:root{--bg: #FAFAF7;--bg-2: #F4F2EC;--surface: #FFFFFF;--surface-2: #FAF9F6;--line: #ECE9E1;--line-2: #DCD7CB;--text: #14171F;--text-2: #4B505C;--text-3: #8B8E99;--text-mute: #B6B7BD;--primary: #6750E0;--primary-hover: #5B45D6;--primary-press: #4A37BD;--primary-soft: #EFEBFE;--primary-soft-2: #E3DCFC;--primary-ink: #2A1F73;--streak: #FF6B35;--streak-soft: #FFE6DA;--streak-deep: #C84415;--xp: #F5B82E;--xp-soft: #FFF1CC;--xp-deep: #B17D00;--heart: #FF4D6A;--heart-soft: #FFE1E7;--heart-deep: #BF2B45;--c-again: #EF4444;--c-again-soft: #FEE2E2;--c-again-deep: #B91C1C;--c-hard: #F59E0B;--c-hard-soft: #FEF3C7;--c-hard-deep: #B45309;--c-good: #22C55E;--c-good-soft: #DCFCE7;--c-good-deep: #15803D;--c-easy: #3B82F6;--c-easy-soft: #DBEAFE;--c-easy-deep: #1D4ED8;--sh-1: 0 1px 2px rgba(20, 23, 31, .05), 0 1px 1px rgba(20, 23, 31, .03);--sh-2: 0 1px 3px rgba(20, 23, 31, .06), 0 4px 12px rgba(20, 23, 31, .04);--sh-3: 0 4px 10px rgba(20, 23, 31, .06), 0 16px 32px rgba(20, 23, 31, .08);--sh-4: 0 12px 24px rgba(20, 23, 31, .08), 0 32px 64px -16px rgba(20, 23, 31, .16);--r-xs: 8px;--r-sm: 12px;--r-md: 16px;--r-lg: 22px;--r-xl: 28px;--r-pill: 999px;--font-ui: "Plus Jakarta Sans", "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;--font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, monospace;--ease-out: cubic-bezier(.16, 1, .3, 1);--ease-spring: cubic-bezier(.34, 1.56, .64, 1)}[data-theme=dark]{--bg: #0E1116;--bg-2: #161A22;--surface: #1A1F29;--surface-2: #232934;--line: #2C333F;--line-2: #3A4250;--text: #F6F7F9;--text-2: #C7CBD3;--text-3: #8B919C;--text-mute: #5B626E;--primary-soft: #221C4A;--primary-soft-2: #2C2563;--c-again-soft: #3A1717;--c-hard-soft: #3A2A0E;--c-good-soft: #14301E;--c-easy-soft: #14253F;--sh-1: 0 1px 2px rgba(0,0,0,.4);--sh-2: 0 4px 12px rgba(0,0,0,.4);--sh-3: 0 16px 32px rgba(0,0,0,.4);--sh-4: 0 24px 48px rgba(0,0,0,.6)}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:var(--font-ui);color:var(--text);background:var(--bg);font-feature-settings:"ss01","cv02","cv11";-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:15px;line-height:1.5;letter-spacing:-.005em}button{font:inherit;color:inherit;background:transparent;border:0;padding:0;cursor:pointer}input,textarea,select{font:inherit;color:inherit}a{color:inherit;text-decoration:none}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:999px;border:2px solid transparent;background-clip:padding-box}::-webkit-scrollbar-thumb:hover{background:var(--text-mute);border:2px solid transparent;background-clip:padding-box}.t-display{font-size:44px;line-height:1.05;font-weight:800;letter-spacing:-.025em}.t-h1{font-size:32px;line-height:1.1;font-weight:700;letter-spacing:-.02em}.t-h2{font-size:24px;line-height:1.15;font-weight:700;letter-spacing:-.015em}.t-h3{font-size:18px;line-height:1.25;font-weight:700;letter-spacing:-.01em}.t-body{font-size:15px;line-height:1.55;color:var(--text-2)}.t-sm{font-size:13px;line-height:1.45;color:var(--text-2)}.t-mute{color:var(--text-3)}.t-eyebrow{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-3)}.t-mono{font-family:var(--font-mono);font-size:12px;letter-spacing:0}.app{display:grid;grid-template-columns:260px 1fr;height:100%;min-height:100%;background:var(--bg)}.sidebar{background:var(--bg-2);border-right:1px solid var(--line);padding:22px 16px 18px;display:flex;flex-direction:column;gap:4px;position:sticky;top:0;height:100vh;overflow-y:auto}.sidebar .brand{display:flex;align-items:center;gap:10px;padding:4px 8px 18px}.sidebar .brand-mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--primary),#8E78F2);display:grid;place-items:center;color:#fff;font-weight:800;font-size:18px;box-shadow:0 4px 12px #6750e066,inset 0 1px #ffffff4d;flex-shrink:0}.sidebar .brand-name{font-weight:800;font-size:18px;letter-spacing:-.02em}.sidebar .brand-name small{display:block;font-size:10px;font-weight:600;color:var(--text-3);letter-spacing:.06em;text-transform:uppercase;margin-top:-2px}.nav-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:var(--r-sm);color:var(--text-2);font-weight:600;font-size:14px;cursor:pointer;transition:background .16s var(--ease-out),color .16s var(--ease-out);position:relative;width:100%;text-align:left}.nav-item .ni-glyph{width:22px;height:22px;display:grid;place-items:center;color:var(--text-3);flex-shrink:0}.nav-item:hover{background:var(--surface);color:var(--text)}.nav-item.on{background:var(--surface);color:var(--primary);box-shadow:var(--sh-1)}.nav-item.on .ni-glyph{color:var(--primary)}.nav-item .ni-badge{margin-left:auto;background:var(--primary);color:#fff;font-size:10px;font-weight:700;padding:2px 7px;border-radius:999px}.sidebar-sep{height:1px;background:var(--line);margin:12px 6px}.profile-card{margin-top:auto;display:flex;align-items:center;gap:10px;padding:10px;border-radius:var(--r-sm);background:var(--surface);border:1px solid var(--line)}.avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#FFB199,var(--streak));display:grid;place-items:center;color:#fff;font-weight:800;font-size:14px;border:2px solid var(--surface);box-shadow:0 2px 6px #ff6b354d;flex-shrink:0}.main{min-width:0;display:grid;grid-template-rows:auto 1fr;grid-template-columns:minmax(0,1fr);height:100vh;overflow:hidden}.topbar{min-width:0;overflow:hidden;display:flex;align-items:center;gap:14px;padding:14px 32px;background:var(--bg);border-bottom:1px solid var(--line)}.topbar .search{flex:1;max-width:460px;display:flex;align-items:center;gap:10px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-pill);padding:8px 16px;color:var(--text-3);transition:border-color .16s var(--ease-out),box-shadow .16s var(--ease-out)}.topbar .search:focus-within{border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-soft)}.topbar .search input{flex:1;border:0;background:transparent;outline:none;color:var(--text);font-size:14px}.topbar-spacer{flex:1}.topbar-right{display:flex;align-items:center;gap:10px}.content{overflow-y:auto;padding:28px 32px 48px}.stat-pill{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:var(--r-pill);background:var(--surface);border:1px solid var(--line);font-weight:700;font-size:13px;color:var(--text);box-shadow:var(--sh-1);white-space:nowrap}.stat-pill .icon{font-size:16px;line-height:1}.stat-pill.streak{color:var(--streak-deep);background:var(--streak-soft);border-color:transparent}.stat-pill.xp{color:var(--xp-deep);background:var(--xp-soft);border-color:transparent}.stat-pill.hearts{color:var(--heart-deep);background:var(--heart-soft);border-color:transparent}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;box-shadow:var(--sh-1)}.card.flat{box-shadow:none}.card.lift{box-shadow:var(--sh-2)}.card.hover{transition:transform .2s var(--ease-out),box-shadow .2s var(--ease-out)}.card.hover:hover{transform:translateY(-2px);box-shadow:var(--sh-3)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;font-size:14px;font-weight:700;border-radius:var(--r-sm);background:var(--surface);border:1.5px solid var(--line-2);color:var(--text);cursor:pointer;transition:transform 80ms var(--ease-out),background .16s var(--ease-out),box-shadow .16s var(--ease-out);-webkit-user-select:none;user-select:none;letter-spacing:-.01em;white-space:nowrap}.btn:hover{background:var(--bg-2)}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.chunky{border:0;box-shadow:inset 0 -3px #0000001a;padding-bottom:14px}.btn.chunky:active{box-shadow:inset 0 -1px #0000001a;transform:translateY(2px);padding-bottom:13px;padding-top:13px}.btn.primary{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:inset 0 -3px 0 var(--primary-press)}.btn.primary:hover{background:var(--primary-hover)}.btn.primary:active{box-shadow:inset 0 -1px 0 var(--primary-press)}.btn.lg{padding:14px 24px;font-size:15px;border-radius:var(--r-md)}.btn.xl{padding:16px 28px;font-size:16px;border-radius:var(--r-md)}.btn.ghost{background:transparent;border-color:transparent;box-shadow:none}.btn.ghost:hover{background:var(--bg-2)}.btn.block{width:100%}.field{display:flex;flex-direction:column;gap:6px}.field label{font-size:13px;font-weight:600;color:var(--text-2)}.input{font:inherit;font-size:15px;padding:12px 14px;background:var(--surface);border:1.5px solid var(--line-2);border-radius:var(--r-sm);color:var(--text);outline:none;width:100%;transition:border-color .16s var(--ease-out),box-shadow .16s var(--ease-out)}.input:focus{border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-soft)}.input::placeholder{color:var(--text-3)}.code-cell{flex:1 1 0;min-width:0;max-width:52px;height:56px;text-align:center;font-size:26px;font-weight:700;border:2px solid var(--line-2);border-radius:var(--r-sm);background:var(--surface);color:var(--text);outline:none;transition:border-color .16s var(--ease-out),box-shadow .16s var(--ease-out),transform .1s var(--ease-out);caret-color:var(--primary)}.code-cell:focus{border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-soft);transform:translateY(-1px)}.chip{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-pill);font-size:13px;font-weight:600;color:var(--text-2);cursor:pointer;transition:all .16s var(--ease-out)}.chip:hover{background:var(--bg-2)}.chip.on{background:var(--text);color:var(--bg);border-color:var(--text)}.chip.tone-learning.on{background:var(--c-again);border-color:var(--c-again)}.chip.tone-familiar.on{background:var(--c-hard);border-color:var(--c-hard)}.chip.tone-mastered.on{background:var(--c-good);border-color:var(--c-good)}.mastery{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.mastery:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--text-mute);flex-shrink:0}.mastery.learning{color:var(--c-again-deep)}.mastery.learning:before{background:var(--c-again)}.mastery.familiar{color:var(--c-hard-deep)}.mastery.familiar:before{background:var(--c-hard)}.mastery.mastered{color:var(--c-good-deep)}.mastery.mastered:before{background:var(--c-good)}.progress{height:12px;background:var(--bg-2);border-radius:999px;overflow:hidden;position:relative;border:1px solid var(--line)}.progress>.bar{height:100%;background:linear-gradient(to right,var(--primary),#8E78F2);border-radius:999px;transition:width .6s var(--ease-out);position:relative;box-shadow:inset 0 1px #fff6}.progress.xp>.bar{background:linear-gradient(to right,var(--xp),#FFD466)}.progress.streak>.bar{background:linear-gradient(to right,var(--streak),#FF9466)}.progress.thin{height:6px}.progress.thick{height:16px}.mring{--p: 50;--col: var(--primary);border-radius:50%;background:conic-gradient(var(--col) calc(var(--p) * 1%),var(--bg-2) 0);display:grid;place-items:center;position:relative}.mring:after{content:"";position:absolute;top:4px;right:4px;bottom:4px;left:4px;background:var(--surface);border-radius:50%}.mring>*{position:relative;z-index:1}@keyframes pop{0%{transform:scale(.94);opacity:0}60%{transform:scale(1.02);opacity:1}to{transform:scale(1);opacity:1}}@keyframes slidein{0%{transform:translateY(8px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes float-up{0%{transform:translate(-50%);opacity:0}20%{opacity:1}to{transform:translate(-50%,-60px);opacity:0}}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-6px)}80%{transform:translate(6px)}}@keyframes pulse-soft{0%,to{transform:scale(1)}50%{transform:scale(1.06)}}@keyframes fadein{0%{opacity:0}to{opacity:1}}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes slideup-strip{0%{transform:translateY(16px);opacity:.4}to{transform:translateY(0);opacity:1}}@keyframes dashfill{to{stroke-dashoffset:0}}.skel{background:linear-gradient(90deg,var(--bg-2) 25%,var(--line) 50%,var(--bg-2) 75%);background-size:200% 100%;animation:shimmer 1.6s ease-in-out infinite;border-radius:8px;flex-shrink:0}.anim-pop{animation:pop .32s var(--ease-spring) both}.anim-slidein{animation:slidein .36s var(--ease-out) both}.anim-pulse{animation:pulse-soft 1.6s ease-in-out infinite}.anim-fadein{animation:fadein .22s var(--ease-out) both}.scrim{position:fixed;top:0;right:0;bottom:0;left:0;background:#14171f66;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:80;animation:fadein .2s var(--ease-out) both}.modal{position:fixed;left:50%;top:50%;translate:-50% -50%;width:min(520px,calc(100% - 32px));max-height:calc(100dvh - 32px);overflow-y:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);padding:28px;z-index:81;box-shadow:var(--sh-4);animation:pop .28s var(--ease-spring) both}.row{display:flex}.col{display:flex;flex-direction:column}.center{display:flex;align-items:center;justify-content:center}.flex-1{flex:1;min-width:0}.gap-4{gap:4px}.gap-6{gap:6px}.gap-8{gap:8px}.gap-10{gap:10px}.gap-12{gap:12px}.gap-14{gap:14px}.gap-16{gap:16px}.gap-20{gap:20px}.gap-24{gap:24px}.gap-32{gap:32px}.wrap{flex-wrap:wrap}.ai-center{align-items:center}.ai-baseline{align-items:baseline}.jc-between{justify-content:space-between}.jc-center{justify-content:center}.divider{height:1px;background:var(--line)}.r-grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}.r-grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.r-grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.r-split{display:grid;grid-template-columns:1.4fr 1fr}.r-split-even{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.r-book-cover{display:grid;grid-template-columns:180px 1fr}.book-cover-img{aspect-ratio:2 / 3}@media(max-width:900px){.app{grid-template-columns:220px 1fr}.content{padding:22px 22px 40px}.topbar{padding:12px 22px;gap:8px}.add-word-label{display:none}.add-word-btn{padding:8px 10px}}@media(max-width:768px){.app{grid-template-columns:200px 1fr}.r-grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.r-grid-2,.r-split,.r-split-even,.r-book-cover{grid-template-columns:minmax(0,1fr)}.content{padding:20px 18px 36px}.topbar{padding:11px 18px;gap:8px}.topbar .search{max-width:180px}}@media(max-width:640px){.app{grid-template-columns:1fr}.main{height:100dvh}.sidebar{position:fixed;bottom:0;left:0;right:0;top:auto;height:62px;flex-direction:row;padding:4px 6px;border-right:0;border-top:1px solid var(--line);z-index:40;gap:0;overflow:visible}.sidebar .brand,.sidebar-sep,.sidebar .profile-card{display:none}.nav-item{flex:1;flex-direction:column;gap:2px;padding:5px 2px;font-size:10px;height:100%;justify-content:center;text-align:center;border-radius:8px}.nav-item .ni-glyph{margin:0 auto;width:18px;height:18px}.nav-item .ni-badge{display:none}.content{padding:18px 14px 82px}.topbar{padding:10px 14px;gap:6px}.topbar .search,.topbar-spacer{display:none}.topbar-right{gap:6px;margin-left:auto}.stat-pill{padding:6px 10px;font-size:12px;gap:5px}.add-word-label{display:none}.add-word-btn{padding:8px 10px}.r-grid-4,.r-grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.r-grid-2{grid-template-columns:minmax(0,1fr)}.t-display{font-size:30px}.t-h1{font-size:26px}.r-level-stages,.r-ratings{grid-template-columns:repeat(4,minmax(0,1fr))!important}.rating-btn{padding:10px 4px 12px!important}.rating-xp{display:none}.review-actions{padding:12px 16px 16px!important}.book-cover-img{aspect-ratio:3 / 2}.code-cell{height:50px;font-size:22px}.modal{padding:20px 18px;top:calc(50% - 31px);max-height:calc(100dvh - 94px)}}