@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap";@layer properties,theme,base,components,utilities;@layer theme{:root,:host{--font-sans:ui-sans-serif,system-ui,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";--font-mono:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;--color-amber-50:oklch(98.7% .022 95.277);--color-amber-400:oklch(82.8% .189 84.429);--color-amber-600:oklch(66.6% .179 58.318);--color-amber-900:oklch(41.4% .112 45.904);--color-green-50:oklch(98.2% .018 155.826);--color-green-400:oklch(79.2% .209 151.711);--color-green-600:oklch(62.7% .194 149.214);--color-green-900:oklch(39.3% .095 152.535);--color-gray-100:oklch(96.7% .003 264.542);--color-gray-400:oklch(70.7% .022 261.325);--color-gray-500:oklch(55.1% .027 264.364);--color-gray-800:oklch(27.8% .033 256.848);--spacing:.25rem;--container-sm:24rem;--container-md:28rem;--container-2xl:42rem;--text-xs:.75rem;--text-xs--line-height:calc(1/.75);--text-sm:.875rem;--text-sm--line-height:calc(1.25/.875);--text-base:1rem;--text-base--line-height: 1.5 ;--text-lg:1.125rem;--text-lg--line-height:calc(1.75/1.125);--text-xl:1.25rem;--text-xl--line-height:calc(1.75/1.25);--text-2xl:1.5rem;--text-2xl--line-height:calc(2/1.5);--text-3xl:1.875rem;--text-3xl--line-height: 1.2 ;--text-4xl:2.25rem;--text-4xl--line-height:calc(2.5/2.25);--text-5xl:3rem;--text-5xl--line-height:1;--font-weight-medium:500;--font-weight-semibold:600;--font-weight-bold:700;--radius-lg:.5rem;--shadow-lg:0 10px 15px -3px #0000001a,0 4px 6px -4px #0000001a;--ease-in-out:cubic-bezier(.4,0,.2,1);--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,ui-sans-serif,system-ui,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring{outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab,red,red)){::placeholder{color:color-mix(in oklab,currentcolor 50%,transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer utilities{.absolute{position:absolute}.static{position:static}.top-3{top:calc(var(--spacing)*3)}.right-3{right:calc(var(--spacing)*3)}.mx-auto{margin-inline:auto}.mt-4{margin-top:calc(var(--spacing)*4)}.mr-1{margin-right:calc(var(--spacing)*1)}.mb-1{margin-bottom:calc(var(--spacing)*1)}.mb-2{margin-bottom:calc(var(--spacing)*2)}.mb-3{margin-bottom:calc(var(--spacing)*3)}.mb-4{margin-bottom:calc(var(--spacing)*4)}.mb-6{margin-bottom:calc(var(--spacing)*6)}.mb-8{margin-bottom:calc(var(--spacing)*8)}.ml-2{margin-left:calc(var(--spacing)*2)}.flex{display:flex}.grid{display:grid}.inline{display:inline}.h-12{height:calc(var(--spacing)*12)}.h-16{height:calc(var(--spacing)*16)}.h-20{height:calc(var(--spacing)*20)}.h-72{height:calc(var(--spacing)*72)}.h-full{height:100%}.min-h-screen{min-height:100vh}.w-12{width:calc(var(--spacing)*12)}.w-16{width:calc(var(--spacing)*16)}.w-20{width:calc(var(--spacing)*20)}.w-full{width:100%}.max-w-2xl{max-width:var(--container-2xl)}.max-w-md{max-width:var(--container-md)}.max-w-sm{max-width:var(--container-sm)}.flex-1{flex:1}.transform{transform:var(--tw-rotate-x,)var(--tw-rotate-y,)var(--tw-rotate-z,)var(--tw-skew-x,)var(--tw-skew-y,)}.cursor-pointer{cursor:pointer}.grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-1{gap:calc(var(--spacing)*1)}.gap-2{gap:calc(var(--spacing)*2)}.gap-3{gap:calc(var(--spacing)*3)}.gap-4{gap:calc(var(--spacing)*4)}:where(.space-y-3>:not(:last-child)){--tw-space-y-reverse:0;margin-block-start:calc(calc(var(--spacing)*3)*var(--tw-space-y-reverse));margin-block-end:calc(calc(var(--spacing)*3)*calc(1 - var(--tw-space-y-reverse)))}.rounded{border-radius:.25rem}.rounded-full{border-radius:3.40282e38px}.rounded-lg{border-radius:var(--radius-lg)}.bg-amber-50{background-color:var(--color-amber-50)}.bg-gray-100{background-color:var(--color-gray-100)}.bg-green-50{background-color:var(--color-green-50)}.object-contain{object-fit:contain}.p-3{padding:calc(var(--spacing)*3)}.p-5{padding:calc(var(--spacing)*5)}.p-6{padding:calc(var(--spacing)*6)}.p-8{padding:calc(var(--spacing)*8)}.px-2{padding-inline:calc(var(--spacing)*2)}.px-4{padding-inline:calc(var(--spacing)*4)}.py-0\.5{padding-block:calc(var(--spacing)*.5)}.py-4{padding-block:calc(var(--spacing)*4)}.pt-4{padding-top:calc(var(--spacing)*4)}.pb-10{padding-bottom:calc(var(--spacing)*10)}.pb-20{padding-bottom:calc(var(--spacing)*20)}.text-center{text-align:center}.text-left{text-align:left}.text-2xl{font-size:var(--text-2xl);line-height:var(--tw-leading,var(--text-2xl--line-height))}.text-3xl{font-size:var(--text-3xl);line-height:var(--tw-leading,var(--text-3xl--line-height))}.text-4xl{font-size:var(--text-4xl);line-height:var(--tw-leading,var(--text-4xl--line-height))}.text-5xl{font-size:var(--text-5xl);line-height:var(--tw-leading,var(--text-5xl--line-height))}.text-base{font-size:var(--text-base);line-height:var(--tw-leading,var(--text-base--line-height))}.text-lg{font-size:var(--text-lg);line-height:var(--tw-leading,var(--text-lg--line-height))}.text-sm{font-size:var(--text-sm);line-height:var(--tw-leading,var(--text-sm--line-height))}.text-xl{font-size:var(--text-xl);line-height:var(--tw-leading,var(--text-xl--line-height))}.text-xs{font-size:var(--text-xs);line-height:var(--tw-leading,var(--text-xs--line-height))}.font-bold{--tw-font-weight:var(--font-weight-bold);font-weight:var(--font-weight-bold)}.font-medium{--tw-font-weight:var(--font-weight-medium);font-weight:var(--font-weight-medium)}.font-semibold{--tw-font-weight:var(--font-weight-semibold);font-weight:var(--font-weight-semibold)}.text-amber-600{color:var(--color-amber-600)}.text-gray-500{color:var(--color-gray-500)}.text-green-600{color:var(--color-green-600)}.ease-in-out{--tw-ease:var(--ease-in-out);transition-timing-function:var(--ease-in-out)}@media(prefers-color-scheme:dark){.dark\:bg-amber-900\/30{background-color:#7b33064d}@supports (color:color-mix(in lab,red,red)){.dark\:bg-amber-900\/30{background-color:color-mix(in oklab,var(--color-amber-900)30%,transparent)}}.dark\:bg-gray-800{background-color:var(--color-gray-800)}.dark\:bg-green-900\/30{background-color:#0d542b4d}@supports (color:color-mix(in lab,red,red)){.dark\:bg-green-900\/30{background-color:color-mix(in oklab,var(--color-green-900)30%,transparent)}}.dark\:text-amber-400{color:var(--color-amber-400)}.dark\:text-gray-400{color:var(--color-gray-400)}.dark\:text-green-400{color:var(--color-green-400)}}}:root{--bg-primary:#fff;--bg-secondary:#f7f6f3;--bg-tertiary:#fff;--text-primary:#37352f;--text-secondary:#787774;--text-tertiary:#9b9a97;--border-color:#37352f17;--border-hover:#37352f29;--card-bg:#fff;--card-hover:#f7f6f3;--accent:#2eaadc;--accent-soft:#2eaadc1a;--success:#0f7b6c;--success-bg:#0f7b6c1a;--error:#e03e3e;--error-bg:#e03e3e1a;--shadow:0 1px 3px #0000000a,0 1px 2px #0000000f;--shadow-lg:0 4px 6px #0000000d,0 10px 20px #0000000a}.dark{--bg-primary:#191919;--bg-secondary:#202020;--bg-tertiary:#2f2f2f;--text-primary:#ebebeb;--text-secondary:#9b9a97;--text-tertiary:#6b6b6b;--border-color:#ffffff17;--border-hover:#ffffff29;--card-bg:#252525;--card-hover:#2f2f2f;--accent:#529cca;--accent-soft:#529cca26;--success:#4dab9a;--success-bg:#4dab9a26;--error:#ff7369;--error-bg:#ff736926;--shadow:0 1px 3px #0003;--shadow-lg:0 4px 6px #0000004d}*{box-sizing:border-box}body{background:var(--bg-primary);min-height:100vh;color:var(--text-primary);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,sans-serif;transition:background .2s,color .2s}#root{min-height:100vh}.card{background:var(--card-bg);border:1px solid var(--border-color);box-shadow:var(--shadow);border-radius:8px;transition:all .2s}.card:hover{box-shadow:var(--shadow-lg);border-color:var(--border-hover)}.card-flat{background:var(--bg-secondary);border-radius:8px;transition:all .15s}.card-flat:hover{background:var(--card-hover)}.btn{background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-primary);cursor:pointer;border-radius:6px;align-items:center;gap:6px;padding:8px 14px;font-size:14px;font-weight:500;transition:all .15s;display:inline-flex}.btn:hover{background:var(--card-hover);border-color:var(--border-hover)}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn-primary:hover{opacity:.9;background:var(--accent);border-color:var(--accent)}.btn-ghost{background:0 0;border-color:#0000}.btn-ghost:hover{background:var(--bg-secondary);border-color:#0000}.card-container{perspective:1000px}.card-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);position:relative}.card-inner.flipped{transform:rotateY(180deg)}.card-face{backface-visibility:hidden;width:100%;height:100%;position:absolute}.card-back{transform:rotateY(180deg)}input[type=text]{background:var(--bg-primary);border:1px solid var(--border-color);color:var(--text-primary);border-radius:6px;outline:none;width:100%;padding:10px 12px;font-size:15px;transition:all .15s}input[type=text]:focus{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-soft)}input[type=text]::placeholder{color:var(--text-tertiary)}.progress-bar{background:var(--bg-secondary);border-radius:2px;height:4px;overflow:hidden}.progress-fill{background:var(--accent);border-radius:2px;height:100%;transition:width .4s}.option-btn{background:var(--bg-primary);border:1px solid var(--border-color);text-align:center;cursor:pointer;color:var(--text-primary);border-radius:8px;padding:16px;transition:all .15s}.option-btn:hover:not(:disabled){background:var(--bg-secondary);border-color:var(--border-hover)}.option-btn.correct{background:var(--success-bg);border-color:var(--success);color:var(--success)}.option-btn.incorrect{background:var(--error-bg);border-color:var(--error);color:var(--error)}.feedback-correct{background:var(--success-bg);border:1px solid var(--success);color:var(--success);border-radius:6px;padding:12px 16px}.feedback-incorrect{background:var(--error-bg);border:1px solid var(--error);color:var(--error);border-radius:6px;padding:12px 16px}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--border-hover)}.chinese-text{font-family:Noto Sans SC,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}.kbd{background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-secondary);border-radius:4px;padding:2px 6px;font-family:ui-monospace,monospace;font-size:11px}.theme-toggle{cursor:pointer;width:40px;height:40px;color:var(--text-secondary);background:0 0;border:none;border-radius:8px;justify-content:center;align-items:center;transition:all .15s;display:flex}.theme-toggle:hover{background:var(--bg-secondary);color:var(--text-primary)}.streak-badge{color:#fff;background:linear-gradient(135deg,#ff9a56,#ff6b6b);border-radius:20px;align-items:center;gap:4px;padding:4px 10px;font-size:13px;font-weight:600;display:inline-flex}.override-btn{border:1px dashed var(--border-color);color:var(--text-secondary);cursor:pointer;background:0 0;border-radius:6px;padding:8px 12px;font-size:13px;transition:all .15s}.override-btn:hover{border-color:var(--success);color:var(--success);background:var(--success-bg)}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-rotate-x:initial;--tw-rotate-y:initial;--tw-rotate-z:initial;--tw-skew-x:initial;--tw-skew-y:initial;--tw-space-y-reverse:0;--tw-font-weight:initial;--tw-ease:initial}}}