*{box-sizing:border-box;margin:0;padding:0}body{font-family:"Helvetica Neue",Helvetica,Arial,sans-serif,"Noto Serif SC","Source Han Serif SC","PingFang SC","Songti SC",SimSun,STSong,serif;font-weight:400;background:var(--body-bg) url(../images/bg.svg);background-size:100px 50px;color:var(--text-color);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}:root{--primary-color:#244f3d;--secondary-color:#75d1ae;--card-bg:#fff;--board-bg:#d9f3ea;--input-bg:#fff;--body-bg:#fafafa;--strong-color:#000;--reverse-color:#fff;--text-color:#333;--text-muted:#666;--border-color:#ddd;--border-light:#ccc;--border-dark:#aaa;--highlight-color:#ffc107;--danger-color:#dc3545;--info-color:#007bff;--shadow-light:rgba(0, 0, 0, 0.05);--shadow-strong:rgba(0, 0, 0, 0.18);--skeleton-base:#e5e5e5;--skeleton-highlight:#e0e0e0}@media (prefers-color-scheme:dark){:root{--primary-color:#75d1ae;--secondary-color:#244f3d;--card-bg:#1e1e1e;--board-bg:#1e3b32;--input-bg:#111;--body-bg:#121212;--strong-color:#fff;--reverse-color:#000;--text-color:#e0e0e0;--text-muted:#aaa;--border-color:#333;--border-light:#444;--border-dark:#555;--highlight-color:#b38600;--danger-color:#ef5350;--info-color:#42a5f5;--shadow-light:rgba(0, 0, 0, 0.4);--shadow-strong:rgba(0, 0, 0, 0.6);--skeleton-base:#2a2a2a;--skeleton-highlight:#3a3a3a}}h1,h2,h3,h4,h5,h6{color:var(--primary-color);margin-bottom:1rem;font-weight:400}.h1,h1{font-family:SimSun,"Songti SC",serif;line-height:clamp(1.2rem, .9rem + .3vw, 1.6rem)}h1 .logo{fill:var(--primary-color);width:clamp(100px,6vw + 100px,200px)}h1 .main-title{font-size:clamp(1rem, .9rem + .8vw, 1.5rem);letter-spacing:clamp(.15rem, .2rem + .3vw, .6rem);line-height:1.4em}h1 small{font-size:clamp(.75rem, .7rem + .6vw, 1.1rem);line-height:1.35em}.btn-outline-primary,.btn-outline-secondary{background-color:transparent;transition:.2s}.btn-outline-primary{color:var(--primary-color);border-color:var(--primary-color)}.btn-outline-primary.active,.btn-outline-primary.show,.btn-outline-primary:active,.btn-outline-primary:focus,.btn-outline-primary:hover{color:#fff;background-color:var(--primary-color);border-color:var(--primary-color)}.btn-outline-secondary{color:var(--secondary-color);border-color:var(--secondary-color)}.btn-outline-secondary.active,.btn-outline-secondary.show,.btn-outline-secondary:active,.btn-outline-secondary:focus,.btn-outline-secondary:hover{color:#fff;background-color:var(--secondary-color);border-color:var(--secondary-color)}.btn-primary{background-color:var(--primary-color);border:1px solid var(--primary-color);color:#fff;font-weight:500;border-radius:6px;padding:.4rem 1rem;transition:background-color .2s,border-color .2s}.btn-primary:hover{background-color:#3a75c0;border-color:#3a75c0}.btn-outline-primary.disabled,.btn-outline-primary:disabled{color:var(--text-color)}.form-control{border-radius:6px;border:1px solid var(--border-light);background-color:var(--card-bg);color:var(--text-color);border-color:var(--primary-color);transition:border-color .2s,box-shadow .2s;opacity:.65}.form-control:focus{box-shadow:0 0 0 2px rgba(74,144,226,.2);background-color:var(--input-bg);color:var(--text-color);border-color:var(--primary-color);opacity:1}.nav-tabs{border-bottom-color:var(--primary-color)}.nav-tabs .nav-link{background-color:var(--reverse-color);color:var(--primary-color);font-weight:500;border:1px solid var(--border-color);border-color:var(--secondary-color);border-bottom-color:var(--primary-color);border-radius:.4rem .4rem 0 0;transition:.2s}.nav-tabs .nav-link:focus,.nav-tabs .nav-link:hover{border-color:var(--secondary-color);border-bottom-color:var(--primary-color)}.nav-tabs .nav-link.active{background-color:var(--secondary-color);color:var(--primary-color);border-color:var(--primary-color) var(--primary-color) var(--secondary-color)}.nav-tabs .nav-link.active:focus,.nav-tabs .nav-link.active:hover{border-bottom-color:var(--secondary-color)}.card{background-color:var(--card-bg);border:1px solid var(--border-color);border-radius:0;transition:box-shadow .3s,background-color .3s}.card:hover{box-shadow:0 2px 8px var(--shadow-light)}.card-title{font-size:1.1rem;font-weight:600;margin-bottom:.5rem}.card-text{font-size:.95rem;color:var(--text-muted)}.card-chinese{width:100%;margin:0 auto;padding:1rem;background-color:var(--board-bg);border:18px solid transparent;border-image:url(../images/corner.png) 66 stretch}.card-chinese p{position:relative;color:var(--text-muted);font-size:.875rem}.card-chinese p strong{position:absolute;left:0;display:inline-block;background-color:var(--board-bg);border-radius:3px;line-height:1.3rem;min-width:3.75rem;text-align:center}.card .card-chinese{padding:0;background-color:var(--card-bg)}.pagination-custom .page-link{color:var(--text-color);background-color:var(--card-bg);border:1px solid var(--secondary-color);transition:background-color .2s,color .2s}.pagination-custom .page-link:hover{opacity:.9;border-color:var(--text-muted)}.pagination-custom .active .page-link{background-color:var(--primary-color);color:var(--reverse-color);border-color:var(--text-color)}#pagination button{margin:5px;padding:10px;cursor:pointer;background-color:var(--card-bg);color:var(--text-color);border:1px solid var(--border-light)}#pagination button.active{background-color:var(--secondary-color);color:var(--primary-color)}mark{background-color:var(--highlight-color);padding:0 2px;font-weight:700;color:var(--text-color)}.text-primary{color:var(--info-color)}.text-danger{color:var(--danger-color)}.option{width:100%;min-height:3.5rem;padding:0;display:inline-flex;align-items:center;justify-content:flex-start;border-radius:6px;background:0 0;color:var(--text-color);white-space:normal;word-wrap:break-word;text-align:left;transition:background-color .2s,border-color .2s;border:none}.option:hover{color:var(--strong-color)}#check-toast{min-width:240px;max-width:320px;border:none;border-radius:12px;box-shadow:0 8px 24px var(--shadow-strong);pointer-events:auto;background-color:var(--card-bg);color:var(--text-color)}#toast-body{padding:1rem;font-size:1.05rem;line-height:1.5;font-weight:500}#best-score,#current-score{font-size:1.2rem;font-weight:700}.skeleton-definition,.skeleton-pinyin,.skeleton-title{background:linear-gradient(90deg,var(--skeleton-base) 25%,var(--skeleton-highlight) 50%,var(--skeleton-base) 75%);background-size:200% 100%;animation:1.5s linear infinite skeleton-loading;border-radius:4px}.skeleton-title{width:80px;height:32px}.skeleton-pinyin{width:120px;height:16px}.skeleton-definition{width:100%;height:16px}@keyframes skeleton-loading{0%{background-position:200% 0}100%{background-position:-200% 0}}.loading-state{pointer-events:none;opacity:.75;transition:opacity .2s}.loading-state *{cursor:not-allowed!important}@media (max-width:768px){.card-title{font-size:1rem}.card-text{font-size:.9rem}h1 .main-title{font-size:clamp(1rem, .85rem + .7vw, 1.4rem);letter-spacing:clamp(.15rem, .18rem + .25vw, .55rem)}h1 small{font-size:clamp(.75rem, .65rem + .5vw, 1rem)}}