*{margin:0;padding:0;box-sizing:border-box}
:root{--blue:#1a73e8;--blue-hover:#1765cc;--bg:#fff;--bg2:#f8f9fa;--text:#202124;--muted:#5f6368;--border:#dadce0;--green:#34a853;--radius:8px}
body{font-family:Roboto,"Google Sans","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh}
a{color:var(--blue);text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:960px;margin:0 auto;padding:0 16px}
.nav{height:60px;border-bottom:1px solid var(--border);display:flex;align-items:center;background:#fff;position:sticky;top:0;z-index:50}
.nav-inner{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:960px;margin:0 auto;padding:0 16px}
.logo{display:flex;align-items:center;gap:10px}
.logo img{height:26px}
.logo-text{font-size:22px;font-weight:400;color:var(--text)}
.logo-text b{color:var(--blue);font-weight:500}
.nav-right{display:flex;align-items:center;gap:16px;font-size:14px;color:var(--muted)}
.nav-right a:hover{color:var(--blue)}
.main{padding:24px 0 48px}
.translate-box{background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.lang-bar{display:flex;align-items:center;border-bottom:1px solid var(--border);padding:0 8px;min-height:52px;flex-wrap:wrap;gap:4px}
.lang-side{flex:1;display:flex;align-items:center;gap:4px;min-width:140px;padding:8px}
.lang-side select{border:none;background:transparent;font-size:14px;font-weight:500;color:var(--blue);padding:8px 4px;cursor:pointer;outline:none;max-width:160px}
.swap-btn{width:40px;height:40px;border:none;background:transparent;border-radius:50%;cursor:pointer;font-size:18px;color:var(--muted);display:flex;align-items:center;justify-content:center}
.swap-btn:hover{background:var(--bg2);color:var(--blue)}
.text-area-wrap{display:grid;grid-template-columns:1fr 1fr;min-height:220px}
.text-panel{padding:16px;position:relative;display:flex;flex-direction:column}
.text-panel+.text-panel{border-left:1px solid var(--border);background:#fafafa}
.text-panel textarea{flex:1;width:100%;border:none;resize:none;font-size:18px;line-height:1.5;outline:none;background:transparent;color:var(--text);font-family:inherit;min-height:160px}
.text-panel textarea::placeholder{color:#9aa0a6}
.result-text{flex:1;font-size:18px;line-height:1.5;color:var(--text);min-height:160px;white-space:pre-wrap;word-break:break-word}
.panel-footer{display:flex;align-items:center;justify-content:space-between;margin-top:8px;min-height:36px}
.char-count{font-size:12px;color:var(--muted)}
.action-btns{display:flex;gap:8px}
.icon-btn{width:36px;height:36px;border:none;background:transparent;border-radius:50%;cursor:pointer;font-size:16px;color:var(--muted);display:flex;align-items:center;justify-content:center}
.icon-btn:hover{background:var(--bg2);color:var(--blue)}
.translate-actions{padding:12px 16px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;background:#fff}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;border-radius:4px;font-size:14px;font-weight:500;border:none;cursor:pointer;transition:.15s}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-hover);box-shadow:0 1px 2px rgba(0,0,0,.2)}
.btn-primary:disabled{opacity:.6;cursor:not-allowed}
.btn-text{background:transparent;color:var(--blue);padding:8px 12px}
.btn-text:hover{background:#e8f0fe}
.status{font-size:13px;color:var(--muted)}
.status.loading{color:var(--blue)}
.status.error{color:#d93025}
.features{padding:48px 0;background:var(--bg2);margin-top:40px}
.features h2{text-align:center;font-size:24px;font-weight:400;margin-bottom:8px}
.features .sub{text-align:center;color:var(--muted);margin-bottom:32px;font-size:15px}
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center}
.feat-icon{font-size:28px;margin-bottom:10px}
.feat h3{font-size:15px;font-weight:500;margin-bottom:6px}
.feat p{font-size:13px;color:var(--muted)}
.footer{padding:32px 0;border-top:1px solid var(--border);margin-top:0;text-align:center;font-size:13px;color:var(--muted)}
.footer a{color:var(--muted)}
.footer a:hover{color:var(--blue)}
.lang-chips{display:flex;flex-wrap:wrap;gap:6px;padding:8px 0}
.lang-chip{padding:4px 12px;border-radius:16px;font-size:12px;border:1px solid var(--border);cursor:pointer;color:var(--muted);background:#fff}
.lang-chip:hover,.lang-chip.active{border-color:var(--blue);color:var(--blue);background:#e8f0fe}
@media(max-width:700px){
.text-area-wrap{grid-template-columns:1fr}
.text-panel+.text-panel{border-left:none;border-top:1px solid var(--border)}
.feat-grid{grid-template-columns:1fr}
.lang-bar{flex-direction:column;align-items:stretch}
.lang-side{min-width:100%}
}