:root{--color-header-bg: #ffffff;--color-header-topbar: hsl(var(--brand-blue, 220 80% 24%));--color-header-nav: hsl(var(--brand-grey, 0 8% 95%));--color-education-blue: hsl(var(--brand-blue, 220 80% 24%));--color-education-gray: #64748b;--color-border: #e5e7eb;--color-text: hsl(var(--brand-blue, 220 80% 24%));--color-text-muted: #64748b;--shadow-sm: 0 1px 2px rgba(0,0,0,.06);--radius: 8px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--container-max: 80rem}.bg-header-bg{background-color:var(--color-header-bg)}.bg-header-topbar{background-color:var(--color-header-topbar)}.bg-header-nav{background-color:var(--color-header-nav)}.border-border{border-color:var(--color-border)}.text-education-blue{color:var(--color-education-blue)}.text-education-gray{color:var(--color-education-gray)}.shadow-sm{box-shadow:var(--shadow-sm)}.header-container{width:100%}.header-inner{max-width:var(--container-max);margin-left:auto;margin-right:auto;padding-left:1rem;padding-right:1rem}@media (min-width: 640px){.header-inner{padding-left:1.5rem;padding-right:1.5rem}}@media (min-width: 1024px){.header-inner{padding-left:2rem;padding-right:2rem}}.header-topbar{color:#fff;padding-top:10px;padding-bottom:10px}.header-topbar-row{display:flex;align-items:center;justify-content:flex-end;height:48px;width:100%;gap:var(--space-4)}.icon-3{width:.75rem;height:.75rem}.btn{display:inline-flex;align-items:center;justify-content:center;height:1.5rem;padding:0 var(--space-2);border-radius:6px;border:none;background:transparent;color:inherit;font:inherit;cursor:pointer;transition:background-color .15s ease}.btn-ghost{background:transparent;color:inherit}.btn-ghost:hover{background-color:#ffffff1a}.light-surface .btn-ghost:hover{background-color:#0f172a0f}.header-main{border-bottom:1px solid var(--color-border);background-color:var(--color-header-bg)}.header-main-row{display:flex;align-items:center;justify-content:space-between;height:170px;width:100%}.logo-link{display:flex;align-items:center;gap:.5rem;flex-shrink:0;text-decoration:none}.logo-image{height:5rem;width:auto;min-width:8rem;max-width:30rem;object-fit:contain}.logo-title{display:flex;flex-direction:column}.logo-name{font-size:1.125rem;font-weight:700;color:var(--color-education-blue);line-height:1.2}.logo-sub{font-size:.75rem;line-height:1;color:var(--color-education-gray)}.header-search{flex:1 1 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.25rem;text-decoration:none;font-size:1rem;font-weight:500;color:var(--color-education-gray);border-bottom:2px solid transparent;transition:color .2s ease,border-color .2s ease}.nav-link:hover{color:var(--color-education-blue);border-bottom-color:var(--color-education-blue)}.topbar-greeting{display:flex;align-items:center;gap:.25rem;padding:0 var(--space-1)}.topbar-greeting .name{font-size:.75rem;font-weight:600;color:#fff}.btn .icon-left{margin-right:.25rem}.dark-surface{background:var(--color-header-topbar)}.light-surface{background:var(--color-header-bg)}.header-sticky{position:sticky;top:0;z-index:50;box-shadow:var(--shadow-sm)}@media (max-width: 640px){.header-main-row{gap:.75rem}.header-search{max-width:100%;margin:0 .75rem}.main-nav{gap:.75rem;overflow-x:auto}.logo-image{min-width:6rem}}.header-topbar a,.header-topbar button{color:#fff;text-decoration:none}.header-topbar a:hover,.header-topbar button:hover{color:#fff}.header-topbar .btn.btn-ghost:hover{background-color:#ffffff1a}.header-topbar .icon-3{color:#fff}.lesson-list-title{font-size:1.875rem;font-weight:700;margin-bottom:2rem;color:hsl(var(--foreground))}.lesson-list-loading{display:flex;justify-content:center;align-items:center;min-height:16rem}.lesson-list-loading-text{font-size:1.125rem;color:hsl(var(--foreground))}.lesson-list-error{background:#fff0f0;border:1px solid hsl(0 84.2% 60.2%);color:#ba1c1c;padding:1rem;border-radius:.375rem}.lesson-list-grid{display:grid;gap:1.5rem;grid-template-columns:repeat(2,1fr)}.lesson-list-card{background:hsl(var(--card));border-radius:.5rem;box-shadow:0 1px 3px #0000001a,0 1px 2px #0000000f;padding:1.5rem;transition:box-shadow .2s}.lesson-list-card:hover{box-shadow:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d}.lesson-list-card-title{font-size:1.25rem;font-weight:600;margin-bottom:.5rem;color:hsl(var(--foreground))}.lesson-list-card-description{color:hsl(var(--muted-foreground));margin-bottom:1rem}.lesson-list-card-footer{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.lesson-list-card-price{font-size:1.5rem;font-weight:700;color:hsl(var(--education-blue))}.lesson-list-card-sections{font-size:.875rem;color:hsl(var(--muted-foreground))}.lesson-list-card-button{display:block;width:100%;background:hsl(var(--education-blue));color:hsl(var(--primary-foreground));text-align:center;padding:.5rem 1rem;border-radius:.375rem;text-decoration:none;transition:background-color .2s;font-weight:500;border:none;cursor:pointer}.lesson-list-card-button:hover{background:#08255e}.lesson-list-purchase-button{background:#21c45d}.lesson-list-purchase-button:hover{background:#1a9948}@media (min-width: 1024px){.lesson-list-grid{grid-template-columns:repeat(3,1fr)}.lesson-list-title{font-size:2rem}}@media (max-width: 767px){.lesson-list-grid{grid-template-columns:1fr}.lesson-list-title{font-size:1.5rem;margin-bottom:1.5rem}.lesson-list-card{padding:1.25rem}.lesson-list-card-title{font-size:1.125rem}.lesson-list-card-price{font-size:1.25rem}}.avatar-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:9999;display:flex;align-items:center;justify-content:center;cursor:pointer;animation:avatar-overlay-fade-in .3s ease-in}@keyframes avatar-overlay-fade-in{0%{opacity:0}to{opacity:1}}.avatar-backdrop{position:absolute;top:0;left:0;width:100%;height:100%;background:#000000b3;pointer-events:none}.avatar-container{position:relative;display:flex;flex-direction:row-reverse;align-items:flex-start;gap:0;max-width:800px;padding:32px;z-index:10000;pointer-events:none}.avatar-dialogue-wrapper{flex:1;display:flex;flex-direction:column;z-index:2}.avatar-dialogue-box{background-image:url(/dialogue-bubble.png);background-size:100% 100%;background-repeat:no-repeat;background-position:center;padding:40px 55px 120px 45px;min-height:280px;max-height:350px;width:400px;position:relative;animation:avatar-dialogue-slide-up .4s ease-out}@keyframes avatar-dialogue-slide-up{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.avatar-dialogue-content{width:100%;height:100%;overflow:hidden;position:relative}.avatar-welcome-scroll-container{position:relative;height:200px;overflow:hidden;mask-image:linear-gradient(to bottom,transparent 0%,black 15%,black 85%,transparent 100%);-webkit-mask-image:linear-gradient(to bottom,transparent 0%,black 15%,black 85%,transparent 100%)}.avatar-welcome-scroll-text{animation:avatar-scroll-up 35s linear forwards;padding-top:0;padding-bottom:50px}@keyframes avatar-scroll-up{0%{transform:translateY(0)}to{transform:translateY(calc(-100% + 200px))}}.avatar-welcome-paragraph{font-size:1.5em;font-weight:700;line-height:1.8;color:hsl(var(--brand-teal));margin:0 0 1.5em;text-align:left}.avatar-feedback-text{font-size:1.5em;font-weight:700;line-height:1.7;color:hsl(var(--brand-teal));margin:0;text-align:left}.avatar-video-container{flex-shrink:0;width:400px;height:400px;display:flex;align-items:center;justify-content:center;animation:avatar-bounce .6s cubic-bezier(.68,-.55,.265,1.55);margin-top:100px;margin-right:-40px;z-index:1}@keyframes avatar-bounce{0%{transform:scale(0)}50%{transform:scale(1.1)}to{transform:scale(1)}}.avatar-video{width:100%;height:100%;object-fit:cover}.avatar-loading{display:flex;align-items:center;justify-content:center}.avatar-loading-spinner{width:50px;height:50px;border:5px solid hsl(var(--brand-teal) / .3);border-top-color:hsl(var(--brand-teal));border-radius:50%;animation:avatar-spin 1s linear infinite}@keyframes avatar-spin{to{transform:rotate(360deg)}}.avatar-click-hint{position:fixed;bottom:40px;left:50%;transform:translate(-50%);color:#fffc;font-size:.95em;z-index:10001;animation:avatar-hint-pulse 2s ease-in-out infinite;pointer-events:none}@keyframes avatar-hint-pulse{0%,to{opacity:.6}50%{opacity:1}}@media (max-width: 768px){.avatar-container{flex-direction:column;align-items:center;max-width:90%;padding:20px}.avatar-dialogue-box{background-image:none;background:#fff;border-radius:20px;padding:24px 28px;box-shadow:0 8px 24px #0003;min-height:200px;max-height:300px;width:100%}.avatar-welcome-scroll-container{height:160px}.avatar-welcome-paragraph{font-size:.95em}.avatar-feedback-text{font-size:1em}.avatar-video-container{width:160px;height:160px;margin-top:20px;margin-left:0;margin-right:0}.avatar-click-hint{bottom:20px;font-size:.85em}}.breadcrumb-container{width:100%;background-color:transparent;padding:12px 0}.breadcrumb-inner{max-width:80rem;margin-left:auto;margin-right:auto;padding-left:1rem;padding-right:1rem}@media (min-width: 640px){.breadcrumb-inner{padding-left:1.5rem;padding-right:1.5rem}}@media (min-width: 1024px){.breadcrumb-inner{padding-left:2rem;padding-right:2rem}}.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;list-style:none;margin:0;padding:0;gap:0}.breadcrumb-item{display:flex;align-items:center;font-size:.875rem;line-height:1.25rem}.breadcrumb-link{color:#0c2f6d;text-decoration:none;transition:color .15s 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.fm-items{opacity:1;transform:translateY(0);pointer-events:auto}.burger{display:inline-block;width:22px;height:18px;position:relative}.burger .line{position:absolute;left:0;right:0;height:2px;background:#fff;transition:transform .25s ease,opacity .2s ease}.burger .line:nth-child(1){top:0}.burger .line:nth-child(2){top:8px}.burger .line:nth-child(3){top:16px}.floating-menu.open .burger .line:nth-child(1){transform:translateY(8px) rotate(45deg)}.floating-menu.open .burger .line:nth-child(2){opacity:0}.floating-menu.open .burger .line:nth-child(3){transform:translateY(-8px) rotate(-45deg)}.fm-item{border:none;display:block;width:100%;text-align:center;padding:.5rem .6rem;background:hsl(var(--brand-grey));border-radius:0;font-weight:700;color:hsl(var(--brand-blue));font-size:1rem;text-decoration:none}.fm-item:hover{background:#e8e3e3}.fm-item.active{background:hsl(var(--brand-teal));color:hsl(var(--brand-blue));position:relative}.fm-item.active:before{display:none}.fm-item.active:hover{background:hsl(var(--brand-teal))}@media (min-width: 901px){.floating-menu{display:none}}@media (max-width:640px){.floating-menu{left:12px;bottom:12px}.fm-toggle{width:48px;height:48px;font-size:18px}.fm-item{padding:7px 10px}}.left-menu{position:fixed;left:20px;top:70%;transform:translateY(-50%);width:8rem;background:transparent;padding:0;z-index:1200}.left-menu nav{display:flex;flex-direction:column;gap:1px}.left-menu-item{display:block;padding:.2rem .6rem;color:hsl(var(--brand-blue, 220 80% 24%));text-decoration:none;border-radius:0;background:hsl(var(--brand-grey, 0 8% 95%));font-weight:700;text-align:center;font-size:1rem}.left-menu-item:hover{background:#e8e3e3}.left-menu-item.active{background:hsl(var(--brand-teal, 178 54% 48%));color:hsl(var(--brand-blue, 220 80% 24%));position:relative}@media (max-width: 900px){.left-menu{display:none}}.app-footer{text-align:center;padding:18px;background:hsl(var(--brand-blue));color:#fff;border-top:1px solid #eef2ff}.app-footer p{margin:0;font-size:13px}