:root{--color-primary: #2563eb;--color-accent: #f97316;--color-surface: #ffffff;--color-background: #f8fafc;--color-text: #0f172a;--color-muted: #64748b;--color-border: #d7e0f5;--color-success: #16a34a;--color-error: #dc2626;--color-border-muted: #e2e8f0;--color-danger: #dc2626;--font-family-base: "Inter", "Helvetica Neue", Arial, sans-serif;--spacing-unit: .5rem;--radius-sm: .5rem;--radius-md: .75rem;--shadow-card: 0 12px 32px rgba(15, 23, 42, .08);--shadow-popover: 0 18px 36px rgba(15, 23, 42, .18)}*{box-sizing:border-box}body{margin:0;font-family:var(--font-family-base);color:var(--color-text);background:var(--color-background);line-height:1.6}a{color:var(--color-primary);text-decoration:none}a:hover,a:focus{text-decoration:underline}.app-shell{min-height:100vh;display:flex;flex-direction:column;margin:0 auto;max-width:960px;padding:calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 8);gap:calc(var(--spacing-unit) * 5)}@media (max-width: 768px){.app-shell{padding:calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 3)}}.app-header{display:flex;align-items:center;justify-content:space-between;gap:calc(var(--spacing-unit) * 2.5);flex-wrap:wrap}.app-title{font-size:1.75rem;font-weight:700;color:var(--color-text)}.app-nav{display:flex;align-items:center;flex-wrap:wrap;gap:calc(var(--spacing-unit) * 2.5)}.nav-link{color:var(--color-muted);font-weight:600}.nav-link--accent{color:var(--color-primary)}.nav-muted{color:var(--color-muted);font-size:.95rem}.app-main{flex:1;display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 5)}.card{background:var(--color-surface);border-radius:var(--radius-md);padding:calc(var(--spacing-unit) * 6);box-shadow:var(--shadow-card);display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 4)}@media (max-width: 640px){.card{padding:calc(var(--spacing-unit) * 4)}}.page-heading{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 2)}.page-title{margin:0;font-size:2rem;line-height:1.2}.page-subtitle{margin:0;color:var(--color-muted);max-width:48ch}.button-row{display:flex;gap:calc(var(--spacing-unit) * 2);flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:calc(var(--spacing-unit) * 1.5);padding:calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);border-radius:var(--radius-md);border:1px solid transparent;font-weight:600;cursor:pointer;transition:background .15s ease,color .15s ease,border-color .15s ease,box-shadow .15s ease;text-decoration:none}.btn:disabled{cursor:not-allowed;opacity:.65}.btn--primary{background:var(--color-primary);color:#fff}.btn--primary:hover,.btn--primary:focus-visible{background:#1d4ed8}.btn--secondary{background:var(--color-surface);color:var(--color-primary);border-color:var(--color-primary)}.btn--secondary:hover,.btn--secondary:focus-visible{background:#2563eb14}.btn--ghost{background:transparent;color:var(--color-primary)}.btn--ghost:hover,.btn--ghost:focus-visible{background:#2563eb1f}.btn--link{background:transparent;color:var(--color-primary);padding:0}.alert{border-radius:var(--radius-md);padding:calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 4);font-weight:500}.alert--info{background:#e0f2fe;color:#0c4a6e}.alert--success{background:#dcfce7;color:#166534}.alert--error{background:#fee2e2;color:#b91c1c}.form-grid{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 3)}.form-field{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 1.5)}.form-field--error .input{border-color:var(--color-error)}.form-label{font-weight:600;color:var(--color-text)}.input{width:100%;padding:calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);border-radius:var(--radius-md);border:1px solid var(--color-border);font-size:1rem;transition:border-color .15s ease,box-shadow .15s ease;background:#fff}.input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #2563eb26}.input-with-addon{display:flex;align-items:center;border:1px solid var(--color-border);border-radius:var(--radius-md);background:#fff;transition:border-color .15s ease,box-shadow .15s ease}.input-with-addon:focus-within{border-color:var(--color-primary);box-shadow:0 0 0 3px #2563eb26}.input-with-addon--error{border-color:var(--color-error)}.input-with-addon .input{border:none;box-shadow:none;padding:calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3)}.input-addon-button{background:none;border:none;color:var(--color-primary);font-weight:600;padding:0 calc(var(--spacing-unit) * 2.5);cursor:pointer}.input-addon-button:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.form-hint{color:var(--color-muted);font-size:.875rem}.form-error{color:var(--color-error);font-size:.875rem}.progress-widget{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 2.5)}.progress-bar__track{width:100%;height:.75rem;background:#e2e8f0;border-radius:999px;overflow:hidden}.progress-bar__fill{height:100%;background:var(--color-primary);transition:width .3s ease}.progress-bar__label{font-weight:600}.module-list{display:grid;gap:calc(var(--spacing-unit) * 3)}.module-week-list{display:grid;gap:calc(var(--spacing-unit) * 4)}.module-week{display:grid;gap:calc(var(--spacing-unit) * 2)}.module-week__header{display:flex;align-items:baseline;justify-content:space-between}.module-week__title{margin:0;font-size:1rem;font-weight:600}.module-week__modules{display:grid;gap:calc(var(--spacing-unit) * 2)}.module-item{display:flex;align-items:center;justify-content:space-between;gap:calc(var(--spacing-unit) * 2);padding:calc(var(--spacing-unit) * 3);border:1px solid var(--color-border);border-radius:var(--radius-md);background:#fff}.module-actions{display:flex;align-items:center;gap:calc(var(--spacing-unit) * 2)}.module-title{margin:0;font-weight:600}.badge{display:inline-flex;align-items:center;padding:.25rem .75rem;border-radius:999px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.03em}.badge--open{background:#2563eb29;color:var(--color-primary)}.badge--locked{background:#64748b29;color:var(--color-muted)}.badge--completed{background:#16a34a29;color:var(--color-success)}.badge--deleted{background:#ef444429;color:var(--color-danger)}.settings-grid{display:grid;gap:calc(var(--spacing-unit) * 6)}.settings-section{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 3)}.settings-section h2{margin:0;font-size:1.35rem}.radio-group{display:flex;gap:calc(var(--spacing-unit) * 3);flex-wrap:wrap}.radio-option{display:flex;align-items:center;gap:calc(var(--spacing-unit) * 1.5);font-weight:500;color:var(--color-text)}.radio-option input[type=radio]{width:1.1rem;height:1.1rem}.status-grid{display:grid;gap:calc(var(--spacing-unit) * 3)}.cta-row{display:flex;flex-wrap:wrap;gap:calc(var(--spacing-unit) * 2);align-items:center}.text-muted{color:var(--color-muted)}.inline-link{color:var(--color-primary);font-weight:600}.spinner-card{display:flex;justify-content:center;align-items:center;min-height:160px}.toast-region{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 2.5)}.admin-gate{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 2);text-align:center}.admin-dashboard{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 5)}.admin-dashboard__header{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:calc(var(--spacing-unit) * 2.5)}.admin-dashboard__title{margin:0;font-size:1.75rem}.admin-dashboard__timestamp{color:var(--color-muted);font-size:.95rem}.admin-dashboard__grid{display:grid;gap:calc(var(--spacing-unit) * 3);grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}.admin-stats-card{background:var(--color-surface);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding:calc(var(--spacing-unit) * 4);display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 1.5)}.admin-stats-card__title{font-size:.9rem;color:var(--color-muted);text-transform:uppercase;letter-spacing:.05em}.admin-stats-card__value{font-size:2rem;font-weight:600;color:var(--color-text)}.admin-stats-card__subtitle{font-size:.95rem;color:var(--color-muted)}.admin-stats-card--interactive{cursor:pointer;transition:transform .15s ease,box-shadow .15s ease}.admin-stats-card--interactive:hover,.admin-stats-card--interactive:focus{transform:translateY(-2px);box-shadow:var(--shadow-card);outline:none}.admin-dashboard__charts{display:grid;gap:calc(var(--spacing-unit) * 3);grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}.admin-dashboard__chart-header{display:flex;align-items:baseline;justify-content:space-between;gap:calc(var(--spacing-unit) * 2);margin-bottom:calc(var(--spacing-unit) * 2)}.admin-dashboard__chart-header h3{margin:0}.admin-dashboard__chart-body{height:280px}.admin-dashboard__insights{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 2)}.admin-dashboard__insights-title{font-weight:600;color:var(--color-text)}.admin-layout{display:flex;gap:calc(var(--spacing-unit) * 4);align-items:flex-start}.admin-layout__sidebar{width:220px;background:var(--color-surface);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding:calc(var(--spacing-unit) * 4);display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 3)}.admin-layout__title{margin:0;font-size:1.5rem}.admin-layout__nav{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 2)}.admin-layout__nav-link{color:var(--color-muted);font-weight:600}.admin-layout__nav-link--active{color:var(--color-primary)}.admin-layout__notes{font-size:.9rem}.admin-layout__content{flex:1;min-width:0}.admin-users{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 4)}.admin-users__header{display:flex;align-items:flex-start;justify-content:space-between;gap:calc(var(--spacing-unit) * 3);flex-wrap:wrap}.admin-users__title{margin:0;font-size:1.75rem}.admin-users__filters{display:flex;gap:calc(var(--spacing-unit) * 2)}.admin-users__filters select{padding:calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);border-radius:var(--radius-sm);border:1px solid var(--color-border)}.admin-users__toggle{display:inline-flex;align-items:center;gap:calc(var(--spacing-unit) * 1.5);font-size:.9rem;color:var(--color-muted)}.admin-users__toggle input[type=checkbox]{width:18px;height:18px}.admin-users__deleted-alert{display:flex;flex-wrap:wrap;align-items:center;gap:calc(var(--spacing-unit) * 2)}.admin-users__toolbar{display:flex;justify-content:space-between;gap:calc(var(--spacing-unit) * 2);flex-wrap:wrap}.admin-users__search input{min-width:260px;padding:calc(var(--spacing-unit) * 2);border-radius:var(--radius-sm);border:1px solid var(--color-border)}.admin-users__table-wrapper{overflow-x:auto}.admin-users__table{width:100%;border-collapse:collapse}.admin-users__table th,.admin-users__table td{text-align:left;padding:calc(var(--spacing-unit) * 2);border-bottom:1px solid var(--color-border-muted)}.admin-users__table tr:hover{background:#2563eb14;cursor:pointer}.admin-users__footer{display:flex;align-items:center;justify-content:space-between;gap:calc(var(--spacing-unit) * 2);flex-wrap:wrap;margin-top:calc(var(--spacing-unit) * 3)}.admin-users__pagination{display:flex;align-items:center;gap:calc(var(--spacing-unit) * 2)}.admin-users__pagination-status{font-weight:600}.admin-users__drawer-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a73;display:flex;justify-content:flex-end;z-index:50}.admin-users__drawer{width:min(420px,100%);background:var(--color-surface);box-shadow:var(--shadow-popover);padding:calc(var(--spacing-unit) * 5);display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 3);overflow-y:auto}.admin-users__drawer-header{display:flex;align-items:flex-start;justify-content:space-between;gap:calc(var(--spacing-unit) * 2)}.admin-users__drawer-title{margin:0;font-size:1.4rem}.admin-users__drawer-close{background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--color-muted)}.admin-users__drawer-content{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 4)}.admin-users__drawer-section{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 2)}.admin-users__drawer-section h4{margin:0}.admin-users__label{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 1);font-size:.95rem}.admin-users__label input{padding:calc(var(--spacing-unit) * 2);border-radius:var(--radius-sm);border:1px solid var(--color-border)}.admin-users__action-row{display:flex;flex-wrap:wrap;gap:calc(var(--spacing-unit) * 2)}.admin-users__danger{color:var(--color-danger)}.admin-users__enrollments{width:100%;border-collapse:collapse}.admin-users__enrollments th,.admin-users__enrollments td{text-align:left;padding:calc(var(--spacing-unit) * 1.5);border-bottom:1px solid var(--color-border-muted)}.admin-users__activity{margin:0;padding-left:calc(var(--spacing-unit) * 3);display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 1.5)}.admin-users__tabs{display:flex;gap:calc(var(--spacing-unit) * 2);border-bottom:1px solid var(--color-border-muted);padding-bottom:calc(var(--spacing-unit) * 2)}.admin-users__tab{background:none;border:none;font-weight:600;color:var(--color-muted);cursor:pointer;padding:calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);border-radius:var(--radius-sm)}.admin-users__tab--active{background:#2563eb1f;color:var(--color-text)}.admin-users__tab-panel{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 3)}.admin-users__module-header{display:flex;justify-content:space-between;gap:calc(var(--spacing-unit) * 2);align-items:center}.admin-users__modules-table .admin-users__status{text-transform:capitalize}.admin-users__module-actions{display:flex;flex-wrap:wrap;gap:calc(var(--spacing-unit) * 1.5)}.admin-users__action-column{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 2);max-width:260px}.admin-audit__table code{font-size:.75rem;white-space:pre-wrap}.admin-audit__meta{display:flex;flex-direction:column;gap:calc(var(--spacing-unit) * 1)}.admin-audit__filters{flex-wrap:wrap}.admin-audit__filters input{padding:calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);border-radius:var(--radius-sm);border:1px solid var(--color-border)}.admin-users__meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:calc(var(--spacing-unit) * 2)}.admin-users__meta dt{font-weight:600;color:var(--color-muted)}.admin-users__meta dd{margin:0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}