:root{--ncert-blue:#1d4ed8;--ncert-blue-dark:#1e40af;--ncert-blue-mid:#2563eb;--ncert-blue-pale:#eff6ff;--ncert-blue-border:#bfdbfe;--ncert-explainer-bg:#eff6ff;--ncert-explainer-border:#3b82f6;--ncert-explainer-text:#1e40af;--ncert-bridge-bg:#fffbeb;--ncert-bridge-border:#f59e0b;--ncert-bridge-text:#92400e;--ncert-upsc-bg:#f0fdf4;--ncert-upsc-border:#22c55e;--ncert-upsc-text:#14532d;--ncert-fact-bg:#fefce8;--ncert-fact-border:#eab308;--ncert-fact-text:#713f12}.ncert-header{background:linear-gradient(135deg,#1e3a8a 0,#1d4ed8 60%,#2563eb 100%);color:#fff;padding:var(--space-10) 0 var(--space-8)}.ncert-header .breadcrumb a{color:rgba(255,255,255,.75)}.ncert-header .breadcrumb a:hover{color:#fff}.ncert-header .breadcrumb__sep{color:rgba(255,255,255,.4)}.ncert-header__meta{display:flex;align-items:center;gap:var(--space-2);flex-wrap:wrap;margin-bottom:var(--space-4)}.ncert-gs-badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:var(--radius-sm);font-size:var(--text-xs);font-weight:var(--font-bold);text-transform:uppercase;letter-spacing:.06em;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.35);color:#fff}.ncert-class-badge{display:inline-flex;align-items:center;gap:var(--space-2);background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.3);border-radius:var(--radius-full);padding:var(--space-1) var(--space-4);font-size:var(--text-xs);font-weight:var(--font-semibold);letter-spacing:.06em;text-transform:uppercase;color:rgba(255,255,255,.9);margin-bottom:0}.ncert-chapter-number{font-family:var(--font-body);font-size:var(--text-xs);font-weight:var(--font-bold);letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.6);margin-bottom:var(--space-2)}.ncert-header h1{font-family:var(--font-heading);font-size:clamp(1.5rem, 4vw, 2.25rem);font-weight:var(--font-bold);color:#fff;line-height:var(--leading-tight);margin-bottom:var(--space-3)}.ncert-header__subtitle{font-size:var(--text-base);color:rgba(255,255,255,.8);line-height:var(--leading-relaxed);max-width:680px}.ncert-book-tag{display:inline-flex;align-items:center;gap:var(--space-2);background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:var(--radius-md);padding:var(--space-2) var(--space-3);font-size:var(--text-xs);color:rgba(255,255,255,.85);margin-top:var(--space-4)}.ncert-article{font-size:var(--text-base);line-height:var(--leading-relaxed);color:var(--color-text)}.ncert-article h2{font-family:var(--font-heading);font-size:var(--text-xl);font-weight:var(--font-bold);color:var(--ncert-blue-dark);margin-top:var(--space-10);margin-bottom:var(--space-4);padding-bottom:var(--space-3);border-bottom:2px solid var(--ncert-blue-border)}.ncert-article h3{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--ncert-blue-dark);margin-top:var(--space-6);margin-bottom:var(--space-3)}.ncert-article h4{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--ncert-blue-mid);text-transform:uppercase;letter-spacing:.04em;margin-top:var(--space-4);margin-bottom:var(--space-1)}.ncert-article .table-scroll{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--color-border-light);box-shadow:0 2px 6px rgba(0,0,0,.05);margin:var(--space-5) 0}.ncert-article .table-scroll-inner{overflow-x:auto;-webkit-overflow-scrolling:touch}.ncert-article table{border-collapse:collapse;border-spacing:0;width:100%;font-size:var(--text-sm);border:none;box-shadow:none;border-radius:0;margin:0;background:#fff}.ncert-article th{background:#1e293b;color:#f1f5f9;padding:11px var(--space-4);text-align:left;font-weight:var(--font-semibold);font-size:var(--text-xs);letter-spacing:.07em;text-transform:uppercase;white-space:normal;border:none}.ncert-article td{padding:11px var(--space-4);border-bottom:1px solid var(--color-border-light);color:var(--color-text);line-height:1.65;vertical-align:top;font-size:var(--text-sm);background:#fff}.ncert-article td:first-child{font-weight:var(--font-semibold);color:var(--color-text);background:#fff}.ncert-article tr:last-child td{border-bottom:none}.ncert-article tr:nth-child(2n) td{background:rgba(30,41,59,.02)}.ncert-article tr:hover td{background:rgba(30,41,59,.04)}.ncert-box__body .table-scroll{border-color:rgba(0,0,0,.1);box-shadow:none;margin-top:var(--space-4)}.ncert-box--explainer .ncert-box__body th{background:#1e3a5f}.ncert-box--bridge .ncert-box__body th{background:#78350f}.ncert-box--upsc .ncert-box__body th{background:#14532d}.ncert-box--fact .ncert-box__body th{background:#713f12}.ncert-box--explainer .ncert-box__body td{border-bottom-color:rgba(59,130,246,.15)}.ncert-box--bridge .ncert-box__body td{border-bottom-color:rgba(245,158,11,.15)}.ncert-box--upsc .ncert-box__body td{border-bottom-color:rgba(34,197,94,.15)}.ncert-box--fact .ncert-box__body td{border-bottom-color:rgba(234,179,8,.18)}.ncert-box--bridge .ncert-box__body td:first-child,.ncert-box--explainer .ncert-box__body td:first-child,.ncert-box--fact .ncert-box__body td:first-child,.ncert-box--upsc .ncert-box__body td:first-child{background:0 0;border-right:none}.ncert-box--explainer .ncert-box__body tr:hover td{background:rgba(59,130,246,.05)}.ncert-box--bridge .ncert-box__body tr:hover td{background:rgba(245,158,11,.05)}.ncert-box--upsc .ncert-box__body tr:hover td{background:rgba(34,197,94,.05)}.ncert-box--fact .ncert-box__body tr:hover td{background:rgba(234,179,8,.05)}.ncert-article td.ncert-num-col{background:#fff!important;border-right:none!important;font-weight:var(--font-normal)!important;text-align:center;color:var(--color-text-muted);width:2.5rem;min-width:2.5rem}.ncert-box--explainer{background:var(--ncert-explainer-bg);border-left:4px solid var(--ncert-explainer-border);border-radius:0 var(--radius-md) var(--radius-md) 0;padding:var(--space-5) var(--space-6);margin:var(--space-6) 0}.ncert-box--explainer .ncert-box__title{color:var(--ncert-explainer-text);font-size:var(--text-sm);font-weight:var(--font-bold);text-transform:uppercase;letter-spacing:.06em;margin-bottom:var(--space-3);display:flex;align-items:center;gap:var(--space-2)}.ncert-box--explainer .ncert-box__title::before{content:"💡";font-style:normal;font-family:"Apple Color Emoji","Segoe UI Emoji","Noto Color Emoji",sans-serif}.ncert-box--bridge{background:var(--ncert-bridge-bg);border-left:4px solid var(--ncert-bridge-border);border-radius:0 var(--radius-md) var(--radius-md) 0;padding:var(--space-5) var(--space-6);margin:var(--space-6) 0}.ncert-box--bridge .ncert-box__title{color:var(--ncert-bridge-text);font-size:var(--text-sm);font-weight:var(--font-bold);text-transform:uppercase;letter-spacing:.06em;margin-bottom:var(--space-3);display:flex;align-items:center;gap:var(--space-2)}.ncert-box--bridge .ncert-box__title::before{content:"🔗";font-style:normal;font-family:"Apple Color Emoji","Segoe UI Emoji","Noto Color Emoji",sans-serif}.ncert-box--upsc{background:var(--ncert-upsc-bg);border:1px solid var(--ncert-upsc-border);border-left:4px solid var(--ncert-upsc-border);border-radius:0 var(--radius-md) var(--radius-md) 0;padding:var(--space-5) var(--space-6);margin:var(--space-6) 0}.ncert-box--upsc .ncert-box__title{color:var(--ncert-upsc-text);font-size:var(--text-sm);font-weight:var(--font-bold);text-transform:uppercase;letter-spacing:.06em;margin-bottom:var(--space-3);display:flex;align-items:center;gap:var(--space-2)}.ncert-box--upsc .ncert-box__title::before{content:"🎯";font-style:normal;font-family:"Apple Color Emoji","Segoe UI Emoji","Noto Color Emoji",sans-serif}.ncert-box--fact{background:var(--ncert-fact-bg);border-left:4px solid var(--ncert-fact-border);border-radius:0 var(--radius-md) var(--radius-md) 0;padding:var(--space-5) var(--space-6);margin:var(--space-6) 0}.ncert-box--fact .ncert-box__title{color:var(--ncert-fact-text);font-size:var(--text-sm);font-weight:var(--font-bold);text-transform:uppercase;letter-spacing:.06em;margin-bottom:var(--space-3);display:flex;align-items:center;gap:var(--space-2)}.ncert-box--fact .ncert-box__title::before{content:"📌";font-style:normal;font-family:"Apple Color Emoji","Segoe UI Emoji","Noto Color Emoji",sans-serif}.ncert-box__body{font-size:var(--text-sm);line-height:var(--leading-relaxed);color:var(--color-text)}.ncert-box__body ol:last-child,.ncert-box__body p:last-child,.ncert-box__body ul:last-child{margin-bottom:0}.ncert-book-info-card{background:var(--ncert-blue-pale);border:1px solid var(--ncert-blue-border);border-radius:var(--radius-lg);padding:var(--space-5);margin-bottom:var(--space-5)}.ncert-book-info-card__label{font-size:var(--text-xs);font-weight:var(--font-bold);text-transform:uppercase;letter-spacing:.06em;color:var(--ncert-blue);margin-bottom:var(--space-3)}.ncert-book-info-card__item{font-size:var(--text-xs);color:var(--color-text-secondary);margin-bottom:var(--space-2);display:grid;grid-template-columns:64px 1fr;gap:var(--space-2);align-items:baseline}.ncert-book-info-card__item strong{color:var(--color-text);font-weight:var(--font-semibold);flex-shrink:0}.ncert-book-info-card__item span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ncert-header~section .topic-sidebar{top:60px}.ncert-hub-header{background:linear-gradient(135deg,#0f2d6b 0,#1d4ed8 100%);color:#fff;padding:var(--space-16) 0 var(--space-12);text-align:center}.ncert-hub-header h1{font-family:var(--font-heading);font-size:clamp(2rem, 5vw, 3rem);font-weight:var(--font-bold);color:#fff;margin-bottom:var(--space-4)}.ncert-hub-header p{font-size:var(--text-lg);color:rgba(255,255,255,.85);max-width:640px;margin:0 auto;line-height:var(--leading-relaxed)}.ncert-phase-badge{display:inline-block;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.3);border-radius:var(--radius-full);padding:var(--space-1) var(--space-5);font-size:var(--text-xs);font-weight:var(--font-semibold);letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.9);margin-bottom:var(--space-5)}.ncert-class-section{padding:var(--space-12) 0}.ncert-class-section+.ncert-class-section{border-top:1px solid var(--color-border-light)}.ncert-class-heading{font-family:var(--font-heading);font-size:var(--text-2xl);font-weight:var(--font-bold);color:var(--ncert-blue-dark);margin-bottom:var(--space-2)}.ncert-class-desc{font-size:var(--text-base);color:var(--color-text-secondary);margin-bottom:var(--space-8)}.ncert-book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--space-5)}.ncert-book-card{background:var(--color-surface);border:1px solid var(--color-border);border-top:3px solid var(--ncert-blue);border-radius:var(--radius-lg);padding:var(--space-6);text-decoration:none;color:var(--color-text);transition:box-shadow var(--transition-normal),transform var(--transition-normal);display:flex;flex-direction:column;gap:var(--space-3)}.ncert-book-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-2px);border-top-color:var(--ncert-blue-mid)}.ncert-book-card__subject{font-size:var(--text-xs);font-weight:var(--font-semibold);text-transform:uppercase;letter-spacing:.06em;color:var(--ncert-blue)}.ncert-book-card__title{font-family:var(--font-heading);font-size:var(--text-lg);font-weight:var(--font-bold);color:var(--color-brand);line-height:var(--leading-snug)}.ncert-book-card__meta{font-size:var(--text-xs);color:var(--color-text-muted);display:flex;gap:var(--space-3);align-items:center}.ncert-book-card__chapters{font-size:var(--text-xs);font-weight:var(--font-semibold);color:var(--ncert-blue);margin-top:auto;padding-top:var(--space-3);border-top:1px solid var(--color-border-light)}.ncert-class-grid__heading{font-family:var(--font-heading);font-size:var(--text-xl);font-weight:var(--font-bold);color:var(--color-brand);margin:0 0 var(--space-5)}.ncert-class-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--space-5)}.ncert-class-card{display:flex;flex-direction:column;gap:var(--space-4);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6);text-decoration:none;color:var(--color-text);transition:box-shadow var(--transition-normal),transform var(--transition-normal),border-color var(--transition-normal)}.ncert-class-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-3px);border-color:var(--ncert-blue-border)}.ncert-class-card__top{display:flex;align-items:center;gap:var(--space-4)}.ncert-class-card__num{flex:none;width:3rem;height:3rem;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);background:var(--ncert-blue-pale);color:var(--ncert-blue-dark);font-family:var(--font-heading);font-weight:var(--font-bold);font-size:var(--text-lg);letter-spacing:.02em}.ncert-class-card:hover .ncert-class-card__num{background:var(--ncert-blue);color:#fff}.ncert-class-card__eyebrow{font-size:var(--text-xs);font-weight:var(--font-semibold);text-transform:uppercase;letter-spacing:.06em;color:var(--ncert-blue)}.ncert-class-card__title{font-family:var(--font-heading);font-size:var(--text-xl);font-weight:var(--font-bold);color:var(--color-brand);line-height:var(--leading-snug)}.ncert-class-card__blurb{font-size:var(--text-sm);color:var(--color-text-muted);line-height:var(--leading-relaxed);margin:0}.ncert-class-card__subjects{display:flex;flex-wrap:wrap;gap:var(--space-2)}.ncert-class-card__chip{font-size:var(--text-xs);font-weight:var(--font-medium);color:var(--ncert-blue-dark);background:var(--ncert-blue-pale);border:1px solid var(--ncert-blue-border);border-radius:var(--radius-full);padding:.15rem var(--space-3);white-space:nowrap}.ncert-class-card__foot{display:flex;align-items:center;gap:var(--space-4);margin-top:auto;padding-top:var(--space-4);border-top:1px solid var(--color-border-light);font-size:var(--text-xs);color:var(--color-text-muted)}.ncert-class-card__cta{margin-left:auto;font-weight:var(--font-semibold);color:var(--ncert-blue)}.ncert-subjects{margin-bottom:var(--space-12)}.ncert-subjects__heading{font-family:var(--font-heading);font-size:var(--text-xl);font-weight:var(--font-bold);color:var(--color-brand);margin:0 0 var(--space-2)}.ncert-subjects__lede{font-size:var(--text-sm);color:var(--color-text-muted);line-height:var(--leading-relaxed);margin:0 0 var(--space-6);max-width:60ch}.ncert-subjects__grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:var(--space-5)}.subject-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-5) var(--space-5) var(--space-2);display:flex;flex-direction:column}.subject-card__head{display:flex;align-items:center;gap:var(--space-3);padding-bottom:var(--space-4);margin-bottom:var(--space-2);border-bottom:2px solid var(--ncert-blue-pale)}.subject-card__icon{flex:none;width:2.5rem;height:2.5rem;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);background:var(--ncert-blue-pale);font-size:var(--text-lg)}.subject-card__name{font-family:var(--font-heading);font-size:var(--text-lg);font-weight:var(--font-bold);color:var(--color-brand);line-height:var(--leading-snug)}.subject-card__note{font-size:var(--text-xs);color:var(--color-text-muted)}.subject-card__steps{list-style:none;counter-reset:step;margin:0;padding:0}.subject-card__step{counter-increment:step;border-bottom:1px solid var(--color-border-light)}.subject-card__step:last-child{border-bottom:none}.subject-card__link{display:flex;flex-direction:column;gap:2px;padding:var(--space-3) 0 var(--space-3) var(--space-6);position:relative;text-decoration:none;transition:color var(--transition-fast)}.subject-card__link::before{content:counter(step);position:absolute;left:0;top:var(--space-3);width:1.25rem;height:1.25rem;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-full);background:var(--ncert-blue-pale);color:var(--ncert-blue-dark);font-size:.7rem;font-weight:var(--font-bold)}.subject-card__step--core .subject-card__link::before{background:var(--ncert-blue);color:#fff}.subject-card__label{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-text);line-height:var(--leading-snug)}.subject-card__link:hover .subject-card__label{color:var(--ncert-blue)}.subject-card__badge{display:inline-block;font-size:.6rem;font-weight:var(--font-bold);text-transform:uppercase;letter-spacing:.05em;color:var(--ncert-blue-dark);background:var(--ncert-blue-pale);border-radius:var(--radius-sm);padding:1px 5px;vertical-align:middle}.subject-card__sub{font-size:var(--text-xs);color:var(--color-text-muted)}.ncert-chapter-list{list-style:none;padding:0;margin:0}.ncert-chapter-list__item{border-bottom:1px solid var(--color-border-light)}.ncert-chapter-list__item:last-child{border-bottom:none}.ncert-chapter-list__link{display:flex;align-items:center;gap:var(--space-4);padding:var(--space-4) var(--space-3);text-decoration:none;color:var(--color-text);border-radius:var(--radius-md);transition:background var(--transition-fast)}.ncert-chapter-list__link:hover{background:var(--ncert-blue-pale);color:var(--ncert-blue-dark)}.ncert-chapter-list__num{min-width:2rem;height:2rem;background:var(--ncert-blue-pale);border:1px solid var(--ncert-blue-border);border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;font-size:var(--text-xs);font-weight:var(--font-bold);color:var(--ncert-blue);flex-shrink:0}.ncert-chapter-list__title{font-size:var(--text-base);font-weight:var(--font-medium);line-height:var(--leading-snug);flex:1}.ncert-chapter-list__arrow{color:var(--color-text-muted);font-size:var(--text-sm);flex-shrink:0}.ncert-toc-card{background:var(--color-surface);border:1px solid var(--ncert-blue-border);border-top:3px solid var(--ncert-blue);border-radius:var(--radius-lg);margin-bottom:var(--space-5);overflow:hidden}.ncert-toc-card__header{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);background:var(--ncert-blue-pale);border-bottom:1px solid var(--ncert-blue-border)}.ncert-toc-card__header>svg{color:var(--ncert-blue);flex-shrink:0}.ncert-toc-card__header>span:nth-child(2){flex:1;font-size:var(--text-xs);font-weight:var(--font-bold);text-transform:uppercase;letter-spacing:.07em;color:var(--ncert-blue-dark)}.ncert-toc-card__count{font-size:10px;font-weight:var(--font-semibold);color:var(--ncert-blue-mid);background:#fff;border:1px solid var(--ncert-blue-border);border-radius:99px;padding:1px 7px;white-space:nowrap;flex-shrink:0}.ncert-toc-card .toc-list{list-style:none;padding:var(--space-2) 0;margin:0}.ncert-toc-card .toc-list li{counter-increment:none!important}.ncert-toc-card .toc-list a::before{display:none!important}.ncert-toc-card .toc-link{display:flex;align-items:baseline;gap:var(--space-2);font-size:var(--text-xs);color:var(--color-text-secondary);text-decoration:none;padding:5px var(--space-3) 5px var(--space-3);line-height:1.45;border-left:3px solid transparent;border-radius:0 var(--radius-sm) var(--radius-sm) 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