:root{--primary-color: #6366f1;--primary-hover: #4f46e5;--secondary-color: #0ea5e9;--accent-color: #f97316;--bg-color: #0f172a;--card-bg: rgba(15, 23, 42, .65);--text-main: #f8fafc;--text-muted: #cbd5f5;--border-color: rgba(255, 255, 255, .125);--danger-color: #f87171;--success-color: #34d399;--spacing-xs: .5rem;--spacing-sm: 1rem;--spacing-md: 1.5rem;--spacing-lg: 2rem;--spacing-xl: 3rem;--touch-target: 44px;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: 1rem;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,sans-serif;background:radial-gradient(circle at 10% 20%,rgba(99,102,241,.45),transparent 50%),radial-gradient(circle at 90% 10%,rgba(14,165,233,.35),transparent 55%),radial-gradient(circle at 20% 80%,rgba(249,115,22,.25),transparent 45%),var(--bg-color);color:var(--text-main);line-height:1.5;min-height:100vh;overflow-x:hidden}.glass-panel{background:var(--card-bg);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:0 25px 50px -12px #0f172a73;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}.landing-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:var(--spacing-lg);text-align:center;max-width:1100px;margin:0 auto}.app-container{max-width:1200px;margin:0 auto;padding:var(--spacing-lg)}.app-container>main{background:#0f172a52;border-radius:var(--radius-lg);border:1px solid rgba(255,255,255,.04);padding:var(--spacing-lg);box-shadow:none}.app-container>main .card{background:#0f172a7a}.app-container>main,.landing-container,.card{position:relative}.app-container:before,.landing-container:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border-radius:var(--radius-lg);background:#ffffff0d;pointer-events:none;filter:blur(35px);opacity:.18}.landing-header h1{font-size:3.25rem;color:#fff;margin-bottom:var(--spacing-sm);text-shadow:0 10px 30px rgba(0,0,0,.35)}.app-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-md);border-bottom:1px solid rgba(255,255,255,.08)}.header-left h1{font-size:1.5rem;font-weight:600}.back-link{text-decoration:none;color:var(--text-muted);font-size:.875rem;margin-bottom:var(--spacing-xs);display:block}.back-link:hover{color:var(--primary-color)}.teacher-app-header{display:grid;grid-template-columns:minmax(0,1fr) max-content;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-sm);padding-bottom:var(--spacing-sm)}.teacher-app-header .header-actions{justify-self:end;min-width:max-content}.teacher-auth-controls{display:flex;align-items:center;gap:.5rem}.student-app-header{display:grid;grid-template-columns:minmax(180px,max-content) minmax(0,1fr) max-content;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-sm);padding-bottom:var(--spacing-sm)}.student-app-header .header-left{min-width:0}.student-app-header .header-left h1{font-size:1.35rem;line-height:1.15}.student-app-header .header-actions{justify-self:end;min-width:max-content}.student-tab-shell{justify-self:center}.student-mobile-profile-btn{display:none}.app-container>.teacher-main{padding:var(--spacing-md)}.card{background:var(--card-bg);border-radius:var(--radius-lg);padding:var(--spacing-lg);border:1px solid var(--border-color);transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;box-shadow:0 14px 30px -22px #0f172ab3}.option-card{display:flex;flex-direction:column;align-items:center;text-decoration:none;color:var(--text-main);width:min(100%,320px);min-height:220px;cursor:pointer}.option-card:hover{transform:translateY(-6px) scale(1.01);border-color:#fff6;box-shadow:0 20px 45px -20px #0f172abf}.activity-card{position:relative}.progress-badge{position:absolute;top:.5rem;right:.5rem;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;padding:.25rem .5rem;border-radius:999px;font-size:.75rem;font-weight:600;box-shadow:0 2px 8px #6366f166}.progress-badge.complete{background:linear-gradient(135deg,#10b981,#059669);box-shadow:0 2px 8px #10b98166}.coverage-badge,.plays-badge{position:absolute;bottom:.5rem;font-size:.7rem;color:var(--text-muted);background:#0000004d;padding:.2rem .4rem;border-radius:4px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.coverage-badge{left:.5rem}.plays-badge{right:.5rem}#activity-menu-view .activities-grid{display:block}#activity-menu-view .section-header{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"back export" "title export";align-items:start;max-width:1000px;margin:0 auto 1.25rem;gap:.35rem 1.25rem}#activity-menu-view #back-to-vocab{grid-area:back;justify-self:start;min-height:2.25rem;padding-left:0;padding-right:0}#activity-menu-view .activity-menu-title-block{grid-area:title;min-width:0}#activity-menu-view .student-export-menu{grid-area:export;justify-self:end}#activity-menu-view .section-header h2{max-width:760px;margin-top:.15rem;line-height:1.15}#activity-menu-view .required-activities-status{max-width:1000px;margin:0 auto 1rem}#activity-menu-view .activity-menu-summary{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) minmax(0,1fr);gap:.75rem}#activity-menu-view .activity-menu-summary-card{display:grid;align-content:start;min-height:86px;gap:.2rem;padding:.8rem .9rem;border:1px solid rgba(148,163,184,.18);border-radius:var(--radius-md);background:#0f172a6b}#activity-menu-view .activity-menu-summary-card.is-next{border-color:#60a5fa73;background:#3b82f61f}#activity-menu-view .activity-menu-summary-label{color:var(--text-muted);font-size:.72rem;font-weight:900;line-height:1.1;text-transform:uppercase}#activity-menu-view .activity-menu-summary-card strong{color:#fff;font-size:1.05rem;line-height:1.2;overflow-wrap:anywhere}#activity-menu-view .activity-menu-summary-card small{color:var(--text-muted);font-size:.78rem;font-weight:700;line-height:1.25}#activity-menu-view .activity-menu-summary-meter{width:100%;height:6px;margin-top:.25rem;overflow:hidden;border-radius:999px;background:#94a3b833}#activity-menu-view .activity-menu-summary-meter div{height:100%;border-radius:inherit;background:var(--primary-color, #6366f1);transition:width .3s ease}#activity-menu-view .activity-flow-section{max-width:1000px;margin:0 auto 1rem}#activity-menu-view .activity-flow-section h3{margin:0 0 .65rem;color:var(--text-main);font-size:1rem}#activity-menu-view .activity-flow-section .activities-grid-inner{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.75rem}#activity-menu-view .activity-card{min-height:132px;padding:.95rem;gap:.45rem}#activity-menu-view .activity-card .icon{font-size:2rem}#activity-menu-view .activity-card h3{font-size:1rem}#activity-menu-view .activity-card p{margin:0;color:var(--text-muted);font-size:.88rem;line-height:1.35}#activity-menu-view .activity-secondary-grid .activity-card p{display:none}#activity-menu-view .progress-badge{position:static;align-self:flex-start;margin-top:auto;background:#6366f12e;color:#c7d2fe;box-shadow:none}#activity-menu-view .progress-badge.complete{background:#10b9812e;color:#86efac;box-shadow:none}#activity-menu-view .next-activity-card{border-color:#60a5fab8;background:#3b82f61f;box-shadow:0 16px 34px -28px #60a5fae6}#activity-menu-view .next-activity-label{display:inline-flex;align-items:center;align-self:flex-start;min-height:1.55rem;padding:.15rem .5rem;border-radius:999px;background:#60a5fa2e;color:#bfdbfe;font-size:.72rem;font-weight:900;text-transform:uppercase}#activity-menu-view .activity-lock-label,#activity-menu-view .activity-unavailable-label{display:inline-flex;align-items:center;align-self:flex-start;min-height:1.55rem;padding:.15rem .5rem;border-radius:999px;font-size:.72rem;font-weight:900;text-transform:uppercase}#activity-menu-view .activity-lock-label{background:#94a3b824;color:#cbd5e1}#activity-menu-view .activity-unavailable-label{background:#64748b29;color:#94a3b8}#activity-menu-view .activity-locked-card,#activity-menu-view .activity-unavailable-card{border-color:#64748b38;background:#0f172a7a;box-shadow:none}#activity-menu-view .activity-locked-card .icon,#activity-menu-view .activity-unavailable-card .icon,#activity-menu-view .activity-locked-card h3,#activity-menu-view .activity-unavailable-card h3,#activity-menu-view .activity-locked-card p,#activity-menu-view .activity-unavailable-card p{opacity:.62}#activity-menu-view .activity-unavailable-card{cursor:not-allowed}#activity-menu-view .activity-unavailable-card:hover{border-color:#64748b38;transform:none;box-shadow:none}#activity-menu-view .activity-secondary-disclosure{border-top:1px solid rgba(148,163,184,.18);padding-top:.35rem}#activity-menu-view .activity-secondary-disclosure summary{display:inline-flex;align-items:center;min-height:var(--touch-target);border-radius:var(--radius-sm);color:var(--text-main);font-weight:900;cursor:pointer}#activity-menu-view .activity-secondary-disclosure:not([open]){margin-bottom:.25rem}#activity-menu-view .activity-secondary-disclosure:not([open]) summary{color:var(--text-muted)}#activity-menu-view .activity-secondary-disclosure summary:hover{color:#bfdbfe}#activity-menu-view .activity-secondary-disclosure summary:focus-visible{outline:3px solid rgba(14,165,233,.8);outline-offset:3px}#activity-menu-view .activity-disclosure-note{margin:0 0 .75rem;color:var(--text-muted);font-size:.88rem;line-height:1.4}#activity-menu-view .activity-detail-list{display:grid;gap:0}#activity-menu-view .activity-detail-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:.75rem;padding:.65rem 0;border-top:1px solid rgba(148,163,184,.14)}#activity-menu-view .activity-detail-copy strong,#activity-menu-view .activity-detail-copy span{display:block;min-width:0;overflow-wrap:anywhere}#activity-menu-view .activity-detail-copy span{margin-top:.15rem;color:var(--text-muted);font-size:.86rem}#activity-menu-view .activity-detail-meta{display:flex;align-items:flex-end;flex-direction:column;gap:.25rem;color:var(--text-muted);font-size:.78rem;font-weight:800;text-align:right}.completion-screen{text-align:center;padding:2rem}.completion-screen h2{font-size:1.75rem;margin-bottom:1rem}.completion-screen p{color:var(--text-muted);margin-bottom:.5rem}.completion-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000c;display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.completion-overlay .completion-screen{background:var(--card-bg);padding:2rem;border-radius:1rem;border:1px solid var(--border-color);box-shadow:0 25px 50px -12px #00000080;animation:scaleIn .3s ease}@keyframes scaleIn{0%{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}.overall-coverage{display:flex;align-items:center;gap:.5rem;font-size:.85rem;color:var(--text-muted)}.option-card .icon{font-size:3.25rem;margin-bottom:var(--spacing-sm);filter:drop-shadow(0 10px 25px rgba(15,23,42,.55))}.landing-options{display:flex;flex-wrap:wrap;justify-content:center;gap:var(--spacing-md);width:100%}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;padding:.6rem 1.25rem;min-height:var(--touch-target);min-width:var(--touch-target);border-radius:999px;font-weight:600;cursor:pointer;border:none;transition:transform .2s ease,box-shadow .2s ease;font-size:1rem;line-height:1.2;touch-action:manipulation}.runtime-pill{display:inline-flex;align-items:center;min-height:1.5rem;padding:.15rem .5rem;border:1px solid var(--border-color);border-radius:999px;color:var(--text-muted);font-size:.75rem;line-height:1;white-space:nowrap}.runtime-pill[data-state=online]{border-color:#22c55e59;color:var(--success-color)}.runtime-pill[data-state=offline]{border-color:#fbbf2473;color:#fbbf24}.status-dot{display:inline-flex;align-items:center;justify-content:center;width:.85rem;height:.85rem;border-radius:999px;background:var(--text-muted);box-shadow:0 0 0 4px #94a3b824}.status-dot[data-state=synced]{background:var(--success-color);box-shadow:0 0 0 4px #10b98129}.status-dot[data-state=pending]{background:#fbbf24;box-shadow:0 0 0 4px #fbbf2429}.status-dot[data-state=offline],.status-dot[data-state=error]{background:var(--danger-color);box-shadow:0 0 0 4px #f8717129}.btn:disabled{cursor:not-allowed;opacity:.55;transform:none;box-shadow:none}.btn:disabled:hover{transform:none;box-shadow:none}.primary-btn{background:linear-gradient(120deg,var(--primary-color),var(--secondary-color));color:#fff;box-shadow:0 10px 25px -10px #6366f1cc}.primary-btn:hover{transform:translateY(-2px);box-shadow:0 15px 35px -12px #6366f1e6}.secondary-btn{background-color:transparent;border:1px solid rgba(255,255,255,.35);color:var(--text-main)}.secondary-btn:hover{transform:translateY(-2px);border-color:#ffffffa6}.accent-btn{background:linear-gradient(120deg,var(--accent-color),#fb923c);color:#fff;box-shadow:0 10px 25px -10px #f97316cc}.student-export-menu{position:relative;z-index:5}.student-export-menu summary{list-style:none}.student-export-menu summary::-webkit-details-marker{display:none}.student-export-menu[open] summary{transform:translateY(-2px);box-shadow:0 15px 35px -12px #f97316e6}.student-export-menu-panel{position:absolute;top:calc(100% + .5rem);right:0;display:grid;width:max-content;min-width:220px;gap:.25rem;padding:.4rem;border:1px solid rgba(148,163,184,.28);border-radius:var(--radius-md);background:#0f172af5;box-shadow:0 24px 48px -24px #0f172af2}.student-export-menu-item{display:flex;align-items:center;gap:.55rem;min-height:var(--touch-target);width:100%;padding:.65rem .8rem;border:0;border-radius:var(--radius-sm);background:transparent;color:var(--text-main);font:inherit;font-weight:800;text-align:left;cursor:pointer}.student-export-menu-item:hover,.student-export-menu-item:focus-visible{background:#ffffff14;outline:none}.student-export-menu-item svg{width:1rem;height:1rem;flex:0 0 auto;color:#fed7aa}.danger-btn{background:#ef444429;border:1px solid rgba(248,113,113,.55);color:#fecaca}.text-btn{background:none;color:var(--text-muted);padding:.35rem .5rem}.text-btn:hover{color:var(--primary-color)}.icon-btn{width:var(--touch-target);padding:0}.form-group{margin-bottom:var(--spacing-md)}.form-row{display:flex;gap:var(--spacing-md)}.form-row .form-group{flex:1}label{display:block;font-weight:600;margin-bottom:var(--spacing-xs);font-size:.85rem;letter-spacing:.02em}input,textarea,select{width:100%;padding:.6rem .85rem;min-height:var(--touch-target);border:1px solid rgba(255,255,255,.2);border-radius:var(--radius-md);font-family:inherit;font-size:1rem;background:#0f172a73;color:var(--text-main)}input::placeholder,textarea::placeholder{color:#ffffff8c}input:focus,textarea:focus,select:focus{outline:none;border-color:#6366f1cc;box-shadow:0 0 0 3px #6366f140}.password-field{position:relative}.password-field input{padding-right:3rem}.password-toggle{position:absolute;top:50%;right:.45rem;display:inline-flex;align-items:center;justify-content:center;width:2.25rem;height:2.25rem;padding:0;border:0;border-radius:var(--radius-sm);background:transparent;color:var(--text-muted);cursor:pointer;transform:translateY(-50%)}.password-toggle:hover,.password-toggle[aria-pressed=true]{color:var(--text-main);background:#ffffff14}.password-toggle:focus-visible{outline:3px solid rgba(14,165,233,.8);outline-offset:2px}.password-toggle svg{width:1.05rem;height:1.05rem;pointer-events:none}.btn:focus-visible,.card[tabindex]:focus-visible,.option-card:focus-visible,.activity-card:focus-visible,.menu-card:focus-visible,.teacher-action-card:focus-visible,.teacher-library-choice-card:focus-visible,.teacher-vocab-card:focus-visible,.teacher-vocab-pick-card:focus-visible,.delete-activity-btn:focus-visible,.close-modal:focus-visible{outline:3px solid rgba(14,165,233,.8);outline-offset:3px}.words-grid,.vocab-grid,.activities-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:var(--spacing-md);margin-top:var(--spacing-md)}.vocab-groups{display:flex;flex-direction:column;gap:var(--spacing-lg);margin-top:var(--spacing-md)}.teacher-library-groups{margin-top:var(--spacing-lg)}.teacher-library-browser{display:flex;flex-direction:column;gap:var(--spacing-md);margin-top:var(--spacing-md)}.teacher-library-breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:.45rem;min-height:34px;color:var(--text-muted);font-size:.9rem;font-weight:700}.teacher-library-crumb-btn{min-height:var(--touch-target);min-width:var(--touch-target);border:0;background:transparent;color:var(--secondary-color);font:inherit;font-weight:800;padding:.35rem .5rem;cursor:pointer}.teacher-library-crumb-btn:hover{color:var(--text-main)}.teacher-library-crumb-btn:focus-visible{outline:3px solid rgba(14,165,233,.8);outline-offset:3px;border-radius:var(--radius-sm)}.teacher-library-breadcrumb-separator{color:#cbd5f58c}.teacher-library-breadcrumb-current{color:var(--text-main)}.teacher-library-choice-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:var(--spacing-md)}.teacher-library-choice-card{display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-md);min-height:112px;padding:var(--spacing-md);border:1px solid var(--border-color);border-radius:var(--radius-md);background:#0f172a8c;color:var(--text-main);font:inherit;text-align:left;cursor:pointer;transition:transform .2s ease,border-color .2s ease,background .2s ease}.teacher-library-choice-card:hover{border-color:#ffffff57;background:#1e293ba3;transform:translateY(-2px)}.teacher-library-choice-text{display:grid;gap:.25rem;min-width:0}.teacher-library-choice-text strong,.teacher-library-choice-text small{overflow-wrap:anywhere}.teacher-library-choice-text strong{font-size:1.1rem}.teacher-library-choice-count{color:var(--text-muted);font-size:.9rem;font-weight:700}.teacher-library-choice-text small{color:var(--text-muted);font-size:.8rem}.teacher-library-choice-card svg{width:1.2rem;height:1.2rem;flex:0 0 auto;color:var(--secondary-color)}.teacher-grade-group{display:flex;flex-direction:column;gap:var(--spacing-md)}.teacher-grade-heading{display:flex;align-items:baseline;justify-content:space-between;gap:var(--spacing-md);padding:0 0 var(--spacing-sm);border-bottom:1px solid rgba(255,255,255,.18)}.teacher-grade-heading h3{color:var(--text-main);font-size:1.25rem;font-weight:800}.teacher-grade-heading span{color:var(--text-muted);font-size:.85rem;white-space:nowrap}.teacher-trimester-groups{display:flex;flex-direction:column;gap:var(--spacing-md)}.vocab-trimester-group{display:flex;flex-direction:column;gap:var(--spacing-sm)}.vocab-trimester-heading{display:flex;align-items:baseline;justify-content:space-between;gap:var(--spacing-md);border-bottom:1px solid rgba(255,255,255,.14);padding-bottom:var(--spacing-xs)}.vocab-trimester-heading h3,.vocab-trimester-heading h4{font-size:1.15rem;font-weight:700}.vocab-trimester-heading span{color:var(--text-muted);font-size:.85rem}.trimester-vocab-grid{margin-top:0}.student-vocab-month-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.student-vocab-month-group{display:flex;flex-direction:column;gap:var(--spacing-sm)}.student-vocab-month-heading{display:flex;align-items:baseline;justify-content:space-between;gap:var(--spacing-md);padding-bottom:.35rem;border-bottom:1px solid rgba(255,255,255,.1)}.student-vocab-month-heading h4{color:var(--text-main);font-size:1rem;font-weight:800}.student-vocab-month-heading span{color:var(--text-muted);font-size:.82rem}.vocab-meta-section{margin-bottom:var(--spacing-lg)}.teacher-tab-shell{justify-self:center;max-width:100%;width:auto;margin-bottom:0;overflow-x:visible;padding-bottom:0;-webkit-overflow-scrolling:touch}.teacher-mobile-menu-toggle{display:none;align-items:center;justify-content:flex-start;gap:.55rem;width:100%;min-height:var(--touch-target);min-width:var(--touch-target);padding:.55rem .75rem;border:1px solid var(--border-color);border-radius:var(--radius-sm);background:#0f172a8c;color:var(--text-main);font:inherit;font-weight:800;cursor:pointer;touch-action:manipulation}.teacher-mobile-menu-toggle span{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.teacher-mobile-menu-toggle:focus-visible{outline:3px solid 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