:root{--space-0: 0;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-20: 5rem;--space-24: 6rem;--space-xs: var(--space-2);--space-sm: var(--space-3);--space-md: var(--space-4);--space-lg: var(--space-6);--space-xl: var(--space-8);--space-2xl: var(--space-12);--space-3xl: var(--space-16);--radius-none: 0;--radius-sm: .25rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--radius-3xl: 2rem;--radius-full: 9999px;--radius-button: var(--radius-xl);--radius-card: var(--radius-2xl);--radius-input: var(--radius-lg);--radius-badge: var(--radius-full);--shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, .1), 0 1px 2px -1px rgba(0, 0, 0, .1);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .1);--shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, .25);--shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, .05);--shadow-dark-sm: 0 1px 3px 0 rgba(0, 0, 0, .3), 0 1px 2px -1px rgba(0, 0, 0, .3);--shadow-dark-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -2px rgba(0, 0, 0, .4);--shadow-dark-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -4px rgba(0, 0, 0, .5);--z-base: 0;--z-dropdown: 1000;--z-sticky: 1020;--z-fixed: 1030;--z-modal-backdrop: 1040;--z-modal: 1050;--z-popover: 1060;--z-tooltip: 1070;--z-toast: 1080;--z-max: 9999;--color-brand-50: #FFFBEB;--color-brand-100: #FEF3C7;--color-brand-200: #FDE68A;--color-brand-300: #FCD34D;--color-brand-400: #FBBF24;--color-brand-500: #FBBF24;--color-brand-600: #D97706;--color-brand-700: #B45309;--color-brand-800: #92400E;--color-brand-900: #78350F;--color-success-50: #ecfdf5;--color-success-100: #d1fae5;--color-success-500: #10b981;--color-success-600: #059669;--color-success-700: #047857;--color-warning-50: #fffbeb;--color-warning-100: #fef3c7;--color-warning-500: #f59e0b;--color-warning-600: #d97706;--color-warning-700: #b45309;--color-error-50: #fef2f2;--color-error-100: #fee2e2;--color-error-500: #ef4444;--color-error-600: #dc2626;--color-error-700: #b91c1c;--color-info-50: #eff6ff;--color-info-100: #dbeafe;--color-info-500: #3b82f6;--color-info-600: #2563eb;--color-info-700: #1d4ed8;--color-gray-50: #f9fafb;--color-gray-100: #f3f4f6;--color-gray-200: #e5e7eb;--color-gray-300: #d1d5db;--color-gray-400: #9ca3af;--color-gray-500: #6b7280;--color-gray-600: #4b5563;--color-gray-700: #374151;--color-gray-800: #1f2937;--color-gray-900: #111827;--font-sans: "Inter", ui-sans-serif, system-ui, sans-serif;--font-mono: "Roboto Mono", ui-monospace, monospace;--text-display-2xl: 4.5rem;--text-display-xl: 3.75rem;--text-display-lg: 3rem;--text-display-md: 2.25rem;--text-display-sm: 1.875rem;--text-heading-1: 2.25rem;--text-heading-2: 1.875rem;--text-heading-3: 1.5rem;--text-heading-4: 1.25rem;--text-heading-5: 1.125rem;--text-heading-6: 1rem;--text-body-xl: 1.25rem;--text-body-lg: 1.125rem;--text-body-md: 1rem;--text-body-sm: .875rem;--text-body-xs: .75rem;--text-caption: .75rem;--text-overline: .625rem;--text-child-display: 3rem;--text-child-title: 2rem;--text-child-subtitle: 1.5rem;--text-child-body: 1.125rem;--text-child-label: 1rem;--text-child-caption: .875rem;--size-child-button-height: 3rem;--size-child-input-height: 3rem;--size-child-icon: 1.5rem;--size-child-touch-target: 2.75rem;--leading-none: 1;--leading-tight: 1.25;--leading-snug: 1.375;--leading-normal: 1.5;--leading-relaxed: 1.625;--leading-loose: 2;--font-thin: 100;--font-extralight: 200;--font-light: 300;--font-normal: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--font-extrabold: 800;--font-black: 900;--duration-fast: .15s;--duration-normal: .2s;--duration-slow: .3s;--duration-slower: .5s;--ease-in: cubic-bezier(.4, 0, 1, 1);--ease-out: cubic-bezier(0, 0, .2, 1);--ease-in-out: cubic-bezier(.4, 0, .2, 1);--ease-bounce: cubic-bezier(.34, 1.56, .64, 1);--breakpoint-sm: 640px;--breakpoint-md: 768px;--breakpoint-lg: 1024px;--breakpoint-xl: 1280px;--breakpoint-2xl: 1536px;--container-sm: 640px;--container-md: 768px;--container-lg: 1024px;--container-xl: 1280px;--container-2xl: 1536px}@layer utilities{.space-xs{gap:var(--space-xs)}.space-sm{gap:var(--space-sm)}.space-md{gap:var(--space-md)}.space-lg{gap:var(--space-lg)}.space-xl{gap:var(--space-xl)}.p-xs{padding:var(--space-xs)}.p-sm{padding:var(--space-sm)}.p-md{padding:var(--space-md)}.p-lg{padding:var(--space-lg)}.p-xl{padding:var(--space-xl)}.m-xs{margin:var(--space-xs)}.m-sm{margin:var(--space-sm)}.m-md{margin:var(--space-md)}.m-lg{margin:var(--space-lg)}.m-xl{margin:var(--space-xl)}.rounded-button{border-radius:var(--radius-button)}.rounded-card{border-radius:var(--radius-card)}.rounded-input{border-radius:var(--radius-input)}.rounded-badge{border-radius:var(--radius-badge)}.shadow-card{box-shadow:var(--shadow-md)}.shadow-card-hover{box-shadow:var(--shadow-lg)}.shadow-button{box-shadow:var(--shadow-sm)}.shadow-button-hover{box-shadow:var(--shadow-md)}.text-display-2xl{font-size:var(--text-display-2xl);line-height:var(--leading-tight)}.text-display-xl{font-size:var(--text-display-xl);line-height:var(--leading-tight)}.text-display-lg{font-size:var(--text-display-lg);line-height:var(--leading-tight)}.text-heading-1{font-size:var(--text-heading-1);line-height:var(--leading-tight);font-weight:var(--font-bold)}.text-heading-2{font-size:var(--text-heading-2);line-height:var(--leading-tight);font-weight:var(--font-bold)}.text-heading-3{font-size:var(--text-heading-3);line-height:var(--leading-snug);font-weight:var(--font-semibold)}.text-heading-4{font-size:var(--text-heading-4);line-height:var(--leading-snug);font-weight:var(--font-semibold)}.text-body-xl{font-size:var(--text-body-xl);line-height:var(--leading-normal)}.text-body-lg{font-size:var(--text-body-lg);line-height:var(--leading-normal)}.text-body-md{font-size:var(--text-body-md);line-height:var(--leading-normal)}.text-body-sm{font-size:var(--text-body-sm);line-height:var(--leading-normal)}.text-caption{font-size:var(--text-caption);line-height:var(--leading-normal)}.text-child-display{font-size:var(--text-child-display);line-height:var(--leading-tight);font-weight:var(--font-bold)}.text-child-title{font-size:var(--text-child-title);line-height:var(--leading-tight);font-weight:var(--font-bold)}.text-child-subtitle{font-size:var(--text-child-subtitle);line-height:var(--leading-snug);font-weight:var(--font-semibold)}.text-child-body{font-size:var(--text-child-body);line-height:var(--leading-relaxed);font-weight:var(--font-medium)}.text-child-label{font-size:var(--text-child-label);line-height:var(--leading-normal);font-weight:var(--font-medium)}.text-child-caption{font-size:var(--text-child-caption);line-height:var(--leading-normal);font-weight:var(--font-medium)}.text-child-contrast{color:var(--color-gray-800)}.text-child-contrast-muted{color:var(--color-gray-700)}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}body{min-width:320px;min-height:100vh;font-family:Manrope,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;font-size:15px;line-height:1.5;color:#1f2937;background:#f8fafc}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer;background:transparent;border:none;padding:0}button:disabled,input:disabled,select:disabled{cursor:not-allowed;opacity:.62}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid var(--color-brand-400);outline-offset:2px;border-radius:var(--radius-md)}img,svg{display:block;max-width:100%}.shell{display:grid;grid-template-columns:260px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;display:flex;flex-direction:column;gap:var(--space-6);height:100vh;padding:var(--space-5) var(--space-4);border-right:1px solid #E5E7EB;background:#fff}.brand{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2);border-radius:var(--radius-lg);transition:background-color var(--duration-fast) var(--ease-out)}.brand:hover{background:var(--color-brand-50)}.brand-logo{width:36px;height:36px;flex-shrink:0}.brand-text{display:flex;flex-direction:column;line-height:1.2}.brand-text strong{font-size:15px;font-weight:var(--font-bold);color:#1f2937;letter-spacing:-.01em}.brand-text small{font-size:12px;color:#9ca3af;letter-spacing:.04em;text-transform:uppercase;font-weight:var(--font-medium)}.side-nav{display:flex;flex-direction:column;gap:var(--space-1);flex:1;padding-top:var(--space-2)}.side-nav a{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-3);border-radius:var(--radius-lg);font-size:14px;font-weight:var(--font-medium);color:#6b7280;transition:background-color var(--duration-fast) var(--ease-out),color var(--duration-fast) var(--ease-out)}.side-nav a:hover{background:#f9fafb;color:#1f2937}.side-nav a.active{background:var(--color-brand-50);color:var(--color-brand-700);font-weight:var(--font-semibold)}.external-link{display:flex;align-items:center;justify-content:space-between;gap:var(--space-2);padding:var(--space-3) var(--space-3);border-radius:var(--radius-lg);border:1px solid #E5E7EB;font-size:13px;font-weight:var(--font-semibold);color:#374151;letter-spacing:.01em;transition:border-color var(--duration-fast) var(--ease-out),color var(--duration-fast) var(--ease-out),background-color var(--duration-fast) var(--ease-out)}.external-link:hover{border-color:var(--color-brand-400);color:var(--color-brand-700);background:var(--color-brand-50)}.workspace{min-width:0;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:var(--z-sticky);display:flex;align-items:center;justify-content:space-between;gap:var(--space-6);padding:var(--space-5) var(--space-8);background:#f8fafcd9;backdrop-filter:saturate(180%) blur(10px);-webkit-backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid #E5E7EB}.topbar-meta{display:flex;flex-direction:column;gap:2px;min-width:0}.topbar h1{font-size:18px;font-weight:var(--font-bold);color:#1f2937;letter-spacing:-.01em;line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbar-hint{font-size:13px;color:#6b7280;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.content{padding:var(--space-8);max-width:1280px;width:100%}.screen-loader{min-height:100vh;display:grid;place-items:center;color:#6b7280;font-weight:var(--font-semibold);background:#f8fafc}.page-stack{display:flex;flex-direction:column;gap:var(--space-6)}.page-header{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-6);flex-wrap:wrap}.page-header h2{font-size:28px;font-weight:var(--font-bold);color:#1f2937;letter-spacing:-.02em;line-height:1.2}.page-header>div>p:last-child{margin-top:var(--space-2);color:#6b7280;font-size:14px;max-width:620px;line-height:1.55}.actions{display:flex;align-items:center;gap:var(--space-2);flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);height:40px;padding:0 var(--space-4);border-radius:var(--radius-lg);font-size:14px;font-weight:var(--font-semibold);letter-spacing:.01em;white-space:nowrap;border:1px solid transparent;transition:all var(--duration-fast) var(--ease-out)}.button-primary{background:linear-gradient(180deg,var(--color-brand-300) 0%,var(--color-brand-500) 100%);color:#1f2937;border-color:#fff3;box-shadow:inset 0 1px #fff6,0 1px 2px #d9770626}.button-primary:hover{background:linear-gradient(180deg,var(--color-brand-200) 0%,var(--color-brand-500) 100%);transform:translateY(-1px)}.button-secondary{background:#fff;border-color:#e5e7eb;color:#374151}.button-secondary:hover{border-color:var(--color-brand-400);color:var(--color-brand-700);background:var(--color-brand-50)}.button-ghost{background:transparent;color:#6b7280}.button-ghost:hover{background:#f3f4f6;color:#1f2937}.button-google{width:100%;background:#fff;color:#1f2937;border-color:#d1d5db;font-weight:var(--font-semibold)}.button-google:hover{border-color:#9ca3af;background:#fafafa}.auth-divider{display:flex;align-items:center;gap:var(--space-3);color:#9ca3af;font-size:12px;letter-spacing:.06em;text-transform:uppercase;margin:var(--space-2) 0}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:#e5e7eb}.segmented{display:grid;grid-template-columns:repeat(2,1fr);gap:4px;padding:4px;border:1px solid #E5E7EB;border-radius:var(--radius-lg);background:#f9fafb}.segmented button{height:34px;border-radius:var(--radius-md);color:#6b7280;font-size:13px;font-weight:var(--font-semibold)}.segmented button.active{background:#fff;color:#1f2937;box-shadow:0 1px 2px #0000000f}.panel{background:#fff;border:1px solid #E5E7EB;border-radius:var(--radius-2xl);overflow:hidden}.panel-header{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);padding:var(--space-5) var(--space-6);border-bottom:1px solid #F3F4F6;flex-wrap:wrap}.panel-header h3{font-size:16px;font-weight:var(--font-bold);color:#1f2937;letter-spacing:-.01em}.panel-header p{margin-top:4px;font-size:13px;color:#6b7280}.form-panel{padding:var(--space-2) var(--space-6) var(--space-6)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--space-4)}.stat-card{position:relative;display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-5);background:#fff;border:1px solid #E5E7EB;border-radius:var(--radius-xl);transition:border-color var(--duration-fast) var(--ease-out)}.stat-card:hover{border-color:var(--color-brand-300)}.stat-card>svg{position:absolute;top:var(--space-4);right:var(--space-4);color:var(--color-brand-500);opacity:.65}.stat-card>span{font-size:12px;color:#6b7280;font-weight:var(--font-semibold);letter-spacing:.04em;text-transform:uppercase}.stat-card>strong{font-size:32px;font-weight:var(--font-extrabold);color:#1f2937;letter-spacing:-.02em;line-height:1.1;margin-top:var(--space-1)}.empty-panel{display:flex;flex-direction:column;align-items:flex-start;gap:var(--space-4);padding:var(--space-8) var(--space-6)}.empty-row{padding:var(--space-5) var(--space-6)}.registration-row{grid-template-columns:minmax(0,1fr) auto auto 20px}.registration-row:hover{background:#fafafa}.registration-row:hover .row-arrow{color:var(--color-brand-500)}.admin-row{grid-template-columns:minmax(0,1fr) auto auto;gap:var(--space-4)}.admin-row .row-actions{display:flex;align-items:center;gap:var(--space-2);flex-wrap:wrap}@media (max-width: 720px){.admin-row{grid-template-columns:1fr}.admin-row .row-actions{justify-content:flex-end}}.table-list{display:flex;flex-direction:column}.table-row{display:grid;align-items:center;gap:var(--space-4);padding:var(--space-4) var(--space-6);border-bottom:1px solid #F3F4F6;color:#374151;font-size:14px;transition:background-color var(--duration-fast) var(--ease-out)}.table-row:last-child{border-bottom:none}.olympiad-row{grid-template-columns:minmax(0,1fr) auto auto auto 20px}.olympiad-row:hover{background:#fafafa}.participant-row{grid-template-columns:minmax(0,1fr) auto auto}.row-title{font-weight:var(--font-semibold);color:#1f2937;font-size:15px;margin-bottom:2px}.row-subtitle{font-size:13px;color:#6b7280}.row-meta{display:flex;gap:var(--space-4);color:#6b7280;font-size:13px;align-items:center;flex-wrap:wrap}.row-meta>span{display:inline-flex;align-items:center;gap:6px;white-space:nowrap}.row-arrow{color:#d1d5db}.olympiad-row:hover .row-arrow{color:var(--color-brand-500)}.muted{color:#9ca3af;font-size:13px}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;color:#4b5563}.status{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:var(--radius-full);font-size:12px;font-weight:var(--font-semibold);letter-spacing:.01em;white-space:nowrap}.status-green{background:#dcfce7;color:#15803d}.status-amber{background:var(--color-brand-100);color:var(--color-brand-700)}.status-gray{background:#f3f4f6;color:#6b7280}.status-red{background:#fee2e2;color:#b91c1c}.invite-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:var(--space-3);padding:var(--space-5) var(--space-6)}.invite-item{display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-4);background:#f9fafb;border:1px solid #E5E7EB;border-radius:var(--radius-lg)}.invite-item>span{font-size:12px;font-weight:var(--font-semibold);color:#9ca3af;letter-spacing:.06em;text-transform:uppercase}.invite-item>code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;color:#1f2937;word-break:break-all}.inline-link{display:inline-flex;align-items:center;gap:var(--space-2);font-size:14px;font-weight:var(--font-medium);color:#6b7280;width:fit-content;transition:color var(--duration-fast) var(--ease-out)}.inline-link:hover{color:var(--color-brand-700)}.auth-layout{min-height:100vh;display:grid;place-items:center;padding:var(--space-6);background:radial-gradient(ellipse 600px 400px at top,rgba(251,191,36,.08),transparent 60%),#f8fafc}.auth-card{width:100%;max-width:420px;padding:var(--space-8);background:#fff;border:1px solid #E5E7EB;border-radius:var(--radius-2xl);box-shadow:0 1px 3px #0000000a,0 20px 40px -20px #0000001a;display:flex;flex-direction:column;gap:var(--space-3)}.auth-brand{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) 0;border-bottom:1px solid #F3F4F6;margin-bottom:var(--space-2)}.auth-brand>span{display:flex;flex-direction:column;line-height:1.2}.auth-brand strong{font-size:15px;font-weight:var(--font-bold);color:#1f2937;letter-spacing:-.01em}.auth-brand small{font-size:12px;color:#9ca3af;letter-spacing:.04em;text-transform:uppercase;font-weight:var(--font-medium)}.auth-card h2{font-size:24px;font-weight:var(--font-bold);color:#1f2937;letter-spacing:-.02em}.auth-card>p:nth-of-type(1){margin-top:var(--space-2);font-size:14px;color:#6b7280}.form-grid{margin-top:var(--space-4);display:flex;flex-direction:column;gap:var(--space-4)}.form-grid label{display:flex;flex-direction:column;gap:var(--space-2);font-size:13px;font-weight:var(--font-semibold);color:#374151}.form-grid input,.form-grid textarea,.form-grid select{padding:0 var(--space-4);border:1px solid #D1D5DB;border-radius:var(--radius-lg);font-size:14px;font-weight:var(--font-normal);font-family:inherit;background:#fff;transition:border-color var(--duration-fast) var(--ease-out)}.form-grid input,.form-grid select{height:44px}.form-grid textarea{padding:var(--space-3) var(--space-4);resize:vertical;min-height:96px}.form-grid input:focus,.form-grid textarea:focus,.form-grid select:focus{outline:none;border-color:var(--color-brand-400);box-shadow:0 0 0 3px #fbbf2426}.form-grid input::placeholder,.form-grid textarea::placeholder{color:#9ca3af}.form-grid .button{margin-top:var(--space-2);height:44px}.inline-form{display:grid;grid-template-columns:minmax(180px,1fr) minmax(140px,.5fr) auto auto;gap:var(--space-3);padding:var(--space-5) var(--space-6);border-bottom:1px solid #F3F4F6}.inline-form input,.inline-form select{height:40px;min-width:0;padding:0 var(--space-3);border:1px solid #D1D5DB;border-radius:var(--radius-lg);background:#fff;font-size:14px}.inline-form input:focus,.inline-form select:focus{outline:none;border-color:var(--color-brand-400);box-shadow:0 0 0 3px #fbbf2426}.notice{padding:var(--space-3) var(--space-4);border-radius:var(--radius-lg);font-size:14px;font-weight:var(--font-medium);border:1px solid transparent}.notice-error{background:#fef2f2;border-color:#fecaca;color:#991b1b}.notice-success{background:#f0fdf4;border-color:#bbf7d0;color:#166534}@media (max-width: 900px){.shell{grid-template-columns:1fr}.sidebar{position:static;height:auto;flex-direction:row;align-items:center;gap:var(--space-3);overflow-x:auto}.side-nav{flex-direction:row;padding-top:0;flex:1}.external-link{white-space:nowrap}.topbar{padding:var(--space-4) var(--space-5)}.content{padding:var(--space-5)}.olympiad-row,.registration-row{grid-template-columns:minmax(0,1fr) auto;row-gap:var(--space-2)}.olympiad-row>.row-meta,.olympiad-row>.status,.olympiad-row>.muted,.registration-row>.row-meta,.registration-row>.status{grid-column:1 / 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