.ep-course-route-wrap,.ep-course-app,.ep-course-directory,.ep-course-fallback{font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;color:#0f172a;max-width:1240px;margin:auto;padding:20px;box-sizing:border-box}.ep-course-app *,.ep-course-directory *{box-sizing:border-box}.ep-course-breadcrumb{display:flex;gap:8px;flex-wrap:wrap;font-size:14px;margin-bottom:14px}.ep-course-breadcrumb a{color:#2563eb}.ep-course-hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(280px,.75fr);gap:26px;align-items:center;padding:30px;border:1px solid #dbeafe;border-radius:28px;background:linear-gradient(135deg,#f8fbff,#fff,#f0fdf4)}.ep-course-hero h1{font-size:clamp(32px,5vw,58px);line-height:1.04;margin:12px 0}.ep-course-hero p{font-size:17px;line-height:1.65;color:#475569}.ep-course-kickers,.ep-course-stats{display:flex;flex-wrap:wrap;gap:8px}.ep-course-kickers span,.ep-course-stats span,.ep-course-access-badge{padding:7px 10px;border-radius:999px;background:#fff;border:1px solid #dbeafe;font-size:13px}.ep-course-hero-image img{width:100%;max-height:330px;object-fit:contain;border-radius:22px}.ep-course-progress{display:flex;align-items:center;gap:10px;margin:18px 0}.ep-course-progress>span{height:10px;background:#e2e8f0;border-radius:99px;overflow:hidden;flex:1}.ep-course-progress i{display:block;height:100%;background:linear-gradient(90deg,#2563eb,#7c3aed)}.ep-course-start,.ep-course-actions a,.ep-course-actions button,.ep-course-lock button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 17px;border:0;border-radius:999px;background:linear-gradient(135deg,#2563eb,#7c3aed);color:#fff!important;font-weight:800;text-decoration:none;cursor:pointer}.ep-course-tabs{display:flex;gap:8px;overflow:auto;padding:14px 0;scrollbar-width:thin}.ep-course-tabs a{white-space:nowrap;padding:10px 14px;border:1px solid #dbeafe;border-radius:999px;color:#334155;text-decoration:none;font-weight:700}.ep-course-tabs a.is-active{background:#2563eb;color:#fff}.ep-course-player{display:grid;grid-template-columns:300px minmax(0,1fr);gap:22px;align-items:start}.ep-course-nav{position:sticky;top:90px;border:1px solid #dbeafe;border-radius:20px;padding:16px;background:#fff;max-height:calc(100vh - 120px);overflow:auto}.ep-course-nav details{margin:8px 0}.ep-course-nav summary{font-weight:800;cursor:pointer;padding:8px}.ep-course-nav a{display:flex;justify-content:space-between;gap:10px;padding:10px;border-radius:12px;color:#334155;text-decoration:none}.ep-course-nav a.is-current{background:#eef2ff;color:#4338ca}.ep-course-nav a.is-complete i{color:#16a34a}.ep-course-lesson,.ep-course-tab-panel{min-width:0;border:1px solid #dbeafe;border-radius:22px;padding:24px;background:#fff}.ep-course-chapter-label{color:#2563eb;font-weight:800}.ep-course-blocks{font-size:17px;line-height:1.75}.ep-course-blocks img,.ep-course-blocks video{max-width:100%;height:auto;border-radius:16px}.ep-course-blocks audio{width:100%}.ep-block-definition,.ep-block-note,.ep-course-content-block{display:block;margin:16px 0;padding:18px;border-radius:16px;background:#f8fafc;border-left:4px solid #2563eb}.ep-block-note{background:#fffbeb;border-color:#f59e0b}.ep-block-formula{overflow-x:auto;padding:18px;background:#0f172a;color:#fff;border-radius:14px;font-size:clamp(18px,3vw,28px)}.ep-course-actions{display:flex;flex-wrap:wrap;gap:9px;margin:22px 0}.ep-course-actions button,.ep-course-actions a{font-size:13px;min-height:40px}.ep-course-pager{display:flex;justify-content:space-between;gap:12px;border-top:1px solid #e2e8f0;padding-top:18px}.ep-course-pager a{color:#2563eb;font-weight:800}.ep-course-lock,.ep-course-empty{padding:22px;border-radius:18px;background:#fff7ed;border:1px solid #fed7aa}.ep-course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.ep-course-card{border:1px solid #dbeafe;border-radius:22px;overflow:hidden;background:#fff}.ep-course-card img{width:100%;aspect-ratio:16/9;object-fit:cover}.ep-course-card div{padding:18px}.ep-course-card h2{font-size:22px}.ep-course-card a{color:#2563eb;font-weight:800}.ep-course-filters{display:flex;gap:10px;margin:18px 0}.ep-course-filters input{flex:1;min-height:46px;border:1px solid #cbd5e1;border-radius:14px;padding:0 14px}.ep-course-filters button{border:0;border-radius:14px;padding:0 18px;background:#2563eb;color:#fff;font-weight:800}.ep-continue-learning{display:grid;gap:4px;padding:18px;border-radius:18px;background:linear-gradient(135deg,#2563eb,#7c3aed);color:#fff;text-decoration:none}.ep-course-mobile-drawer{display:none}
html[data-theme="dark"] .ep-course-app,body[data-ai-study-theme="dark"] .ep-course-app{color:#e5eefc}.ep-course-app[data-theme="dark"] .ep-course-hero,html[data-theme="dark"] .ep-course-hero,body[data-ai-study-theme="dark"] .ep-course-hero,html[data-theme="dark"] .ep-course-nav,body[data-ai-study-theme="dark"] .ep-course-nav,html[data-theme="dark"] .ep-course-lesson,body[data-ai-study-theme="dark"] .ep-course-lesson,html[data-theme="dark"] .ep-course-tab-panel,body[data-ai-study-theme="dark"] .ep-course-tab-panel{background:#0f1b2d;color:#e5eefc;border-color:#334155}html[data-theme="dark"] .ep-course-hero p,body[data-ai-study-theme="dark"] .ep-course-hero p{color:#cbd5e1}
@media(max-width:900px){.ep-course-hero{grid-template-columns:1fr}.ep-course-player{grid-template-columns:1fr}.ep-course-nav{position:fixed;left:12px;right:12px;bottom:12px;top:auto;z-index:999;max-height:70vh;transform:translateY(120%);transition:.2s}.ep-course-nav.is-open{transform:none}.ep-course-mobile-drawer{display:block;margin-bottom:14px}.ep-course-mobile-drawer button{width:100%;height:44px;border:1px solid #dbeafe;border-radius:12px;background:#fff}.ep-course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.ep-course-route-wrap,.ep-course-app,.ep-course-directory,.ep-course-fallback{padding:10px}.ep-course-hero,.ep-course-lesson,.ep-course-tab-panel{padding:16px;border-radius:18px}.ep-course-hero h1{font-size:32px}.ep-course-grid{grid-template-columns:1fr}.ep-course-actions>*{flex:1 1 46%;min-width:0}.ep-course-pager{flex-direction:column}.ep-course-pager a{padding:10px 0}.ep-course-tabs{margin-inline:-10px;padding-inline:10px}}

/* Course Pack activities v67.9.0 */
.ep-course-activity-list,.ep-course-quiz-list{display:grid;gap:16px}.ep-course-activity-card{border:1px solid rgba(125,125,125,.22);border-radius:14px;padding:18px;background:var(--ep-course-card,#fff);box-shadow:0 6px 20px rgba(0,0,0,.04)}.ep-course-activity-card h3{margin:8px 0 12px}.ep-course-activity-card details{margin-top:12px;border-top:1px solid rgba(125,125,125,.18);padding-top:10px}.ep-course-activity-card summary{cursor:pointer;font-weight:700}.ep-course-activity-meta{display:flex;flex-wrap:wrap;gap:8px}.ep-course-activity-meta span{font-size:12px;border-radius:999px;padding:5px 9px;background:rgba(52,105,255,.09)}
.ep-course-question-options{margin:12px 0 4px;padding-inline-start:28px}.ep-course-question-options li{margin:6px 0;padding-inline-start:4px}

/* Course SEO and Monetization v67.10.0 */
.ep-course-access-notice{margin:0 0 14px;padding:13px 16px;border:1px solid #bfdbfe;border-radius:14px;background:#eff6ff;color:#1e3a8a;font-weight:700}.ep-course-access-notice.is-success{border-color:#bbf7d0;background:#f0fdf4;color:#166534}.ep-course-access-notice.is-warning{border-color:#fde68a;background:#fffbeb;color:#92400e}.ep-course-access-notice.is-error{border-color:#fecaca;background:#fef2f2;color:#991b1b}.ep-course-credit-unlock{display:inline-flex;margin:0}.ep-course-access-cta,.ep-course-lock-cta{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 17px;border:0;border-radius:999px;background:linear-gradient(135deg,#2563eb,#7c3aed);color:#fff!important;font-weight:800;text-decoration:none;cursor:pointer}.ep-course-access-cta.is-disabled,.ep-course-lock-cta.is-disabled{background:#64748b;cursor:not-allowed}.ep-course-access-badge.is-free{border-color:#bbf7d0;background:#f0fdf4;color:#166534}.ep-course-access-badge.is-free-preview{border-color:#bae6fd;background:#f0f9ff;color:#075985}.ep-course-access-badge.is-included{border-color:#c4b5fd;background:#f5f3ff;color:#5b21b6}.ep-course-access-badge.is-credits{border-color:#fde68a;background:#fffbeb;color:#92400e}.ep-course-access-badge.is-assigned,.ep-course-access-badge.is-premium,.ep-course-access-badge.is-locked{border-color:#fecaca;background:#fef2f2;color:#991b1b}.ep-course-related-links{margin-top:24px;padding:24px;border:1px solid #dbeafe;border-radius:22px;background:#fff}.ep-course-related-links h2{margin:0 0 12px}.ep-course-related-links h2:not(:first-child){margin-top:24px}.ep-course-link-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.ep-course-link-grid a{padding:12px 14px;border:1px solid #dbeafe;border-radius:13px;color:#1d4ed8;text-decoration:none;font-weight:700}.ep-course-faqs details{border-top:1px solid #e2e8f0;padding:12px 0}.ep-course-faqs summary{cursor:pointer;font-weight:800}.ep-course-faqs p{margin:8px 0 0;line-height:1.65}.ep-activity-notice--locked{padding:18px;border:1px solid #fed7aa;border-radius:16px;background:#fff7ed}.ep-activity-notice--locked .ep-course-lock-cta,.ep-activity-notice--locked .ep-course-credit-unlock{margin-top:10px}
html[data-theme="dark"] .ep-course-related-links,body[data-ai-study-theme="dark"] .ep-course-related-links{background:#0f1b2d;color:#e5eefc;border-color:#334155}html[data-theme="dark"] .ep-course-link-grid a,body[data-ai-study-theme="dark"] .ep-course-link-grid a{border-color:#334155;color:#93c5fd}html[data-theme="dark"] .ep-course-faqs details,body[data-ai-study-theme="dark"] .ep-course-faqs details{border-color:#334155}
@media(max-width:800px){.ep-course-link-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:560px){.ep-course-link-grid{grid-template-columns:1fr}.ep-course-related-links{padding:16px}.ep-course-credit-unlock,.ep-course-access-cta,.ep-course-lock-cta{width:100%}}


/* Stable release accessibility hardening. */
:where(.ai-study-app,.ep-course-experience,.ep-course-showcase,.ep-home-course-showcase,.ep-smart-filter,.ep-quiz-player,.ep-course-module-bridge) :where(a,button,input,select,textarea,[tabindex]):focus-visible{outline:3px solid #2563eb;outline-offset:3px;box-shadow:0 0 0 2px #fff}
.screen-reader-text{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
@media (prefers-reduced-motion: reduce){html:focus-within{scroll-behavior:auto!important}:where(.ai-study-app,.ep-course-experience,.ep-course-showcase,.ep-home-course-showcase,.ep-smart-filter,.ep-quiz-player,.ep-course-module-bridge),:where(.ai-study-app,.ep-course-experience,.ep-course-showcase,.ep-home-course-showcase,.ep-smart-filter,.ep-quiz-player,.ep-course-module-bridge) *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}}


/* v1.67.37 school-course readability and return navigation */
.ep-course-return-nav{display:flex;flex-wrap:wrap;gap:10px;margin:10px 0 16px}.ep-course-return-nav a,.ep-course-back-main{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 14px;border:1px solid #bfdbfe;border-radius:999px;background:#fff;color:#1d4ed8!important;font-weight:800;text-decoration:none;box-shadow:0 4px 14px rgba(37,99,235,.08)}.ep-course-return-nav a:hover,.ep-course-back-main:hover{background:#eff6ff}.ep-course-lesson-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:12px}.ep-course-lesson-heading h2{margin-top:4px}.ep-course-back-main{flex:0 0 auto;font-size:13px}.ep-block-title{display:block;margin:0 0 10px;font-size:15px;line-height:1.35}.ep-block-body{display:block}.ep-block-body>:first-child{margin-top:0}.ep-block-body>:last-child{margin-bottom:0}.ep-course-content-block{border:1px solid #e2e8f0;border-left:4px solid #2563eb}.ep-course-content-worked_example,.ep-course-content-example{background:#f0f9ff;border-left-color:#0284c7}.ep-course-content-revision{background:#f0fdf4;border-left-color:#16a34a}.ep-course-section-heading{margin:28px 0 12px;padding-bottom:8px;border-bottom:2px solid #dbeafe}.ep-course-blocks .ep-block-note,.ep-course-blocks .ep-block-definition,.ep-course-blocks .ep-course-content-block{box-shadow:0 5px 18px rgba(15,23,42,.04)}
html[data-theme="dark"] .ep-course-return-nav a,body[data-ai-study-theme="dark"] .ep-course-return-nav a,html[data-theme="dark"] .ep-course-back-main,body[data-ai-study-theme="dark"] .ep-course-back-main{background:#0f1b2d;border-color:#334155;color:#93c5fd!important}
@media(max-width:700px){.ep-course-return-nav{display:grid;grid-template-columns:1fr 1fr}.ep-course-return-nav a{padding:0 9px;font-size:12px}.ep-course-lesson-heading{flex-direction:column}.ep-course-back-main{width:100%}.ep-course-blocks{font-size:16px;line-height:1.65}.ep-block-definition,.ep-block-note,.ep-course-content-block{padding:16px}.ep-course-content-block h3{font-size:22px;line-height:1.2}}