:root{--bg: var(--tg-theme-bg-color, #ffffff);--text: var(--tg-theme-text-color, #17181a);--hint: var(--tg-theme-hint-color, #707579);--link: var(--tg-theme-link-color, #2f6fed);--button: var(--tg-theme-button-color, #2f6fed);--button-text: var(--tg-theme-button-text-color, #ffffff);--secondary-bg: var(--tg-theme-secondary-bg-color, #f4f4f6);--success: #17875a;--success-tint: rgba(23, 135, 90, .12);--danger: #d1433f;--danger-tint: rgba(209, 67, 63, .1);--hairline: color-mix(in srgb, var(--text) 10%, transparent);--hairline-soft: color-mix(in srgb, var(--text) 6%, transparent);--card-shadow: 0 1px 2px color-mix(in srgb, var(--text) 6%, transparent);--radius-sm: 10px;--radius: 14px;--tg-safe-top: 0px;--tg-safe-bottom: 0px;--safe-top: max(var(--tg-safe-top), env(safe-area-inset-top, 0px));--safe-bottom: max(var(--tg-safe-bottom), env(safe-area-inset-bottom, 0px))}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:15.5px;line-height:1.5;-webkit-font-smoothing:antialiased}a{color:var(--link)}h1{font-size:1.3rem;font-weight:700;letter-spacing:-.01em;margin:2px 0 16px;text-wrap:balance}h2{font-size:1.05rem;font-weight:600;margin:0 0 4px}h3{font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--hint);margin:22px 0 10px}h3:first-child{margin-top:0}p{margin:0 0 10px}.screen-padded{padding:calc(16px + var(--safe-top)) 16px calc(56px + var(--safe-bottom));max-width:640px;margin:0 auto}.screen-center{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:calc(16px + var(--safe-top)) 16px calc(16px + var(--safe-bottom))}.muted{color:var(--hint)}.error{color:var(--danger);background:var(--danger-tint);border-radius:var(--radius-sm);padding:10px 13px;font-size:.9rem}.back-link{display:inline-flex;align-items:center;margin-bottom:14px;font-size:.88rem;text-decoration:none;color:var(--hint);font-weight:500}.stack{display:flex;flex-direction:column;gap:10px;margin:0 0 16px}.card{background:var(--secondary-bg);border:1px solid var(--hairline-soft);border-radius:var(--radius);padding:16px;margin:0 0 16px}.card:last-child{margin-bottom:0}.button{display:inline-flex;align-items:center;justify-content:center;gap:6px;width:100%;background:var(--button);color:var(--button-text);border:none;border-radius:var(--radius-sm);padding:13px 18px;font:inherit;font-size:.98rem;font-weight:600;text-decoration:none;text-align:center;cursor:pointer;transition:opacity .12s ease,transform .05s ease}.button:active{transform:scale(.98);opacity:.9}.button:disabled{opacity:.5;cursor:default;transform:none}.badge{display:inline-flex;align-items:center;gap:4px;padding:5px 12px;border-radius:999px;background:var(--hairline-soft);color:var(--hint);font-size:.82rem;font-weight:600}.badge-success{background:var(--success-tint);color:var(--success)}.badge-danger{background:var(--danger-tint);color:var(--danger)}.course-card h2{margin-bottom:6px}.course-card .muted{margin-bottom:14px}.course-card .button,.course-card .badge{margin-top:2px}.module-block{margin-bottom:22px}.lesson-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:var(--radius-sm);background:var(--secondary-bg);border:1px solid var(--hairline-soft);text-decoration:none;color:var(--text);margin-bottom:8px}.lesson-row:last-child{margin-bottom:0}.lesson-row.locked{opacity:.5}.lesson-order{flex-shrink:0;width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.78rem;font-weight:700;background:var(--hairline);color:var(--hint)}.lesson-row.completed .lesson-order{background:var(--success-tint);color:var(--success)}.lesson-row.in_progress .lesson-order{background:color-mix(in srgb,var(--link) 16%,transparent);color:var(--link)}.lesson-title{flex:1;min-width:0;font-size:.95rem;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lesson-chevron{flex-shrink:0;color:var(--hint);font-size:.85rem}.lesson-content{white-space:pre-wrap;font-size:.98rem;line-height:1.65;margin:0 0 20px}.material-list{display:flex;flex-direction:column;gap:8px;margin:0 0 8px}.material-link{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);background:var(--secondary-bg);border:1px solid var(--hairline-soft);border-radius:var(--radius-sm);padding:11px 13px;font-size:.9rem;font-weight:500}.material-icon{flex-shrink:0;width:30px;height:30px;border-radius:8px;background:var(--hairline);display:flex;align-items:center;justify-content:center;font-size:.95rem}.video-wrap{position:relative;width:100%;aspect-ratio:16 / 9;background:#000;border-radius:var(--radius);overflow:hidden;margin:0 0 20px;box-shadow:var(--card-shadow)}.video-wrap iframe,.video-wrap>div{width:100%;height:100%}.video-loading{position:absolute;top:0;right:0;bottom:0;left:0;z-index:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:#ffffffd9;font-size:.86rem;font-weight:500;background:#000}.video-spinner{width:26px;height:26px;border-radius:50%;border:3px solid rgba(255,255,255,.25);border-top-color:#fff;animation:video-spin .8s linear infinite}@keyframes video-spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion: reduce){.video-spinner{animation:none}}form label{display:flex;flex-direction:column;gap:6px;margin-bottom:12px;font-size:.85rem;font-weight:500;color:var(--hint)}form label:last-of-type{margin-bottom:0}input,textarea{font:inherit;font-size:.95rem;padding:11px 13px;border-radius:var(--radius-sm);border:1px solid var(--hairline);background:var(--bg);color:var(--text)}input:focus,textarea:focus{outline:none;border-color:var(--link)}input::placeholder,textarea::placeholder{color:var(--hint);opacity:.7}textarea{font-family:inherit;resize:vertical}input[type=file]{padding:10px 13px;font-size:.86rem}input[type=file]::file-selector-button{border:none;background:var(--hairline);color:var(--text);padding:7px 12px;border-radius:7px;font:inherit;font-size:.85rem;font-weight:600;margin-right:10px;cursor:pointer}.homework-card{border-color:color-mix(in srgb,var(--link) 22%,var(--hairline-soft))}.accent-card{background:color-mix(in srgb,var(--link) 8%,var(--secondary-bg));border-color:color-mix(in srgb,var(--link) 25%,var(--hairline-soft))}:root{--course-blue-a: #6fa8f5;--course-blue-b: #2f6fed;--course-blue-shadow: rgba(47, 111, 237, .28);--course-on-blue: #ffffff;--course-on-blue-muted: rgba(255, 255, 255, .78);--course-badge-bg: #fde047;--course-badge-text: #4a3b06;--course-locked-a: #c9d5e8;--course-locked-b: #aebedc;--course-locked-text: #5b6b85;--course-green-a: #4ade80;--course-green-b: #16a34a}.course-hero{position:relative;overflow:hidden;border-radius:22px;padding:22px 20px;margin:0 0 20px;background:linear-gradient(135deg,var(--course-blue-a) 0%,var(--course-blue-b) 100%);box-shadow:0 10px 24px -12px var(--course-blue-shadow);color:var(--course-on-blue);display:flex;align-items:center;gap:16px}.course-hero-text{flex:1;min-width:0;position:relative;z-index:1}.course-hero-eyebrow{display:inline-flex;align-items:center;padding:4px 11px;border-radius:999px;background:var(--course-badge-bg);color:var(--course-badge-text);font-size:.72rem;font-weight:700;letter-spacing:.02em;margin-bottom:10px}.course-hero h1{color:var(--course-on-blue);margin:0 0 4px}.course-hero-desc{color:var(--course-on-blue-muted);font-size:.86rem;margin:0}.course-hero-photo{flex-shrink:0;width:88px;height:88px;border-radius:18px;object-fit:cover;position:relative;z-index:1;box-shadow:0 6px 16px -6px #00000059}.course-hero-sparkle{position:absolute;color:#ffffff8c;pointer-events:none}.progress-line{display:flex;align-items:center;gap:10px;margin:0 0 18px}.progress-track{flex:1;height:7px;border-radius:999px;background:var(--hairline);overflow:hidden}.progress-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--course-blue-a) 0%,var(--course-blue-b) 100%);transition:width .3s ease}.progress-label{flex-shrink:0;font-size:.78rem;font-weight:600;color:var(--hint)}.module-locked-hint{display:flex;align-items:center;gap:8px;padding:11px 13px;border-radius:var(--radius-sm);background:var(--hairline-soft);color:var(--hint);font-size:.85rem;margin:0 0 16px}.badge-tag{display:inline-flex;align-items:center;flex-shrink:0;padding:3px 10px;border-radius:999px;background:var(--course-badge-bg);color:var(--course-badge-text);font-size:.68rem;font-weight:700;letter-spacing:.01em;width:fit-content}.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(148px,1fr));gap:12px;margin:0 0 18px}.module-card{display:flex;flex-direction:column;justify-content:space-between;gap:14px;min-height:132px;padding:15px 15px 13px;border-radius:18px;background:linear-gradient(135deg,var(--course-blue-a) 0%,var(--course-blue-b) 100%);box-shadow:0 8px 18px -10px var(--course-blue-shadow);text-decoration:none;color:var(--course-on-blue);transition:transform .08s ease}.module-card:active{transform:scale(.98)}.module-card-bottom{display:flex;align-items:flex-end;justify-content:space-between;gap:8px}.module-card-title{flex:1;min-width:0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;text-overflow:ellipsis;font-size:.95rem;font-weight:700;line-height:1.25}.module-card-icon{flex-shrink:0;font-size:1.5rem;line-height:1}.module-card.locked{background:linear-gradient(135deg,var(--course-locked-a) 0%,var(--course-locked-b) 100%);color:var(--course-locked-text);box-shadow:none}.module-card.locked .badge-tag{background:#ffffff8c;color:var(--course-locked-text)}.lesson-list{display:flex;flex-direction:column;gap:10px;margin:0 0 16px}.lesson-card{display:flex;align-items:center;gap:12px;padding:13px 14px;border-radius:16px;background:linear-gradient(135deg,var(--course-blue-a) 0%,var(--course-blue-b) 100%);box-shadow:0 6px 14px -10px var(--course-blue-shadow);text-decoration:none;color:var(--course-on-blue)}.lesson-card.locked{background:linear-gradient(135deg,var(--course-locked-a) 0%,var(--course-locked-b) 100%);color:var(--course-locked-text);box-shadow:none}.lesson-card-badge{display:block;font-size:.68rem;font-weight:700;color:var(--course-on-blue-muted);margin-bottom:3px}.lesson-card.locked .lesson-card-badge{color:var(--course-locked-text);opacity:.75}.lesson-card-body{flex:1;min-width:0}.lesson-card-title{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-overflow:ellipsis;font-size:.94rem;font-weight:600;line-height:1.3}.lesson-card-arrow{flex-shrink:0;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.95rem;font-weight:700;background:var(--course-badge-bg);color:var(--course-badge-text)}.lesson-card-arrow.done{background:var(--course-green-a);color:#0a3d1f}.lesson-card-arrow.locked{background:#ffffff80;color:var(--course-locked-text)}.course-list-card{display:flex;flex-direction:column;gap:14px;padding:22px;border-radius:24px;margin:0 0 16px;background:linear-gradient(135deg,var(--course-blue-a) 0%,var(--course-blue-b) 100%);box-shadow:0 8px 20px -12px var(--course-blue-shadow);color:var(--course-on-blue);text-decoration:none;width:100%;border:none;font:inherit;text-align:left;cursor:pointer}.purchase-panel{margin:-6px 0 12px;padding:14px;border-radius:var(--radius-sm);background:var(--secondary-bg);border:1px solid var(--hairline-soft)}.purchase-email-label{display:block;font-size:.8rem;color:var(--hint);margin-bottom:10px}.purchase-email-input{display:block;width:100%;margin-top:5px}.purchase-consent-note{font-size:.8rem;line-height:1.45;color:var(--hint);margin:10px 0 0}.locked-course-hint{margin:-6px 0 12px;padding:10px 13px;border-radius:var(--radius-sm);background:var(--hairline-soft);color:var(--hint);font-size:.85rem}.course-list-card.locked{background:linear-gradient(135deg,var(--course-locked-a) 0%,var(--course-locked-b) 100%);color:var(--course-locked-text);box-shadow:none}.course-list-card.locked .badge-tag{background:#ffffff8c;color:var(--course-locked-text)}.course-list-card-photo{width:100%;height:160px;border-radius:16px;object-fit:cover}.course-list-card-body{display:flex;flex-direction:column;gap:8px;min-width:0}.course-list-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.course-list-card-title{font-size:1.18rem;font-weight:700;line-height:1.3}.course-list-card-desc{font-size:.9rem;line-height:1.5;color:var(--course-on-blue-muted)}.course-list-card.locked .course-list-card-desc{color:var(--course-locked-text);opacity:.85}.lesson-quick-links{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 0 20px}.quick-link-card{display:flex;align-items:center;gap:9px;padding:12px 13px;border-radius:14px;background:linear-gradient(135deg,var(--course-blue-a) 0%,var(--course-blue-b) 100%);color:var(--course-on-blue);text-decoration:none;font-size:.85rem;font-weight:600;box-shadow:0 6px 14px -10px var(--course-blue-shadow)}.quick-link-icon{font-size:1.1rem}.composer{display:flex;flex-direction:column;gap:8px}.composer-input{min-height:100px}.composer-files{display:flex;flex-wrap:wrap;gap:6px}.composer-file-chip{display:inline-flex;align-items:center;gap:6px;padding:5px 8px 5px 10px;border-radius:999px;background:var(--hairline-soft);font-size:.8rem;font-weight:500}.composer-file-chip button{display:flex;align-items:center;justify-content:center;width:18px;height:18px;border-radius:50%;border:none;background:var(--hairline);color:var(--hint);font-size:.85rem;line-height:1;cursor:pointer;padding:0}.composer-actions{display:flex;align-items:center;gap:10px}.composer-attach{display:flex;align-items:center;justify-content:center;width:40px;height:40px;flex-shrink:0;border-radius:50%;background:var(--hairline-soft);font-size:1.1rem;cursor:pointer;margin-bottom:0}.composer-attach input[type=file]{display:none}.composer-error{flex:1;padding:0;background:none;font-size:.82rem}.composer-send{width:auto;margin-left:auto;padding:10px 22px}.lesson-pager{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:20px 0 0}.lesson-pager-btn{display:flex;align-items:center;gap:8px;padding:12px 13px;border-radius:14px;background:var(--secondary-bg);border:1px solid var(--hairline-soft);text-decoration:none;color:var(--text);min-width:0}.lesson-pager-btn.next{flex-direction:row-reverse;text-align:right;grid-column:2}.lesson-pager-btn.locked{opacity:.6}.lesson-pager-arrow{flex-shrink:0;font-size:1rem;color:var(--hint)}.lesson-pager-text{min-width:0;display:flex;flex-direction:column;gap:2px}.lesson-pager-label{font-size:.7rem;color:var(--hint);font-weight:600}.lesson-pager-title{font-size:.86rem;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tab-shell{min-height:100vh;display:flex;flex-direction:column}.tab-content{flex:1;padding-bottom:60px}.tab-bar{position:fixed;left:0;right:0;bottom:0;z-index:10;background:var(--bg);border-top:1px solid var(--hairline-soft);padding:8px 8px calc(8px + var(--safe-bottom))}.tab-bar-inner{display:flex;max-width:640px;margin:0 auto}.tab-bar-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;padding:6px 0;text-decoration:none;color:var(--hint);font-size:.68rem;font-weight:600}.tab-bar-item.active{color:var(--link)}.tab-bar-icon{position:relative;font-size:1.3rem;line-height:1}.tab-bar-badge{position:absolute;top:-4px;right:-9px;min-width:15px;height:15px;padding:0 3px;border-radius:999px;background:var(--danger);color:#fff;font-size:.6rem;font-weight:700;display:flex;align-items:center;justify-content:center}.homework-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 14px;border-radius:14px;background:var(--secondary-bg);border:1px solid var(--hairline-soft);text-decoration:none;color:var(--text)}.homework-row-body{flex:1;display:flex;flex-direction:column;gap:2px;min-width:0}.homework-row .badge{flex-shrink:0;white-space:nowrap}.homework-row-course{font-size:.72rem;color:var(--hint);font-weight:600}.homework-row-title{font-size:.92rem;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.thread{display:flex;flex-direction:column;gap:8px;margin-bottom:4px}.thread-bubble{max-width:85%;padding:10px 13px;border-radius:14px;font-size:.92rem;line-height:1.45;white-space:pre-wrap}.thread-bubble.out{align-self:flex-end;background:var(--button);color:var(--button-text);border-bottom-right-radius:4px}.thread-bubble.in{align-self:flex-start;background:var(--secondary-bg);border:1px solid var(--hairline-soft);border-bottom-left-radius:4px}.thread-files{display:flex;flex-direction:column;gap:4px;margin-top:6px}.thread-files a{color:inherit;font-size:.85rem;text-decoration:underline}.thread-meta{margin-top:5px;font-size:.7rem;opacity:.7}.notification-row{padding:13px 14px;border-radius:14px;background:var(--secondary-bg);border:1px solid var(--hairline-soft)}.notification-row.clickable{cursor:pointer}.notification-row.unread{border-color:color-mix(in srgb,var(--link) 30%,var(--hairline-soft));background:color-mix(in srgb,var(--link) 6%,var(--secondary-bg))}.notification-row-title{font-size:.92rem;font-weight:700;margin-bottom:3px}.notification-row-body{font-size:.87rem;color:var(--text);opacity:.85;margin-bottom:6px;white-space:pre-wrap}.notification-row-date{font-size:.72rem;color:var(--hint)}@media (min-width: 720px){.screen-padded,.tab-bar-inner{max-width:880px}.module-grid{grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}}@media (min-width: 1040px){.screen-padded,.tab-bar-inner{max-width:1080px}.module-grid{grid-template-columns:repeat(auto-fill,minmax(210px,1fr))}.course-hero{padding:28px 26px}.course-hero h1{font-size:1.6rem}}
