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sans-serif;--font-hanzi:"Noto Serif SC", "Source Han Serif SC", "Lora", serif;--font-hanzi-sans:"Noto Sans SC", "Source Han Sans SC", "Inter", sans-serif;--font-mono:"JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;--fs-12:12px;--fs-14:14px;--fs-16:16px;--fs-18:18px;--fs-22:22px;--fs-28:28px;--fs-36:36px;--fs-48:48px;--fs-hanzi-xl:200px;--fs-hanzi-reveal:120px;--fs-hanzi-prompt-q:90px;--fs-pinyin-web:32px;--fs-pinyin-mobile:26px;--fs-prompt-german:28px;--lh-tight:1.15;--lh-snug:1.3;--lh-normal:1.5;--lh-loose:1.7;--sp-1:4px;--sp-2:8px;--sp-3:12px;--sp-4:16px;--sp-6:24px;--sp-8:32px;--sp-12:48px;--sp-16:64px;--radius-0:0px;--radius-sm:2px;--radius:4px;--radius-lg:8px;--border:1px solid var(--rule);--border-strong:1px solid var(--rule-strong);--border-ink:1px solid var(--ink);--shadow-none:none;--shadow-menu:0 8px 24px #1a171414;--shadow-pop:0 12px 32px #1a17141f;--ring:0 0 0 2px var(--paper), 0 0 0 4px var(--accent);--ease:cubic-bezier(.2, .8, .2, 1);--dur-fast:.12s;--dur:.15s;--dur-slow:.4s;--container-read:720px;--container-app:1120px}html,body{background:var(--bg);color:var(--fg);font-family:var(--font-serif);font-size:var(--fs-16);line-height:var(--lh-normal);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility}body:before{content:"";pointer-events:none;z-index:0;background-image:radial-gradient(#1a171407 1px,#0000 1.5px);background-size:6px 6px;position:fixed;inset:0}body>*{z-index:1;position:relative}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[role=button]:focus-visible,[role=tab]:focus-visible,[role=option]:focus-visible,[tabindex]:not([tabindex="-1"]):focus-visible{box-shadow:var(--ring);outline:none}.zk-fade-enter{animation:zk-fade-in .2s var(--ease) both}@keyframes zk-fade-in{0%{opacity:0}to{opacity:1}}.zk-card-advance-enter{animation:zk-card-slide-in .15s var(--ease) both}@keyframes zk-card-slide-in{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.zk-card-advance-leave{animation:zk-card-slide-out .15s var(--ease) both}@keyframes zk-card-slide-out{0%{opacity:1;transform:translate(0)}to{opacity:0;transform:translate(-20px)}}@media(prefers-reduced-motion:reduce){.zk-fade-enter,.zk-card-advance-enter,.zk-card-advance-leave{animation:none}}h1,.h1{font-family:var(--font-serif);font-size:var(--fs-48);line-height:var(--lh-tight);letter-spacing:-.01em;margin:0;font-weight:600}h2,.h2{font-family:var(--font-serif);font-size:var(--fs-36);line-height:var(--lh-tight);letter-spacing:-.005em;margin:0;font-weight:600}h3,.h3{font-family:var(--font-serif);font-size:var(--fs-28);line-height:var(--lh-snug);margin:0;font-weight:600}h4,.h4{font-family:var(--font-sans);font-size:var(--fs-18);line-height:var(--lh-snug);margin:0;font-weight:600}p,.p{font-family:var(--font-serif);font-size:var(--fs-16);line-height:var(--lh-loose);margin:0}.lead{font-family:var(--font-serif);font-size:var(--fs-22);line-height:var(--lh-snug);color:var(--ink-2)}.meta,small{font-family:var(--font-sans);font-size:var(--fs-12);color:var(--fg-muted);letter-spacing:.02em}.label{font-family:var(--font-sans);font-size:var(--fs-14);color:var(--ink);font-weight:500}.mono-label{font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.12em;color:var(--fg-muted);font-size:11px}code,.code,kbd{font-family:var(--font-mono);background:var(--paper-soft);border-radius:var(--radius-sm);border:1px solid var(--rule);padding:2px 6px;font-size:.92em}.hanzi{font-family:var(--font-hanzi);font-size:var(--fs-hanzi-xl);color:var(--ink);line-height:1}.pinyin{font-family:var(--font-serif);color:var(--ink-2);font-style:italic;font-size:var(--fs-22)}a{color:var(--accent);transition:border-color var(--dur) var(--ease);border-bottom:1px solid #0000;text-decoration:none}a:hover{border-bottom-color:var(--accent)}hr{border:0;border-top:var(--border);margin:var(--sp-6) 0}.zk-card{background:var(--card);border:var(--border);border-radius:var(--radius);padding:var(--sp-8)}.zk-card--active{border-left:3px solid var(--accent)}.zk-btn{font-family:var(--font-sans);font-size:var(--fs-14);border-radius:var(--radius);border:var(--border-strong);background:var(--card);color:var(--ink);cursor:pointer;transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease);padding:10px 16px;font-weight:500}.zk-btn:hover{background:var(--paper-soft);border-color:var(--ink)}.zk-btn:active{background:var(--rule)}.zk-btn:focus-visible{box-shadow:var(--ring);outline:none}.zk-btn--primary{background:var(--accent);color:#fff;border-color:var(--accent)}.zk-btn--primary:hover{background:var(--accent-ink);border-color:var(--accent-ink)}.zk-btn--primary:active{background:#7f1a18}.zk-btn--ghost{color:var(--ink-2);background:0 0;border-color:#0000}.zk-btn--ghost:hover{background:var(--paper-soft)}.zk-input{font-family:var(--font-sans);font-size:var(--fs-16);background:var(--card);border:var(--border-strong);border-radius:var(--radius-sm);color:var(--ink);width:100%;padding:10px 12px}.zk-input:focus-visible{box-shadow:var(--ring);border-color:var(--accent);outline:none}.zk-badge{font-family:var(--font-sans);font-size:var(--fs-12);background:var(--paper-soft);color:var(--ink-2);border-radius:999px;align-items:center;gap:4px;padding:2px 8px;font-weight:500;display:inline-flex}.zk-badge--accent{background:var(--accent-soft);color:var(--accent-ink)}.zk-badge--success{background:var(--success-soft);color:var(--success)}.zk-badge--warn{background:var(--warn-soft);color:var(--warn)}.zk-hanzi-hero{font-family:var(--font-hanzi);color:var(--ink);font-weight:500;line-height:1;display:inline-block;position:relative}.zk-hanzi-hero:after{content:"";background:var(--seal);width:42px;height:2px;position:absolute;bottom:-18px;left:50%;transform:translate(-50%)}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@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-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}