:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f6f8fa;--surface:#fff;--surface-strong:#eef4f3;--ink:#182235;--muted:#667085;--line:#d8e0e7;--teal:#0f766e;--teal-dark:#115e59;--blue:#2f5f9f;--green:#24724c;--red:#b24242;--gold:#a76f20;--shadow:0 18px 50px #15223317;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;color:var(--ink);background:var(--bg);margin:0}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}.app-shell{grid-template-rows:auto 1fr;height:100vh;display:grid;overflow:hidden}.app-state{width:min(420px,100% - 32px);min-height:100vh;color:var(--muted);text-align:center;flex-direction:column;grid-row:1/-1;justify-content:center;align-items:center;gap:10px;margin:0 auto;display:flex}.app-state svg{width:42px;height:42px;color:var(--teal)}.app-state strong{color:var(--ink);font-size:1.1rem}.app-state span{line-height:1.45}.app-state-error svg{color:var(--red)}.topbar{border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#ffffffeb;justify-content:space-between;align-items:center;gap:20px;padding:18px 28px;display:flex}.brand{align-items:center;gap:12px;min-width:0;display:flex}.brand svg{width:34px;height:34px;color:var(--teal)}.brand h1{letter-spacing:0;margin:0;font-size:1.2rem;line-height:1.15}.brand p{color:var(--muted);margin:3px 0 0;font-size:.9rem}.stats-strip{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:10px;display:flex}.stats-strip span{border:1px solid var(--line);background:var(--surface);min-width:94px;color:var(--muted);text-align:center;border-radius:8px;padding:8px 10px;font-size:.86rem}.stats-strip strong{color:var(--ink)}.workspace{grid-template-columns:290px minmax(0,1fr) 340px;gap:18px;width:min(1440px,100%);min-height:0;margin:0 auto;padding:18px;display:grid;overflow:hidden}.side-panel,.deck-panel,.study-area{min-width:0;min-height:0}.side-panel,.deck-panel{border:1px solid var(--line);background:var(--surface);border-radius:8px;flex-direction:column;gap:16px;padding:16px;display:flex}.search-box{border:1px solid var(--line);background:#fbfcfd;border-radius:8px;align-items:center;gap:8px;height:42px;padding:0 12px;display:flex}.search-box svg{width:18px;height:18px;color:var(--muted);flex:none}.search-box input{width:100%;min-width:0;color:var(--ink);background:0 0;border:0;outline:0}.control-block{flex-direction:column;gap:10px;display:flex}.block-title,.deck-heading,.eyebrow{color:var(--muted);letter-spacing:0;text-transform:uppercase;font-size:.78rem;font-weight:700}.block-title{align-items:center;gap:6px;display:flex}.block-title svg{width:16px;height:16px}.segmented-control,.filter-grid{gap:6px;display:grid}.segmented-control{grid-template-columns:repeat(3,minmax(0,1fr))}.filter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.segmented-control button,.filter-grid button{border:1px solid var(--line);min-height:36px;color:var(--ink);white-space:nowrap;background:#fbfcfd;border-radius:8px;font-size:.88rem}.segmented-control button.active,.filter-grid button.active{border-color:var(--teal);background:var(--surface-strong);color:var(--teal-dark);font-weight:700}.import-block dl{gap:8px;margin:0;display:grid}.import-block dl div{border-bottom:1px solid var(--line);justify-content:space-between;gap:10px;padding-bottom:8px;display:flex}.import-block dt,.import-block dd{margin:0;font-size:.88rem}.import-block dt{color:var(--muted)}.import-block dd{color:var(--ink);text-align:right;overflow-wrap:anywhere}.sentence-guide{gap:8px}.sentence-guide p{color:var(--muted);margin:0;font-size:.86rem;line-height:1.45}.sentence-order{flex-wrap:wrap;gap:6px;display:flex}.sentence-order span{border:1px solid var(--line);color:var(--teal-dark);white-space:nowrap;background:#fbfcfd;border-radius:8px;padding:6px 8px;font-size:.78rem;font-weight:700}.study-area{grid-template-rows:auto minmax(420px,1fr) auto;gap:14px;display:grid}.study-toolbar{justify-content:space-between;align-items:center;gap:12px;min-height:50px;display:flex}.study-toolbar strong,.deck-heading strong{margin-top:2px;display:block}.toolbar-actions,.study-actions{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.flashcard,.empty-state{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow);border-radius:8px}.flashcard{grid-template-rows:auto minmax(190px,1fr) auto auto;gap:16px;min-height:420px;padding:20px;display:grid}.card-meta,.progress-pills{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.card-meta span,.progress-pills span{border:1px solid var(--line);color:var(--muted);white-space:nowrap;background:#fbfcfd;border-radius:8px;padding:5px 8px;font-size:.78rem}.front-face{text-align:center;place-items:center;min-height:190px;display:grid}.front-face p{letter-spacing:0;overflow-wrap:anywhere;white-space:pre-line;max-width:900px;margin:0;font-size:clamp(1.7rem,4.5vw,3.5rem);line-height:1.18}.answer-face{border-top:1px solid var(--line);gap:8px;padding-top:14px;display:grid}.answer-primary,.answer-secondary,.answer-label,.raw-line{overflow-wrap:anywhere;white-space:pre-line;margin:0}.answer-primary{font-size:clamp(1.25rem,2.8vw,2rem);line-height:1.35}.answer-secondary{color:var(--blue);font-size:1.02rem;line-height:1.45}.variant-list,.example-list,.pattern-list,.note-list{border-top:1px solid var(--line);gap:8px;margin-top:4px;padding-top:10px;display:grid}.answer-label{color:var(--muted);letter-spacing:0;text-transform:uppercase;font-size:.76rem;font-weight:700}.variant-row,.example-row,.pattern-row{border:1px solid var(--line);background:#fbfcfd;border-radius:8px;gap:3px;padding:8px 10px;display:grid}.variant-row strong,.example-row strong,.pattern-row strong{font-size:1.05rem;line-height:1.4}.variant-row span,.example-row span,.pattern-row span{color:var(--blue);font-size:.92rem;line-height:1.35}.example-row em,.pattern-row em{color:var(--muted);font-size:.9rem;font-style:normal;line-height:1.35}.answer-note{border-left:3px solid var(--gold);color:var(--ink);background:#fffaf0;border-radius:0 8px 8px 0;margin:0;padding:8px 10px;font-size:.9rem;line-height:1.45}.answer-note.grammar{border-left-color:var(--teal);background:var(--surface-strong)}.raw-line{color:var(--muted);font-size:.9rem;line-height:1.45}.study-actions{justify-content:center}.icon-button,.primary-action,.danger-action,.success-action{border:1px solid var(--line);min-height:42px;color:var(--ink);background:var(--surface);white-space:nowrap;border-radius:8px;justify-content:center;align-items:center;gap:8px;display:inline-flex}.icon-button{width:42px;padding:0}.icon-button svg,.primary-action svg,.danger-action svg,.success-action svg{flex:none;width:18px;height:18px}.primary-action,.danger-action,.success-action{min-width:96px;padding:0 14px}.primary-action{border-color:var(--teal);background:var(--teal);color:#fff}.danger-action{color:var(--red);border-color:#b2424252}.success-action{color:var(--green);border-color:#24724c57}.empty-state{min-height:420px;color:var(--muted);align-content:center;place-items:center;gap:4px;display:grid}.empty-state strong{color:var(--ink)}.deck-heading{justify-content:space-between;align-items:center;gap:8px;display:flex}.deck-list{gap:8px;min-height:0;padding-right:2px;display:grid;overflow:auto}.deck-row{border:1px solid var(--line);width:100%;min-height:62px;color:var(--ink);text-align:left;background:#fbfcfd;border-radius:8px;gap:4px;padding:10px;display:grid}.deck-row.active{border-color:var(--teal);background:var(--surface-strong)}.deck-row.mastered{border-left:4px solid var(--green)}.deck-row-main,.deck-row-sub{text-overflow:ellipsis;white-space:nowrap;min-width:0;display:block;overflow:hidden}.deck-row-main{font-size:.9rem;font-weight:700}.deck-row-sub{color:var(--muted);font-size:.82rem}[dir=auto]{unicode-bidi:plaintext}@media (width<=1180px){.workspace{grid-template-columns:260px minmax(0,1fr)}.deck-panel{grid-column:1/-1;max-height:360px}.deck-list{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=760px){.app-shell{height:auto;min-height:100vh;overflow:visible}.topbar{flex-direction:column;align-items:flex-start;padding:16px}.stats-strip{justify-content:stretch;width:100%}.stats-strip span{flex:94px}.workspace{grid-template-columns:1fr;padding:12px;overflow:visible}.study-area{grid-template-rows:auto minmax(360px,auto) auto}.flashcard,.empty-state{min-height:360px}.front-face p{font-size:clamp(1.45rem,9vw,2.65rem)}.study-actions{justify-content:stretch}.primary-action,.danger-action,.success-action{flex:110px}.deck-list{grid-template-columns:1fr}}