:root {
    --primary: #4F8CFF;
    --primary-light: #E8F0FE;
    --primary-dark: #3A6FD8;
    --accent: #FF6B6B;
    --bg: #F5F6FA;
    --card-bg: #FFFFFF;
    --text-primary: #1A1D28;
    --text-secondary: #6B7280;
    --text-hint: #9CA3AF;
    --border: #EEF0F5;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 999px;
    --safe-bottom: env(safe-area-inset-bottom,16px);
}
*{margin:0;padding:0;-webkit-tap-highlight-color: transparent;box-sizing:border-box}
body{
    font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
    background-color:var(--bg);color:var(--text-primary);line-height:1.5;
    -webkit-font-smoothing:antialiased;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;
}
.login-container{
    width:100%;max-width:380px;background:var(--card-bg);border-radius:var(--radius-lg);
    padding:32px 24px 28px;box-shadow:var(--shadow-md);animation:fadeInUp 0.4s ease;
}
.login-header{text-align:center;margin-bottom:28px}
.login-logo{font-size:28px;font-weight:700;display:flex;align-items:center;justify-content:center;gap:6px;margin-bottom:6px}
.login-subtitle{font-size:14px;color:var(--text-hint)}
.form-group{margin-bottom:18px}
.form-label{font-size:13px;font-weight:500;color:var(--text-secondary);margin-bottom:6px;display:block}
.form-input{
    width:100%;padding:13px 14px;border:1.5px solid var(--border);border-radius:var(--radius-md);
    font-size:15px;background:#fafafa;outline:none;transition:border 0.2s,background 0.2s;
}
.form-input:focus{border-color:var(--primary);background:#fff}
.btn-login{
    width:100%;padding:14px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-full);
    font-size:16px;font-weight:600;cursor:pointer;transition:background 0.2s;margin-top:8px;letter-spacing:0.5px;
}
.btn-login:active{background:var(--primary-dark)}
.btn-login:disabled{background:#b0c9ff;cursor:not-allowed}
.error-msg{font-size:13px;color:var(--accent);margin-top:10px;text-align:center;min-height:20px}
.footer-note{text-align:center;font-size:12px;color:var(--text-hint);margin-top:20px}
@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}