:root{color-scheme:light;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5;color:#1c2430;background:#eef2ef;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}button{font:inherit}.app-shell{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(130deg,#ffffffdb,#eef2efad),radial-gradient(circle at 12% 12%,rgba(60,128,104,.16),transparent 34%),radial-gradient(circle at 82% 18%,rgba(221,158,70,.18),transparent 30%),#eef2ef}.study-surface{width:min(920px,100%);display:grid;gap:20px}.top-bar{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.eyebrow{margin:0 0 4px;font-size:.75rem;font-weight:800;letter-spacing:0;color:#2f6d59;text-transform:uppercase}h1{max-width:720px;margin:0;color:#13251f;font-size:clamp(1.75rem,3vw,3rem);line-height:1.05;letter-spacing:0}.icon-button,.primary-action,.rating-button{min-height:44px;border:0;border-radius:8px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:10px;font-weight:800;transition:transform .15s ease,box-shadow .15s ease,background-color .15s ease}.icon-button{width:44px;flex:0 0 auto;color:#31433d;background:#ffffffc7;box-shadow:0 10px 28px #23362f1f}.icon-button:hover,.primary-action:hover,.rating-button:hover{transform:translateY(-1px)}.stats-wrap{display:grid;gap:10px}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.stat{min-width:0;border:1px solid rgba(39,69,59,.12);border-radius:8px;padding:12px;background:#ffffffb8}.stat span{display:block;color:#61736d;font-size:.78rem;font-weight:700}.stat strong{display:block;color:#182720;font-size:1.25rem;line-height:1.1}.progress-track{height:8px;overflow:hidden;border-radius:999px;background:#21352d21}.progress-track span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,#2f7a61,#d99a3e)}.flashcard{min-height:500px;display:grid;grid-template-rows:auto minmax(128px,auto) minmax(128px,auto) auto;gap:16px;border:1px solid rgba(28,54,45,.12);border-radius:8px;padding:clamp(18px,4vw,34px);background:#ffffffeb;box-shadow:0 22px 60px #2b3b3626}.card-meta{min-height:28px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}.card-meta span{max-width:100%;overflow-wrap:anywhere;border-radius:999px;padding:4px 10px;color:#43534d;background:#edf2ee;font-size:.75rem;font-weight:800}.card-content{min-width:0;display:grid;align-items:center;border-radius:8px;padding:clamp(18px,4vw,32px);overflow-wrap:anywhere}.front{color:#10271e;background:#f8faf7;border:1px solid rgba(38,87,67,.14)}.answer{color:#27332e;background:#f4efe5;border:1px dashed rgba(154,103,34,.34)}.answer.visible{border-style:solid}.answer-placeholder{color:#9a7242;font-weight:800;text-align:center}.anki-html{width:100%;min-width:0;text-align:center;font-size:clamp(1.45rem,2.4vw,2.5rem);line-height:1.22}.anki-html *{max-width:100%}.anki-html img{display:block;width:auto;max-width:min(100%,520px);max-height:260px;margin:12px auto;object-fit:contain}.anki-html audio{width:min(100%,360px);margin:12px auto 0}.anki-html .detail-line{margin-top:8px;color:#69756f;font-size:.58em;line-height:1.35}.primary-action{width:100%;color:#fff;background:#276b56;box-shadow:0 12px 26px #276b5642}.rating-actions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.rating-button{width:100%;color:#17211d;padding:0 12px}.rating-button.hard{background:#f1c0b5}.rating-button.medium{background:#f2d492}.rating-button.easy{background:#addcc3}.status{min-height:260px;display:grid;place-items:center;gap:12px;border-radius:8px;padding:24px;color:#31433d;background:#ffffffd1;text-align:center;font-weight:800}.spinner{width:28px;height:28px;border:3px solid rgba(47,122,97,.18);border-top-color:#2f7a61;border-radius:50%;animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:680px){.app-shell{padding:16px;place-items:stretch}.study-surface{align-content:start}.top-bar{align-items:center}h1{font-size:1.6rem}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.flashcard{min-height:calc(100vh - 250px);grid-template-rows:auto minmax(120px,auto) minmax(110px,auto) auto}.anki-html{font-size:1.45rem}.rating-actions{grid-template-columns:1fr}}