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.gradient-text{background:linear-gradient(135deg,#fff,#fffc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.dashboard-hero__subtitle{font-size:1.1rem;color:#ffffffd9;margin:8px 0 0}.dashboard-hero__stats{display:flex;gap:20px;flex-wrap:wrap}.dashboard-stat-card{display:flex;align-items:center;gap:16px;padding:20px 24px;background:#ffffff26;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);border-radius:16px;min-width:180px;transition:all .3s ease}.dashboard-stat-card:hover{background:#fff3;transform:translateY(-2px)}.dashboard-stat-card__icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center}.dashboard-stat-card__icon 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var(--border);border-radius:20px}.dashboard-empty__icon{width:80px;height:80px;border-radius:20px;background:linear-gradient(135deg,#1a73e81a,#6366f11a);display:flex;align-items:center;justify-content:center;margin-bottom:24px}.dashboard-empty__icon svg{width:40px;height:40px;color:var(--accent)}.dashboard-empty__title{font-size:1.35rem;font-weight:600;color:var(--text);margin:0 0 8px}.dashboard-empty__text{font-size:1rem;color:var(--text-muted);margin:0 0 24px;max-width:400px}.dashboard-empty__btn{display:flex;align-items:center;gap:10px;padding:14px 28px;background:linear-gradient(135deg,var(--accent) 0%,#6366f1 100%);color:#fff;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;box-shadow:0 4px 14px #1a73e859;transition:all .3s ease}.dashboard-empty__btn svg{width:20px;height:20px}.dashboard-empty__btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #1a73e873}.dashboard-modal{max-width:440px;border-radius:20px}.dashboard-modal__icon{width:64px;height:64px;margin:32px auto 0;border-radius:16px;background:linear-gradient(135deg,var(--accent) 0%,#6366f1 100%);display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px #1a73e84d}.dashboard-modal__icon svg{width:32px;height:32px;color:#fff}.classroom-card{background:var(--bg-alt);border:1px solid var(--border);border-radius:16px;overflow:hidden;box-shadow:0 2px 8px #0000000a;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;flex-direction:column}.classroom-card:hover{transform:translateY(-4px);box-shadow:0 12px 24px #0000001a}.classroom-card__header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:24px;background:var(--card-accent, var(--accent));position:relative}.classroom-card__header:before{content:"";position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' 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svg{width:18px;height:18px;color:#fff}.classroom-card__delete:hover{background:#ea4335e6;border:2px solid white;padding:8px}.classroom-card__body{flex:1;padding:24px;display:flex;align-items:center;justify-content:center}.classroom-card__icon{width:64px;height:64px;border-radius:16px;background:linear-gradient(135deg,#1a73e81a,#6366f11a);display:flex;align-items:center;justify-content:center}.classroom-card__icon svg{width:32px;height:32px;color:var(--card-accent, var(--accent))}.classroom-card__footer{padding:16px 24px;border-top:1px solid var(--border);background:var(--bg)}.classroom-card__action{display:flex;align-items:center;justify-content:center;gap:8px;padding:12px;background:var(--bg-alt);border:1px solid var(--border);border-radius:10px;font-size:.9rem;font-weight:600;color:var(--accent);text-decoration:none;transition:all .2s ease}.classroom-card__action svg{width:18px;height:18px;transition:transform .2s ease}.classroom-card__action:hover{background:linear-gradient(135deg,var(--accent) 0%,#6366f1 100%);border-color:transparent;color:#fff}.classroom-card__action:hover svg{transform:translate(4px)}@media(max-width:1024px){.navbar__user-info{display:none}.dashboard-hero__stats{flex-direction:column}.dashboard-stat-card{width:100%}}@media(max-width:768px){.navbar__container{padding:0 20px;gap:16px}.navbar__nav{display:none}.navbar__title{font-size:1.15rem}.navbar__logout span{display:none}.navbar__logout{padding:10px}.dashboard-hero{padding:32px 20px}.dashboard-hero__title{font-size:1.75rem}.dashboard-hero__wave{font-size:2rem}.dashboard-main{padding:24px 20px}.dashboard-section__header{flex-direction:column;align-items:stretch}.dashboard-create-btn{justify-content:center}.dashboard-grid{grid-template-columns:1fr}}@media(max-width:480px){.navbar__user{padding:6px}.dashboard-hero__subtitle{font-size:.95rem}}.classroom-page{min-height:100vh;background:var(--bg)}.classroom-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;gap:16px}.classroom-loading__spinner{width:48px;height:48px;border:4px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}.classroom-loading 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#1a73e84d}.classroom-empty__btn svg{width:18px;height:18px}.lecture-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px}.lecture-card{background:var(--bg-alt);border-radius:16px;box-shadow:var(--shadow-card);overflow:hidden;transition:all .3s ease}.lecture-card:hover{transform:translateY(-4px);box-shadow:0 12px 40px #0000001f}.lecture-card__header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;background:linear-gradient(135deg,#1a73e80d,#6366f105);border-bottom:1px solid var(--border)}.lecture-card__number{font-size:1.25rem;font-weight:700;color:var(--accent)}.lecture-card__status{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:var(--bg-hover);border-radius:50px;font-size:.8rem;font-weight:500;color:var(--text-muted)}.lecture-card__status--active{background:#34a8531a;color:#34a853}.lecture-card__status-dot{width:8px;height:8px;background:#34a853;border-radius:50%;animation:pulse 2s ease-in-out 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var(--accent));color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.25rem;font-weight:600;flex-shrink:0}.student-card__info{flex:1;min-width:0}.student-card__name{font-size:1rem;font-weight:600;color:var(--text);margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.student-card__email{font-size:.85rem;color:var(--text-muted);margin:2px 0 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.student-card__roll{display:inline-block;font-size:.75rem;color:var(--accent);background:#1a73e81a;padding:2px 8px;border-radius:4px;margin-top:4px}.student-card__remove{width:36px;height:36px;border-radius:8px;background:none;border:none;color:var(--text-muted);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s ease;flex-shrink:0}.student-card__remove:hover{background:#ea43351a;color:var(--danger)}.student-card__remove svg{width:18px;height:18px}.invite-modal{width:100%;max-width:500px;background:var(--bg-alt);border-radius:24px;padding:32px;position:relative;animation:modalSlideIn .3s ease}@keyframes modalSlideIn{0%{opacity:0;transform:translateY(20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.invite-modal__icon{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,#1a73e826,#6366f11a);display:flex;align-items:center;justify-content:center;margin:0 auto 20px}.invite-modal__icon svg{width:32px;height:32px;color:var(--accent)}.invite-modal__header{text-align:center;margin-bottom:24px}.invite-modal__header h2{font-size:1.5rem;font-weight:600;color:var(--text);margin:0 0 8px}.invite-modal__header p{color:var(--text-muted);font-size:.95rem;margin:0}.invite-modal__close{position:absolute;top:20px;right:20px;width:36px;height:36px;border-radius:10px;background:none;border:none;color:var(--text-muted);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s ease}.invite-modal__close:hover{background:var(--bg-hover);color:var(--text)}.invite-modal__close svg{width:20px;height:20px}.invite-modal__form{display:flex;flex-direction:column;gap:16px}.invite-modal__upload{border:2px dashed var(--border);border-radius:16px;overflow:hidden;transition:all .3s ease}.invite-modal__upload:hover{border-color:var(--accent);background:#1a73e805}.invite-modal__upload-label{display:flex;flex-direction:column;align-items:center;padding:24px;cursor:pointer;text-align:center}.invite-modal__upload-label svg{width:40px;height:40px;color:var(--accent);margin-bottom:12px}.invite-modal__upload-text{font-weight:500;color:var(--accent);margin-bottom:4px}.invite-modal__upload-hint{font-size:.85rem;color:var(--text-muted)}.invite-modal__divider{display:flex;align-items:center;gap:16px;color:var(--text-muted);font-size:.85rem}.invite-modal__divider:before,.invite-modal__divider:after{content:"";flex:1;height:1px;background:var(--border)}.invite-modal__textarea{width:100%;padding:16px;border:2px solid var(--border);border-radius:12px;background:var(--bg);color:var(--text);font-size:.95rem;resize:vertical;min-height:120px;transition:all .3s ease;box-sizing:border-box}.invite-modal__textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px #1a73e81a}.invite-modal__textarea::placeholder{color:var(--text-muted)}.invite-modal__result{padding:16px;border-radius:12px;font-size:.9rem}.invite-modal__result--error{background:#ea43351a;border:1px solid rgba(234,67,53,.3);display:flex;align-items:center;gap:10px;color:var(--danger)}.invite-modal__result--error svg{width:20px;height:20px;flex-shrink:0}.invite-modal__result--success{background:#34a8531a;border:1px solid rgba(52,168,83,.3)}.invite-modal__result-details{display:flex;flex-direction:column;gap:8px}.invite-modal__result-item{display:flex;align-items:center;gap:8px}.invite-modal__result-item svg{width:18px;height:18px;flex-shrink:0}.invite-modal__result-item--success{color:#34a853}.invite-modal__result-item--warning{color:#ea8600}.invite-modal__result-item--info{color:var(--text-muted)}.invite-modal__actions{display:flex;gap:12px;justify-content:flex-end;margin-top:8px}.invite-modal__cancel{padding:12px 24px;background:var(--bg-hover);border:none;border-radius:12px;font-size:.95rem;font-weight:500;color:var(--text);cursor:pointer;transition:all .3s ease}.invite-modal__cancel:hover{background:var(--border)}.invite-modal__submit{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;background:linear-gradient(135deg,#1a73e8,#6366f1);border:none;border-radius:12px;font-size:.95rem;font-weight:500;color:#fff;cursor:pointer;transition:all .3s ease}.invite-modal__submit:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 25px #1a73e84d}.invite-modal__submit:disabled{opacity:.6;cursor:not-allowed}.invite-modal__submit svg{width:18px;height:18px}.invite-modal__spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite}@media(max-width:768px){.classroom-header{padding:90px 16px 24px}.classroom-header__main{flex-direction:column;align-items:stretch}.classroom-header__title{font-size:1.5rem}.classroom-header__stats{justify-content:center}.classroom-header__stat{flex:1;min-width:auto}.classroom-tabs__container{padding:0 16px}.classroom-tab{padding:12px 16px;font-size:.9rem}.classroom-content{padding:24px 16px}.classroom-section__header{flex-direction:column}.classroom-action-btn{width:100%;justify-content:center}.lecture-grid,.students-grid{grid-template-columns:1fr}.invite-modal{margin:16px;padding:24px;border-radius:20px}}@media(max-width:480px){.classroom-header__meta{flex-direction:column;gap:8px}.classroom-header__meta-item{justify-content:center}.classroom-tab span{display:none}.classroom-tab svg{width:22px;height:22px}}.lecture-page{min-height:100vh;background:var(--bg)}.lecture-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;gap:16px}.lecture-loading__spinner{width:48px;height:48px;border:4px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}.lecture-loading p{color:var(--text-muted);font-size:1rem}.lecture-header{position:relative;background:linear-gradient(135deg,#1a73e8,#6366f1,#8b5cf6);padding:20px 24px 40px;overflow:hidden}.lecture-header__bg{position:absolute;inset:0;overflow:hidden;pointer-events:none}.lecture-header__shape{position:absolute;border-radius:50%;background:#ffffff14}.lecture-header__shape--1{width:400px;height:400px;top:-150px;right:-100px;animation:float 10s ease-in-out infinite}.lecture-header__shape--2{width:250px;height:250px;bottom:-100px;left:5%;animation:float 12s ease-in-out infinite reverse}.lecture-header__pattern{position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.1) 1px,transparent 1px);background-size:30px 30px;opacity:.5}.lecture-header__content{position:relative;max-width:1200px;margin:0 auto}.lecture-header__back{display:inline-flex;align-items:center;gap:8px;color:#ffffffd9;text-decoration:none;font-size:.9rem;font-weight:500;margin-bottom:24px;padding:10px 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rgba(0,0,0,.15);line-height:1.2}.lecture-header__meta{display:flex;gap:16px;flex-wrap:wrap}.lecture-header__meta-item{display:flex;align-items:center;gap:8px;color:#ffffffe6;font-size:.95rem;background:#ffffff1f;padding:10px 18px;border-radius:50px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.lecture-header__meta-item svg{width:18px;height:18px;opacity:.85}.lecture-header__meta-item strong{font-family:Fira Code,Monaco,monospace;font-weight:600}.lecture-header__controls{display:flex;flex-direction:column;align-items:flex-end;gap:16px}.lecture-status{display:flex;align-items:center;gap:10px;padding:12px 20px;border-radius:50px;font-size:.9rem;font-weight:600;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.lecture-status--active{background:#34a85340;color:#a7f3d0}.lecture-status--closed{background:#ffffff26;color:#fffc}.lecture-status__dot{width:10px;height:10px;border-radius:50%;background:currentColor}.lecture-status--active 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#ef444466}.lecture-control-btn--disabled{opacity:.5;cursor:not-allowed;transform:none!important}.lecture-header__stats{display:flex;gap:20px;flex-wrap:wrap}.lecture-stat{display:flex;align-items:center;gap:16px;background:#ffffff1f;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:16px 24px;border-radius:16px;min-width:160px}.lecture-stat__icon{width:48px;height:48px;border-radius:12px;background:#34a85333;display:flex;align-items:center;justify-content:center}.lecture-stat__icon svg{width:24px;height:24px;color:#86efac}.lecture-stat__icon--purple{background:#8b5cf640}.lecture-stat__icon--purple svg{color:#c4b5fd}.lecture-stat__content{display:flex;flex-direction:column}.lecture-stat__number{font-size:1.75rem;font-weight:700;color:#fff;line-height:1.2}.lecture-stat__label{font-size:.85rem;color:#ffffffbf}.lecture-content{max-width:1200px;margin:0 auto;padding:32px 24px 64px}.lecture-section__header{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:24px;flex-wrap:wrap}.lecture-section__title-group{flex:1}.lecture-section__title{font-size:1.5rem;font-weight:600;color:var(--text);margin:0}.lecture-section__subtitle{color:var(--text-muted);font-size:.95rem;margin:4px 0 0}.lecture-export-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;background:var(--bg-alt);border:2px solid var(--border);border-radius:12px;font-size:.95rem;font-weight:500;color:var(--text);cursor:pointer;transition:all .3s ease}.lecture-export-btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent);background:#1a73e80d}.lecture-export-btn:disabled{opacity:.5;cursor:not-allowed}.lecture-export-btn svg{width:18px;height:18px}.lecture-empty{display:flex;flex-direction:column;align-items:center;text-align:center;padding:80px 24px;background:var(--bg-alt);border-radius:24px;border:2px dashed var(--border)}.lecture-empty__icon{width:88px;height:88px;border-radius:50%;background:linear-gradient(135deg,#1a73e81a,#6366f10d);display:flex;align-items:center;justify-content:center;margin-bottom:24px}.lecture-empty__icon svg{width:44px;height:44px;color:var(--accent)}.lecture-empty__title{font-size:1.35rem;font-weight:600;color:var(--text);margin:0 0 10px}.lecture-empty__text{color:var(--text-muted);margin:0 0 28px;max-width:360px;line-height:1.6}.lecture-empty__btn{display:inline-flex;align-items:center;gap:10px;padding:14px 28px;background:linear-gradient(135deg,#1a73e8,#6366f1);color:#fff;border:none;border-radius:14px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 20px #1a73e84d}.lecture-empty__btn:hover{transform:translateY(-3px);box-shadow:0 8px 30px #1a73e866}.lecture-empty__btn svg{width:20px;height:20px}.lecture-empty__waiting{display:flex;align-items:center;gap:12px;padding:14px 24px;background:#34a8531a;border-radius:50px;color:#059669;font-weight:500}.lecture-empty__pulse{width:12px;height:12px;background:#34d399;border-radius:50%;animation:pulse 2s ease-in-out infinite}.attendance-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}.attendance-card{display:flex;align-items:center;gap:16px;padding:20px;background:var(--bg-alt);border-radius:16px;box-shadow:var(--shadow-card);transition:all .3s ease}.attendance-card:hover{transform:translateY(-3px);box-shadow:0 12px 35px #0000001a}.attendance-card__avatar{width:52px;height:52px;border-radius:14px;background:var(--avatar-color, var(--accent));color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.35rem;font-weight:600;flex-shrink:0}.attendance-card__info{flex:1;min-width:0}.attendance-card__name{font-size:1.05rem;font-weight:600;color:var(--text);margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.attendance-card__email{font-size:.85rem;color:var(--text-muted);margin:3px 0 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.attendance-card__roll{display:inline-block;font-size:.75rem;color:var(--accent);background:#1a73e81a;padding:3px 10px;border-radius:6px;margin-top:6px;font-weight:500}.attendance-card__badge{display:flex;align-items:center;gap:6px;padding:8px 14px;background:#34a8531a;border-radius:50px;color:#059669;font-size:.8rem;font-weight:600;flex-shrink:0}.attendance-card__badge svg{width:16px;height:16px}@media(max-width:768px){.lecture-header{padding:90px 16px 32px}.lecture-header__main{flex-direction:column;align-items:stretch}.lecture-header__title{font-size:1.75rem}.lecture-header__controls{align-items:stretch}.lecture-status,.lecture-header__buttons,.lecture-header__stats{justify-content:center}.lecture-stat{flex:1;min-width:140px;justify-content:center}.lecture-content{padding:24px 16px 48px}.lecture-section__header{flex-direction:column}.lecture-export-btn{width:100%;justify-content:center}.attendance-grid{grid-template-columns:1fr}}@media(max-width:480px){.lecture-header__meta{flex-direction:column;gap:10px}.lecture-header__meta-item{justify-content:center}.lecture-control-btn{flex:1;justify-content:center;padding:12px 16px}.lecture-stat{padding:14px 18px}.lecture-stat__number{font-size:1.5rem}.attendance-card{flex-wrap:wrap}.attendance-card__badge{width:100%;justify-content:center;margin-top:8px}}.qr-page{min-height:100vh;background:linear-gradient(135deg,#0f0f23,#1a1a2e,#16213e);position:relative;overflow:hidden}.qr-page__bg{position:absolute;inset:0;overflow:hidden;pointer-events:none}.qr-page__shape{position:absolute;border-radius:50%;filter:blur(80px)}.qr-page__shape--1{width:500px;height:500px;background:#1a73e826;top:-200px;right:-100px;animation:float 15s ease-in-out infinite}.qr-page__shape--2{width:400px;height:400px;background:#6366f11f;bottom:-150px;left:-100px;animation:float 18s ease-in-out infinite reverse}.qr-page__shape--3{width:300px;height:300px;background:#8b5cf61a;top:50%;left:50%;transform:translate(-50%,-50%);animation:pulse 8s ease-in-out infinite}.qr-page__content{position:relative;min-height:100vh;display:flex;flex-direction:column;padding:24px}.qr-page__header{display:flex;justify-content:space-between;align-items:center;margin:0 20px;padding-bottom:24px}.qr-page__brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:1.25rem;font-weight:600}.qr-page__brand svg{width:28px;height:28px;color:#8ab4f8}.qr-page__status{display:flex;align-items:center;gap:10px;padding:10px 20px;border-radius:50px;font-size:.9rem;font-weight:600}.qr-page__status--live{background:#34d39926;color:#34d399;border:1px solid rgba(52,211,153,.3)}.qr-page__status--stopped{background:#ef444426;color:#f87171;border:1px solid rgba(239,68,68,.3)}.qr-page__status-dot{width:10px;height:10px;border-radius:50%;background:currentColor}.qr-page__status--live .qr-page__status-dot{animation:pulse 2s ease-in-out infinite}.qr-page__main{flex:1;display:flex;align-items:center;justify-content:center;width:100%;max-width:1400px;margin:0 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