:root{--background:#f8fafc;--surface:#fff;--text-main:#0f172a;--text-muted:#64748b;--primary:#ef4444;--primary-hover:#dc2626;--border:#e2e8f0;--hsk1:#3b82f6;--hsk2:#22c55e;--hsk3:#eab308;--hsk4:#f97316;--hsk5:#ec4899;--hsk6:#8b5cf6;--hsk7:#94a3b8;--radius-md:12px;--radius-lg:20px;--shadow-sm:0 1px 3px rgba(0,0,0,.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05)}@media (prefers-color-scheme:dark){:root{--background:#0f172a;--surface:#1e293b;--text-main:#f8fafc;--text-muted:#94a3b8;--border:#334155}}*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden;background-color:var(--background);color:var(--text-main);font-family:var(--font-inter),-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;transition:background-color .3s ease,color .3s ease}html{height:100%}body{min-height:100dvh}a{color:inherit;text-decoration:none}.hanzi{font-family:var(--font-noto-sans-sc),sans-serif}.container{max-width:1200px;margin:0 auto;padding:2rem calc(2rem + env(safe-area-inset-right)) calc(2rem + env(safe-area-inset-bottom)) calc(2rem + env(safe-area-inset-left))}.title{font-size:3rem;font-weight:700;text-align:center;margin-bottom:1rem;background:linear-gradient(135deg,var(--primary),#f59e0b);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.subtitle{color:var(--text-muted);font-size:1.25rem}.layout-header,.subtitle{text-align:center;margin-bottom:3rem}.layout-header{margin-top:2rem}.layout-footer{text-align:center;margin-top:4rem;padding:2rem 0;color:var(--text-muted);border-top:1px solid var(--border)}.home-card-link{text-decoration:none}.home-card-title{font-size:2rem;margin-bottom:1rem;color:var(--text-main)}.home-card-description{color:var(--text-muted);font-size:1.1rem}.level-list-heading{text-align:center;margin-bottom:2rem;font-size:2rem}.level-page-nav{display:flex;align-items:center;margin-bottom:2rem}.level-page-back-link{color:var(--text-muted);margin-right:auto;text-decoration:none;font-weight:500}.level-page-badge{color:#fff;padding:.5rem 1rem;border-radius:999px;font-weight:700}.level-page-heading{font-size:2.5rem;margin-bottom:1rem}.level-page-description{color:var(--text-muted);margin-bottom:3rem;font-size:1.2rem}.vocabulary-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));grid-gap:2rem;gap:2rem}.level-page-empty{text-align:center;color:var(--text-muted);margin-top:4rem}@media (max-width:640px){.container{padding:1.5rem calc(1rem + env(safe-area-inset-right)) calc(2rem + env(safe-area-inset-bottom)) calc(1rem + env(safe-area-inset-left))}.title{font-size:2.2rem;margin-bottom:.75rem}.subtitle{font-size:1.05rem;margin-bottom:2rem}.level-list-heading{font-size:1.7rem;margin-bottom:1.5rem}.level-page-nav{flex-direction:row;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem}.level-page-back-link{flex:1 1 auto;min-width:0}.level-page-badge{margin-left:auto;white-space:nowrap}.level-page-heading{font-size:2rem}.level-page-description{font-size:1.05rem;margin-bottom:2rem}.vocabulary-grid{grid-template-columns:1fr;gap:1.5rem}}.Navbar_navbar__fk_p7{position:-webkit-sticky;position:sticky;top:0;z-index:50;background-color:hsla(0,0%,100%,.8);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding-top:env(safe-area-inset-top)}@media (prefers-color-scheme:dark){.Navbar_navbar__fk_p7{background-color:rgba(30,41,59,.8)}}.Navbar_container__R6vwY{max-width:1200px;margin:0 auto;padding:.75rem calc(1.5rem + env(safe-area-inset-right)) .75rem calc(1.5rem + env(safe-area-inset-left));display:flex;justify-content:space-between;align-items:center}.Navbar_logo__UM0Ax{font-size:1.5rem;font-weight:700;display:flex;align-items:center;gap:.5rem;transition:opacity .2s ease;text-decoration:none;color:inherit}.Navbar_logo__UM0Ax:hover{opacity:.8}.Navbar_hanzi__OSv19{color:var(--primary);font-family:Noto Sans SC,sans-serif;font-size:1.8rem}.Navbar_links__lFeE5{display:flex;gap:1.5rem}.Navbar_link__9Nm3x{font-weight:500;color:var(--text-muted);transition:color .2s ease;padding:.5rem .75rem;border-radius:var(--radius-md);text-decoration:none}.Navbar_link__9Nm3x:hover{color:var(--primary);background-color:rgba(239,68,68,.1)}@media (max-width:640px){.Navbar_container__R6vwY{padding:.5rem calc(1rem + env(safe-area-inset-right)) .5rem calc(1rem + env(safe-area-inset-left));flex-direction:row;align-items:center;justify-content:space-between;gap:.5rem}.Navbar_logo__UM0Ax{font-size:1.25rem}.Navbar_hanzi__OSv19{font-size:1.6rem}.Navbar_links__lFeE5{display:flex;justify-content:flex-end;gap:.5rem}.Navbar_link__9Nm3x{text-align:center;border:1px solid var(--border);background:color-mix(in srgb,var(--surface) 90%,transparent);min-width:auto;padding-inline:.9rem;padding-block:.35rem;font-size:.85rem;border-radius:999px}}