@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";
*{box-sizing:border-box;margin:0;padding:0}:root{--bg-primary:#18181b;--bg-secondary:#1a1a1d;--bg-tertiary:#2e2e32;--bg-elevated:#3a3a3f;--bg-chat:#27272a;--bg-input:#2e2e32;--bg-hover:#ffffff0d;--bg-active:#ffffff14;--bg-message-hover:#ffffff05;--text-primary:#f4f4f5;--text-secondary:#a1a1aa;--text-muted:#71717a;--text-inverse:#18181b;--accent:#ff6a36;--accent-strong:#ff6a36;--accent-glow:#ff5c222e;--green:#4ade80;--green-bg:#4ade801f;--red:#f87171;--red-bg:#f871711f;--orange:#ff6a36;--orange-bg:#ff5c221f;--border:#ffffff12;--border-strong:#ffffff1f;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 12px #0006;--shadow-lg:0 8px 24px #00000080;--radius-sm:6px;--radius:10px;--radius-lg:14px;--radius-xl:20px;--sidebar-width:280px;--channel-width:280px;--transition:.15s ease}html,body{height:100%;overflow:hidden}body{background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.5}.app-layout{width:100vw;height:100vh;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);flex-direction:column;display:flex;overflow:hidden}.sidebar__header{border-bottom:1px solid var(--border);padding:20px 18px 16px}.sidebar__title{color:var(--text-primary);align-items:center;gap:10px;font-size:1.15rem;font-weight:700;display:flex}.sidebar__title-icon{font-size:1.3rem}.sidebar__search{margin-top:12px;position:relative}.sidebar__search-input{background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text-primary);transition:border-color var(--transition);outline:none;padding:8px 12px 8px 34px;font-family:inherit;font-size:.82rem}.sidebar__search-input:focus{border-color:var(--accent)}.sidebar__search-input::placeholder{color:var(--text-muted)}.sidebar__search-icon{color:var(--text-muted);pointer-events:none;font-size:.85rem;position:absolute;top:50%;left:11px;transform:translateY(-50%)}.sidebar__rooms{flex:1;padding:6px;overflow-y:auto}.sidebar__label{text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);padding:14px 12px 6px;font-size:.68rem;font-weight:600}.room-item{border-radius:var(--radius);cursor:pointer;transition:all var(--transition);align-items:center;gap:12px;margin-bottom:2px;padding:10px 12px;display:flex}.room-item:hover{background:var(--bg-hover)}.room-item.active{background:var(--bg-active)}.room-item__avatar{color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:38px;height:38px;font-size:.85rem;font-weight:600;display:flex;position:relative}.room-item__info{flex:1;min-width:0}.room-item__name{white-space:nowrap;text-overflow:ellipsis;font-size:.88rem;font-weight:500;overflow:hidden}.room-item__preview{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;margin-top:1px;font-size:.75rem;overflow:hidden}.room-item__meta{flex-direction:column;flex-shrink:0;align-items:flex-end;gap:4px;display:flex}.room-item__time{color:var(--text-muted);font-size:.68rem}.room-item__badge{color:#18181b;background:#f4f4f5;border-radius:9px;justify-content:center;align-items:center;min-width:18px;height:18px;padding:0 5px;font-size:.65rem;font-weight:700;display:flex}.add-room-btn{border-radius:var(--radius);color:var(--text-muted);cursor:pointer;transition:all var(--transition);background:0 0;border:1px dashed #ffffff1f;align-items:center;gap:8px;margin:4px 6px;padding:10px 12px;font-family:inherit;font-size:.82rem;display:flex}.add-room-btn:hover{border-color:var(--accent);color:var(--accent);background:var(--bg-active)}.sidebar__profile{border-top:1px solid var(--border);background:#00000026;align-items:center;gap:10px;padding:14px 16px;display:flex}.sidebar__profile-avatar{background:linear-gradient(135deg, var(--green), #22c55e);width:34px;height:34px;color:var(--text-inverse);border-radius:50%;justify-content:center;align-items:center;font-size:.8rem;font-weight:600;display:flex}.sidebar__profile-info{flex:1}.sidebar__profile-name{word-break:keep-all;overflow-wrap:break-word;font-size:.85rem;font-weight:500;line-height:1.2}.sidebar__profile-role{color:var(--text-muted);font-size:.7rem}.channel-panel{width:var(--channel-width);min-width:var(--channel-width);background:var(--bg-secondary);border-right:1px solid var(--border);flex-direction:column;display:flex}.channel-panel__header{border-bottom:1px solid var(--border);padding:20px 18px 16px}.channel-panel__room-name{align-items:center;gap:8px;font-size:1rem;font-weight:600;display:flex}.channel-panel__sub{color:var(--text-muted);margin-top:3px;font-size:.73rem}.channel-list{flex:1;padding:8px;overflow-y:auto}.channel-list__label{text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);justify-content:space-between;align-items:center;padding:14px 10px 6px;font-size:.68rem;font-weight:600;display:flex}.channel-list__add-btn{color:var(--text-muted);cursor:pointer;transition:all var(--transition);background:0 0;border:none;border-radius:4px;padding:2px 4px;font-size:.95rem}.channel-list__add-btn:hover{color:var(--accent);background:var(--bg-hover)}.channel-item{border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);color:var(--text-secondary);align-items:center;gap:10px;margin-bottom:1px;padding:8px 10px;font-size:.88rem;display:flex}.channel-item:hover{background:var(--bg-hover);color:var(--text-primary)}.channel-item.active{background:var(--bg-active);color:var(--text-primary);font-weight:500}.channel-item__icon{flex-shrink:0;justify-content:center;align-items:center;font-size:1.1rem;display:flex}.channel-item__name{white-space:nowrap;text-overflow:ellipsis;flex:1;line-height:1;overflow:hidden;transform:translateY(-1px)}.channel-item__unread{background:#f4f4f5;border-radius:50%;flex-shrink:0;width:7px;height:7px}.lesson-btn{border-radius:var(--radius);color:#fff;cursor:pointer;background:linear-gradient(135deg,#ff6a36,#e04d1a);border:none;justify-content:center;align-items:center;gap:8px;margin:8px 10px 12px;padding:11px;font-family:inherit;font-size:.88rem;font-weight:600;transition:all .2s;display:flex;box-shadow:0 2px 8px #ff5c2240}.lesson-btn:hover{transform:translateY(-1px);box-shadow:0 4px 16px #ff5c2259}.lesson-btn--active{background:linear-gradient(135deg,#22c55e,#16a34a);animation:2s ease-in-out infinite call-indicator-glow;box-shadow:0 2px 8px #22c55e40}.lesson-btn--active:hover{box-shadow:0 4px 16px #22c55e59}.call-active-indicator{border-radius:var(--radius);cursor:pointer;transition:all var(--transition);background:#4ade801a;border:1px solid #4ade8040;align-items:center;gap:10px;margin:0 8px;padding:10px 14px;animation:2s ease-in-out infinite call-indicator-glow;display:flex}.call-active-indicator:hover{background:#4ade802e;border-color:#4ade8066}.call-active-indicator__dot{background:#4ade80;border-radius:50%;flex-shrink:0;width:10px;height:10px;animation:1.5s ease-in-out infinite call-dot-pulse}.call-active-indicator__text{color:#4ade80;font-size:.82rem;font-weight:500}@keyframes call-dot-pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.85)}}@keyframes call-indicator-glow{0%,to{box-shadow:0 0 #4ade8000}50%{box-shadow:0 0 8px 2px #4ade8026}}.chat-panel{background:var(--bg-chat);flex-direction:column;flex:1;min-width:0;min-height:0;display:flex;overflow:hidden}.chat-panel__header{border-bottom:1px solid var(--border);background:var(--bg-chat);align-items:center;gap:10px;padding:14px 24px;display:flex}.chat-panel__channel-icon{font-size:1.15rem}.chat-panel__channel-name{font-size:.95rem;font-weight:600}.chat-panel__divider{background:var(--border-strong);width:1px;height:18px;margin:0 6px}.chat-panel__channel-desc{color:var(--text-muted);font-size:.78rem}.messages{flex-direction:column;flex:1;gap:2px;padding:16px 20px;display:flex;overflow-y:auto}.message{border-radius:var(--radius-sm);gap:12px;padding:6px 8px;transition:background .1s;display:flex}.message:hover{background:var(--bg-message-hover)}.message__avatar{color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:38px;height:38px;font-size:.85rem;font-weight:600;display:flex}.message__body{flex:1;min-width:0}.message__header{align-items:baseline;gap:8px;margin-bottom:3px;display:flex}.message__author{font-size:.88rem;font-weight:600}.message__time{color:var(--text-muted);font-size:.68rem}.message__timestamp-compact{text-align:right;width:48px;color:var(--text-muted);opacity:0;flex-shrink:0;margin-top:2px;padding-right:4px;font-size:.65rem;transition:opacity .15s}.message__content{color:var(--text-secondary);word-break:break-word;white-space:pre-wrap;font-size:.88rem;line-height:1.65}.message__content--system{color:var(--text-muted);background:var(--bg-secondary);border-radius:var(--radius-sm);border-left:3px solid var(--accent);padding:6px 12px;font-size:.82rem;font-style:italic}.message__content--summary{white-space:pre-line;background:var(--bg-secondary);border-radius:var(--radius);border-left:3px solid var(--accent);margin-top:4px;padding:12px 16px;font-size:.85rem;line-height:1.7}.message__file{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius);transition:background var(--transition);align-items:center;gap:12px;max-width:420px;margin-top:6px;padding:12px 16px;text-decoration:none;display:inline-flex}.message__file:hover{background:var(--bg-elevated)}.message__file-icon-wrap{color:var(--accent);justify-content:center;align-items:center;display:flex}.message__file-info{flex-direction:column;gap:2px;display:flex;overflow:hidden}.message__file-name{color:#fca586;white-space:nowrap;text-overflow:ellipsis;font-size:.88rem;font-weight:500;overflow:hidden}.message__file:hover .message__file-name{text-decoration:underline}.message__file-size{color:var(--text-muted);font-size:.75rem}.chat-input{padding:0 20px 20px}.chat-input__wrapper{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-lg);transition:all var(--transition);align-items:center;gap:6px;padding:4px 6px 4px 16px;display:flex}.chat-input__wrapper:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.chat-input__field{color:var(--text-primary);resize:none;background:0 0;border:none;outline:none;flex:1;padding:10px 0;font-family:inherit;font-size:.88rem;line-height:1.5}.chat-input__field::-webkit-scrollbar{display:none}.chat-input__field::placeholder{color:var(--text-muted)}.chat-input__btn{cursor:pointer;width:34px;height:34px;transition:all var(--transition);color:var(--text-muted);background:0 0;border:none;border-radius:8px;justify-content:center;align-items:center;font-size:1rem;display:flex}.chat-input__btn:hover{background:var(--bg-hover);color:var(--text-primary)}.chat-input__btn--send{color:#18181b;border-radius:var(--radius);background:#f4f4f5}.chat-input__btn--send:hover{background:#d4d4d8}.empty-state{color:var(--text-muted);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:10px;padding:40px;display:flex}.empty-state__icon{opacity:.6;font-size:2.5rem}.empty-state__title{color:var(--text-secondary);font-size:1.1rem;font-weight:600}.empty-state__desc{text-align:center;max-width:280px;font-size:.85rem;line-height:1.6}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#ffffff14;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#ffffff26}.mobile-menu-btn{color:var(--text-primary);cursor:pointer;border-radius:var(--radius-sm);transition:background var(--transition);background:0 0;border:none;padding:6px;display:none}.mobile-menu-btn:hover{background:var(--bg-hover)}.mobile-overlay{z-index:90;opacity:0;background:#0009;transition:opacity .25s;display:none;position:fixed;inset:0}.mobile-overlay.visible{opacity:1}@supports (padding:env(safe-area-inset-top)){.chat-panel__header{padding-top:calc(14px + env(safe-area-inset-top))}.sidebar__header,.channel-panel__header{padding-top:calc(20px + env(safe-area-inset-top))}.chat-input{padding-bottom:calc(20px + env(safe-area-inset-bottom))}}@media (max-width:1024px){:root{--sidebar-width:240px;--channel-width:240px}}@media (max-width:768px){:root{--sidebar-width:300px;--channel-width:280px}.mobile-menu-btn{justify-content:center;align-items:center;display:flex}.mobile-overlay{display:block}.sidebar{z-index:100;box-shadow:var(--shadow-lg);transition:transform .3s cubic-bezier(.4,0,.2,1);position:fixed;top:0;bottom:0;left:0;transform:translate(-100%)}.sidebar.mobile-open{transform:translate(0)}.channel-panel{z-index:100;box-shadow:var(--shadow-lg);transition:transform .3s cubic-bezier(.4,0,.2,1);position:fixed;top:0;bottom:0;left:0;transform:translate(-100%)}.channel-panel.mobile-open{transform:translate(0)}.chat-panel__header{gap:8px;padding:10px 12px}.chat-panel__channel-name{font-size:.88rem}.chat-panel__channel-desc,.chat-panel__divider{display:none}.messages{padding:12px 10px}.chat-input{padding:0 10px 12px}.message__file{max-width:100%}.modal-overlay{padding:16px}.modal-content{max-width:100%;max-height:90vh}.login-card{padding:32px 24px 28px}.context-menu__item{padding:10px 14px;font-size:.88rem}.lesson-controls{gap:12px}.lesson-controls__btn{width:48px;height:48px}.guide-view{padding:20px 16px}.booking-calendar__grid{gap:2px}.booking-slots__grid{grid-template-columns:repeat(2,1fr)}.dashboard-view{padding:20px 16px}}@media (max-width:480px){.chat-panel__header{padding:8px 10px}.messages{padding:8px 6px}.chat-input{padding:0 8px 10px}.message{gap:8px;padding:4px}.message__avatar{width:32px;height:32px;font-size:.75rem}.message__author,.message__content{font-size:.82rem}.login-card{border-radius:var(--radius-lg);padding:28px 20px 24px}.login-card__title{font-size:1.3rem}.booking-slots__grid{grid-template-columns:1fr}}.login-page{background:var(--bg-primary);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex;position:relative;overflow:hidden}.login-bg-glow{filter:blur(120px);opacity:.15;pointer-events:none;border-radius:50%;position:absolute}.login-bg-glow--1{background:var(--accent);width:500px;height:500px;top:-150px;right:-100px}.login-bg-glow--2{background:#a855f7;width:400px;height:400px;bottom:-100px;left:-80px}.login-card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:400px;box-shadow:var(--shadow-lg);z-index:1;padding:44px 36px 36px;animation:.5s ease-out loginCardIn;position:relative}@keyframes loginCardIn{0%{opacity:0;transform:translateY(16px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.login-card__logo{text-align:center;margin-bottom:32px}.login-card__logo-icon{background:linear-gradient(135deg, var(--accent), #e04d1a);color:#fff;border-radius:16px;justify-content:center;align-items:center;width:56px;height:56px;margin:0 auto 14px;display:flex;box-shadow:0 4px 20px #ff5c224d}.login-card__title{color:var(--text-primary);letter-spacing:-.02em;font-size:1.5rem;font-weight:700}.login-card__subtitle{color:var(--text-muted);margin-top:4px;font-size:.82rem}.login-form{flex-direction:column;gap:18px;display:flex}.login-form__error{background:var(--red-bg);border-radius:var(--radius);color:var(--red);text-align:center;border:1px solid #f8717133;padding:10px 14px;font-size:.82rem;animation:.4s shakeError}@keyframes shakeError{0%,to{transform:translate(0)}20%{transform:translate(-6px)}40%{transform:translate(6px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}.login-form__group{flex-direction:column;gap:6px;display:flex}.login-form__label{color:var(--text-secondary);font-size:.78rem;font-weight:500}.login-form__input{background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text-primary);transition:all var(--transition);outline:none;padding:12px 14px;font-family:inherit;font-size:.9rem}.login-form__input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.login-form__input::placeholder{color:var(--text-muted)}.login-form__submit{border-radius:var(--radius);color:#fff;cursor:pointer;background:linear-gradient(135deg,#ff6a36,#e04d1a);border:none;justify-content:center;align-items:center;min-height:46px;margin-top:4px;padding:13px;font-family:inherit;font-size:.92rem;font-weight:600;transition:all .2s;display:flex;box-shadow:0 2px 12px #ff5c2240}.login-form__submit:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 20px #ff5c2266}.login-form__submit:active:not(:disabled){transform:translateY(0)}.login-form__submit:disabled{opacity:.7;cursor:not-allowed}.login-form__spinner{border:2px solid #ffffff4d;border-top-color:#fff;border-radius:50%;width:20px;height:20px;animation:.6s linear infinite loginSpin}@keyframes loginSpin{to{transform:rotate(360deg)}}.login-card__footer{text-align:center;color:var(--text-muted);margin-top:24px;font-size:.75rem}.logout-btn{color:var(--text-muted);cursor:pointer;transition:all var(--transition);background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;padding:6px;display:flex}.logout-btn:hover{color:var(--red);background:var(--red-bg)}.connection-status{z-index:1000;color:#f59e0b;background:#f59e0b26;border-bottom:1px solid #f59e0b4d;justify-content:center;align-items:center;gap:8px;padding:6px;font-size:.78rem;font-weight:500;animation:2s ease-in-out infinite connectionPulse;display:flex;position:fixed;top:0;left:0;right:0}.connection-status__dot{background:#f59e0b;border-radius:50%;width:6px;height:6px;animation:1s ease-in-out infinite connectionDotPulse}@keyframes connectionPulse{0%,to{opacity:.8}50%{opacity:1}}@keyframes connectionDotPulse{0%,to{transform:scale(1)}50%{transform:scale(1.4)}}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:2000;background:#0009;justify-content:center;align-items:center;animation:.2s ease-out modalOverlayIn;display:flex;position:fixed;inset:0}@keyframes modalOverlayIn{0%{opacity:0}to{opacity:1}}.modal{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:420px;box-shadow:var(--shadow-lg);animation:.25s ease-out modalIn;overflow:hidden}@keyframes modalIn{0%{opacity:0;transform:translateY(12px)scale(.97)}to{opacity:1;transform:translateY(0)scale(1)}}.modal__header{color:var(--text-primary);border-bottom:1px solid var(--border);padding:20px 24px 16px;font-size:1.05rem;font-weight:600}.modal__body{flex-direction:column;gap:16px;padding:20px 24px;display:flex}.modal__label{color:var(--text-secondary);flex-direction:column;gap:6px;font-size:.78rem;font-weight:500;display:flex}.modal__input{background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text-primary);transition:all var(--transition);outline:none;padding:10px 12px;font-family:inherit;font-size:.88rem}.modal__input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.modal__input::placeholder{color:var(--text-muted)}.modal__error{background:var(--red-bg);border-radius:var(--radius);color:var(--red);border:1px solid #f8717133;padding:8px 12px;font-size:.8rem;animation:.4s shakeError}.modal__hint{color:var(--text-muted);font-size:.75rem;line-height:1.5}.modal__footer{border-top:1px solid var(--border);justify-content:flex-end;gap:10px;padding:16px 24px;display:flex}.modal__btn{border-radius:var(--radius);cursor:pointer;transition:all var(--transition);white-space:nowrap;border:none;padding:9px 20px;font-family:inherit;font-size:.85rem;font-weight:500}.modal__btn--cancel{color:var(--text-secondary);border:1px solid var(--border);background:0 0}.modal__btn--cancel:hover{background:var(--bg-hover);color:var(--text-primary)}.modal__btn--submit{color:#fff;background:linear-gradient(135deg,#ff6a36,#e04d1a);box-shadow:0 2px 8px #ff5c2240}.modal__btn--submit:hover{transform:translateY(-1px);box-shadow:0 4px 12px #ff5c2259}.modal__footer--block{justify-content:space-between;align-items:center}.modal__footer-actions{gap:10px;display:flex}.modal__btn--allday{color:var(--text-secondary);border:1px solid var(--border);background:#ffffff0f}.modal__btn--allday:hover{color:var(--accent);background:#ff6a361a;border-color:#ff6a364d}.icon-picker{grid-template-columns:repeat(6,1fr);gap:6px;max-height:220px;margin-top:8px;padding-right:4px;display:grid;overflow-y:auto}.icon-picker::-webkit-scrollbar{width:6px}.icon-picker::-webkit-scrollbar-track{background:#ffffff05;border-radius:3px}.icon-picker::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:3px}.icon-picker::-webkit-scrollbar-thumb:hover{background:#fff3}.icon-picker__item{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-primary);color:var(--text-muted);cursor:pointer;transition:all var(--transition);flex-direction:column;align-items:center;gap:4px;padding:10px 4px;font-family:inherit;display:flex}.icon-picker__item:hover{color:var(--text-primary);background:var(--bg-hover);border-color:#ffffff26}.icon-picker__item.active{border-color:var(--accent);color:var(--accent);box-shadow:0 0 0 1px var(--accent);background:#ff6a3614}.icon-picker__label{white-space:nowrap;font-size:.65rem;font-weight:500}.modal__toggle{justify-content:space-between;align-items:center;padding:10px 0;display:flex}.modal__toggle-label{color:var(--text-secondary);align-items:center;gap:6px;font-size:.82rem;display:flex}.modal__switch{cursor:pointer;background:#ffffff1a;border:none;border-radius:11px;width:40px;height:22px;padding:0;transition:background .2s;position:relative}.modal__switch.active{background:var(--accent)}.modal__switch-knob{pointer-events:none;background:#fff;border-radius:50%;width:16px;height:16px;transition:transform .2s;position:absolute;top:3px;left:3px}.modal__switch.active .modal__switch-knob{transform:translate(18px)}.chat-panel--dragover{position:relative}.drag-overlay{z-index:100;border:2px dashed var(--accent);border-radius:var(--radius);background:#ff6a3614;justify-content:center;align-items:center;animation:.15s ease-out dragOverlayIn;display:flex;position:absolute;inset:0}@keyframes dragOverlayIn{0%{opacity:0}to{opacity:1}}.drag-overlay__content{color:var(--accent);flex-direction:column;align-items:center;gap:10px;font-size:.95rem;font-weight:600;display:flex}.chat-input__attachments{scrollbar-width:thin;gap:8px;margin-bottom:6px;padding:8px 12px;display:flex;overflow-x:auto}.attachment-preview{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);align-items:center;gap:8px;min-width:180px;max-width:280px;padding:8px 12px;animation:.2s ease-out attachmentIn;display:flex;position:relative}@keyframes attachmentIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.attachment-preview__thumb{object-fit:cover;border-radius:6px;flex-shrink:0;width:40px;height:40px}.attachment-preview__icon{background:var(--bg-tertiary);width:40px;height:40px;color:var(--text-muted);border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;display:flex}.attachment-preview__name{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;font-size:.78rem;font-weight:500;overflow:hidden}.attachment-preview__size{color:var(--text-muted);flex-shrink:0;font-size:.68rem}.attachment-preview__spinner{border:2px solid #ffffff26;border-top-color:var(--accent);border-radius:50%;flex-shrink:0;width:14px;height:14px;animation:.6s linear infinite loginSpin}.attachment-preview__remove{background:var(--bg-elevated);border:1px solid var(--border);width:20px;height:20px;color:var(--text-muted);cursor:pointer;transition:all var(--transition);opacity:0;border-radius:50%;justify-content:center;align-items:center;display:flex;position:absolute;top:-6px;right:-6px}.attachment-preview:hover .attachment-preview__remove{opacity:1}.attachment-preview__remove:hover{background:var(--red);color:#fff;border-color:var(--red)}.message__files{flex-direction:column;gap:6px;margin-top:6px;display:flex}.message__image-wrap{border-radius:var(--radius);cursor:pointer;max-width:400px;transition:opacity .15s;display:block;overflow:hidden}.message__image-wrap:hover{opacity:.9}.message__image{border-radius:var(--radius);object-fit:contain;max-width:100%;max-height:300px;display:block}.message__file-name{white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;overflow:hidden}.message__file-size{color:var(--text-muted);flex-shrink:0;font-size:.72rem}.context-menu{z-index:999;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);min-width:200px;padding:4px 0;animation:.12s ease-out contextMenuIn;position:fixed;box-shadow:0 8px 24px #00000059}@keyframes contextMenuIn{0%{opacity:0;transform:scale(.95)translateY(-4px)}to{opacity:1;transform:scale(1)translateY(0)}}.context-menu__item{width:100%;color:var(--text-primary);cursor:pointer;text-align:left;transition:background var(--transition);background:0 0;border:none;align-items:center;gap:8px;padding:8px 14px;font-size:.82rem;display:flex}.context-menu__item:hover{background:#ffffff0f}.context-menu__item--danger{color:var(--red)}.context-menu__item--danger:hover{background:#ef44441f}.chat-input__reply-bar{border-left:3px solid var(--accent);border-radius:var(--radius) var(--radius) 0 0;background:#ff6a360f;align-items:center;gap:10px;padding:8px 14px;font-size:.8rem;animation:.15s ease-out attachmentIn;display:flex}.chat-input__reply-label{color:var(--accent);flex-shrink:0}.chat-input__reply-text{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;overflow:hidden}.chat-input__reply-close{color:var(--text-muted);cursor:pointer;transition:color var(--transition);background:0 0;border:none;border-radius:4px;flex-shrink:0;padding:2px}.chat-input__reply-close:hover{color:var(--text-primary)}.message--pinned{border-left:2px solid var(--accent);background:#ff6a360a;margin-left:-8px;padding-left:6px}.message__pin-badge{color:var(--accent);margin-left:6px;font-size:.68rem}.message__edited{color:var(--text-muted);margin-left:4px;font-size:.68rem;font-style:italic}.message__reply-ref{border-left:2px solid var(--text-muted);background:#ffffff08;border-radius:2px;align-items:center;gap:6px;margin-bottom:4px;padding:4px 8px;font-size:.75rem;display:flex}.message__reply-ref-author{color:var(--text-secondary);flex-shrink:0;font-weight:600}.message__reply-ref-text{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.message__edit-box{flex-direction:column;gap:6px;margin-top:4px;display:flex}.message__edit-input{background:var(--bg-primary);border:1px solid var(--accent);border-radius:var(--radius);width:100%;color:var(--text-primary);resize:none;outline:none;padding:8px 10px;font-family:inherit;font-size:.85rem;line-height:1.5}.message__edit-input:focus{box-shadow:0 0 0 2px #ff6a3633}.message__edit-actions{justify-content:flex-end;gap:6px;display:flex}.message__edit-btn{cursor:pointer;background:var(--bg-tertiary);color:var(--text-secondary);transition:all var(--transition);border:none;border-radius:4px;padding:4px 10px;font-size:.75rem}.message__edit-btn:hover{background:var(--bg-elevated)}.message__edit-btn--save{background:var(--accent);color:#fff}.message__edit-btn--save:hover{background:#e55a2b}.message__link{color:var(--accent);text-decoration:none}.message__link:hover{text-decoration:underline}.message__link--internal{font-weight:600}.message--highlight{animation:2s ease-out forwards highlightMsg}@keyframes highlightMsg{0%{background:#ff6a3640}to{background:0 0}}.message__mention{color:#cfaaa0;white-space:pre;background:#ff6a361f;border-radius:4px;align-items:center;padding:2px 6px;font-weight:500;transition:all .15s;display:inline-flex}.message__link--internal:hover .message__mention{color:#ebd1c8;background:#ff6a3640}.date-separator{color:var(--text-muted);align-items:center;margin:24px 16px 8px;font-size:.75rem;font-weight:600;display:flex}.date-separator__line{background:var(--border);flex:1;height:1px}.date-separator__label{margin:0 12px}.message--compact{padding-top:2px;padding-bottom:2px}.message__timestamp-compact{text-align:right;width:38px;color:var(--text-muted);opacity:0;-webkit-user-select:none;user-select:none;flex-shrink:0;margin-top:2px;padding-right:0;font-size:.65rem;line-height:1.65;transition:opacity .1s}.message:hover .message__timestamp-compact{opacity:1}.booking-view{flex-direction:column;flex:1;align-items:center;display:flex;overflow-y:auto}.booking-container{flex-direction:column;width:100%;max-width:1000px;padding-bottom:40px;display:flex}.booking-tabs{border-bottom:1px solid var(--border);background:var(--bg-chat);gap:0;width:100%;padding:0 24px;display:flex}.booking-tab{color:var(--text-muted);cursor:pointer;transition:all var(--transition);background:0 0;border:none;border-bottom:2px solid #0000;align-items:center;gap:6px;padding:12px 20px;font-family:inherit;font-size:.88rem;font-weight:500;display:flex}.booking-tab:hover{color:var(--text-primary)}.booking-tab.active{color:var(--text-primary);border-bottom-color:var(--accent)}.booking-tab__badge{background:var(--accent);color:#fff;text-align:center;border-radius:10px;min-width:18px;padding:1px 6px;font-size:.68rem;font-weight:700}.booking-calendar{padding:24px}.booking-calendar__nav{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.booking-calendar__nav-btn{border:1px solid var(--border);border-radius:var(--radius);width:32px;height:32px;color:var(--text-primary);cursor:pointer;transition:all var(--transition);background:0 0;justify-content:center;align-items:center;font-size:1.1rem;display:flex}.booking-calendar__nav-btn:hover:not(:disabled){background:var(--bg-hover);border-color:var(--border-strong)}.booking-calendar__nav-btn:disabled{opacity:.3;cursor:not-allowed}.booking-calendar__month{color:var(--text-primary);font-size:1rem;font-weight:600}.booking-calendar__weekdays{grid-template-columns:repeat(7,1fr);gap:4px;margin-bottom:4px;display:grid}.booking-calendar__weekday{text-align:center;color:var(--text-muted);text-transform:uppercase;padding:4px 0;font-size:.7rem;font-weight:600}.booking-calendar__grid{border-top:1px solid var(--border);border-left:1px solid var(--border);border-radius:var(--radius-lg);grid-template-columns:repeat(7,1fr);gap:0;display:grid;overflow:hidden}.booking-calendar__day{aspect-ratio:auto;cursor:pointer;height:70px;transition:all var(--transition);border-right:1px solid var(--border);border-bottom:1px solid var(--border);border-radius:0;flex-direction:column;justify-content:center;align-items:center;gap:2px;display:flex;position:relative}.booking-calendar__day:hover:not(.booking-calendar__day--past):not(.booking-calendar__day--empty){background:var(--bg-hover)}.booking-calendar__day--empty,.booking-calendar__day--past{cursor:default}.booking-calendar__day--past .booking-calendar__day-number{color:var(--text-muted);opacity:.4}.booking-calendar__day--today .booking-calendar__day-number{background:var(--accent);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:24px;height:24px;display:flex}.booking-calendar__day--selected{box-shadow:inset 0 0 0 1px var(--accent);background:var(--accent-glow)!important}.booking-calendar__day--selected:not(.booking-calendar__day--today) .booking-calendar__day-number{color:var(--accent);font-weight:700}.booking-calendar__day-number{color:var(--text-primary);font-size:.85rem;font-weight:500}.booking-calendar__day-dots{gap:3px;min-height:5px;display:flex}.booking-calendar__day-dot{background:var(--accent);border-radius:50%;width:5px;height:5px}.booking-loading{justify-content:center;padding:16px;display:flex}.booking-teacher-actions{justify-content:center;margin-top:16px;display:flex}.booking-block-btn{border:1px solid var(--border);border-radius:var(--radius);color:var(--text-secondary);cursor:pointer;transition:all var(--transition);background:0 0;padding:8px 16px;font-family:inherit;font-size:.8rem}.booking-block-btn:hover{background:var(--bg-hover);border-color:var(--border-strong);color:var(--text-primary)}.booking-back-btn{color:var(--text-muted);cursor:pointer;transition:color var(--transition);background:0 0;border:none;padding:8px 0;font-family:inherit;font-size:.85rem;display:inline-block}.booking-back-btn:hover{color:var(--text-primary)}.booking-time{padding:24px}.booking-time__header{margin:12px 0 20px}.booking-time__date{color:var(--text-primary);font-size:1.05rem;font-weight:600}.booking-time__sub{color:var(--text-muted);margin-top:4px;font-size:.75rem;display:block}.booking-time__grid{grid-template-columns:repeat(auto-fill,minmax(90px,1fr));gap:8px;display:grid}.booking-time__columns{gap:0;display:flex}.booking-time__column{flex:1;padding:0 16px}.booking-time__column:first-child{border-right:1px solid var(--border)}.booking-time__hour-row{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:10px 0;display:flex}.booking-time__hour-row:last-child{border-bottom:none}.booking-time__hour-label{min-width:32px;color:var(--text-muted);text-align:right;flex-shrink:0;font-size:.85rem;font-weight:600}.booking-time__hour-slots{flex:1;grid-template-columns:repeat(4,1fr);gap:10px;display:grid}.booking-time__empty{text-align:center;color:var(--text-muted);padding:40px 0;font-size:.9rem}.booking-time__slot{border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);cursor:pointer;transition:all var(--transition);background:0 0;flex-direction:column;justify-content:center;align-items:center;gap:4px;width:100%;height:62px;padding:12px 8px;font-family:inherit;font-size:.88rem;display:flex}.booking-time__slot:hover:not(.booking-time__slot--disabled){background:var(--bg-hover);border-color:var(--border-strong)}.booking-time__slot--selected{color:var(--accent);font-weight:600;background:var(--accent-glow)!important;border-color:var(--accent)!important}.booking-time__slot--disabled{cursor:default;opacity:.3}.booking-time__slot-start{font-weight:500}.booking-time__slot-end{color:var(--text-muted);font-size:.7rem}.booking-time__slot--selected .booking-time__slot-end{color:var(--accent);opacity:.7}.booking-time__confirm-bar{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);justify-content:space-between;align-items:center;margin-top:20px;padding:12px 16px;animation:.2s slideUp;display:flex}@keyframes slideUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.booking-time__confirm-info{color:var(--text-secondary);flex-direction:column;gap:2px;font-size:.85rem;display:flex}.booking-time__confirm-time{color:var(--text-primary);font-size:1rem;font-weight:600}.booking-time__confirm-btn{border-radius:var(--radius);background:var(--accent);color:#fff;cursor:pointer;transition:all var(--transition);border:none;align-items:center;gap:4px;padding:8px 20px;font-family:inherit;font-size:.85rem;font-weight:600;display:flex}.booking-time__confirm-btn:hover{filter:brightness(1.1)}.booking-confirm{flex:1;padding:24px;overflow-y:auto}.booking-confirm__card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);max-width:500px;margin:20px auto 0;padding:28px}.booking-confirm__title{color:var(--text-primary);text-align:center;margin-bottom:24px;font-size:1.05rem;font-weight:600}.booking-confirm__row{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:10px 0;display:flex}.booking-confirm__label{color:var(--text-muted);font-size:.85rem}.booking-confirm__value{color:var(--text-primary);font-size:.88rem;font-weight:500}.booking-confirm__notes{margin-top:20px}.booking-confirm__notes-label{color:var(--text-muted);margin-bottom:8px;font-size:.82rem;display:block}.booking-confirm__notes-input{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text-primary);resize:none;transition:border-color var(--transition);outline:none;padding:10px 14px;font-family:inherit;font-size:.85rem}.booking-confirm__notes-input:focus{border-color:var(--accent)}.booking-confirm__notes-input::placeholder{color:var(--text-muted)}.booking-confirm__error{background:var(--red-bg);border-radius:var(--radius);color:var(--red);text-align:center;border:1px solid #f8717133;margin-top:16px;padding:10px 14px;font-size:.82rem}.booking-confirm__info{background:var(--orange-bg);border-radius:var(--radius);color:var(--accent);text-align:center;margin-top:16px;padding:10px 14px;font-size:.8rem}.booking-confirm__submit{border-radius:var(--radius);color:#fff;cursor:pointer;background:linear-gradient(135deg,#ff6a36,#e04d1a);border:none;width:100%;margin-top:20px;padding:13px;font-family:inherit;font-size:.92rem;font-weight:600;transition:all .2s;box-shadow:0 2px 8px #ff5c2240}.booking-confirm__submit:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 16px #ff5c2259}.booking-confirm__submit:disabled{opacity:.6;cursor:not-allowed}.booking-list{flex:1;padding:24px;overflow-y:auto}.booking-list__empty{color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;padding:60px 20px;display:flex}.booking-list__empty-icon{opacity:.6;margin-bottom:12px;font-size:2.5rem}.booking-list__empty-title{color:var(--text-secondary);margin-bottom:4px;font-size:1rem;font-weight:600}.booking-list__empty-desc{text-align:center;font-size:.82rem}.booking-list__item{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);transition:all var(--transition);align-items:center;gap:16px;margin-bottom:8px;padding:16px;display:flex}.booking-list__item:hover{background:var(--bg-tertiary)}.booking-list__item-date{background:var(--accent-glow);border-radius:var(--radius);flex-direction:column;align-items:center;min-width:48px;padding:8px;display:flex}.booking-list__item-month{color:var(--accent);text-transform:uppercase;font-size:.65rem;font-weight:600}.booking-list__item-day{color:var(--text-primary);font-size:1.3rem;font-weight:700;line-height:1}.booking-list__item-weekday{color:var(--text-muted);margin-top:2px;font-size:.65rem}.booking-list__item-info{flex:1;min-width:0}.booking-list__item-time{color:var(--text-primary);font-size:.92rem;font-weight:500}.booking-list__item-student{color:var(--text-secondary);margin-top:2px;font-size:.78rem}.booking-list__item-notes{color:var(--text-muted);margin-top:2px;font-size:.75rem}.booking-list__item-status{border-radius:10px;margin-top:4px;padding:2px 8px;font-size:.72rem;font-weight:600;display:inline-block}.booking-list__item-status--confirmed{background:var(--green-bg);color:var(--green)}.booking-list__item-status--completed{color:#94a3b8;background:#64748b1f}.booking-list__item-cancel{border:1px solid var(--border);border-radius:var(--radius-sm);width:32px;height:32px;color:var(--text-muted);cursor:pointer;transition:all var(--transition);background:0 0;flex-shrink:0;justify-content:center;align-items:center;display:flex}.booking-list__item-cancel:hover{background:var(--red-bg);color:var(--red);border-color:#f871714d}.booking-block-times{grid-template-columns:repeat(auto-fill,minmax(70px,1fr));gap:6px;margin-top:8px;display:grid}.booking-block-time-btn{border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:all var(--transition);background:0 0;padding:8px 4px;font-family:inherit;font-size:.82rem}.booking-block-time-btn:hover{background:var(--bg-hover)}.booking-block-time-btn.active{background:var(--red-bg);color:var(--red);border-color:#f871714d;font-weight:500}.tbv{flex-direction:column;flex:1;display:flex;overflow:hidden}.tbv__header{border-bottom:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.tbv__title{color:var(--text-primary);font-size:1.1rem;font-weight:700}.tbv__block-btn{background:var(--red-bg);color:var(--red);border-radius:var(--radius);cursor:pointer;transition:all var(--transition);border:1px solid #f8717133;padding:8px 16px;font-family:inherit;font-size:.85rem}.tbv__block-btn:hover{background:#f8717126}.tbv__nav{border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:12px;padding:12px 24px;display:flex}.tbv__nav-btn{border:1px solid var(--border);border-radius:var(--radius);width:32px;height:32px;color:var(--text-primary);cursor:pointer;transition:all var(--transition);background:0 0;justify-content:center;align-items:center;font-size:1.1rem;display:flex}.tbv__nav-btn:hover:not(:disabled){background:var(--bg-hover)}.tbv__nav-btn:disabled{opacity:.3;cursor:not-allowed}.tbv__nav-today{border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);cursor:pointer;transition:all var(--transition);background:0 0;padding:6px 14px;font-family:inherit;font-size:.82rem}.tbv__nav-today:hover{background:var(--bg-hover)}.tbv__nav-label{color:var(--text-primary);font-size:.95rem;font-weight:600}.tbv__timeline{flex:1;position:relative;overflow-y:auto}.tbv__loading{z-index:10;position:absolute;top:12px;right:24px}.tbv__grid{flex-direction:column;min-width:100%;display:flex}.tbv__grid-header{border-bottom:2px solid var(--border);background:var(--bg-primary);z-index:5;grid-template-columns:60px repeat(7,1fr);display:grid;position:sticky;top:0}.tbv__grid-day-header{border-left:1px solid var(--border);flex-direction:column;align-items:center;gap:2px;padding:10px 4px;display:flex}.tbv__grid-day-header--today{background:var(--accent-glow)}.tbv__grid-day-weekday{color:var(--text-muted);text-transform:uppercase;font-size:.72rem;font-weight:600}.tbv__grid-day-date{color:var(--text-primary);font-size:1.1rem;font-weight:700}.tbv__grid-day-header--today .tbv__grid-day-date{color:var(--accent)}.tbv__grid-day-count{color:var(--accent);font-size:.68rem;font-weight:500}.tbv__grid-row{border-bottom:1px solid var(--border);grid-template-columns:60px repeat(7,1fr);min-height:70px;display:grid}.tbv__grid-time{color:var(--text-muted);justify-content:flex-end;align-items:flex-start;padding:6px 8px 0 0;font-size:.72rem;font-weight:500;display:flex}.tbv__grid-cell{border-left:1px solid var(--border);min-height:70px;padding:4px;position:relative}.tbv__grid-cell--blocked{background:repeating-linear-gradient(-45deg,#0000,#0000 4px,#f871710d 4px 8px)}.tbv__reservation-card{z-index:10;background:var(--accent-glow);border:1px solid #6366f133;border-left:3px solid var(--accent);border-radius:var(--radius);padding:4px 6px;position:absolute;left:4px;right:4px;overflow:hidden}.tbv__reservation-time{color:var(--text-primary);font-size:.75rem;font-weight:600}.tbv__reservation-student{color:var(--accent);margin-top:2px;font-size:.78rem;font-weight:500}.tbv__reservation-notes{color:var(--text-muted);text-overflow:ellipsis;white-space:nowrap;margin-top:2px;font-size:.7rem;overflow:hidden}.tbv__reservation-cancel{width:20px;height:20px;color:var(--text-muted);cursor:pointer;opacity:0;transition:all var(--transition);background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;display:flex;position:absolute;top:4px;right:4px}.tbv__reservation-card:hover .tbv__reservation-cancel{opacity:1}.tbv__reservation-cancel:hover{background:var(--red-bg);color:var(--red)}.tbv__blocked-label{color:var(--red);opacity:.6;text-align:center;padding-top:8px;font-size:.7rem}.booking-list__header{color:var(--text-primary);padding:16px 0 12px;font-size:1rem;font-weight:600}.lesson-view{background:#18181b;flex-direction:column;flex:1;height:100%;display:flex;overflow:hidden}.lesson-join{text-align:center;flex-direction:column;flex:1;align-items:center;gap:10px;padding:20px 32px;display:flex;overflow-y:auto}.lesson-join__icon{font-size:2rem;animation:2s ease-in-out infinite lessonBounce}@keyframes lessonBounce{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}.lesson-join__title{color:var(--text-primary);margin:0;font-size:1.2rem;font-weight:700}.lesson-join__room{color:var(--text-muted);background:var(--bg-tertiary);border-radius:var(--radius);border:1px solid var(--border);padding:6px 16px;font-size:.9rem}.lesson-join__toggle{align-items:center;gap:12px;margin-top:8px;font-size:.9rem;font-weight:600;display:flex}.lesson-toggle{cursor:pointer;width:44px;height:24px;display:inline-block;position:relative}.lesson-toggle input{opacity:0;width:0;height:0}.lesson-toggle__slider{background:var(--bg-elevated);border-radius:12px;transition:all .2s;position:absolute;inset:0}.lesson-toggle__slider:before{content:"";background:#fff;border-radius:50%;width:18px;height:18px;transition:transform .2s;position:absolute;top:3px;left:3px}.lesson-toggle input:checked+.lesson-toggle__slider{background:var(--accent)}.lesson-toggle input:checked+.lesson-toggle__slider:before{transform:translate(20px)}.lesson-join__langs{width:100%;max-width:400px}.lesson-join__langs-hint{color:var(--text-muted);margin-bottom:12px;font-size:.8rem}.lesson-join__lang-grid{grid-template-columns:repeat(4,1fr);gap:6px;display:grid}.lesson-join__lang-btn{border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;background:0 0;padding:8px 4px;font-family:inherit;font-size:.75rem;transition:all .15s}.lesson-join__lang-btn:hover{background:var(--bg-hover);border-color:var(--border-strong)}.lesson-join__lang-btn.active{background:var(--accent-glow);border-color:var(--accent);color:var(--accent);font-weight:600}.lesson-join__start-btn{border-radius:var(--radius-lg);color:#fff;cursor:pointer;background:linear-gradient(135deg,#ff6a36,#e04d1a);border:none;margin-top:16px;padding:14px 48px;font-family:inherit;font-size:1rem;font-weight:600;transition:all .2s;box-shadow:0 4px 20px #ff5c224d}.lesson-join__start-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 28px #ff5c2266}.lesson-join__start-btn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.lesson-join__cancel-btn{border:1px solid var(--border);border-radius:var(--radius);color:var(--text-muted);cursor:pointer;background:0 0;padding:10px 24px;font-family:inherit;font-size:.85rem;transition:all .15s}.lesson-join__cancel-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.lesson-audio-mode{width:100%;max-width:520px}.lesson-audio-mode__label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:8px;font-size:.75rem;font-weight:600}.lesson-audio-mode__options{gap:8px;display:flex}.lesson-audio-mode__btn{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--bg-tertiary);color:var(--text-secondary);cursor:pointer;flex-direction:column;flex:1;align-items:center;gap:2px;padding:10px 14px;font-family:inherit;font-size:.82rem;transition:all .2s;display:flex}.lesson-audio-mode__btn strong{font-weight:600}.lesson-audio-mode__btn-desc{color:var(--text-muted);font-size:.7rem}.lesson-audio-mode__btn.active .lesson-audio-mode__btn-desc{color:var(--text-secondary)}.lesson-audio-mode__btn:hover{border-color:var(--border-strong);background:var(--bg-hover)}.lesson-audio-mode__btn.active{border-color:var(--accent);color:var(--text-primary);box-shadow:0 0 0 1px var(--accent);background:#ff6a3614}.lesson-audio-mode__btn-icon{text-align:center;flex-shrink:0;width:36px;font-size:1.3rem}.lesson-audio-mode__btn-text{flex-direction:column;gap:2px;min-width:0;display:flex}.lesson-audio-mode__btn-text strong{font-size:.82rem;font-weight:600}.lesson-audio-mode__btn-text small{color:var(--text-muted);font-size:.7rem}.lesson-audio-mode__btn.active .lesson-audio-mode__btn-text small{color:var(--text-secondary)}.lesson-device-select{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-lg);flex-direction:column;gap:10px;width:100%;max-width:520px;padding:10px 14px;display:flex}.lesson-device-select__pair{gap:12px;display:flex}.lesson-device-select__pair>.lesson-device-select__row{flex:1;min-width:0}.lesson-device-select__loading{color:var(--text-muted);text-align:center;padding:8px 0;font-size:.82rem}.lesson-device-select__warning{color:#fbbf24;flex-wrap:wrap;align-items:flex-start;gap:8px;font-size:.8rem;display:flex}.lesson-device-select__retry{border-radius:var(--radius-sm);color:#fbbf24;cursor:pointer;background:#fbbf241a;border:1px solid #fbbf244d;margin-top:4px;padding:4px 12px;font-family:inherit;font-size:.75rem;transition:all .15s}.lesson-device-select__retry:hover{background:#fbbf2433}.lesson-device-select__row{flex-direction:column;gap:4px;display:flex}.lesson-device-select__label{color:var(--text-primary);align-items:center;gap:6px;font-size:.78rem;font-weight:600;display:flex}.lesson-device-select__label-icon{font-size:.9rem}.lesson-device-select__dropdown{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-primary);width:100%;color:var(--text-primary);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-position:right 10px center;background-repeat:no-repeat;outline:none;padding:8px 28px 8px 12px;font-family:inherit;font-size:.8rem;transition:border-color .15s}.lesson-device-select__dropdown:focus{border-color:var(--accent)}.lesson-device-select__dropdown option{background:var(--bg-primary);color:var(--text-primary)}.lesson-device-select__hint{color:var(--text-muted);padding-left:2px;font-size:.7rem}.lesson-device-select__same-warning{color:#f87171;text-align:center;padding:4px 0;font-size:.78rem}.lesson-error{background:var(--red-bg);color:var(--red);text-align:center;border-bottom:1px solid #f8717126;padding:10px 20px;font-size:.82rem}.lesson-videos{background:#000;flex:1;min-height:0;position:relative;overflow:hidden}.lesson-video-remote{width:100%;height:100%;position:relative}.lesson-video-remote video{object-fit:cover;width:100%;height:100%}.lesson-video-placeholder{color:var(--text-muted);background:#0a0a0f;flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex;position:absolute;inset:0}.lesson-waiting-rings{justify-content:center;align-items:center;width:80px;height:80px;font-size:2.5rem;display:flex;position:relative}.lesson-waiting-rings:before,.lesson-waiting-rings:after{content:"";border:2px solid var(--accent);opacity:0;border-radius:50%;animation:2s infinite lessonRingExpand;position:absolute;inset:0}.lesson-waiting-rings:after{animation-delay:1s}@keyframes lessonRingExpand{0%{opacity:.8;transform:scale(.5)}to{opacity:0;transform:scale(1.5)}}.lesson-video-local{border-radius:var(--radius);z-index:2;border:2px solid #fff3;width:160px;height:120px;position:absolute;bottom:16px;right:16px;overflow:hidden;box-shadow:0 4px 16px #00000080}.lesson-video-local video{object-fit:cover;width:100%;height:100%;transform:scaleX(-1)}.lesson-video-off{background:var(--bg-tertiary);color:var(--text-muted);justify-content:center;align-items:center;font-size:.7rem;display:flex;position:absolute;inset:0}.lesson-subtitle{z-index:3;max-width:80%;position:absolute;bottom:150px;left:50%;transform:translate(-50%)}.lesson-subtitle span{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:var(--radius);color:#fff;text-align:center;background:#000000bf;padding:8px 20px;font-size:1rem;line-height:1.5;display:inline-block}.lesson-status-badge{align-items:center;gap:6px;font-size:.78rem;font-weight:500;display:flex}.lesson-status-badge:before{content:"";border-radius:50%;width:6px;height:6px}.lesson-status--waiting:before{background:#818cf8}.lesson-status--connecting:before{background:#fbbf24;animation:1s infinite pulse}.lesson-status--connected{color:#4ade80}.lesson-status--connected:before{background:#22c55e}.lesson-status--disconnected{color:#f87171}.lesson-status--disconnected:before{background:#ef4444}.lesson-translation-badge{border-radius:var(--radius-sm);background:#ffffff0d;padding:2px 8px;font-size:.72rem}.lesson-translation--active{color:#4ade80}.lesson-translation--connecting{color:#fbbf24}.lesson-translation--reconnecting{color:#f59e0b}.lesson-volume__slider{appearance:none;cursor:pointer;background:#ffffff1a;border-radius:2px;outline:none;flex:1;height:4px}.lesson-volume__slider::-webkit-slider-thumb{-webkit-appearance:none;background:var(--accent);cursor:pointer;border:2px solid var(--bg-primary);border-radius:50%;width:14px;height:14px}.lesson-controls{background:var(--bg-secondary);border-top:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;padding:10px 16px;display:flex}.lesson-controls__buttons{flex-shrink:0;align-items:center;gap:10px;display:flex}.lesson-controls__status{flex-direction:column;flex-shrink:0;align-items:center;gap:2px;display:flex}.lesson-controls__right{flex:1;justify-content:flex-end;align-items:center;gap:12px;min-width:0;display:flex}.lesson-controls__levels{flex-direction:column;flex:1;gap:4px;min-width:80px;display:flex}.lesson-level{align-items:center;gap:8px;display:flex}.lesson-level__name{color:var(--text-secondary);text-overflow:ellipsis;white-space:nowrap;text-align:right;flex-shrink:0;width:80px;font-size:.7rem;font-weight:500;overflow:hidden}.lesson-level__bar{background:#ffffff14;border-radius:3px;flex:1;height:5px;overflow:hidden}.lesson-level__fill{background:#22c55e;border-radius:3px;height:100%;transition:width .1s ease-out}.lesson-level__fill--local{background:#3b82f6}.lesson-volume-inline{flex-shrink:0;align-items:center;gap:8px;min-width:120px;max-width:180px;display:flex}.lesson-volume-inline__icon{cursor:default;flex-shrink:0;font-size:.9rem}.lesson-volume-inline__value{color:var(--text-muted);text-align:right;flex-shrink:0;min-width:32px;font-size:.68rem}.lesson-ctrl-btn{border:1px solid var(--border-strong);width:44px;height:44px;color:var(--text-primary);cursor:pointer;background:#ffffff0d;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:1.15rem;transition:all .15s;display:flex}.lesson-ctrl-btn:hover{background:#ffffff1a;border-color:#fff3}.lesson-ctrl-btn--danger{background:var(--red-bg);border-color:#f871714d}.lesson-ctrl-btn--danger:hover{background:#f8717140}.lesson-ctrl-btn--hangup{background:#ef444426;border-color:#ef44444d;transform:rotate(135deg)}.lesson-ctrl-btn--hangup:hover{background:#ef44444d}.lesson-join__options-row{align-items:stretch;gap:10px;width:100%;max-width:520px;display:flex}.lesson-join__options-row>*{flex:1;min-width:0}@media (max-width:768px){.lesson-join__options-row{flex-direction:column}}.lesson-multicam{border:1px solid var(--border);border-radius:var(--radius);background:#ffffff05;padding:12px}.lesson-multicam__header{align-items:center;gap:12px;font-size:.88rem;font-weight:500;display:flex}.lesson-multicam__body{border:1px solid var(--border);border-radius:var(--radius);background:#ffffff08;flex-direction:column;gap:10px;margin-top:12px;padding:12px;animation:.2s ease-out guideSectionOpen;display:flex}.lesson-multicam__hint{color:var(--text-muted);margin:0 0 4px;font-size:.75rem;line-height:1.5}.lesson-translation-row{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-lg);align-items:center;gap:10px;width:100%;max-width:520px;padding:8px 14px;font-size:.85rem;display:flex}.lesson-translation-row__label{white-space:nowrap;font-weight:500}.lesson-translation-row__select{flex:1;min-width:0}.lesson-multicam-wrapper{align-items:center;display:flex;position:relative}.lesson-camera-popup{background:var(--bg-secondary);border:1px solid var(--border-strong);border-radius:var(--radius-lg);z-index:10;min-width:240px;max-width:320px;padding:8px;animation:.2s ease-out cameraPopupIn;position:absolute;bottom:calc(100% + 10px);left:50%;transform:translate(-50%);box-shadow:0 8px 32px #00000080}@keyframes cameraPopupIn{0%{opacity:0;transform:translate(-50%)translateY(8px)}to{opacity:1;transform:translate(-50%)translateY(0)}}.lesson-camera-popup__title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.03em;padding:6px 10px 8px;font-size:.75rem;font-weight:600}.lesson-camera-popup__item{border-radius:var(--radius);width:100%;color:var(--text-primary);cursor:pointer;text-align:left;background:0 0;border:none;align-items:center;gap:10px;padding:10px 12px;font-family:inherit;font-size:.82rem;transition:background .15s;display:flex}.lesson-camera-popup__item:hover{background:#ff6a361a}.lesson-camera-popup__cam-icon{flex-shrink:0;font-size:1.1rem}.lesson-camera-popup__cam-name{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.lesson-camera-popup__empty{color:var(--text-muted);text-align:center;flex-direction:column;align-items:center;gap:8px;padding:12px;font-size:.78rem;display:flex}.lesson-camera-popup__retry{border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;background:#ffffff0d;padding:4px 14px;font-family:inherit;font-size:.72rem;transition:all .15s}.lesson-camera-popup__retry:hover{background:#ffffff1a}.call-invite-overlay{z-index:9999;background:#0009;justify-content:center;align-items:center;animation:.2s fadeIn;display:flex;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.call-invite-card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-xl);text-align:center;box-shadow:var(--shadow-lg);width:90%;max-width:360px;padding:36px 32px;animation:.3s ease-out slideUp}.call-invite-card__icon{margin-bottom:16px;font-size:3rem;animation:1.5s ease-in-out infinite lessonBounce}.call-invite-card__title{margin-bottom:8px;font-size:1.1rem;font-weight:600}.call-invite-card__desc{color:var(--text-muted);margin-bottom:24px;font-size:.85rem}.call-invite-card__actions{justify-content:center;gap:12px;display:flex}.call-invite-card__btn{border-radius:var(--radius);cursor:pointer;border:none;padding:10px 24px;font-family:inherit;font-size:.9rem;font-weight:600;transition:all .15s}.call-invite-card__btn--accept{color:#fff;background:linear-gradient(135deg,#ff6a36,#e04d1a);box-shadow:0 2px 12px #ff5c224d}.call-invite-card__btn--accept:hover{transform:translateY(-1px);box-shadow:0 4px 20px #ff5c2266}.call-invite-card__btn--decline{background:var(--bg-tertiary);color:var(--text-muted);border:1px solid var(--border)}.call-invite-card__btn--decline:hover{background:var(--bg-elevated);color:var(--text-primary)}.guide-view{width:100%;max-width:720px;margin:0 auto;padding:32px 32px 80px;animation:.3s ease-out guideViewIn}@keyframes guideViewIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.guide-view__header{align-items:center;gap:16px;margin-bottom:32px;display:flex}.guide-view__header-icon{width:56px;height:56px;color:var(--accent);background:linear-gradient(135deg,#ff6a3626,#ff6a360d);border:1px solid #ff6a3633;border-radius:14px;flex-shrink:0;justify-content:center;align-items:center;display:flex}.guide-view__title{color:var(--text-primary);letter-spacing:-.01em;margin:0;font-size:1.35rem;font-weight:700}.guide-view__subtitle{color:var(--text-muted);margin:4px 0 0;font-size:.82rem;line-height:1.5}.guide-view__sections{flex-direction:column;gap:6px;display:flex}.guide-view__divider{align-items:center;gap:12px;margin:28px 0 16px;display:flex}.guide-view__divider-line{background:var(--border);flex:1;height:1px}.guide-view__divider-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;white-space:nowrap;font-size:.75rem;font-weight:600}.guide-section{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);transition:border-color .2s;overflow:hidden}.guide-section:hover{border-color:var(--border-strong)}.guide-section__header{width:100%;color:var(--text-primary);cursor:pointer;background:0 0;border:none;justify-content:space-between;align-items:center;padding:14px 18px;font-family:inherit;font-size:.92rem;transition:background .15s;display:flex}.guide-section__header:hover{background:var(--bg-hover)}.guide-section__header-left{align-items:center;gap:10px;display:flex}.guide-section__icon{color:var(--text-muted);align-items:center;display:flex}.guide-section__title{font-size:.9rem;font-weight:600}.guide-section__badge{color:var(--accent);letter-spacing:.02em;background:#ff6a361f;border-radius:10px;padding:2px 8px;font-size:.65rem;font-weight:600}.guide-section__chevron{color:var(--text-muted);align-items:center;transition:transform .25s;display:flex}.guide-section__chevron--open{transform:rotate(90deg)}.guide-section__body{flex-direction:column;gap:12px;padding:8px 18px 16px;animation:.25s ease-out guideSectionOpen;display:flex}@keyframes guideSectionOpen{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.guide-step{align-items:flex-start;gap:12px;display:flex}.guide-step__number{background:var(--bg-tertiary);border:1px solid var(--border);width:24px;height:24px;color:var(--text-muted);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;margin-top:1px;font-size:.7rem;font-weight:700;display:flex}.guide-step__content{flex:1;min-width:0}.guide-step__title{color:var(--text-primary);margin-bottom:3px;font-size:.85rem;font-weight:600}.guide-step__desc{color:var(--text-secondary);font-size:.8rem;line-height:1.65}.guide-view__footer{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);color:var(--text-muted);align-items:center;gap:8px;margin-top:32px;padding:14px 18px;font-size:.8rem;display:flex}.guitar-fx{border-top:1px solid var(--border-strong);background:linear-gradient(#1e1e22 0%,#18181b 100%);padding:12px 16px 8px;animation:.25s ease-out guitarFxSlideIn}@keyframes guitarFxSlideIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.guitar-fx__header{justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.guitar-fx__title{color:var(--text-primary);text-transform:uppercase;letter-spacing:.06em;align-items:center;gap:8px;font-size:.82rem;font-weight:700;display:flex}.guitar-fx__title-icon{font-size:1.1rem}.guitar-fx__close{width:28px;height:28px;color:var(--text-muted);cursor:pointer;background:#ffffff0d;border:none;border-radius:50%;justify-content:center;align-items:center;font-size:.75rem;transition:all .15s;display:flex}.guitar-fx__close:hover{color:var(--text-primary);background:#ffffff1a}.guitar-fx__presets{gap:6px;margin-bottom:10px;display:flex}.guitar-fx__preset-btn{border:1px solid var(--border);border-radius:var(--radius);color:var(--text-secondary);cursor:pointer;background:#ffffff05;flex-direction:column;flex:1;align-items:center;gap:4px;padding:8px 6px;font-family:inherit;transition:all .2s;display:flex}.guitar-fx__preset-btn:hover{border-color:var(--border-strong);background:#ffffff0f;transform:translateY(-1px)}.guitar-fx__preset-btn.active{border-color:var(--accent);color:var(--accent);background:#ff6a361f;box-shadow:0 0 12px #ff6a3626,inset 0 0 0 1px #ff6a3633}.guitar-fx__preset-icon{font-size:1.2rem}.guitar-fx__preset-label{letter-spacing:.03em;font-size:.68rem;font-weight:600}.guitar-fx__effects{grid-template-columns:repeat(3,1fr);gap:4px;display:grid}.guitar-fx__effect{border:1px solid var(--border);border-radius:var(--radius-sm);background:#ffffff05;transition:all .15s;overflow:hidden}.guitar-fx__effect.active{background:#4ade800a;border-color:#4ade804d}.guitar-fx__effect-header{align-items:center;gap:6px;padding:7px 8px;display:flex}.guitar-fx__effect-toggle{cursor:pointer;background:#ffffff0f;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:22px;height:22px;padding:0;transition:all .15s;display:flex}.guitar-fx__effect-toggle:hover{background:#ffffff1f}.guitar-fx__effect-led{background:var(--text-muted);border-radius:50%;width:8px;height:8px;transition:all .2s}.guitar-fx__effect-toggle.on .guitar-fx__effect-led{background:#4ade80;box-shadow:0 0 6px #4ade8080,0 0 12px #4ade8040}.guitar-fx__effect-name{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;flex:1;align-items:center;gap:5px;min-width:0;padding:2px 0;font-family:inherit;font-size:.72rem;font-weight:500;transition:color .15s;display:flex}.guitar-fx__effect-name:hover,.guitar-fx__effect.active .guitar-fx__effect-name{color:var(--text-primary)}.guitar-fx__effect-icon{flex-shrink:0;font-size:.85rem}.guitar-fx__effect-chevron{color:var(--text-muted);flex-shrink:0;margin-left:auto;font-size:.65rem;transition:transform .2s}.guitar-fx__effect-chevron.open{transform:rotate(180deg)}.guitar-fx__params{border-top:1px solid var(--border);flex-direction:column;gap:6px;padding:4px 8px 8px;animation:.2s ease-out guideSectionOpen;display:flex}.guitar-fx__param{align-items:center;gap:6px;display:flex}.guitar-fx__param-label{color:var(--text-muted);flex-shrink:0;min-width:42px;font-size:.65rem;font-weight:500}.guitar-fx__param-slider{appearance:none;cursor:pointer;background:#ffffff1a;border-radius:2px;outline:none;flex:1;height:3px}.guitar-fx__param-slider::-webkit-slider-thumb{-webkit-appearance:none;background:var(--accent);cursor:pointer;border:2px solid var(--bg-primary);border-radius:50%;width:12px;height:12px;transition:transform .1s}.guitar-fx__param-slider::-webkit-slider-thumb:hover{transform:scale(1.2)}.guitar-fx__param-slider::-moz-range-thumb{background:var(--accent);cursor:pointer;border:2px solid var(--bg-primary);border-radius:50%;width:12px;height:12px}.guitar-fx__param-value{color:var(--text-muted);text-align:right;font-variant-numeric:tabular-nums;min-width:32px;font-size:.62rem}.lesson-ctrl-btn--active{box-shadow:0 0 8px #ff6a3633;background:#ff6a3626!important;border-color:#ff6a3666!important}.lesson-ctrl-btn--active:hover{background:#ff6a3640!important}.guitar-fx__monitor{border-top:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:10px;margin-top:6px;padding:8px 10px;display:flex}.guitar-fx__monitor.active{border-radius:0 0 var(--radius-sm) var(--radius-sm);background:#4ade800a}.guitar-fx__monitor-btn{border:1px solid var(--border);border-radius:var(--radius);color:var(--text-muted);cursor:pointer;background:#ffffff08;flex-shrink:0;align-items:center;gap:6px;padding:5px 12px;font-family:inherit;font-size:.75rem;font-weight:600;transition:all .2s;display:flex}.guitar-fx__monitor-btn:hover{border-color:var(--border-strong);background:#ffffff14}.guitar-fx__monitor-btn.on{color:#4ade80;background:#4ade801a;border-color:#4ade8066;box-shadow:0 0 8px #4ade8026}.guitar-fx__monitor-btn.on:hover{background:#4ade802e}.guitar-fx__monitor-label{letter-spacing:.03em}.guitar-fx__monitor-vol{flex:1;align-items:center;gap:6px;min-width:100px;display:flex}.guitar-fx__monitor-warn{color:#fbbf24;flex-shrink:0;font-size:.62rem;animation:.2s ease-out guitarFxSlideIn}@media (max-width:768px){.guitar-fx__effects{grid-template-columns:repeat(2,1fr)}.guitar-fx__presets{gap:4px}.guitar-fx__preset-btn{padding:6px 4px}.guitar-fx__preset-icon{font-size:1rem}.guitar-fx__preset-label{font-size:.62rem}}@media (max-width:480px){.guitar-fx__effects{grid-template-columns:repeat(2,1fr)}.guitar-fx{padding:8px 10px 6px}}.sidebar{transition:width .25s,min-width .25s}.sidebar__collapse-btn{color:var(--text-muted);cursor:pointer;transition:all var(--transition);background:0 0;border:none;border-radius:4px;flex-shrink:0;justify-content:center;align-items:center;padding:4px;display:flex}.sidebar__collapse-btn:hover{color:var(--text-primary);background:var(--bg-hover)}.sidebar--collapsed{--sidebar-width:60px;width:60px!important;min-width:60px!important}.sidebar--collapsed .sidebar__header{flex-direction:column;align-items:center;padding:16px 8px 12px;display:flex}.sidebar--collapsed .sidebar__title{justify-content:center;gap:0;font-size:0}.sidebar--collapsed .sidebar__title svg{font-size:inherit}.sidebar--collapsed .sidebar__search,.sidebar--collapsed .sidebar__label{display:none}.sidebar--collapsed .room-item{justify-content:center;gap:0;padding:6px}.sidebar--collapsed .room-item__info,.sidebar--collapsed .room-item__meta{display:none}.sidebar--collapsed .add-room-btn{justify-content:center;gap:0;margin:4px 6px;padding:6px;font-size:0}.sidebar--collapsed .add-room-btn svg{margin:0}.sidebar--collapsed .sidebar__profile{flex-direction:column;gap:6px;padding:10px 8px}.sidebar--collapsed .sidebar__profile-info{display:none}.sidebar--collapsed .logout-btn{padding:4px}.channel-panel{transition:width .25s,min-width .25s}.channel-panel__collapse-btn{color:var(--text-muted);cursor:pointer;transition:all var(--transition);background:0 0;border:none;border-radius:4px;flex-shrink:0;justify-content:center;align-items:center;padding:4px;display:flex}.channel-panel__collapse-btn:hover{color:var(--text-primary);background:var(--bg-hover)}.channel-panel--collapsed{--channel-width:60px;width:60px!important;min-width:60px!important}.channel-panel--collapsed .channel-panel__header{flex-direction:column;align-items:center;padding:16px 8px 12px;display:flex}.channel-panel--collapsed .channel-panel__room-name{justify-content:center;gap:0;font-size:0}.channel-panel--collapsed .channel-panel__room-name svg{font-size:inherit}.channel-panel--collapsed .channel-panel__sub,.channel-panel--collapsed .channel-list__label{display:none}.channel-panel--collapsed .channel-item{justify-content:center;gap:0;padding:8px}.channel-panel--collapsed .channel-item__name,.channel-panel--collapsed .channel-item__unread{display:none}.channel-panel--collapsed .call-active-indicator{flex-direction:column;gap:4px;padding:8px}.channel-panel--collapsed .call-active-indicator__text{display:none}.channel-panel--collapsed .lesson-btn{gap:0;padding:10px;font-size:0}.channel-panel--collapsed .lesson-btn svg{font-size:inherit}.channel-panel--collapsed .sidebar__profile{flex-direction:column;gap:6px;padding:10px 8px}.channel-panel--collapsed .sidebar__profile-info{display:none}.channel-panel--collapsed .sidebar__profile .logout-btn{padding:4px}.channel-panel--collapsed .channel-panel__bottom-links{padding:0 4px}.split-view{flex:1;min-width:0;height:100%;min-height:0;display:flex;overflow:hidden}.split-view__content{border-right:1px solid var(--border);background:var(--bg-chat);flex-direction:column;width:50%;min-width:0;display:flex}.split-view__call{cursor:pointer;flex-direction:column;width:50%;min-width:0;height:100%;min-height:0;display:flex;position:relative;overflow:hidden}.split-view__call-overlay{z-index:5;pointer-events:none;background:0 0;justify-content:center;align-items:center;transition:background .2s;display:flex;position:absolute;inset:0}.split-view__call:hover .split-view__call-overlay{background:#00000059}.split-view__expand-hint{opacity:0;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:var(--radius);color:#fff;pointer-events:none;background:#ffffff1f;align-items:center;gap:8px;padding:10px 20px;font-size:.85rem;font-weight:500;transition:opacity .2s;display:flex}.split-view__call:hover .split-view__expand-hint{opacity:1}.lesson-view--compact .lesson-join{gap:12px;padding:20px}.lesson-view--compact .lesson-join__icon{font-size:2rem}.lesson-view--compact .lesson-join__title{font-size:1.1rem}.lesson-view--compact .lesson-subtitle,.lesson-view--compact .guitar-fx{display:none}.lesson-view--compact .lesson-controls{gap:8px;padding:6px 10px}.lesson-view--compact .lesson-controls__status{gap:1px}.lesson-view--compact .lesson-status-badge{font-size:.68rem}.lesson-view--compact .lesson-translation-badge{padding:1px 6px;font-size:.62rem}.lesson-view--compact .lesson-controls__levels{min-width:60px}.lesson-view--compact .lesson-level__name{min-width:40px;max-width:50px;font-size:.62rem}.lesson-view--compact .lesson-level__bar{height:3px}.lesson-view--compact .lesson-volume-inline{display:none}.lesson-view--compact .lesson-ctrl-btn{width:36px;height:36px;font-size:.95rem}.lesson-view--compact .lesson-video-local{width:100px;height:75px;bottom:8px;right:8px}.lesson-view--compact .lesson-waiting-rings{width:50px;height:50px;font-size:1.5rem}.lesson-view--compact .lesson-error{padding:6px 12px;font-size:.75rem}@media (max-width:768px){.sidebar__collapse-btn,.channel-panel__collapse-btn{display:none}.split-view{flex-direction:column}.split-view__content,.split-view__call{width:100%;height:50%}}