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var(--border)}.watch-row-play-btn{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:var(--bg-card-subtle);border:1px solid var(--border);color:var(--text);cursor:pointer;flex-shrink:0;transition:all .18s ease}.watch-playlist-row:hover .watch-row-play-btn{background:var(--accent);color:#ffffff;border-color:var(--accent)}.watch-empty-screen,.watch-loading-screen{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;background:var(--bg);color:var(--text);padding:30px;text-align:center}.watch-empty-screen h2{font-size:20px;margin:0}.watch-empty-screen p{color:var(--text-muted);margin:0 0 10px}@media (max-width:960px){.watch-page-header,.watch-top-nav{padding:10px 14px}.nav-course-brand,.watch-course-title-text{max-width:170px;font-size:13px}.watch-category-badge{display:none}.watch-content-layout,.watch-main-layout{display:flex!important;flex-direction:column!important;padding:0 0 70px!important}.watch-content-layout,.watch-left-col,.watch-main-layout,.watch-theater-col{width:100%!important;max-width:100%!important;margin:0!important;gap:0!important}.watch-left-col,.watch-theater-col{padding:0!important}.watch-info-section{padding:14px 14px 0!important;width:100%!important;gap:14px}.watch-lecture-title{font-size:17.5px;line-height:1.32}.watch-action-bar{overflow-x:auto;flex-wrap:nowrap;padding:4px 0 12px;-webkit-overflow-scrolling:touch;scrollbar-width:none}.watch-action-bar::-webkit-scrollbar{display:none}.watch-action-btn{flex-shrink:0;padding:7px 14px;font-size:12px;gap:6px}.watch-right-col{width:100%!important;max-width:100%!important;position:static!important;margin-top:18px!important;padding:0 14px!important}.watch-playlist-panel{width:100%!important;max-height:440px!important}.watch-topic-card{padding:14px!important}}@media (max-width:768px){.watch-player-box,.watch-theater-col .player-box{border-radius:0!important;border-left:none!important;border-right:none!important;border-top:none!important;box-shadow:none!important}.watch-player-box .player-top-overlay{padding:8px 10px 18px!important;background:linear-gradient(180deg,rgba(0,0,0,.8) 0,transparent)!important}.watch-player-box .player-title-block{display:none!important}.watch-player-box .player-top-actions{margin-left:auto}.watch-player-box .player-center-overlay{gap:24px!important}.watch-player-box .player-center-glass-play{width:48px!important;height:48px!important}.watch-player-box .player-center-skip-arrow{padding:4px 6px!important}.watch-player-box .player-bottom-overlay{padding:18px 10px 8px!important;background:linear-gradient(0deg,rgba(0,0,0,.9) 0,transparent)!important;gap:4px!important}.watch-player-box .player-seekbar-container{height:14px!important}.watch-player-box .player-controls-dock{gap:6px!important}.watch-player-box .dock-group-left,.watch-player-box .dock-group-right{gap:4px!important}.watch-player-box .dock-ctrl-btn{width:28px!important;height:28px!important;border-radius:6px!important}.watch-player-box .dock-volume-box,.watch-player-box .quality-chip-btn{display:none!important}.watch-player-box .speed-chip-btn{padding:0 6px!important;font-size:11px!important;height:26px!important}.watch-player-box .dock-time-display{font-size:11px!important;gap:3px!important;padding:0 2px!important}.watch-lecture-title{font-size:17px!important;line-height:1.35!important}}@media (max-width:480px){.watch-page-header{padding:8px 10px!important;gap:8px!important}.watch-back-link span{display:none!important}.watch-back-link{padding:6px 10px!important;gap:0!important}.watch-course-title-text{max-width:140px!important;font-size:12px!important}.watch-category-badge{display:none!important}.watch-theme-toggle-btn{width:32px!important;height:32px!important}.watch-lecture-title{font-size:15.5px!important}.watch-action-btn{padding:6px 12px!important;font-size:11.5px!important}}@keyframes skeletonShimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.skeleton-box{background:linear-gradient(90deg,var(--bg-card-subtle) 0,var(--bg-card-hover) 50%,var(--bg-card-subtle) 100%);background-size:200% 100%;animation:skeletonShimmer 1.5s ease-in-out infinite}.skeleton-player-box{width:100%;aspect-ratio:16/9;max-height:calc(100vh - 160px);background:#0f0f12;border-radius:var(--r-lg,16px);border:1px solid var(--border);position:relative;overflow:hidden;background:linear-gradient(90deg,rgba(255,255,255,.02),rgba(255,255,255,.06) 50%,rgba(255,255,255,.02));background-size:200% 100%;animation:skeletonShimmer 1.8s ease-in-out infinite}.skeleton-center-play-pulse,.skeleton-player-box{display:flex;align-items:center;justify-content:center}.skeleton-center-play-pulse{width:58px;height:58px;border-radius:50%;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);color:var(--accent);animation:pulse 1.6s ease-in-out infinite}.skeleton-player-bottom-bar{position:absolute;bottom:12px;left:16px;right:16px;height:4px;border-radius:2px;background:rgba(255,255,255,.08)}.skeleton-btn{width:76px;height:34px;border-radius:var(--r-pill)}.skeleton-title-pill{width:180px;height:24px;border-radius:var(--r-pill)}.skeleton-icon-btn{width:36px;height:36px;border-radius:50%}.skeleton-chip{height:24px;border-radius:var(--r-pill)}.skeleton-action-btn{height:36px;border-radius:var(--r-pill)}.skeleton-desc-card{width:100%;padding:20px;border-radius:var(--r-lg);border:1px solid var(--border);min-height:100px}.skeleton-playlist-row{display:flex;align-items:center;gap:12px;padding:10px 8px;border-radius:var(--r-md)}.course-card,.lecture-card-grid,.subject-folder-card,.video-row{transform:translateZ(0);backface-visibility:hidden;will-change:transform}.load-more-lectures-btn:hover{background:var(--bg-card-hover)!important;border-color:var(--accent)!important;transform:translateY(-1px)}@media (min-width:769px){.mobile-bottom-nav{display:none!important}}@media (max-width:768px){#main-content-layout{padding-bottom:calc(72px + env(safe-area-inset-bottom, 0px))!important}.mobile-bottom-nav{position:fixed;bottom:0;left:0;right:0;height:calc(60px + env(safe-area-inset-bottom, 0px));padding-bottom:env(safe-area-inset-bottom,0);background:rgba(var(--bg-rgb,18,17,16),.88);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);border-top:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-around;z-index:95;user-select:none;transition:transform .25s cubic-bezier(.16,1,.3,1),opacity .25s ease}[data-theme=light] .mobile-bottom-nav{background:rgba(250,249,245,.92);border-top:1px solid rgba(232,226,216,.85);box-shadow:0 -4px 20px rgba(0,0,0,.04)}[data-theme=dark] .mobile-bottom-nav{background:rgba(18,17,16,.92);border-top:1px solid rgba(40,38,34,.85);box-shadow:0 -4px 20px rgba(0,0,0,.35)}.mobile-bottom-nav.is-hidden{transform:translateY(100%);opacity:0;pointer-events:none}.mobile-nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;height:100%;background:transparent;border:none;padding:6px 0;color:var(--text-dim);font-size:11px;font-weight:500;cursor:pointer;position:relative;transition:color .18s ease,transform .15s ease;-webkit-tap-highlight-color:transparent}.mobile-nav-item:active{transform:scale(.92)}.mobile-nav-item.active{color:var(--accent);font-weight:600}.mobile-nav-icon-wrap{position:relative;display:flex;align-items:center;justify-content:center;width:28px;height:24px;transition:transform .2s cubic-bezier(.16,1,.3,1)}.mobile-nav-item.active .mobile-nav-icon-wrap{transform:translateY(-1px)}.mobile-nav-indicator{position:absolute;top:0;left:50%;transform:translateX(-50%);width:20px;height:2.5px;border-radius:999px;background:var(--accent);box-shadow:0 0 8px var(--accent-glow)}.mobile-nav-label{letter-spacing:-.1px;line-height:1}}.subject-discipline-card{transition:transform .25s cubic-bezier(.16,1,.3,1),box-shadow .25s cubic-bezier(.16,1,.3,1),border-color .2s ease}.subject-discipline-card:hover{transform:translateY(-3px);border-color:rgba(99,102,241,.35)!important;box-shadow:0 14px 30px -4px rgba(0,0,0,.08),0 4px 12px rgba(0,0,0,.04)!important}[data-theme=dark] .subject-discipline-card:hover{box-shadow:0 14px 32px -4px rgba(0,0,0,.45),0 0 20px rgba(99,102,241,.12)!important}.course-card-enhanced{transition:transform .25s cubic-bezier(.16,1,.3,1),box-shadow .25s cubic-bezier(.16,1,.3,1),border-color .2s ease}.course-card-enhanced:hover{transform:translateY(-3px);border-color:var(--border-hover)!important;box-shadow:var(--sh-card-hover)!important}.course-card-enhanced:hover img{transform:scale(1.04)}.course-list-item-hover{transition:all .2s cubic-bezier(.16,1,.3,1)}.course-list-item-hover:hover{background:var(--bg-card-hover)!important;border-color:var(--border-hover)!important;transform:translateX(2px)}@media (max-width:768px){.gov-exams-container{padding-top:4px!important}}