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#0f8dff14}.lesson-left{display:flex;align-items:center;gap:10px;min-width:0}.lesson-index{width:34px;min-width:34px;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:4px;flex-shrink:0}.lesson-lock,.lesson-open-icon{font-size:14px}.lesson-number{font-size:11px;color:#d6dceb;font-weight:500}.lesson-icon-image{width:18px;height:18px;object-fit:contain;display:block}.lesson-lock,.lesson-open-icon{width:18px;height:18px;display:flex;align-items:center;justify-content:center;line-height:1}.lesson-content{min-width:0}.lesson-title{font-size:15px;font-weight:700;line-height:1.2}.lesson-meta{margin-top:4px;font-size:11px;color:var(--muted)}.dot{margin:0 4px}.lesson-arrow{color:#9098aa;font-size:16px;margin-left:8px;flex-shrink:0}.lesson-details{background:linear-gradient(180deg,#161b26,#121722);border-radius:16px;padding:14px;border:1px solid rgba(255,255,255,.04)}.lesson-details-text{font-size:14px;color:#d2d8e4;line-height:1.55}.lesson-actions{display:flex;gap:10px;margin-top:14px}.lesson-action-button,.lesson-secondary-button{border:none;border-radius:14px;padding:12px 16px;cursor:pointer;font-weight:500}.lesson-action-button{background:var(--blue);color:#fff}.lesson-secondary-button{background:#2d3444;color:#fff}.bottom-nav{position:fixed;left:16px;right:16px;bottom:16px;z-index:20;display:grid;grid-template-columns:repeat(4,1fr);gap:6px;padding:8px;border-radius:22px;background:#11141cf2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:0 16px 40px #00000059}.bottom-nav-item{border:none;background:transparent;color:#c1c7d4;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:8px 4px;border-radius:14px;cursor:pointer}.bottom-nav-item.active{background:#0f8dff29;color:#fff}.bottom-nav-icon{font-size:16px;line-height:1}.bottom-nav-label{font-size:10px;line-height:1}.loading{min-height:100vh;display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff}@media (min-width: 768px){.app-page{padding:28px}.app-screen{min-height:auto;width:min(100%,920px);border-radius:36px;padding:28px 28px 110px;box-shadow:0 30px 80px #00000047}.header-title{font-size:20px}.header-label{font-size:13px}.module-title{font-size:40px}.module-subtitle,.module-count{font-size:15px}.progress-grid{gap:6px}.chat-row{grid-template-columns:minmax(0,1fr) 180px;gap:12px}.chat-main-title,.chat-side-title{font-size:18px}.chat-main-subtitle,.chat-side-subtitle{font-size:14px}.lesson-row{padding:18px;border-radius:24px}.lesson-index{width:42px;height:42px}.lesson-number{font-size:14px}.lesson-title{font-size:24px}.lesson-meta{font-size:15px}.lesson-arrow{font-size:22px}.lesson-details{padding:20px;border-radius:22px}.lesson-details-text{font-size:16px}.bottom-nav{position:sticky;left:auto;right:auto;bottom:0;margin-top:18px}.bottom-nav-label{font-size:12px}}@media (max-width: 480px){.app-screen{padding:16px 16px 110px}.chat-row{grid-template-columns:1fr 110px}.lesson-actions{flex-wrap:wrap}}