@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--gray-25: #F8FAFC;--gray-50: #F1F5F9;--gray-100: #E2E8F0;--gray-200: #CBD5E1;--gray-300: #94A3B8;--gray-400: #64748B;--gray-500: #475569;--gray-600: #334155;--gray-700: #1E293B;--gray-800: #0F172A;--gray-900: #020617;--gray-950: #010409;--primary-25: #F0FDFA;--primary-50: #F0FDFA;--primary-100: #CCFBF1;--primary-200: #99F6E4;--primary-300: #5EEAD4;--primary-400: #2DD4BF;--primary-500: #14B8A6;--primary-600: #0D9488;--primary-700: #0F766E;--primary-800: #115E59;--primary-900: #134E4A;--success-50: #ECFDF5;--success-100: #D1FADF;--success-500: #12B76A;--success-600: #039855;--success-700: #027A48;--success-900: #054F31;--warning-25: #FFFCF5;--warning-50: #FFFAEB;--warning-100: #FEF0C7;--warning-500: #F79009;--warning-600: #DC6803;--warning-700: #B54708;--warning-900: #7A2E0E;--error-50: #FEF3F2;--error-500: #F04438;--error-600: #D92D20;--error-700: #B42318;--bg-primary: #FFFFFF;--bg-secondary: #FDFCFA;--bg-tertiary: var(--gray-50);--bg-inset: var(--gray-50);--card-bg: var(--bg-primary);--text-primary: var(--gray-900);--text-secondary: var(--gray-600);--text-tertiary: var(--gray-500);--text-placeholder: var(--gray-400);--text-white: #FFFFFF;--text-brand: var(--primary-600);--border-primary: var(--gray-200);--border-secondary: var(--gray-300);--border-brand: var(--primary-300);--border-color: var(--border-primary);--shadow-xs: 0px 1px 2px rgba(16, 24, 40, .05);--shadow-sm: 0px 1px 3px rgba(16, 24, 40, .1), 0px 1px 2px rgba(16, 24, 40, .06);--shadow-md: 0px 4px 8px -2px rgba(16, 24, 40, .1), 0px 2px 4px -2px rgba(16, 24, 40, .06);--shadow-lg: 0px 12px 16px -4px rgba(16, 24, 40, .08), 0px 4px 6px -2px rgba(16, 24, 40, .03);--shadow-xl: 0px 20px 24px -4px rgba(16, 24, 40, .08), 0px 8px 8px -4px rgba(16, 24, 40, .03);--shadow-2xl: 0px 24px 48px -12px rgba(16, 24, 40, .18);--shadow-focus: 0px 0px 0px 4px rgba(13, 148, 136, .24);--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-2xl: 20px;--radius-full: 9999px;--sp-1: 4px;--sp-2: 8px;--sp-3: 12px;--sp-4: 16px;--sp-5: 20px;--sp-6: 24px;--sp-8: 32px;--sp-10: 40px;--sp-12: 48px;--sp-16: 64px;--sp-20: 80px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .2s cubic-bezier(.4, 0, .2, 1);--transition-smooth: .3s cubic-bezier(.4, 0, .2, 1);--sidebar-width: 260px;--header-height: 64px}[data-theme=dark]{color-scheme:dark;--gray-25: #0B1120;--gray-50: #111827;--gray-100: #1F2937;--gray-200: #334155;--gray-300: #475569;--gray-400: #64748B;--gray-500: #94A3B8;--gray-600: #CBD5E1;--gray-700: #E2E8F0;--gray-800: #F1F5F9;--gray-900: #F8FAFC;--gray-950: #FFFFFF;--primary-25: rgba(20, 184, 166, .1);--primary-50: rgba(20, 184, 166, .14);--primary-100: rgba(20, 184, 166, .2);--primary-200: rgba(45, 212, 191, .32);--primary-300: #5EEAD4;--primary-400: #2DD4BF;--primary-500: #14B8A6;--primary-600: #2DD4BF;--primary-700: #5EEAD4;--primary-800: #99F6E4;--primary-900: #CCFBF1;--success-50: rgba(18, 183, 106, .14);--success-100: rgba(18, 183, 106, .22);--success-500: #32D583;--success-600: #6CE9A6;--success-700: #A6F4C5;--success-900: #D1FADF;--warning-25: rgba(247, 144, 9, .1);--warning-50: rgba(247, 144, 9, .14);--warning-100: rgba(247, 144, 9, .22);--warning-500: #FDB022;--warning-600: #FEC84B;--warning-700: #FEDF89;--warning-900: #FEF0C7;--error-50: rgba(240, 68, 56, .14);--error-500: #F97066;--error-600: #FDA29B;--error-700: #FECDCA;--bg-primary: #111827;--bg-secondary: #0B1120;--bg-tertiary: #1F2937;--bg-inset: #0F172A;--card-bg: #111827;--text-primary: #F8FAFC;--text-secondary: #CBD5E1;--text-tertiary: #94A3B8;--text-placeholder: #64748B;--text-brand: #5EEAD4;--border-primary: rgba(148, 163, 184, .2);--border-secondary: rgba(148, 163, 184, .3);--border-brand: rgba(94, 234, 212, .46);--border-color: var(--border-primary);--shadow-xs: 0px 1px 2px rgba(0, 0, 0, .35);--shadow-sm: 0px 1px 3px rgba(0, 0, 0, .45), 0px 1px 2px rgba(0, 0, 0, .35);--shadow-md: 0px 8px 18px rgba(0, 0, 0, .35);--shadow-lg: 0px 16px 30px rgba(0, 0, 0, .4);--shadow-xl: 0px 24px 44px rgba(0, 0, 0, .45);--shadow-2xl: 0px 32px 64px rgba(0, 0, 0, .55);--shadow-focus: 0px 0px 0px 4px rgba(45, 212, 191, .22)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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var(--border-primary);height:var(--header-height)}.sidebar-brand-icon{width:32px;height:32px;background:var(--primary-600);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:14px}.sidebar-brand-text{font-size:1.125rem;font-weight:700;color:var(--text-primary);letter-spacing:-.03em}.sidebar-brand-badge{font-size:.625rem;font-weight:600;color:var(--primary-600);background:var(--primary-50);padding:2px 6px;border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.05em;margin-left:auto}.sidebar-nav{flex:1;padding:var(--sp-4);overflow-y:auto}.sidebar-section-label{font-size:.6875rem;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.08em;padding:var(--sp-4) var(--sp-3) var(--sp-2)}.sidebar-link{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-2) var(--sp-3);border-radius:var(--radius-md);color:var(--text-secondary);font-weight:500;font-size:.875rem;text-decoration:none;transition:all var(--transition-fast);cursor:pointer;border:none;background:none;width:100%;text-align:left}.sidebar-link:hover{background:var(--bg-secondary);color:var(--text-primary)}.sidebar-link.active{background:var(--primary-50);color:var(--primary-700);font-weight:600}.sidebar-link .link-icon{width:20px;height:20px;flex-shrink:0;display:flex;align-items:center;justify-content:center}.sidebar-link .link-badge{margin-left:auto;font-size:.75rem;font-weight:600;background:var(--error-50);color:var(--error-600);padding:1px 8px;border-radius:var(--radius-full)}.sidebar-footer{padding:var(--sp-4);border-top:1px solid var(--border-primary)}.sidebar-user{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-2) var(--sp-3);border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition-fast)}.sidebar-user:hover{background:var(--bg-secondary)}.sidebar-avatar{width:36px;height:36px;border-radius:var(--radius-full);background:var(--primary-100);color:var(--primary-700);font-weight:600;font-size:.875rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}.sidebar-user-info{flex:1;min-width:0}.sidebar-user-name{font-size:.875rem;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-user-role{font-size:.75rem;color:var(--text-tertiary)}.main-content{margin-left:var(--sidebar-width);flex:1;min-height:100vh;display:flex;flex-direction:column}.page-header{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg-secondary) 84%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-primary);padding:var(--sp-5) var(--sp-8);display:flex;align-items:center;justify-content:space-between;min-height:var(--header-height)}.page-header-breadcrumb{font-size:.8125rem;color:var(--text-tertiary);display:flex;align-items:center;gap:var(--sp-2)}.page-header-breadcrumb span{color:var(--text-primary);font-weight:500}.page-header-title{font-size:1.25rem;font-weight:700;color:var(--text-primary);letter-spacing:-.02em}.page-header-right{display:flex;align-items:center;gap:var(--sp-3)}.page-body{flex:1;padding:var(--sp-8)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--sp-2);font-family:inherit;font-weight:600;font-size:.875rem;border-radius:var(--radius-full);padding:10px 20px;cursor:pointer;transition:all var(--transition-fast);border:1px solid 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12px}.btn-ghost:hover:not(:disabled){background:var(--bg-secondary);color:var(--text-primary)}.btn-danger{background:var(--error-600);color:#fff;border-color:var(--error-600)}.btn-success{background:var(--success-600);color:#fff;border-color:var(--success-600)}.btn-success:hover:not(:disabled){background:var(--success-700)}.btn-sm{padding:6px 12px;font-size:.8125rem}.btn-lg{padding:12px 20px;font-size:1rem}.btn-icon{padding:8px;min-width:36px;min-height:36px}.card{background:var(--bg-primary);border:1px solid var(--border-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:box-shadow var(--transition-base),transform var(--transition-base)}.card-hover:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.card-header{padding:var(--sp-5) var(--sp-6);border-bottom:1px solid var(--border-primary);display:flex;align-items:center;justify-content:space-between}.card-footer{padding:var(--sp-4) var(--sp-6);border-top:1px solid var(--border-primary);display:flex;align-items:center;justify-content:flex-end;gap:var(--sp-3)}.stripe-payment-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1200;display:flex;align-items:center;justify-content:center;padding:clamp(12px,2vw,24px);background:#0f172ab8;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.stripe-payment-dialog{width:min(100%,560px);max-height:calc(100dvh - 32px);display:flex;flex-direction:column;overflow:hidden;border-radius:var(--radius-xl)}.stripe-payment-header{flex-shrink:0;display:flex;align-items:flex-start;justify-content:space-between;gap:var(--sp-4)}.stripe-payment-body{overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}.payment-result-page{min-height:100%;display:grid;place-items:center;padding:clamp(20px,4vw,48px);background:radial-gradient(circle at top left,rgba(20,184,166,.12),transparent 36%),radial-gradient(circle at bottom right,rgba(99,102,241,.12),transparent 32%),var(--bg-secondary)}.payment-result-card{width:min(100%,560px);padding:clamp(24px,5vw,48px);border:1px solid var(--border-primary);border-radius:var(--radius-xl);background:var(--bg-primary);box-shadow:var(--shadow-xl);text-align:center}.payment-result-icon{width:76px;height:76px;margin:0 auto var(--sp-5);display:grid;place-items:center;border-radius:999px}.payment-result-card-success .payment-result-icon{color:var(--success-700);background:var(--success-50)}.payment-result-card-failed .payment-result-icon{color:var(--error-600);background:var(--error-50)}.payment-result-kicker{margin-bottom:var(--sp-2);font-size:.75rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.payment-result-card-success .payment-result-kicker{color:var(--success-700)}.payment-result-card-failed .payment-result-kicker{color:var(--error-600)}.payment-result-card h1{margin:0 0 var(--sp-3);font-size:clamp(1.75rem,4vw,2.5rem);line-height:1.1;color:var(--text-primary)}.payment-result-message{max-width:420px;margin:0 auto var(--sp-7);color:var(--text-secondary);line-height:1.6}.payment-result-details{display:grid;gap:var(--sp-3);margin-bottom:var(--sp-7);padding:var(--sp-4);border:1px solid var(--border-primary);border-radius:var(--radius-lg);background:var(--bg-secondary);text-align:left}.payment-result-details>div{display:flex;align-items:center;justify-content:space-between;gap:var(--sp-4)}.payment-result-details span{color:var(--text-secondary);font-size:.875rem}.payment-result-details strong{color:var(--text-primary);font-size:.875rem;text-align:right;overflow-wrap:anywhere}.payment-result-actions{display:grid;grid-template-columns:1fr 1fr;gap:var(--sp-3)}@media (max-width: 640px){.stripe-payment-overlay{align-items:flex-end;padding:var(--sp-2)}.stripe-payment-dialog{width:100%;max-height:calc(100dvh - 16px);border-radius:var(--radius-lg)}.stripe-payment-header,.stripe-payment-body{padding:var(--sp-4)}.payment-result-page{align-items:stretch;padding:var(--sp-4)}.payment-result-card{align-self:center;border-radius:var(--radius-lg)}.payment-result-details>div{align-items:flex-start;flex-direction:column;gap:4px}.payment-result-details strong{text-align:left}.payment-result-actions{grid-template-columns:1fr}}.stat-card{display:flex;flex-direction:column;gap:var(--sp-1)}.stat-card .stat-icon{width:40px;height:40px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.25rem;margin-bottom:var(--sp-2)}.stat-card .stat-value{font-size:1.875rem;font-weight:700;color:var(--text-primary);letter-spacing:-.03em;line-height:1.15}.stat-card .stat-label{font-size:.875rem;color:var(--text-secondary);font-weight:500}.stat-card .stat-change{font-size:.8125rem;font-weight:600;display:inline-flex;align-items:center;gap:4px;margin-top:var(--sp-2)}.stat-change.positive{color:var(--success-600)}.stat-change.negative{color:var(--error-600)}table{width:100%;border-collapse:collapse}thead th{text-align:left;font-size:.75rem;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.06em;padding:var(--sp-3) var(--sp-4);border-bottom:1px solid var(--border-primary);background:var(--bg-secondary);white-space:nowrap}tbody td{padding:var(--sp-4);font-size:.875rem;color:var(--text-primary);border-bottom:1px solid var(--border-primary);vertical-align:middle}tbody tr{transition:background var(--transition-fast)}tbody tr:hover{background:var(--bg-secondary)}tbody tr:last-child td{border-bottom:none}.badge{display:inline-flex;align-items:center;gap:4px;padding:2px 10px;border-radius:var(--radius-full);font-size:.75rem;font-weight:600;white-space:nowrap;line-height:1.4}.badge-gray{background:var(--gray-100);color:var(--gray-700)}.badge-error{background:var(--error-50);color:var(--error-700)}.input{display:block;width:100%;padding:10px 14px;font-family:inherit;font-size:.875rem;color:var(--text-primary);background:var(--bg-primary);border:1px solid var(--border-secondary);border-radius:var(--radius-md);transition:border-color var(--transition-fast),box-shadow var(--transition-fast);outline:none;line-height:1.5}.input::placeholder{color:var(--text-placeholder)}.input:focus{border-color:var(--primary-300);box-shadow:var(--shadow-focus)}.input-lg{padding:12px 16px;font-size:1rem}textarea.input{resize:vertical;min-height:80px}.form-label{display:block;font-size:.875rem;font-weight:500;color:var(--text-secondary);margin-bottom:var(--sp-1)}.form-hint{font-size:.8125rem;color:var(--text-tertiary)}.form-error{font-size:.8125rem;color:var(--error-600)}.tabs{display:flex;gap:0;border-bottom:1px solid var(--border-primary);margin-bottom:var(--sp-6)}.tab{padding:var(--sp-3) var(--sp-4);font-size:.875rem;font-weight:500;color:var(--text-tertiary);cursor:pointer;background:none;border:none;border-bottom:2px solid transparent;margin-bottom:-1px;transition:all var(--transition-fast);font-family:inherit}.tab:hover{color:var(--text-secondary)}.tab.active{color:var(--primary-700);border-bottom-color:var(--primary-600);font-weight:600}.progress-bar{width:100%;height:8px;background:var(--gray-100);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:var(--primary-500);border-radius:var(--radius-full);transition:width var(--transition-smooth)}.progress-fill.success{background:var(--success-500)}.progress-fill.warning{background:var(--warning-500)}.avatar{display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius-full);font-weight:600;flex-shrink:0}.avatar-sm{width:28px;height:28px;font-size:.6875rem}.avatar-md{width:36px;height:36px;font-size:.8125rem}.avatar-lg{width:48px;height:48px;font-size:1.125rem}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--sp-16) var(--sp-8);text-align:center}.empty-state-icon{width:48px;height:48px;background:var(--gray-100);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:var(--gray-400);margin-bottom:var(--sp-4)}.empty-state h3{margin-bottom:var(--sp-2)}.empty-state p{max-width:360px;margin-bottom:var(--sp-5)}.toast-container{position:fixed;bottom:var(--sp-8);right:var(--sp-8);z-index:100;display:flex;flex-direction:column;gap:var(--sp-3)}.toast{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-3) var(--sp-5);background:var(--gray-900);color:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);font-size:.875rem;font-weight:500;animation:toast-in .3s ease;min-width:320px}@keyframes toast-in{0%{opacity:0;transform:translateY(12px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}.skeleton{background:linear-gradient(90deg,var(--gray-100) 25%,var(--gray-200) 50%,var(--gray-100) 75%);background-size:400% 100%;animation:skeleton-shimmer 1.5s ease infinite;border-radius:var(--radius-md)}@keyframes skeleton-shimmer{0%{background-position:200% 0}to{background-position:-200% 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p{font-size:.8125rem;line-height:1.5;margin:0}.ls-student-card{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-2) var(--sp-3);border-radius:var(--radius-md);margin-bottom:2px;transition:background 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var(--success-100)}.ls-online-dot.offline{background:var(--gray-300)}.ls-student-card.waiting{border-left:3px solid var(--gray-200)}.ls-student-card.submitted{border-left:3px solid var(--success-500)}.theme-toggle{margin-top:var(--sp-2)}.theme-toggle .link-icon{color:var(--primary-600)}.card,.auth-card,.modal-card,.dialog-card,.stripe-payment-dialog,.modal,.session-roster-panel,.session-footer,.session-toolbar,.ls-topbar,.ls-phase-nav,.ls-content-card,.ls-panel,.ls-student-card{background:var(--card-bg, 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p{margin:0}.billing-plan-body{padding:var(--sp-8);display:flex;flex-direction:column;gap:var(--sp-6)}.billing-primary-action{min-height:48px;border-radius:var(--radius-lg)}.billing-action-stack{display:flex;flex-direction:column;gap:var(--sp-3)}.billing-fine-print{margin:0;text-align:center}.marketplace-access-banner{display:flex;justify-content:space-between;align-items:center;gap:var(--sp-5);margin-bottom:var(--sp-6);border-color:var(--border-brand);background:var(--primary-50)}.marketplace-access-banner.is-unlocked{background:var(--success-50);border-color:var(--success-100)}.marketplace-access-banner h3{margin:var(--sp-2) 0 var(--sp-1);font-size:1.25rem}.marketplace-access-banner p{margin:0;max-width:720px}@media (max-width: 900px){.billing-page-grid,.billing-hero{grid-template-columns:1fr;flex-direction:column;align-items:stretch}.marketplace-access-banner{flex-direction:column;align-items:stretch}.billing-detail-row,.billing-access-table 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