*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#f4f5f7;--card:#fff;--primary:#0052CC;--primary-hover:#0747A6;--text:#172B4D;--text-light:#6B778C;--border:#DFE1E6;--radius:8px;--shadow:0 1px 3px rgba(0,0,0,.1)}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
#app{max-width:900px;margin:0 auto;padding:20px}
header{text-align:center;margin-bottom:24px;position:relative}
header h1{font-size:1.8rem;color:var(--primary)}
header p{color:var(--text-light);margin-top:4px}
#lang-switcher{position:absolute;top:0;right:0;display:flex;gap:4px}
#lang-switcher button{padding:4px 10px;border:1px solid var(--border);background:var(--card);border-radius:4px;cursor:pointer;font-size:13px}
#lang-switcher button.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin-bottom:20px}
.card h2{font-size:1.2rem;margin-bottom:16px;color:var(--text);border-bottom:2px solid var(--primary);padding-bottom:8px;display:inline-block}
.ratio-presets{margin-bottom:16px}
.ratio-presets label{display:block;font-weight:600;margin-bottom:6px;font-size:14px}
.preset-buttons{display:flex;flex-wrap:wrap;gap:6px}
.preset-buttons button{padding:6px 14px;border:1px solid var(--border);background:var(--card);border-radius:20px;cursor:pointer;font-size:13px;transition:all .15s}
.preset-buttons button:hover,.preset-buttons button:focus{border-color:var(--primary);color:var(--primary)}
.preset-buttons button.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.custom-ratio{display:flex;align-items:center;gap:8px;margin-bottom:16px}
.custom-ratio label{font-weight:600;font-size:14px}
.custom-ratio input{width:70px;padding:6px 10px;border:1px solid var(--border);border-radius:4px;font-size:14px;text-align:center}
.custom-ratio span{font-size:18px;font-weight:700;color:var(--text-light)}
.dimension-inputs{display:flex;align-items:flex-end;gap:12px;margin-bottom:12px}
.dimension-inputs .input-group{flex:1}
.lock-icon{font-size:24px;padding-bottom:6px;cursor:default;user-select:none}
.input-group{display:flex;flex-direction:column;gap:4px}
.input-group label{font-weight:600;font-size:13px;color:var(--text-light)}
.input-group input,input[type=number]{width:100%;padding:8px 12px;border:1px solid var(--border);border-radius:4px;font-size:15px}
input[type=number]:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px rgba(0,82,204,.15)}
.result-info{background:#E3FCEF;border-radius:4px;padding:10px 14px;font-size:14px;color:#006644}
.result-info:empty{display:none}
.preview-container{display:flex;align-items:center;justify-content:center;gap:20px;margin-bottom:16px;flex-wrap:wrap}
.preview-box{display:flex;flex-direction:column;align-items:center;gap:6px}
.preview-box label{font-weight:600;font-size:13px;color:var(--text-light)}
.preview-box canvas{border:2px solid var(--border);border-radius:4px;background:#fafbfc}
.preview-box span{font-size:13px;color:var(--text-light)}
.preview-arrow{font-size:28px;color:var(--primary)}
.original-inputs{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:center}
.original-inputs label{font-weight:600;font-size:13px;color:var(--text-light)}
.original-inputs input{width:100px;padding:6px 10px;border:1px solid var(--border);border-radius:4px;font-size:14px;text-align:center}
.table-wrapper{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:8px 12px;text-align:left;border-bottom:1px solid var(--border)}
th{font-weight:600;color:var(--text-light);font-size:13px;white-space:nowrap}
td button{padding:4px 10px;border:1px solid var(--primary);color:var(--primary);background:transparent;border-radius:4px;cursor:pointer;font-size:12px;white-space:nowrap}
td button:hover{background:var(--primary);color:#fff}
.converter-grid{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end}
.converter-grid .input-group{min-width:120px;flex:1}
.dpi-presets{display:flex;gap:4px;align-items:flex-end;padding-bottom:2px}
.dpi-presets button{padding:6px 10px;border:1px solid var(--border);background:var(--card);border-radius:4px;cursor:pointer;font-size:13px}
.dpi-presets button:hover{border-color:var(--primary);color:var(--primary)}
.conv-results{width:100%;margin-top:8px;background:#EAE6FF;border-radius:4px;padding:10px 14px;font-size:14px;color:#403294}
.conv-results:empty{display:none}
@media(max-width:600px){
  .dimension-inputs{flex-direction:column;align-items:stretch}
  .lock-icon{text-align:center}
  .preview-container{flex-direction:column}
  .preview-arrow{transform:rotate(90deg)}
  header h1{font-size:1.4rem}
  .converter-grid{flex-direction:column}
}