:root{--bg: #f3efe6;--bg-accent: #e7f0ea;--surface: #fffdf8;--ink: #1c2b24;--muted: #5d6b63;--line: #d5ddd6;--brand: #1f6b4a;--brand-soft: #d8eee3;--danger: #b42318;--ok: #1f6b4a;--shadow: 0 10px 30px rgba(28, 43, 36, .08);--radius: 18px;font-family:Noto Sans SC,Noto Sans JP,sans-serif;color:var(--ink);background:radial-gradient(circle at top left,#dff0e6 0%,transparent 40%),radial-gradient(circle at top right,#f7e7d4 0%,transparent 35%),var(--bg);line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}html,body,#app{min-height:100%}body{margin:0}a{color:inherit;text-decoration:none}button,input,select{font:inherit}.container{width:min(960px,calc(100% - 2rem));margin:0 auto}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topnav{position:sticky;top:0;z-index:20;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#f3efe6e0;border-bottom:1px solid var(--line)}.topnav-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.9rem 0}.brand{font-weight:700;letter-spacing:.02em;font-size:1.05rem}.nav-links{display:flex;gap:.35rem;flex-wrap:wrap}.nav-links a{padding:.45rem .75rem;border-radius:999px;color:var(--muted)}.nav-links a.router-link-active{background:var(--brand-soft);color:var(--brand);font-weight:600}.main{flex:1;padding:1.5rem 0 3rem}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.25rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;border:none;border-radius:999px;padding:.7rem 1.2rem;cursor:pointer;background:var(--brand);color:#fff;font-weight:600;transition:transform .15s ease,opacity .15s ease}.btn:hover{transform:translateY(-1px)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn.secondary{background:#fff;color:var(--ink);border:1px solid var(--line)}.btn.ghost{background:transparent;color:var(--brand);border:1px solid var(--brand-soft)}.field{display:flex;flex-direction:column;gap:.35rem;margin-bottom:1rem}.field input,.field select{border:1px solid var(--line);border-radius:12px;padding:.7rem .85rem;background:#fff}.muted{color:var(--muted)}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem}.progress-bar{height:10px;background:#e6ebe7;border-radius:999px;overflow:hidden}.progress-bar>span{display:block;height:100%;background:linear-gradient(90deg,#1f6b4a,#3d9b72)}.tag{display:inline-flex;align-items:center;padding:.15rem .55rem;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-size:.8rem}.word-lemma{font-family:Noto Sans JP,sans-serif;font-size:2rem;font-weight:700;line-height:1.2}.reading{font-family:Noto Sans JP,sans-serif;color:var(--muted)}.error{color:var(--danger);margin:.5rem 0}@media (max-width: 720px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.nav-links{gap:.15rem}.nav-links a{padding:.4rem .55rem;font-size:.9rem}.word-lemma{font-size:1.7rem}}