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0;border:none;border-radius:9999px;flex-shrink:0;justify-content:center;align-items:center;gap:.25rem;padding:.375rem .625rem;font-size:12px;font-weight:600;display:inline-flex}.ui-row-action:hover{background:var(--color-main-glow,#4f46e51f)}.ui-row-action:active{opacity:var(--motion-press-opacity,.92)}.ui-row-action--primary{background:var(--btn-primary-bg,#4f46e5e0);color:#fff}.ui-row-action--primary:hover{background:var(--btn-primary-bg-hover,#4f46e5f5)}.ui-row-action--disabled{opacity:.4;cursor:not-allowed;pointer-events:none}.ui-row-action__icon{width:1rem;height:1rem}.ui-shell-greeting{color:var(--color-text);letter-spacing:-.02em;font-size:1.125rem;font-weight:600;line-height:1.3}.ui-shell-greeting__name{color:var(--color-main)}.app-shell-bottom-nav__header--soft{border-bottom:none;padding-bottom:.75rem}@media (prefers-reduced-motion:reduce){.ui-list-row--pressable:active,.ui-row-action:active{opacity:1}}.ui-tile-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.ui-tile-card{border-radius:var(--card-radius-md,16px);min-height:96px;box-shadow:var(--card-shadow-soft,0 8px 24px #4f46e51f);color:#fff;text-align:left;cursor:pointer;transition:transform var(--motion-press-duration) ease-out, box-shadow var(--motion-press-duration) ease-out;border:none;flex-direction:column;justify-content:flex-end;align-items:flex-start;gap:.5rem;padding:1rem;display:flex}.ui-tile-card:active{transform:scale(.98)}.ui-tile-card--indigo{background:var(--card-gradient-indigo)}.ui-tile-card--accent{background:var(--card-gradient-accent)}.ui-tile-card--sky{background:var(--card-gradient-sky)}.ui-tile-card__icon{opacity:.95;width:1.5rem;height:1.5rem}.ui-tile-card__label{letter-spacing:-.01em;font-size:15px;font-weight:600}.ui-media-scroll{-webkit-overflow-scrolling:touch;scrollbar-width:none;gap:12px;padding-bottom:.25rem;display:flex;overflow-x:auto}.ui-media-scroll--snap{scroll-snap-type:x mandatory}.ui-media-scroll::-webkit-scrollbar{display:none}.ui-media-stack{flex-direction:column;gap:12px;display:flex}.ui-media-card{box-sizing:border-box;flex:0 0 var(--space-rail-width,min(100%, 260px));width:var(--space-rail-width,min(100%, 260px));height:var(--space-card-height,80px);padding:var(--space-card-pad,.75rem);border-radius:var(--space-card-radius,var(--card-radius-md,16px));background:var(--media-card-bg,#ffffffb8);box-shadow:var(--card-shadow-soft,0 8px 24px #4f46e51f);text-align:left;cursor:pointer;transition:transform var(--motion-press-duration) ease-out, box-shadow var(--motion-press-duration) ease-out;border:none;align-items:center;gap:.875rem;display:flex;overflow:hidden}.ui-media-card:active{transform:scale(.99)}.ui-media-card--static{cursor:default}.ui-media-card--compact{width:100%;min-width:0;box-shadow:none;border-bottom:1px solid var(--color-divider,#1e1b4b14);background:0 0;border-radius:0;padding:.625rem 0}.ui-media-card--compact:last-child{border-bottom:none}.ui-media-card__thumb{border-radius:14px;flex-shrink:0;width:56px;height:56px;box-shadow:inset 0 0 0 1px #ffffff40}.ui-media-card__thumb--indigo{background:var(--card-gradient-indigo)}.ui-media-card__thumb--accent{background:var(--card-gradient-accent)}.ui-media-card__thumb--sky{background:var(--card-gradient-sky)}.ui-media-card__body{flex:1;min-width:0}.ui-media-card__title{color:var(--color-text);letter-spacing:-.01em;-webkit-line-clamp:1;-webkit-box-orient:vertical;font-size:15px;font-weight:600;line-height:1.35;display:-webkit-box;overflow:hidden}.ui-media-card__meta{color:var(--color-text-muted);white-space:nowrap;text-overflow:ellipsis;margin-top:.25rem;font-size:12px;line-height:1.4;overflow:hidden}@media (prefers-reduced-motion:reduce){.ui-tile-card:active,.ui-media-card:active,.ui-today-card:active,.ui-action-tile--drill:active{transform:none}}.student-login-menu{z-index:50;flex-shrink:0;position:relative}.student-login-button{border:1px solid var(--surface-border-glass,#c7d2fe8c);background:var(--btn-ghost-bg,#ffffff73);width:44px;height:44px;color:var(--color-main);box-shadow:var(--surface-shadow-soft);-webkit-backdrop-filter:blur(var(--surface-glass-blur,12px));transition:transform var(--motion-press-duration) ease-out, opacity var(--motion-press-duration) ease-out, background var(--motion-press-duration) ease-out, box-shadow var(--motion-press-duration) ease-out;cursor:pointer;border-radius:9999px;justify-content:center;align-items:center;display:inline-flex}.student-login-button:hover{background:var(--btn-ghost-bg-hover,#ffffff9e)}.student-login-button:active{transform:translateY(var(--motion-press-translate-y,1px));opacity:var(--motion-press-opacity,.92)}.student-login-button--authenticated{background:var(--surface-active-pill,#4f46e51f);border-color:var(--surface-border-glass-strong,#4f46e538)}.student-login-button--open{box-shadow:var(--surface-shadow-soft-hover);border-color:var(--surface-border-glass-strong,#4f46e538)}.student-login-button__icon{width:22px;height:22px}.student-login-menu__catcher{z-index:40;cursor:default;background:0 0;border:none;position:fixed;inset:0}.student-login-menu__popover-wrap{z-index:51;min-width:min(320px,100vw - 2rem);max-width:min(360px,100vw - 2rem);position:absolute;top:calc(100% + 8px);right:0}.student-login-popover{max-height:min(72vh,560px);animation:student-login-popover-in var(--motion-press-duration) ease-out;transform-origin:100% 0;padding:1rem;overflow-y:auto}.student-login-popover__close{color:var(--color-text-muted);font-size:var(--text-caption-size);cursor:pointer;background:0 0;border:none;padding:.25rem .5rem}.student-login-popover__input{border-radius:var(--clay-radius-button);border:1px solid var(--surface-border-glass,#c7d2fe8c);background:var(--btn-ghost-bg,#ffffff73);min-height:44px;color:var(--color-text);font:inherit;padding:.625rem .875rem}.student-login-popover__input:focus{outline:2px solid #4f46e559}@supports (color:color-mix(in lab, red, red)){.student-login-popover__input:focus{outline:2px solid color-mix(in srgb, var(--color-main) 35%, transparent)}}.student-login-popover__input:focus{outline-offset:1px}.student-login-popover__input:disabled{opacity:.55;cursor:not-allowed}.student-login-popover__back,.student-login-popover__text-link{color:var(--color-main);font-size:var(--text-caption-size);cursor:pointer;background:0 0;border:none;padding:.25rem 0;font-weight:600}.student-login-popover__text-link{text-align:center;width:100%;display:block}.student-account-menu{flex-direction:column;gap:.375rem;display:flex}.student-account-menu__item{border-radius:var(--clay-radius-button);background:var(--btn-ghost-bg,#ffffff73);width:100%;min-height:44px;color:var(--color-text);text-align:left;cursor:pointer;border:none;justify-content:space-between;align-items:center;padding:.5rem .75rem;font-size:.9375rem;font-weight:600;display:flex}.student-account-menu__item:hover{background:var(--btn-ghost-bg-hover,#ffffff9e)}.student-account-menu__item--logout{color:var(--color-main);justify-content:center}.student-account-menu__chevron{color:var(--color-text-muted);font-size:1.25rem;line-height:1}.student-account-menu__section-title{color:var(--color-text);font-size:.875rem;font-weight:600}.student-install-steps{font-size:var(--text-caption-size);margin:0;padding-left:1.125rem;line-height:1.55}.student-pwa-install-banner{left:0;right:0;bottom:calc(4.75rem + max(env(safe-area-inset-bottom,0px), var(--safe-area-min-bottom,0px)));z-index:48;pointer-events:none;padding:0 1rem .75rem;position:fixed}.student-pwa-install-banner__card{pointer-events:auto;padding:1rem 1.125rem}.student-pwa-install-banner__title{color:var(--color-text);margin:0;font-size:.95rem;font-weight:650}.student-pwa-install-banner__body,.student-pwa-install-banner__hint{font-size:var(--text-caption-size);color:var(--color-text-muted);margin:.35rem 0 0;line-height:1.45}.student-pwa-install-banner__actions{gap:.5rem;margin-top:.85rem;display:flex}.student-pwa-install-banner__actions .clay-button{flex:1}.clay-button:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}@keyframes student-login-popover-in{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.app-shell-bottom-nav__header,.app-shell-bottom-nav__header-inner{overflow:visible}@media (prefers-reduced-motion:reduce){.student-login-button:active{opacity:1;transform:none}.student-login-popover{animation:none}}.lecture-badge{border-radius:9999px;align-items:center;gap:.25rem;padding:.125rem .5rem;font-size:12px;font-weight:600;display:inline-flex}.lecture-badge--subject{background:var(--surface-badge-bg,#818cf826);color:var(--color-main)}.lecture-badge--shared{background:var(--surface-active-pill,#4f46e51f);color:var(--color-main)}.lecture-badge--locked{color:var(--color-text-muted);background:0 0}.lecture-course-block__videos{margin-top:.25rem}.app-shell-bottom-nav[data-watch-mode=true] .app-shell-bottom-nav__header,.app-shell-bottom-nav[data-watch-mode=true] .app-shell-bottom-nav__nav{display:none}.app-shell-bottom-nav[data-watch-mode=true] .app-shell-bottom-nav__main{padding:0;scroll-padding-bottom:0;overflow:hidden}.app-shell-bottom-nav[data-watch-mode=true] .app-shell-bottom-nav__main.device-content-column{max-width:none;padding-inline:0}.lecture-watch{background:var(--color-bg,#f8f7ff);flex-direction:column;height:100%;min-height:100%;display:flex}.lecture-watch__player{z-index:2;aspect-ratio:16/9;background:#000;flex-shrink:0;width:100%;position:relative}.lecture-watch__video{object-fit:contain;background:#000;width:100%;height:100%;display:block}.lecture-watch__player--inapp-fs{z-index:70;aspect-ratio:auto;background:#000;width:100%;height:100svh;position:fixed;inset:0}.lecture-watch__player--inapp-fs .lecture-watch__video{width:100%;height:100%}.lecture-watch__player--inapp-fs.lecture-watch__player--portrait .lecture-watch__video{object-fit:contain}.lecture-watch__player--inapp-fs.lecture-watch__player--landscape .lecture-watch__video{object-fit:cover}.lecture-watch__scroll{-webkit-overflow-scrolling:touch;flex:auto;min-height:0;padding:1rem 1rem 2rem;overflow-y:auto}.lecture-watch__toolbar{align-items:center;margin-bottom:.75rem;display:flex}.lecture-watch__back{flex-shrink:0}.lecture-watch__title{letter-spacing:-.02em;color:var(--color-text);font-size:1.125rem;font-weight:700;line-height:1.35}.lecture-watch__meta{color:var(--color-text-muted);margin-top:.375rem;font-size:13px;line-height:1.45}.lecture-watch__section{border-top:1px solid var(--color-divider,#1e1b4b14);margin-top:1.5rem;padding-top:1.25rem}.lecture-watch__section-title{color:var(--color-text);font-size:15px;font-weight:600}.lecture-watch__placeholder{color:var(--color-text-muted);margin-top:.5rem;font-size:13px;line-height:1.5}.lecture-video-card{border-radius:var(--card-radius-md,16px);background:var(--media-card-bg,#ffffffb8);box-shadow:var(--card-shadow-soft,0 8px 24px #4f46e51f)}.lecture-video-card__main{cursor:pointer;align-items:center;gap:.75rem;width:100%;padding:.875rem 1rem;display:flex}.lecture-video-card__main--disabled{cursor:default}.lecture-video-card__body{flex-direction:column;flex:1;min-width:0;display:flex}.lecture-video-card__play{margin-left:auto}.lecture-video-card__title{color:var(--color-text);letter-spacing:-.01em;font-size:15px;font-weight:600;line-height:1.35}.lecture-video-card__meta-row{flex-wrap:wrap;align-items:center;gap:.5rem;margin-top:.375rem;display:flex}.lecture-video-card__meta{color:var(--color-text-muted);font-size:12px;line-height:1.4}:root{--ios-tab-bar-height:56px}.ios-tab-bar-dock{justify-content:center;width:100%;display:flex}.ios-tab-bar{width:fit-content;max-width:min(var(--nav-dock-max-width,360px), calc(100vw - 2rem));background:var(--nav-glass-bg,#ffffff57);border:.5px solid var(--nav-glass-border,#ffffff73);box-shadow:var(--nav-glass-shadow,0 2px 12px #1e1b4b0f);-webkit-backdrop-filter:blur(var(--nav-glass-blur,22px)) saturate(1.35);border-radius:9999px;padding:4px 6px}.ios-tab-bar__list{justify-content:center;align-items:stretch;gap:2px;margin:0;padding:0;list-style:none;display:flex}.ios-tab-bar__item-wrap{flex:none}.ios-tab-bar__item{min-width:56px;min-height:var(--device-touch-target-min,44px);color:var(--color-text-muted);cursor:pointer;transition:color var(--motion-press-duration) ease-out, opacity var(--motion-press-duration) ease-out, transform var(--motion-press-duration) ease-out;background:0 0;border:none;border-radius:9999px;flex-direction:column;justify-content:center;align-items:center;gap:2px;padding:4px 8px 3px;display:flex}.ios-tab-bar__item:active{opacity:var(--motion-press-opacity,.92);transform:scale(.96)}.ios-tab-bar__item--active{color:var(--color-main)}.ios-tab-bar__icon{flex-shrink:0;width:24px;height:24px}.ios-tab-bar__label{text-overflow:ellipsis;white-space:nowrap;letter-spacing:-.01em;max-width:4.5rem;font-size:10px;font-weight:500;line-height:1.1;overflow:hidden}.ios-tab-bar__item--active .ios-tab-bar__label{font-weight:600}@supports not ((-webkit-backdrop-filter:blur(1px)) or (backdrop-filter:blur(1px))){.ios-tab-bar{-webkit-backdrop-filter:none;background:#ffffffeb}}@media (prefers-reduced-motion:reduce){.ios-tab-bar__item:active{opacity:1;transform:none}}:root{--safe-area-min-top:12px;--safe-area-min-bottom:16px;--safe-area-min-horizontal:12px;--app-nav-bottom-gap:4px}.app-inset-top{padding-top:max(env(safe-area-inset-top,0px), var(--safe-area-min-top,0px))}.app-inset-bottom{padding-bottom:max(env(safe-area-inset-bottom,0px), var(--safe-area-min-bottom,0px))}.app-inset-x{padding-left:max(env(safe-area-inset-left,0px), var(--safe-area-min-horizontal,0px));padding-right:max(env(safe-area-inset-right,0px), var(--safe-area-min-horizontal,0px))}.app-shell-mobile{min-height:100svh}.app-shell-mobile__nav{padding-bottom:calc(max(env(safe-area-inset-bottom,0px), var(--safe-area-min-bottom,0px)) + var(--app-nav-bottom-gap,0px))}.app-shell-bottom-nav__header{padding-top:max(env(safe-area-inset-top,0px), var(--safe-area-min-top,0px))}.app-shell-bottom-nav__header-inner{max-width:var(--device-content-max-width,100%);width:100%;margin-inline:auto}.app-shell-bottom-nav--fixed-nav{height:100svh;min-height:100dvh;overflow:hidden}.app-shell-bottom-nav__main{-webkit-overflow-scrolling:touch;overscroll-behavior-y:contain;min-height:0;scroll-padding-bottom:calc(var(--ios-tab-bar-height,56px) + max(env(safe-area-inset-bottom,0px), var(--safe-area-min-bottom,0px)) + var(--app-nav-bottom-gap,0px));flex:auto;overflow-y:auto}.app-shell-bottom-nav__main:has(.ui-main-center){padding-bottom:calc(var(--ios-tab-bar-height,56px) + max(env(safe-area-inset-bottom,0px), var(--safe-area-min-bottom,0px)) + var(--app-nav-bottom-gap,0px));flex-direction:column;justify-content:center;display:flex}.app-shell-bottom-nav__nav--dock{z-index:50;pointer-events:none;padding-top:.25rem;padding-bottom:calc(max(env(safe-area-inset-bottom,0px), var(--safe-area-min-bottom,0px)) + var(--app-nav-bottom-gap,0px));background:0 0;position:fixed;bottom:0;left:0;right:0}.app-shell-bottom-nav__nav--dock .ios-tab-bar-dock{pointer-events:auto}.app-shell-mobile__header{padding-top:max(env(safe-area-inset-top,0px), var(--safe-area-min-top,0px))}:root{--device-profile:mobile;--device-content-max-width:100%;--device-page-padding:16px;--device-touch-target-min:44px}[data-device-profile=mobile],[data-device-profile=tablet],[data-device-profile=desktop]{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light only}.device-content-column{width:100%;max-width:var(--device-content-max-width);padding-inline:calc(var(--device-page-padding) * var(--tone-spacing-scale,1));margin-inline:auto}.device-touch-target{min-height:var(--device-touch-target-min);min-width:var(--device-touch-target-min)}@keyframes splash-progress{0%{transform:translate(-100%)}to{transform:translate(250%)}}@keyframes splash-fade-out{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-8px)}}.splash-screen{--splash-bg:var(--color-bg,#eef2ff);--splash-glow:var(--color-main-glow,#4f46e51f);--splash-primary:var(--color-main,#4f46e5);--splash-secondary:var(--color-secondary,#818cf8);--splash-title-color:var(--color-main,#4f46e5);--splash-subtitle-color:var(--color-text-muted,#6366a0);--splash-body-color:var(--color-text,#1e1b4b);--splash-logo-size:80px;--splash-title-size:28px;--splash-subtitle-size:14px;--splash-fade-ms:.4s;z-index:9999;background:radial-gradient(circle at 50% 35%, #fff 0%, var(--splash-bg) 55%, var(--splash-primary) 100%);flex-direction:column;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}@supports (color:color-mix(in lab, red, red)){.splash-screen{background:radial-gradient(circle at 50% 35%, #fff 0%, var(--splash-bg) 55%, color-mix(in srgb, var(--splash-primary) 8%, var(--splash-bg)) 100%)}}.splash-screen{color:var(--splash-body-color);padding-top:max(env(safe-area-inset-top,0px), var(--safe-area-min-top,12px));padding-right:max(env(safe-area-inset-right,0px), var(--safe-area-min-horizontal,12px));padding-bottom:max(env(safe-area-inset-bottom,0px), var(--safe-area-min-bottom,16px));padding-left:max(env(safe-area-inset-left,0px), var(--safe-area-min-horizontal,12px))}.splash-screen:before{content:"";background:radial-gradient(circle at 50% 30%, var(--splash-glow) 0%, transparent 60%);pointer-events:none;position:absolute;inset:0}.splash-screen--fading{animation:splash-fade-out var(--splash-fade-ms) ease-out forwards}@media (prefers-reduced-motion:reduce){.splash-screen--fading{opacity:0;animation:none}.splash-progress-bar__fill{animation:none!important}}.splash-screen__content{z-index:1;text-align:center;flex-direction:column;align-items:center;gap:1rem;display:flex;position:relative}.splash-screen__logo-wrap{width:var(--splash-logo-size);height:var(--splash-logo-size);border-radius:calc(var(--clay-radius-card,20px) + 8px);background:var(--color-surface,#fff);border:1px solid var(--color-border,#c7d2fe);box-shadow:var(--surface-shadow-soft,0 4px 20px #4f46e514);-webkit-backdrop-filter:blur(var(--surface-glass-blur,12px));overflow:hidden}.splash-screen__logo{object-fit:cover;width:100%;height:100%}.splash-screen__title{font-size:var(--splash-title-size);font-weight:var(--text-title-weight,700);letter-spacing:-.02em;color:var(--splash-title-color)}.splash-screen__brand-sub{font-size:calc(var(--splash-title-size) * .72);color:var(--splash-body-color);margin-top:-.35rem;font-weight:600}.splash-screen__subtitle{font-size:var(--splash-subtitle-size);color:var(--splash-subtitle-color)}.splash-screen__progress{bottom:calc(2.5rem + max(env(safe-area-inset-bottom,0px), var(--safe-area-min-bottom,16px)));background:var(--splash-primary);border-radius:9999px;width:min(180px,42vw);height:4px;position:absolute;left:50%;transform:translate(-50%)}@supports (color:color-mix(in lab, red, red)){.splash-screen__progress{background:color-mix(in srgb, var(--splash-primary) 12%, #fff)}}.splash-screen__progress{border:1px solid var(--color-border,#c7d2fe);overflow:hidden}.splash-progress-bar__fill{border-radius:inherit;background:linear-gradient(90deg, transparent, var(--splash-secondary), var(--splash-primary), transparent);width:40%;height:100%;animation:1.2s ease-in-out infinite splash-progress;display:block}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}