/* Asadin Edu — daylight design system. Legacy token aliases keep dossier components compatible. */
:root{--bg-darkest:#fffdf9;--bg-darker:#f8f5f0;--bg-dark:#f2efea;--bg-card:#fff;--bg-card-hover:#fff8f5;--bg-glass:#f7f4ef;--border-subtle:#e9e4dc;--border-glow:#e8a49d;--cyan-bright:#bc382d;--azure-glow:#366d95;--emerald-neon:#22745a;--amber-solar:#996712;--orange-thermo:#b65420;--violet-quantum:#7252a0;--purple-deep:#7252a0;--rose-relativity:#b83b58;--text-primary:#292b36;--text-secondary:#626370;--text-muted:#676772;--text-accent:#bc382d;--font-display:'Trebuchet MS',Arial,sans-serif;--font-body:'Segoe UI',Arial,sans-serif;--font-mono:ui-monospace,monospace;--shadow-card:0 8px 28px #51413508;--glow-cyan:none;--glow-amber:none;--glow-violet:none;--radius-lg:24px;--radius-md:16px;--nav-height:88px;--max-w:1200px;--red:#bd382c;--red-dark:#a92c22}
html{color-scheme:light;scroll-padding-top:110px}body{background:#fffdf9;background-image:none;overflow-x:visible;font-size:16px;line-height:1.7}h1,h2,h3{letter-spacing:-.035em}h1{font-size:clamp(2rem,4vw,3.7rem)}h2{font-size:clamp(1.55rem,2.3vw,2.2rem)}p{color:var(--text-secondary)}a:hover{color:var(--red-dark);text-shadow:none}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button,summary{cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #346ca8;outline-offset:4px}button,input,select{min-height:44px}button svg,a svg{flex-shrink:0}a{transition:color .18s,background .18s,transform .18s}.content-wrap{max-width:1200px;padding-left:32px;padding-right:32px}.site-main{padding-top:var(--nav-height)}.skip-link{position:fixed;top:-100px;left:16px;z-index:9999;padding:10px 18px;background:#fff;border:2px solid var(--red);border-radius:8px}.skip-link:focus{top:12px}
.navbar{height:var(--nav-height);background:#fffdf9f5;border-bottom:1px solid #ede9e2;backdrop-filter:blur(16px)}.nav-container{max-width:1440px;gap:22px;padding:0 40px}.brand-link{gap:8px;flex-shrink:0}.brand-logo-img{width:47px;height:47px;object-fit:contain;filter:none}.brand-logo-img:hover{transform:none}.brand-name{font-size:1.65rem;letter-spacing:-.075em;font-weight:800;color:#292b36;background:none;-webkit-text-fill-color:initial}.brand-name>span{color:var(--red)}.brand-sub{font-size:.66rem;letter-spacing:.01em;text-transform:none;color:#77737a;font-weight:500;margin-top:-4px}.nav-links{gap:3px}.nav-link{padding:10px 12px;font-size:.88rem;gap:7px;white-space:nowrap;color:#62616b}.nav-link.active{color:var(--red);background:#fff0e9}.nav-link:hover{background:#f6f1ea;color:var(--red)}.nav-actions{gap:12px}.nav-learn{display:flex;align-items:center;gap:10px;background:var(--red);color:#fff;border-radius:12px;padding:11px 16px;font-size:.83rem;font-weight:700;white-space:nowrap}.nav-learn:hover{background:var(--red-dark);color:#fff}.search-trigger-btn{border:0;background:#f5f2ed;border-radius:12px;min-width:44px;min-height:44px;padding:10px 12px;font-size:.8rem;color:#676570;gap:8px}.search-trigger-btn:hover{background:#eee8e0;color:var(--text-primary)}.search-trigger-btn kbd{padding:0 6px;border:1px solid #ddd7ce;border-radius:4px;color:#777;font:12px monospace}.mobile-menu-btn{border-color:#e8e0d6;border-radius:10px;min-width:44px;justify-content:center}.nav-more{position:relative;font-size:.88rem;color:#62616b}.nav-more summary{padding:10px;list-style:none}.nav-more summary::after{content:'⌄';margin-left:5px}.nav-more details>div{position:absolute;top:46px;right:0;min-width:190px;padding:10px;background:white;border:1px solid var(--border-subtle);border-radius:14px;box-shadow:0 15px 40px #37242117}.nav-more a{display:block;padding:8px 10px;color:var(--text-primary);border-radius:6px}.nav-more a:hover{background:#fff0e9}.btn-primary,.btn-secondary{min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:13px 21px;border-radius:12px;font-size:.9rem;font-weight:700;box-shadow:none;letter-spacing:0;text-shadow:none;line-height:1.35;border:1px solid transparent}.btn-primary{background:var(--red);color:white;border-bottom:3px solid var(--red-dark)}.btn-primary:hover{background:var(--red-dark);color:white;box-shadow:none;transform:translateY(-1px)}.btn-secondary{background:white;border-color:#e1dad1;color:#3f414b}.btn-secondary:hover{background:#fff5ef;color:var(--red-dark);border-color:#d8b8ab;transform:translateY(-1px)}.eyebrow{font-size:.68rem;letter-spacing:.12em;color:#8a6558;font-weight:800;display:inline-flex;align-items:center;gap:8px}.text-link{display:inline-flex;align-items:center;gap:9px;font-size:.85rem;font-weight:700;color:var(--red)}
.home-shell{padding-top:0}.welcome-hero{display:grid;grid-template-columns:1.1fr 1fr;gap:35px;align-items:center;min-height:545px;padding:48px 0 36px}.hero-copy h1{font-size:clamp(2.6rem,4.35vw,4rem);line-height:1.13;margin:20px 0;letter-spacing:-.055em;max-width:660px}.hero-copy h1 em{color:var(--red);font-style:normal}.hero-copy>p{max-width:475px;font-size:1rem;line-height:1.8}.little-spark{font-size:18px;color:var(--red)}.hero-actions{display:flex;gap:12px;margin-top:27px;flex-wrap:wrap}.hero-reassurance{display:flex;gap:20px;margin-top:22px;color:#6b6973;font-size:.75rem}.hero-reassurance span{display:flex;align-items:center;gap:6px}.hero-reassurance svg{color:#3f826a}.discovery-art{height:420px;position:relative;background:radial-gradient(ellipse at center,#ffeedb 0%,#fff8ed 56%,transparent 72%);isolation:isolate}.art-orbit{position:absolute;left:8%;top:14%;width:85%;height:70%;border:1px dashed #ddcbbd;border-radius:50%;transform:rotate(-28deg);z-index:-1}.orbit-two{transform:rotate(37deg);width:72%;left:16%;height:62%;top:19%}.art-planet{position:absolute;top:47px;right:75px;width:88px;height:88px;border-radius:50%;background:#e97651;box-shadow:inset -14px -9px 0 #d9583b;transform:rotate(-27deg)}.art-planet:after{content:'';position:absolute;width:145px;height:36px;border:12px solid #efba75;border-top-color:#ffdab0;border-radius:50%;top:25px;left:-28px;transform:rotate(0deg)}.art-book{position:absolute;width:250px;height:163px;top:182px;left:84px;display:flex;transform:rotate(-9deg);filter:drop-shadow(0 17px 12px #bf76531c)}.book-left,.book-right{width:50%;background:#fff;position:relative;border:3px solid #e95845;border-bottom:14px solid #d94636;padding:28px 17px;border-radius:12px 2px 2px 12px;transform:skewY(8deg)}.book-right{border-radius:2px 12px 12px 2px;transform:skewY(-8deg);background:#fff6e9}.art-book i{display:block;width:85%;height:5px;border-radius:3px;background:#e4d7ca;margin:10px 0}.art-book i:nth-child(2){width:65%}.art-book i:first-child{background:#e3a677;width:43%;height:9px}.art-rocket{position:absolute;font-size:76px;left:34px;top:57px;transform:rotate(-16deg)}.art-star{position:absolute;color:#dca144;font-size:32px}.star-one{left:190px;top:58px}.star-two{right:30px;top:180px;font-size:22px;color:#cb6657}.star-three{left:50px;bottom:30px;font-size:40px}.art-note{position:absolute;display:flex;align-items:center;gap:9px;background:#fff;border:1px solid #f0e6d9;box-shadow:0 6px 18px #a6794c0c;border-radius:14px;padding:12px;font-size:23px;line-height:1.35}.art-note span{font-size:11px;color:#81736c}.art-note strong{color:#494048;font-weight:600}.note-gravity{left:2px;top:162px;transform:rotate(-6deg)}.note-light{right:0;bottom:33px;transform:rotate(5deg)}.art-dot{position:absolute;border-radius:50%;background:#df8f79;width:10px;height:10px}.dot-one{right:28px;top:74px}.dot-two{left:185px;bottom:19px;background:#7f9b82;width:13px;height:13px}
.learning-strip{display:flex;align-items:center;gap:18px;padding:21px 25px;border:1px solid #ebe5dc;border-radius:16px;background:white}.strip-icon{display:flex;align-items:center;justify-content:center;background:#fff0e6;color:var(--red);width:49px;height:49px;border-radius:13px;flex-shrink:0}.learning-strip strong{font-size:.95rem}.learning-strip p{font-size:.82rem;margin-top:3px}.learning-strip>a{display:flex;align-items:center;gap:10px;margin-left:auto;white-space:nowrap;font-size:.84rem;font-weight:700}.home-section{padding-top:58px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:25px}.section-heading h2{margin-top:8px}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.topic-tile{position:relative;display:block;border:1px solid #eee5d9;border-radius:21px;padding:24px;min-height:246px;overflow:hidden;color:var(--text-primary)}.topic-tile:hover{transform:translateY(-5px);color:var(--text-primary);border-color:#cfaa95}.peach{background:#fff0e6}.yellow{background:#fcf6dc}.pink{background:#faeaf0}.lavender{background:#eeeafa}.topic-illustration{font-size:55px;display:block;height:92px;filter:drop-shadow(0 7px 5px #6d4a4610)}.topic-number{position:absolute;top:23px;right:23px;font-size:.7rem;color:#71615c}.topic-tile h3{font-size:1.15rem;margin-bottom:5px}.topic-tile p{font-size:.78rem;max-width:85%}.tile-arrow{position:absolute;bottom:21px;right:18px;display:flex;width:29px;height:29px;align-items:center;justify-content:center;border-radius:50%;background:#ffffff8a;color:#695950}.lab-feature{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}.lab-feature h2{max-width:420px;line-height:1.23;margin:13px 0}.lab-feature p{font-size:.94rem;max-width:430px;margin-bottom:22px}.lab-preview{height:298px;background:#edf3eb;border:1px solid #dfe7db;border-radius:24px;position:relative;overflow:hidden;display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:25px;background-image:linear-gradient(#a9bda016 1px,transparent 1px),linear-gradient(90deg,#a9bda016 1px,transparent 1px);background-size:24px 24px}.lab-label{font-size:.66rem;letter-spacing:.13em;font-weight:800;color:#628063}.preview-caption{font-size:.78rem;color:#4f6657}.mini-trajectory{position:absolute;left:12%;top:100px;width:75%;height:125px;border-top:3px dashed #9eaf8a;border-radius:50% 50% 0 0;transform:rotate(0deg)}.launch-ball{position:absolute;top:0;left:65%;width:37px;height:37px;border-radius:50%;background:#e9704c;box-shadow:inset -7px -5px #c74633;transform:translateY(-18px)}.trajectory-ground{position:absolute;bottom:0;left:-12%;right:-12%;height:3px;background:#839b72}.mini-trajectory i{position:absolute;width:7px;height:7px;border-radius:50%;background:#a4b998;left:7%;top:39%}.mini-trajectory i:nth-child(3){left:22%;top:9%}.mini-trajectory i:nth-child(4){left:42%;top:-3%}.mini-trajectory i:nth-child(5){left:85%;top:26%}.mini-trajectory i:nth-child(6){left:94%;top:55%}.lab-footnote{display:block;font-size:.74rem;color:#686773;margin-top:13px}.journey-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.journey-card{padding:22px;border:1px solid #e8e2d9;border-radius:18px;background:#fff;color:var(--text-primary)}.journey-card:hover{border-color:#dc9d8c;transform:translateY(-3px);color:var(--text-primary)}.journey-card>span:first-child{font-size:30px;display:block;margin-bottom:17px}.level-label{font-size:.65rem;letter-spacing:.09em;font-weight:700;color:#8f6a5c}.journey-card h3{font-size:1.05rem;margin:6px 0}.journey-card p{font-size:.8rem;margin-bottom:19px}.journey-card .text-link{font-size:.76rem}.curiosity-banner{display:flex;align-items:center;gap:20px;padding:28px 32px;border-radius:20px;margin:58px 0 20px;background:#fff0e8}.curiosity-banner>span{font-size:38px;color:#cb6a46}.curiosity-banner h2{font-size:1.35rem;margin-bottom:5px}.curiosity-banner p{font-size:.84rem}.curiosity-banner button{margin-left:auto;white-space:nowrap}
.site-footer{background:#f8f5ef;border-top:1px solid #eae3d8;margin-top:70px;padding:50px 0 23px}.footer-grid{grid-template-columns:1.3fr .8fr .9fr 1.1fr;gap:30px}.footer-brand-desc{font-size:.82rem;line-height:1.8}.footer-note{display:block;font-size:.7rem;color:#6c665f;margin-top:15px}.footer-heading{font-size:.75rem;text-transform:none;letter-spacing:0;margin-bottom:17px}.footer-list{gap:8px}.footer-list a{font-size:.8rem}.footer-teacher{padding:18px;border:1px solid #e8ded0;border-radius:14px}.footer-teacher .eyebrow{font-size:.59rem}.footer-teacher h2{font-size:1rem;margin:10px 0}.footer-teacher p,.footer-teacher a{font-size:.76rem}.footer-teacher a{display:flex;align-items:center;gap:8px;margin-top:12px;font-weight:700}.footer-bottom{border-top:1px solid #e7dfd3;padding-top:20px;font-size:.7rem;color:#6c665f}.search-modal-backdrop{background:#3e303c70;backdrop-filter:blur(5px)}.search-modal-box{background:#fffdf9;border:1px solid #e3dace;box-shadow:0 24px 70px #362d3433}.search-main-input{color:var(--text-primary)}.search-result-item:hover{background:#fff0e8}.search-input-row{border-color:var(--border-subtle)}.search-kbd{color:var(--text-secondary);background:#f3eee6;border:1px solid #ddd6cc}.search-item-title{color:var(--text-primary)}.search-item-badge{background:#f6eee7;color:#9b4b36}.domain-card,.entity-card{background:#fff;border:1px solid var(--border-subtle);box-shadow:none}.domain-card:hover,.entity-card:hover{background:#fffaf5;border-color:#dbb3a5;box-shadow:var(--shadow-card);transform:translateY(-3px)}.domain-card-title,.entity-card-title{color:var(--text-primary)}.entity-type-badge,.status-badge,.subtag{color:#665b59;background:#f5f0e9;border-color:#e4dad0}.entity-type-badge{font-size:.65rem}.domain-scale-tag{color:#686269;background:#f5eee6}.entity-symbol{color:#9e4b35;background:#fff1e8}.layer-tab-btn,.sim-btn{background:#fff;border:1px solid var(--border-subtle);color:#53535e;min-height:44px;border-radius:10px;font-weight:600}.layer-tab-btn.active,.sim-btn-active{background:#fff0e9;border-color:#e5afa0;color:#a72d23}.layer-switcher-container{background:#f6f1e9;border:1px solid var(--border-subtle)}.layer-content-card,.equation-card{background:#fff;border-color:var(--border-subtle);box-shadow:none}.equation-display-box{background:#fff4ec;border-color:#ecd3c2}.equation-math{color:#9c332a}.variable-pill{background:#f8f5ee;border-color:#e8dfd2}.variable-sym{color:#af392d}.equation-solver-box{background:#fff7ed;border-color:#f0dfc5}.solver-input,input[type=number],input[type=search],input[type=text],select{background:#fff;color:var(--text-primary);border:1px solid #d8cfc4;border-radius:9px;padding:10px 12px}.source-note{background:#f7f4ee;border-color:#e6e0d5;font-size:.84rem}.source-note strong{font-size:.85rem}.source-note a{overflow-wrap:anywhere}.sim-stage-container{background:#fff;border-color:var(--border-subtle);box-shadow:none}.sim-sidebar{background:#fff;border-color:var(--border-subtle)}.sim-tab-item:hover{background:#faf3ed}.sim-tab-item.active{background:#fff0e8;border-color:#d99d8c;color:#ad3329}.sim-stage-header{background:#fff;border-color:var(--border-subtle)}.sim-title-group h2{color:var(--text-primary);font-size:1.2rem}.sim-controls-panel{background:#f7f4ee;border-color:var(--border-subtle)}.sim-canvas-wrap{background:#101827}.sim-hud-overlay{background:#101827ed;color:#dce5ee}.sim-hud-overlay .hud-val{color:#fff}.sim-range-input{accent-color:var(--red)}.sim-explanation{background:#fff8ed;font-size:.86rem}.sim-control-label{color:#454855}.sim-control-val{color:#a82f24}.sim-mobile-picker select{background:#fff;color:#292b36}.toast{background:#fff;border:1px solid #dec8b4;color:#30313b;box-shadow:0 8px 28px #34262015}.lesson-progress{background:#fff4ec}progress{accent-color:var(--red);width:100%;height:9px}.graph-accessible{background:#fff;border:1px solid var(--border-subtle);border-radius:16px;padding:20px}.quiz-feedback-box{color:#313744}.quiz-option-btn{color:#42404a;background:#fff;border-color:#ded6cd}.quiz-option-btn:hover{background:#fff1e9}.btn-secondary.btn-primary{background:var(--red);color:#fff}
@media(min-width:1201px){.nav-links{display:flex}.mobile-menu-btn{display:none}}
@media(max-width:1200px){.nav-container{padding:0 24px}.nav-links{display:none}.mobile-menu-btn{display:flex}.nav-links.mobile-open{display:flex;position:absolute;top:100%;left:0;right:0;flex-wrap:wrap;max-height:70vh;overflow:auto;background:#fffdf9;border-bottom:1px solid var(--border-subtle);padding:18px 24px;box-shadow:0 10px 25px #392d2410}.nav-more details>div{position:static;box-shadow:none}.nav-learn{display:none}.hero-copy h1{font-size:3.3rem}.art-book{left:55px}.footer-grid{grid-template-columns:1fr 1fr}.discovery-art{transform:scale(.94)}}
@media(max-width:800px){.welcome-hero{grid-template-columns:1fr;gap:0;padding-top:38px}.hero-copy h1{font-size:2.9rem}.hero-copy>p{max-width:520px}.discovery-art{max-width:440px;width:100%;height:370px;margin:auto}.art-book{top:160px}.note-light{bottom:8px}.topic-grid,.journey-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lab-feature{gap:25px}.learning-strip{flex-wrap:wrap}.learning-strip>div{flex:1}.learning-strip>a{margin-left:67px}.curiosity-banner{flex-wrap:wrap}.curiosity-banner button{margin-left:0}.hero-reassurance{gap:12px}.nav-actions{margin-left:auto}.footer-grid{gap:25px}}
@media(max-width:520px){:root{--nav-height:74px}.content-wrap{padding-left:20px;padding-right:20px}.nav-container{padding:0 16px;gap:10px}.brand-name{font-size:1.4rem}.brand-logo-img{width:39px;height:39px}.brand-sub{display:block;font-size:.59rem}.search-trigger-btn span,.search-trigger-btn kbd{display:none}.nav-actions{gap:7px}.hero-copy h1{font-size:2.65rem}.hero-copy>p{font-size:.9rem}.eyebrow{font-size:.61rem}.hero-actions{gap:10px}.hero-actions a{width:100%}.hero-reassurance{font-size:.66rem;justify-content:center}.discovery-art{height:340px;transform:scale(.9);margin-top:-5px;margin-bottom:-10px}.art-book{width:215px;height:144px;left:49px;top:152px}.art-planet{right:37px;top:46px;width:77px;height:77px}.art-rocket{left:20px;font-size:62px}.note-gravity{top:132px;left:-5px}.note-light{right:-10px;bottom:0}.star-one{left:140px}.learning-strip{padding:17px;gap:12px}.learning-strip strong{font-size:.88rem}.learning-strip p{font-size:.77rem}.learning-strip>a{margin-left:0;width:100%;justify-content:center;padding-top:10px;border-top:1px solid #eee7dc}.topic-grid,.journey-grid{gap:12px}.topic-tile{padding:18px 15px;min-height:217px}.topic-illustration{font-size:44px;height:80px}.topic-tile h3{font-size:1rem}.topic-tile p{font-size:.73rem;max-width:95%}.tile-arrow{display:none}.topic-number{right:15px;top:18px}.section-heading{align-items:start}.section-heading>.text-link{font-size:.73rem;white-space:nowrap;margin-top:30px}.section-heading h2{font-size:1.7rem}.lab-feature{grid-template-columns:1fr}.lab-feature .lab-preview{order:2;height:260px}.home-section{padding-top:42px}.journey-card{padding:18px 14px}.journey-card h3{font-size:.94rem}.journey-card p{font-size:.76rem}.journey-card .text-link{font-size:.69rem}.curiosity-banner{padding:23px;margin-top:42px;gap:14px}.curiosity-banner>span{display:none}.curiosity-banner h2{font-size:1.2rem}.curiosity-banner button{width:100%;white-space:normal}.footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}.footer-grid>div:first-child,.footer-teacher{grid-column:1/-1}.footer-bottom{font-size:.65rem}.site-footer{margin-top:48px}.sim-hud-overlay{color:#dce5ee}.sim-canvas{height:360px}.dossier-layout>div{padding:18px!important}.search-modal-box{width:calc(100% - 24px);margin:60px auto}.search-main-input{font-size:1rem}.source-note{padding:15px}.btn-primary,.btn-secondary{width:auto}.hero-actions .btn-primary,.hero-actions .btn-secondary{width:100%}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media print{.navbar,.site-footer,.search-modal-backdrop,.lesson-actions,button{display:none!important}.site-main{padding:0}body{background:white;color:black}.content-wrap{max-width:none}.source-note{break-inside:avoid}}
/* Learning workspace and focused lesson reader */
.page-heading{padding:40px 0 24px}.page-heading h1{font-size:2.6rem;margin:9px 0 12px}.page-heading p{max-width:710px;font-size:.95rem}.level-tabs{display:flex;gap:10px;flex-wrap:wrap;margin:6px 0 25px}.level-tab{display:flex;gap:8px;align-items:center;background:#fff;border:1px solid #e2dbd1;padding:11px 20px;border-radius:12px;color:#5d5a64;font-weight:650;font-size:.88rem}.level-tab.selected{background:#fff0e7;color:#ac3227;border-color:#dd9e8b}.level-tab>span{font-size:19px}.study-overview{display:grid;grid-template-columns:1.6fr 1fr;background:#fbefe3;border:1px solid #eddbc9;border-radius:22px;padding:32px;gap:35px;align-items:center}.study-overview h2{margin:7px 0 10px}.study-overview p{max-width:540px;font-size:.92rem}.study-overview .btn-primary{margin-top:22px}.study-progress-card{background:#ffffffb8;padding:24px;border-radius:16px;border:1px solid #eaded1}.progress-label{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.progress-label strong{font-size:1.8rem;color:#ac382c}.progress-label strong span{font-size:1rem;font-weight:500;color:#74635b}.progress-label>span{font-size:.76rem}.study-progress-card p{display:flex;align-items:center;gap:7px;margin:10px 0;font-size:.82rem;color:#42705a}.study-progress-card small{color:#776f6d;font-size:.7rem;line-height:1.6;display:block}.study-workspace{display:grid;grid-template-columns:minmax(0,1fr) 285px;gap:32px;margin:38px 0}.catalog-toolbar{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:18px}.catalog-toolbar h2{font-size:1.4rem}.text-button{background:none;border:0;color:var(--red);font-weight:650;font-size:.8rem;padding:5px}.field-search{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--border-subtle);border-radius:12px;padding:0 15px;color:#89818a}.field-search input{width:100%;border:0;background:none;padding:12px 0;outline-offset:0}.result-count{font-size:.76rem;margin:12px 0 16px;color:#706764}.lesson-cards{display:flex;flex-direction:column;gap:12px}.study-card{display:flex;align-items:flex-start;gap:18px;padding:22px;background:#fff;border:1px solid #e9e1d7;border-radius:16px;color:var(--text-primary)}.study-card:hover{background:#fffbf5;border-color:#dba88f;color:var(--text-primary)}.study-card-number{font-size:.78rem;color:#7e5b4e;background:#f7f0e6;border-radius:10px;width:38px;height:38px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.card-kicker{font-size:.65rem;font-weight:700;color:#75625c}.study-card h3{font-size:1.08rem;margin:4px 0 7px;letter-spacing:-.02em}.study-card p{font-size:.82rem;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-meta{display:flex;gap:12px;flex-wrap:wrap;font-size:.67rem;color:#706561;margin-top:12px}.done-mark{color:#347359;font-weight:650}.study-card-arrow{color:var(--red);margin-left:auto;align-self:center}.study-tools{display:flex;flex-direction:column;gap:16px;padding-top:4px}.tool-card{padding:22px;background:#fff;border:1px solid var(--border-subtle);border-radius:16px}.tool-icon{display:flex;color:#ab6250;background:#fff1e5;border-radius:11px;width:44px;height:44px;align-items:center;justify-content:center;margin-bottom:15px}.tool-card h3{font-size:1.05rem;margin-bottom:8px}.tool-card p{font-size:.8rem;margin-bottom:13px}.tool-card>a{font-size:.8rem;font-weight:700;display:flex;align-items:center;gap:8px}.tool-card button{font-size:.77rem}.reset-progress{font-size:.74rem;margin-top:15px}.reset-progress p{font-size:.73rem;margin:12px 0}.teacher-callout{display:flex;align-items:center;gap:13px;background:#f3eee7;border-radius:15px;padding:18px;color:#6e5445}.teacher-callout strong{font-size:.83rem;display:block}.teacher-callout small{font-size:.69rem;display:block}.breadcrumb{display:flex;gap:9px;flex-wrap:wrap;font-size:.77rem;color:#6f635d;padding:27px 0}.reader-layout{display:grid;grid-template-columns:215px minmax(0,1fr);gap:48px}.reader-sidebar{align-self:start;position:sticky;top:110px;padding-top:5px}.back-link{font-size:.79rem;display:block;margin-bottom:27px}.reader-sidebar>.eyebrow{font-size:.59rem}.reader-sidebar nav{display:flex;flex-direction:column;gap:3px;margin:15px 0 24px;border-left:2px solid #eee4d8}.reader-sidebar nav a{font-size:.8rem;padding:8px 15px;color:#777077}.reader-sidebar nav a:hover{background:#fff0e6;color:var(--red)}.reader-sidebar .btn-secondary{font-size:.77rem;min-height:42px;padding:9px 14px}.prerequisite{padding:16px;background:#f5f0e8;border-radius:12px;margin-bottom:20px}.prerequisite small{display:block;font-size:.65rem;color:#706158;margin-bottom:5px}.prerequisite a{font-size:.76rem}.lesson-reader{max-width:790px;padding-bottom:35px}.reader-header h1{font-size:2.65rem;margin:18px 0;line-height:1.17}.reader-header>p{font-size:1.04rem;line-height:1.8}.reader-meta{display:flex;align-items:center;gap:15px;flex-wrap:wrap;font-size:.73rem;color:#74655f}.lesson-chip{background:#ffebe2;color:#aa392b;border:1px solid #f0cebd;border-radius:7px;padding:4px 10px;font-size:.68rem;font-weight:700}.learning-objectives{margin:28px 0;padding:22px 26px;background:#f5f3ea;border:1px solid #e8e2d3;border-radius:16px}.learning-objectives h2{font-size:1.02rem;margin-bottom:12px}.learning-objectives ul{display:flex;flex-wrap:wrap;gap:8px;list-style:none}.learning-objectives li{font-size:.74rem;background:#fff;border:1px solid #e6dfd4;padding:4px 10px;border-radius:7px;color:#76665e}.reader-section{padding-top:23px;margin-bottom:22px;scroll-margin-top:110px}.reader-section-heading{display:flex;align-items:center;gap:13px;margin-bottom:18px}.reader-section-heading>span{font-size:.68rem;background:#fff0e6;border-radius:7px;color:#ac4c36;padding:5px 8px}.reader-section-heading h2{font-size:1.35rem}.reading-depth{display:flex;gap:6px;padding:5px;background:#f3eee7;border-radius:11px;margin-bottom:23px;max-width:max-content}.reading-depth button{font-size:.77rem;padding:7px 14px;background:none;border:1px solid transparent;border-radius:8px;color:#746961;min-height:38px}.reading-depth button[aria-pressed=true]{background:#fff;color:var(--red);border-color:#e5d9cb;box-shadow:0 2px 5px #6b4a3308}.reader-prose p{font-size:1rem;line-height:1.9;margin-bottom:18px;color:#464751}.worked-example{background:#fff6e9;border:1px solid #ecdcc2;border-left:4px solid #d49b4a;border-radius:13px;padding:23px}.worked-example p{color:#5b5149;line-height:1.9;font-size:.95rem;margin-bottom:12px}.worked-example p:last-child{margin-bottom:0}.reflection{font-size:.84rem;margin-top:14px;padding:14px;border-bottom:1px solid #e7dfd4}.reflection summary{font-weight:600}.reflection p{padding-top:12px;line-height:1.8}.activity-panel{display:flex;gap:16px;background:#f0f5ee;border:1px solid #dfe7d8;border-radius:14px;padding:22px;color:#608063}.activity-panel>svg{flex-shrink:0;margin-top:4px}.activity-panel p{font-size:.92rem;color:#4d6350;line-height:1.8;margin-bottom:10px}.activity-panel .btn-secondary{font-size:.78rem;margin-top:10px}.practice-intro{font-size:.84rem;margin-bottom:16px}.lesson-quiz{border:0;min-width:0}.lesson-quiz legend{font-size:1.03rem;font-weight:650;color:#363842;padding-bottom:17px}.lesson-quiz .quiz-option-btn{display:flex;width:100%;align-items:center;gap:13px;text-align:left;padding:14px 16px;border-radius:12px;font-size:.87rem;margin-bottom:10px;min-height:56px}.lesson-quiz .quiz-option-btn>span{display:flex;justify-content:center;align-items:center;border:1px solid #e0d8cb;border-radius:7px;width:26px;height:26px;font-size:.69rem;flex-shrink:0}.quiz-feedback-box[hidden]{display:none!important}.lesson-quiz .quiz-feedback-box{display:block;border-radius:12px;padding:20px;margin-top:18px;background:#fff3e2;border:1px solid #e6cb9f}.lesson-quiz .quiz-feedback-box.correct{background:#ecf5eb;border-color:#c9dec2}.quiz-feedback-box p{font-size:.85rem;margin:9px 0}.quiz-feedback-box .btn-secondary{font-size:.75rem;margin-top:8px}.reader-section>label{display:block;font-size:.85rem;color:#766c66;margin-bottom:10px}#lesson-notes{width:100%;min-height:155px;resize:vertical;padding:15px;font:inherit;font-size:.93rem;border:1px solid #dcd3c6;border-radius:12px;background:#fff;color:#34343d;line-height:1.8}.save-status,.scope-note{font-size:.75rem;color:#756154;margin-top:9px}.teacher-plan{border:1px solid #e1d6c8;border-radius:18px;background:#fbf6ed;padding:25px;margin:30px 0}.teacher-plan h2{font-size:1.3rem;margin:10px 0 20px}.teacher-plan dt{font-size:.88rem;font-weight:700;margin-top:17px}.teacher-plan dd{font-size:.86rem;color:#6e645e;line-height:1.8;margin-top:5px}.teacher-plan button{margin-top:20px}.reader-sources{border-top:1px solid #e5dcd0;padding-top:24px;margin-top:35px}.reader-sources h2{font-size:1rem;margin-bottom:12px}.reader-sources a{font-size:.8rem;overflow-wrap:anywhere}.reader-sources p{font-size:.76rem;line-height:1.7;margin-top:10px}.reader-sources h3{font-size:.86rem;margin-top:20px}.lesson-actions{border-top:1px solid #e5dcd0;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-top:30px;padding-top:25px}.lesson-actions button,.lesson-actions a{font-size:.79rem}.empty-state{text-align:center;padding:60px 20px}.empty-state p{margin:15px 0 25px}.completion-message{font-size:.9rem;margin-top:15px}
@media(max-width:900px){.study-workspace{grid-template-columns:minmax(0,1fr) 235px;gap:20px}.reader-layout{grid-template-columns:170px minmax(0,1fr);gap:25px}.reader-header h1{font-size:2.3rem}.study-overview{padding:25px;gap:25px}.study-progress-card{padding:18px}}
@media(max-width:700px){.study-workspace{grid-template-columns:1fr}.study-tools{display:grid;grid-template-columns:1fr 1fr}.study-overview{grid-template-columns:1fr}.reader-layout{display:block}.reader-sidebar{position:static;padding:0 0 20px}.reader-sidebar>nav,.reader-sidebar>.eyebrow,.reader-sidebar .prerequisite,.reader-sidebar .print-lesson{display:none}.back-link{margin:0}.reader-header h1{font-size:2.3rem}.page-heading h1{font-size:2.3rem}.lesson-actions>*{flex:1;text-align:center}.level-tabs{gap:7px}.level-tab{padding:9px 13px;font-size:.8rem}.study-card{padding:17px;gap:12px}.study-card-number{width:29px;height:29px;font-size:.65rem}.study-card-arrow{display:none}.study-card h3{font-size:1rem}.study-card p{font-size:.8rem}.catalog-toolbar h2{font-size:1.2rem}.tool-card{padding:18px}.reader-prose p{font-size:.95rem}.reader-section-heading h2{font-size:1.2rem}}
@media(max-width:400px){.study-tools{grid-template-columns:1fr}.reader-header h1{font-size:2rem}.reading-depth{gap:0}.reading-depth button{padding:7px 10px;font-size:.73rem}.worked-example,.activity-panel{padding:17px}.learning-objectives{padding:18px}.level-tab{padding:8px 10px}.study-overview{padding:20px}.study-card-number{display:none}.reader-meta{gap:9px}}
@media print{.reader-sidebar,.level-tabs,.study-tools,.reading-depth,.lesson-quiz button,.breadcrumb{display:none!important}.reader-layout{display:block}.lesson-reader{max-width:none}.reader-section{break-inside:avoid}.teacher-plan{break-before:page}.reader-prose p{color:#000}.reader-header h1{font-size:24pt}.reader-meta{display:none}}
.about-rebuild{max-width:1060px}.about-intro{background:#fff0e4;border:1px solid #efdcc9;border-radius:22px;padding:32px;margin:8px 0 35px}.about-intro h2{font-size:1.55rem;margin-bottom:14px}.about-intro p{font-size:.95rem}.about-counts{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:15px;margin-top:28px}.about-counts div{display:flex;flex-direction:column}.about-counts strong{font-size:1.8rem;color:var(--red)}.about-counts span{font-size:.72rem;color:#755b4e}.about-section{padding:24px 0}.about-section h2{font-size:1.5rem;margin-bottom:16px}.about-section>p{font-size:.92rem;line-height:1.85;margin-bottom:18px}.about-levels{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:13px;margin:20px 0}.about-levels a,.reference-grid a{padding:21px;border:1px solid #e7ded2;background:#fff;border-radius:15px;color:var(--text-primary)}.about-levels h3{font-size:1rem;margin:9px 0}.about-levels p,.reference-grid p{font-size:.78rem}.reference-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.reference-grid h3{font-size:1rem;margin-bottom:9px}.science-status-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.science-status-grid>div{background:#f5f1e9;border-radius:15px;padding:22px}.science-status-grid strong{font-size:.9rem}.science-status-grid p{font-size:.8rem;margin-top:9px}@media(max-width:600px){.about-counts{grid-template-columns:repeat(3,1fr)}.about-intro{padding:24px}.reference-grid,.science-status-grid{grid-template-columns:1fr}}
.entity-study-links{padding:23px;border:1px solid #ecd6c7;background:#fff5ec;border-radius:16px;margin:20px 0}.entity-study-links h2{font-size:1.1rem}.entity-study-links a{font-size:.84rem;font-weight:600}
.journey-grid{grid-template-columns:repeat(5,minmax(0,1fr))}.journey-card h3{line-height:1.35}.lesson-quiz .quiz-option-btn{border:1px solid #ded6cd;box-shadow:none}@media(max-width:900px){.journey-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:600px){.journey-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.journey-card:last-child{grid-column:1/-1}.journey-card:last-child>span:first-child{float:left;margin-right:16px}}

/* Readable metadata and links on warm light surfaces. */
#main-slot p a, .source-panel a, .source-note a, .reader-sources a{text-decoration:underline;text-underline-offset:3px}
@media(max-width:600px){.section-heading{flex-wrap:wrap}.section-heading .text-link{flex-shrink:0}}

textarea:focus-visible{outline:3px solid #346ca8;outline-offset:4px}
@media print{.lesson-quiz .quiz-option-btn{display:flex!important;color:#111;background:white;opacity:1}.skip-link,#copy-lesson-link,#share-status{display:none!important}}

@media(max-width:600px){.lab-preview .mini-trajectory{top:80px;height:100px}}
.search-kbd{color:#565762;background:#f4efe8;border:1px solid #d7cfc5}