-head{padding-bottom:19px}.two-fields{grid-template-columns:1fr}.path-list .path-time{display:none}}
@media(max-width:420px){.header-inner{gap:10px}.top-nav{gap:15px;font-size:11px}.brand strong{font-size:20px}.brand small{font-size:8px}.brand img{width:32px;height:32px}.brand{gap:8px}.hero h1{font-size:42px}.module-grid{grid-template-columns:1fr}.module-card img{aspect-ratio:2/1}.module-card .copy{padding:22px}.facts{gap:10px}.facts strong{font-size:13px}.facts span{font-size:10px}.context-cards{grid-template-columns:1fr}.context-choice{padding:12px}.lab{padding:18px}.lesson-panel{padding:20px}.explain-grid{grid-template-columns:1fr}.agent-route{gap:5px}.agent-route li{font-size:10px;padding:9px 4px}.agent-route li b{font-size:16px}.prob-row{grid-template-columns:38px 1fr 47px;gap:8px;font-size:12px}.lesson-controls .button{font-size:12px}.experiment-page>.lab{padding:20px}.budget-track span{font-size:9px}.mini-context span{font-size:12px}.path-list li{padding:17px}.page-head h1{font-size:33px}.note-strip{padding:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}
@media print{.masthead,.lesson-sidebar,.lesson-controls,.footer,.actions{display:none}.lesson[hidden]{display:block!important}.learning-layout{display:block}.lesson-panel{border:0;padding:0}.lesson{break-before:page}.wrap{width:100%}body{background:#fff}.lab{break-inside:avoid}.hero{padding:20px 0}.hero h1{font-size:38px}}

.hero .fine{margin-top:14px}.lesson-sidebar,.lesson-panel{min-width:0}

.invitation-banner{margin-top:22px;padding:16px 20px;background:var(--sage);border:1px solid #b9d3bf;border-radius:12px;display:flex;gap:8px 22px;align-items:center;flex-wrap:wrap;font-size:13px}.invitation-banner strong{font-size:14px}.invitation-banner span{color:var(--muted)}.invitation-banner a{color:var(--petrol);font-weight:700;margin-left:auto}
/* Modular learning catalog */
.workshop-hero{display:grid;grid-template-columns:1.05fr 1fr;gap:3rem;align-items:center;padding:3.6rem 0 2rem}.workshop-hero h1{font-size:clamp(2.5rem,4.8vw,4.3rem);line-height:1.05;letter-spacing:-.045em;margin:.7rem 0 1.3rem}.hero-tutors{position:relative;border-radius:22px;overflow:hidden;background:#e5eee8}.hero-tutors img{width:100%;display:block;object-fit:cover;height:auto}.hero-tutors>span{display:block;padding:1rem 1.3rem;font-size:.88rem;line-height:1.6}.level-jumps{display:grid;grid-template-columns:repeat(4,1fr);gap:.7rem;margin:1rem 0 2rem}.level-jumps a{border:1px solid var(--line);border-radius:14px;padding:1rem;text-decoration:none;display:flex;flex-direction:column;gap:.4rem;background:#fff}.level-jumps span{font-size:.85rem;color:var(--muted)}.bundle-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.4rem}.bundle-card{border:1px solid var(--line);border-radius:19px;background:#fff;overflow:hidden;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}.bundle-card:hover{transform:translateY(-3px);box-shadow:0 10px 25px #1c444410}.bundle-card .copy{padding:1.3rem;display:flex;flex:1;flex-direction:column}.bundle-card h3{font-size:1.4rem;line-height:1.2;margin:.2rem 0 .5rem;letter-spacing:-.02em}.bundle-card p:not(.eyebrow){font-size:.94rem;color:var(--muted);line-height:1.6}.bundle-meta{font-size:.8rem;color:var(--petrol);margin:auto 0 1rem}.bundle-thumb{aspect-ratio:16/9;position:relative;background:#183537;overflow:hidden}.bundle-thumb img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;opacity:.82}.bundle-thumb:after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#102b2cf0,#12343780 60%,#12343700)}.bundle-thumb>div{position:relative;z-index:1;height:100%;width:78%;display:flex;flex-direction:column;justify-content:center;gap:.8rem;padding:1.1rem;color:#fff}.bundle-thumb small{font-size:.55rem;letter-spacing:.13em;color:#e6edd9;font-weight:700}.bundle-thumb strong{font-size:clamp(1.15rem,2.1vw,1.7rem);line-height:1.05;font-weight:850;letter-spacing:-.02em}.thumbnail-level{position:absolute;z-index:2;right:.65rem;bottom:.65rem;font-size:.55rem;font-weight:800;border-radius:4px;padding:.35rem .5rem;background:#e7b44f;color:#1e3636}.bite-card{border:1px solid var(--line);border-radius:16px;background:#fff;padding:1.25rem;display:flex;flex-direction:column;min-width:0}.bite-card.locked{background:#f0f1ef}.bite-card.locked h3{color:#596969}.bite-card.open{border-top:4px solid var(--petrol)}.bite-card h3{font-size:1.3rem;line-height:1.25;margin:1rem 0 .6rem}.bite-card p{color:var(--muted);font-size:.95rem;line-height:1.6}.bite-card .text-link{margin-top:auto}.bite-top{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;justify-content:space-between}.unit-code,.unit-progress{font-size:.77rem;font-weight:700;color:var(--petrol)}.unit-progress{margin-top:.8rem}.level-section{scroll-margin-top:120px}.preview-panel,.login-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:2rem}.preview-panel{max-width:880px;margin:2rem 0}.preview-panel h2{font-size:1.9rem}.login-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:3rem;max-width:940px}.login-card .field input{padding:1rem;border-radius:10px;border:1px solid #a7bbb6;background:#fff;min-width:0;width:100%;font:inherit}.bundle-detail{display:grid;grid-template-columns:1fr 1.1fr;align-items:center;gap:2rem;margin-top:2rem}.bundle-detail .bundle-thumb{border-radius:18px}.bundle-detail .bundle-thumb strong{font-size:clamp(1.5rem,3vw,2.7rem)}.starter-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:2rem;align-items:start}.starter-video{margin:0}.starter-video video{width:100%;aspect-ratio:16/9;border-radius:18px;background:#143b3e;display:block}.starter-video figcaption{font-size:.8rem;color:var(--muted);line-height:1.6;margin:.7rem 0}.history-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.history-grid article{padding:1.4rem;border:1px solid var(--line);background:#fff;border-radius:16px}.history-grid b{font-size:2rem;color:var(--petrol)}.history-grid h3{font-size:1.3rem}.history-grid a{font-size:.85rem}.micro-lesson{max-width:920px;margin:2rem auto}.micro-lesson>.lab{margin:1.5rem 0}.nav-button{border:0;background:transparent;font:inherit;color:var(--petrol);cursor:pointer;padding:.4rem 0}.top-nav form{margin:0}.access-link{font-weight:700}.level-section .module-grid{grid-template-columns:repeat(3,minmax(0,1fr))}main{min-height:65vh}.source-details{margin:1rem 0}.source-details ul{line-height:1.8}.feedback{overflow-wrap:anywhere}
@media(max-width:1000px){.bundle-grid,.level-section .module-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.level-jumps{grid-template-columns:repeat(2,minmax(0,1fr))}.workshop-hero{gap:1.5rem}.bundle-thumb strong{font-size:1.5rem}}
@media(max-width:700px){.workshop-hero,.bundle-detail,.starter-grid,.login-layout{grid-template-columns:1fr;gap:1.5rem}.workshop-hero{padding-top:1.7rem}.workshop-hero h1{font-size:2.8rem}.bundle-grid,.level-section .module-grid,.history-grid{grid-template-columns:1fr}.bundle-thumb strong{font-size:1.9rem}.bundle-card .copy{padding:1.2rem}.level-jumps a{padding:.8rem}.level-jumps b{font-size:.9rem}.level-jumps span{font-size:.78rem}.preview-panel,.login-card{padding:1.2rem}.header-inner{align-items:flex-start;flex-direction:column}.top-nav{flex-wrap:wrap;gap:.65rem 1rem}.top-nav a,.top-nav button{font-size:.85rem}.page-head h1{overflow-wrap:break-word}.micro-lesson{padding:1.1rem}.bundle-detail .page-head{padding:0}}
@media(prefers-reduced-motion:reduce){.bundle-card{transition:none}.bundle-card:hover{transform:none}}
/* Topic-specific thumbnail compositions, with the approved comic tutor duo. */
.course-cover{position:relative;aspect-ratio:16/9;overflow:hidden;isolation:isolate;background:#1d4144}.cover-theme{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.32;z-index:-2}.course-cover:after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#163537f5 0%,#183c3fbc 43%,#15363810 83%);z-index:-1}.cover-tutors{position:absolute;width:68%;max-width:none;height:auto;right:-8%;bottom:-4%;filter:drop-shadow(0 2px 3px #10282850)}.cover-words{position:absolute;left:5.5%;top:13%;bottom:18%;width:56%;display:flex;flex-direction:column;justify-content:center;gap:.8rem;color:#fff;z-index:2}.cover-words small{font-size:.47rem;letter-spacing:.1em;font-weight:800;color:#dbe8dd;white-space:nowrap}.cover-words strong{font-size:clamp(1.15rem,1.7vw,1.55rem);line-height:1.06;font-weight:850;letter-spacing:-.025em;max-width:95%;text-wrap:balance;text-shadow:0 2px 8px #13363860}.cover-label{position:absolute;z-index:3;bottom:7%;left:5.5%;border-radius:5px;background:#efd281;color:#18383a;padding:.3rem .55rem;font-size:.57rem;font-weight:800;letter-spacing:.04em}.bite-card{padding:0;overflow:hidden;border-top-width:1px}.bite-copy{padding:1.2rem;display:flex;flex:1;flex-direction:column}.bite-card.open{border-top-width:1px;border-color:#b4d2bd}.bite-card.open .bite-copy{box-shadow:inset 0 3px 0 #24666a}.bite-card.locked .course-cover{filter:saturate(.55)}.bite-card.locked .cover-tutors{opacity:.88}.bite-card.locked .bite-copy{background:#f0f1ef}.bite-card>.unit-progress{margin:.1rem 1.2rem 1rem}.module-detail-cover{max-width:620px;margin:2rem 0 0}.module-detail-cover .course-cover,.bundle-detail .course-cover{border-radius:18px}.module-detail-cover .cover-words strong,.bundle-detail .cover-words strong{font-size:clamp(1.5rem,2.4vw,2.2rem)}.module-detail-cover .cover-words small,.bundle-detail .cover-words small{font-size:.7rem}.module-detail-cover .cover-label,.bundle-detail .cover-label{font-size:.7rem}.starter-video figcaption{padding:0}.unit-cover .cover-words strong{font-size:clamp(1.1rem,1.65vw,1.45rem)}
@media(max-width:1000px){.cover-words strong,.unit-cover .cover-words strong{font-size:1.5rem}.cover-words small{font-size:.56rem}}
@media(max-width:700px){.cover-words strong,.unit-cover .cover-words strong{font-size:clamp(1.15rem,5.5vw,2rem)}.cover-words small{font-size:clamp(.4rem,1.8vw,.65rem)}.cover-label{font-size:.6rem}.cover-words{gap:.6rem}.module-detail-cover .cover-words strong,.bundle-detail .cover-words strong{font-size:clamp(1.4rem,5.7vw,2rem)}.module-detail-cover .cover-words small,.bundle-detail .cover-words small{font-size:.55rem}.module-detail-cover .cover-label,.bundle-detail .cover-label{font-size:.6rem}}
@media(max-width:700px){.top-nav .home-link{display:inline}.top-nav a,.top-nav button{padding-block:.5rem}.header-inner{gap:.3rem}.masthead .brand{padding-top:.2rem}}
/* An isometric office mission. Movement follows decisions, never auto-plays. */
.office-scene{position:relative;max-width:620px;height:300px;margin:1.2rem auto;overflow:hidden;background:radial-gradient(ellipse at center,#eef4e9,#f7f7f5 70%);border-radius:18px}.office-floor{position:absolute;width:360px;height:300px;left:50%;top:48%;transform:translate(-50%,-50%) rotateX(58deg) rotateZ(-35deg);background:repeating-linear-gradient(0deg,transparent 0 49px,#b3c6ba66 50px),repeating-linear-gradient(90deg,#e0e9dd 0 49px,#b3c6ba66 50px);border:10px solid #ceddcf;box-shadow:8px 15px 0 #a8bfb4}.office-stations{position:absolute;inset:0;list-style:none;margin:0;padding:0}.office-stations li{position:absolute;display:flex;flex-direction:column;align-items:center;justify-content:center;width:100px;height:52px;padding:5px;font-size:.72rem;font-weight:700;border-radius:8px;background:#fff6dc;border:1px solid #d4bc7d;box-shadow:8px 10px 0 #c5b18a;line-height:1.3}.office-stations b{font-size:1rem}.office-stations li:nth-child(1){left:9%;top:43%}.office-stations li:nth-child(2){left:34%;top:16%}.office-stations li:nth-child(3){left:63%;top:32%}.office-stations li:nth-child(4){left:42%;top:68%}.office-stations li[aria-current]{outline:3px solid #24666a;outline-offset:4px}.office-stations li[data-done=true]{background:#dcefe1;border-color:#92b49a}.office-worker{position:absolute;left:22%;top:66%;width:24px;height:43px;transition:left .65s ease,top .65s ease;z-index:3;filter:drop-shadow(4px 5px 2px #24463e44)}.office-worker i{display:block;background:#eed09a;border:2px solid #25484a;width:19px;height:19px;border-radius:50%;margin:auto;position:relative;z-index:2}.office-worker span{display:block;width:24px;height:24px;background:#24666a;border-radius:8px 8px 4px 4px;border:2px solid #204449;margin-top:-2px}.office-game[data-stage='1'] .office-worker{left:49%;top:36%}.office-game[data-stage='2'] .office-worker{left:79%;top:55%}.office-game[data-stage='3'] .office-worker,.office-game[data-stage='4'] .office-worker{left:62%;top:81%}.office-choice{display:block;width:100%;text-align:left;padding:.85rem 1rem;border:1px solid #bfcec3;border-radius:10px;background:#fff;color:var(--ink);margin:.65rem 0;font-size:.95rem}.office-choice:hover{background:#e5eee7}.office-meter{font-weight:700;color:var(--petrol)}.office-question h4{font-size:1.15rem}.dialog-impulse{margin:1.7rem 0;background:#e6eee6;border:1px solid #cad9cd;border-radius:16px;padding:1.2rem 1.5rem}.dialog-impulse .eyebrow{margin-bottom:.5rem}.dialog-impulse summary{cursor:pointer;font-weight:700}.dialog-impulse p{font-size:.96rem}.dialog-impulse details p{margin-top:1rem}.dialog-role{display:inline-block;font-weight:800;color:var(--petrol);margin-right:.3rem}
@media(max-width:700px){.office-scene{height:265px;margin-inline:-.4rem}.office-stations li{width:75px;font-size:.64rem}.office-floor{width:270px;height:240px}.office-stations li:nth-child(1){left:3%}.office-stations li:nth-child(2){left:34%;top:12%}.office-stations li:nth-child(3){left:66%}.office-stations li:nth-child(4){left:37%}.office-game[data-stage='2'] .office-worker{left:80%}.dialog-impulse{padding:1rem}}
@media(prefers-reduced-motion:reduce){.office-worker{transition:none}}
.bite-card .format-list{font-size:.76rem;line-height:1.55;color:var(--petrol);margin-bottom:1.2rem}.office-game button:focus-visible,.course-cover~.copy a:focus-visible{outline:3px solid #c29636;outline-offset:3px}
.office-monitor{position:absolute;left:50%;top:-27px;width:36px;height:25px;transform:translateX(-50%) skewY(-7deg);border:4px solid #294a4c;background:linear-gradient(135deg,#aed0cf,#dcefe1);border-radius:4px;box-shadow:4px 3px 0 #789b92}.office-monitor:after{content:'';position:absolute;width:15px;height:8px;background:#36575a;top:20px;left:7px;transform:skewY(7deg)}.office-plant{position:absolute;left:29%;top:75%;width:22px;height:27px;border-radius:2px 2px 7px 7px;background:#d5af7c;box-shadow:3px 3px 0 #aa8e69}.office-plant:before,.office-plant:after{content:'';position:absolute;width:16px;height:29px;border-radius:90% 5% 90% 5%;background:#668b63;top:-23px;left:0;transform:rotate(-25deg)}.office-plant:after{left:9px;transform:rotate(35deg);background:#83a778}
.office-world{margin:1.3rem 0}.office-canvas{width:100%;height:430px;display:block;border:1px solid #bdcfc2;border-radius:18px;background:#edf1e8;touch-action:none;cursor:grab}.office-canvas:active{cursor:grabbing}.office-canvas:focus-visible{outline:3px solid #bd964b;outline-offset:3px}.office-camera{display:flex;gap:.5rem;flex-wrap:wrap;margin:.7rem 0}.office-camera button{border:1px solid #bdcfc2;border-radius:8px;background:#fff;color:#244c4d;padding:.5rem .75rem;font-size:.8rem;min-width:40px;min-height:40px}.office-camera button:hover{background:#dcefe1}.office-world .fine{font-size:.78rem}@media(max-width:700px){.office-canvas{height:320px;border-radius:12px}.office-camera{gap:.35rem}.office-camera button{font-size:.75rem;padding:.4rem .55rem}}
.office-departments{display:flex;flex-wrap:wrap;gap:.45rem;margin:.7rem 0}.office-departments button{background:#fff;border:1px solid #c4d3c6;border-radius:7px;padding:.55rem .7rem;font-size:.78rem;color:#264e50;min-height:40px}.office-game[data-stage='0'] [data-office-spot='0'],.office-game[data-stage='1'] [data-office-spot='1'],.office-game[data-stage='2'] [data-office-spot='2'],.office-game[data-stage='3'] [data-office-spot='3'],.office-game[data-stage='4'] [data-office-spot='3']{background:#dcefe1;border-color:#779b85;font-weight:700}@media(max-width:700px){.office-canvas{height:280px}.office-departments{display:grid;grid-template-columns:1fr 1fr}}