:root{--bg-color:#fcfbf9;--surface-color:#fff;--text-main:#2d3748;--text-muted:#718096;--primary-color:#3b82f6;--primary-hover:#2563eb;--border-color:#e2e8f0;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -2px #0000000d;--font-ui:"Inter", system-ui, -apple-system, sans-serif;--font-reading:"Lora", Georgia, serif}[data-theme=dark]{--bg-color:#0f172a;--surface-color:#1e293b;--text-main:#f1f5f9;--text-muted:#94a3b8;--primary-color:#3b82f6;--primary-hover:#60a5fa;--border-color:#334155;--shadow-sm:0 1px 2px 0 #00000080;--shadow-md:0 4px 6px -1px #00000080;--shadow-lg:0 10px 15px -3px #00000080}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-ui);background-color:var(--bg-color);color:var(--text-main);min-height:100vh;line-height:1.5;transition:background-color .3s,color .3s}h1,h2,h3{font-family:var(--font-ui);font-weight:600}.header{background-color:var(--surface-color);border-bottom:1px solid var(--border-color);z-index:100;box-shadow:var(--shadow-sm);padding:1rem 2rem;transition:background-color .3s,border-color .3s;position:sticky;top:0}.header-content{justify-content:space-between;align-items:center;max-width:1000px;margin:0 auto;display:flex}.logo{font-family:var(--font-reading);letter-spacing:-.02em;color:var(--primary-color);font-size:1.5rem;font-weight:700}.controls{align-items:center;gap:1.5rem;display:flex}.api-key-input{border:1px solid var(--border-color);background-color:var(--bg-color);color:var(--text-main);font-family:var(--font-ui);border-radius:9999px;outline:none;width:200px;padding:.5rem 1rem;font-size:.875rem;transition:all .2s}.api-key-input:focus{border-color:var(--primary-color);box-shadow:0 0 0 2px #3b82f633}.icon-btn{color:var(--text-main);cursor:pointer;background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;padding:.5rem;transition:background-color .2s;display:flex}.icon-btn:hover{background-color:var(--border-color)}.primary-btn{background-color:var(--primary-color);color:#fff;cursor:pointer;box-shadow:var(--shadow-sm);border:none;border-radius:.5rem;padding:.75rem 1.5rem;font-size:1rem;font-weight:500;transition:background-color .2s,transform .1s}.primary-btn:hover{background-color:var(--primary-hover)}.primary-btn:active{transform:translateY(1px)}.secondary-btn{color:var(--text-muted);border:1px solid var(--border-color);cursor:pointer;background-color:#0000;border-radius:.5rem;padding:.5rem 1rem;font-size:.875rem;transition:all .2s}.secondary-btn:hover{color:var(--text-main);border-color:var(--text-muted)}.toggle-switch{cursor:pointer;align-items:center;gap:.75rem;display:flex;position:relative}.toggle-switch input{opacity:0;width:0;height:0}.slider{background-color:var(--border-color);border-radius:34px;width:44px;height:24px;transition:all .4s;position:relative}.slider:before{content:"";background-color:#fff;border-radius:50%;width:18px;height:18px;transition:all .4s;position:absolute;bottom:3px;left:3px}input:checked+.slider{background-color:var(--primary-color)}input:checked+.slider:before{transform:translate(20px)}.toggle-label{color:var(--text-muted);font-size:.875rem;font-weight:500}input:checked~.toggle-label{color:var(--primary-color)}.main-content{max-width:800px;margin:3rem auto;padding:0 1.5rem}.view{animation:.4s ease-out fadeIn;display:none}.view.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.input-container{flex-direction:column;gap:1.5rem;display:flex}.view-title{font-family:var(--font-reading);color:var(--text-main);font-size:2rem}textarea{border:1px solid var(--border-color);background-color:var(--surface-color);width:100%;height:400px;color:var(--text-main);font-family:var(--font-reading);resize:vertical;box-shadow:var(--shadow-sm);border-radius:1rem;outline:none;padding:1.5rem;font-size:1.25rem;line-height:1.6;transition:border-color .2s,box-shadow .2s}textarea:focus{border-color:var(--primary-color);box-shadow:0 0 0 3px #3b82f61a}.action-bar{justify-content:flex-end;display:flex}.reader-container{background-color:var(--surface-color);box-shadow:var(--shadow-md);border-radius:1rem;padding:3rem;transition:background-color .3s}.reader-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;margin-bottom:2rem;padding-bottom:1rem;display:flex}.reading-content{font-family:var(--font-reading);color:var(--text-main);white-space:pre-wrap;font-size:1.35rem;line-height:2}.sentence{cursor:pointer;border-radius:.25rem;padding:.1rem 0;transition:background-color .2s,color .2s}.sentence:hover{background-color:#3b82f61a}.sentence.loading-translation{background-color:#3b82f633;animation:1.5s infinite pulse}.sentence.active{box-shadow:0 2px 0 var(--primary-color);background-color:#3b82f626}@keyframes pulse{0%{opacity:.7}50%{opacity:1}to{opacity:.7}}.translation-tooltip{z-index:1000;background-color:var(--text-main);color:var(--bg-color);font-family:var(--font-ui);max-width:400px;box-shadow:var(--shadow-lg);pointer-events:none;opacity:0;border-radius:.5rem;padding:.75rem 1rem;font-size:1rem;transition:opacity .2s,transform .2s;position:absolute;transform:translateY(10px)}.translation-tooltip.show{opacity:1;transform:translateY(0)}.translation-tooltip:after{content:"";border-style:solid;border-width:5px;border-color:var(--text-main) transparent transparent transparent;margin-left:-5px;position:absolute;top:100%;left:50%}.loading{color:var(--primary-color);align-items:center;gap:.5rem;font-size:.875rem;font-weight:500;display:flex}.loading.hidden{display:none}.loading:after{content:"";border:2px solid var(--primary-color);border-top-color:#0000;border-radius:50%;width:1rem;height:1rem;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}ruby{ruby-align:center}rt{font-family:var(--font-ui);color:var(--primary-color);letter-spacing:.05em;font-size:.65rem;font-weight:600;transform:translateY(.3rem)}