*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:#0f0f23;color:#e0e0e0;min-height:100vh}
#app{max-width:480px;margin:0 auto;padding:20px;min-height:100vh}
header{display:flex;justify-content:space-between;align-items:center;padding:12px 0 24px}
.logo{font-size:22px;font-weight:700;background:linear-gradient(135deg,#e94560,#ff6b6b);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.lang-btn{background:#1a1a2e;color:#e94560;border:1px solid #e94560;padding:6px 14px;border-radius:20px;cursor:pointer;font-size:13px}
.page{display:none;flex-direction:column;gap:20px}
.page.active{display:flex}
h1{font-size:28px;line-height:1.3;margin-bottom:8px}
h2{font-size:22px;margin-bottom:12px}
.features{display:flex;flex-direction:column;gap:14px;padding:10px 0}
.feature{display:flex;align-items:center;gap:12px;font-size:15px;color:#aaa}
.feature .icon{font-size:20px}
.btn-primary{background:#e94560;color:#fff;border:none;padding:14px 28px;border-radius:12px;font-size:16px;cursor:pointer;font-weight:600;margin-top:8px;transition:.3s}
.btn-primary:hover{background:#ff6b6b;transform:translateY(-1px)}
.disclaimer{font-size:11px;color:#666;text-align:center;margin-top:12px}
form{display:flex;flex-direction:column;gap:14px}
label{font-size:14px;color:#aaa;margin-bottom:-6px}
select,input,textarea{background:#1a1a2e;color:#e0e0e0;border:1px solid #333;padding:12px;border-radius:10px;font-size:15px;font-family:inherit}
textarea{resize:vertical;min-height:80px}
select:focus,input:focus,textarea:focus{outline:none;border-color:#e94560}
.spinner{width:40px;height:40px;border:4px solid #333;border-top-color:#e94560;border-radius:50%;animation:spin .8s linear infinite;margin:40px auto}
@keyframes spin{to{transform:rotate(360deg)}}
#loading{text-align:center;padding:60px 0}
#loading p{margin-top:16px;color:#888}
#resultContent{background:#1a1a2e;padding:20px;border-radius:12px;line-height:1.8;font-size:15px;white-space:pre-wrap}
@media(prefers-color-scheme:light){body{background:#f5f5f5;color:#333}#resultContent,select,input,textarea{background:#fff;border-color:#ddd}}
/* Chinese font support */
[lang="zh"] body{font-family:'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif}