:root{--primary:#3b82f6;--primary-light:#60a5fa;--success:#10b981;--info:#374151;--warning:#f59e0b;--error:#ef4444;--bg-color:#f8fafc}
*{margin:0;padding:0;box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
body,html{height:100%;min-height:100vh;width:100%;overflow-x:hidden;position:relative}
body{background-color:var(--bg-color);color:var(--info);line-height:1.6;padding:0;display:flex;flex-direction:column;justify-content:center;align-items:center}
.fullscreen-content{width:100%;max-width:600px;padding:0 20px;text-align:center;position:relative}
header{margin-bottom:40px}
.title{font-size:3rem;font-weight:700;color:var(--primary);margin-bottom:15px;line-height:1.2}
.tagline{font-size:1.2rem;opacity:.8;margin-bottom:10px}
form{width:100%;margin-bottom:30px}
.form-group{margin-bottom:25px;width:100%}
.form-control{width:100%;height:60px;padding:0 20px;border:2px solid var(--primary-light);border-radius:8px;font-size:1.1rem;transition:all .3s ease;background:rgba(255,255,255,.9)}
.form-control:focus{border-color:var(--primary);outline:0;box-shadow:0 0 15px rgba(59,130,246,.2)}
.btn{width:100%;height:60px;background:var(--primary);color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:1.1rem;font-weight:600;display:flex;align-items:center;justify-content:center;gap:10px;transition:all .3s ease}
.btn:hover:not(:disabled){background:var(--primary-light);transform:translateY(-2px);box-shadow:0 8px 15px rgba(59,130,246,.2)}
.btn:active:not(:disabled){transform:translateY(0)}
.btn:disabled{background:#cbd5e1;cursor:not-allowed}
.result-container{margin-top:30px;width:100%;animation:fadeIn .5s ease-out}
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}
to{opacity:1;transform:translateY(0)}
}
.result-text{font-size:1.2rem;padding:20px;border-radius:8px;font-weight:500}
.success{color:var(--success);background:rgba(16,185,129,.1);border:1px solid var(--success)}
.info{color:var(--info);background:rgba(107,114,128,.1);border:1px solid var(--info)}
.warning{color:var(--warning);background:rgba(245,158,11,.1);border:1px solid var(--warning)}
.error{color:var(--error);background:rgba(239,68,68,.1);border:1px solid var(--error)}
footer{margin-top:60px;color:var(--info);font-size:.9rem;opacity:.7;padding:20px 0;width:100%}
/* 平板设备优化 */
@media (max-width:768px){
    .fullscreen-content{padding:0 15px;max-width:100%}
    .title{font-size:2.5rem;margin-bottom:12px}
    .tagline{font-size:1.1rem;margin-bottom:8px}
    .btn,.form-control{height:55px;font-size:1rem}
    .result-text{font-size:1.1rem;padding:15px}
    header{margin-bottom:35px}
    form{margin-bottom:25px}
    .form-group{margin-bottom:20px}
}

/* 手机设备优化 */
@media (max-width:480px){
    body{padding:10px 0;min-height:calc(100vh - 20px)}
    .fullscreen-content{padding:0 12px;max-width:100%}
    .title{font-size:2rem;margin-bottom:10px;line-height:1.1}
    .tagline{font-size:1rem;margin-bottom:6px;opacity:.9}
    .btn,.form-control{height:50px;font-size:.95rem;border-radius:6px}
    .form-control{padding:0 15px}
    .result-text{font-size:1rem;padding:12px;border-radius:6px}
    header{margin-bottom:25px}
    form{margin-bottom:20px}
    .form-group{margin-bottom:18px}
    .btn:hover:not(:disabled){transform:none;box-shadow:0 4px 8px rgba(59,130,246,.15)}
}

/* 小屏手机优化 */
@media (max-width:360px){
    .fullscreen-content{padding:0 10px}
    .title{font-size:1.8rem}
    .tagline{font-size:.9rem}
    .btn,.form-control{height:48px;font-size:.9rem}
    .form-control{padding:0 12px}
    .result-text{font-size:.95rem;padding:10px}
    header{margin-bottom:20px}
    form{margin-bottom:18px}
    .form-group{margin-bottom:15px}
}

/* 防止水平滚动 */
@media (max-width:1000px){
    body,html{overflow-x:hidden}
    *{max-width:100%}
}

/* 触摸设备优化 */
@media (hover:none) and (pointer:coarse){
    .btn:hover:not(:disabled){transform:none;background:var(--primary)}
    .btn:active:not(:disabled){transform:scale(.98);background:var(--primary-light)}
    .form-control:focus{border-color:var(--primary);box-shadow:0 0 10px rgba(59,130,246,.15)}
}